
From nobody Sat Nov  1 09:01:33 2014
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Date: Sat, 01 Nov 2014 17:01:25 +0100
From: Huub van Helvoort <huubatwork@gmail.com>
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Subject: Re: [mpls] Fwd: New Version Notification for draft-kompella-mpls-rmr-00.txt
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Hello Kireeti,

I also did a careful reading of this draft.

I agree with Greg that the failure of a node is not covered.

I also notice that you did not cover that a second failure
(link/node) that splits the ring in two islands.
In this case the protection in effect in each of the islands
should be maintained. You may have the same issue as detected
by Greg for a single node failure.

I also notice that during the process of changing DS to US
at each node MPLS packets may get lost or get out of order.
Is my interpretation correct?

Cheers, Huub.


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From nobody Sat Nov  1 20:40:01 2014
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: Kireeti Kompella <kireeti.kompella@gmail.com>
Thread-Topic: [mpls] New Version Notification for draft-kompella-mpls-rmr-00.txt
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: Gregory Mirsky <gregory.mirsky@ericsson.com>, Kireeti Kompella <kireeti.kompella@gmail.com>
Thread-Topic: [mpls] New Version Notification for draft-kompella-mpls-rmr-00.txt
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From nobody Sun Nov  2 05:27:27 2014
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Date: Sun, 02 Nov 2014 14:27:19 +0100
From: Huub van Helvoort <huubatwork@gmail.com>
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Subject: Re: [mpls] New Version Notification for draft-kompella-mpls-rmr-00.txt
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Hello Sasha,

You reply:

> A couple of general comments if you do not mind.

Thank you for your valuable comments.

See in-line [HH] for some answers.

>  1. Fast handling of node failures is usually much more complicated than
>     fast handling link failures, probably because it is not trivial for
>     the nodes adjacent to the failure to distinguish between the two.

[HH] if a node fails I expect that the links to the adjacent nodes fail
      too. If this protocol can handle two link failures, there is no
      need to distinguish between link and node failure.

>  2. Ring topologies are special not just because they are the simplest
>     topologies providing some level of resilience, but also because
>     distinguishing between link and node failures is relatively simple
>     even if it involves signaling.  BLSR (or its ITU-T equivalent
>     MSP-Ring) uses this ability, and it has been inherited by the
>     MPLS-TP mechanisms for ring protection. To me this means that
>     enhancing Kireeti's original proposal with some signaling that would
>     effectively protect against node failure should not be complicated.

[HH] (the correct ITU-T term is MS-SPRing), see my comment regarding
      node failure above. MS-SPRing signals only link failures. The APS
      protocol covers the node failure.

>  3. I am not sure we need a new extended reserved label for this
>     signaling. Existing mechanisms for trapping the labeled packets
>     (GAL, TTL expiration) should suffice IMO.

[HH] a new extended label will also increase the size of every packet
      that is ring protected. Note that there will also be unprotected
      traffic on the ring.

>  4. Protection against a double failure that results in a ring being
>     partitioned in two disjoint islands is IMO of less interest, not in
>     the least because some traffic would not be restored in any case.

[HH] the island could be a single node, see my comment under 1.
      Traffic that was already switched due to the first failure should
      not be switched again due to the second failure, in the current
      draft I cannot find how that is addressed.

>  5. Last but not least, I think that Greg has hit an important weak
>     point of all ring topologies when he has mentioned that nodes can be
>     inserted into/removed from the ring. Such an operation typically
>     requires renumbering of the nodes forming a ring.

[HH] IMHO renumbering is not required, the ring maps in each node have
      to be updated with the new adjacency of the nodes.

>     In SONET/SDH operations require intervention of the network
>     management system, and I suspect that this is also true for
>     MPLS-TP rings. Identifying a solution for node insertion/removal
>     that does not depend on management intervention and does not create
>     additional traffic hits (beyond one that has been caused
>     by disconnection of fibers required for node insertion/removal)
>     looks like an important and challenging problem to me. If it could
>     be solved, IMO this would give a real advantage to Kireeti's proposal.

[HH] adding/deleting a node from a ring should be performed only when
      there are no faults on the ring, the management has to update the
      ring-maps in each ring node. MS-SPRing uses a forced switch to move
      the traffic away from the link that is opened to insert a new node
      or away from the node that is removed. After the ring-maps are
      updated, the forced switch is cleared. The activation and clearing
      of the forced switch will have minimal hits on the traffic.

Best regards, Huub.



-- 
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "huubatwork@gmail.com" <huubatwork@gmail.com>
Thread-Topic: [mpls] New Version Notification for draft-kompella-mpls-rmr-00.txt
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Date: Sun, 2 Nov 2014 13:51:42 +0000
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Subject: Re: [mpls] New Version Notification for draft-kompella-mpls-rmr-00.txt
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On Sunday, November 02, 2014 09:02:18 AM Alexander=20
Vainshtein wrote:

> 5.  Last but not least, I
> think that Greg has hit an important weak point of all
> ring topologies when he has mentioned that nodes can be
> inserted into/removed from the ring. Such an operation
> typically requires renumbering of the nodes forming a
> ring. In SONET/DH operations require intervention of the
> network management system, and I suspect that this is
> also true for MPLS-TP rings. Identifying a solution for
> node insertion/removal that does not depend on
> management intervention and does not create additional
> traffic hits (beyond one that has been caused by
> disconnection of fibers required for node
> insertion/removal) looks like an important and
> challenging problem to me. If it could be solved, IMO
> this would give a real advantage to Kireeti's proposal.

I'm aware of active work in this regard taking place at one=20
of the vendors.

I hope any success in this area will be open standard.

Mark.

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From nobody Sun Nov  2 13:47:56 2014
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Date: Sun, 02 Nov 2014 16:47:50 -0500
From: Phil Bedard <bedard.phil@gmail.com>
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On 11/2/14, 5:35 PM, "Mark Tinka" <mark.tinka@seacom.mu> wrote:

>On Sunday, November 02, 2014 09:02:18 AM Alexander 
>Vainshtein wrote:
>
>> 5.  Last but not least, I
>> think that Greg has hit an important weak point of all
>> ring topologies when he has mentioned that nodes can be
>> inserted into/removed from the ring. Such an operation
>> typically requires renumbering of the nodes forming a
>> ring. In SONET/DH operations require intervention of the
>> network management system, and I suspect that this is
>> also true for MPLS-TP rings. Identifying a solution for
>> node insertion/removal that does not depend on
>> management intervention and does not create additional
>> traffic hits (beyond one that has been caused by
>> disconnection of fibers required for node
>> insertion/removal) looks like an important and
>> challenging problem to me. If it could be solved, IMO
>> this would give a real advantage to Kireeti's proposal.
>
>I'm aware of active work in this regard taking place at one 
>of the vendors.
>
>I hope any success in this area will be open standard.
>
>Mark.


There is some difficulty because address assignment happens at a layer 
below protocols like LDP/RSVP.  One solution is to use unnumbered 
interfaces which has been used for some time in various protocols but it 
can add some operational difficulties, at least perceived.  Never caught 
on for various reasons.   The other is use a protocol below IP to 
negotiate IP addresses.  If we are thinking of the same vendor they use 
proprietary extensions to LLDP (802.3ab) to negotiate the owner of the 
link and the non-owner.  The non-owner is assigned an IP address one lower 
than the owner, which works for either a /30 or a /31.  

What I'd rather see is have all this working over IPv6 where you simply 
use link-local addresses which offer a dynamic mechanism for address 
assignment.   

As for the draft I do see some benefit in it as we deploy MPLS access 
rings.  They require a lot of state in the rings today which is completely 
unnecessary including link detours or FRR paths.  

Phil 


From nobody Sun Nov  2 19:42:47 2014
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From: Ross Callon <rcallon@juniper.net>
To: "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] IPR poll for draft-chen-mpls-source-label
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Cc: "draft-chen-mpls-source-label@tools.ietf.org" <draft-chen-mpls-source-label@tools.ietf.org>, "mpls-chairs@tools.ietf.org" <mpls-chairs@tools.ietf.org>
Subject: Re: [mpls] IPR poll for draft-chen-mpls-source-label
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Working group:

There has been an extensive discussion, particularly over the past couple o=
f weeks, on the source label draft, and whether source labels are an approp=
riate and needed update to the MPLS architecture. It is clear that at the c=
urrent time there is no consensus to consider draft-chen-mpls-source-label =
for adoption as an MPLS WG draft.

We welcome continued discussion of requirements and use cases, as well as m=
ethods to satisfy these requirements.

Thanks, Ross
(as MPLS WG co-chair)

-----Original Message-----
From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Ross Callon
Sent: Thursday, October 16, 2014 3:25 PM
To: mpls@ietf.org
Cc: draft-chen-mpls-source-label@tools.ietf.org; mpls-chairs@tools.ietf.org
Subject: Re: [mpls] IPR poll for draft-chen-mpls-source-label

MPLS working group;

There have been a number of comments, both public and private, about whethe=
r or not source labels are needed and/or worth the cost of implementing thi=
s approach. It is clear that we need a discussion in public on the MPLS ema=
il list of this issue. In principle this discussion could occur either befo=
re or as part of the call for adoption. However, due to the strong interest=
 of several folks to focus on this issue, and the possibility that the outc=
ome of this discussion might motivate changes to the document, I think that=
 we should have this discussion prior to the call for adoption.

I would like to therefore encourage MPLS participants to reply to Stewart's=
 email (and the few replies that have already occurred) and to continue thi=
s discussion. The requirements and use cases for source labels, whether sou=
rce labels are needed, what the cost of implementation would be, and altern=
atives to satisfy the same use cases, are all explicitly topics that should=
 be considered (as well as any other issues that people feel is important i=
n determining whether the MPLS WG should work on source labels).

In the hope of coming to a timely consensus, I would encourage people who h=
ave opinions on this issue to respond within two weeks (by Friday October 3=
1).

Thanks, Ross


From nobody Sun Nov  2 22:42:38 2014
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From: Sriganesh Kini <sriganesh.kini@ericsson.com>
Date: Sun, 2 Nov 2014 22:42:02 -0800
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Subject: Re: [mpls] New Version Notification for draft-kompella-mpls-rmr-00.txt
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Hi all,

Would like to point to a proposal several years ago, that sent a
notification to the upstream nodes (to remove the wraparound traffic).
http://www.ietf.org/archive/id/draft-kini-mpls-ring-frr-facility-backup-02.=
txt

http://tools.ietf.org/html/draft-kini-mpls-fast-lsp-alert-02

In order to convey the notification rapidly, signaling protocols were not
used.
A combination of TTL expiry and the G-Ach was used (GAL TTL was used to
prevent looping of packets). It also used a BFD session to convey whether
the PLR has done the protection switch so that the upstream nodes can do
the switchover of the traffic and remove the wraparound. There may be
better alternatives than using BFD.

Sri


On Sun, Nov 2, 2014 at 12:02 AM, Alexander Vainshtein <
Alexander.Vainshtein@ecitele.com> wrote:

>  =E2=80=8B=E2=80=8BGreg, Kireeti and all,
>
> A couple of general comments if you do not mind.
>
>
>
>    1. Fast handling of node failures is usually much more complicated
>    than fast handling link failures, probably because it is not trivial f=
or
>    the nodes adjacent to the failure to distinguish between the two.
>    2. Ring topologies are special not just because they are the simplest
>    topologies providing some level of resilience, but also because
>    distinguishing between link and node failures is relatively simple eve=
n if
>    it involves signaling.  BLSR (or its ITU-T equivalent MSP-Ring) uses t=
his
>    ability, and it has been inherited by the MPLS-TP mechanisms for ring
>    protection. To me this means that enhancing Kireeti's original proposa=
l
>    with some signaling that would effectively protect against node failur=
e
>    should not be complicated.
>    3. I am not sure we need a new extended reserved label for this
>    signaling. Existing mechanisms for trapping the labeled packets (GAL, =
TTL
>    expiration) should suffice IMO.
>    4. Protection against a double failure that results in a ring being
>    partitioned in two disjoint islands is IMO of less interest, not in th=
e
>    least because some traffic would not be restored in any case.
>    5. Last but not least, I think that Greg has hit an important weak
>    point of all ring topologies when he has mentioned that nodes can be
>    inserted into/removed from the ring. Such an operation typically requi=
res
>    renumbering of the nodes forming a ring. In SONET/DH operations
>    require intervention of the network management system, and I suspect t=
hat
>    this is also true for MPLS-TP rings. Identifying a solution for node
>    insertion/removal that does not depend on management intervention and =
does
>    not create additional traffic hits (beyond one that has been caused
>    by disconnection of fibers required for node insertion/removal) looks =
like
>    an important and challenging problem to me. If it could be solved, IMO=
 this
>    would give a real advantage to Kireeti's proposal.
>
>
>  My 2c,
>
> Sasha
>  ------------------------------
>
>
>  *From:* mpls <mpls-bounces@ietf.org> on behalf of Gregory Mirsky <
> gregory.mirsky@ericsson.com>
> *Sent:* Sunday, November 2, 2014 5:39 AM
> *To:* Kireeti Kompella
> *Cc:* mpls@ietf.org
>
> *Subject:* Re: [mpls] New Version Notification for
> draft-kompella-mpls-rmr-00.txt
>
>
> Hi Kireeti,
>
> thank you for your kind consideration, much appreciated.
>
> Of course, TTL will break the loop and setting it to precise value may be
> one solution. But, as Huub pointed, if ring experienced double failure lo=
op
> still exist though less severe. And since nodes may be added and removed
> from the ring dynamically every node must be aware of number of nodes in
> that ring.
>
> Thus I personally prefer option #3, (Extended) Special Purpose Label (tha=
t
> we can name later). The possible drawback, as with any new (E)SPL cases, =
is
> that it becomes new capability that now must be advertised as such.
>
> But I agree, let=E2=80=99s list all three options as these are sound tech=
nical
> solutions to the realistic scenario and any of TTL based may be used by
> itself or in combination with (E)SPL. (E)SPL may be used only if ring is
> homogeneous in regard to this capability.
>
>
>
>                 Regards,
>
>                                 Greg
>
>
>
> *From:* Kireeti Kompella [mailto:kireeti.kompella@gmail.com]
> *Sent:* Friday, October 31, 2014 6:37 PM
> *To:* Gregory Mirsky
> *Cc:* Kireeti Kompella; mpls@ietf.org
> *Subject:* Re: [mpls] New Version Notification for
> draft-kompella-mpls-rmr-00.txt
>
>
>
> Hi Greg,
>
>
>
> On Oct 30, 2014, at 16:21 , Gregory Mirsky <gregory.mirsky@ericsson.com>
> wrote:
>
>
>
>  Hi Kireeti,
>
> I think that proposed in this document protection method creates some
> unpleasant scenario if failure is of a node, not a link. If I use the
> scenario presented in Section 3.6 but assume that the failure is not of t=
he
> link between R_j and R_j+1 but of the node Rj+1. Thus, as R_j switches to
> US direction, the R_j+2 will switch to DS. And until notifications from R=
_j
> and R_j+2 reach R_j+2 and R_j respectively we have routing loop on RL_j+1
> LSP.
>
>
>
> I appreciate your careful reading!  Note of course that since there is a
> TTL, this is a finite loop (not saying it isn=E2=80=99t bad, but that thi=
s has the
> germ of the solution.)
>
>
>
> I have three solutions for this problem. I didn=E2=80=99t put them in the=
 first
> version of the draft; I may eventually document all (and others, as the W=
G
> chimes in), but meanwhile this discussion is perfect.
>
>
>
> My preferred solution is to always insert packets on a ring LSP with TTL =
=3D
> 2N-1 if the ring has N nodes.  This is enough for the worst case =E2=80=
=94 node R_j
> sends a packet on RL_j+1 the =E2=80=9Clong=E2=80=9D way around, only to e=
ncounter a failure
> at node R_j+2, and come all the way back to R_j, then R_j+1.
>
>
>
> Another solution is that an ingress node sets the TTL as usual, but a PLR
> sets the TTL to the smaller of the current TTL-1 and the minimum TTL
> required to reach the egress.    So, in the above example, R_j would set
> TTL as usual, but R_j+2, on detecting a failure, would set TTL =3D N-1 an=
d
> send it the other way.  In this case, when the packet gets back to R_j, i=
t
> should not in turn reset the TTL to N-1.  Of course, both of the above ca=
n
> be combined.
>
>
>
> Finally, a PLR (R_j+2) can push a special purpose label to indicate that
> this is a failure path, then push the label to go the other way.  If the
> packet goes back to R_j, before R_j sends it the other way, it sees that
> the label below the top of stack is this failure label, and drops the
> packet rather than cycle it back around the ring.
>
>
>
>  If my assumptions are correct, then notification mechanism MUST be
> reliable or be backed up by IGP signaling. In any case, the loop may
> persist for quite a while and affect all services.
>
>
>
> Agreed, having a reliable notification mechanism is always a good thing.
>
>
>
>  Comments, questions are always welcome and greatly appreciated.
>
>
>
> Greg, since you worked out the problem, do you have any opinions on the
> solutions above, or any of your own?
>
>
>
> Cheers,
>
> Kireeti.
>
>
>
>                  Regards,
>
>                                 Greg
>
>
>
> *From:* mpls [mailto:mpls-bounces@ietf.org <mpls-bounces@ietf.org>] *On
> Behalf Of *Kireeti Kompella
> *Sent:* Wednesday, October 29, 2014 10:41 AM
> *To:* mpls@ietf.org
> *Subject:* [mpls] Fwd: New Version Notification for
> draft-kompella-mpls-rmr-00.txt
>
>
>
> Hi Folks,
>
>
>
> This is a draft on making MPLS more efficient in ring networks.  I have
> come around to understanding that:
>
> a) rings are a special topology (there was a time that I didn't appreciat=
e
> that);
>
> b) MPLS is pretty inefficient in rings (that is/was quite obvious).
>
>
>
> This draft attempts to fix that, both by making protection much more
> efficient, and by making configuration much easier.
>
>
>
> Your comments are highly welcome!
>
>
>
> Cheers,
>
> Kireeti.
>
>
>
> ---------- Forwarded message ----------
> From: <internet-drafts@ietf.org>
> Date: Sun, Oct 26, 2014 at 9:15 PM
> Subject: New Version Notification for draft-kompella-mpls-rmr-00.txt
> To: Kireeti Kompella <kireeti.kompella@gmail.com>
>
>
>
> A new version of I-D, draft-kompella-mpls-rmr-00.txt
> has been successfully submitted by Kireeti Kompella and posted to the
> IETF repository.
>
> Name:           draft-kompella-mpls-rmr
> Revision:       00
> Title:          Resilient MPLS Rings
> Document date:  2014-10-26
> Group:          Individual Submission
> Pages:          7
> URL:
> http://www.ietf.org/internet-drafts/draft-kompella-mpls-rmr-00.txt
> Status:         https://datatracker.ietf.org/doc/draft-kompella-mpls-rmr/
> Htmlized:       http://tools.ietf.org/html/draft-kompella-mpls-rmr-00
>
>
> Abstract:
>    This document describes the use of the MPLS control and data planes
>    on ring topologies.  It describes the special nature of rings, and
>    proceeds to show how MPLS can be effectively used in such topologies.
>    It describes how MPLS rings are configured, auto-discovered and
>    signaled, as well as how the data plane works.  Companion documents
>    describe the details of discovery and signaling for specific
>    protocols.
>
>
>
>
>
> Please note that it may take a couple of minutes from the time of
> submission
> until the htmlized version and diff are available at tools.ietf.org.
>
> The IETF Secretariat
>
>
>
>
>
> --
> Kireeti
>
>
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>
>

--089e0158c8dab680c20506eea623
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi all,<div><br></div><div>Would like to point to a propos=
al several years ago, that sent a notification to the upstream nodes (to re=
move the wraparound traffic).</div><div><a href=3D"http://www.ietf.org/arch=
ive/id/draft-kini-mpls-ring-frr-facility-backup-02.txt" target=3D"_blank">h=
ttp://www.ietf.org/archive/id/draft-kini-mpls-ring-frr-facility-backup-02.t=
xt</a>=C2=A0</div><div><a href=3D"http://tools.ietf.org/html/draft-kini-mpl=
s-fast-lsp-alert-02" target=3D"_blank">http://tools.ietf.org/html/draft-kin=
i-mpls-fast-lsp-alert-02</a><br></div><div><br></div><div>In order to conve=
y the notification rapidly, signaling protocols were not used.=C2=A0</div><=
div>A combination of TTL expiry and the G-Ach was used (GAL TTL was used to=
 prevent looping of packets). It also used a BFD session to convey whether =
the PLR has done the protection switch so that the upstream nodes can do th=
e switchover of the traffic and remove the wraparound. There may be better =
alternatives than using BFD.</div><div><br></div><div>Sri</div><div><br></d=
iv><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Sun, Nov 2,=
 2014 at 12:02 AM, Alexander Vainshtein <span dir=3D"ltr">&lt;<a href=3D"ma=
ilto:Alexander.Vainshtein@ecitele.com" target=3D"_blank">Alexander.Vainshte=
in@ecitele.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">




<div dir=3D"ltr" style=3D"font-size:12pt;color:#000000;background-color:#ff=
ffff;font-family:&#39;Times New Roman&#39;,Times,serif">
<p>=E2=80=8B=E2=80=8BGreg, Kireeti and all,</p>
<p>A couple of general comments if you do not mind.</p>
<p><br>
</p>
<ol>
<li>Fast handling of node failures is=C2=A0usually much more complicated th=
an fast handling link failures, probably because it is not trivial for the =
nodes adjacent to the failure to distinguish between the two.=C2=A0</li><li=
>Ring topologies are special not just because they are the simplest topolog=
ies providing some level of resilience, but also because distinguishing bet=
ween link and node failures is relatively simple even if it involves signal=
ing.=C2=A0=C2=A0BLSR (or its ITU-T equivalent
 MSP-Ring) uses this ability, and it has been inherited by the MPLS-TP mech=
anisms for ring protection. To me this means that enhancing Kireeti&#39;s o=
riginal proposal with some signaling that would effectively protect against=
 node failure should not be complicated.</li><li>I am not sure we need a ne=
w extended reserved label for this signaling.=C2=A0Existing mechanisms for =
trapping the labeled packets (GAL, TTL expiration) should suffice IMO.=C2=
=A0=C2=A0=C2=A0</li><li>Protection against a double failure that results in=
 a ring being partitioned in two disjoint islands is IMO of less interest, =
not in the least because some traffic would not be restored in any case.
</li><li>Last but not least, I think that Greg has hit an important weak po=
int of all ring=C2=A0topologies when he has mentioned that nodes can be ins=
erted into/removed from the ring.=C2=A0Such an operation typically requires=
 renumbering of the nodes forming a ring.=C2=A0In=C2=A0SONET/DH=C2=A0operat=
ions
 require=C2=A0intervention of=C2=A0the network management system, and I sus=
pect that this is also true for MPLS-TP=C2=A0rings.=C2=A0Identifying=C2=A0a=
 solution for node insertion/removal that=C2=A0does not depend on managemen=
t intervention and=C2=A0does not=C2=A0create additional traffic hits (beyon=
d
 one that has been caused by=C2=A0disconnection of fibers required for node=
 insertion/removal) looks like an important and=C2=A0challenging=C2=A0probl=
em to me. If it could be solved, IMO this would=C2=A0give a real advantage =
to Kireeti&#39;s proposal.=C2=A0=C2=A0</li></ol>
<p><br>
</p>
<p>My 2c,</p>
<p>Sasha</p>
<div style=3D"color:rgb(33,33,33)"></div>
<div style=3D"color:rgb(33,33,33)">
<hr style=3D"width:98%;display:inline-block">
</div>
<div style=3D"color:rgb(33,33,33)"></div>
<div style=3D"color:rgb(33,33,33)" dir=3D"ltr"><font color=3D"#000000" face=
=3D"Calibri, sans-serif" style=3D"font-size:11pt"><b><br>
</b></font></div>
<div style=3D"color:rgb(33,33,33)" dir=3D"ltr"><font color=3D"#000000" face=
=3D"Calibri, sans-serif" style=3D"font-size:11pt"><b><br>
</b></font></div>
<div style=3D"color:rgb(33,33,33)" dir=3D"ltr"><font color=3D"#000000" face=
=3D"Calibri, sans-serif" style=3D"font-size:11pt"><b>From:</b> mpls &lt;<a =
href=3D"mailto:mpls-bounces@ietf.org" target=3D"_blank">mpls-bounces@ietf.o=
rg</a>&gt; on behalf of Gregory Mirsky &lt;<a href=3D"mailto:gregory.mirsky=
@ericsson.com" target=3D"_blank">gregory.mirsky@ericsson.com</a>&gt;<br>
<b>Sent:</b> Sunday, November 2, 2014 5:39 AM<br>
<b>To:</b> Kireeti Kompella<br>
<b>Cc:</b> <a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org=
</a><div><div><br>
<b>Subject:</b> Re: [mpls] New Version Notification for draft-kompella-mpls=
-rmr-00.txt</div></div></font>
</div><div><div>
<div style=3D"color:rgb(33,33,33)" dir=3D"ltr">=C2=A0</div>
<div style=3D"color:rgb(33,33,33)" dir=3D"ltr"></div>
<div style=3D"color:rgb(33,33,33)"></div>
<div style=3D"color:rgb(33,33,33)">
<div>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125);font-family:&quo=
t;Calibri&quot;,&quot;sans-serif&quot;;font-size:11pt">Hi Kireeti,</span></=
p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125);font-family:&quo=
t;Calibri&quot;,&quot;sans-serif&quot;;font-size:11pt">thank you for your k=
ind consideration, much appreciated.</span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125);font-family:&quo=
t;Calibri&quot;,&quot;sans-serif&quot;;font-size:11pt">Of course, TTL will =
break the loop and setting it to precise value may be one solution. But, as=
 Huub pointed, if ring experienced double failure
 loop still exist though less severe. And since nodes may be added and remo=
ved from the ring dynamically every node must be aware of number of nodes i=
n that ring.</span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125);font-family:&quo=
t;Calibri&quot;,&quot;sans-serif&quot;;font-size:11pt">Thus I personally pr=
efer option #3, (Extended) Special Purpose Label (that we can name later). =
The possible drawback, as with any new (E)SPL cases,
 is that it becomes new capability that now must be advertised as such.</sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125);font-family:&quo=
t;Calibri&quot;,&quot;sans-serif&quot;;font-size:11pt">But I agree, let=E2=
=80=99s list all three options as these are sound technical solutions to th=
e realistic scenario and any of TTL based may be used by
 itself or in combination with (E)SPL. (E)SPL may be used only if ring is h=
omogeneous in regard to this capability.</span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125);font-family:&quo=
t;Calibri&quot;,&quot;sans-serif&quot;;font-size:11pt">=C2=A0</span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125);font-family:&quo=
t;Calibri&quot;,&quot;sans-serif&quot;;font-size:11pt">=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Re=
gards,</span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125);font-family:&quo=
t;Calibri&quot;,&quot;sans-serif&quot;;font-size:11pt">=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 Greg</span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125);font-family:&quo=
t;Calibri&quot;,&quot;sans-serif&quot;;font-size:11pt">=C2=A0</span></p>
<div>
<div style=3D"border-width:1pt medium medium;border-style:solid none none;b=
order-color:rgb(181,196,223) currentColor currentColor;padding:3pt 0in 0in"=
>
<p class=3D"MsoNormal"><b><span style=3D"font-family:&quot;Tahoma&quot;,&qu=
ot;sans-serif&quot;;font-size:10pt">From:</span></b><span style=3D"font-fam=
ily:&quot;Tahoma&quot;,&quot;sans-serif&quot;;font-size:10pt"> Kireeti Komp=
ella [mailto:<a href=3D"mailto:kireeti.kompella@gmail.com" target=3D"_blank=
">kireeti.kompella@gmail.com</a>]
<br>
<b>Sent:</b> Friday, October 31, 2014 6:37 PM<br>
<b>To:</b> Gregory Mirsky<br>
<b>Cc:</b> Kireeti Kompella; <a href=3D"mailto:mpls@ietf.org" target=3D"_bl=
ank">mpls@ietf.org</a><br>
<b>Subject:</b> Re: [mpls] New Version Notification for draft-kompella-mpls=
-rmr-00.txt</span></p>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0</p>
<p class=3D"MsoNormal">Hi Greg,</p>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">On Oct 30, 2014, at 16:21 , Gregory Mirsky &lt;<a hr=
ef=3D"mailto:gregory.mirsky@ericsson.com" target=3D"_blank">gregory.mirsky@=
ericsson.com</a>&gt; wrote:</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
<div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125);font-family:&quo=
t;Calibri&quot;,&quot;sans-serif&quot;;font-size:11pt">Hi Kireeti,</span></=
p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125);font-family:&quo=
t;Calibri&quot;,&quot;sans-serif&quot;;font-size:11pt">I think that propose=
d in this document protection method creates some unpleasant scenario if fa=
ilure is of a node, not a link. If I use the scenario
 presented in Section 3.6 but assume that the failure is not of the link be=
tween R_j and R_j+1 but of the node Rj+1. Thus, as R_j switches to US direc=
tion, the R_j+2 will switch to DS. And until notifications from R_j and R_j=
+2 reach R_j+2 and R_j respectively
 we have routing loop on RL_j+1 LSP.</span></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">I appreciate your careful reading!=C2=A0 Note of cou=
rse that since there is a TTL, this is a finite loop (not saying it isn=E2=
=80=99t bad, but that this has the germ of the solution.)</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">I have three solutions for this problem. I didn=E2=
=80=99t put them in the first version of the draft; I may eventually docume=
nt all (and others, as the WG chimes in), but meanwhile this discussion is =
perfect.</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">My preferred solution is to always insert packets on=
 a ring LSP with TTL =3D 2N-1 if the ring has N nodes.=C2=A0 This is enough=
 for the worst case =E2=80=94 node R_j sends a packet on RL_j+1 the =E2=80=
=9Clong=E2=80=9D way around, only to encounter a failure at node R_j+2,
 and come all the way back to R_j, then R_j+1.</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">Another solution is that an ingress node sets the TT=
L as usual, but a PLR sets the TTL to the smaller of the current TTL-1 and =
the minimum TTL required to reach the egress. =C2=A0 =C2=A0So, in the above=
 example, R_j would set TTL as usual, but R_j+2,
 on detecting a failure, would set TTL =3D N-1 and send it the other way.=
=C2=A0 In this case, when the packet gets back to R_j, it should not in tur=
n reset the TTL to N-1.=C2=A0 Of course, both of the above can be combined.=
</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">Finally, a PLR (R_j+2) can push a special purpose la=
bel to indicate that this is a failure path, then push the label to go the =
other way.=C2=A0 If the packet goes back to R_j, before R_j sends it the ot=
her way, it sees that the label below the
 top of stack is this failure label, and drops the packet rather than cycle=
 it back around the ring.</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125);font-family:&quo=
t;Calibri&quot;,&quot;sans-serif&quot;;font-size:11pt">If my assumptions ar=
e correct, then notification mechanism MUST be reliable or be backed up by =
IGP signaling. In any case, the loop may persist
 for quite a while and affect all services.</span></p>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">Agreed, having a reliable notification mechanism is =
always a good thing.</p>
</div>
<p class=3D"MsoNormal"><br>
<br>
</p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125);font-family:&quo=
t;Calibri&quot;,&quot;sans-serif&quot;;font-size:11pt">Comments, questions =
are always welcome and greatly appreciated.</span></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">Greg, since you worked out the problem, do you have =
any opinions on the solutions above, or any of your own?</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">Cheers,</p>
</div>
<div>
<p class=3D"MsoNormal">Kireeti.</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125);font-family:&quo=
t;Calibri&quot;,&quot;sans-serif&quot;;font-size:11pt">=C2=A0=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Regards,</span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125);font-family:&quo=
t;Calibri&quot;,&quot;sans-serif&quot;;font-size:11pt">=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 Greg</span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125);font-family:&quo=
t;Calibri&quot;,&quot;sans-serif&quot;;font-size:11pt">=C2=A0</span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-family:&quot;Tahoma&quot;,&qu=
ot;sans-serif&quot;;font-size:10pt">From:</span></b><span style=3D"font-fam=
ily:&quot;Tahoma&quot;,&quot;sans-serif&quot;;font-size:10pt"> mpls [<a hre=
f=3D"mailto:mpls-bounces@ietf.org" target=3D"_blank">mailto:mpls-bounces@ie=
tf.org</a>]
<b>On Behalf Of </b>Kireeti Kompella<br>
<b>Sent:</b> Wednesday, October 29, 2014 10:41 AM<br>
<b>To:</b> <a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org=
</a><br>
<b>Subject:</b> [mpls] Fwd: New Version Notification for draft-kompella-mpl=
s-rmr-00.txt</span></p>
<p class=3D"MsoNormal">=C2=A0</p>
<div>
<p class=3D"MsoNormal">Hi Folks,</p>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">This is a draft on making MPLS more efficient in rin=
g networks.=C2=A0 I have come around to understanding that:</p>
</div>
<div>
<p class=3D"MsoNormal">a) rings are a special topology (there was a time th=
at I didn&#39;t appreciate that);</p>
</div>
<div>
<p class=3D"MsoNormal">b) MPLS is pretty inefficient in rings (that is/was =
quite obvious).</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">This draft attempts to fix that, both by making prot=
ection much more efficient, and by making configuration much easier.</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">Your comments are highly welcome!</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">Cheers,</p>
</div>
<div>
<p class=3D"MsoNormal">Kireeti.</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12pt">---------- Forwarded me=
ssage ----------<br>
From: &lt;<a href=3D"mailto:internet-drafts@ietf.org" target=3D"_blank">int=
ernet-drafts@ietf.org</a>&gt;<br>
Date: Sun, Oct 26, 2014 at 9:15 PM<br>
Subject: New Version Notification for draft-kompella-mpls-rmr-00.txt<br>
To: Kireeti Kompella &lt;<a href=3D"mailto:kireeti.kompella@gmail.com" targ=
et=3D"_blank">kireeti.kompella@gmail.com</a>&gt;<br>
<br>
<br>
<br>
A new version of I-D, draft-kompella-mpls-rmr-00.txt<br>
has been successfully submitted by Kireeti Kompella and posted to the<br>
IETF repository.<br>
<br>
Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-kompella-mpls-rmr<br>
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A000<br>
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Resilient MPLS Rings<br>
Document date:=C2=A0 2014-10-26<br>
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission<br>
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 7<br>
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"http://www.ietf.or=
g/internet-drafts/draft-kompella-mpls-rmr-00.txt" target=3D"_blank">
http://www.ietf.org/internet-drafts/draft-kompella-mpls-rmr-00.txt</a><br>
Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.iet=
f.org/doc/draft-kompella-mpls-rmr/" target=3D"_blank">https://datatracker.i=
etf.org/doc/draft-kompella-mpls-rmr/</a><br>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"http://tools.ietf.org/html/d=
raft-kompella-mpls-rmr-00" target=3D"_blank">http://tools.ietf.org/html/dra=
ft-kompella-mpls-rmr-00</a><br>
<br>
<br>
Abstract:<br>
=C2=A0 =C2=A0This document describes the use of the MPLS control and data p=
lanes<br>
=C2=A0 =C2=A0on ring topologies.=C2=A0 It describes the special nature of r=
ings, and<br>
=C2=A0 =C2=A0proceeds to show how MPLS can be effectively used in such topo=
logies.<br>
=C2=A0 =C2=A0It describes how MPLS rings are configured, auto-discovered an=
d<br>
=C2=A0 =C2=A0signaled, as well as how the data plane works.=C2=A0 Companion=
 documents<br>
=C2=A0 =C2=A0describe the details of discovery and signaling for specific<b=
r>
=C2=A0 =C2=A0protocols.<br>
<br>
<br>
<br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submissio=
n<br>
until the htmlized version and diff are available at <a href=3D"http://tool=
s.ietf.org/" target=3D"_blank">
tools.ietf.org</a>.<br>
<br>
The IETF Secretariat</p>
</div>
<p class=3D"MsoNormal"><br>
<br clear=3D"all">
</p>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<p class=3D"MsoNormal">-- <br>
Kireeti </p>
</div>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
</div>
</div>
<div style=3D"color:rgb(33,33,33)"></div>
</div></div></div>

<br>_______________________________________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" target=3D"_blank">ht=
tps://www.ietf.org/mailman/listinfo/mpls</a><br>
<br></blockquote></div><br></div></div>

--089e0158c8dab680c20506eea623--


From nobody Mon Nov  3 07:06:11 2014
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This draft is a support draft for the work on MRT that is being
led in RTGWG.

I have concerns about whether or not MRT technology has the  maturity
expected in the standards track. However that decision needs to be
taken in RTGWG and MPLS needs to follow their and lead in determining
the fate and track of this draft. This draft should not be published
ahead of the drafts that define the technology that it is supporting.

That said, the draft is well written and I cannot see any
reason why it should not be put forward for adoption as
an MPLS WG draft.

I have some minor comments below which should be looked at when
the draft is next revised.
  

- Stewart

==========




           LDP Extensions to Support Maximally Redundant Trees
                       draft-atlas-mpls-ldp-mrt-02



1.  Introduction



    IP/LDP Fast-Reroute using MRTs can provide 100% coverage for link and
    node failures in an arbitrary network topology where the failure
    doesn't split the network.  It can also be deployed incrementally; an

SB> NIT isn't the more common term partition the network?

    MRT Island is formed of connected supporting routers and the MRTs are
    computed inside that island.


3.  Terminology

    For ease of reading, some of the terminology defined in
    [I-D.ietf-rtgwg-mrt-frr-architecture] is repeated here.

SB> Minor point - repeating definitions means you you need
SB> to track the definitions in multiple drafts in the design
SB> and publication phase. I appreciate the convenience, but
SB> you should think hard about whether to retain this.

  Redundant Trees (RT):   A pair of trees where the path from any node
       X to the root R along the first tree is node-disjoint with the
       path from the same node X to the root along the second tree.
       These can be computed in 2-connected graphs.

    Maximally Redundant Trees (MRT):   A pair of trees where the path
       from any node X to the root R along the first tree and the path
       from the same node X to the root along the second tree share the
       minimum number of nodes and the minimum number of links.  Each
       such shared node is a cut-vertex.  Any shared links are cut-links.
       Any RT is an MRT but many MRTs are not RTs.  The two MRTs are
       referred to as MRT-Blue and MRT-Red.

    MRT-Red:   MRT-Red is used to describe one of the two MRTs; it is
       used to described the associated forwarding topology and MT-ID.
       Specifically, MRT-Red is the decreasing MRT where links in the
       GADAG are taken in the direction from a higher topologically
       ordered node to a lower one.

SB> Minor point - you should expand and reference GADAG


4.  Overview of LDP Signaling Extensions for MRT

SB> Nit - there is an English problem between the into para below
SB> and the list that follows. It does not scan from the intro to
SB> each member of the list.

    Routers need to know which of their neighbors support MRT.
    Supporting MRT indicates several different aspects of behavior, as
    listed below.

    1.  Support for Multi-Topology (MT) - this MAY also be indicated via
        the Multi-Topology LDP Capability [RFC7307].

    2.  Understand the Rainbow MRT MT-ID and apply the associated labels
        to all relevant MT-IDs.

    3.  Advertise the Rainbow MRT MT-ID to the appropriate neighbors for
        the associated prefix.

    4.  If acting as LDP egress for a prefix in the default topology,
        also advertise and act as egress for the same prefix in MRT-Red
        and MRT-Blue.

    5.  For a FEC learned from a neighbor that does not support MRT,
        originate FECS for MRT-Red and MRT-Blue with the same prefix.
SB> Nit s/FECS/FECs/
        This MRT Island egress behavior is to support an MRT Island that
        does not include all routers in the area/level.


4.1.1.  Interaction of LDP MRT Capability with IPv4 and IPv6

    An LSR which advertises the MRT LDP capability is expected to
    advertise MRT-related FEC-label bindings for both IPv4 and IPv6
    address families, if the LSR originates shortest-path FEC-label
    bindings for those address families.

SB> Surely the rule is that the you advertise bindings for the
SB> set of address families you support. That makes you IPv4 and/or
SB> IPv6 and/or IPvn agnostic.



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      charset=ISO-8859-1">
    <pre>This draft is a support draft for the work on MRT that is being 
led in RTGWG.

I have concerns about whether or not MRT technology has the  maturity 
expected in the standards track. However that decision needs to be 
taken in RTGWG and MPLS needs to follow their and lead in determining 
the fate and track of this draft. This draft should not be published 
ahead of the drafts that define the technology that it is supporting.

That said, the draft is well written and I cannot see any 
reason why it should not be put forward for adoption as 
an MPLS WG draft.

I have some minor comments below which should be looked at when
the draft is next revised.
&nbsp;

- Stewart

==========




          LDP Extensions to Support Maximally Redundant Trees
                      draft-atlas-mpls-ldp-mrt-02



1.  Introduction



   IP/LDP Fast-Reroute using MRTs can provide 100% coverage for link and
   node failures in an arbitrary network topology where the failure
   doesn't split the network.  It can also be deployed incrementally; an

SB&gt; NIT isn't the more common term partition the network?

  &nbsp;MRT Island is formed of connected supporting routers and the MRTs are
   computed inside that island.


3.  Terminology

   For ease of reading, some of the terminology defined in
   [I-D.ietf-rtgwg-mrt-frr-architecture] is repeated here.

SB&gt; Minor point - repeating definitions means you you need
SB&gt; to track the definitions in multiple drafts in the design
SB&gt; and publication phase. I appreciate the convenience, but
SB&gt; you should think hard about whether to retain this.

&nbsp;Redundant Trees (RT):   A pair of trees where the path from any node
      X to the root R along the first tree is node-disjoint with the
      path from the same node X to the root along the second tree.
      These can be computed in 2-connected graphs.

   Maximally Redundant Trees (MRT):   A pair of trees where the path
      from any node X to the root R along the first tree and the path
      from the same node X to the root along the second tree share the
      minimum number of nodes and the minimum number of links.  Each
      such shared node is a cut-vertex.  Any shared links are cut-links.
      Any RT is an MRT but many MRTs are not RTs.  The two MRTs are
      referred to as MRT-Blue and MRT-Red.

   MRT-Red:   MRT-Red is used to describe one of the two MRTs; it is
      used to described the associated forwarding topology and MT-ID.
      Specifically, MRT-Red is the decreasing MRT where links in the
      GADAG are taken in the direction from a higher topologically
      ordered node to a lower one.

SB&gt; Minor point - you should expand and reference GADAG


4.  Overview of LDP Signaling Extensions for MRT

SB&gt; Nit - there is an English problem between the into para below
SB&gt; and the list that follows. It does not scan from the intro to
SB&gt; each member of the list.

  &nbsp;Routers need to know which of their neighbors support MRT.
   Supporting MRT indicates several different aspects of behavior, as
   listed below.

   1.  Support for Multi-Topology (MT) - this MAY also be indicated via
       the Multi-Topology LDP Capability [RFC7307].

   2.  Understand the Rainbow MRT MT-ID and apply the associated labels
       to all relevant MT-IDs.

  &nbsp;3.  Advertise the Rainbow MRT MT-ID to the appropriate neighbors for
       the associated prefix.

   4.  If acting as LDP egress for a prefix in the default topology,
       also advertise and act as egress for the same prefix in MRT-Red
       and MRT-Blue.

   5.  For a FEC learned from a neighbor that does not support MRT,
       originate FECS for MRT-Red and MRT-Blue with the same prefix.
SB&gt; Nit s/FECS/FECs/
      &nbsp;This MRT Island egress behavior is to support an MRT Island that
       does not include all routers in the area/level.


4.1.1.  Interaction of LDP MRT Capability with IPv4 and IPv6

   An LSR which advertises the MRT LDP capability is expected to
   advertise MRT-related FEC-label bindings for both IPv4 and IPv6
   address families, if the LSR originates shortest-path FEC-label
   bindings for those address families.

SB&gt; Surely the rule is that the you advertise bindings for the
SB&gt; set of address families you support. That makes you IPv4 and/or
SB&gt; IPv6 and/or IPvn agnostic.


</pre>
  </body>
</html>

--------------040803010208040705060200--


From nobody Mon Nov  3 08:08:11 2014
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Cc: "draft-chandra-mpls-enhanced-frr-bypass@tools.ietf.org" <draft-chandra-mpls-enhanced-frr-bypass@tools.ietf.org>
Subject: [mpls] Refresh Interval Independent FRR facility protection
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Folks, Hi

We are proposing a few RSVP extensions to make Bypass-FRR procedures be inde=
pendent of the refresh-interval. The underlying motivation, the new extensio=
ns and the relevant procedures are all detailed in the following draft:

https://tools.ietf.org/html/draft-chandra-mpls-enhanced-frr-bypass-00

Please do give it a read and let us know what you think. Your comments are h=
ighly welcome.

Regards,
Pavan et al=


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Hi Kireeti,

>
> Hi Bhupesh,
>
>
>     On Oct 30, 2014, at 14:02 , Bhupesh Kothari <bhupesh@anvaya.net>
wrote:
>
>     Hi Kireeti,
>
>     Can you describe how L-ARP can be used between a DSLAM and its
upstream
>     router to form bi-directional tunnels?  I want to understand what, if
any,
>     assumptions are made.
>
>
> L-ARP is for the DSLAM (or server, or whatever) to talk to a BNG (or
remote
> server).  For the reverse direction, one possibility is =E2=80=9Clabeled =
DHCP=E2=80=9D.  A
> quick overview is that when a DSLAM X asks for an IP address, it also
says,
> allocate a label for me.  The upstream node (switch/BNG/CMTS) Y then
allocates
> a label, which it advertises to reach X.  That would establish
bidirectional
> connectivity.

If you have X and Y to begin, the solution works.  But that is not
always the case.  Take a L2 CMTS for example.  It has an IP address
but only for management, and is either connected on a separate
physical network for management or the management traffic is in-band
on a management VLAN.  For customer data traffic, which is what I want
to tunnel, it does not have visibility into what (and how many)
upstream routers are and is just a bridge in the data path.  In other
words, for label exchange is such a scenario, ARP semantics does not
fit well, especially in the reverse direction.


>
> To establish hierarchical tunnels, I would recommend L-BGP (RFC 3107).
Two
> possibilities: The X announces this label (with next hop Y); or Y
announces
> this label with itself as next hop.  In the former case, the L-DHCP reply
needs
> to have a label for X to advertise.
>
> If this makes sense (and interests you), I=E2=80=99d be happy to collabor=
ate with
you
> on the L-DHCP draft.

Interested.  Let me give you my general comments on the whole draft,
and see if I am on the same page.

Agree on the need for a simpler label distribution protocol in certain
scenarios.  Modeling the protocol as stateless with simple semantics
is highly desirable in such cases.

There are two key functions: endpoint discovery and label exchange
(including service labels).  The L-ARP message format though is biased
for host use case.  For example, a host knows (either static, DHCP or
NDP as in v6) what its default gateways are.  It also understands what
subnets imply.  But in the label exchange process for L2 topologies
where nodes are connected over an Ethernet fabric, such semantics
might not be applicable.  Traffic entering into the tunnel could be
based on some identifier other than IP destination such as a DOCSIS
channel.  In such a case, I am not looking to "resolve" an IP address.
You might say that in this case for all traffic, I am looking to
resolve the default gateway.

Re-using (hijacking ;-))  ARP Ether type does not buy you much.
Intermediate
nodes on an Ethernet fabric does not care for Ether Type.  The end
nodes that consume ARP anyway needs the new functionality.  I agree
that re-using a Ether type saves some changes relatively, but hardware
type in ARP, IMHO, is still intended for resolution and not for a new need.
Label exchange sounds like a new protocol.

One common use case I have is creating bi-directional tunnels between
access nodes and all routers.  In addition, there is a need to create
multiple tunnels (PWs is more appropriate) between a pair of access
node and its upstream routers for different traffic types.  The topology
fits your applicability.


>
> Kireeti.

Bhupesh

--001a11345d76fb424e0506f95a44
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hi Kireeti,</div><div><br></div><div>&gt;=C2=A0</div>=
<div>&gt; Hi Bhupesh,</div><div>&gt;=C2=A0</div><div>&gt;=C2=A0</div><div>&=
gt; =C2=A0 =C2=A0 On Oct 30, 2014, at 14:02 , Bhupesh Kothari &lt;<a href=
=3D"mailto:bhupesh@anvaya.net">bhupesh@anvaya.net</a>&gt; wrote:</div><div>=
&gt;=C2=A0</div><div>&gt; =C2=A0 =C2=A0 Hi Kireeti,</div><div>&gt;=C2=A0</d=
iv><div>&gt; =C2=A0 =C2=A0 Can you describe how L-ARP can be used between a=
 DSLAM and its upstream</div><div>&gt; =C2=A0 =C2=A0 router to form bi-dire=
ctional tunnels?=C2=A0 I want to understand what, if any,</div><div>&gt; =
=C2=A0 =C2=A0 assumptions are made.</div><div>&gt;=C2=A0</div><div>&gt;=C2=
=A0</div><div>&gt; L-ARP is for the DSLAM (or server, or whatever) to talk =
to a BNG (or remote</div><div>&gt; server).=C2=A0 For the reverse direction=
, one possibility is =E2=80=9Clabeled DHCP=E2=80=9D. =C2=A0A</div><div>&gt;=
 quick overview is that when a DSLAM X asks for an IP address, it also says=
,</div><div>&gt; allocate a label for me.=C2=A0 The upstream node (switch/B=
NG/CMTS) Y then allocates</div><div>&gt; a label, which it advertises to re=
ach X.=C2=A0 That would establish bidirectional</div><div>&gt; connectivity=
.</div><div><br></div><div>If you have X and Y to begin, the solution works=
.=C2=A0 But that is not</div><div>always the case.=C2=A0 Take a L2 CMTS for=
 example.=C2=A0 It has an IP address</div><div>but only for management, and=
 is either connected on a separate</div><div>physical network for managemen=
t or the management traffic is in-band</div><div>on a management VLAN.=C2=
=A0 For customer data traffic, which is what I want</div><div>to tunnel, it=
 does not have visibility into what (and how many)</div><div>upstream route=
rs are and is just a bridge in the data path.=C2=A0 In other</div><div>word=
s, for label exchange is such a scenario, ARP semantics does not</div><div>=
fit well, especially in the reverse direction.</div><div><br></div><div><br=
></div><div>&gt;=C2=A0</div><div>&gt; To establish hierarchical tunnels, I =
would recommend L-BGP (RFC 3107).=C2=A0 Two</div><div>&gt; possibilities: T=
he X announces this label (with next hop Y); or Y announces</div><div>&gt; =
this label with itself as next hop.=C2=A0 In the former case, the L-DHCP re=
ply needs</div><div>&gt; to have a label for X to advertise.</div><div>&gt;=
=C2=A0</div><div>&gt; If this makes sense (and interests you), I=E2=80=99d =
be happy to collaborate with you</div><div>&gt; on the L-DHCP draft.</div><=
div><br></div><div>Interested.=C2=A0 Let me give you my general comments on=
 the whole draft,</div><div>and see if I am on the same page.</div><div><br=
></div><div>Agree on the need for a simpler label distribution protocol in =
certain</div><div>scenarios.=C2=A0 Modeling the protocol as stateless with =
simple semantics</div><div>is highly desirable in such cases.=C2=A0</div><d=
iv><br></div><div>There are two key functions: endpoint discovery and label=
 exchange</div><div>(including service labels).=C2=A0 The L-ARP message for=
mat though is biased</div><div>for host use case.=C2=A0 For example, a host=
 knows (either static, DHCP or</div><div>NDP as in v6) what its default gat=
eways are.=C2=A0 It also understands what</div><div>subnets imply.=C2=A0 Bu=
t in the label exchange process for L2 topologies</div><div>where nodes are=
 connected over an Ethernet fabric, such semantics</div><div>might not be a=
pplicable.=C2=A0 Traffic entering into the tunnel could be</div><div>based =
on some identifier other than IP destination such as a DOCSIS</div><div>cha=
nnel.=C2=A0 In such a case, I am not looking to &quot;resolve&quot; an IP a=
ddress.</div><div>You might say that in this case for all traffic, I am loo=
king to</div><div>resolve the default gateway.</div><div><br></div><div>Re-=
using (hijacking ;-)) =C2=A0ARP Ether type does not buy you much.=C2=A0 Int=
ermediate=C2=A0</div><div>nodes on an Ethernet fabric does not care for Eth=
er Type.=C2=A0 The end=C2=A0</div><div>nodes that consume ARP anyway needs =
the new functionality.=C2=A0 I agree</div><div>that re-using a Ether type s=
aves some changes relatively, but hardware</div><div>type in ARP, IMHO, is =
still intended for resolution and not for a new need.</div><div>Label excha=
nge sounds like a new protocol.</div><div><br></div><div>One common use cas=
e I have is creating bi-directional tunnels between<br></div><div>access no=
des and all routers.=C2=A0 In addition, there is a need to create</div><div=
>multiple tunnels (PWs is more appropriate) between a pair of access</div><=
div>node and its upstream routers for different traffic types.=C2=A0 The to=
pology</div><div>fits your applicability.</div><div><br></div><div><br></di=
v><div>&gt;=C2=A0</div><div>&gt; Kireeti.</div><div><br></div><div>Bhupesh<=
/div><div><br></div><div class=3D"gmail_extra"><br></div></div>

--001a11345d76fb424e0506f95a44--


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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: <ccamp@ietf.org>, <mpls@ietf.org>
Date: Tue, 4 Nov 2014 21:14:48 -0000
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Subject: [mpls] Discussion of TEAS, MPLS and CCAMP charters in Honolulu
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Hi,

Deborah, Lou, George, Loa, and I managed a face-to-face meeting this week in
which we advanced our drafts of the charters for TEAS, MPLS, and CCAMP.

I plan to post these as inputs to our discussions as soon as I have a moment.

Deborah and Lou have set aside some time in the CCAMP meeting in Honolulu for
discussion of the charters and to allow you to express your opinions. I think
the plan is that the ADs introduce the charters allowing the chairs to chair the
meeting.

Cheers,
Adrian


From nobody Wed Nov  5 17:15:47 2014
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From: "Nobo Akiya (nobo)" <nobo@cisco.com>
To: Sriganesh Kini <sriganesh.kini@ericsson.com>, "spring@ietf.org" <spring@ietf.org>, "mpls@ietf.org" <mpls@ietf.org>
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Subject: [mpls] State changed: charter-ietf-mpls-06-00
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State changed to Informal IESG review.

URL: http://datatracker.ietf.org/doc/charter-ietf-mpls/


From nobody Sat Nov  8 10:18:54 2014
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Date: Sat, 08 Nov 2014 19:18:45 +0100
From: Loa Andersson <loa@pi.nu>
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Subject: [mpls] MPLS wg re-charter - overlap with ccamp, pce and teas
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Working Group,

As a result of the Routing Area tuning the MPLS wg is up for a
re-charter, the new proposed charter is found at.

http://datatracker.ietf.org/doc/charter-ietf-mpls/

The changes to the previous charter is comparatively minor and the
discussion on this charter proposal will be done on the MPLS wg
mailing list.

However, there is one part of the charter discussion concerning the
overlap between four working groups - mpls, teas, ccamp and pce - that
will initially be done at the f2f meeting here in Honolulu in the
ccamp meeting.

The four proposed charter are found at:

https://datatracker.ietf.org/doc/charter-ietf-teas/
https://datatracker.ietf.org/doc/charter-ietf-ccamp/
https://datatracker.ietf.org/doc/charter-ietf-mpls/
https://datatracker.ietf.org/doc/charter-ietf-pce/

THe CCAMP meeting is at:

    THURSDAY, November 13, 2014
    1640-1910 - Thursday Afternoon Session III
    Room: Coral 5

The ccamp agenda: https://datatracker.ietf.org/meeting/91/agenda/ccamp/

The charter discussion is scheduled early on the agenda

/Loa
for the MPLS working group chairs
-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


From nobody Sun Nov  9 08:08:39 2014
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All,

we had to reshuffle the agenda, leading to important changes.
Please have a look at the latest and hopefully last version of the agenda:
http://www.ietf.org/proceedings/91/agenda/agenda-91-mpls

sorry for the inconvenience caused.

By the way, I have only received few presentation materials, please send 
to me them by noon today.

-m


From nobody Sun Nov  9 11:13:17 2014
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From: "Siva Sivabalan (msiva)" <msiva@cisco.com>
To: Sriganesh Kini <sriganesh.kini@ericsson.com>, Loa Andersson <loa@pi.nu>
Thread-Topic: [mpls] IPR poll on draft-kini-mpls-spring-entropy-label
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Subject: Re: [mpls] IPR poll on draft-kini-mpls-spring-entropy-label
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From: Kireeti Kompella <kireeti@juniper.net>
To: "Siva Sivabalan (msiva)" <msiva@cisco.com>
Thread-Topic: [mpls] IPR poll on draft-kini-mpls-spring-entropy-label
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Date: Sun, 9 Nov 2014 22:25:41 +0000
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Subject: Re: [mpls] IPR poll on draft-kini-mpls-spring-entropy-label
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Me neither.

Kireeti

On Nov 9, 2014, at 09:13, Siva Sivabalan (msiva) <msiva@cisco.com<mailto:ms=
iva@cisco.com>> wrote:

Hi Loa,

(sorry for the delay)

I am not aware of any IPR.

Thanks,
Siva

From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Sriganesh Kini
Sent: Tuesday, October 21, 2014 12:59 PM
To: Loa Andersson
Cc: mpls@ietf.org<mailto:mpls@ietf.org>; mpls-chairs@tools.ietf.org<mailto:=
mpls-chairs@tools.ietf.org>; draft-kini-mpls-spring-entropy-label@tools.iet=
f.org<mailto:draft-kini-mpls-spring-entropy-label@tools.ietf.org>
Subject: Re: [mpls] IPR poll on draft-kini-mpls-spring-entropy-label

Hi Loa,

I am not aware of IPR related to solutions recommended in this draft.

Sri

On Fri, Oct 17, 2014 at 11:41 AM, Loa Andersson <loa@pi.nu<mailto:loa@pi.nu=
>> wrote:
Folks,

I have been made aware of that I have there is a mistake in this
IPR poll.

I wrote that there is one IPR disclosed against this document, that
is not correct. There are no IPRs disclosed against the document.

The authors that have responded that they are not aware of IPRs, will
not have to re-state this.

/Loa


On 2014-10-17 15:59, Loa Andersson wrote:
Working Group,

We have done an MPLS-RT review of draft-kini-mpls-spring-entropy-label.

The outcome is such that we anticipate a poll for working group adoption
after the authors have updated the draft.

Before we do poll to see if we have consensus to accept the document
as a working group document we want to do an IPR poll on the document.

This mail starts that IPR poll.

Are you aware of any IPR that applies to draft-kini-mpls-spring-entropy-
label?

If so, has this IPR been disclosed in compliance with IETF IPR rules
(see RFCs 3979, 4879, 3669 and 5378 for more details).

Currently there are one IPR disclosures that relates to this document.

If you are listed as a document author or contributor please respond to
this email regardless of whether or not you are aware of any relevant
IPR. *The response needs to be sent to the MPLS wg mailing list.* The
document will not advance to the next stage until a response has been
received from each author and contributor.

If you are on the MPLS WG email list but are not listed as an author or
contributor, then please explicitly respond only if you are aware of any
IPR that has not yet been disclosed in conformance with IETF rules.

Thanks, Loa
(as MPLS WG co-chair)

--


Loa Andersson                        email: loa@mail01.huawei.com<mailto:lo=
a@mail01.huawei.com>
Senior MPLS Expert                          loa@pi.nu<mailto:loa@pi.nu>
Huawei Technologies (consultant)     phone: +46 739 81 21 64<tel:%2B46%2073=
9%2081%2021%2064>

_______________________________________________
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<div>Me neither.&nbsp;<br>
<br>
Kireeti</div>
<div><br>
On Nov 9, 2014, at 09:13, Siva Sivabalan (msiva) &lt;<a href=3D"mailto:msiv=
a@cisco.com">msiva@cisco.com</a>&gt; wrote:<br>
<br>
</div>
<blockquote type=3D"cite">
<div>
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Hi Loa,<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">(sorry for the delay)<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">I am not aware of any IPR=
.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Thanks,<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Siva<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> mpls [<a=
 href=3D"mailto:mpls-bounces@ietf.org">mailto:mpls-bounces@ietf.org</a>]
<b>On Behalf Of </b>Sriganesh Kini<br>
<b>Sent:</b> Tuesday, October 21, 2014 12:59 PM<br>
<b>To:</b> Loa Andersson<br>
<b>Cc:</b> <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>; <a href=3D"m=
ailto:mpls-chairs@tools.ietf.org">
mpls-chairs@tools.ietf.org</a>; <a href=3D"mailto:draft-kini-mpls-spring-en=
tropy-label@tools.ietf.org">
draft-kini-mpls-spring-entropy-label@tools.ietf.org</a><br>
<b>Subject:</b> Re: [mpls] IPR poll on draft-kini-mpls-spring-entropy-label=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal">Hi Loa,<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">I am not aware of IPR related to solutions recommend=
ed in this draft.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Sri<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal">On Fri, Oct 17, 2014 at 11:41 AM, Loa Andersson &lt;=
<a href=3D"mailto:loa@pi.nu" target=3D"_blank">loa@pi.nu</a>&gt; wrote:<o:p=
></o:p></p>
<p class=3D"MsoNormal">Folks,<br>
<br>
I have been made aware of that I have there is a mistake in this<br>
IPR poll.<br>
<br>
I wrote that there is one IPR disclosed against this document, that<br>
is not correct. There are no IPRs disclosed against the document.<br>
<br>
The authors that have responded that they are not aware of IPRs, will<br>
not have to re-state this.<span style=3D"color:#888888"><br>
<br>
/Loa</span><o:p></o:p></p>
<div>
<div>
<p class=3D"MsoNormal"><br>
<br>
On 2014-10-17 15:59, Loa Andersson wrote:<o:p></o:p></p>
<p class=3D"MsoNormal">Working Group,<br>
<br>
We have done an MPLS-RT review of draft-kini-mpls-spring-entropy-label.<br>
<br>
The outcome is such that we anticipate a poll for working group adoption<br=
>
after the authors have updated the draft.<br>
<br>
Before we do poll to see if we have consensus to accept the document<br>
as a working group document we want to do an IPR poll on the document.<br>
<br>
This mail starts that IPR poll.<br>
<br>
Are you aware of any IPR that applies to draft-kini-mpls-spring-entropy-<br=
>
label?<br>
<br>
If so, has this IPR been disclosed in compliance with IETF IPR rules<br>
(see RFCs 3979, 4879, 3669 and 5378 for more details).<br>
<br>
Currently there are one IPR disclosures that relates to this document.<br>
<br>
If you are listed as a document author or contributor please respond to<br>
this email regardless of whether or not you are aware of any relevant<br>
IPR. *The response needs to be sent to the MPLS wg mailing list.* The<br>
document will not advance to the next stage until a response has been<br>
received from each author and contributor.<br>
<br>
If you are on the MPLS WG email list but are not listed as an author or<br>
contributor, then please explicitly respond only if you are aware of any<br=
>
IPR that has not yet been disclosed in conformance with IETF rules.<br>
<br>
Thanks, Loa<br>
(as MPLS WG co-chair)<o:p></o:p></p>
<p class=3D"MsoNormal"><br>
-- <br>
<br>
<br>
Loa Andersson&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;=
 &nbsp; &nbsp; &nbsp; email: <a href=3D"mailto:loa@mail01.huawei.com" targe=
t=3D"_blank">
loa@mail01.huawei.com</a><br>
Senior MPLS Expert&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &=
nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a href=3D"mailto:loa@pi.nu" target=3D"_b=
lank">
loa@pi.nu</a><br>
Huawei Technologies (consultant)&nbsp; &nbsp; &nbsp;phone: <a href=3D"tel:%=
2B46%20739%2081%2021%2064" target=3D"_blank">
&#43;46 739 81 21 64</a><br>
<br>
_______________________________________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" target=3D"_blank">ht=
tps://www.ietf.org/mailman/listinfo/mpls</a><o:p></o:p></p>
</div>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
</div>
</div>
</blockquote>
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To: Kireeti Kompella <kireeti@juniper.net>
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Subject: Re: [mpls] IPR poll on draft-kini-mpls-spring-entropy-label
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Me neither

Regards,
Jeff

On Nov 9, 2014, at 12:25 PM, Kireeti Kompella <kireeti@juniper.net<mailto:k=
ireeti@juniper.net>> wrote:

Me neither.

Kireeti

On Nov 9, 2014, at 09:13, Siva Sivabalan (msiva) <msiva@cisco.com<mailto:ms=
iva@cisco.com>> wrote:

Hi Loa,

(sorry for the delay)

I am not aware of any IPR.

Thanks,
Siva

From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Sriganesh Kini
Sent: Tuesday, October 21, 2014 12:59 PM
To: Loa Andersson
Cc: mpls@ietf.org<mailto:mpls@ietf.org>; mpls-chairs@tools.ietf.org<mailto:=
mpls-chairs@tools.ietf.org>; draft-kini-mpls-spring-entropy-label@tools.iet=
f.org<mailto:draft-kini-mpls-spring-entropy-label@tools.ietf.org>
Subject: Re: [mpls] IPR poll on draft-kini-mpls-spring-entropy-label

Hi Loa,

I am not aware of IPR related to solutions recommended in this draft.

Sri

On Fri, Oct 17, 2014 at 11:41 AM, Loa Andersson <loa@pi.nu<mailto:loa@pi.nu=
>> wrote:
Folks,

I have been made aware of that I have there is a mistake in this
IPR poll.

I wrote that there is one IPR disclosed against this document, that
is not correct. There are no IPRs disclosed against the document.

The authors that have responded that they are not aware of IPRs, will
not have to re-state this.

/Loa


On 2014-10-17 15:59, Loa Andersson wrote:
Working Group,

We have done an MPLS-RT review of draft-kini-mpls-spring-entropy-label.

The outcome is such that we anticipate a poll for working group adoption
after the authors have updated the draft.

Before we do poll to see if we have consensus to accept the document
as a working group document we want to do an IPR poll on the document.

This mail starts that IPR poll.

Are you aware of any IPR that applies to draft-kini-mpls-spring-entropy-
label?

If so, has this IPR been disclosed in compliance with IETF IPR rules
(see RFCs 3979, 4879, 3669 and 5378 for more details).

Currently there are one IPR disclosures that relates to this document.

If you are listed as a document author or contributor please respond to
this email regardless of whether or not you are aware of any relevant
IPR. *The response needs to be sent to the MPLS wg mailing list.* The
document will not advance to the next stage until a response has been
received from each author and contributor.

If you are on the MPLS WG email list but are not listed as an author or
contributor, then please explicitly respond only if you are aware of any
IPR that has not yet been disclosed in conformance with IETF rules.

Thanks, Loa
(as MPLS WG co-chair)

--


Loa Andersson                        email: loa@mail01.huawei.com<mailto:lo=
a@mail01.huawei.com>
Senior MPLS Expert                          loa@pi.nu<mailto:loa@pi.nu>
Huawei Technologies (consultant)     phone: +46 739 81 21 64<tel:%2B46%2073=
9%2081%2021%2064>

_______________________________________________
mpls mailing list
mpls@ietf.org<mailto:mpls@ietf.org>
https://www.ietf.org/mailman/listinfo/mpls

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<div>Me neither&nbsp;<br>
<br>
Regards,
<div>Jeff</div>
</div>
<div><br>
On Nov 9, 2014, at 12:25 PM, Kireeti Kompella &lt;<a href=3D"mailto:kireeti=
@juniper.net">kireeti@juniper.net</a>&gt; wrote:<br>
<br>
</div>
<blockquote type=3D"cite">
<div>
<div>Me neither.&nbsp;<br>
<br>
Kireeti</div>
<div><br>
On Nov 9, 2014, at 09:13, Siva Sivabalan (msiva) &lt;<a href=3D"mailto:msiv=
a@cisco.com">msiva@cisco.com</a>&gt; wrote:<br>
<br>
</div>
<blockquote type=3D"cite">
<div>
<meta name=3D"Generator" content=3D"Microsoft Word 14 (filtered medium)">
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<o:idmap v:ext=3D"edit" data=3D"1" />
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Hi Loa,<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">(sorry for the delay)<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">I am not aware of any IPR=
.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Thanks,<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Siva<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> mpls [<a=
 href=3D"mailto:mpls-bounces@ietf.org">mailto:mpls-bounces@ietf.org</a>]
<b>On Behalf Of </b>Sriganesh Kini<br>
<b>Sent:</b> Tuesday, October 21, 2014 12:59 PM<br>
<b>To:</b> Loa Andersson<br>
<b>Cc:</b> <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>; <a href=3D"m=
ailto:mpls-chairs@tools.ietf.org">
mpls-chairs@tools.ietf.org</a>; <a href=3D"mailto:draft-kini-mpls-spring-en=
tropy-label@tools.ietf.org">
draft-kini-mpls-spring-entropy-label@tools.ietf.org</a><br>
<b>Subject:</b> Re: [mpls] IPR poll on draft-kini-mpls-spring-entropy-label=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal">Hi Loa,<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">I am not aware of IPR related to solutions recommend=
ed in this draft.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Sri<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal">On Fri, Oct 17, 2014 at 11:41 AM, Loa Andersson &lt;=
<a href=3D"mailto:loa@pi.nu" target=3D"_blank">loa@pi.nu</a>&gt; wrote:<o:p=
></o:p></p>
<p class=3D"MsoNormal">Folks,<br>
<br>
I have been made aware of that I have there is a mistake in this<br>
IPR poll.<br>
<br>
I wrote that there is one IPR disclosed against this document, that<br>
is not correct. There are no IPRs disclosed against the document.<br>
<br>
The authors that have responded that they are not aware of IPRs, will<br>
not have to re-state this.<span style=3D"color:#888888"><br>
<br>
/Loa</span><o:p></o:p></p>
<div>
<div>
<p class=3D"MsoNormal"><br>
<br>
On 2014-10-17 15:59, Loa Andersson wrote:<o:p></o:p></p>
<p class=3D"MsoNormal">Working Group,<br>
<br>
We have done an MPLS-RT review of draft-kini-mpls-spring-entropy-label.<br>
<br>
The outcome is such that we anticipate a poll for working group adoption<br=
>
after the authors have updated the draft.<br>
<br>
Before we do poll to see if we have consensus to accept the document<br>
as a working group document we want to do an IPR poll on the document.<br>
<br>
This mail starts that IPR poll.<br>
<br>
Are you aware of any IPR that applies to draft-kini-mpls-spring-entropy-<br=
>
label?<br>
<br>
If so, has this IPR been disclosed in compliance with IETF IPR rules<br>
(see RFCs 3979, 4879, 3669 and 5378 for more details).<br>
<br>
Currently there are one IPR disclosures that relates to this document.<br>
<br>
If you are listed as a document author or contributor please respond to<br>
this email regardless of whether or not you are aware of any relevant<br>
IPR. *The response needs to be sent to the MPLS wg mailing list.* The<br>
document will not advance to the next stage until a response has been<br>
received from each author and contributor.<br>
<br>
If you are on the MPLS WG email list but are not listed as an author or<br>
contributor, then please explicitly respond only if you are aware of any<br=
>
IPR that has not yet been disclosed in conformance with IETF rules.<br>
<br>
Thanks, Loa<br>
(as MPLS WG co-chair)<o:p></o:p></p>
<p class=3D"MsoNormal"><br>
-- <br>
<br>
<br>
Loa Andersson&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;=
 &nbsp; &nbsp; &nbsp; email: <a href=3D"mailto:loa@mail01.huawei.com" targe=
t=3D"_blank">
loa@mail01.huawei.com</a><br>
Senior MPLS Expert&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &=
nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a href=3D"mailto:loa@pi.nu" target=3D"_b=
lank">
loa@pi.nu</a><br>
Huawei Technologies (consultant)&nbsp; &nbsp; &nbsp;phone: <a href=3D"tel:%=
2B46%20739%2081%2021%2064" target=3D"_blank">
&#43;46 739 81 21 64</a><br>
<br>
_______________________________________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" target=3D"_blank">ht=
tps://www.ietf.org/mailman/listinfo/mpls</a><o:p></o:p></p>
</div>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</blockquote>
<blockquote type=3D"cite">
<div><span>_______________________________________________</span><br>
<span>mpls mailing list</span><br>
<span><a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a></span><br>
<span><a href=3D"https://www.ietf.org/mailman/listinfo/mpls">https://www.ie=
tf.org/mailman/listinfo/mpls</a></span><br>
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From nobody Mon Nov 10 00:53:09 2014
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Subject: [mpls] I-D Action: draft-ietf-mpls-lsp-ping-registry-00.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Multiprotocol Label Switching Working Group of the IETF.

        Title           : IANA registries for LSP ping Code Points
        Authors         : Bruno Decraene
                          Nobo Akiya
                          Carlos Pignataro
                          Loa Andersson
                          Sam Aldrin
	Filename        : draft-ietf-mpls-lsp-ping-registry-00.txt
	Pages           : 6
	Date            : 2014-11-09

Abstract:
   RFC 4379 and RFC 6424 created name spaces for Multiprotocol Label
   Switching (MPLS) Label Switched Path (LSP) Ping.  However, those RFC
   did not create the corresponding IANA registries for DS Flags,
   Multipath Type, Pad TLV and Address Types.

   There is now a need to make further code point allocations from these
   name spaces.  This document updates RFC 4379 and RFC 6424 in that it
   creates the IANA registries for that purpose.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-lsp-ping-registry/

There's also a htmlized version available at:
http://tools.ietf.org/html/draft-ietf-mpls-lsp-ping-registry-00


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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bier
Monday, November 10, 2014
1:00 pm | Hawaii Time (Honolulu, GMT-10:00) | 2 hr

Join WebEx meeting:
https://workgreen.webex.com/workgreen/j.php?MTID=mdfb183b4cd0d2cfaeceacf3950895a00
Meeting number: 825 308 148
Meeting password: 1234

Looking forward to seeing (hearing) you all there!

Cheers,
Greg

--bcaec53f386bc425bb050784220c
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<div dir=3D"ltr"><span style=3D"font-family:arial,sans-serif;font-size:13px=
">bier</span><br style=3D"font-family:arial,sans-serif;font-size:13px"><spa=
n style=3D"font-family:arial,sans-serif;font-size:13px">Monday, November 10=
, 2014</span><br style=3D"font-family:arial,sans-serif;font-size:13px"><spa=
n style=3D"font-family:arial,sans-serif;font-size:13px">1:00 pm | Hawaii Ti=
me (Honolulu, GMT-10:00) | 2 hr</span><br style=3D"font-family:arial,sans-s=
erif;font-size:13px"><br style=3D"font-family:arial,sans-serif;font-size:13=
px"><span style=3D"font-family:arial,sans-serif;font-size:13px">Join WebEx =
meeting:</span><br style=3D"font-family:arial,sans-serif;font-size:13px"><a=
 href=3D"https://workgreen.webex.com/workgreen/j.php?MTID=3Dmdfb183b4cd0d2c=
faeceacf3950895a00" target=3D"_blank" style=3D"font-family:arial,sans-serif=
;font-size:13px">https://workgreen.webex.com/workgreen/j.php?MTID=3Dmdfb183=
b4cd0d2cfaeceacf3950895a00</a><br style=3D"font-family:arial,sans-serif;fon=
t-size:13px"><span style=3D"font-family:arial,sans-serif;font-size:13px">Me=
eting number: 825 308 148</span><br style=3D"font-family:arial,sans-serif;f=
ont-size:13px"><span style=3D"font-family:arial,sans-serif;font-size:13px">=
Meeting password: 1234</span><br><div><span style=3D"font-family:arial,sans=
-serif;font-size:13px"><br></span></div><div><font face=3D"arial, sans-seri=
f">Looking forward to seeing (hearing) you all there!</font></div><div><fon=
t face=3D"arial, sans-serif"><br></font></div><div><font face=3D"arial, san=
s-serif">Cheers,</font></div><div><font face=3D"arial, sans-serif">Greg</fo=
nt></div></div>

--bcaec53f386bc425bb050784220c--


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Date: Mon, 10 Nov 2014 12:45:34 -0800
From: "S. Davari" <davarish@yahoo.com>
To: "mpls@ietf.org" <mpls@ietf.org>
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Subject: [mpls] commnets on draft-kini-mpls-spring-entropy-label
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Hi Authors,

As stated during this morning's IETF meeting, I wanted to suggest having an option to not use ELI to indicate EL and just signal having EL with the Tunnel Label. So existence of EL becomes a property of the Tunnel Label. This would reduce number of labels in the stack.


Thanks
Shahram

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<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px"><div>Hi Authors,</div><div><br></div><div style="color: rgb(0, 0, 0); font-size: 12px; font-family: HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; background-color: transparent; font-style: normal;">As stated during this morning's IETF meeting, I wanted to suggest having an option to not use ELI to indicate EL and just signal having EL with the Tunnel Label. So existence of EL becomes a property of the Tunnel Label. This would reduce number of labels in the stack.<br></div><div style="color: rgb(0, 0, 0); font-size: 12px; font-family: HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 12px; font-family: HelveticaNeue,Helvetica
 Neue,Helvetica,Arial,Lucida Grande,sans-serif; background-color: transparent; font-style: normal;">Thanks</div><div style="color: rgb(0, 0, 0); font-size: 12px; font-family: HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; background-color: transparent; font-style: normal;">Shahram<br></div></div></body></html>
--1024699347-1222848839-1415652334=:98541--


From nobody Mon Nov 10 14:57:16 2014
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Date: Mon, 10 Nov 2014 14:57:11 -0800
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From: Greg Shepherd <gjshep@gmail.com>
To: "bier@ietf.org" <bier@ietf.org>, "mboned@ietf.org" <mboned@ietf.org>, "pim@ietf.org" <pim@ietf.org>, mpls@ietf.org, rtgwg@ietf.org
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Subject: Re: [mpls] BIER BoF Today, w/ WebEx details
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Your WebEx session for IETF 91 has been scheduled. You should have just
received an invitation in your email for this meeting; you should forward
this
information to your participants. Participants may also join from the
http://www.ietf.org/meeting/91/remote-participation.html.

Note that remote participants will need to listen to the audio stream
(linked
from both http://www.ietf.org/meeting/91/remote-participation.html and
http://tools.ietf.org/agenda/91/) to follow the discussion.

To claim the host role for your meeting, first join as a regular
participant.
Then, go to the participant menu at the top of the screen and choose "Claim
Host Role." You will be prompted for the host key.

Host Key: 684911

More information about WebEx may be found at
http://www.ietf.org/wg/webex.html and
http://www.ietf.org/wg/webex-hosting.pdf.

Information about claiming the host role and running your WebEx meeting will
also be found on the chairs' table at the front of the meeting room, and the
host keys can be found at: http://www.ietf.org/private/webex-host-keys.html

Best regards,
Cindy

On Mon, Nov 10, 2014 at 9:03 AM, Greg Shepherd <gjshep@gmail.com> wrote:

> bier
> Monday, November 10, 2014
> 1:00 pm | Hawaii Time (Honolulu, GMT-10:00) | 2 hr
>
> Join WebEx meeting:
>
> https://workgreen.webex.com/workgreen/j.php?MTID=mdfb183b4cd0d2cfaeceacf3950895a00
> Meeting number: 825 308 148
> Meeting password: 1234
>
> Looking forward to seeing (hearing) you all there!
>
> Cheers,
> Greg
>

--f46d043bdff836b6840507891565
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<div dir=3D"ltr"><span style=3D"font-family:arial,sans-serif;font-size:13px=
">Your=C2=A0</span><span class=3D"" style=3D"font-family:arial,sans-serif;f=
ont-size:13px">WebEx</span><span style=3D"font-family:arial,sans-serif;font=
-size:13px">=C2=A0session for IETF 91 has been scheduled. You should have j=
ust</span><br style=3D"font-family:arial,sans-serif;font-size:13px"><span s=
tyle=3D"font-family:arial,sans-serif;font-size:13px">received an invitation=
 in your email for this meeting; you should forward this</span><br style=3D=
"font-family:arial,sans-serif;font-size:13px"><span style=3D"font-family:ar=
ial,sans-serif;font-size:13px">information to your participants. Participan=
ts may also join from the</span><br style=3D"font-family:arial,sans-serif;f=
ont-size:13px"><a href=3D"http://www.ietf.org/meeting/91/remote-participati=
on.html" target=3D"_blank" style=3D"font-family:arial,sans-serif;font-size:=
13px">http://www.ietf.org/meeting/91/remote-participation.html</a><span sty=
le=3D"font-family:arial,sans-serif;font-size:13px">.</span><br style=3D"fon=
t-family:arial,sans-serif;font-size:13px"><br style=3D"font-family:arial,sa=
ns-serif;font-size:13px"><span style=3D"font-family:arial,sans-serif;font-s=
ize:13px">Note that remote participants will need to listen to the audio st=
ream (linked</span><br style=3D"font-family:arial,sans-serif;font-size:13px=
"><span style=3D"font-family:arial,sans-serif;font-size:13px">from both=C2=
=A0</span><a href=3D"http://www.ietf.org/meeting/91/remote-participation.ht=
ml" target=3D"_blank" style=3D"font-family:arial,sans-serif;font-size:13px"=
>http://www.ietf.org/meeting/91/remote-participation.html</a><span style=3D=
"font-family:arial,sans-serif;font-size:13px">=C2=A0and</span><br style=3D"=
font-family:arial,sans-serif;font-size:13px"><a href=3D"http://tools.ietf.o=
rg/agenda/91/" target=3D"_blank" style=3D"font-family:arial,sans-serif;font=
-size:13px">http://tools.ietf.org/agenda/91/</a><span style=3D"font-family:=
arial,sans-serif;font-size:13px">) to follow the discussion.</span><br styl=
e=3D"font-family:arial,sans-serif;font-size:13px"><br style=3D"font-family:=
arial,sans-serif;font-size:13px"><span style=3D"font-family:arial,sans-seri=
f;font-size:13px">To claim the host role for your meeting, first join as a =
regular participant.</span><br style=3D"font-family:arial,sans-serif;font-s=
ize:13px"><span style=3D"font-family:arial,sans-serif;font-size:13px">Then,=
 go to the participant menu at the top of the screen and choose &quot;Claim=
</span><br style=3D"font-family:arial,sans-serif;font-size:13px"><span styl=
e=3D"font-family:arial,sans-serif;font-size:13px">Host Role.&quot; You will=
 be prompted for the host key.</span><br style=3D"font-family:arial,sans-se=
rif;font-size:13px"><br style=3D"font-family:arial,sans-serif;font-size:13p=
x"><span style=3D"font-family:arial,sans-serif;font-size:13px">Host Key: 68=
4911</span><br style=3D"font-family:arial,sans-serif;font-size:13px"><br st=
yle=3D"font-family:arial,sans-serif;font-size:13px"><span style=3D"font-fam=
ily:arial,sans-serif;font-size:13px">More information about=C2=A0</span><sp=
an class=3D"" style=3D"font-family:arial,sans-serif;font-size:13px">WebEx</=
span><span style=3D"font-family:arial,sans-serif;font-size:13px">=C2=A0may =
be found at</span><br style=3D"font-family:arial,sans-serif;font-size:13px"=
><a href=3D"http://www.ietf.org/wg/webex.html" target=3D"_blank" style=3D"f=
ont-family:arial,sans-serif;font-size:13px">http://www.ietf.org/wg/<span cl=
ass=3D"">webex</span>.html</a><span style=3D"font-family:arial,sans-serif;f=
ont-size:13px">=C2=A0and</span><br style=3D"font-family:arial,sans-serif;fo=
nt-size:13px"><a href=3D"http://www.ietf.org/wg/webex-hosting.pdf" target=
=3D"_blank" style=3D"font-family:arial,sans-serif;font-size:13px">http://ww=
w.ietf.org/wg/<span class=3D"">webex</span>-hosting.pdf</a><span style=3D"f=
ont-family:arial,sans-serif;font-size:13px">.</span><br style=3D"font-famil=
y:arial,sans-serif;font-size:13px"><br style=3D"font-family:arial,sans-seri=
f;font-size:13px"><span style=3D"font-family:arial,sans-serif;font-size:13p=
x">Information about claiming the host role and running your=C2=A0</span><s=
pan class=3D"" style=3D"font-family:arial,sans-serif;font-size:13px">WebEx<=
/span><span style=3D"font-family:arial,sans-serif;font-size:13px">=C2=A0mee=
ting will</span><br style=3D"font-family:arial,sans-serif;font-size:13px"><=
span style=3D"font-family:arial,sans-serif;font-size:13px">also be found on=
 the chairs&#39; table at the front of the meeting room, and the</span><br =
style=3D"font-family:arial,sans-serif;font-size:13px"><span style=3D"font-f=
amily:arial,sans-serif;font-size:13px">host keys can be found at:=C2=A0</sp=
an><a href=3D"http://www.ietf.org/private/webex-host-keys.html" target=3D"_=
blank" style=3D"font-family:arial,sans-serif;font-size:13px">http://www.iet=
f.org/private/<span class=3D"">webex</span>-host-keys.html</a><br style=3D"=
font-family:arial,sans-serif;font-size:13px"><br style=3D"font-family:arial=
,sans-serif;font-size:13px"><span style=3D"font-family:arial,sans-serif;fon=
t-size:13px">Best regards,</span><br style=3D"font-family:arial,sans-serif;=
font-size:13px"><span style=3D"font-family:arial,sans-serif;font-size:13px"=
>Cindy</span><br></div><div class=3D"gmail_extra"><br><div class=3D"gmail_q=
uote">On Mon, Nov 10, 2014 at 9:03 AM, Greg Shepherd <span dir=3D"ltr">&lt;=
<a href=3D"mailto:gjshep@gmail.com" target=3D"_blank">gjshep@gmail.com</a>&=
gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 =
0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr"><span =
style=3D"font-family:arial,sans-serif;font-size:13px">bier</span><br style=
=3D"font-family:arial,sans-serif;font-size:13px"><span style=3D"font-family=
:arial,sans-serif;font-size:13px">Monday, November 10, 2014</span><br style=
=3D"font-family:arial,sans-serif;font-size:13px"><span style=3D"font-family=
:arial,sans-serif;font-size:13px">1:00 pm | Hawaii Time (Honolulu, GMT-10:0=
0) | 2 hr</span><br style=3D"font-family:arial,sans-serif;font-size:13px"><=
br style=3D"font-family:arial,sans-serif;font-size:13px"><span style=3D"fon=
t-family:arial,sans-serif;font-size:13px">Join WebEx meeting:</span><br sty=
le=3D"font-family:arial,sans-serif;font-size:13px"><a href=3D"https://workg=
reen.webex.com/workgreen/j.php?MTID=3Dmdfb183b4cd0d2cfaeceacf3950895a00" st=
yle=3D"font-family:arial,sans-serif;font-size:13px" target=3D"_blank">https=
://workgreen.webex.com/workgreen/j.php?MTID=3Dmdfb183b4cd0d2cfaeceacf395089=
5a00</a><br style=3D"font-family:arial,sans-serif;font-size:13px"><span sty=
le=3D"font-family:arial,sans-serif;font-size:13px">Meeting number: 825 308 =
148</span><br style=3D"font-family:arial,sans-serif;font-size:13px"><span s=
tyle=3D"font-family:arial,sans-serif;font-size:13px">Meeting password: 1234=
</span><br><div><span style=3D"font-family:arial,sans-serif;font-size:13px"=
><br></span></div><div><font face=3D"arial, sans-serif">Looking forward to =
seeing (hearing) you all there!</font></div><div><font face=3D"arial, sans-=
serif"><br></font></div><div><font face=3D"arial, sans-serif">Cheers,</font=
></div><div><font face=3D"arial, sans-serif">Greg</font></div></div>
</blockquote></div><br></div>

--f46d043bdff836b6840507891565--


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From: "Aissaoui, Mustapha (Mustapha)" <mustapha.aissaoui@alcatel-lucent.com>
To: "Rajiv Asati (rajiva)" <rajiva@cisco.com>, "Dutta, Pranjal K (Pranjal)" <pranjal.dutta@alcatel-lucent.com>
Thread-Topic: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc closed)
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Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc closed)
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Hi Rajiv,
We did not properly close this discussion and I noticed the draft was updat=
ed to use the dual-stack capability TLV in Hellos as a way to discover the =
LDP peer capability of handling IPv6 FECs and IPv6 addresses.

I am very surprised that we are deviating from the main LDP mechanism which=
 is the LDP capability as per RFC 5561. Furthermore, we only needed to disc=
over the IPv6 FEC and IPv6 address capabilities at the session level and no=
t at the Hello adjacency level. There is nothing which is specific to the a=
djacency here.

The dual-stack capability TLV has nothing to do with the FEC and address ca=
pability of an LSR, it is simply a way to handle preference for the control=
 plane establishment of the Hello adjacency. It is not a good precedent tha=
t this would be overloaded to indicate FEC and address capability advertise=
ment which is orthogonal to adjacency establishment.

I strongly believe that we simply needed to use the existing IPv6 capabilit=
y described in draft-ietf-mpls-ldp-ip-pw-capability,  which is extension of=
 LDP capabilities defined in RFC 5561. We could also define another capabil=
ity for the IPv6 addresses in that same draft if really required but I do n=
ot think we needed to. There needs to be only one method to do one thing an=
d draft-ietf-mpls-ldp-ip-pw-capability is the way to go  for any IPv6 FEC r=
elated =93session=94 capabilities.

To re-iterate, here is the proposal I made. Implementations complying to th=
is draft must advertise the IPv6 prefix state advertisement control capabil=
ity (draft-ietf-mpls-ldp-ip-pw-capability) in the initialization message ex=
plicitly indicating support for LDP IPv6 FEC. Without the peer advertising =
this capability, an LSR must not send IPv6 addresses and IPv6 FECs to that =
peer.

There was one individual support for this proposal on this mailing list and=
 I thus consider the discussion was not properly closed.

Regards,
Mustapha.

From: Dutta, Pranjal K (Pranjal)
Sent: Tuesday, September 02, 2014 5:33 PM
To: Aissaoui, Mustapha (Mustapha); Rajiv Asati (rajiva)
Cc: Ross Callon; mpls@ietf.org<mailto:mpls@ietf.org>; mpls-chairs@tools.iet=
f.org<mailto:mpls-chairs@tools.ietf.org>; draft-ietf-mpls-ldp-ipv6@tools.ie=
tf.org<mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org>
Subject: RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc cl=
osed)


I second to Mustapha. We should use features for what they are designed for=
. It is the SAC capability (draft-ietf-mpls-ldp-ip-pw-capability-07) that d=
efines the negotiation of IPV4/IPV6 Prefix FEC Capabilities in LDP session,=
 which fits into the required inter-op solution organically.



I do not consider explicit advertisement of IPv6 Prefix FEC SAC (D =3D 0) i=
n Initialization message can be seen as baggage. An implementation that doe=
s not want to receive IPv6 Prefix FECs will send D=3D1 in Initialization me=
ssage anyways.



Cheers,

Pranjal



-----Original Message-----
From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Aissaoui, Mustapha (=
Mustapha)
Sent: Tuesday, September 02, 2014 11:57 AM
To: Rajiv Asati (rajiva)
Cc: Ross Callon; mpls@ietf.org<mailto:mpls@ietf.org>; mpls-chairs@tools.iet=
f.org<mailto:mpls-chairs@tools.ietf.org>; draft-ietf-mpls-ldp-ipv6@tools.ie=
tf.org<mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org>
Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc cl=
osed)



Hi Rajiv,

I think the key point I am trying to convey is that we should keep the prot=
ocol clean and use features for what they are designed for. LDP has its own=
 capability advertisement and it is meant to address issues like this one.



Overloading the TR field of the initialization message means that a peer wi=
ll have to check both the TR and the SAC to decide what to do for the IPv6 =
prefix FEC while it is sufficient to check the SAC for all other FEC types.=
 This is inconsistent and will cause an unnecessary exception in the protoc=
ol.



Also, using the LDP advertisement capability is not a baggage in the future=
. This mechanism is used with mLDP P2P and MP2MP FECs and this is working f=
ine today although many implementations now support these types of FECs.



As for changing other drafts, we are simply talking about stating in draft-=
ietf-mpls-ldp-ip-pw-capability-07 that an LDP peer must set D-bit=3D0  in I=
Pv6 prefix FEC SAC in the initialization message.



Regards,

Mustapha.



> -----Original Message-----

> From: Rajiv Asati (rajiva) [mailto:rajiva@cisco.com]

> Sent: Saturday, August 30, 2014 7:19 AM

> To: Aissaoui, Mustapha (Mustapha)

> Cc: Ross Callon; mpls@ietf.org<mailto:mpls@ietf.org>; mpls-chairs@tools.i=
etf.org<mailto:mpls-chairs@tools.ietf.org>;

> draft-ietf-mpls-ldp- ipv6@tools.ietf.org<mailto:ipv6@tools.ietf.org>

> Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short

> wglc closed)

>

> Hi Mustapha,

>

> TR field is useful in case of dual-stack environment and using it for

> determining whether the peer implementation is compliant (wrt handling

> v6 address bindings and label bindings) is simple and straight forward.

>

> When v6-only peer implementations exist (and become a new norm), TR

> field usage would become moot. And we wouldn't have to see them. A

> very good thing, IMO.

>

> We need to think about how much of this baggage needs to carry over

> when single- stack ipv6 networks become a new norm (like single-stack ipv=
4 has been).

>

> Given that this draft already has built-in means to accommodate the

> RFC5036 non- compliant peer issue and do so in a simple manner, it is

> not necessary to require changing other drafts, IMO.

>

>

> Cheers,

> Raj

>

>

> PS; While there are multiple types of FECs, and it would be wise to

> dictate the default behavior (v6 FECs advertised) in v6-only

> environment with an option to change it. This is nothing different from c=
urrent protocol machinery.

>

>

> > On Aug 29, 2014, at 8:25 PM, "Aissaoui, Mustapha (Mustapha)"

> <mustapha.aissaoui@alcatel-lucent .com<mailto:mustapha.aissaoui@alcatel-l=
ucent%20.com>> wrote:

> >

> > Hi Rajiv,

> > See inline below for some follow-up.

> >

> > Regards,

> > Mustapha.

> >

> >> -----Original Message-----

> >> From: Rajiv Asati (rajiva) [mailto:rajiva@cisco.com]

> >> Sent: Wednesday, August 27, 2014 7:19 PM

> >> To: Ross Callon; Aissaoui, Mustapha (Mustapha); mpls@ietf.org<mailto:m=
pls@ietf.org>

> >> Cc: mpls-chairs@tools.ietf.org<mailto:mpls-chairs@tools.ietf.org>;

> >> draft-ietf-mpls-ldp-ipv6@tools.ietf.org<mailto:draft-ietf-mpls-ldp-ipv=
6@tools.ietf.org>

> >> Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short

> >> wglc closed)

> >>

> >>

> >> If this draft were to address the interoperability with rfc5036

> >> non-compliant implementations, then it would be easier to rather

> >> leverage the =8Ctransport preference=B9 TLV that is already part of th=
e version 13.

> >> This TLV was defined after the getting Adrian's and George=B9s feedbac=
k.

> >>

> >> http://tools.ietf.org/html/draft-ietf-mpls-ldp-ipv6-13#section-6.1.

> >> 1

> > MA> It is not a good idea to overload this new TLV with a capability

> > MA> advertisement

> role. LDP has its own capability advertisement mechanism and there is

> no need to confuse implementations with the handling of two mechanisms.

> >

> >> The reason for not agreeing to the alternate solution (of using IP

> >> Prefix capability

> >> etc.) is 2-fold:

> >>

> >> - not forward compatible (consider a deployment 5 yrs from now -

> >> IPv6-only MPLS network - now, the LSR will be expecting an

> >> unnecessary IPv6 prefix capability advertisement, and that=B9s not

> >> optimal, if not annoying)

> > MA> IPv6-only network is not synonymous with a single FEC type

> > MA> network. It will

> support many types of FECs  in addition to the IPv6 prefix FEC: mLDP

> IPv6 FECs, PW FECs, IPv4 prefix FEC, etc. The LDP capabilities have

> been designed for the purpose of explicitly enabling or disabling

> capabilities including FEC type support on a given session.

> >

> >> - not 100% backward compatible (does not solve the advertisement of

> >> v6 address binding to a v4 neighbor (which can also cause an outage

> >> to a non-compliant peer))

> > MA> I think it makes sense to tie the exchange of both IPv6 address

> > MA> messages

> and IPv6 prefix FECs to the advertisement of the IPv6 capability by

> both peers. If however there is a use case for decoupling the

> advertising of IPv6 addresses from

> IPv6 FECs, then a separate capability can be devised for addresses but

> I do not think we need it.

> >

> >

> >> Thanks.

> >>

> >>

> >> --

> >> Cheers,

> >> Rajiv Asati

> >> Distinguished Engineer, Cisco

> >>

> >>

> >>

> >>

> >>

> >> -----Original Message-----

> >> From: Ross Callon <rcallon@juniper.net<mailto:rcallon@juniper.net>>

> >> Date: Friday, August 22, 2014 at 4:34 PM

> >> To: Mustapha Aissaoui <mustapha.aissaoui@alcatel-lucent.com<mailto:mus=
tapha.aissaoui@alcatel-lucent.com>>,

> >> "mpls@ietf.org<mailto:mpls@ietf.org>" <mpls@ietf.org<mailto:mpls@ietf.=
org>>

> >> Cc: "mpls-chairs@tools.ietf.org<mailto:mpls-chairs@tools.ietf.org>" <m=
pls-chairs@tools.ietf.org<mailto:mpls-chairs@tools.ietf.org>>,

> >> "draft-ietf-mpls-ldp-ipv6@tools.ietf.org<mailto:draft-ietf-mpls-ldp-ip=
v6@tools.ietf.org>"

> >> <draft-ietf-mpls-ldp-ipv6@tools.ietf.org<mailto:draft-ietf-mpls-ldp-ip=
v6@tools.ietf.org>>

> >> Subject: RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short

> >> wglc

> >> closed)

> >> Resent-From: <draft-alias-bounces@tools.ietf.org<mailto:draft-alias-bo=
unces@tools.ietf.org>>

> >> Resent-To: Carlos Pignataro <cpignata@cisco.com<mailto:cpignata@cisco.=
com>>, Rajiv Papneja

> >> <rajiv.papneja@huawei.com<mailto:rajiv.papneja@huawei.com>>, Rajiv Asa=
ti <rajiva@cisco.com<mailto:rajiva@cisco.com>>, Vishwas

> >> Manral <vishwas.manral@hp.com<mailto:vishwas.manral@hp.com>>, <swallow=
@cisco.com<mailto:swallow@cisco.com>>, Loa Andersson

> >> <loa@pi.nu<mailto:loa@pi.nu>>, Ross Callon <rcallon@juniper.net<mailto=
:rcallon@juniper.net>>, MARTIN VIGOUREUX

> >> <martin.vigoureux@alcatel-lucent.com<mailto:martin.vigoureux@alcatel-l=
ucent.com>>

> >> Resent-Date: Friday, August 22, 2014 at 4:35 PM

> >>

> >>>> The proposed solution is to have implementations complying to

> >>>> this draft advertise the IPv6 prefix state advertisement control

> >>>> capability

> >>>> (draft-ietf-mpls-ldp-ip-pw-capability-07) in the initialization

> >>>> message explicitly indicating support for LDP IPv6. Without the

> >>>> peer advertising this capability, an LSR must not send IPv6

> >>>> addresses and FECs to that peer.

> >>>

> >>> Speaking as an individual contributor, this seems IMHO to be the

> >>> right solution (noting that, in final text as would be published

> >>> in an RFC, the "must not" in the last sentence should be capitalized)=
.

> >>>

> >>> Thanks, Ross

> >>>

> >>> -----Original Message-----

> >>> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Aissaoui,

> >>> Mustapha

> >>> (Mustapha)

> >>> Sent: Tuesday, August 19, 2014 3:19 AM

> >>> To: mpls@ietf.org<mailto:mpls@ietf.org>

> >>> Cc: mpls-chairs@tools.ietf.org<mailto:mpls-chairs@tools.ietf.org>;

> >>> draft-ietf-mpls-ldp-ipv6@tools.ietf.org<mailto:draft-ietf-mpls-ldp-ip=
v6@tools.ietf.org>

> >>> Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6

> >>> (short wglc

> >>> closed)

> >>>

> >>> Dear all,

> >>> The following are the details of the issue we found and the

> >>> proposed solution. We shared this first with the authors to get initi=
al feedback.

> >>>

> >>> When an LSR which supports LDP IPv6 according to this draft is in

> >>> a LAN with a broadcast interface, it can peer with LSRs which

> >>> support this draft and LSRs which do not. When it peers using IPv4

> >>> LDP control plane with an LSR which does not support this draft,

> >>> we have seen during our testing an issue that the advertisement of

> >>> IPv6 addresses or IPv6 FECs to that peer will cause it to bring

> >>> down the IPv4 LDP

> session.

> >>>

> >>> In other words, there are deployed LDP implementations which are

> >>> compliant to RFC 5036 for LDP IPv4 but are not compliant to RFC

> >>> 5036 when it comes to handling IPv6 address or IPv6 FECs over an

> >>> LDP IPv4

> session.

> >>> This is making us very concerned that when users enable dual-stack

> >>> LDP IPv4/IPv6, they will bring down LDP IPv4 sessions which have

> >>> been working in a multi-vendor environments for so many years.

> >>>

> >>> The proposed solution is to have implementations complying to this

> >>> draft advertise the IPv6 prefix state advertisement control

> >>> capability

> >>> (draft-ietf-mpls-ldp-ip-pw-capability-07) in the initialization

> >>> message explicitly indicating support for LDP IPv6. Without the

> >>> peer advertising this capability, an LSR must not send IPv6

> >>> addresses and FECs to that peer.

> >>>

> >>> This approach is safer and has been followed when mLDP FEC was

> >>> introduced as explained in Section 2.1 of RFC 6388. Also, this

> >>> does not introduce any new TLV to draft-ietf-mpls-ldp-ipv6. It

> >>> just makes the exchange of LDP IPv6 addresses and FECs conditional

> >>> to both peers explicitly indicating support for IPv6 capability

> >>> during LDP session

> initialization.

> >>>

> >>> We do not feel such a simple change justifies writing a new draft

> >>> and having to deal with backward compatibility of implementations

> >>> across two drafts.

> >>>

> >>> We appreciate your comments on this matter.

> >>>

> >>> Regards,

> >>> Mustapha.

> >>>

> >>>

> >>>> -----Original Message-----

> >>>> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa

> >>>> Andersson

> >>>> Sent: Tuesday, August 12, 2014 11:45 AM

> >>>> To: mpls@ietf.org<mailto:mpls@ietf.org>; mpls-chairs@tools.ietf.org<=
mailto:mpls-chairs@tools.ietf.org>;

> >>>> draft-ietf-mpls-ldp-ipv6@tools.ietf.org<mailto:draft-ietf-mpls-ldp-i=
pv6@tools.ietf.org>

> >>>> Subject: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short

> >>>> wglc

> >>>> closed)

> >>>>

> >>>> Working Group,

> >>>>

> >>>> During what we thought would be a short wglc on

> >>>> draft-ietf-mpls-ldp-ipv6

> >>>> http://www.ietf.org/mail-archive/web/mpls/current/msg12464.html

> >>>> we had a comment that stopped us from continuing progressing the dra=
ft.

> >>>>

> >>>> The short working group last call is now closed!

> >>>>

> >>>> The comment we refer to was raised in a private mail to the

> >>>> working group chairs and the draft authors.

> >>>>

> >>>> It says that there are a problem with some RFC 5036 non-compliant

> >>>> implementations deployed and draft-ietf-mpls-ldp-ipv6. There is

> >>>> no detailed description of the exact problems.

> >>>>

> >>>> We strongly encourage the people that made the comment(s) to

> >>>> write-up the problem, either as

> >>>>

> >>>> - a new draft (preferred); or

> >>>> - in a mail to the working group mailing list

> >>>>

> >>>> Once we an agreement to write a new draft or the write-up to the

> >>>> mailing, we will continue to ask the working group to see if we

> >>>> can agree to a way to progress. We like to see this write-up

> >>>> before September 1. Failing this we will continue to progress the

> >>>> draft-ietf-mpls-ldp-ipv6 as is.

> >>>>

> >>>> /Loa

> >>>> for the working group chairs

> >>>> --

> >>>>

> >>>>

> >>>> Loa Andersson                        email: loa@mail01.huawei.com<ma=
ilto:loa@mail01.huawei.com>

> >>>> Senior MPLS Expert                          loa@pi.nu<mailto:loa@pi.=
nu>

> >>>> Huawei Technologies (consultant)     phone: +46 739 81 21 64

> >>>>

> >>>> _______________________________________________

> >>>> mpls mailing list

> >>>> mpls@ietf.org<mailto:mpls@ietf.org>

> >>>> https://www.ietf.org/mailman/listinfo/mpls

> >>>

> >>> _______________________________________________

> >>> mpls mailing list

> >>> mpls@ietf.org<mailto:mpls@ietf.org>

> >>> https://www.ietf.org/mailman/listinfo/mpls

> >



_______________________________________________

mpls mailing list

mpls@ietf.org<mailto:mpls@ietf.org>

https://www.ietf.org/mailman/listinfo/mpls

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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">Hi Rajiv,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">We did not properly close this discussion and I noticed th=
e draft was updated to use the dual-stack capability TLV in Hellos as a way=
 to discover the LDP peer capability of handling IPv6 FECs
 and IPv6 addresses. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">I am very surprised that we are deviating from the main LD=
P mechanism which is the LDP capability as per RFC 5561. Furthermore, we on=
ly needed to discover the IPv6 FEC and IPv6 address capabilities
 at the session level and not at the Hello adjacency level. There is nothin=
g which is specific to the adjacency here.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">The dual-stack capability TLV has nothing to do with the F=
EC and address capability of an LSR, it is simply a way to handle preferenc=
e for the control plane establishment of the Hello adjacency.
 It is not a good precedent that this would be overloaded to indicate FEC a=
nd address capability advertisement which is orthogonal to adjacency establ=
ishment.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">I strongly believe that we simply needed to use the existi=
ng IPv6 capability described in draft-ietf-mpls-ldp-ip-pw-capability,&nbsp;=
 which is extension of LDP capabilities defined in RFC 5561.
 We could also define another capability for the IPv6 addresses in that sam=
e draft if really required but I do not think we needed to. There needs to =
be only one method to do one thing and draft-ietf-mpls-ldp-ip-pw-capability=
 is the way to go&nbsp; for any IPv6
 FEC related =93session=94 capabilities.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">To re-iterate, here is the proposal I made. Implementation=
s complying to this draft must advertise the IPv6 prefix state advertisemen=
t control capability (draft-ietf-mpls-ldp-ip-pw-capability)
 in the initialization message explicitly indicating support for LDP IPv6 F=
EC. Without the peer advertising this capability, an LSR must not send IPv6=
 addresses and IPv6 FECs to that peer.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">There was one individual support for this proposal on this=
 mailing list and I thus consider the discussion was not properly closed.<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">Mustapha.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> Dutta, P=
ranjal K (Pranjal)
<br>
<b>Sent:</b> Tuesday, September 02, 2014 5:33 PM<br>
<b>To:</b> Aissaoui, Mustapha (Mustapha); Rajiv Asati (rajiva)<br>
<b>Cc:</b> Ross Callon; <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>;=
 <a href=3D"mailto:mpls-chairs@tools.ietf.org">
mpls-chairs@tools.ietf.org</a>; <a href=3D"mailto:draft-ietf-mpls-ldp-ipv6@=
tools.ietf.org">
draft-ietf-mpls-ldp-ipv6@tools.ietf.org</a><br>
<b>Subject:</b> RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short =
wglc closed)<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:12.0pt;font-family:&quot=
;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D">I second to Mustaph=
a. We should use features for what they are designed for. It is the SAC cap=
ability (draft-ietf-mpls-ldp-ip-pw-capability-07) that defines
 the negotiation of IPV4/IPV6 Prefix FEC Capabilities in LDP session, which=
 fits into the required inter-op solution organically.<o:p></o:p></span></p=
>
<p class=3D"MsoPlainText"><span style=3D"font-size:12.0pt;font-family:&quot=
;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:12.0pt;font-family:&quot=
;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D">I do not consider e=
xplicit advertisement of IPv6 Prefix FEC SAC (D =3D 0) in Initialization me=
ssage can be seen as baggage. An implementation that does
 not want to receive IPv6 Prefix FECs will send D=3D1 in Initialization mes=
sage anyways.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:12.0pt;font-family:&quot=
;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D">Cheers,<o:p></o:p><=
/span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:12.0pt;font-family:&quot=
;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D">Pranjal<o:p></o:p><=
/span></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">-----Original Message-----<br>
From: mpls [<a href=3D"mailto:mpls-bounces@ietf.org">mailto:mpls-bounces@ie=
tf.org</a>] On Behalf Of Aissaoui, Mustapha (Mustapha)<br>
Sent: Tuesday, September 02, 2014 11:57 AM<br>
To: Rajiv Asati (rajiva)<br>
Cc: Ross Callon; <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>; <a hre=
f=3D"mailto:mpls-chairs@tools.ietf.org">
mpls-chairs@tools.ietf.org</a>; <a href=3D"mailto:draft-ietf-mpls-ldp-ipv6@=
tools.ietf.org">
draft-ietf-mpls-ldp-ipv6@tools.ietf.org</a><br>
Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc cl=
osed)<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Hi Rajiv,<o:p></o:p></p>
<p class=3D"MsoPlainText">I think the key point I am trying to convey is th=
at we should keep the protocol clean and use features for what they are des=
igned for. LDP has its own capability advertisement and it is meant to addr=
ess issues like this one.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Overloading the TR field of the initialization me=
ssage means that a peer will have to check both the TR and the SAC to decid=
e what to do for the IPv6 prefix FEC while it is sufficient to check the SA=
C for all other FEC types. This is
 inconsistent and will cause an unnecessary exception in the protocol.<o:p>=
</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Also, using the LDP advertisement capability is n=
ot a baggage in the future. This mechanism is used with mLDP P2P and MP2MP =
FECs and this is working fine today although many implementations now suppo=
rt these types of FECs.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">As for changing other drafts, we are simply talki=
ng about stating in draft-ietf-mpls-ldp-ip-pw-capability-07 that an LDP pee=
r must set D-bit=3D0&nbsp; in IPv6 prefix FEC SAC in the initialization mes=
sage.
<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Regards,<o:p></o:p></p>
<p class=3D"MsoPlainText">Mustapha.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&gt; -----Original Message-----<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; From: Rajiv Asati (rajiva) [<a href=3D"mailt=
o:rajiva@cisco.com"><span style=3D"color:windowtext;text-decoration:none">m=
ailto:rajiva@cisco.com</span></a>]<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Sent: Saturday, August 30, 2014 7:19 AM<o:p>=
</o:p></p>
<p class=3D"MsoPlainText">&gt; To: Aissaoui, Mustapha (Mustapha)<o:p></o:p>=
</p>
<p class=3D"MsoPlainText">&gt; Cc: Ross Callon; <a href=3D"mailto:mpls@ietf=
.org"><span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</=
span></a>;
<a href=3D"mailto:mpls-chairs@tools.ietf.org"><span style=3D"color:windowte=
xt;text-decoration:none">mpls-chairs@tools.ietf.org</span></a>;
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; draft-ietf-mpls-ldp- <a href=3D"mailto:ipv6@=
tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">ipv6@tools.ietf.org</=
span></a><o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Subject: Re: [mpls] Way to progress draft-ie=
tf-mpls-ldp-ipv6 (short
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; wglc closed)<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Hi Mustapha,<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; TR field is useful in case of dual-stack env=
ironment and using it for
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; determining whether the peer implementation =
is compliant (wrt handling
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; v6 address bindings and label bindings) is s=
imple and straight forward.<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; When v6-only peer implementations exist (and=
 become a new norm), TR
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; field usage would become moot. And we wouldn=
't have to see them. A
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; very good thing, IMO.<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; We need to think about how much of this bagg=
age needs to carry over
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; when single- stack ipv6 networks become a ne=
w norm (like single-stack ipv4 has been).<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Given that this draft already has built-in m=
eans to accommodate the
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; RFC5036 non- compliant peer issue and do so =
in a simple manner, it is
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; not necessary to require changing other draf=
ts, IMO.<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Cheers,<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Raj<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; PS; While there are multiple types of FECs, =
and it would be wise to
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; dictate the default behavior (v6 FECs advert=
ised) in v6-only
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; environment with an option to change it. Thi=
s is nothing different from current protocol machinery.<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt; On Aug 29, 2014, at 8:25 PM, &quot;Aiss=
aoui, Mustapha (Mustapha)&quot;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &lt;<a href=3D"mailto:mustapha.aissaoui@alca=
tel-lucent%20.com"><span style=3D"color:windowtext;text-decoration:none">mu=
stapha.aissaoui@alcatel-lucent .com</span></a>&gt; wrote:<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt; Hi Rajiv,<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt; See inline below for some follow-up.<o:=
p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt; Regards,<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt; Mustapha.<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; -----Original Message-----<o:p></o:=
p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; From: Rajiv Asati (rajiva) [<a href=
=3D"mailto:rajiva@cisco.com"><span style=3D"color:windowtext;text-decoratio=
n:none">mailto:rajiva@cisco.com</span></a>]<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; Sent: Wednesday, August 27, 2014 7:=
19 PM<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; To: Ross Callon; Aissaoui, Mustapha=
 (Mustapha); <a href=3D"mailto:mpls@ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</span><=
/a><o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; Cc: <a href=3D"mailto:mpls-chairs@t=
ools.ietf.org"><span style=3D"color:windowtext;text-decoration:none">mpls-c=
hairs@tools.ietf.org</span></a>;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; <a href=3D"mailto:draft-ietf-mpls-l=
dp-ipv6@tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">draft-ietf-mpls-ldp-i=
pv6@tools.ietf.org</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; Subject: Re: [mpls] Way to progress=
 draft-ietf-mpls-ldp-ipv6 (short
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; wglc closed)<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; If this draft were to address the i=
nteroperability with rfc5036
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; non-co=
mpliant implementations, then it would be easier to rather
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; levera=
ge the =8Ctransport preference=B9 TLV that is already part of the version 1=
3.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; This T=
LV was defined after the getting Adrian's and George=B9s feedback.<o:p></o:=
p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; <a hre=
f=3D"http://tools.ietf.org/html/draft-ietf-mpls-ldp-ipv6-13#section-6.1">
<span style=3D"color:windowtext;text-decoration:none">http://tools.ietf.org=
/html/draft-ietf-mpls-ldp-ipv6-13#section-6.1</span></a>.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; 1<o:p>=
</o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; It =
is not a good idea to overload this new TLV with a capability
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; adv=
ertisement<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; role. LDP has i=
ts own capability advertisement mechanism and there is
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; no need to conf=
use implementations with the handling of two mechanisms.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;<o:p></o:p>=
</p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; The re=
ason for not agreeing to the alternate solution (of using IP
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Prefix=
 capability<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; etc.) =
is 2-fold:<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; - not =
forward compatible (consider a deployment 5 yrs from now -
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; IPv6-o=
nly MPLS network - now, the LSR will be expecting an
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; unnece=
ssary IPv6 prefix capability advertisement, and that=B9s not
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; optima=
l, if not annoying)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; IPv=
6-only network is not synonymous with a single FEC type
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; net=
work. It will<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; support many ty=
pes of FECs&nbsp; in addition to the IPv6 prefix FEC: mLDP
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt"><span lang=3D"FR-CA"=
>&gt; IPv6 FECs, PW FECs, IPv4 prefix FEC, etc.
</span>The LDP capabilities have <o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; been designed f=
or the purpose of explicitly enabling or disabling
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; capabilities in=
cluding FEC type support on a given session.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;<o:p></o:p>=
</p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; - not =
100% backward compatible (does not solve the advertisement of<o:p></o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; v6 add=
ress binding to a v4 neighbor (which can also cause an outage
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; to a n=
on-compliant peer))<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; I t=
hink it makes sense to tie the exchange of both IPv6 address
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; mes=
sages<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; and IPv6 prefix=
 FECs to the advertisement of the IPv6 capability by
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; both peers. If =
however there is a use case for decoupling the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; advertising of =
IPv6 addresses from<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; IPv6 FECs, then=
 a separate capability can be devised for addresses but
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; I do not think =
we need it.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;<o:p></o:p>=
</p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;<o:p></o:p>=
</p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Thanks=
.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; --<o:p=
></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Cheers=
,<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Rajiv =
Asati<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Distin=
guished Engineer, Cisco<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; -----O=
riginal Message-----<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; From: =
Ross Callon &lt;<a href=3D"mailto:rcallon@juniper.net"><span style=3D"color=
:windowtext;text-decoration:none">rcallon@juniper.net</span></a>&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Date: =
Friday, August 22, 2014 at 4:34 PM<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; To: Mu=
stapha Aissaoui &lt;<a href=3D"mailto:mustapha.aissaoui@alcatel-lucent.com"=
><span style=3D"color:windowtext;text-decoration:none">mustapha.aissaoui@al=
catel-lucent.com</span></a>&gt;,<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; &quot;=
<a href=3D"mailto:mpls@ietf.org"><span style=3D"color:windowtext;text-decor=
ation:none">mpls@ietf.org</span></a>&quot; &lt;<a href=3D"mailto:mpls@ietf.=
org"><span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</s=
pan></a>&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Cc: &q=
uot;<a href=3D"mailto:mpls-chairs@tools.ietf.org"><span style=3D"color:wind=
owtext;text-decoration:none">mpls-chairs@tools.ietf.org</span></a>&quot; &l=
t;<a href=3D"mailto:mpls-chairs@tools.ietf.org"><span style=3D"color:window=
text;text-decoration:none">mpls-chairs@tools.ietf.org</span></a>&gt;,
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; &quot;=
<a href=3D"mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org"><span style=3D"c=
olor:windowtext;text-decoration:none">draft-ietf-mpls-ldp-ipv6@tools.ietf.o=
rg</span></a>&quot;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; &lt;<a=
 href=3D"mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org"><span style=3D"col=
or:windowtext;text-decoration:none">draft-ietf-mpls-ldp-ipv6@tools.ietf.org=
</span></a>&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Subjec=
t: RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; wglc<o=
:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; closed=
)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Resent=
-From: &lt;<a href=3D"mailto:draft-alias-bounces@tools.ietf.org"><span styl=
e=3D"color:windowtext;text-decoration:none">draft-alias-bounces@tools.ietf.=
org</span></a>&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Resent=
-To: Carlos Pignataro &lt;<a href=3D"mailto:cpignata@cisco.com"><span style=
=3D"color:windowtext;text-decoration:none">cpignata@cisco.com</span></a>&gt=
;, Rajiv Papneja
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; &lt;<a=
 href=3D"mailto:rajiv.papneja@huawei.com"><span style=3D"color:windowtext;t=
ext-decoration:none">rajiv.papneja@huawei.com</span></a>&gt;, Rajiv Asati &=
lt;<a href=3D"mailto:rajiva@cisco.com"><span style=3D"color:windowtext;text=
-decoration:none">rajiva@cisco.com</span></a>&gt;,
 Vishwas <o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Manral=
 &lt;<a href=3D"mailto:vishwas.manral@hp.com"><span style=3D"color:windowte=
xt;text-decoration:none">vishwas.manral@hp.com</span></a>&gt;, &lt;<a href=
=3D"mailto:swallow@cisco.com"><span style=3D"color:windowtext;text-decorati=
on:none">swallow@cisco.com</span></a>&gt;,
 Loa Andersson <o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt"><span lang=3D"FR-CA"=
>&gt; &gt;&gt; &lt;</span><a href=3D"mailto:loa@pi.nu"><span lang=3D"FR-CA"=
 style=3D"color:windowtext;text-decoration:none">loa@pi.nu</span></a><span =
lang=3D"FR-CA">&gt;, Ross Callon &lt;</span><a href=3D"mailto:rcallon@junip=
er.net"><span lang=3D"FR-CA" style=3D"color:windowtext;text-decoration:none=
">rcallon@juniper.net</span></a><span lang=3D"FR-CA">&gt;,
 MARTIN VIGOUREUX <o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt"><span lang=3D"FR-CA"=
>&gt; &gt;&gt; &lt;</span><a href=3D"mailto:martin.vigoureux@alcatel-lucent=
.com"><span lang=3D"FR-CA" style=3D"color:windowtext;text-decoration:none">=
martin.vigoureux@alcatel-lucent.com</span></a><span lang=3D"FR-CA">&gt;<o:p=
></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Resent=
-Date: Friday, August 22, 2014 at 4:35 PM<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; The proposed solution is to have implementations complying to
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; this draft advertise the IPv6 prefix state advertisement control
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; capability<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; (draft-ietf-mpls-ldp-ip-pw-capability-07) in the initialization
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; message explicitly indicating support for LDP IPv6. Without the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; peer advertising this capability, an LSR must not send IPv6
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; addresses and FECs to that peer.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Sp=
eaking as an individual contributor, this seems IMHO to be the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; ri=
ght solution (noting that, in final text as would be published
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; in=
 an RFC, the &quot;must not&quot; in the last sentence should be capitalize=
d).<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Th=
anks, Ross<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; --=
---Original Message-----<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Fr=
om: mpls [<a href=3D"mailto:mpls-bounces@ietf.org"><span style=3D"color:win=
dowtext;text-decoration:none">mailto:mpls-bounces@ietf.org</span></a>] On B=
ehalf Of Aissaoui,
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Mu=
stapha<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; (M=
ustapha)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Se=
nt: Tuesday, August 19, 2014 3:19 AM<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; To=
: <a href=3D"mailto:mpls@ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</span><=
/a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Cc=
: <a href=3D"mailto:mpls-chairs@tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls-chairs@tools.iet=
f.org</span></a>;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; <a=
 href=3D"mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">draft-ietf-mpls-ldp-i=
pv6@tools.ietf.org</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Su=
bject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; (s=
hort wglc<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; cl=
osed)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; De=
ar all,<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Th=
e following are the details of the issue we found and the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; pr=
oposed solution. We shared this first with the authors to get initial feedb=
ack.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Wh=
en an LSR which supports LDP IPv6 according to this draft is in
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; a =
LAN with a broadcast interface, it can peer with LSRs which
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; su=
pport this draft and LSRs which do not. When it peers using IPv4
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; LD=
P control plane with an LSR which does not support this draft,
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; we=
 have seen during our testing an issue that the advertisement of
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; IP=
v6 addresses or IPv6 FECs to that peer will cause it to bring
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; do=
wn the IPv4 LDP<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; session.<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; In=
 other words, there are deployed LDP implementations which are
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; co=
mpliant to RFC 5036 for LDP IPv4 but are not compliant to RFC
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; 50=
36 when it comes to handling IPv6 address or IPv6 FECs over an
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; LD=
P IPv4<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; session.<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Th=
is is making us very concerned that when users enable dual-stack
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; LD=
P IPv4/IPv6, they will bring down LDP IPv4 sessions which have
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; be=
en working in a multi-vendor environments for so many years.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Th=
e proposed solution is to have implementations complying to this
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; dr=
aft advertise the IPv6 prefix state advertisement control
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; ca=
pability<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; (d=
raft-ietf-mpls-ldp-ip-pw-capability-07) in the initialization
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; me=
ssage explicitly indicating support for LDP IPv6. Without the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; pe=
er advertising this capability, an LSR must not send IPv6
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; ad=
dresses and FECs to that peer.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Th=
is approach is safer and has been followed when mLDP FEC was
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; in=
troduced as explained in Section 2.1 of RFC 6388. Also, this
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; do=
es not introduce any new TLV to draft-ietf-mpls-ldp-ipv6. It
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; ju=
st makes the exchange of LDP IPv6 addresses and FECs conditional
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; to=
 both peers explicitly indicating support for IPv6 capability
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; du=
ring LDP session<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; initialization.=
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; We=
 do not feel such a simple change justifies writing a new draft
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; an=
d having to deal with backward compatibility of implementations
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; ac=
ross two drafts.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; We=
 appreciate your comments on this matter.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Re=
gards,<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Mu=
stapha.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; -----Original Message-----<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; From: mpls [<a href=3D"mailto:mpls-bounces@ietf.org"><span style=3D"color=
:windowtext;text-decoration:none">mailto:mpls-bounces@ietf.org</span></a>] =
On Behalf Of Loa
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Andersson<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Sent: Tuesday, August 12, 2014 11:45 AM<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; To: <a href=3D"mailto:mpls@ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</span><=
/a>; <a href=3D"mailto:mpls-chairs@tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls-chairs@tools.iet=
f.org</span></a>;
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; <a href=3D"mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">draft-ietf-mpls-ldp-i=
pv6@tools.ietf.org</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Subject: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; wglc<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; closed)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Working Group,<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; During what we thought would be a short wglc on<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; draft-ietf-mpls-ldp-ipv6<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; <a href=3D"http://www.ietf.org/mail-archive/web/mpls/current/msg12464.htm=
l">
<span style=3D"color:windowtext;text-decoration:none">http://www.ietf.org/m=
ail-archive/web/mpls/current/msg12464.html</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; we had a comment that stopped us from continuing progressing the draft.<o=
:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; The short working group last call is now closed!<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; The comment we refer to was raised in a private mail to the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; working group chairs and the draft authors.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; It says that there are a problem with some RFC 5036 non-compliant
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; implementations deployed and draft-ietf-mpls-ldp-ipv6. There is
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; no detailed description of the exact problems.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; We strongly encourage the people that made the comment(s) to
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; write-up the problem, either as<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; - a new draft (preferred); or<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; - in a mail to the working group mailing list<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Once we an agreement to write a new draft or the write-up to the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; mailing, we will continue to ask the working group to see if we
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; can agree to a way to progress. We like to see this write-up
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; before September 1. Failing this we will continue to progress the<o:p></o=
:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; draft-ietf-mpls-ldp-ipv6 as is.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; /Loa<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; for the working group chairs<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; --<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Loa Andersson&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; email:
<a href=3D"mailto:loa@mail01.huawei.com"><span style=3D"color:windowtext;te=
xt-decoration:none">loa@mail01.huawei.com</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Senior MPLS Expert&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
<a href=3D"mailto:loa@pi.nu"><span style=3D"color:windowtext;text-decoratio=
n:none">loa@pi.nu</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Huawei Technologies (consultant)&nbsp;&nbsp;&nbsp;&nbsp; phone: &#43;46 7=
39 81 21 64<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; _______________________________________________<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; mpls mailing list<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; <a href=3D"mailto:mpls@ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</span><=
/a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; <a href=3D"https://www.ietf.org/mailman/listinfo/mpls">
<span style=3D"color:windowtext;text-decoration:none">https://www.ietf.org/=
mailman/listinfo/mpls</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; __=
_____________________________________________<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; mp=
ls mailing list<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; <a=
 href=3D"mailto:mpls@ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</span><=
/a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; <a=
 href=3D"https://www.ietf.org/mailman/listinfo/mpls">
<span style=3D"color:windowtext;text-decoration:none">https://www.ietf.org/=
mailman/listinfo/mpls</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;<o:p></o:p>=
</p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">____________________=
___________________________<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">mpls mailing list<o:=
p></o:p></p>
<p class=3D"MsoPlainText"><a href=3D"mailto:mpls@ietf.org"><span style=3D"c=
olor:windowtext;text-decoration:none">mpls@ietf.org</span></a><o:p></o:p></=
p>
<p class=3D"MsoPlainText"><a href=3D"https://www.ietf.org/mailman/listinfo/=
mpls"><span style=3D"color:windowtext;text-decoration:none">https://www.iet=
f.org/mailman/listinfo/mpls</span></a><o:p></o:p></p>
</div>
</div>
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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: "S. Davari" <davarish@yahoo.com>
Thread-Topic: [mpls] commnets on draft-kini-mpls-spring-entropy-label
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Date: Mon, 10 Nov 2014 23:55:09 +0000
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Subject: Re: [mpls] commnets on draft-kini-mpls-spring-entropy-label
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From: "Nobo Akiya (nobo)" <nobo@cisco.com>
To: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>, "S. Davari" <davarish@yahoo.com>
Thread-Topic: [mpls] commnets on draft-kini-mpls-spring-entropy-label
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Date: Tue, 11 Nov 2014 00:48:54 +0000
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Subject: Re: [mpls] commnets on draft-kini-mpls-spring-entropy-label
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--_000_CECE764681BE964CBE1DFF78F3CDD3943F522F42xmbalnx01ciscoc_--


From nobody Tue Nov 11 10:03:34 2014
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From: Loa Andersson <loa@pi.nu>
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Subject: Re: [mpls] commnets on draft-kini-mpls-spring-entropy-label
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Sharam,

Is this something that you think is applicabel to draft-kini-mpls-
spring-entropy-label only or to entropy labels in general?

/Loa

On 2014-11-10 21:45, S. Davari wrote:
> Hi Authors,
>
> As stated during this morning's IETF meeting, I wanted to suggest having
> an option to not use ELI to indicate EL and just signal having EL with
> the Tunnel Label. So existence of EL becomes a property of the Tunnel
> Label. This would reduce number of labels in the stack.
>
> Thanks
> Shahram
>
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>


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From: Shahram Davari <davari@broadcom.com>
To: Loa Andersson <loa@pi.nu>, "S. Davari" <davarish@yahoo.com>, "mpls@ietf.org" <mpls@ietf.org>
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Hi Loa,

It should be applicable to entropy label in general.=20

Thanks
Shahram

-----Original Message-----
From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson
Sent: Tuesday, November 11, 2014 10:03 AM
To: S. Davari; mpls@ietf.org
Subject: Re: [mpls] commnets on draft-kini-mpls-spring-entropy-label

Sharam,

Is this something that you think is applicabel to draft-kini-mpls-
spring-entropy-label only or to entropy labels in general?

/Loa

On 2014-11-10 21:45, S. Davari wrote:
> Hi Authors,
>
> As stated during this morning's IETF meeting, I wanted to suggest having
> an option to not use ELI to indicate EL and just signal having EL with
> the Tunnel Label. So existence of EL becomes a property of the Tunnel
> Label. This would reduce number of labels in the stack.
>
> Thanks
> Shahram
>
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

_______________________________________________
mpls mailing list
mpls@ietf.org
https://www.ietf.org/mailman/listinfo/mpls


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From: John E Drake <jdrake@juniper.net>
To: Shahram Davari <davari@broadcom.com>
Thread-Topic: [mpls] commnets on draft-kini-mpls-spring-entropy-label
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Subject: Re: [mpls] commnets on draft-kini-mpls-spring-entropy-label
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Shahram,

Given that not all ingresses support EL and that there is no signaling betw=
een a given ingress and the egress regarding EL, how is the egress to know =
whether a given packet contains an EL?

Sent from my iPhone

> On Nov 11, 2014, at 9:15 AM, Shahram Davari <davari@broadcom.com> wrote:
>=20
> Hi Loa,
>=20
> It should be applicable to entropy label in general.=20
>=20
> Thanks
> Shahram
>=20
> -----Original Message-----
> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson
> Sent: Tuesday, November 11, 2014 10:03 AM
> To: S. Davari; mpls@ietf.org
> Subject: Re: [mpls] commnets on draft-kini-mpls-spring-entropy-label
>=20
> Sharam,
>=20
> Is this something that you think is applicabel to draft-kini-mpls-
> spring-entropy-label only or to entropy labels in general?
>=20
> /Loa
>=20
>> On 2014-11-10 21:45, S. Davari wrote:
>> Hi Authors,
>>=20
>> As stated during this morning's IETF meeting, I wanted to suggest having
>> an option to not use ELI to indicate EL and just signal having EL with
>> the Tunnel Label. So existence of EL becomes a property of the Tunnel
>> Label. This would reduce number of labels in the stack.
>>=20
>> Thanks
>> Shahram
>>=20
>>=20
>> _______________________________________________
>> mpls mailing list
>> mpls@ietf.org
>> https://www.ietf.org/mailman/listinfo/mpls
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls


From nobody Tue Nov 11 11:32:57 2014
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Date: Tue, 11 Nov 2014 20:32:52 +0100
From: Loa Andersson <loa@pi.nu>
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Subject: Re: [mpls] commnets on draft-kini-mpls-spring-entropy-label
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Sharam,

Then it is not a discussion that is hinged on the draft-kini-mpls-
spring-entropy-label. I will now go ahead and start the wg adoption
poll on the draft.

/Loa

On 2014-11-11 20:15, Shahram Davari wrote:
> Hi Loa,
>
> It should be applicable to entropy label in general.
>
> Thanks
> Shahram
>
> -----Original Message-----
> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson
> Sent: Tuesday, November 11, 2014 10:03 AM
> To: S. Davari; mpls@ietf.org
> Subject: Re: [mpls] commnets on draft-kini-mpls-spring-entropy-label
>
> Sharam,
>
> Is this something that you think is applicabel to draft-kini-mpls-
> spring-entropy-label only or to entropy labels in general?
>
> /Loa
>
> On 2014-11-10 21:45, S. Davari wrote:
>> Hi Authors,
>>
>> As stated during this morning's IETF meeting, I wanted to suggest having
>> an option to not use ELI to indicate EL and just signal having EL with
>> the Tunnel Label. So existence of EL becomes a property of the Tunnel
>> Label. This would reduce number of labels in the stack.
>>
>> Thanks
>> Shahram
>>
>>
>> _______________________________________________
>> mpls mailing list
>> mpls@ietf.org
>> https://www.ietf.org/mailman/listinfo/mpls
>>
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


From nobody Tue Nov 11 11:36:19 2014
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From: Shahram Davari <davari@broadcom.com>
To: Loa Andersson <loa@pi.nu>, "S. Davari" <davarish@yahoo.com>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] commnets on draft-kini-mpls-spring-entropy-label
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Subject: Re: [mpls] commnets on draft-kini-mpls-spring-entropy-label
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Hi Loa,

Although it is a general comment, but it is more exemplified in this draft =
since it proposes adding multiple EL in the stack making the stack very lar=
ge.

Thx
SD

-----Original Message-----
From: Loa Andersson [mailto:loa@pi.nu]=20
Sent: Tuesday, November 11, 2014 11:33 AM
To: Shahram Davari; S. Davari; mpls@ietf.org
Subject: Re: [mpls] commnets on draft-kini-mpls-spring-entropy-label

Sharam,

Then it is not a discussion that is hinged on the draft-kini-mpls-
spring-entropy-label. I will now go ahead and start the wg adoption
poll on the draft.

/Loa

On 2014-11-11 20:15, Shahram Davari wrote:
> Hi Loa,
>
> It should be applicable to entropy label in general.
>
> Thanks
> Shahram
>
> -----Original Message-----
> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson
> Sent: Tuesday, November 11, 2014 10:03 AM
> To: S. Davari; mpls@ietf.org
> Subject: Re: [mpls] commnets on draft-kini-mpls-spring-entropy-label
>
> Sharam,
>
> Is this something that you think is applicabel to draft-kini-mpls-
> spring-entropy-label only or to entropy labels in general?
>
> /Loa
>
> On 2014-11-10 21:45, S. Davari wrote:
>> Hi Authors,
>>
>> As stated during this morning's IETF meeting, I wanted to suggest having
>> an option to not use ELI to indicate EL and just signal having EL with
>> the Tunnel Label. So existence of EL becomes a property of the Tunnel
>> Label. This would reduce number of labels in the stack.
>>
>> Thanks
>> Shahram
>>
>>
>> _______________________________________________
>> mpls mailing list
>> mpls@ietf.org
>> https://www.ietf.org/mailman/listinfo/mpls
>>
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

--=20


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


From nobody Tue Nov 11 11:46:40 2014
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Subject: [mpls] poll to se if we have consensus to make draft-kini-mpls-spring-entropy-label an mpls wg document
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Working Group,

This is to start a two week poll on adopting
draft-kini-mpls-spring-entropy-label as an MPLS working group document.

Please send your comments (support/not support) to the mpls working
group mailing list (mpls@ietf.org). Please give a technical
motivation for your support/not support, especially if you think that
the document should not be adopted as a working group document.

There is no IPR disclosures directly against this document.

The authors has all stated on the working group mailing
list that they are unaware of any IPR claims against this draft.

However we have an outstanding issue on IPRs. There were more than
one solution to entropy labels for spring, they are referenced in the
document, but are labeled as "discounted". One of these proposed
had an IPR disclosure.

However if you are on the the mpls working group mailing list and
aware of IPR that relates to this draft, the time to disclose
this is now.

This poll ends November 25, 2014.

/Loa
-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


From nobody Tue Nov 11 11:47:13 2014
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From: Shahram Davari <davari@broadcom.com>
To: John E Drake <jdrake@juniper.net>
Thread-Topic: [mpls] commnets on draft-kini-mpls-spring-entropy-label
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Date: Tue, 11 Nov 2014 19:47:03 +0000
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Subject: Re: [mpls] commnets on draft-kini-mpls-spring-entropy-label
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HI John,

We could add the EL presence to the Label distribution signaling, similar t=
o PW FAT label. I think  adding an EL indicator  to the signaling is prefer=
red compared to increasing the Label stack depth.

Thx
Shahram

-----Original Message-----
From: John E Drake [mailto:jdrake@juniper.net]=20
Sent: Tuesday, November 11, 2014 11:27 AM
To: Shahram Davari
Cc: Loa Andersson; S. Davari; mpls@ietf.org
Subject: Re: [mpls] commnets on draft-kini-mpls-spring-entropy-label

Shahram,

Given that not all ingresses support EL and that there is no signaling betw=
een a given ingress and the egress regarding EL, how is the egress to know =
whether a given packet contains an EL?

Sent from my iPhone

> On Nov 11, 2014, at 9:15 AM, Shahram Davari <davari@broadcom.com> wrote:
>=20
> Hi Loa,
>=20
> It should be applicable to entropy label in general.=20
>=20
> Thanks
> Shahram
>=20
> -----Original Message-----
> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson
> Sent: Tuesday, November 11, 2014 10:03 AM
> To: S. Davari; mpls@ietf.org
> Subject: Re: [mpls] commnets on draft-kini-mpls-spring-entropy-label
>=20
> Sharam,
>=20
> Is this something that you think is applicabel to draft-kini-mpls-
> spring-entropy-label only or to entropy labels in general?
>=20
> /Loa
>=20
>> On 2014-11-10 21:45, S. Davari wrote:
>> Hi Authors,
>>=20
>> As stated during this morning's IETF meeting, I wanted to suggest having
>> an option to not use ELI to indicate EL and just signal having EL with
>> the Tunnel Label. So existence of EL becomes a property of the Tunnel
>> Label. This would reduce number of labels in the stack.
>>=20
>> Thanks
>> Shahram
>>=20
>>=20
>> _______________________________________________
>> mpls mailing list
>> mpls@ietf.org
>> https://www.ietf.org/mailman/listinfo/mpls
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>=20
> _______________________________________________
> mpls mailing list
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> https://www.ietf.org/mailman/listinfo/mpls


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From: Xuxiaohu <xuxiaohu@huawei.com>
To: Shahram Davari <davari@broadcom.com>, Loa Andersson <loa@pi.nu>, "S. Davari" <davarish@yahoo.com>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] commnets on draft-kini-mpls-spring-entropy-label
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From: John E Drake <jdrake@juniper.net>
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We are dealing w/ mp2p and there is no way to identify the ingress.

Sent from my iPhone

> On Nov 11, 2014, at 9:47 AM, Shahram Davari <davari@broadcom.com> wrote:
>=20
> HI John,
>=20
> We could add the EL presence to the Label distribution signaling, similar=
 to PW FAT label. I think  adding an EL indicator  to the signaling is pref=
erred compared to increasing the Label stack depth.
>=20
> Thx
> Shahram
>=20
> -----Original Message-----
> From: John E Drake [mailto:jdrake@juniper.net]=20
> Sent: Tuesday, November 11, 2014 11:27 AM
> To: Shahram Davari
> Cc: Loa Andersson; S. Davari; mpls@ietf.org
> Subject: Re: [mpls] commnets on draft-kini-mpls-spring-entropy-label
>=20
> Shahram,
>=20
> Given that not all ingresses support EL and that there is no signaling be=
tween a given ingress and the egress regarding EL, how is the egress to kno=
w whether a given packet contains an EL?
>=20
> Sent from my iPhone
>=20
>> On Nov 11, 2014, at 9:15 AM, Shahram Davari <davari@broadcom.com> wrote:
>>=20
>> Hi Loa,
>>=20
>> It should be applicable to entropy label in general.=20
>>=20
>> Thanks
>> Shahram
>>=20
>> -----Original Message-----
>> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson
>> Sent: Tuesday, November 11, 2014 10:03 AM
>> To: S. Davari; mpls@ietf.org
>> Subject: Re: [mpls] commnets on draft-kini-mpls-spring-entropy-label
>>=20
>> Sharam,
>>=20
>> Is this something that you think is applicabel to draft-kini-mpls-
>> spring-entropy-label only or to entropy labels in general?
>>=20
>> /Loa
>>=20
>>> On 2014-11-10 21:45, S. Davari wrote:
>>> Hi Authors,
>>>=20
>>> As stated during this morning's IETF meeting, I wanted to suggest havin=
g
>>> an option to not use ELI to indicate EL and just signal having EL with
>>> the Tunnel Label. So existence of EL becomes a property of the Tunnel
>>> Label. This would reduce number of labels in the stack.
>>>=20
>>> Thanks
>>> Shahram
>>>=20
>>>=20
>>> _______________________________________________
>>> mpls mailing list
>>> mpls@ietf.org
>>> https://www.ietf.org/mailman/listinfo/mpls
>>=20
>> _______________________________________________
>> mpls mailing list
>> mpls@ietf.org
>> https://www.ietf.org/mailman/listinfo/mpls
>>=20
>> _______________________________________________
>> mpls mailing list
>> mpls@ietf.org
>> https://www.ietf.org/mailman/listinfo/mpls


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From: Shahram Davari <davari@broadcom.com>
To: John E Drake <jdrake@juniper.net>
Thread-Topic: [mpls] commnets on draft-kini-mpls-spring-entropy-label
Thread-Index: AQHP/SdOoy+qA/b080yu8bYAxX7RVZxcP2IA//+NuHCAAImXAP//fvkwgACH9ID//4AbUA==
Date: Tue, 11 Nov 2014 20:16:24 +0000
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References: <1415652334.98541.YahooMailNeo@web162505.mail.bf1.yahoo.com> <54624F6E.3040606@pi.nu>, <4A6CE49E6084B141B15C0713B8993F2831D7622E@SJEXCHMB12.corp.ad.broadcom.com> <1D62FDD7-7648-4761-B80B-1F65FF47120F@juniper.net>, <4A6CE49E6084B141B15C0713B8993F2831D764C3@SJEXCHMB12.corp.ad.broadcom.com> <8F9EB46B-74FB-4AA6-B9A4-3ACBC42D13EA@juniper.net>
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Cc: "mpls@ietf.org" <mpls@ietf.org>
Subject: Re: [mpls] commnets on draft-kini-mpls-spring-entropy-label
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I see. Seems that in MP2P case ELI is required.

Thx
SD

-----Original Message-----
From: John E Drake [mailto:jdrake@juniper.net]=20
Sent: Tuesday, November 11, 2014 11:52 AM
To: Shahram Davari
Cc: Loa Andersson; S. Davari; mpls@ietf.org
Subject: Re: [mpls] commnets on draft-kini-mpls-spring-entropy-label

We are dealing w/ mp2p and there is no way to identify the ingress.

Sent from my iPhone

> On Nov 11, 2014, at 9:47 AM, Shahram Davari <davari@broadcom.com> wrote:
>=20
> HI John,
>=20
> We could add the EL presence to the Label distribution signaling, similar=
 to PW FAT label. I think  adding an EL indicator  to the signaling is pref=
erred compared to increasing the Label stack depth.
>=20
> Thx
> Shahram
>=20
> -----Original Message-----
> From: John E Drake [mailto:jdrake@juniper.net]=20
> Sent: Tuesday, November 11, 2014 11:27 AM
> To: Shahram Davari
> Cc: Loa Andersson; S. Davari; mpls@ietf.org
> Subject: Re: [mpls] commnets on draft-kini-mpls-spring-entropy-label
>=20
> Shahram,
>=20
> Given that not all ingresses support EL and that there is no signaling be=
tween a given ingress and the egress regarding EL, how is the egress to kno=
w whether a given packet contains an EL?
>=20
> Sent from my iPhone
>=20
>> On Nov 11, 2014, at 9:15 AM, Shahram Davari <davari@broadcom.com> wrote:
>>=20
>> Hi Loa,
>>=20
>> It should be applicable to entropy label in general.=20
>>=20
>> Thanks
>> Shahram
>>=20
>> -----Original Message-----
>> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson
>> Sent: Tuesday, November 11, 2014 10:03 AM
>> To: S. Davari; mpls@ietf.org
>> Subject: Re: [mpls] commnets on draft-kini-mpls-spring-entropy-label
>>=20
>> Sharam,
>>=20
>> Is this something that you think is applicabel to draft-kini-mpls-
>> spring-entropy-label only or to entropy labels in general?
>>=20
>> /Loa
>>=20
>>> On 2014-11-10 21:45, S. Davari wrote:
>>> Hi Authors,
>>>=20
>>> As stated during this morning's IETF meeting, I wanted to suggest havin=
g
>>> an option to not use ELI to indicate EL and just signal having EL with
>>> the Tunnel Label. So existence of EL becomes a property of the Tunnel
>>> Label. This would reduce number of labels in the stack.
>>>=20
>>> Thanks
>>> Shahram
>>>=20
>>>=20
>>> _______________________________________________
>>> mpls mailing list
>>> mpls@ietf.org
>>> https://www.ietf.org/mailman/listinfo/mpls
>>=20
>> _______________________________________________
>> mpls mailing list
>> mpls@ietf.org
>> https://www.ietf.org/mailman/listinfo/mpls
>>=20
>> _______________________________________________
>> mpls mailing list
>> mpls@ietf.org
>> https://www.ietf.org/mailman/listinfo/mpls


From nobody Tue Nov 11 12:28:54 2014
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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Tue, 11 Nov 2014 10:28:14 -1000
Message-ID: <CAA=duU3M0HVt+D+zB_fDr=R0UXPV7hVzbpjCQQ2ZLYzMA=wTWA@mail.gmail.com>
To: Loa Andersson <loa@pi.nu>
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Cc: "mpls@ietf.org" <mpls@ietf.org>, "mpls-chairs@tools.ietf.org" <mpls-chairs@tools.ietf.org>, "draft-kini-mpls-spring-entropy-label@tools.ietf.org" <draft-kini-mpls-spring-entropy-label@tools.ietf.org>
Subject: Re: [mpls] poll to se if we have consensus to make draft-kini-mpls-spring-entropy-label an mpls wg document
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--001a11c1306899ca7705079b1f0d
Content-Type: text/plain; charset=UTF-8

Loa,

This is a well-supported draft with useful functionality, it should be a WG
draft.

Cheers,
Andy

On Tue, Nov 11, 2014 at 9:46 AM, Loa Andersson <loa@pi.nu> wrote:

> Working Group,
>
> This is to start a two week poll on adopting
> draft-kini-mpls-spring-entropy-label as an MPLS working group document.
>
> Please send your comments (support/not support) to the mpls working
> group mailing list (mpls@ietf.org). Please give a technical
> motivation for your support/not support, especially if you think that
> the document should not be adopted as a working group document.
>
> There is no IPR disclosures directly against this document.
>
> The authors has all stated on the working group mailing
> list that they are unaware of any IPR claims against this draft.
>
> However we have an outstanding issue on IPRs. There were more than
> one solution to entropy labels for spring, they are referenced in the
> document, but are labeled as "discounted". One of these proposed
> had an IPR disclosure.
>
> However if you are on the the mpls working group mailing list and
> aware of IPR that relates to this draft, the time to disclose
> this is now.
>
> This poll ends November 25, 2014.
>
> /Loa
> --
>
>
> Loa Andersson                        email: loa@mail01.huawei.com
> Senior MPLS Expert                          loa@pi.nu
> Huawei Technologies (consultant)     phone: +46 739 81 21 64
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

--001a11c1306899ca7705079b1f0d
Content-Type: text/html; charset=UTF-8
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<div dir=3D"ltr">Loa,<div><br></div><div>This is a well-supported draft wit=
h useful functionality, it should be a WG draft.</div><div><br></div><div>C=
heers,</div><div>Andy</div></div><div class=3D"gmail_extra"><br><div class=
=3D"gmail_quote">On Tue, Nov 11, 2014 at 9:46 AM, Loa Andersson <span dir=
=3D"ltr">&lt;<a href=3D"mailto:loa@pi.nu" target=3D"_blank">loa@pi.nu</a>&g=
t;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0=
 .8ex;border-left:1px #ccc solid;padding-left:1ex">Working Group,<br>
<br>
This is to start a two week poll on adopting<br>
draft-kini-mpls-spring-<u></u>entropy-label as an MPLS working group docume=
nt.<br>
<br>
Please send your comments (support/not support) to the mpls working<br>
group mailing list (<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls=
@ietf.org</a>). Please give a technical<br>
motivation for your support/not support, especially if you think that<br>
the document should not be adopted as a working group document.<br>
<br>
There is no IPR disclosures directly against this document.<br>
<br>
The authors has all stated on the working group mailing<br>
list that they are unaware of any IPR claims against this draft.<br>
<br>
However we have an outstanding issue on IPRs. There were more than<br>
one solution to entropy labels for spring, they are referenced in the<br>
document, but are labeled as &quot;discounted&quot;. One of these proposed<=
br>
had an IPR disclosure.<br>
<br>
However if you are on the the mpls working group mailing list and<br>
aware of IPR that relates to this draft, the time to disclose<br>
this is now.<br>
<br>
This poll ends November 25, 2014.<span class=3D"HOEnZb"><font color=3D"#888=
888"><br>
<br>
/Loa<br>
-- <br>
<br>
<br>
Loa Andersson=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 email: <a href=3D"mailto:loa@mail01.huawei.com" targe=
t=3D"_blank">loa@mail01.huawei.com</a><br>
Senior MPLS Expert=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"mailto:loa@pi.nu" target=3D"_=
blank">loa@pi.nu</a><br>
Huawei Technologies (consultant)=C2=A0 =C2=A0 =C2=A0phone: <a href=3D"tel:%=
2B46%20739%2081%2021%2064" value=3D"+46739812164" target=3D"_blank">+46 739=
 81 21 64</a><br>
<br>
______________________________<u></u>_________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" target=3D"_blank">ht=
tps://www.ietf.org/mailman/<u></u>listinfo/mpls</a><br>
</font></span></blockquote></div><br></div>

--001a11c1306899ca7705079b1f0d--


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Cc: Ross Callon <rcallon@juniper.net>, "mpls@ietf.org" <mpls@ietf.org>, "mpls-chairs@tools.ietf.org" <mpls-chairs@tools.ietf.org>, "draft-ietf-mpls-ldp-ipv6@tools.ietf.org" <draft-ietf-mpls-ldp-ipv6@tools.ietf.org>
Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc closed)
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I had raised similar concerns earlier. Hacking up =93per adjacency specific=
=94 Dual-stack TLV to mean for =93session-level=94 IPV6 FEC and Address cap=
abilities is completely wrong thing to do.


1.      Dual stack TLV is sent per Hello adjacency on an interface and its =
purpose is bootstrapping LDP session. There could be multiple interface/adj=
acencies with a peering session. The capability in question is a session le=
vel capability and not per hello adjacency on an interface. Hacking up an a=
djacency level TLV to negotiate  IPV6 session capabilities is a complete di=
sconnect.



2.      LDP session capability framework is defined in RFC 5561. There is a=
n already defined method in draft-ietf-mpls-ldp-ip-pw-capability (SAC Capab=
ilities) which is based on RFC 5561 to negotiate IPV6 FEC Capabilities in a=
n LDP session. Currently SAC Capabilities limit to explicit advertisement o=
f do_not_support =3D -ve case only. Just adding the following clause into S=
AC Capability include the +ve case (explicit support) is a generic way and =
time-tested solution.


=93Implementations complying to this draft must advertise the IPv6 prefix s=
tate advertisement control capability (draft-ietf-mpls-ldp-ip-pw-capability=
) in the initialization message  explicitly indicating support for LDP IPv6=
 FEC. Without the peer advertising this capability, an LSR must not send IP=
v6 addresses and IPv6 FECs to that peer.=94

            It does not make sense for an implementation to hack an adjacen=
cy level TLV (Dual Stack TLV which was introduced for a complete different =
purpose)  for the +ve case and then use IPV6 SAC Capabilities for =96ve cas=
e). There needs to be only one way to fulfill one specific purpose. I am su=
rprised too to see such kind of proposals in a Standards track item which i=
s likely to exist for many years.

Thanks,
Pranjal

From: Aissaoui, Mustapha (Mustapha)
Sent: Monday, November 10, 2014 3:00 PM
To: Rajiv Asati (rajiva); Dutta, Pranjal K (Pranjal)
Cc: Ross Callon; mpls@ietf.org; mpls-chairs@tools.ietf.org; draft-ietf-mpls=
-ldp-ipv6@tools.ietf.org
Subject: RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc cl=
osed)

Hi Rajiv,
We did not properly close this discussion and I noticed the draft was updat=
ed to use the dual-stack capability TLV in Hellos as a way to discover the =
LDP peer capability of handling IPv6 FECs and IPv6 addresses.

I am very surprised that we are deviating from the main LDP mechanism which=
 is the LDP capability as per RFC 5561. Furthermore, we only needed to disc=
over the IPv6 FEC and IPv6 address capabilities at the session level and no=
t at the Hello adjacency level. There is nothing which is specific to the a=
djacency here.

The dual-stack capability TLV has nothing to do with the FEC and address ca=
pability of an LSR, it is simply a way to handle preference for the control=
 plane establishment of the Hello adjacency. It is not a good precedent tha=
t this would be overloaded to indicate FEC and address capability advertise=
ment which is orthogonal to adjacency establishment.

I strongly believe that we simply needed to use the existing IPv6 capabilit=
y described in draft-ietf-mpls-ldp-ip-pw-capability,  which is extension of=
 LDP capabilities defined in RFC 5561. We could also define another capabil=
ity for the IPv6 addresses in that same draft if really required but I do n=
ot think we needed to. There needs to be only one method to do one thing an=
d draft-ietf-mpls-ldp-ip-pw-capability is the way to go  for any IPv6 FEC r=
elated =93session=94 capabilities.

To re-iterate, here is the proposal I made. Implementations complying to th=
is draft must advertise the IPv6 prefix state advertisement control capabil=
ity (draft-ietf-mpls-ldp-ip-pw-capability) in the initialization message ex=
plicitly indicating support for LDP IPv6 FEC. Without the peer advertising =
this capability, an LSR must not send IPv6 addresses and IPv6 FECs to that =
peer.

There was one individual support for this proposal on this mailing list and=
 I thus consider the discussion was not properly closed.

Regards,
Mustapha.

From: Dutta, Pranjal K (Pranjal)
Sent: Tuesday, September 02, 2014 5:33 PM
To: Aissaoui, Mustapha (Mustapha); Rajiv Asati (rajiva)
Cc: Ross Callon; mpls@ietf.org<mailto:mpls@ietf.org>; mpls-chairs@tools.iet=
f.org<mailto:mpls-chairs@tools.ietf.org>; draft-ietf-mpls-ldp-ipv6@tools.ie=
tf.org<mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org>
Subject: RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc cl=
osed)


I second to Mustapha. We should use features for what they are designed for=
. It is the SAC capability (draft-ietf-mpls-ldp-ip-pw-capability-07) that d=
efines the negotiation of IPV4/IPV6 Prefix FEC Capabilities in LDP session,=
 which fits into the required inter-op solution organically.



I do not consider explicit advertisement of IPv6 Prefix FEC SAC (D =3D 0) i=
n Initialization message can be seen as baggage. An implementation that doe=
s not want to receive IPv6 Prefix FECs will send D=3D1 in Initialization me=
ssage anyways.



Cheers,

Pranjal



-----Original Message-----
From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Aissaoui, Mustapha (=
Mustapha)
Sent: Tuesday, September 02, 2014 11:57 AM
To: Rajiv Asati (rajiva)
Cc: Ross Callon; mpls@ietf.org<mailto:mpls@ietf.org>; mpls-chairs@tools.iet=
f.org<mailto:mpls-chairs@tools.ietf.org>; draft-ietf-mpls-ldp-ipv6@tools.ie=
tf.org<mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org>
Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc cl=
osed)



Hi Rajiv,

I think the key point I am trying to convey is that we should keep the prot=
ocol clean and use features for what they are designed for. LDP has its own=
 capability advertisement and it is meant to address issues like this one.



Overloading the TR field of the initialization message means that a peer wi=
ll have to check both the TR and the SAC to decide what to do for the IPv6 =
prefix FEC while it is sufficient to check the SAC for all other FEC types.=
 This is inconsistent and will cause an unnecessary exception in the protoc=
ol.



Also, using the LDP advertisement capability is not a baggage in the future=
. This mechanism is used with mLDP P2P and MP2MP FECs and this is working f=
ine today although many implementations now support these types of FECs.



As for changing other drafts, we are simply talking about stating in draft-=
ietf-mpls-ldp-ip-pw-capability-07 that an LDP peer must set D-bit=3D0  in I=
Pv6 prefix FEC SAC in the initialization message.



Regards,

Mustapha.



> -----Original Message-----

> From: Rajiv Asati (rajiva) [mailto:rajiva@cisco.com]

> Sent: Saturday, August 30, 2014 7:19 AM

> To: Aissaoui, Mustapha (Mustapha)

> Cc: Ross Callon; mpls@ietf.org<mailto:mpls@ietf.org>; mpls-chairs@tools.i=
etf.org<mailto:mpls-chairs@tools.ietf.org>;

> draft-ietf-mpls-ldp- ipv6@tools.ietf.org<mailto:ipv6@tools.ietf.org>

> Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short

> wglc closed)

>

> Hi Mustapha,

>

> TR field is useful in case of dual-stack environment and using it for

> determining whether the peer implementation is compliant (wrt handling

> v6 address bindings and label bindings) is simple and straight forward.

>

> When v6-only peer implementations exist (and become a new norm), TR

> field usage would become moot. And we wouldn't have to see them. A

> very good thing, IMO.

>

> We need to think about how much of this baggage needs to carry over

> when single- stack ipv6 networks become a new norm (like single-stack ipv=
4 has been).

>

> Given that this draft already has built-in means to accommodate the

> RFC5036 non- compliant peer issue and do so in a simple manner, it is

> not necessary to require changing other drafts, IMO.

>

>

> Cheers,

> Raj

>

>

> PS; While there are multiple types of FECs, and it would be wise to

> dictate the default behavior (v6 FECs advertised) in v6-only

> environment with an option to change it. This is nothing different from c=
urrent protocol machinery.

>

>

> > On Aug 29, 2014, at 8:25 PM, "Aissaoui, Mustapha (Mustapha)"

> <mustapha.aissaoui@alcatel-lucent .com<mailto:mustapha.aissaoui@alcatel-l=
ucent%20.com>> wrote:

> >

> > Hi Rajiv,

> > See inline below for some follow-up.

> >

> > Regards,

> > Mustapha.

> >

> >> -----Original Message-----

> >> From: Rajiv Asati (rajiva) [mailto:rajiva@cisco.com]

> >> Sent: Wednesday, August 27, 2014 7:19 PM

> >> To: Ross Callon; Aissaoui, Mustapha (Mustapha); mpls@ietf.org<mailto:m=
pls@ietf.org>

> >> Cc: mpls-chairs@tools.ietf.org<mailto:mpls-chairs@tools.ietf.org>;

> >> draft-ietf-mpls-ldp-ipv6@tools.ietf.org<mailto:draft-ietf-mpls-ldp-ipv=
6@tools.ietf.org>

> >> Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short

> >> wglc closed)

> >>

> >>

> >> If this draft were to address the interoperability with rfc5036

> >> non-compliant implementations, then it would be easier to rather

> >> leverage the =8Ctransport preference=B9 TLV that is already part of th=
e version 13.

> >> This TLV was defined after the getting Adrian's and George=B9s feedbac=
k.

> >>

> >> http://tools.ietf.org/html/draft-ietf-mpls-ldp-ipv6-13#section-6.1.

> >> 1

> > MA> It is not a good idea to overload this new TLV with a capability

> > MA> advertisement

> role. LDP has its own capability advertisement mechanism and there is

> no need to confuse implementations with the handling of two mechanisms.

> >

> >> The reason for not agreeing to the alternate solution (of using IP

> >> Prefix capability

> >> etc.) is 2-fold:

> >>

> >> - not forward compatible (consider a deployment 5 yrs from now -

> >> IPv6-only MPLS network - now, the LSR will be expecting an

> >> unnecessary IPv6 prefix capability advertisement, and that=B9s not

> >> optimal, if not annoying)

> > MA> IPv6-only network is not synonymous with a single FEC type

> > MA> network. It will

> support many types of FECs  in addition to the IPv6 prefix FEC: mLDP

> IPv6 FECs, PW FECs, IPv4 prefix FEC, etc. The LDP capabilities have

> been designed for the purpose of explicitly enabling or disabling

> capabilities including FEC type support on a given session.

> >

> >> - not 100% backward compatible (does not solve the advertisement of

> >> v6 address binding to a v4 neighbor (which can also cause an outage

> >> to a non-compliant peer))

> > MA> I think it makes sense to tie the exchange of both IPv6 address

> > MA> messages

> and IPv6 prefix FECs to the advertisement of the IPv6 capability by

> both peers. If however there is a use case for decoupling the

> advertising of IPv6 addresses from

> IPv6 FECs, then a separate capability can be devised for addresses but

> I do not think we need it.

> >

> >

> >> Thanks.

> >>

> >>

> >> --

> >> Cheers,

> >> Rajiv Asati

> >> Distinguished Engineer, Cisco

> >>

> >>

> >>

> >>

> >>

> >> -----Original Message-----

> >> From: Ross Callon <rcallon@juniper.net<mailto:rcallon@juniper.net>>

> >> Date: Friday, August 22, 2014 at 4:34 PM

> >> To: Mustapha Aissaoui <mustapha.aissaoui@alcatel-lucent.com<mailto:mus=
tapha.aissaoui@alcatel-lucent.com>>,

> >> "mpls@ietf.org<mailto:mpls@ietf.org>" <mpls@ietf.org<mailto:mpls@ietf.=
org>>

> >> Cc: "mpls-chairs@tools.ietf.org<mailto:mpls-chairs@tools.ietf.org>" <m=
pls-chairs@tools.ietf.org<mailto:mpls-chairs@tools.ietf.org>>,

> >> "draft-ietf-mpls-ldp-ipv6@tools.ietf.org<mailto:draft-ietf-mpls-ldp-ip=
v6@tools.ietf.org>"

> >> <draft-ietf-mpls-ldp-ipv6@tools.ietf.org<mailto:draft-ietf-mpls-ldp-ip=
v6@tools.ietf.org>>

> >> Subject: RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short

> >> wglc

> >> closed)

> >> Resent-From: <draft-alias-bounces@tools.ietf.org<mailto:draft-alias-bo=
unces@tools.ietf.org>>

> >> Resent-To: Carlos Pignataro <cpignata@cisco.com<mailto:cpignata@cisco.=
com>>, Rajiv Papneja

> >> <rajiv.papneja@huawei.com<mailto:rajiv.papneja@huawei.com>>, Rajiv Asa=
ti <rajiva@cisco.com<mailto:rajiva@cisco.com>>, Vishwas

> >> Manral <vishwas.manral@hp.com<mailto:vishwas.manral@hp.com>>, <swallow=
@cisco.com<mailto:swallow@cisco.com>>, Loa Andersson

> >> <loa@pi.nu<mailto:loa@pi.nu>>, Ross Callon <rcallon@juniper.net<mailto=
:rcallon@juniper.net>>, MARTIN VIGOUREUX

> >> <martin.vigoureux@alcatel-lucent.com<mailto:martin.vigoureux@alcatel-l=
ucent.com>>

> >> Resent-Date: Friday, August 22, 2014 at 4:35 PM

> >>

> >>>> The proposed solution is to have implementations complying to

> >>>> this draft advertise the IPv6 prefix state advertisement control

> >>>> capability

> >>>> (draft-ietf-mpls-ldp-ip-pw-capability-07) in the initialization

> >>>> message explicitly indicating support for LDP IPv6. Without the

> >>>> peer advertising this capability, an LSR must not send IPv6

> >>>> addresses and FECs to that peer.

> >>>

> >>> Speaking as an individual contributor, this seems IMHO to be the

> >>> right solution (noting that, in final text as would be published

> >>> in an RFC, the "must not" in the last sentence should be capitalized)=
.

> >>>

> >>> Thanks, Ross

> >>>

> >>> -----Original Message-----

> >>> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Aissaoui,

> >>> Mustapha

> >>> (Mustapha)

> >>> Sent: Tuesday, August 19, 2014 3:19 AM

> >>> To: mpls@ietf.org<mailto:mpls@ietf.org>

> >>> Cc: mpls-chairs@tools.ietf.org<mailto:mpls-chairs@tools.ietf.org>;

> >>> draft-ietf-mpls-ldp-ipv6@tools.ietf.org<mailto:draft-ietf-mpls-ldp-ip=
v6@tools.ietf.org>

> >>> Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6

> >>> (short wglc

> >>> closed)

> >>>

> >>> Dear all,

> >>> The following are the details of the issue we found and the

> >>> proposed solution. We shared this first with the authors to get initi=
al feedback.

> >>>

> >>> When an LSR which supports LDP IPv6 according to this draft is in

> >>> a LAN with a broadcast interface, it can peer with LSRs which

> >>> support this draft and LSRs which do not. When it peers using IPv4

> >>> LDP control plane with an LSR which does not support this draft,

> >>> we have seen during our testing an issue that the advertisement of

> >>> IPv6 addresses or IPv6 FECs to that peer will cause it to bring

> >>> down the IPv4 LDP

> session.

> >>>

> >>> In other words, there are deployed LDP implementations which are

> >>> compliant to RFC 5036 for LDP IPv4 but are not compliant to RFC

> >>> 5036 when it comes to handling IPv6 address or IPv6 FECs over an

> >>> LDP IPv4

> session.

> >>> This is making us very concerned that when users enable dual-stack

> >>> LDP IPv4/IPv6, they will bring down LDP IPv4 sessions which have

> >>> been working in a multi-vendor environments for so many years.

> >>>

> >>> The proposed solution is to have implementations complying to this

> >>> draft advertise the IPv6 prefix state advertisement control

> >>> capability

> >>> (draft-ietf-mpls-ldp-ip-pw-capability-07) in the initialization

> >>> message explicitly indicating support for LDP IPv6. Without the

> >>> peer advertising this capability, an LSR must not send IPv6

> >>> addresses and FECs to that peer.

> >>>

> >>> This approach is safer and has been followed when mLDP FEC was

> >>> introduced as explained in Section 2.1 of RFC 6388. Also, this

> >>> does not introduce any new TLV to draft-ietf-mpls-ldp-ipv6. It

> >>> just makes the exchange of LDP IPv6 addresses and FECs conditional

> >>> to both peers explicitly indicating support for IPv6 capability

> >>> during LDP session

> initialization.

> >>>

> >>> We do not feel such a simple change justifies writing a new draft

> >>> and having to deal with backward compatibility of implementations

> >>> across two drafts.

> >>>

> >>> We appreciate your comments on this matter.

> >>>

> >>> Regards,

> >>> Mustapha.

> >>>

> >>>

> >>>> -----Original Message-----

> >>>> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa

> >>>> Andersson

> >>>> Sent: Tuesday, August 12, 2014 11:45 AM

> >>>> To: mpls@ietf.org<mailto:mpls@ietf.org>; mpls-chairs@tools.ietf.org<=
mailto:mpls-chairs@tools.ietf.org>;

> >>>> draft-ietf-mpls-ldp-ipv6@tools.ietf.org<mailto:draft-ietf-mpls-ldp-i=
pv6@tools.ietf.org>

> >>>> Subject: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short

> >>>> wglc

> >>>> closed)

> >>>>

> >>>> Working Group,

> >>>>

> >>>> During what we thought would be a short wglc on

> >>>> draft-ietf-mpls-ldp-ipv6

> >>>> http://www.ietf.org/mail-archive/web/mpls/current/msg12464.html

> >>>> we had a comment that stopped us from continuing progressing the dra=
ft.

> >>>>

> >>>> The short working group last call is now closed!

> >>>>

> >>>> The comment we refer to was raised in a private mail to the

> >>>> working group chairs and the draft authors.

> >>>>

> >>>> It says that there are a problem with some RFC 5036 non-compliant

> >>>> implementations deployed and draft-ietf-mpls-ldp-ipv6. There is

> >>>> no detailed description of the exact problems.

> >>>>

> >>>> We strongly encourage the people that made the comment(s) to

> >>>> write-up the problem, either as

> >>>>

> >>>> - a new draft (preferred); or

> >>>> - in a mail to the working group mailing list

> >>>>

> >>>> Once we an agreement to write a new draft or the write-up to the

> >>>> mailing, we will continue to ask the working group to see if we

> >>>> can agree to a way to progress. We like to see this write-up

> >>>> before September 1. Failing this we will continue to progress the

> >>>> draft-ietf-mpls-ldp-ipv6 as is.

> >>>>

> >>>> /Loa

> >>>> for the working group chairs

> >>>> --

> >>>>

> >>>>

> >>>> Loa Andersson                        email: loa@mail01.huawei.com<ma=
ilto:loa@mail01.huawei.com>

> >>>> Senior MPLS Expert                          loa@pi.nu<mailto:loa@pi.=
nu>

> >>>> Huawei Technologies (consultant)     phone: +46 739 81 21 64

> >>>>

> >>>> _______________________________________________

> >>>> mpls mailing list

> >>>> mpls@ietf.org<mailto:mpls@ietf.org>

> >>>> https://www.ietf.org/mailman/listinfo/mpls

> >>>

> >>> _______________________________________________

> >>> mpls mailing list

> >>> mpls@ietf.org<mailto:mpls@ietf.org>

> >>> https://www.ietf.org/mailman/listinfo/mpls

> >



_______________________________________________

mpls mailing list

mpls@ietf.org<mailto:mpls@ietf.org>

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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Times New Roman&quo=
t;,&quot;serif&quot;;color:#1F497D">I had raised similar concerns earlier. =
Hacking up =93per adjacency specific=94 Dual-stack TLV to mean for =93sessi=
on-level=94 IPV6 FEC and Address capabilities is completely wrong
 thing to do.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Times New Roman&quo=
t;,&quot;serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"font-family:&quot;Times New Rom=
an&quot;,&quot;serif&quot;;color:#1F497D"><span style=3D"mso-list:Ignore">1=
.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"font-family:&quot;Times New R=
oman&quot;,&quot;serif&quot;;color:#1F497D">Dual stack TLV is sent per Hell=
o adjacency on an interface and its purpose is bootstrapping LDP session. T=
here could be multiple interface/adjacencies with a peering
 session. The capability in question is a session level capability and not =
per hello adjacency on an interface. Hacking up an adjacency level TLV to n=
egotiate&nbsp; IPV6 session capabilities is a complete disconnect.<o:p></o:=
p></span></p>
<p class=3D"MsoListParagraph"><span style=3D"font-family:&quot;Times New Ro=
man&quot;,&quot;serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"font-family:&quot;Times New Rom=
an&quot;,&quot;serif&quot;;color:#1F497D"><span style=3D"mso-list:Ignore">2=
.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"font-family:&quot;Times New R=
oman&quot;,&quot;serif&quot;;color:#1F497D">LDP session capability framewor=
k is defined in RFC 5561. There is an already defined method in
</span><span style=3D"font-family:&quot;Times New Roman&quot;,&quot;serif&q=
uot;;color:#1F497D">draft-ietf-mpls-ldp-ip-pw-capability (SAC Capabilities)=
 which is based on RFC 5561 to negotiate IPV6 FEC Capabilities in an LDP se=
ssion. Currently SAC Capabilities limit to explicit advertisement
 of do_not_support =3D -ve case only. Just adding the following clause into=
 SAC Capability include the &#43;ve case (explicit support) is a generic wa=
y and time-tested solution.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span style=3D"font-family:&quot;Times New Ro=
man&quot;,&quot;serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-famil=
y:&quot;Arial&quot;,&quot;sans-serif&quot;">=93Implementations complying to=
 this draft must advertise the IPv6 prefix state advertisement control capa=
bility (draft-ietf-mpls-ldp-ip-pw-capability) in the initialization
 message &nbsp;explicitly indicating support for LDP IPv6 FEC. Without the =
peer advertising this capability, an LSR must not send IPv6 addresses and I=
Pv6 FECs to that peer.=94<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Times New Roman&quo=
t;,&quot;serif&quot;;color:#1F497D">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp; It does not make sense for an implementation to=
 hack an adjacency level TLV (Dual Stack TLV which was introduced for a com=
plete different purpose) &nbsp;for the &#43;ve
 case and then use IPV6 SAC Capabilities for =96ve case). There needs to be=
 only one way to fulfill one specific purpose. I am surprised too to see su=
ch kind of proposals in a Standards track item which is likely to exist for=
 many years.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Times New Roman&quo=
t;,&quot;serif&quot;;color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Times New Roman&quo=
t;,&quot;serif&quot;;color:#1F497D">Pranjal<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> Aissaoui=
, Mustapha (Mustapha)
<br>
<b>Sent:</b> Monday, November 10, 2014 3:00 PM<br>
<b>To:</b> Rajiv Asati (rajiva); Dutta, Pranjal K (Pranjal)<br>
<b>Cc:</b> Ross Callon; mpls@ietf.org; mpls-chairs@tools.ietf.org; draft-ie=
tf-mpls-ldp-ipv6@tools.ietf.org<br>
<b>Subject:</b> RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short =
wglc closed)<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">Hi Rajiv,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">We did not properly close this discussion and I noticed th=
e draft was updated to use the dual-stack capability TLV in Hellos as a way=
 to discover the LDP peer capability of handling IPv6 FECs
 and IPv6 addresses. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">I am very surprised that we are deviating from the main LD=
P mechanism which is the LDP capability as per RFC 5561. Furthermore, we on=
ly needed to discover the IPv6 FEC and IPv6 address capabilities
 at the session level and not at the Hello adjacency level. There is nothin=
g which is specific to the adjacency here.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">The dual-stack capability TLV has nothing to do with the F=
EC and address capability of an LSR, it is simply a way to handle preferenc=
e for the control plane establishment of the Hello adjacency.
 It is not a good precedent that this would be overloaded to indicate FEC a=
nd address capability advertisement which is orthogonal to adjacency establ=
ishment.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">I strongly believe that we simply needed to use the existi=
ng IPv6 capability described in draft-ietf-mpls-ldp-ip-pw-capability,&nbsp;=
 which is extension of LDP capabilities defined in RFC 5561.
 We could also define another capability for the IPv6 addresses in that sam=
e draft if really required but I do not think we needed to. There needs to =
be only one method to do one thing and draft-ietf-mpls-ldp-ip-pw-capability=
 is the way to go&nbsp; for any IPv6
 FEC related =93session=94 capabilities.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">To re-iterate, here is the proposal I made. Implementation=
s complying to this draft must advertise the IPv6 prefix state advertisemen=
t control capability (draft-ietf-mpls-ldp-ip-pw-capability)
 in the initialization message explicitly indicating support for LDP IPv6 F=
EC. Without the peer advertising this capability, an LSR must not send IPv6=
 addresses and IPv6 FECs to that peer.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">There was one individual support for this proposal on this=
 mailing list and I thus consider the discussion was not properly closed.<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">Mustapha.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> Dutta, P=
ranjal K (Pranjal)
<br>
<b>Sent:</b> Tuesday, September 02, 2014 5:33 PM<br>
<b>To:</b> Aissaoui, Mustapha (Mustapha); Rajiv Asati (rajiva)<br>
<b>Cc:</b> Ross Callon; <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>;=
 <a href=3D"mailto:mpls-chairs@tools.ietf.org">
mpls-chairs@tools.ietf.org</a>; <a href=3D"mailto:draft-ietf-mpls-ldp-ipv6@=
tools.ietf.org">
draft-ietf-mpls-ldp-ipv6@tools.ietf.org</a><br>
<b>Subject:</b> RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short =
wglc closed)<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:12.0pt;font-family:&quot=
;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D">I second to Mustaph=
a. We should use features for what they are designed for. It is the SAC cap=
ability (draft-ietf-mpls-ldp-ip-pw-capability-07) that defines
 the negotiation of IPV4/IPV6 Prefix FEC Capabilities in LDP session, which=
 fits into the required inter-op solution organically.<o:p></o:p></span></p=
>
<p class=3D"MsoPlainText"><span style=3D"font-size:12.0pt;font-family:&quot=
;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:12.0pt;font-family:&quot=
;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D">I do not consider e=
xplicit advertisement of IPv6 Prefix FEC SAC (D =3D 0) in Initialization me=
ssage can be seen as baggage. An implementation that does
 not want to receive IPv6 Prefix FECs will send D=3D1 in Initialization mes=
sage anyways.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:12.0pt;font-family:&quot=
;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D">Cheers,<o:p></o:p><=
/span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:12.0pt;font-family:&quot=
;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D">Pranjal<o:p></o:p><=
/span></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">-----Original Message-----<br>
From: mpls [<a href=3D"mailto:mpls-bounces@ietf.org">mailto:mpls-bounces@ie=
tf.org</a>] On Behalf Of Aissaoui, Mustapha (Mustapha)<br>
Sent: Tuesday, September 02, 2014 11:57 AM<br>
To: Rajiv Asati (rajiva)<br>
Cc: Ross Callon; <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>; <a hre=
f=3D"mailto:mpls-chairs@tools.ietf.org">
mpls-chairs@tools.ietf.org</a>; <a href=3D"mailto:draft-ietf-mpls-ldp-ipv6@=
tools.ietf.org">
draft-ietf-mpls-ldp-ipv6@tools.ietf.org</a><br>
Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc cl=
osed)<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Hi Rajiv,<o:p></o:p></p>
<p class=3D"MsoPlainText">I think the key point I am trying to convey is th=
at we should keep the protocol clean and use features for what they are des=
igned for. LDP has its own capability advertisement and it is meant to addr=
ess issues like this one.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Overloading the TR field of the initialization me=
ssage means that a peer will have to check both the TR and the SAC to decid=
e what to do for the IPv6 prefix FEC while it is sufficient to check the SA=
C for all other FEC types. This is
 inconsistent and will cause an unnecessary exception in the protocol.<o:p>=
</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Also, using the LDP advertisement capability is n=
ot a baggage in the future. This mechanism is used with mLDP P2P and MP2MP =
FECs and this is working fine today although many implementations now suppo=
rt these types of FECs.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">As for changing other drafts, we are simply talki=
ng about stating in draft-ietf-mpls-ldp-ip-pw-capability-07 that an LDP pee=
r must set D-bit=3D0&nbsp; in IPv6 prefix FEC SAC in the initialization mes=
sage.
<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Regards,<o:p></o:p></p>
<p class=3D"MsoPlainText">Mustapha.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&gt; -----Original Message-----<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; From: Rajiv Asati (rajiva) [<a href=3D"mailt=
o:rajiva@cisco.com"><span style=3D"color:windowtext;text-decoration:none">m=
ailto:rajiva@cisco.com</span></a>]<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Sent: Saturday, August 30, 2014 7:19 AM<o:p>=
</o:p></p>
<p class=3D"MsoPlainText">&gt; To: Aissaoui, Mustapha (Mustapha)<o:p></o:p>=
</p>
<p class=3D"MsoPlainText">&gt; Cc: Ross Callon; <a href=3D"mailto:mpls@ietf=
.org"><span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</=
span></a>;
<a href=3D"mailto:mpls-chairs@tools.ietf.org"><span style=3D"color:windowte=
xt;text-decoration:none">mpls-chairs@tools.ietf.org</span></a>;
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; draft-ietf-mpls-ldp- <a href=3D"mailto:ipv6@=
tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">ipv6@tools.ietf.org</=
span></a><o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Subject: Re: [mpls] Way to progress draft-ie=
tf-mpls-ldp-ipv6 (short
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; wglc closed)<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Hi Mustapha,<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; TR field is useful in case of dual-stack env=
ironment and using it for
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; determining whether the peer implementation =
is compliant (wrt handling
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; v6 address bindings and label bindings) is s=
imple and straight forward.<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; When v6-only peer implementations exist (and=
 become a new norm), TR
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; field usage would become moot. And we wouldn=
't have to see them. A
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; very good thing, IMO.<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; We need to think about how much of this bagg=
age needs to carry over
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; when single- stack ipv6 networks become a ne=
w norm (like single-stack ipv4 has been).<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Given that this draft already has built-in m=
eans to accommodate the
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; RFC5036 non- compliant peer issue and do so =
in a simple manner, it is
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; not necessary to require changing other draf=
ts, IMO.<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Cheers,<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Raj<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; PS; While there are multiple types of FECs, =
and it would be wise to
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; dictate the default behavior (v6 FECs advert=
ised) in v6-only
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; environment with an option to change it. Thi=
s is nothing different from current protocol machinery.<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt; On Aug 29, 2014, at 8:25 PM, &quot;Aiss=
aoui, Mustapha (Mustapha)&quot;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &lt;<a href=3D"mailto:mustapha.aissaoui@alca=
tel-lucent%20.com"><span style=3D"color:windowtext;text-decoration:none">mu=
stapha.aissaoui@alcatel-lucent .com</span></a>&gt; wrote:<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt; Hi Rajiv,<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt; See inline below for some follow-up.<o:=
p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt; Regards,<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt; Mustapha.<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; -----Original Message-----<o:p></o:=
p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; From: Rajiv Asati (rajiva) [<a href=
=3D"mailto:rajiva@cisco.com"><span style=3D"color:windowtext;text-decoratio=
n:none">mailto:rajiva@cisco.com</span></a>]<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; Sent: Wednesday, August 27, 2014 7:=
19 PM<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; To: Ross Callon; Aissaoui, Mustapha=
 (Mustapha); <a href=3D"mailto:mpls@ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</span><=
/a><o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; Cc: <a href=3D"mailto:mpls-chairs@t=
ools.ietf.org"><span style=3D"color:windowtext;text-decoration:none">mpls-c=
hairs@tools.ietf.org</span></a>;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; <a href=3D"mailto:draft-ietf-mpls-l=
dp-ipv6@tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">draft-ietf-mpls-ldp-i=
pv6@tools.ietf.org</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; Subject: Re: [mpls] Way to progress=
 draft-ietf-mpls-ldp-ipv6 (short
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; wglc closed)<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; If this draft were to address the i=
nteroperability with rfc5036
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; non-co=
mpliant implementations, then it would be easier to rather
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; levera=
ge the =8Ctransport preference=B9 TLV that is already part of the version 1=
3.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; This T=
LV was defined after the getting Adrian's and George=B9s feedback.<o:p></o:=
p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; <a hre=
f=3D"http://tools.ietf.org/html/draft-ietf-mpls-ldp-ipv6-13#section-6.1">
<span style=3D"color:windowtext;text-decoration:none">http://tools.ietf.org=
/html/draft-ietf-mpls-ldp-ipv6-13#section-6.1</span></a>.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; 1<o:p>=
</o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; It =
is not a good idea to overload this new TLV with a capability
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; adv=
ertisement<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; role. LDP has i=
ts own capability advertisement mechanism and there is
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; no need to conf=
use implementations with the handling of two mechanisms.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;<o:p></o:p>=
</p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; The re=
ason for not agreeing to the alternate solution (of using IP
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Prefix=
 capability<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; etc.) =
is 2-fold:<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; - not =
forward compatible (consider a deployment 5 yrs from now -
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; IPv6-o=
nly MPLS network - now, the LSR will be expecting an
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; unnece=
ssary IPv6 prefix capability advertisement, and that=B9s not
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; optima=
l, if not annoying)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; IPv=
6-only network is not synonymous with a single FEC type
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; net=
work. It will<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; support many ty=
pes of FECs&nbsp; in addition to the IPv6 prefix FEC: mLDP
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt"><span lang=3D"FR-CA"=
>&gt; IPv6 FECs, PW FECs, IPv4 prefix FEC, etc.
</span>The LDP capabilities have <o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; been designed f=
or the purpose of explicitly enabling or disabling
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; capabilities in=
cluding FEC type support on a given session.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;<o:p></o:p>=
</p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; - not =
100% backward compatible (does not solve the advertisement of<o:p></o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; v6 add=
ress binding to a v4 neighbor (which can also cause an outage
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; to a n=
on-compliant peer))<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; I t=
hink it makes sense to tie the exchange of both IPv6 address
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; mes=
sages<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; and IPv6 prefix=
 FECs to the advertisement of the IPv6 capability by
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; both peers. If =
however there is a use case for decoupling the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; advertising of =
IPv6 addresses from<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; IPv6 FECs, then=
 a separate capability can be devised for addresses but
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; I do not think =
we need it.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;<o:p></o:p>=
</p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;<o:p></o:p>=
</p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Thanks=
.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; --<o:p=
></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Cheers=
,<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Rajiv =
Asati<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Distin=
guished Engineer, Cisco<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; -----O=
riginal Message-----<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; From: =
Ross Callon &lt;<a href=3D"mailto:rcallon@juniper.net"><span style=3D"color=
:windowtext;text-decoration:none">rcallon@juniper.net</span></a>&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Date: =
Friday, August 22, 2014 at 4:34 PM<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; To: Mu=
stapha Aissaoui &lt;<a href=3D"mailto:mustapha.aissaoui@alcatel-lucent.com"=
><span style=3D"color:windowtext;text-decoration:none">mustapha.aissaoui@al=
catel-lucent.com</span></a>&gt;,<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; &quot;=
<a href=3D"mailto:mpls@ietf.org"><span style=3D"color:windowtext;text-decor=
ation:none">mpls@ietf.org</span></a>&quot; &lt;<a href=3D"mailto:mpls@ietf.=
org"><span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</s=
pan></a>&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Cc: &q=
uot;<a href=3D"mailto:mpls-chairs@tools.ietf.org"><span style=3D"color:wind=
owtext;text-decoration:none">mpls-chairs@tools.ietf.org</span></a>&quot; &l=
t;<a href=3D"mailto:mpls-chairs@tools.ietf.org"><span style=3D"color:window=
text;text-decoration:none">mpls-chairs@tools.ietf.org</span></a>&gt;,
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; &quot;=
<a href=3D"mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org"><span style=3D"c=
olor:windowtext;text-decoration:none">draft-ietf-mpls-ldp-ipv6@tools.ietf.o=
rg</span></a>&quot;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; &lt;<a=
 href=3D"mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org"><span style=3D"col=
or:windowtext;text-decoration:none">draft-ietf-mpls-ldp-ipv6@tools.ietf.org=
</span></a>&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Subjec=
t: RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; wglc<o=
:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; closed=
)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Resent=
-From: &lt;<a href=3D"mailto:draft-alias-bounces@tools.ietf.org"><span styl=
e=3D"color:windowtext;text-decoration:none">draft-alias-bounces@tools.ietf.=
org</span></a>&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Resent=
-To: Carlos Pignataro &lt;<a href=3D"mailto:cpignata@cisco.com"><span style=
=3D"color:windowtext;text-decoration:none">cpignata@cisco.com</span></a>&gt=
;, Rajiv Papneja
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; &lt;<a=
 href=3D"mailto:rajiv.papneja@huawei.com"><span style=3D"color:windowtext;t=
ext-decoration:none">rajiv.papneja@huawei.com</span></a>&gt;, Rajiv Asati &=
lt;<a href=3D"mailto:rajiva@cisco.com"><span style=3D"color:windowtext;text=
-decoration:none">rajiva@cisco.com</span></a>&gt;,
 Vishwas <o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Manral=
 &lt;<a href=3D"mailto:vishwas.manral@hp.com"><span style=3D"color:windowte=
xt;text-decoration:none">vishwas.manral@hp.com</span></a>&gt;, &lt;<a href=
=3D"mailto:swallow@cisco.com"><span style=3D"color:windowtext;text-decorati=
on:none">swallow@cisco.com</span></a>&gt;,
 Loa Andersson <o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt"><span lang=3D"FR-CA"=
>&gt; &gt;&gt; &lt;</span><a href=3D"mailto:loa@pi.nu"><span lang=3D"FR-CA"=
 style=3D"color:windowtext;text-decoration:none">loa@pi.nu</span></a><span =
lang=3D"FR-CA">&gt;, Ross Callon &lt;</span><a href=3D"mailto:rcallon@junip=
er.net"><span lang=3D"FR-CA" style=3D"color:windowtext;text-decoration:none=
">rcallon@juniper.net</span></a><span lang=3D"FR-CA">&gt;,
 MARTIN VIGOUREUX <o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt"><span lang=3D"FR-CA"=
>&gt; &gt;&gt; &lt;</span><a href=3D"mailto:martin.vigoureux@alcatel-lucent=
.com"><span lang=3D"FR-CA" style=3D"color:windowtext;text-decoration:none">=
martin.vigoureux@alcatel-lucent.com</span></a><span lang=3D"FR-CA">&gt;<o:p=
></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Resent=
-Date: Friday, August 22, 2014 at 4:35 PM<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; The proposed solution is to have implementations complying to
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; this draft advertise the IPv6 prefix state advertisement control
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; capability<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; (draft-ietf-mpls-ldp-ip-pw-capability-07) in the initialization
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; message explicitly indicating support for LDP IPv6. Without the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; peer advertising this capability, an LSR must not send IPv6
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; addresses and FECs to that peer.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Sp=
eaking as an individual contributor, this seems IMHO to be the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; ri=
ght solution (noting that, in final text as would be published
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; in=
 an RFC, the &quot;must not&quot; in the last sentence should be capitalize=
d).<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Th=
anks, Ross<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; --=
---Original Message-----<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Fr=
om: mpls [<a href=3D"mailto:mpls-bounces@ietf.org"><span style=3D"color:win=
dowtext;text-decoration:none">mailto:mpls-bounces@ietf.org</span></a>] On B=
ehalf Of Aissaoui,
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Mu=
stapha<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; (M=
ustapha)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Se=
nt: Tuesday, August 19, 2014 3:19 AM<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; To=
: <a href=3D"mailto:mpls@ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</span><=
/a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Cc=
: <a href=3D"mailto:mpls-chairs@tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls-chairs@tools.iet=
f.org</span></a>;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; <a=
 href=3D"mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">draft-ietf-mpls-ldp-i=
pv6@tools.ietf.org</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Su=
bject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; (s=
hort wglc<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; cl=
osed)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; De=
ar all,<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Th=
e following are the details of the issue we found and the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; pr=
oposed solution. We shared this first with the authors to get initial feedb=
ack.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Wh=
en an LSR which supports LDP IPv6 according to this draft is in
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; a =
LAN with a broadcast interface, it can peer with LSRs which
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; su=
pport this draft and LSRs which do not. When it peers using IPv4
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; LD=
P control plane with an LSR which does not support this draft,
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; we=
 have seen during our testing an issue that the advertisement of
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; IP=
v6 addresses or IPv6 FECs to that peer will cause it to bring
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; do=
wn the IPv4 LDP<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; session.<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; In=
 other words, there are deployed LDP implementations which are
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; co=
mpliant to RFC 5036 for LDP IPv4 but are not compliant to RFC
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; 50=
36 when it comes to handling IPv6 address or IPv6 FECs over an
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; LD=
P IPv4<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; session.<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Th=
is is making us very concerned that when users enable dual-stack
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; LD=
P IPv4/IPv6, they will bring down LDP IPv4 sessions which have
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; be=
en working in a multi-vendor environments for so many years.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Th=
e proposed solution is to have implementations complying to this
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; dr=
aft advertise the IPv6 prefix state advertisement control
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; ca=
pability<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; (d=
raft-ietf-mpls-ldp-ip-pw-capability-07) in the initialization
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; me=
ssage explicitly indicating support for LDP IPv6. Without the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; pe=
er advertising this capability, an LSR must not send IPv6
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; ad=
dresses and FECs to that peer.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Th=
is approach is safer and has been followed when mLDP FEC was
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; in=
troduced as explained in Section 2.1 of RFC 6388. Also, this
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; do=
es not introduce any new TLV to draft-ietf-mpls-ldp-ipv6. It
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; ju=
st makes the exchange of LDP IPv6 addresses and FECs conditional
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; to=
 both peers explicitly indicating support for IPv6 capability
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; du=
ring LDP session<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; initialization.=
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; We=
 do not feel such a simple change justifies writing a new draft
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; an=
d having to deal with backward compatibility of implementations
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; ac=
ross two drafts.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; We=
 appreciate your comments on this matter.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Re=
gards,<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Mu=
stapha.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; -----Original Message-----<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; From: mpls [<a href=3D"mailto:mpls-bounces@ietf.org"><span style=3D"color=
:windowtext;text-decoration:none">mailto:mpls-bounces@ietf.org</span></a>] =
On Behalf Of Loa
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Andersson<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Sent: Tuesday, August 12, 2014 11:45 AM<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; To: <a href=3D"mailto:mpls@ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</span><=
/a>; <a href=3D"mailto:mpls-chairs@tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls-chairs@tools.iet=
f.org</span></a>;
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; <a href=3D"mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">draft-ietf-mpls-ldp-i=
pv6@tools.ietf.org</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Subject: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; wglc<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; closed)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Working Group,<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; During what we thought would be a short wglc on<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; draft-ietf-mpls-ldp-ipv6<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; <a href=3D"http://www.ietf.org/mail-archive/web/mpls/current/msg12464.htm=
l">
<span style=3D"color:windowtext;text-decoration:none">http://www.ietf.org/m=
ail-archive/web/mpls/current/msg12464.html</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; we had a comment that stopped us from continuing progressing the draft.<o=
:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; The short working group last call is now closed!<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; The comment we refer to was raised in a private mail to the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; working group chairs and the draft authors.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; It says that there are a problem with some RFC 5036 non-compliant
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; implementations deployed and draft-ietf-mpls-ldp-ipv6. There is
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; no detailed description of the exact problems.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; We strongly encourage the people that made the comment(s) to
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; write-up the problem, either as<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; - a new draft (preferred); or<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; - in a mail to the working group mailing list<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Once we an agreement to write a new draft or the write-up to the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; mailing, we will continue to ask the working group to see if we
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; can agree to a way to progress. We like to see this write-up
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; before September 1. Failing this we will continue to progress the<o:p></o=
:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; draft-ietf-mpls-ldp-ipv6 as is.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; /Loa<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; for the working group chairs<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; --<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Loa Andersson&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; email:
<a href=3D"mailto:loa@mail01.huawei.com"><span style=3D"color:windowtext;te=
xt-decoration:none">loa@mail01.huawei.com</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Senior MPLS Expert&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
<a href=3D"mailto:loa@pi.nu"><span style=3D"color:windowtext;text-decoratio=
n:none">loa@pi.nu</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Huawei Technologies (consultant)&nbsp;&nbsp;&nbsp;&nbsp; phone: &#43;46 7=
39 81 21 64<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; _______________________________________________<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; mpls mailing list<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; <a href=3D"mailto:mpls@ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</span><=
/a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; <a href=3D"https://www.ietf.org/mailman/listinfo/mpls">
<span style=3D"color:windowtext;text-decoration:none">https://www.ietf.org/=
mailman/listinfo/mpls</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; __=
_____________________________________________<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; mp=
ls mailing list<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; <a=
 href=3D"mailto:mpls@ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</span><=
/a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; <a=
 href=3D"https://www.ietf.org/mailman/listinfo/mpls">
<span style=3D"color:windowtext;text-decoration:none">https://www.ietf.org/=
mailman/listinfo/mpls</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;<o:p></o:p>=
</p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">____________________=
___________________________<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">mpls mailing list<o:=
p></o:p></p>
<p class=3D"MsoPlainText"><a href=3D"mailto:mpls@ietf.org"><span style=3D"c=
olor:windowtext;text-decoration:none">mpls@ietf.org</span></a><o:p></o:p></=
p>
<p class=3D"MsoPlainText"><a href=3D"https://www.ietf.org/mailman/listinfo/=
mpls"><span style=3D"color:windowtext;text-decoration:none">https://www.iet=
f.org/mailman/listinfo/mpls</span></a><o:p></o:p></p>
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Date: Tue, 11 Nov 2014 21:31:11 +0100
From: Loa Andersson <loa@pi.nu>
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Subject: [mpls] :( - Greg and Nobo tells me it is broken -Re: poll to se if we have consensus to make draft-kini-mpls-spring-entropy-label an mpls wg document
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Need to check up on this fairly quickly!

/Loa

On 2014-11-11 21:28, Andrew G. Malis wrote:
> Loa,
>
> This is a well-supported draft with useful functionality, it should be a
> WG draft.
>
> Cheers,
> Andy
>
> On Tue, Nov 11, 2014 at 9:46 AM, Loa Andersson <loa@pi.nu
> <mailto:loa@pi.nu>> wrote:
>
>     Working Group,
>
>     This is to start a two week poll on adopting
>     draft-kini-mpls-spring-__entropy-label as an MPLS working group
>     document.
>
>     Please send your comments (support/not support) to the mpls working
>     group mailing list (mpls@ietf.org <mailto:mpls@ietf.org>). Please
>     give a technical
>     motivation for your support/not support, especially if you think that
>     the document should not be adopted as a working group document.
>
>     There is no IPR disclosures directly against this document.
>
>     The authors has all stated on the working group mailing
>     list that they are unaware of any IPR claims against this draft.
>
>     However we have an outstanding issue on IPRs. There were more than
>     one solution to entropy labels for spring, they are referenced in the
>     document, but are labeled as "discounted". One of these proposed
>     had an IPR disclosure.
>
>     However if you are on the the mpls working group mailing list and
>     aware of IPR that relates to this draft, the time to disclose
>     this is now.
>
>     This poll ends November 25, 2014.
>
>     /Loa
>     --
>
>
>     Loa Andersson                        email: loa@mail01.huawei.com
>     <mailto:loa@mail01.huawei.com>
>     Senior MPLS Expert loa@pi.nu <mailto:loa@pi.nu>
>     Huawei Technologies (consultant)     phone: +46 739 81 21 64
>     <tel:%2B46%20739%2081%2021%2064>
>
>     _________________________________________________
>     mpls mailing list
>     mpls@ietf.org <mailto:mpls@ietf.org>
>     https://www.ietf.org/mailman/__listinfo/mpls
>     <https://www.ietf.org/mailman/listinfo/mpls>
>
>

-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


From nobody Tue Nov 11 12:34:09 2014
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Subject: Re: [mpls] :( - Greg and Nobo tells me it is broken -Re: poll to se if we have consensus to make draft-kini-mpls-spring-entropy-label an mpls wg document
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Folks,

Sorry this was intended for Andy only, but it is correct that I will
have to check up on this is input before closing the wg adoption poll.

/Loa


On 2014-11-11 21:31, Loa Andersson wrote:
> Need to check up on this fairly quickly!
>
> /Loa
>
> On 2014-11-11 21:28, Andrew G. Malis wrote:
>> Loa,
>>
>> This is a well-supported draft with useful functionality, it should be a
>> WG draft.
>>
>> Cheers,
>> Andy
>>
>> On Tue, Nov 11, 2014 at 9:46 AM, Loa Andersson <loa@pi.nu
>> <mailto:loa@pi.nu>> wrote:
>>
>>     Working Group,
>>
>>     This is to start a two week poll on adopting
>>     draft-kini-mpls-spring-__entropy-label as an MPLS working group
>>     document.
>>
>>     Please send your comments (support/not support) to the mpls working
>>     group mailing list (mpls@ietf.org <mailto:mpls@ietf.org>). Please
>>     give a technical
>>     motivation for your support/not support, especially if you think that
>>     the document should not be adopted as a working group document.
>>
>>     There is no IPR disclosures directly against this document.
>>
>>     The authors has all stated on the working group mailing
>>     list that they are unaware of any IPR claims against this draft.
>>
>>     However we have an outstanding issue on IPRs. There were more than
>>     one solution to entropy labels for spring, they are referenced in the
>>     document, but are labeled as "discounted". One of these proposed
>>     had an IPR disclosure.
>>
>>     However if you are on the the mpls working group mailing list and
>>     aware of IPR that relates to this draft, the time to disclose
>>     this is now.
>>
>>     This poll ends November 25, 2014.
>>
>>     /Loa
>>     --
>>
>>
>>     Loa Andersson                        email: loa@mail01.huawei.com
>>     <mailto:loa@mail01.huawei.com>
>>     Senior MPLS Expert loa@pi.nu <mailto:loa@pi.nu>
>>     Huawei Technologies (consultant)     phone: +46 739 81 21 64
>>     <tel:%2B46%20739%2081%2021%2064>
>>
>>     _________________________________________________
>>     mpls mailing list
>>     mpls@ietf.org <mailto:mpls@ietf.org>
>>     https://www.ietf.org/mailman/__listinfo/mpls
>>     <https://www.ietf.org/mailman/listinfo/mpls>
>>
>>
>

-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


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Date: Tue, 11 Nov 2014 10:46:33 -1000
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Subject: Re: [mpls] :( - Greg and Nobo tells me it is broken -Re: poll to se if we have consensus to make draft-kini-mpls-spring-entropy-label an mpls wg document
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--001a11c2ca3018f38105079b61b7
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Loa,

Nobo had an email about five days ago that discussed a bug and proposed a
fix, but there's not reason that it can't be fixed while still becoming a
WG document.

Cheers,
Andy


On Tue, Nov 11, 2014 at 10:31 AM, Loa Andersson <loa@pi.nu> wrote:

> Need to check up on this fairly quickly!
>
> /Loa
>
> On 2014-11-11 21:28, Andrew G. Malis wrote:
>
>> Loa,
>>
>> This is a well-supported draft with useful functionality, it should be a
>> WG draft.
>>
>> Cheers,
>> Andy
>>
>> On Tue, Nov 11, 2014 at 9:46 AM, Loa Andersson <loa@pi.nu
>> <mailto:loa@pi.nu>> wrote:
>>
>>     Working Group,
>>
>>     This is to start a two week poll on adopting
>>     draft-kini-mpls-spring-__entropy-label as an MPLS working group
>>     document.
>>
>>     Please send your comments (support/not support) to the mpls working
>>     group mailing list (mpls@ietf.org <mailto:mpls@ietf.org>). Please
>>     give a technical
>>     motivation for your support/not support, especially if you think that
>>     the document should not be adopted as a working group document.
>>
>>     There is no IPR disclosures directly against this document.
>>
>>     The authors has all stated on the working group mailing
>>     list that they are unaware of any IPR claims against this draft.
>>
>>     However we have an outstanding issue on IPRs. There were more than
>>     one solution to entropy labels for spring, they are referenced in the
>>     document, but are labeled as "discounted". One of these proposed
>>     had an IPR disclosure.
>>
>>     However if you are on the the mpls working group mailing list and
>>     aware of IPR that relates to this draft, the time to disclose
>>     this is now.
>>
>>     This poll ends November 25, 2014.
>>
>>     /Loa
>>     --
>>
>>
>>     Loa Andersson                        email: loa@mail01.huawei.com
>>     <mailto:loa@mail01.huawei.com>
>>     Senior MPLS Expert loa@pi.nu <mailto:loa@pi.nu>
>>     Huawei Technologies (consultant)     phone: +46 739 81 21 64
>>     <tel:%2B46%20739%2081%2021%2064>
>>
>>     _________________________________________________
>>     mpls mailing list
>>     mpls@ietf.org <mailto:mpls@ietf.org>
>>     https://www.ietf.org/mailman/__listinfo/mpls
>>     <https://www.ietf.org/mailman/listinfo/mpls>
>>
>>
>>
> --
>
>
> Loa Andersson                        email: loa@mail01.huawei.com
> Senior MPLS Expert                          loa@pi.nu
> Huawei Technologies (consultant)     phone: +46 739 81 21 64
>

--001a11c2ca3018f38105079b61b7
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<div dir=3D"ltr">Loa,<div><br></div><div>Nobo had an email about five days =
ago that discussed a bug and proposed a fix, but there&#39;s not reason tha=
t it can&#39;t be fixed while still becoming a WG document.</div><div><br><=
/div><div>Cheers,</div><div>Andy</div><div><br></div></div><div class=3D"gm=
ail_extra"><br><div class=3D"gmail_quote">On Tue, Nov 11, 2014 at 10:31 AM,=
 Loa Andersson <span dir=3D"ltr">&lt;<a href=3D"mailto:loa@pi.nu" target=3D=
"_blank">loa@pi.nu</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quot=
e" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">=
Need to check up on this fairly quickly!<br>
<br>
/Loa<br>
<br>
On 2014-11-11 21:28, Andrew G. Malis wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
Loa,<br>
<br>
This is a well-supported draft with useful functionality, it should be a<br=
>
WG draft.<br>
<br>
Cheers,<br>
Andy<br>
<br>
On Tue, Nov 11, 2014 at 9:46 AM, Loa Andersson &lt;<a href=3D"mailto:loa@pi=
.nu" target=3D"_blank">loa@pi.nu</a><br>
&lt;mailto:<a href=3D"mailto:loa@pi.nu" target=3D"_blank">loa@pi.nu</a>&gt;=
&gt; wrote:<br>
<br>
=C2=A0 =C2=A0 Working Group,<br>
<br>
=C2=A0 =C2=A0 This is to start a two week poll on adopting<br>
=C2=A0 =C2=A0 draft-kini-mpls-spring-__<u></u>entropy-label as an MPLS work=
ing group<br>
=C2=A0 =C2=A0 document.<br>
<br>
=C2=A0 =C2=A0 Please send your comments (support/not support) to the mpls w=
orking<br>
=C2=A0 =C2=A0 group mailing list (<a href=3D"mailto:mpls@ietf.org" target=
=3D"_blank">mpls@ietf.org</a> &lt;mailto:<a href=3D"mailto:mpls@ietf.org" t=
arget=3D"_blank">mpls@ietf.org</a>&gt;). Please<br>
=C2=A0 =C2=A0 give a technical<br>
=C2=A0 =C2=A0 motivation for your support/not support, especially if you th=
ink that<br>
=C2=A0 =C2=A0 the document should not be adopted as a working group documen=
t.<br>
<br>
=C2=A0 =C2=A0 There is no IPR disclosures directly against this document.<b=
r>
<br>
=C2=A0 =C2=A0 The authors has all stated on the working group mailing<br>
=C2=A0 =C2=A0 list that they are unaware of any IPR claims against this dra=
ft.<br>
<br>
=C2=A0 =C2=A0 However we have an outstanding issue on IPRs. There were more=
 than<br>
=C2=A0 =C2=A0 one solution to entropy labels for spring, they are reference=
d in the<br>
=C2=A0 =C2=A0 document, but are labeled as &quot;discounted&quot;. One of t=
hese proposed<br>
=C2=A0 =C2=A0 had an IPR disclosure.<br>
<br>
=C2=A0 =C2=A0 However if you are on the the mpls working group mailing list=
 and<br>
=C2=A0 =C2=A0 aware of IPR that relates to this draft, the time to disclose=
<br>
=C2=A0 =C2=A0 this is now.<br>
<br>
=C2=A0 =C2=A0 This poll ends November 25, 2014.<br>
<br>
=C2=A0 =C2=A0 /Loa<br>
=C2=A0 =C2=A0 --<br>
<br>
<br>
=C2=A0 =C2=A0 Loa Andersson=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 email: <a href=3D"mailto:loa@mail01.hua=
wei.com" target=3D"_blank">loa@mail01.huawei.com</a><br>
=C2=A0 =C2=A0 &lt;mailto:<a href=3D"mailto:loa@mail01.huawei.com" target=3D=
"_blank">loa@mail01.huawei.com</a>&gt;<br>
=C2=A0 =C2=A0 Senior MPLS Expert <a href=3D"mailto:loa@pi.nu" target=3D"_bl=
ank">loa@pi.nu</a> &lt;mailto:<a href=3D"mailto:loa@pi.nu" target=3D"_blank=
">loa@pi.nu</a>&gt;<br>
=C2=A0 =C2=A0 Huawei Technologies (consultant)=C2=A0 =C2=A0 =C2=A0phone: <a=
 href=3D"tel:%2B46%20739%2081%2021%2064" value=3D"+46739812164" target=3D"_=
blank">+46 739 81 21 64</a><br>
=C2=A0 =C2=A0 &lt;tel:%2B46%20739%2081%2021%<u></u>2064&gt;<br>
<br>
=C2=A0 =C2=A0 ______________________________<u></u>___________________<br>
=C2=A0 =C2=A0 mpls mailing list<br>
=C2=A0 =C2=A0 <a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.=
org</a> &lt;mailto:<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@=
ietf.org</a>&gt;<br>
=C2=A0 =C2=A0 <a href=3D"https://www.ietf.org/mailman/__listinfo/mpls" targ=
et=3D"_blank">https://www.ietf.org/mailman/_<u></u>_listinfo/mpls</a><br>
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<br>
<br><span class=3D"HOEnZb"><font color=3D"#888888">
</font></span></blockquote><span class=3D"HOEnZb"><font color=3D"#888888">
<br>
-- <br>
<br>
<br>
Loa Andersson=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 email: <a href=3D"mailto:loa@mail01.huawei.com" targe=
t=3D"_blank">loa@mail01.huawei.com</a><br>
Senior MPLS Expert=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"mailto:loa@pi.nu" target=3D"_=
blank">loa@pi.nu</a><br>
Huawei Technologies (consultant)=C2=A0 =C2=A0 =C2=A0phone: <a href=3D"tel:%=
2B46%20739%2081%2021%2064" value=3D"+46739812164" target=3D"_blank">+46 739=
 81 21 64</a><br>
</font></span></blockquote></div><br></div>

--001a11c2ca3018f38105079b61b7--


From nobody Tue Nov 11 13:08:35 2014
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] poll to se if we have consensus to make draft-kini-mpls-spring-entropy-label an mpls wg document
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Subject: Re: [mpls] poll to se if we have consensus to make draft-kini-mpls-spring-entropy-label an mpls wg document
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Dear Authors, chairs, et. al,
I've read the current version of the draft and found that my major concern =
expressed in MPLS-RT comments is still valid. Hence I'm sending it again:
*       No illustration of how rules can be applied to the use case present=
ed in Section 3 to achieve desired load balancing. To make it more practica=
l different RLD values can be assigned to LSRs in the use case in Fig.1.
Entropy label in Segment Routing network is important and useful problem to=
 address, no doubt. But this is not a framework but solution document and I=
 believe that algorithm proposed in Section 4 must be applied to network ex=
ample presented in the Section 3 of the document to demonstrate that it wor=
ks, minimizes label stack depth while is beneficial in distribution of data=
 flows across available paths.

        Regards,
                Greg


-----Original Message-----
From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson
Sent: Tuesday, November 11, 2014 11:46 AM
To: mpls@ietf.org
Cc: mpls-chairs@tools.ietf.org; draft-kini-mpls-spring-entropy-label@tools.=
ietf.org
Subject: [mpls] poll to se if we have consensus to make draft-kini-mpls-spr=
ing-entropy-label an mpls wg document

Working Group,

This is to start a two week poll on adopting draft-kini-mpls-spring-entropy=
-label as an MPLS working group document.

Please send your comments (support/not support) to the mpls working group m=
ailing list (mpls@ietf.org<mailto:mpls@ietf.org>). Please give a technical =
motivation for your support/not support, especially if you think that the d=
ocument should not be adopted as a working group document.

There is no IPR disclosures directly against this document.

The authors has all stated on the working group mailing list that they are =
unaware of any IPR claims against this draft.

However we have an outstanding issue on IPRs. There were more than one solu=
tion to entropy labels for spring, they are referenced in the document, but=
 are labeled as "discounted". One of these proposed had an IPR disclosure.

However if you are on the the mpls working group mailing list and aware of =
IPR that relates to this draft, the time to disclose this is now.

This poll ends November 25, 2014.

/Loa
--


Loa Andersson                        email: loa@mail01.huawei.com<mailto:lo=
a@mail01.huawei.com>
Senior MPLS Expert                          loa@pi.nu<mailto:loa@pi.nu>
Huawei Technologies (consultant)     phone: +46 739 81 21 64

_______________________________________________
mpls mailing list
mpls@ietf.org<mailto:mpls@ietf.org>
https://www.ietf.org/mailman/listinfo/mpls


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<font face=3D"Calibri" size=3D"2"><span style=3D"font-size:11pt;">
<div>Dear Authors, chairs, et. al,</div>
<div>I've read the current version of the draft and found that my major con=
cern expressed in MPLS-RT comments is still valid. Hence I'm sending it aga=
in:</div>
<ul style=3D"margin:0;padding-left:36pt;">
<li>No illustration of how rules can be applied to the use case presented i=
n Section 3 to achieve desired load balancing. To make it more practical di=
fferent RLD values can be assigned to LSRs in the use case in Fig.1.</li></=
ul>
<div>Entropy label in Segment Routing network is important and useful probl=
em to address, no doubt. But this is not a framework but solution document =
and I believe that algorithm proposed in Section 4 must be applied to netwo=
rk example presented in the Section
3 of the document to demonstrate that it works, minimizes label stack depth=
 while is beneficial in distribution of data flows across available paths.<=
/div>
<div>&nbsp;</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Regards,</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp; Greg</div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>-----Original Message-----<br>

From: mpls [<a href=3D"mailto:mpls-bounces@ietf.org">mailto:mpls-bounces@ie=
tf.org</a>] On Behalf Of Loa Andersson<br>

Sent: Tuesday, November 11, 2014 11:46 AM<br>

To: mpls@ietf.org<br>

Cc: mpls-chairs@tools.ietf.org; draft-kini-mpls-spring-entropy-label@tools.=
ietf.org<br>

Subject: [mpls] poll to se if we have consensus to make draft-kini-mpls-spr=
ing-entropy-label an mpls wg document</div>
<div>&nbsp;</div>
<div>Working Group,</div>
<div>&nbsp;</div>
<div>This is to start a two week poll on adopting draft-kini-mpls-spring-en=
tropy-label as an MPLS working group document.</div>
<div>&nbsp;</div>
<div>Please send your comments (support/not support) to the mpls working gr=
oup mailing list (<a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>). Plea=
se give a technical motivation for your support/not support, especially if =
you think that the document should
not be adopted as a working group document.</div>
<div>&nbsp;</div>
<div>There is no IPR disclosures directly against this document.</div>
<div>&nbsp;</div>
<div>The authors has all stated on the working group mailing list that they=
 are unaware of any IPR claims against this draft.</div>
<div>&nbsp;</div>
<div>However we have an outstanding issue on IPRs. There were more than one=
 solution to entropy labels for spring, they are referenced in the document=
, but are labeled as &quot;discounted&quot;. One of these proposed had an I=
PR disclosure.</div>
<div>&nbsp;</div>
<div>However if you are on the the mpls working group mailing list and awar=
e of IPR that relates to this draft, the time to disclose this is now.</div=
>
<div>&nbsp;</div>
<div>This poll ends November 25, 2014.</div>
<div>&nbsp;</div>
<div>/Loa</div>
<div>-- </div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>Loa Andersson&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; email: <a href=3D"mailto:loa@mail01.huawei.com">loa@mail01.huawei.co=
m</a></div>
<div>Senior MPLS Expert&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"mailto:loa@pi.nu">loa@pi.nu</a></div>
<div>Huawei Technologies (consultant)&nbsp;&nbsp;&nbsp;&nbsp; phone: &#43;4=
6 739 81 21 64</div>
<div>&nbsp;</div>
<div>_______________________________________________</div>
<div>mpls mailing list</div>
<div><a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a></div>
<div><a href=3D"https://www.ietf.org/mailman/listinfo/mpls">https://www.iet=
f.org/mailman/listinfo/mpls</a></div>
<div>&nbsp;</div>
</span></font>
</body>
</html>

--_000_7347100B5761DC41A166AC17F22DF1121B87EB28eusaamb103erics_--


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From: "Aissaoui, Mustapha (Mustapha)" <mustapha.aissaoui@alcatel-lucent.com>
To: "Dutta, Pranjal K (Pranjal)" <pranjal.dutta@alcatel-lucent.com>, "Rajiv Asati (rajiva)" <rajiva@cisco.com>
Thread-Topic: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc closed)
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Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc closed)
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I just wanted to add that the explicit advertisement of support of a FEC ty=
pe in the session initialization is already used with mLDP P2MP and MP2MP F=
EC in RFC 6388 (sections 2.1 and 3.1 respectively). It is not new and we ar=
e just saying let us do the same thing for the IPv6 prefix FEC.

Regards,
Mustapha.

From: Dutta, Pranjal K (Pranjal)
Sent: Tuesday, November 11, 2014 3:30 PM
To: Aissaoui, Mustapha (Mustapha); Rajiv Asati (rajiva)
Cc: Ross Callon; mpls@ietf.org; mpls-chairs@tools.ietf.org; draft-ietf-mpls=
-ldp-ipv6@tools.ietf.org
Subject: RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc cl=
osed)

I had raised similar concerns earlier. Hacking up =93per adjacency specific=
=94 Dual-stack TLV to mean for =93session-level=94 IPV6 FEC and Address cap=
abilities is completely wrong thing to do.


1.      Dual stack TLV is sent per Hello adjacency on an interface and its =
purpose is bootstrapping LDP session. There could be multiple interface/adj=
acencies with a peering session. The capability in question is a session le=
vel capability and not per hello adjacency on an interface. Hacking up an a=
djacency level TLV to negotiate  IPV6 session capabilities is a complete di=
sconnect.



2.      LDP session capability framework is defined in RFC 5561. There is a=
n already defined method in draft-ietf-mpls-ldp-ip-pw-capability (SAC Capab=
ilities) which is based on RFC 5561 to negotiate IPV6 FEC Capabilities in a=
n LDP session. Currently SAC Capabilities limit to explicit advertisement o=
f do_not_support =3D -ve case only. Just adding the following clause into S=
AC Capability include the +ve case (explicit support) is a generic way and =
time-tested solution.


=93Implementations complying to this draft must advertise the IPv6 prefix s=
tate advertisement control capability (draft-ietf-mpls-ldp-ip-pw-capability=
) in the initialization message  explicitly indicating support for LDP IPv6=
 FEC. Without the peer advertising this capability, an LSR must not send IP=
v6 addresses and IPv6 FECs to that peer.=94

            It does not make sense for an implementation to hack an adjacen=
cy level TLV (Dual Stack TLV which was introduced for a complete different =
purpose)  for the +ve case and then use IPV6 SAC Capabilities for =96ve cas=
e). There needs to be only one way to fulfill one specific purpose. I am su=
rprised too to see such kind of proposals in a Standards track item which i=
s likely to exist for many years.

Thanks,
Pranjal

From: Aissaoui, Mustapha (Mustapha)
Sent: Monday, November 10, 2014 3:00 PM
To: Rajiv Asati (rajiva); Dutta, Pranjal K (Pranjal)
Cc: Ross Callon; mpls@ietf.org<mailto:mpls@ietf.org>; mpls-chairs@tools.iet=
f.org<mailto:mpls-chairs@tools.ietf.org>; draft-ietf-mpls-ldp-ipv6@tools.ie=
tf.org<mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org>
Subject: RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc cl=
osed)

Hi Rajiv,
We did not properly close this discussion and I noticed the draft was updat=
ed to use the dual-stack capability TLV in Hellos as a way to discover the =
LDP peer capability of handling IPv6 FECs and IPv6 addresses.

I am very surprised that we are deviating from the main LDP mechanism which=
 is the LDP capability as per RFC 5561. Furthermore, we only needed to disc=
over the IPv6 FEC and IPv6 address capabilities at the session level and no=
t at the Hello adjacency level. There is nothing which is specific to the a=
djacency here.

The dual-stack capability TLV has nothing to do with the FEC and address ca=
pability of an LSR, it is simply a way to handle preference for the control=
 plane establishment of the Hello adjacency. It is not a good precedent tha=
t this would be overloaded to indicate FEC and address capability advertise=
ment which is orthogonal to adjacency establishment.

I strongly believe that we simply needed to use the existing IPv6 capabilit=
y described in draft-ietf-mpls-ldp-ip-pw-capability,  which is extension of=
 LDP capabilities defined in RFC 5561. We could also define another capabil=
ity for the IPv6 addresses in that same draft if really required but I do n=
ot think we needed to. There needs to be only one method to do one thing an=
d draft-ietf-mpls-ldp-ip-pw-capability is the way to go  for any IPv6 FEC r=
elated =93session=94 capabilities.

To re-iterate, here is the proposal I made. Implementations complying to th=
is draft must advertise the IPv6 prefix state advertisement control capabil=
ity (draft-ietf-mpls-ldp-ip-pw-capability) in the initialization message ex=
plicitly indicating support for LDP IPv6 FEC. Without the peer advertising =
this capability, an LSR must not send IPv6 addresses and IPv6 FECs to that =
peer.

There was one individual support for this proposal on this mailing list and=
 I thus consider the discussion was not properly closed.

Regards,
Mustapha.

From: Dutta, Pranjal K (Pranjal)
Sent: Tuesday, September 02, 2014 5:33 PM
To: Aissaoui, Mustapha (Mustapha); Rajiv Asati (rajiva)
Cc: Ross Callon; mpls@ietf.org<mailto:mpls@ietf.org>; mpls-chairs@tools.iet=
f.org<mailto:mpls-chairs@tools.ietf.org>; draft-ietf-mpls-ldp-ipv6@tools.ie=
tf.org<mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org>
Subject: RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc cl=
osed)


I second to Mustapha. We should use features for what they are designed for=
. It is the SAC capability (draft-ietf-mpls-ldp-ip-pw-capability-07) that d=
efines the negotiation of IPV4/IPV6 Prefix FEC Capabilities in LDP session,=
 which fits into the required inter-op solution organically.



I do not consider explicit advertisement of IPv6 Prefix FEC SAC (D =3D 0) i=
n Initialization message can be seen as baggage. An implementation that doe=
s not want to receive IPv6 Prefix FECs will send D=3D1 in Initialization me=
ssage anyways.



Cheers,

Pranjal



-----Original Message-----
From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Aissaoui, Mustapha (=
Mustapha)
Sent: Tuesday, September 02, 2014 11:57 AM
To: Rajiv Asati (rajiva)
Cc: Ross Callon; mpls@ietf.org<mailto:mpls@ietf.org>; mpls-chairs@tools.iet=
f.org<mailto:mpls-chairs@tools.ietf.org>; draft-ietf-mpls-ldp-ipv6@tools.ie=
tf.org<mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org>
Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc cl=
osed)



Hi Rajiv,

I think the key point I am trying to convey is that we should keep the prot=
ocol clean and use features for what they are designed for. LDP has its own=
 capability advertisement and it is meant to address issues like this one.



Overloading the TR field of the initialization message means that a peer wi=
ll have to check both the TR and the SAC to decide what to do for the IPv6 =
prefix FEC while it is sufficient to check the SAC for all other FEC types.=
 This is inconsistent and will cause an unnecessary exception in the protoc=
ol.



Also, using the LDP advertisement capability is not a baggage in the future=
. This mechanism is used with mLDP P2P and MP2MP FECs and this is working f=
ine today although many implementations now support these types of FECs.



As for changing other drafts, we are simply talking about stating in draft-=
ietf-mpls-ldp-ip-pw-capability-07 that an LDP peer must set D-bit=3D0  in I=
Pv6 prefix FEC SAC in the initialization message.



Regards,

Mustapha.



> -----Original Message-----

> From: Rajiv Asati (rajiva) [mailto:rajiva@cisco.com]

> Sent: Saturday, August 30, 2014 7:19 AM

> To: Aissaoui, Mustapha (Mustapha)

> Cc: Ross Callon; mpls@ietf.org<mailto:mpls@ietf.org>; mpls-chairs@tools.i=
etf.org<mailto:mpls-chairs@tools.ietf.org>;

> draft-ietf-mpls-ldp- ipv6@tools.ietf.org<mailto:ipv6@tools.ietf.org>

> Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short

> wglc closed)

>

> Hi Mustapha,

>

> TR field is useful in case of dual-stack environment and using it for

> determining whether the peer implementation is compliant (wrt handling

> v6 address bindings and label bindings) is simple and straight forward.

>

> When v6-only peer implementations exist (and become a new norm), TR

> field usage would become moot. And we wouldn't have to see them. A

> very good thing, IMO.

>

> We need to think about how much of this baggage needs to carry over

> when single- stack ipv6 networks become a new norm (like single-stack ipv=
4 has been).

>

> Given that this draft already has built-in means to accommodate the

> RFC5036 non- compliant peer issue and do so in a simple manner, it is

> not necessary to require changing other drafts, IMO.

>

>

> Cheers,

> Raj

>

>

> PS; While there are multiple types of FECs, and it would be wise to

> dictate the default behavior (v6 FECs advertised) in v6-only

> environment with an option to change it. This is nothing different from c=
urrent protocol machinery.

>

>

> > On Aug 29, 2014, at 8:25 PM, "Aissaoui, Mustapha (Mustapha)"

> <mustapha.aissaoui@alcatel-lucent .com<mailto:mustapha.aissaoui@alcatel-l=
ucent%20.com>> wrote:

> >

> > Hi Rajiv,

> > See inline below for some follow-up.

> >

> > Regards,

> > Mustapha.

> >

> >> -----Original Message-----

> >> From: Rajiv Asati (rajiva) [mailto:rajiva@cisco.com]

> >> Sent: Wednesday, August 27, 2014 7:19 PM

> >> To: Ross Callon; Aissaoui, Mustapha (Mustapha); mpls@ietf.org<mailto:m=
pls@ietf.org>

> >> Cc: mpls-chairs@tools.ietf.org<mailto:mpls-chairs@tools.ietf.org>;

> >> draft-ietf-mpls-ldp-ipv6@tools.ietf.org<mailto:draft-ietf-mpls-ldp-ipv=
6@tools.ietf.org>

> >> Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short

> >> wglc closed)

> >>

> >>

> >> If this draft were to address the interoperability with rfc5036

> >> non-compliant implementations, then it would be easier to rather

> >> leverage the =8Ctransport preference=B9 TLV that is already part of th=
e version 13.

> >> This TLV was defined after the getting Adrian's and George=B9s feedbac=
k.

> >>

> >> http://tools.ietf.org/html/draft-ietf-mpls-ldp-ipv6-13#section-6.1.

> >> 1

> > MA> It is not a good idea to overload this new TLV with a capability

> > MA> advertisement

> role. LDP has its own capability advertisement mechanism and there is

> no need to confuse implementations with the handling of two mechanisms.

> >

> >> The reason for not agreeing to the alternate solution (of using IP

> >> Prefix capability

> >> etc.) is 2-fold:

> >>

> >> - not forward compatible (consider a deployment 5 yrs from now -

> >> IPv6-only MPLS network - now, the LSR will be expecting an

> >> unnecessary IPv6 prefix capability advertisement, and that=B9s not

> >> optimal, if not annoying)

> > MA> IPv6-only network is not synonymous with a single FEC type

> > MA> network. It will

> support many types of FECs  in addition to the IPv6 prefix FEC: mLDP

> IPv6 FECs, PW FECs, IPv4 prefix FEC, etc. The LDP capabilities have

> been designed for the purpose of explicitly enabling or disabling

> capabilities including FEC type support on a given session.

> >

> >> - not 100% backward compatible (does not solve the advertisement of

> >> v6 address binding to a v4 neighbor (which can also cause an outage

> >> to a non-compliant peer))

> > MA> I think it makes sense to tie the exchange of both IPv6 address

> > MA> messages

> and IPv6 prefix FECs to the advertisement of the IPv6 capability by

> both peers. If however there is a use case for decoupling the

> advertising of IPv6 addresses from

> IPv6 FECs, then a separate capability can be devised for addresses but

> I do not think we need it.

> >

> >

> >> Thanks.

> >>

> >>

> >> --

> >> Cheers,

> >> Rajiv Asati

> >> Distinguished Engineer, Cisco

> >>

> >>

> >>

> >>

> >>

> >> -----Original Message-----

> >> From: Ross Callon <rcallon@juniper.net<mailto:rcallon@juniper.net>>

> >> Date: Friday, August 22, 2014 at 4:34 PM

> >> To: Mustapha Aissaoui <mustapha.aissaoui@alcatel-lucent.com<mailto:mus=
tapha.aissaoui@alcatel-lucent.com>>,

> >> "mpls@ietf.org<mailto:mpls@ietf.org>" <mpls@ietf.org<mailto:mpls@ietf.=
org>>

> >> Cc: "mpls-chairs@tools.ietf.org<mailto:mpls-chairs@tools.ietf.org>" <m=
pls-chairs@tools.ietf.org<mailto:mpls-chairs@tools.ietf.org>>,

> >> "draft-ietf-mpls-ldp-ipv6@tools.ietf.org<mailto:draft-ietf-mpls-ldp-ip=
v6@tools.ietf.org>"

> >> <draft-ietf-mpls-ldp-ipv6@tools.ietf.org<mailto:draft-ietf-mpls-ldp-ip=
v6@tools.ietf.org>>

> >> Subject: RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short

> >> wglc

> >> closed)

> >> Resent-From: <draft-alias-bounces@tools.ietf.org<mailto:draft-alias-bo=
unces@tools.ietf.org>>

> >> Resent-To: Carlos Pignataro <cpignata@cisco.com<mailto:cpignata@cisco.=
com>>, Rajiv Papneja

> >> <rajiv.papneja@huawei.com<mailto:rajiv.papneja@huawei.com>>, Rajiv Asa=
ti <rajiva@cisco.com<mailto:rajiva@cisco.com>>, Vishwas

> >> Manral <vishwas.manral@hp.com<mailto:vishwas.manral@hp.com>>, <swallow=
@cisco.com<mailto:swallow@cisco.com>>, Loa Andersson

> >> <loa@pi.nu<mailto:loa@pi.nu>>, Ross Callon <rcallon@juniper.net<mailto=
:rcallon@juniper.net>>, MARTIN VIGOUREUX

> >> <martin.vigoureux@alcatel-lucent.com<mailto:martin.vigoureux@alcatel-l=
ucent.com>>

> >> Resent-Date: Friday, August 22, 2014 at 4:35 PM

> >>

> >>>> The proposed solution is to have implementations complying to

> >>>> this draft advertise the IPv6 prefix state advertisement control

> >>>> capability

> >>>> (draft-ietf-mpls-ldp-ip-pw-capability-07) in the initialization

> >>>> message explicitly indicating support for LDP IPv6. Without the

> >>>> peer advertising this capability, an LSR must not send IPv6

> >>>> addresses and FECs to that peer.

> >>>

> >>> Speaking as an individual contributor, this seems IMHO to be the

> >>> right solution (noting that, in final text as would be published

> >>> in an RFC, the "must not" in the last sentence should be capitalized)=
.

> >>>

> >>> Thanks, Ross

> >>>

> >>> -----Original Message-----

> >>> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Aissaoui,

> >>> Mustapha

> >>> (Mustapha)

> >>> Sent: Tuesday, August 19, 2014 3:19 AM

> >>> To: mpls@ietf.org<mailto:mpls@ietf.org>

> >>> Cc: mpls-chairs@tools.ietf.org<mailto:mpls-chairs@tools.ietf.org>;

> >>> draft-ietf-mpls-ldp-ipv6@tools.ietf.org<mailto:draft-ietf-mpls-ldp-ip=
v6@tools.ietf.org>

> >>> Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6

> >>> (short wglc

> >>> closed)

> >>>

> >>> Dear all,

> >>> The following are the details of the issue we found and the

> >>> proposed solution. We shared this first with the authors to get initi=
al feedback.

> >>>

> >>> When an LSR which supports LDP IPv6 according to this draft is in

> >>> a LAN with a broadcast interface, it can peer with LSRs which

> >>> support this draft and LSRs which do not. When it peers using IPv4

> >>> LDP control plane with an LSR which does not support this draft,

> >>> we have seen during our testing an issue that the advertisement of

> >>> IPv6 addresses or IPv6 FECs to that peer will cause it to bring

> >>> down the IPv4 LDP

> session.

> >>>

> >>> In other words, there are deployed LDP implementations which are

> >>> compliant to RFC 5036 for LDP IPv4 but are not compliant to RFC

> >>> 5036 when it comes to handling IPv6 address or IPv6 FECs over an

> >>> LDP IPv4

> session.

> >>> This is making us very concerned that when users enable dual-stack

> >>> LDP IPv4/IPv6, they will bring down LDP IPv4 sessions which have

> >>> been working in a multi-vendor environments for so many years.

> >>>

> >>> The proposed solution is to have implementations complying to this

> >>> draft advertise the IPv6 prefix state advertisement control

> >>> capability

> >>> (draft-ietf-mpls-ldp-ip-pw-capability-07) in the initialization

> >>> message explicitly indicating support for LDP IPv6. Without the

> >>> peer advertising this capability, an LSR must not send IPv6

> >>> addresses and FECs to that peer.

> >>>

> >>> This approach is safer and has been followed when mLDP FEC was

> >>> introduced as explained in Section 2.1 of RFC 6388. Also, this

> >>> does not introduce any new TLV to draft-ietf-mpls-ldp-ipv6. It

> >>> just makes the exchange of LDP IPv6 addresses and FECs conditional

> >>> to both peers explicitly indicating support for IPv6 capability

> >>> during LDP session

> initialization.

> >>>

> >>> We do not feel such a simple change justifies writing a new draft

> >>> and having to deal with backward compatibility of implementations

> >>> across two drafts.

> >>>

> >>> We appreciate your comments on this matter.

> >>>

> >>> Regards,

> >>> Mustapha.

> >>>

> >>>

> >>>> -----Original Message-----

> >>>> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa

> >>>> Andersson

> >>>> Sent: Tuesday, August 12, 2014 11:45 AM

> >>>> To: mpls@ietf.org<mailto:mpls@ietf.org>; mpls-chairs@tools.ietf.org<=
mailto:mpls-chairs@tools.ietf.org>;

> >>>> draft-ietf-mpls-ldp-ipv6@tools.ietf.org<mailto:draft-ietf-mpls-ldp-i=
pv6@tools.ietf.org>

> >>>> Subject: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short

> >>>> wglc

> >>>> closed)

> >>>>

> >>>> Working Group,

> >>>>

> >>>> During what we thought would be a short wglc on

> >>>> draft-ietf-mpls-ldp-ipv6

> >>>> http://www.ietf.org/mail-archive/web/mpls/current/msg12464.html

> >>>> we had a comment that stopped us from continuing progressing the dra=
ft.

> >>>>

> >>>> The short working group last call is now closed!

> >>>>

> >>>> The comment we refer to was raised in a private mail to the

> >>>> working group chairs and the draft authors.

> >>>>

> >>>> It says that there are a problem with some RFC 5036 non-compliant

> >>>> implementations deployed and draft-ietf-mpls-ldp-ipv6. There is

> >>>> no detailed description of the exact problems.

> >>>>

> >>>> We strongly encourage the people that made the comment(s) to

> >>>> write-up the problem, either as

> >>>>

> >>>> - a new draft (preferred); or

> >>>> - in a mail to the working group mailing list

> >>>>

> >>>> Once we an agreement to write a new draft or the write-up to the

> >>>> mailing, we will continue to ask the working group to see if we

> >>>> can agree to a way to progress. We like to see this write-up

> >>>> before September 1. Failing this we will continue to progress the

> >>>> draft-ietf-mpls-ldp-ipv6 as is.

> >>>>

> >>>> /Loa

> >>>> for the working group chairs

> >>>> --

> >>>>

> >>>>

> >>>> Loa Andersson                        email: loa@mail01.huawei.com<ma=
ilto:loa@mail01.huawei.com>

> >>>> Senior MPLS Expert                          loa@pi.nu<mailto:loa@pi.=
nu>

> >>>> Huawei Technologies (consultant)     phone: +46 739 81 21 64

> >>>>

> >>>> _______________________________________________

> >>>> mpls mailing list

> >>>> mpls@ietf.org<mailto:mpls@ietf.org>

> >>>> https://www.ietf.org/mailman/listinfo/mpls

> >>>

> >>> _______________________________________________

> >>> mpls mailing list

> >>> mpls@ietf.org<mailto:mpls@ietf.org>

> >>> https://www.ietf.org/mailman/listinfo/mpls

> >



_______________________________________________

mpls mailing list

mpls@ietf.org<mailto:mpls@ietf.org>

https://www.ietf.org/mailman/listinfo/mpls

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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">I just wanted to add that the explicit advertisement of su=
pport of a FEC type in the session initialization is already used with mLDP=
 P2MP and MP2MP FEC in RFC 6388 (sections 2.1 and 3.1 respectively).
 It is not new and we are just saying let us do the same thing for the IPv6=
 prefix FEC.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">Mustapha.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> Dutta, P=
ranjal K (Pranjal)
<br>
<b>Sent:</b> Tuesday, November 11, 2014 3:30 PM<br>
<b>To:</b> Aissaoui, Mustapha (Mustapha); Rajiv Asati (rajiva)<br>
<b>Cc:</b> Ross Callon; mpls@ietf.org; mpls-chairs@tools.ietf.org; draft-ie=
tf-mpls-ldp-ipv6@tools.ietf.org<br>
<b>Subject:</b> RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short =
wglc closed)<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Times New Roman&quo=
t;,&quot;serif&quot;;color:#1F497D">I had raised similar concerns earlier. =
Hacking up =93per adjacency specific=94 Dual-stack TLV to mean for =93sessi=
on-level=94 IPV6 FEC and Address capabilities is completely wrong
 thing to do.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Times New Roman&quo=
t;,&quot;serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"font-family:&quot;Times New Rom=
an&quot;,&quot;serif&quot;;color:#1F497D"><span style=3D"mso-list:Ignore">1=
.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"font-family:&quot;Times New R=
oman&quot;,&quot;serif&quot;;color:#1F497D">Dual stack TLV is sent per Hell=
o adjacency on an interface and its purpose is bootstrapping LDP session. T=
here could be multiple interface/adjacencies with a peering
 session. The capability in question is a session level capability and not =
per hello adjacency on an interface. Hacking up an adjacency level TLV to n=
egotiate&nbsp; IPV6 session capabilities is a complete disconnect.<o:p></o:=
p></span></p>
<p class=3D"MsoListParagraph"><span style=3D"font-family:&quot;Times New Ro=
man&quot;,&quot;serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"font-family:&quot;Times New Rom=
an&quot;,&quot;serif&quot;;color:#1F497D"><span style=3D"mso-list:Ignore">2=
.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"font-family:&quot;Times New R=
oman&quot;,&quot;serif&quot;;color:#1F497D">LDP session capability framewor=
k is defined in RFC 5561. There is an already defined method in draft-ietf-=
mpls-ldp-ip-pw-capability (SAC Capabilities) which is
 based on RFC 5561 to negotiate IPV6 FEC Capabilities in an LDP session. Cu=
rrently SAC Capabilities limit to explicit advertisement of do_not_support =
=3D -ve case only. Just adding the following clause into SAC Capability inc=
lude the &#43;ve case (explicit support)
 is a generic way and time-tested solution.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span style=3D"font-family:&quot;Times New Ro=
man&quot;,&quot;serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-famil=
y:&quot;Arial&quot;,&quot;sans-serif&quot;">=93Implementations complying to=
 this draft must advertise the IPv6 prefix state advertisement control capa=
bility (draft-ietf-mpls-ldp-ip-pw-capability) in the initialization
 message &nbsp;explicitly indicating support for LDP IPv6 FEC. Without the =
peer advertising this capability, an LSR must not send IPv6 addresses and I=
Pv6 FECs to that peer.=94<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Times New Roman&quo=
t;,&quot;serif&quot;;color:#1F497D">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp; It does not make sense for an implementation to=
 hack an adjacency level TLV (Dual Stack TLV which was introduced for a com=
plete different purpose) &nbsp;for the &#43;ve
 case and then use IPV6 SAC Capabilities for =96ve case). There needs to be=
 only one way to fulfill one specific purpose. I am surprised too to see su=
ch kind of proposals in a Standards track item which is likely to exist for=
 many years.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Times New Roman&quo=
t;,&quot;serif&quot;;color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Times New Roman&quo=
t;,&quot;serif&quot;;color:#1F497D">Pranjal<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> Aissaoui=
, Mustapha (Mustapha)
<br>
<b>Sent:</b> Monday, November 10, 2014 3:00 PM<br>
<b>To:</b> Rajiv Asati (rajiva); Dutta, Pranjal K (Pranjal)<br>
<b>Cc:</b> Ross Callon; <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>;=
 <a href=3D"mailto:mpls-chairs@tools.ietf.org">
mpls-chairs@tools.ietf.org</a>; <a href=3D"mailto:draft-ietf-mpls-ldp-ipv6@=
tools.ietf.org">
draft-ietf-mpls-ldp-ipv6@tools.ietf.org</a><br>
<b>Subject:</b> RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short =
wglc closed)<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">Hi Rajiv,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">We did not properly close this discussion and I noticed th=
e draft was updated to use the dual-stack capability TLV in Hellos as a way=
 to discover the LDP peer capability of handling IPv6 FECs
 and IPv6 addresses. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">I am very surprised that we are deviating from the main LD=
P mechanism which is the LDP capability as per RFC 5561. Furthermore, we on=
ly needed to discover the IPv6 FEC and IPv6 address capabilities
 at the session level and not at the Hello adjacency level. There is nothin=
g which is specific to the adjacency here.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">The dual-stack capability TLV has nothing to do with the F=
EC and address capability of an LSR, it is simply a way to handle preferenc=
e for the control plane establishment of the Hello adjacency.
 It is not a good precedent that this would be overloaded to indicate FEC a=
nd address capability advertisement which is orthogonal to adjacency establ=
ishment.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">I strongly believe that we simply needed to use the existi=
ng IPv6 capability described in draft-ietf-mpls-ldp-ip-pw-capability,&nbsp;=
 which is extension of LDP capabilities defined in RFC 5561.
 We could also define another capability for the IPv6 addresses in that sam=
e draft if really required but I do not think we needed to. There needs to =
be only one method to do one thing and draft-ietf-mpls-ldp-ip-pw-capability=
 is the way to go&nbsp; for any IPv6
 FEC related =93session=94 capabilities.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">To re-iterate, here is the proposal I made. Implementation=
s complying to this draft must advertise the IPv6 prefix state advertisemen=
t control capability (draft-ietf-mpls-ldp-ip-pw-capability)
 in the initialization message explicitly indicating support for LDP IPv6 F=
EC. Without the peer advertising this capability, an LSR must not send IPv6=
 addresses and IPv6 FECs to that peer.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">There was one individual support for this proposal on this=
 mailing list and I thus consider the discussion was not properly closed.<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">Mustapha.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> Dutta, P=
ranjal K (Pranjal)
<br>
<b>Sent:</b> Tuesday, September 02, 2014 5:33 PM<br>
<b>To:</b> Aissaoui, Mustapha (Mustapha); Rajiv Asati (rajiva)<br>
<b>Cc:</b> Ross Callon; <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>;=
 <a href=3D"mailto:mpls-chairs@tools.ietf.org">
mpls-chairs@tools.ietf.org</a>; <a href=3D"mailto:draft-ietf-mpls-ldp-ipv6@=
tools.ietf.org">
draft-ietf-mpls-ldp-ipv6@tools.ietf.org</a><br>
<b>Subject:</b> RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short =
wglc closed)<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:12.0pt;font-family:&quot=
;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D">I second to Mustaph=
a. We should use features for what they are designed for. It is the SAC cap=
ability (draft-ietf-mpls-ldp-ip-pw-capability-07) that defines
 the negotiation of IPV4/IPV6 Prefix FEC Capabilities in LDP session, which=
 fits into the required inter-op solution organically.<o:p></o:p></span></p=
>
<p class=3D"MsoPlainText"><span style=3D"font-size:12.0pt;font-family:&quot=
;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:12.0pt;font-family:&quot=
;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D">I do not consider e=
xplicit advertisement of IPv6 Prefix FEC SAC (D =3D 0) in Initialization me=
ssage can be seen as baggage. An implementation that does
 not want to receive IPv6 Prefix FECs will send D=3D1 in Initialization mes=
sage anyways.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:12.0pt;font-family:&quot=
;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D">Cheers,<o:p></o:p><=
/span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:12.0pt;font-family:&quot=
;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D">Pranjal<o:p></o:p><=
/span></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">-----Original Message-----<br>
From: mpls [<a href=3D"mailto:mpls-bounces@ietf.org">mailto:mpls-bounces@ie=
tf.org</a>] On Behalf Of Aissaoui, Mustapha (Mustapha)<br>
Sent: Tuesday, September 02, 2014 11:57 AM<br>
To: Rajiv Asati (rajiva)<br>
Cc: Ross Callon; <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>; <a hre=
f=3D"mailto:mpls-chairs@tools.ietf.org">
mpls-chairs@tools.ietf.org</a>; <a href=3D"mailto:draft-ietf-mpls-ldp-ipv6@=
tools.ietf.org">
draft-ietf-mpls-ldp-ipv6@tools.ietf.org</a><br>
Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc cl=
osed)<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Hi Rajiv,<o:p></o:p></p>
<p class=3D"MsoPlainText">I think the key point I am trying to convey is th=
at we should keep the protocol clean and use features for what they are des=
igned for. LDP has its own capability advertisement and it is meant to addr=
ess issues like this one.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Overloading the TR field of the initialization me=
ssage means that a peer will have to check both the TR and the SAC to decid=
e what to do for the IPv6 prefix FEC while it is sufficient to check the SA=
C for all other FEC types. This is
 inconsistent and will cause an unnecessary exception in the protocol.<o:p>=
</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Also, using the LDP advertisement capability is n=
ot a baggage in the future. This mechanism is used with mLDP P2P and MP2MP =
FECs and this is working fine today although many implementations now suppo=
rt these types of FECs.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">As for changing other drafts, we are simply talki=
ng about stating in draft-ietf-mpls-ldp-ip-pw-capability-07 that an LDP pee=
r must set D-bit=3D0&nbsp; in IPv6 prefix FEC SAC in the initialization mes=
sage.
<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Regards,<o:p></o:p></p>
<p class=3D"MsoPlainText">Mustapha.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&gt; -----Original Message-----<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; From: Rajiv Asati (rajiva) [<a href=3D"mailt=
o:rajiva@cisco.com"><span style=3D"color:windowtext;text-decoration:none">m=
ailto:rajiva@cisco.com</span></a>]<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Sent: Saturday, August 30, 2014 7:19 AM<o:p>=
</o:p></p>
<p class=3D"MsoPlainText">&gt; To: Aissaoui, Mustapha (Mustapha)<o:p></o:p>=
</p>
<p class=3D"MsoPlainText">&gt; Cc: Ross Callon; <a href=3D"mailto:mpls@ietf=
.org"><span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</=
span></a>;
<a href=3D"mailto:mpls-chairs@tools.ietf.org"><span style=3D"color:windowte=
xt;text-decoration:none">mpls-chairs@tools.ietf.org</span></a>;
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; draft-ietf-mpls-ldp- <a href=3D"mailto:ipv6@=
tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">ipv6@tools.ietf.org</=
span></a><o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Subject: Re: [mpls] Way to progress draft-ie=
tf-mpls-ldp-ipv6 (short
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; wglc closed)<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Hi Mustapha,<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; TR field is useful in case of dual-stack env=
ironment and using it for
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; determining whether the peer implementation =
is compliant (wrt handling
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; v6 address bindings and label bindings) is s=
imple and straight forward.<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; When v6-only peer implementations exist (and=
 become a new norm), TR
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; field usage would become moot. And we wouldn=
't have to see them. A
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; very good thing, IMO.<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; We need to think about how much of this bagg=
age needs to carry over
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; when single- stack ipv6 networks become a ne=
w norm (like single-stack ipv4 has been).<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Given that this draft already has built-in m=
eans to accommodate the
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; RFC5036 non- compliant peer issue and do so =
in a simple manner, it is
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; not necessary to require changing other draf=
ts, IMO.<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Cheers,<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Raj<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; PS; While there are multiple types of FECs, =
and it would be wise to
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; dictate the default behavior (v6 FECs advert=
ised) in v6-only
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; environment with an option to change it. Thi=
s is nothing different from current protocol machinery.<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt; On Aug 29, 2014, at 8:25 PM, &quot;Aiss=
aoui, Mustapha (Mustapha)&quot;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &lt;<a href=3D"mailto:mustapha.aissaoui@alca=
tel-lucent%20.com"><span style=3D"color:windowtext;text-decoration:none">mu=
stapha.aissaoui@alcatel-lucent .com</span></a>&gt; wrote:<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt; Hi Rajiv,<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt; See inline below for some follow-up.<o:=
p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt; Regards,<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt; Mustapha.<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; -----Original Message-----<o:p></o:=
p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; From: Rajiv Asati (rajiva) [<a href=
=3D"mailto:rajiva@cisco.com"><span style=3D"color:windowtext;text-decoratio=
n:none">mailto:rajiva@cisco.com</span></a>]<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; Sent: Wednesday, August 27, 2014 7:=
19 PM<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; To: Ross Callon; Aissaoui, Mustapha=
 (Mustapha); <a href=3D"mailto:mpls@ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</span><=
/a><o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; Cc: <a href=3D"mailto:mpls-chairs@t=
ools.ietf.org"><span style=3D"color:windowtext;text-decoration:none">mpls-c=
hairs@tools.ietf.org</span></a>;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; <a href=3D"mailto:draft-ietf-mpls-l=
dp-ipv6@tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">draft-ietf-mpls-ldp-i=
pv6@tools.ietf.org</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; Subject: Re: [mpls] Way to progress=
 draft-ietf-mpls-ldp-ipv6 (short
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; wglc closed)<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; If this draft were to address the i=
nteroperability with rfc5036
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; non-co=
mpliant implementations, then it would be easier to rather
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; levera=
ge the =8Ctransport preference=B9 TLV that is already part of the version 1=
3.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; This T=
LV was defined after the getting Adrian's and George=B9s feedback.<o:p></o:=
p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; <a hre=
f=3D"http://tools.ietf.org/html/draft-ietf-mpls-ldp-ipv6-13#section-6.1">
<span style=3D"color:windowtext;text-decoration:none">http://tools.ietf.org=
/html/draft-ietf-mpls-ldp-ipv6-13#section-6.1</span></a>.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; 1<o:p>=
</o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; It =
is not a good idea to overload this new TLV with a capability
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; adv=
ertisement<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; role. LDP has i=
ts own capability advertisement mechanism and there is
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; no need to conf=
use implementations with the handling of two mechanisms.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;<o:p></o:p>=
</p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; The re=
ason for not agreeing to the alternate solution (of using IP
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Prefix=
 capability<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; etc.) =
is 2-fold:<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; - not =
forward compatible (consider a deployment 5 yrs from now -
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; IPv6-o=
nly MPLS network - now, the LSR will be expecting an
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; unnece=
ssary IPv6 prefix capability advertisement, and that=B9s not
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; optima=
l, if not annoying)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; IPv=
6-only network is not synonymous with a single FEC type
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; net=
work. It will<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; support many ty=
pes of FECs&nbsp; in addition to the IPv6 prefix FEC: mLDP
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt"><span lang=3D"FR-CA"=
>&gt; IPv6 FECs, PW FECs, IPv4 prefix FEC, etc.
</span>The LDP capabilities have <o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; been designed f=
or the purpose of explicitly enabling or disabling
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; capabilities in=
cluding FEC type support on a given session.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;<o:p></o:p>=
</p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; - not =
100% backward compatible (does not solve the advertisement of<o:p></o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; v6 add=
ress binding to a v4 neighbor (which can also cause an outage
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; to a n=
on-compliant peer))<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; I t=
hink it makes sense to tie the exchange of both IPv6 address
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; mes=
sages<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; and IPv6 prefix=
 FECs to the advertisement of the IPv6 capability by
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; both peers. If =
however there is a use case for decoupling the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; advertising of =
IPv6 addresses from<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; IPv6 FECs, then=
 a separate capability can be devised for addresses but
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; I do not think =
we need it.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;<o:p></o:p>=
</p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;<o:p></o:p>=
</p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Thanks=
.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; --<o:p=
></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Cheers=
,<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Rajiv =
Asati<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Distin=
guished Engineer, Cisco<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; -----O=
riginal Message-----<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; From: =
Ross Callon &lt;<a href=3D"mailto:rcallon@juniper.net"><span style=3D"color=
:windowtext;text-decoration:none">rcallon@juniper.net</span></a>&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Date: =
Friday, August 22, 2014 at 4:34 PM<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; To: Mu=
stapha Aissaoui &lt;<a href=3D"mailto:mustapha.aissaoui@alcatel-lucent.com"=
><span style=3D"color:windowtext;text-decoration:none">mustapha.aissaoui@al=
catel-lucent.com</span></a>&gt;,<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; &quot;=
<a href=3D"mailto:mpls@ietf.org"><span style=3D"color:windowtext;text-decor=
ation:none">mpls@ietf.org</span></a>&quot; &lt;<a href=3D"mailto:mpls@ietf.=
org"><span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</s=
pan></a>&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Cc: &q=
uot;<a href=3D"mailto:mpls-chairs@tools.ietf.org"><span style=3D"color:wind=
owtext;text-decoration:none">mpls-chairs@tools.ietf.org</span></a>&quot; &l=
t;<a href=3D"mailto:mpls-chairs@tools.ietf.org"><span style=3D"color:window=
text;text-decoration:none">mpls-chairs@tools.ietf.org</span></a>&gt;,
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; &quot;=
<a href=3D"mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org"><span style=3D"c=
olor:windowtext;text-decoration:none">draft-ietf-mpls-ldp-ipv6@tools.ietf.o=
rg</span></a>&quot;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; &lt;<a=
 href=3D"mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org"><span style=3D"col=
or:windowtext;text-decoration:none">draft-ietf-mpls-ldp-ipv6@tools.ietf.org=
</span></a>&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Subjec=
t: RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; wglc<o=
:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; closed=
)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Resent=
-From: &lt;<a href=3D"mailto:draft-alias-bounces@tools.ietf.org"><span styl=
e=3D"color:windowtext;text-decoration:none">draft-alias-bounces@tools.ietf.=
org</span></a>&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Resent=
-To: Carlos Pignataro &lt;<a href=3D"mailto:cpignata@cisco.com"><span style=
=3D"color:windowtext;text-decoration:none">cpignata@cisco.com</span></a>&gt=
;, Rajiv Papneja
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; &lt;<a=
 href=3D"mailto:rajiv.papneja@huawei.com"><span style=3D"color:windowtext;t=
ext-decoration:none">rajiv.papneja@huawei.com</span></a>&gt;, Rajiv Asati &=
lt;<a href=3D"mailto:rajiva@cisco.com"><span style=3D"color:windowtext;text=
-decoration:none">rajiva@cisco.com</span></a>&gt;,
 Vishwas <o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Manral=
 &lt;<a href=3D"mailto:vishwas.manral@hp.com"><span style=3D"color:windowte=
xt;text-decoration:none">vishwas.manral@hp.com</span></a>&gt;, &lt;<a href=
=3D"mailto:swallow@cisco.com"><span style=3D"color:windowtext;text-decorati=
on:none">swallow@cisco.com</span></a>&gt;,
 Loa Andersson <o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt"><span lang=3D"FR-CA"=
>&gt; &gt;&gt; &lt;</span><a href=3D"mailto:loa@pi.nu"><span lang=3D"FR-CA"=
 style=3D"color:windowtext;text-decoration:none">loa@pi.nu</span></a><span =
lang=3D"FR-CA">&gt;, Ross Callon &lt;</span><a href=3D"mailto:rcallon@junip=
er.net"><span lang=3D"FR-CA" style=3D"color:windowtext;text-decoration:none=
">rcallon@juniper.net</span></a><span lang=3D"FR-CA">&gt;,
 MARTIN VIGOUREUX <o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt"><span lang=3D"FR-CA"=
>&gt; &gt;&gt; &lt;</span><a href=3D"mailto:martin.vigoureux@alcatel-lucent=
.com"><span lang=3D"FR-CA" style=3D"color:windowtext;text-decoration:none">=
martin.vigoureux@alcatel-lucent.com</span></a><span lang=3D"FR-CA">&gt;<o:p=
></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Resent=
-Date: Friday, August 22, 2014 at 4:35 PM<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; The proposed solution is to have implementations complying to
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; this draft advertise the IPv6 prefix state advertisement control
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; capability<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; (draft-ietf-mpls-ldp-ip-pw-capability-07) in the initialization
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; message explicitly indicating support for LDP IPv6. Without the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; peer advertising this capability, an LSR must not send IPv6
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; addresses and FECs to that peer.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Sp=
eaking as an individual contributor, this seems IMHO to be the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; ri=
ght solution (noting that, in final text as would be published
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; in=
 an RFC, the &quot;must not&quot; in the last sentence should be capitalize=
d).<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Th=
anks, Ross<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; --=
---Original Message-----<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Fr=
om: mpls [<a href=3D"mailto:mpls-bounces@ietf.org"><span style=3D"color:win=
dowtext;text-decoration:none">mailto:mpls-bounces@ietf.org</span></a>] On B=
ehalf Of Aissaoui,
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Mu=
stapha<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; (M=
ustapha)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Se=
nt: Tuesday, August 19, 2014 3:19 AM<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; To=
: <a href=3D"mailto:mpls@ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</span><=
/a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Cc=
: <a href=3D"mailto:mpls-chairs@tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls-chairs@tools.iet=
f.org</span></a>;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; <a=
 href=3D"mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">draft-ietf-mpls-ldp-i=
pv6@tools.ietf.org</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Su=
bject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; (s=
hort wglc<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; cl=
osed)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; De=
ar all,<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Th=
e following are the details of the issue we found and the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; pr=
oposed solution. We shared this first with the authors to get initial feedb=
ack.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Wh=
en an LSR which supports LDP IPv6 according to this draft is in
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; a =
LAN with a broadcast interface, it can peer with LSRs which
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; su=
pport this draft and LSRs which do not. When it peers using IPv4
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; LD=
P control plane with an LSR which does not support this draft,
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; we=
 have seen during our testing an issue that the advertisement of
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; IP=
v6 addresses or IPv6 FECs to that peer will cause it to bring
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; do=
wn the IPv4 LDP<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; session.<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; In=
 other words, there are deployed LDP implementations which are
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; co=
mpliant to RFC 5036 for LDP IPv4 but are not compliant to RFC
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; 50=
36 when it comes to handling IPv6 address or IPv6 FECs over an
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; LD=
P IPv4<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; session.<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Th=
is is making us very concerned that when users enable dual-stack
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; LD=
P IPv4/IPv6, they will bring down LDP IPv4 sessions which have
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; be=
en working in a multi-vendor environments for so many years.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Th=
e proposed solution is to have implementations complying to this
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; dr=
aft advertise the IPv6 prefix state advertisement control
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; ca=
pability<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; (d=
raft-ietf-mpls-ldp-ip-pw-capability-07) in the initialization
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; me=
ssage explicitly indicating support for LDP IPv6. Without the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; pe=
er advertising this capability, an LSR must not send IPv6
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; ad=
dresses and FECs to that peer.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Th=
is approach is safer and has been followed when mLDP FEC was
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; in=
troduced as explained in Section 2.1 of RFC 6388. Also, this
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; do=
es not introduce any new TLV to draft-ietf-mpls-ldp-ipv6. It
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; ju=
st makes the exchange of LDP IPv6 addresses and FECs conditional
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; to=
 both peers explicitly indicating support for IPv6 capability
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; du=
ring LDP session<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; initialization.=
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; We=
 do not feel such a simple change justifies writing a new draft
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; an=
d having to deal with backward compatibility of implementations
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; ac=
ross two drafts.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; We=
 appreciate your comments on this matter.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Re=
gards,<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Mu=
stapha.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; -----Original Message-----<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; From: mpls [<a href=3D"mailto:mpls-bounces@ietf.org"><span style=3D"color=
:windowtext;text-decoration:none">mailto:mpls-bounces@ietf.org</span></a>] =
On Behalf Of Loa
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Andersson<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Sent: Tuesday, August 12, 2014 11:45 AM<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; To: <a href=3D"mailto:mpls@ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</span><=
/a>; <a href=3D"mailto:mpls-chairs@tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls-chairs@tools.iet=
f.org</span></a>;
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; <a href=3D"mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">draft-ietf-mpls-ldp-i=
pv6@tools.ietf.org</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Subject: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; wglc<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; closed)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Working Group,<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; During what we thought would be a short wglc on<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; draft-ietf-mpls-ldp-ipv6<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; <a href=3D"http://www.ietf.org/mail-archive/web/mpls/current/msg12464.htm=
l">
<span style=3D"color:windowtext;text-decoration:none">http://www.ietf.org/m=
ail-archive/web/mpls/current/msg12464.html</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; we had a comment that stopped us from continuing progressing the draft.<o=
:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; The short working group last call is now closed!<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; The comment we refer to was raised in a private mail to the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; working group chairs and the draft authors.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; It says that there are a problem with some RFC 5036 non-compliant
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; implementations deployed and draft-ietf-mpls-ldp-ipv6. There is
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; no detailed description of the exact problems.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; We strongly encourage the people that made the comment(s) to
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; write-up the problem, either as<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; - a new draft (preferred); or<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; - in a mail to the working group mailing list<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Once we an agreement to write a new draft or the write-up to the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; mailing, we will continue to ask the working group to see if we
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; can agree to a way to progress. We like to see this write-up
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; before September 1. Failing this we will continue to progress the<o:p></o=
:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; draft-ietf-mpls-ldp-ipv6 as is.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; /Loa<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; for the working group chairs<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; --<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Loa Andersson&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; email:
<a href=3D"mailto:loa@mail01.huawei.com"><span style=3D"color:windowtext;te=
xt-decoration:none">loa@mail01.huawei.com</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Senior MPLS Expert&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
<a href=3D"mailto:loa@pi.nu"><span style=3D"color:windowtext;text-decoratio=
n:none">loa@pi.nu</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Huawei Technologies (consultant)&nbsp;&nbsp;&nbsp;&nbsp; phone: &#43;46 7=
39 81 21 64<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; _______________________________________________<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; mpls mailing list<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; <a href=3D"mailto:mpls@ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</span><=
/a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; <a href=3D"https://www.ietf.org/mailman/listinfo/mpls">
<span style=3D"color:windowtext;text-decoration:none">https://www.ietf.org/=
mailman/listinfo/mpls</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; __=
_____________________________________________<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; mp=
ls mailing list<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; <a=
 href=3D"mailto:mpls@ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</span><=
/a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; <a=
 href=3D"https://www.ietf.org/mailman/listinfo/mpls">
<span style=3D"color:windowtext;text-decoration:none">https://www.ietf.org/=
mailman/listinfo/mpls</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;<o:p></o:p>=
</p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">____________________=
___________________________<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">mpls mailing list<o:=
p></o:p></p>
<p class=3D"MsoPlainText"><a href=3D"mailto:mpls@ietf.org"><span style=3D"c=
olor:windowtext;text-decoration:none">mpls@ietf.org</span></a><o:p></o:p></=
p>
<p class=3D"MsoPlainText"><a href=3D"https://www.ietf.org/mailman/listinfo/=
mpls"><span style=3D"color:windowtext;text-decoration:none">https://www.iet=
f.org/mailman/listinfo/mpls</span></a><o:p></o:p></p>
</div>
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From: "Nobo Akiya (nobo)" <nobo@cisco.com>
To: "Andrew G. Malis" <agmalis@gmail.com>, Loa Andersson <loa@pi.nu>
Thread-Topic: [mpls] :( - Greg and Nobo tells me it is broken -Re: poll to se if we have consensus to make draft-kini-mpls-spring-entropy-label an mpls wg document
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Date: Tue, 11 Nov 2014 21:17:39 +0000
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Subject: Re: [mpls] :( - Greg and Nobo tells me it is broken -Re: poll to se if we have consensus to make draft-kini-mpls-spring-entropy-label an mpls wg document
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From: "Dutta, Pranjal K (Pranjal)" <pranjal.dutta@alcatel-lucent.com>
To: "Aissaoui, Mustapha (Mustapha)" <mustapha.aissaoui@alcatel-lucent.com>, "Rajiv Asati (rajiva)" <rajiva@cisco.com>
Thread-Topic: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc closed)
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Date: Tue, 11 Nov 2014 21:49:35 +0000
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Cc: Ross Callon <rcallon@juniper.net>, "mpls@ietf.org" <mpls@ietf.org>, "mpls-chairs@tools.ietf.org" <mpls-chairs@tools.ietf.org>, "draft-ietf-mpls-ldp-ipv6@tools.ietf.org" <draft-ietf-mpls-ldp-ipv6@tools.ietf.org>
Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc closed)
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--_000_ABD110CD5D879A4BB51C269846E4CA311D16BCSG70YWXCHMBA08zap_
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Yes, adding the explicit advertisement of support of a FEC type in SAC capa=
bility aligns with what we have done for other FEC capabilities so far. Mor=
eover, it is the simplest thing to do as opposed to round-about (+ in corre=
ct) logic proposed by current version of LDP-IPV6 draft for IPV6 capability=
 negotiation.

Thanks,
Pranjal

From: Aissaoui, Mustapha (Mustapha)
Sent: Tuesday, November 11, 2014 1:13 PM
To: Dutta, Pranjal K (Pranjal); Rajiv Asati (rajiva)
Cc: Ross Callon; mpls@ietf.org; mpls-chairs@tools.ietf.org; draft-ietf-mpls=
-ldp-ipv6@tools.ietf.org
Subject: RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc cl=
osed)

I just wanted to add that the explicit advertisement of support of a FEC ty=
pe in the session initialization is already used with mLDP P2MP and MP2MP F=
EC in RFC 6388 (sections 2.1 and 3.1 respectively). It is not new and we ar=
e just saying let us do the same thing for the IPv6 prefix FEC.

Regards,
Mustapha.

From: Dutta, Pranjal K (Pranjal)
Sent: Tuesday, November 11, 2014 3:30 PM
To: Aissaoui, Mustapha (Mustapha); Rajiv Asati (rajiva)
Cc: Ross Callon; mpls@ietf.org<mailto:mpls@ietf.org>; mpls-chairs@tools.iet=
f.org<mailto:mpls-chairs@tools.ietf.org>; draft-ietf-mpls-ldp-ipv6@tools.ie=
tf.org<mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org>
Subject: RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc cl=
osed)

I had raised similar concerns earlier. Hacking up =93per adjacency specific=
=94 Dual-stack TLV to mean for =93session-level=94 IPV6 FEC and Address cap=
abilities is completely wrong thing to do.


1.      Dual stack TLV is sent per Hello adjacency on an interface and its =
purpose is bootstrapping LDP session. There could be multiple interface/adj=
acencies with a peering session. The capability in question is a session le=
vel capability and not per hello adjacency on an interface. Hacking up an a=
djacency level TLV to negotiate  IPV6 session capabilities is a complete di=
sconnect.



2.      LDP session capability framework is defined in RFC 5561. There is a=
n already defined method in draft-ietf-mpls-ldp-ip-pw-capability (SAC Capab=
ilities) which is based on RFC 5561 to negotiate IPV6 FEC Capabilities in a=
n LDP session. Currently SAC Capabilities limit to explicit advertisement o=
f do_not_support =3D -ve case only. Just adding the following clause into S=
AC Capability include the +ve case (explicit support) is a generic way and =
time-tested solution.


=93Implementations complying to this draft must advertise the IPv6 prefix s=
tate advertisement control capability (draft-ietf-mpls-ldp-ip-pw-capability=
) in the initialization message  explicitly indicating support for LDP IPv6=
 FEC. Without the peer advertising this capability, an LSR must not send IP=
v6 addresses and IPv6 FECs to that peer.=94

            It does not make sense for an implementation to hack an adjacen=
cy level TLV (Dual Stack TLV which was introduced for a complete different =
purpose)  for the +ve case and then use IPV6 SAC Capabilities for =96ve cas=
e). There needs to be only one way to fulfill one specific purpose. I am su=
rprised too to see such kind of proposals in a Standards track item which i=
s likely to exist for many years.

Thanks,
Pranjal

From: Aissaoui, Mustapha (Mustapha)
Sent: Monday, November 10, 2014 3:00 PM
To: Rajiv Asati (rajiva); Dutta, Pranjal K (Pranjal)
Cc: Ross Callon; mpls@ietf.org<mailto:mpls@ietf.org>; mpls-chairs@tools.iet=
f.org<mailto:mpls-chairs@tools.ietf.org>; draft-ietf-mpls-ldp-ipv6@tools.ie=
tf.org<mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org>
Subject: RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc cl=
osed)

Hi Rajiv,
We did not properly close this discussion and I noticed the draft was updat=
ed to use the dual-stack capability TLV in Hellos as a way to discover the =
LDP peer capability of handling IPv6 FECs and IPv6 addresses.

I am very surprised that we are deviating from the main LDP mechanism which=
 is the LDP capability as per RFC 5561. Furthermore, we only needed to disc=
over the IPv6 FEC and IPv6 address capabilities at the session level and no=
t at the Hello adjacency level. There is nothing which is specific to the a=
djacency here.

The dual-stack capability TLV has nothing to do with the FEC and address ca=
pability of an LSR, it is simply a way to handle preference for the control=
 plane establishment of the Hello adjacency. It is not a good precedent tha=
t this would be overloaded to indicate FEC and address capability advertise=
ment which is orthogonal to adjacency establishment.

I strongly believe that we simply needed to use the existing IPv6 capabilit=
y described in draft-ietf-mpls-ldp-ip-pw-capability,  which is extension of=
 LDP capabilities defined in RFC 5561. We could also define another capabil=
ity for the IPv6 addresses in that same draft if really required but I do n=
ot think we needed to. There needs to be only one method to do one thing an=
d draft-ietf-mpls-ldp-ip-pw-capability is the way to go  for any IPv6 FEC r=
elated =93session=94 capabilities.

To re-iterate, here is the proposal I made. Implementations complying to th=
is draft must advertise the IPv6 prefix state advertisement control capabil=
ity (draft-ietf-mpls-ldp-ip-pw-capability) in the initialization message ex=
plicitly indicating support for LDP IPv6 FEC. Without the peer advertising =
this capability, an LSR must not send IPv6 addresses and IPv6 FECs to that =
peer.

There was one individual support for this proposal on this mailing list and=
 I thus consider the discussion was not properly closed.

Regards,
Mustapha.

From: Dutta, Pranjal K (Pranjal)
Sent: Tuesday, September 02, 2014 5:33 PM
To: Aissaoui, Mustapha (Mustapha); Rajiv Asati (rajiva)
Cc: Ross Callon; mpls@ietf.org<mailto:mpls@ietf.org>; mpls-chairs@tools.iet=
f.org<mailto:mpls-chairs@tools.ietf.org>; draft-ietf-mpls-ldp-ipv6@tools.ie=
tf.org<mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org>
Subject: RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc cl=
osed)


I second to Mustapha. We should use features for what they are designed for=
. It is the SAC capability (draft-ietf-mpls-ldp-ip-pw-capability-07) that d=
efines the negotiation of IPV4/IPV6 Prefix FEC Capabilities in LDP session,=
 which fits into the required inter-op solution organically.



I do not consider explicit advertisement of IPv6 Prefix FEC SAC (D =3D 0) i=
n Initialization message can be seen as baggage. An implementation that doe=
s not want to receive IPv6 Prefix FECs will send D=3D1 in Initialization me=
ssage anyways.



Cheers,

Pranjal



-----Original Message-----
From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Aissaoui, Mustapha (=
Mustapha)
Sent: Tuesday, September 02, 2014 11:57 AM
To: Rajiv Asati (rajiva)
Cc: Ross Callon; mpls@ietf.org<mailto:mpls@ietf.org>; mpls-chairs@tools.iet=
f.org<mailto:mpls-chairs@tools.ietf.org>; draft-ietf-mpls-ldp-ipv6@tools.ie=
tf.org<mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org>
Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc cl=
osed)



Hi Rajiv,

I think the key point I am trying to convey is that we should keep the prot=
ocol clean and use features for what they are designed for. LDP has its own=
 capability advertisement and it is meant to address issues like this one.



Overloading the TR field of the initialization message means that a peer wi=
ll have to check both the TR and the SAC to decide what to do for the IPv6 =
prefix FEC while it is sufficient to check the SAC for all other FEC types.=
 This is inconsistent and will cause an unnecessary exception in the protoc=
ol.



Also, using the LDP advertisement capability is not a baggage in the future=
. This mechanism is used with mLDP P2P and MP2MP FECs and this is working f=
ine today although many implementations now support these types of FECs.



As for changing other drafts, we are simply talking about stating in draft-=
ietf-mpls-ldp-ip-pw-capability-07 that an LDP peer must set D-bit=3D0  in I=
Pv6 prefix FEC SAC in the initialization message.



Regards,

Mustapha.



> -----Original Message-----

> From: Rajiv Asati (rajiva) [mailto:rajiva@cisco.com]

> Sent: Saturday, August 30, 2014 7:19 AM

> To: Aissaoui, Mustapha (Mustapha)

> Cc: Ross Callon; mpls@ietf.org<mailto:mpls@ietf.org>; mpls-chairs@tools.i=
etf.org<mailto:mpls-chairs@tools.ietf.org>;

> draft-ietf-mpls-ldp- ipv6@tools.ietf.org<mailto:ipv6@tools.ietf.org>

> Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short

> wglc closed)

>

> Hi Mustapha,

>

> TR field is useful in case of dual-stack environment and using it for

> determining whether the peer implementation is compliant (wrt handling

> v6 address bindings and label bindings) is simple and straight forward.

>

> When v6-only peer implementations exist (and become a new norm), TR

> field usage would become moot. And we wouldn't have to see them. A

> very good thing, IMO.

>

> We need to think about how much of this baggage needs to carry over

> when single- stack ipv6 networks become a new norm (like single-stack ipv=
4 has been).

>

> Given that this draft already has built-in means to accommodate the

> RFC5036 non- compliant peer issue and do so in a simple manner, it is

> not necessary to require changing other drafts, IMO.

>

>

> Cheers,

> Raj

>

>

> PS; While there are multiple types of FECs, and it would be wise to

> dictate the default behavior (v6 FECs advertised) in v6-only

> environment with an option to change it. This is nothing different from c=
urrent protocol machinery.

>

>

> > On Aug 29, 2014, at 8:25 PM, "Aissaoui, Mustapha (Mustapha)"

> <mustapha.aissaoui@alcatel-lucent .com<mailto:mustapha.aissaoui@alcatel-l=
ucent%20.com>> wrote:

> >

> > Hi Rajiv,

> > See inline below for some follow-up.

> >

> > Regards,

> > Mustapha.

> >

> >> -----Original Message-----

> >> From: Rajiv Asati (rajiva) [mailto:rajiva@cisco.com]

> >> Sent: Wednesday, August 27, 2014 7:19 PM

> >> To: Ross Callon; Aissaoui, Mustapha (Mustapha); mpls@ietf.org<mailto:m=
pls@ietf.org>

> >> Cc: mpls-chairs@tools.ietf.org<mailto:mpls-chairs@tools.ietf.org>;

> >> draft-ietf-mpls-ldp-ipv6@tools.ietf.org<mailto:draft-ietf-mpls-ldp-ipv=
6@tools.ietf.org>

> >> Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short

> >> wglc closed)

> >>

> >>

> >> If this draft were to address the interoperability with rfc5036

> >> non-compliant implementations, then it would be easier to rather

> >> leverage the =8Ctransport preference=B9 TLV that is already part of th=
e version 13.

> >> This TLV was defined after the getting Adrian's and George=B9s feedbac=
k.

> >>

> >> http://tools.ietf.org/html/draft-ietf-mpls-ldp-ipv6-13#section-6.1.

> >> 1

> > MA> It is not a good idea to overload this new TLV with a capability

> > MA> advertisement

> role. LDP has its own capability advertisement mechanism and there is

> no need to confuse implementations with the handling of two mechanisms.

> >

> >> The reason for not agreeing to the alternate solution (of using IP

> >> Prefix capability

> >> etc.) is 2-fold:

> >>

> >> - not forward compatible (consider a deployment 5 yrs from now -

> >> IPv6-only MPLS network - now, the LSR will be expecting an

> >> unnecessary IPv6 prefix capability advertisement, and that=B9s not

> >> optimal, if not annoying)

> > MA> IPv6-only network is not synonymous with a single FEC type

> > MA> network. It will

> support many types of FECs  in addition to the IPv6 prefix FEC: mLDP

> IPv6 FECs, PW FECs, IPv4 prefix FEC, etc. The LDP capabilities have

> been designed for the purpose of explicitly enabling or disabling

> capabilities including FEC type support on a given session.

> >

> >> - not 100% backward compatible (does not solve the advertisement of

> >> v6 address binding to a v4 neighbor (which can also cause an outage

> >> to a non-compliant peer))

> > MA> I think it makes sense to tie the exchange of both IPv6 address

> > MA> messages

> and IPv6 prefix FECs to the advertisement of the IPv6 capability by

> both peers. If however there is a use case for decoupling the

> advertising of IPv6 addresses from

> IPv6 FECs, then a separate capability can be devised for addresses but

> I do not think we need it.

> >

> >

> >> Thanks.

> >>

> >>

> >> --

> >> Cheers,

> >> Rajiv Asati

> >> Distinguished Engineer, Cisco

> >>

> >>

> >>

> >>

> >>

> >> -----Original Message-----

> >> From: Ross Callon <rcallon@juniper.net<mailto:rcallon@juniper.net>>

> >> Date: Friday, August 22, 2014 at 4:34 PM

> >> To: Mustapha Aissaoui <mustapha.aissaoui@alcatel-lucent.com<mailto:mus=
tapha.aissaoui@alcatel-lucent.com>>,

> >> "mpls@ietf.org<mailto:mpls@ietf.org>" <mpls@ietf.org<mailto:mpls@ietf.=
org>>

> >> Cc: "mpls-chairs@tools.ietf.org<mailto:mpls-chairs@tools.ietf.org>" <m=
pls-chairs@tools.ietf.org<mailto:mpls-chairs@tools.ietf.org>>,

> >> "draft-ietf-mpls-ldp-ipv6@tools.ietf.org<mailto:draft-ietf-mpls-ldp-ip=
v6@tools.ietf.org>"

> >> <draft-ietf-mpls-ldp-ipv6@tools.ietf.org<mailto:draft-ietf-mpls-ldp-ip=
v6@tools.ietf.org>>

> >> Subject: RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short

> >> wglc

> >> closed)

> >> Resent-From: <draft-alias-bounces@tools.ietf.org<mailto:draft-alias-bo=
unces@tools.ietf.org>>

> >> Resent-To: Carlos Pignataro <cpignata@cisco.com<mailto:cpignata@cisco.=
com>>, Rajiv Papneja

> >> <rajiv.papneja@huawei.com<mailto:rajiv.papneja@huawei.com>>, Rajiv Asa=
ti <rajiva@cisco.com<mailto:rajiva@cisco.com>>, Vishwas

> >> Manral <vishwas.manral@hp.com<mailto:vishwas.manral@hp.com>>, <swallow=
@cisco.com<mailto:swallow@cisco.com>>, Loa Andersson

> >> <loa@pi.nu<mailto:loa@pi.nu>>, Ross Callon <rcallon@juniper.net<mailto=
:rcallon@juniper.net>>, MARTIN VIGOUREUX

> >> <martin.vigoureux@alcatel-lucent.com<mailto:martin.vigoureux@alcatel-l=
ucent.com>>

> >> Resent-Date: Friday, August 22, 2014 at 4:35 PM

> >>

> >>>> The proposed solution is to have implementations complying to

> >>>> this draft advertise the IPv6 prefix state advertisement control

> >>>> capability

> >>>> (draft-ietf-mpls-ldp-ip-pw-capability-07) in the initialization

> >>>> message explicitly indicating support for LDP IPv6. Without the

> >>>> peer advertising this capability, an LSR must not send IPv6

> >>>> addresses and FECs to that peer.

> >>>

> >>> Speaking as an individual contributor, this seems IMHO to be the

> >>> right solution (noting that, in final text as would be published

> >>> in an RFC, the "must not" in the last sentence should be capitalized)=
.

> >>>

> >>> Thanks, Ross

> >>>

> >>> -----Original Message-----

> >>> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Aissaoui,

> >>> Mustapha

> >>> (Mustapha)

> >>> Sent: Tuesday, August 19, 2014 3:19 AM

> >>> To: mpls@ietf.org<mailto:mpls@ietf.org>

> >>> Cc: mpls-chairs@tools.ietf.org<mailto:mpls-chairs@tools.ietf.org>;

> >>> draft-ietf-mpls-ldp-ipv6@tools.ietf.org<mailto:draft-ietf-mpls-ldp-ip=
v6@tools.ietf.org>

> >>> Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6

> >>> (short wglc

> >>> closed)

> >>>

> >>> Dear all,

> >>> The following are the details of the issue we found and the

> >>> proposed solution. We shared this first with the authors to get initi=
al feedback.

> >>>

> >>> When an LSR which supports LDP IPv6 according to this draft is in

> >>> a LAN with a broadcast interface, it can peer with LSRs which

> >>> support this draft and LSRs which do not. When it peers using IPv4

> >>> LDP control plane with an LSR which does not support this draft,

> >>> we have seen during our testing an issue that the advertisement of

> >>> IPv6 addresses or IPv6 FECs to that peer will cause it to bring

> >>> down the IPv4 LDP

> session.

> >>>

> >>> In other words, there are deployed LDP implementations which are

> >>> compliant to RFC 5036 for LDP IPv4 but are not compliant to RFC

> >>> 5036 when it comes to handling IPv6 address or IPv6 FECs over an

> >>> LDP IPv4

> session.

> >>> This is making us very concerned that when users enable dual-stack

> >>> LDP IPv4/IPv6, they will bring down LDP IPv4 sessions which have

> >>> been working in a multi-vendor environments for so many years.

> >>>

> >>> The proposed solution is to have implementations complying to this

> >>> draft advertise the IPv6 prefix state advertisement control

> >>> capability

> >>> (draft-ietf-mpls-ldp-ip-pw-capability-07) in the initialization

> >>> message explicitly indicating support for LDP IPv6. Without the

> >>> peer advertising this capability, an LSR must not send IPv6

> >>> addresses and FECs to that peer.

> >>>

> >>> This approach is safer and has been followed when mLDP FEC was

> >>> introduced as explained in Section 2.1 of RFC 6388. Also, this

> >>> does not introduce any new TLV to draft-ietf-mpls-ldp-ipv6. It

> >>> just makes the exchange of LDP IPv6 addresses and FECs conditional

> >>> to both peers explicitly indicating support for IPv6 capability

> >>> during LDP session

> initialization.

> >>>

> >>> We do not feel such a simple change justifies writing a new draft

> >>> and having to deal with backward compatibility of implementations

> >>> across two drafts.

> >>>

> >>> We appreciate your comments on this matter.

> >>>

> >>> Regards,

> >>> Mustapha.

> >>>

> >>>

> >>>> -----Original Message-----

> >>>> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa

> >>>> Andersson

> >>>> Sent: Tuesday, August 12, 2014 11:45 AM

> >>>> To: mpls@ietf.org<mailto:mpls@ietf.org>; mpls-chairs@tools.ietf.org<=
mailto:mpls-chairs@tools.ietf.org>;

> >>>> draft-ietf-mpls-ldp-ipv6@tools.ietf.org<mailto:draft-ietf-mpls-ldp-i=
pv6@tools.ietf.org>

> >>>> Subject: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short

> >>>> wglc

> >>>> closed)

> >>>>

> >>>> Working Group,

> >>>>

> >>>> During what we thought would be a short wglc on

> >>>> draft-ietf-mpls-ldp-ipv6

> >>>> http://www.ietf.org/mail-archive/web/mpls/current/msg12464.html

> >>>> we had a comment that stopped us from continuing progressing the dra=
ft.

> >>>>

> >>>> The short working group last call is now closed!

> >>>>

> >>>> The comment we refer to was raised in a private mail to the

> >>>> working group chairs and the draft authors.

> >>>>

> >>>> It says that there are a problem with some RFC 5036 non-compliant

> >>>> implementations deployed and draft-ietf-mpls-ldp-ipv6. There is

> >>>> no detailed description of the exact problems.

> >>>>

> >>>> We strongly encourage the people that made the comment(s) to

> >>>> write-up the problem, either as

> >>>>

> >>>> - a new draft (preferred); or

> >>>> - in a mail to the working group mailing list

> >>>>

> >>>> Once we an agreement to write a new draft or the write-up to the

> >>>> mailing, we will continue to ask the working group to see if we

> >>>> can agree to a way to progress. We like to see this write-up

> >>>> before September 1. Failing this we will continue to progress the

> >>>> draft-ietf-mpls-ldp-ipv6 as is.

> >>>>

> >>>> /Loa

> >>>> for the working group chairs

> >>>> --

> >>>>

> >>>>

> >>>> Loa Andersson                        email: loa@mail01.huawei.com<ma=
ilto:loa@mail01.huawei.com>

> >>>> Senior MPLS Expert                          loa@pi.nu<mailto:loa@pi.=
nu>

> >>>> Huawei Technologies (consultant)     phone: +46 739 81 21 64

> >>>>

> >>>> _______________________________________________

> >>>> mpls mailing list

> >>>> mpls@ietf.org<mailto:mpls@ietf.org>

> >>>> https://www.ietf.org/mailman/listinfo/mpls

> >>>

> >>> _______________________________________________

> >>> mpls mailing list

> >>> mpls@ietf.org<mailto:mpls@ietf.org>

> >>> https://www.ietf.org/mailman/listinfo/mpls

> >



_______________________________________________

mpls mailing list

mpls@ietf.org<mailto:mpls@ietf.org>

https://www.ietf.org/mailman/listinfo/mpls

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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Times New Roman&quo=
t;,&quot;serif&quot;;color:#1F497D">Yes, adding the explicit advertisement =
of support of a FEC type in SAC capability aligns with what we have done fo=
r other FEC capabilities so far. Moreover, it is the simplest
 thing to do as opposed to round-about (&#43; in correct) logic proposed by=
 current version of LDP-IPV6 draft for IPV6 capability negotiation.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Times New Roman&quo=
t;,&quot;serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Times New Roman&quo=
t;,&quot;serif&quot;;color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Times New Roman&quo=
t;,&quot;serif&quot;;color:#1F497D">Pranjal<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> Aissaoui=
, Mustapha (Mustapha)
<br>
<b>Sent:</b> Tuesday, November 11, 2014 1:13 PM<br>
<b>To:</b> Dutta, Pranjal K (Pranjal); Rajiv Asati (rajiva)<br>
<b>Cc:</b> Ross Callon; mpls@ietf.org; mpls-chairs@tools.ietf.org; draft-ie=
tf-mpls-ldp-ipv6@tools.ietf.org<br>
<b>Subject:</b> RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short =
wglc closed)<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">I just wanted to add that the explicit advertisement of su=
pport of a FEC type in the session initialization is already used with mLDP=
 P2MP and MP2MP FEC in RFC 6388 (sections 2.1 and 3.1 respectively).
 It is not new and we are just saying let us do the same thing for the IPv6=
 prefix FEC.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">Mustapha.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> Dutta, P=
ranjal K (Pranjal)
<br>
<b>Sent:</b> Tuesday, November 11, 2014 3:30 PM<br>
<b>To:</b> Aissaoui, Mustapha (Mustapha); Rajiv Asati (rajiva)<br>
<b>Cc:</b> Ross Callon; <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>;=
 <a href=3D"mailto:mpls-chairs@tools.ietf.org">
mpls-chairs@tools.ietf.org</a>; <a href=3D"mailto:draft-ietf-mpls-ldp-ipv6@=
tools.ietf.org">
draft-ietf-mpls-ldp-ipv6@tools.ietf.org</a><br>
<b>Subject:</b> RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short =
wglc closed)<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Times New Roman&quo=
t;,&quot;serif&quot;;color:#1F497D">I had raised similar concerns earlier. =
Hacking up =93per adjacency specific=94 Dual-stack TLV to mean for =93sessi=
on-level=94 IPV6 FEC and Address capabilities is completely wrong
 thing to do.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Times New Roman&quo=
t;,&quot;serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"font-family:&quot;Times New Rom=
an&quot;,&quot;serif&quot;;color:#1F497D"><span style=3D"mso-list:Ignore">1=
.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"font-family:&quot;Times New R=
oman&quot;,&quot;serif&quot;;color:#1F497D">Dual stack TLV is sent per Hell=
o adjacency on an interface and its purpose is bootstrapping LDP session. T=
here could be multiple interface/adjacencies with a peering
 session. The capability in question is a session level capability and not =
per hello adjacency on an interface. Hacking up an adjacency level TLV to n=
egotiate&nbsp; IPV6 session capabilities is a complete disconnect.<o:p></o:=
p></span></p>
<p class=3D"MsoListParagraph"><span style=3D"font-family:&quot;Times New Ro=
man&quot;,&quot;serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"font-family:&quot;Times New Rom=
an&quot;,&quot;serif&quot;;color:#1F497D"><span style=3D"mso-list:Ignore">2=
.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"font-family:&quot;Times New R=
oman&quot;,&quot;serif&quot;;color:#1F497D">LDP session capability framewor=
k is defined in RFC 5561. There is an already defined method in draft-ietf-=
mpls-ldp-ip-pw-capability (SAC Capabilities) which is
 based on RFC 5561 to negotiate IPV6 FEC Capabilities in an LDP session. Cu=
rrently SAC Capabilities limit to explicit advertisement of do_not_support =
=3D -ve case only. Just adding the following clause into SAC Capability inc=
lude the &#43;ve case (explicit support)
 is a generic way and time-tested solution.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span style=3D"font-family:&quot;Times New Ro=
man&quot;,&quot;serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-famil=
y:&quot;Arial&quot;,&quot;sans-serif&quot;">=93Implementations complying to=
 this draft must advertise the IPv6 prefix state advertisement control capa=
bility (draft-ietf-mpls-ldp-ip-pw-capability) in the initialization
 message &nbsp;explicitly indicating support for LDP IPv6 FEC. Without the =
peer advertising this capability, an LSR must not send IPv6 addresses and I=
Pv6 FECs to that peer.=94<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Times New Roman&quo=
t;,&quot;serif&quot;;color:#1F497D">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp; It does not make sense for an implementation to=
 hack an adjacency level TLV (Dual Stack TLV which was introduced for a com=
plete different purpose) &nbsp;for the &#43;ve
 case and then use IPV6 SAC Capabilities for =96ve case). There needs to be=
 only one way to fulfill one specific purpose. I am surprised too to see su=
ch kind of proposals in a Standards track item which is likely to exist for=
 many years.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Times New Roman&quo=
t;,&quot;serif&quot;;color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Times New Roman&quo=
t;,&quot;serif&quot;;color:#1F497D">Pranjal<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> Aissaoui=
, Mustapha (Mustapha)
<br>
<b>Sent:</b> Monday, November 10, 2014 3:00 PM<br>
<b>To:</b> Rajiv Asati (rajiva); Dutta, Pranjal K (Pranjal)<br>
<b>Cc:</b> Ross Callon; <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>;=
 <a href=3D"mailto:mpls-chairs@tools.ietf.org">
mpls-chairs@tools.ietf.org</a>; <a href=3D"mailto:draft-ietf-mpls-ldp-ipv6@=
tools.ietf.org">
draft-ietf-mpls-ldp-ipv6@tools.ietf.org</a><br>
<b>Subject:</b> RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short =
wglc closed)<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">Hi Rajiv,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">We did not properly close this discussion and I noticed th=
e draft was updated to use the dual-stack capability TLV in Hellos as a way=
 to discover the LDP peer capability of handling IPv6 FECs
 and IPv6 addresses. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">I am very surprised that we are deviating from the main LD=
P mechanism which is the LDP capability as per RFC 5561. Furthermore, we on=
ly needed to discover the IPv6 FEC and IPv6 address capabilities
 at the session level and not at the Hello adjacency level. There is nothin=
g which is specific to the adjacency here.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">The dual-stack capability TLV has nothing to do with the F=
EC and address capability of an LSR, it is simply a way to handle preferenc=
e for the control plane establishment of the Hello adjacency.
 It is not a good precedent that this would be overloaded to indicate FEC a=
nd address capability advertisement which is orthogonal to adjacency establ=
ishment.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">I strongly believe that we simply needed to use the existi=
ng IPv6 capability described in draft-ietf-mpls-ldp-ip-pw-capability,&nbsp;=
 which is extension of LDP capabilities defined in RFC 5561.
 We could also define another capability for the IPv6 addresses in that sam=
e draft if really required but I do not think we needed to. There needs to =
be only one method to do one thing and draft-ietf-mpls-ldp-ip-pw-capability=
 is the way to go&nbsp; for any IPv6
 FEC related =93session=94 capabilities.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">To re-iterate, here is the proposal I made. Implementation=
s complying to this draft must advertise the IPv6 prefix state advertisemen=
t control capability (draft-ietf-mpls-ldp-ip-pw-capability)
 in the initialization message explicitly indicating support for LDP IPv6 F=
EC. Without the peer advertising this capability, an LSR must not send IPv6=
 addresses and IPv6 FECs to that peer.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">There was one individual support for this proposal on this=
 mailing list and I thus consider the discussion was not properly closed.<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;">Mustapha.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> Dutta, P=
ranjal K (Pranjal)
<br>
<b>Sent:</b> Tuesday, September 02, 2014 5:33 PM<br>
<b>To:</b> Aissaoui, Mustapha (Mustapha); Rajiv Asati (rajiva)<br>
<b>Cc:</b> Ross Callon; <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>;=
 <a href=3D"mailto:mpls-chairs@tools.ietf.org">
mpls-chairs@tools.ietf.org</a>; <a href=3D"mailto:draft-ietf-mpls-ldp-ipv6@=
tools.ietf.org">
draft-ietf-mpls-ldp-ipv6@tools.ietf.org</a><br>
<b>Subject:</b> RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short =
wglc closed)<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:12.0pt;font-family:&quot=
;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D">I second to Mustaph=
a. We should use features for what they are designed for. It is the SAC cap=
ability (draft-ietf-mpls-ldp-ip-pw-capability-07) that defines
 the negotiation of IPV4/IPV6 Prefix FEC Capabilities in LDP session, which=
 fits into the required inter-op solution organically.<o:p></o:p></span></p=
>
<p class=3D"MsoPlainText"><span style=3D"font-size:12.0pt;font-family:&quot=
;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:12.0pt;font-family:&quot=
;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D">I do not consider e=
xplicit advertisement of IPv6 Prefix FEC SAC (D =3D 0) in Initialization me=
ssage can be seen as baggage. An implementation that does
 not want to receive IPv6 Prefix FECs will send D=3D1 in Initialization mes=
sage anyways.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:12.0pt;font-family:&quot=
;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D">Cheers,<o:p></o:p><=
/span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:12.0pt;font-family:&quot=
;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D">Pranjal<o:p></o:p><=
/span></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">-----Original Message-----<br>
From: mpls [<a href=3D"mailto:mpls-bounces@ietf.org">mailto:mpls-bounces@ie=
tf.org</a>] On Behalf Of Aissaoui, Mustapha (Mustapha)<br>
Sent: Tuesday, September 02, 2014 11:57 AM<br>
To: Rajiv Asati (rajiva)<br>
Cc: Ross Callon; <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>; <a hre=
f=3D"mailto:mpls-chairs@tools.ietf.org">
mpls-chairs@tools.ietf.org</a>; <a href=3D"mailto:draft-ietf-mpls-ldp-ipv6@=
tools.ietf.org">
draft-ietf-mpls-ldp-ipv6@tools.ietf.org</a><br>
Subject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short wglc cl=
osed)<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Hi Rajiv,<o:p></o:p></p>
<p class=3D"MsoPlainText">I think the key point I am trying to convey is th=
at we should keep the protocol clean and use features for what they are des=
igned for. LDP has its own capability advertisement and it is meant to addr=
ess issues like this one.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Overloading the TR field of the initialization me=
ssage means that a peer will have to check both the TR and the SAC to decid=
e what to do for the IPv6 prefix FEC while it is sufficient to check the SA=
C for all other FEC types. This is
 inconsistent and will cause an unnecessary exception in the protocol.<o:p>=
</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Also, using the LDP advertisement capability is n=
ot a baggage in the future. This mechanism is used with mLDP P2P and MP2MP =
FECs and this is working fine today although many implementations now suppo=
rt these types of FECs.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">As for changing other drafts, we are simply talki=
ng about stating in draft-ietf-mpls-ldp-ip-pw-capability-07 that an LDP pee=
r must set D-bit=3D0&nbsp; in IPv6 prefix FEC SAC in the initialization mes=
sage.
<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Regards,<o:p></o:p></p>
<p class=3D"MsoPlainText">Mustapha.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&gt; -----Original Message-----<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; From: Rajiv Asati (rajiva) [<a href=3D"mailt=
o:rajiva@cisco.com"><span style=3D"color:windowtext;text-decoration:none">m=
ailto:rajiva@cisco.com</span></a>]<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Sent: Saturday, August 30, 2014 7:19 AM<o:p>=
</o:p></p>
<p class=3D"MsoPlainText">&gt; To: Aissaoui, Mustapha (Mustapha)<o:p></o:p>=
</p>
<p class=3D"MsoPlainText">&gt; Cc: Ross Callon; <a href=3D"mailto:mpls@ietf=
.org"><span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</=
span></a>;
<a href=3D"mailto:mpls-chairs@tools.ietf.org"><span style=3D"color:windowte=
xt;text-decoration:none">mpls-chairs@tools.ietf.org</span></a>;
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; draft-ietf-mpls-ldp- <a href=3D"mailto:ipv6@=
tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">ipv6@tools.ietf.org</=
span></a><o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Subject: Re: [mpls] Way to progress draft-ie=
tf-mpls-ldp-ipv6 (short
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; wglc closed)<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Hi Mustapha,<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; TR field is useful in case of dual-stack env=
ironment and using it for
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; determining whether the peer implementation =
is compliant (wrt handling
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; v6 address bindings and label bindings) is s=
imple and straight forward.<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; When v6-only peer implementations exist (and=
 become a new norm), TR
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; field usage would become moot. And we wouldn=
't have to see them. A
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; very good thing, IMO.<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; We need to think about how much of this bagg=
age needs to carry over
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; when single- stack ipv6 networks become a ne=
w norm (like single-stack ipv4 has been).<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Given that this draft already has built-in m=
eans to accommodate the
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; RFC5036 non- compliant peer issue and do so =
in a simple manner, it is
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; not necessary to require changing other draf=
ts, IMO.<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Cheers,<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; Raj<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; PS; While there are multiple types of FECs, =
and it would be wise to
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; dictate the default behavior (v6 FECs advert=
ised) in v6-only
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; environment with an option to change it. Thi=
s is nothing different from current protocol machinery.<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; <o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt; On Aug 29, 2014, at 8:25 PM, &quot;Aiss=
aoui, Mustapha (Mustapha)&quot;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &lt;<a href=3D"mailto:mustapha.aissaoui@alca=
tel-lucent%20.com"><span style=3D"color:windowtext;text-decoration:none">mu=
stapha.aissaoui@alcatel-lucent .com</span></a>&gt; wrote:<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt; Hi Rajiv,<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt; See inline below for some follow-up.<o:=
p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt; Regards,<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt; Mustapha.<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; -----Original Message-----<o:p></o:=
p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; From: Rajiv Asati (rajiva) [<a href=
=3D"mailto:rajiva@cisco.com"><span style=3D"color:windowtext;text-decoratio=
n:none">mailto:rajiva@cisco.com</span></a>]<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; Sent: Wednesday, August 27, 2014 7:=
19 PM<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; To: Ross Callon; Aissaoui, Mustapha=
 (Mustapha); <a href=3D"mailto:mpls@ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</span><=
/a><o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; Cc: <a href=3D"mailto:mpls-chairs@t=
ools.ietf.org"><span style=3D"color:windowtext;text-decoration:none">mpls-c=
hairs@tools.ietf.org</span></a>;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; <a href=3D"mailto:draft-ietf-mpls-l=
dp-ipv6@tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">draft-ietf-mpls-ldp-i=
pv6@tools.ietf.org</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; Subject: Re: [mpls] Way to progress=
 draft-ietf-mpls-ldp-ipv6 (short
<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; wglc closed)<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt; &gt;&gt; If this draft were to address the i=
nteroperability with rfc5036
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; non-co=
mpliant implementations, then it would be easier to rather
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; levera=
ge the =8Ctransport preference=B9 TLV that is already part of the version 1=
3.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; This T=
LV was defined after the getting Adrian's and George=B9s feedback.<o:p></o:=
p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; <a hre=
f=3D"http://tools.ietf.org/html/draft-ietf-mpls-ldp-ipv6-13#section-6.1">
<span style=3D"color:windowtext;text-decoration:none">http://tools.ietf.org=
/html/draft-ietf-mpls-ldp-ipv6-13#section-6.1</span></a>.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; 1<o:p>=
</o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; It =
is not a good idea to overload this new TLV with a capability
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; adv=
ertisement<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; role. LDP has i=
ts own capability advertisement mechanism and there is
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; no need to conf=
use implementations with the handling of two mechanisms.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;<o:p></o:p>=
</p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; The re=
ason for not agreeing to the alternate solution (of using IP
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Prefix=
 capability<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; etc.) =
is 2-fold:<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; - not =
forward compatible (consider a deployment 5 yrs from now -
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; IPv6-o=
nly MPLS network - now, the LSR will be expecting an
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; unnece=
ssary IPv6 prefix capability advertisement, and that=B9s not
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; optima=
l, if not annoying)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; IPv=
6-only network is not synonymous with a single FEC type
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; net=
work. It will<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; support many ty=
pes of FECs&nbsp; in addition to the IPv6 prefix FEC: mLDP
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt"><span lang=3D"FR-CA"=
>&gt; IPv6 FECs, PW FECs, IPv4 prefix FEC, etc.
</span>The LDP capabilities have <o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; been designed f=
or the purpose of explicitly enabling or disabling
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; capabilities in=
cluding FEC type support on a given session.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;<o:p></o:p>=
</p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; - not =
100% backward compatible (does not solve the advertisement of<o:p></o:p></p=
>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; v6 add=
ress binding to a v4 neighbor (which can also cause an outage
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; to a n=
on-compliant peer))<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; I t=
hink it makes sense to tie the exchange of both IPv6 address
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt; MA&gt; mes=
sages<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; and IPv6 prefix=
 FECs to the advertisement of the IPv6 capability by
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; both peers. If =
however there is a use case for decoupling the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; advertising of =
IPv6 addresses from<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; IPv6 FECs, then=
 a separate capability can be devised for addresses but
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; I do not think =
we need it.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;<o:p></o:p>=
</p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;<o:p></o:p>=
</p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Thanks=
.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; --<o:p=
></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Cheers=
,<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Rajiv =
Asati<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Distin=
guished Engineer, Cisco<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; -----O=
riginal Message-----<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; From: =
Ross Callon &lt;<a href=3D"mailto:rcallon@juniper.net"><span style=3D"color=
:windowtext;text-decoration:none">rcallon@juniper.net</span></a>&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Date: =
Friday, August 22, 2014 at 4:34 PM<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; To: Mu=
stapha Aissaoui &lt;<a href=3D"mailto:mustapha.aissaoui@alcatel-lucent.com"=
><span style=3D"color:windowtext;text-decoration:none">mustapha.aissaoui@al=
catel-lucent.com</span></a>&gt;,<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; &quot;=
<a href=3D"mailto:mpls@ietf.org"><span style=3D"color:windowtext;text-decor=
ation:none">mpls@ietf.org</span></a>&quot; &lt;<a href=3D"mailto:mpls@ietf.=
org"><span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</s=
pan></a>&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Cc: &q=
uot;<a href=3D"mailto:mpls-chairs@tools.ietf.org"><span style=3D"color:wind=
owtext;text-decoration:none">mpls-chairs@tools.ietf.org</span></a>&quot; &l=
t;<a href=3D"mailto:mpls-chairs@tools.ietf.org"><span style=3D"color:window=
text;text-decoration:none">mpls-chairs@tools.ietf.org</span></a>&gt;,
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; &quot;=
<a href=3D"mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org"><span style=3D"c=
olor:windowtext;text-decoration:none">draft-ietf-mpls-ldp-ipv6@tools.ietf.o=
rg</span></a>&quot;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; &lt;<a=
 href=3D"mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org"><span style=3D"col=
or:windowtext;text-decoration:none">draft-ietf-mpls-ldp-ipv6@tools.ietf.org=
</span></a>&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Subjec=
t: RE: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; wglc<o=
:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; closed=
)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Resent=
-From: &lt;<a href=3D"mailto:draft-alias-bounces@tools.ietf.org"><span styl=
e=3D"color:windowtext;text-decoration:none">draft-alias-bounces@tools.ietf.=
org</span></a>&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Resent=
-To: Carlos Pignataro &lt;<a href=3D"mailto:cpignata@cisco.com"><span style=
=3D"color:windowtext;text-decoration:none">cpignata@cisco.com</span></a>&gt=
;, Rajiv Papneja
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; &lt;<a=
 href=3D"mailto:rajiv.papneja@huawei.com"><span style=3D"color:windowtext;t=
ext-decoration:none">rajiv.papneja@huawei.com</span></a>&gt;, Rajiv Asati &=
lt;<a href=3D"mailto:rajiva@cisco.com"><span style=3D"color:windowtext;text=
-decoration:none">rajiva@cisco.com</span></a>&gt;,
 Vishwas <o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Manral=
 &lt;<a href=3D"mailto:vishwas.manral@hp.com"><span style=3D"color:windowte=
xt;text-decoration:none">vishwas.manral@hp.com</span></a>&gt;, &lt;<a href=
=3D"mailto:swallow@cisco.com"><span style=3D"color:windowtext;text-decorati=
on:none">swallow@cisco.com</span></a>&gt;,
 Loa Andersson <o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt"><span lang=3D"FR-CA"=
>&gt; &gt;&gt; &lt;</span><a href=3D"mailto:loa@pi.nu"><span lang=3D"FR-CA"=
 style=3D"color:windowtext;text-decoration:none">loa@pi.nu</span></a><span =
lang=3D"FR-CA">&gt;, Ross Callon &lt;</span><a href=3D"mailto:rcallon@junip=
er.net"><span lang=3D"FR-CA" style=3D"color:windowtext;text-decoration:none=
">rcallon@juniper.net</span></a><span lang=3D"FR-CA">&gt;,
 MARTIN VIGOUREUX <o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt"><span lang=3D"FR-CA"=
>&gt; &gt;&gt; &lt;</span><a href=3D"mailto:martin.vigoureux@alcatel-lucent=
.com"><span lang=3D"FR-CA" style=3D"color:windowtext;text-decoration:none">=
martin.vigoureux@alcatel-lucent.com</span></a><span lang=3D"FR-CA">&gt;<o:p=
></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt; Resent=
-Date: Friday, August 22, 2014 at 4:35 PM<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; The proposed solution is to have implementations complying to
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; this draft advertise the IPv6 prefix state advertisement control
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; capability<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; (draft-ietf-mpls-ldp-ip-pw-capability-07) in the initialization
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; message explicitly indicating support for LDP IPv6. Without the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; peer advertising this capability, an LSR must not send IPv6
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; addresses and FECs to that peer.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Sp=
eaking as an individual contributor, this seems IMHO to be the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; ri=
ght solution (noting that, in final text as would be published
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; in=
 an RFC, the &quot;must not&quot; in the last sentence should be capitalize=
d).<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Th=
anks, Ross<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; --=
---Original Message-----<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Fr=
om: mpls [<a href=3D"mailto:mpls-bounces@ietf.org"><span style=3D"color:win=
dowtext;text-decoration:none">mailto:mpls-bounces@ietf.org</span></a>] On B=
ehalf Of Aissaoui,
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Mu=
stapha<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; (M=
ustapha)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Se=
nt: Tuesday, August 19, 2014 3:19 AM<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; To=
: <a href=3D"mailto:mpls@ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</span><=
/a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Cc=
: <a href=3D"mailto:mpls-chairs@tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls-chairs@tools.iet=
f.org</span></a>;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; <a=
 href=3D"mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">draft-ietf-mpls-ldp-i=
pv6@tools.ietf.org</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Su=
bject: Re: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; (s=
hort wglc<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; cl=
osed)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; De=
ar all,<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Th=
e following are the details of the issue we found and the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; pr=
oposed solution. We shared this first with the authors to get initial feedb=
ack.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Wh=
en an LSR which supports LDP IPv6 according to this draft is in
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; a =
LAN with a broadcast interface, it can peer with LSRs which
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; su=
pport this draft and LSRs which do not. When it peers using IPv4
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; LD=
P control plane with an LSR which does not support this draft,
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; we=
 have seen during our testing an issue that the advertisement of
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; IP=
v6 addresses or IPv6 FECs to that peer will cause it to bring
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; do=
wn the IPv4 LDP<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; session.<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; In=
 other words, there are deployed LDP implementations which are
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; co=
mpliant to RFC 5036 for LDP IPv4 but are not compliant to RFC
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; 50=
36 when it comes to handling IPv6 address or IPv6 FECs over an
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; LD=
P IPv4<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; session.<o:p></=
o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Th=
is is making us very concerned that when users enable dual-stack
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; LD=
P IPv4/IPv6, they will bring down LDP IPv4 sessions which have
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; be=
en working in a multi-vendor environments for so many years.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Th=
e proposed solution is to have implementations complying to this
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; dr=
aft advertise the IPv6 prefix state advertisement control
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; ca=
pability<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; (d=
raft-ietf-mpls-ldp-ip-pw-capability-07) in the initialization
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; me=
ssage explicitly indicating support for LDP IPv6. Without the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; pe=
er advertising this capability, an LSR must not send IPv6
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; ad=
dresses and FECs to that peer.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Th=
is approach is safer and has been followed when mLDP FEC was
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; in=
troduced as explained in Section 2.1 of RFC 6388. Also, this
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; do=
es not introduce any new TLV to draft-ietf-mpls-ldp-ipv6. It
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; ju=
st makes the exchange of LDP IPv6 addresses and FECs conditional
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; to=
 both peers explicitly indicating support for IPv6 capability
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; du=
ring LDP session<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; initialization.=
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; We=
 do not feel such a simple change justifies writing a new draft
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; an=
d having to deal with backward compatibility of implementations
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; ac=
ross two drafts.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; We=
 appreciate your comments on this matter.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Re=
gards,<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; Mu=
stapha.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; -----Original Message-----<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; From: mpls [<a href=3D"mailto:mpls-bounces@ietf.org"><span style=3D"color=
:windowtext;text-decoration:none">mailto:mpls-bounces@ietf.org</span></a>] =
On Behalf Of Loa
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Andersson<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Sent: Tuesday, August 12, 2014 11:45 AM<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; To: <a href=3D"mailto:mpls@ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</span><=
/a>; <a href=3D"mailto:mpls-chairs@tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls-chairs@tools.iet=
f.org</span></a>;
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; <a href=3D"mailto:draft-ietf-mpls-ldp-ipv6@tools.ietf.org">
<span style=3D"color:windowtext;text-decoration:none">draft-ietf-mpls-ldp-i=
pv6@tools.ietf.org</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Subject: [mpls] Way to progress draft-ietf-mpls-ldp-ipv6 (short
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; wglc<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; closed)<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Working Group,<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; During what we thought would be a short wglc on<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; draft-ietf-mpls-ldp-ipv6<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; <a href=3D"http://www.ietf.org/mail-archive/web/mpls/current/msg12464.htm=
l">
<span style=3D"color:windowtext;text-decoration:none">http://www.ietf.org/m=
ail-archive/web/mpls/current/msg12464.html</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; we had a comment that stopped us from continuing progressing the draft.<o=
:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; The short working group last call is now closed!<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; The comment we refer to was raised in a private mail to the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; working group chairs and the draft authors.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; It says that there are a problem with some RFC 5036 non-compliant
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; implementations deployed and draft-ietf-mpls-ldp-ipv6. There is
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; no detailed description of the exact problems.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; We strongly encourage the people that made the comment(s) to
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; write-up the problem, either as<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; - a new draft (preferred); or<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; - in a mail to the working group mailing list<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Once we an agreement to write a new draft or the write-up to the
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; mailing, we will continue to ask the working group to see if we
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; can agree to a way to progress. We like to see this write-up
<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; before September 1. Failing this we will continue to progress the<o:p></o=
:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; draft-ietf-mpls-ldp-ipv6 as is.<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; /Loa<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; for the working group chairs<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; --<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Loa Andersson&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; email:
<a href=3D"mailto:loa@mail01.huawei.com"><span style=3D"color:windowtext;te=
xt-decoration:none">loa@mail01.huawei.com</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Senior MPLS Expert&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;
<a href=3D"mailto:loa@pi.nu"><span style=3D"color:windowtext;text-decoratio=
n:none">loa@pi.nu</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; Huawei Technologies (consultant)&nbsp;&nbsp;&nbsp;&nbsp; phone: &#43;46 7=
39 81 21 64<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
;<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; _______________________________________________<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; mpls mailing list<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; <a href=3D"mailto:mpls@ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</span><=
/a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;&gt=
; <a href=3D"https://www.ietf.org/mailman/listinfo/mpls">
<span style=3D"color:windowtext;text-decoration:none">https://www.ietf.org/=
mailman/listinfo/mpls</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt;<o:=
p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; __=
_____________________________________________<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; mp=
ls mailing list<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; <a=
 href=3D"mailto:mpls@ietf.org">
<span style=3D"color:windowtext;text-decoration:none">mpls@ietf.org</span><=
/a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;&gt;&gt; <a=
 href=3D"https://www.ietf.org/mailman/listinfo/mpls">
<span style=3D"color:windowtext;text-decoration:none">https://www.ietf.org/=
mailman/listinfo/mpls</span></a><o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">&gt; &gt;<o:p></o:p>=
</p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:5.25pt">____________________=
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From: Daniele Ceccarelli <daniele.ceccarelli@ericsson.com>
To: "Andrew G. Malis" <agmalis@gmail.com>, Loa Andersson <loa@pi.nu>
Thread-Topic: [mpls] poll to se if we have consensus to make draft-kini-mpls-spring-entropy-label an mpls wg document
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Subject: Re: [mpls] poll to se if we have consensus to make draft-kini-mpls-spring-entropy-label an mpls wg document
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From: Kireeti Kompella <kireeti.kompella@gmail.com>
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Hi Huub,

> On Nov 1, 2014, at 06:01 , Huub van Helvoort <huubatwork@gmail.com> =
wrote:
>=20
> Hello Kireeti,
>=20
> I also did a careful reading of this draft.
>=20
> I agree with Greg that the failure of a node is not covered.

My aim is to treat link and node failures the same way.  I don=E2=80=99t =
see much difference in how one would respond, but I=E2=80=99m happy to =
listen to other opinions.

> I also notice that you did not cover that a second failure
> (link/node) that splits the ring in two islands.
> In this case the protection in effect in each of the islands
> should be maintained. You may have the same issue as detected
> by Greg for a single node failure.

Understood.

> I also notice that during the process of changing DS to US
> at each node MPLS packets may get lost or get out of order.
> Is my interpretation correct?

That is correct.  I think that is the case for all protection schemes; =
certainly for MPLS protection schemes.

Cheers,
KIreeti

> Cheers, Huub.
>=20
>=20
> --=20
> *****************************************************************
>              =
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Hi Greg,

> On Nov 1, 2014, at 17:39 , Gregory Mirsky =
<gregory.mirsky@ericsson.com> wrote:
>=20
> Hi Kireeti,
> thank you for your kind consideration, much appreciated.
> Of course, TTL will break the loop and setting it to precise value may =
be one solution. But, as Huub pointed, if ring experienced double =
failure loop still exist though less severe. And since nodes may be =
added and removed from the ring dynamically every node must be aware of =
number of nodes in that ring.

Do you think it is important to deal with dynamic changes during =
protection?

> Thus I personally prefer option #3, (Extended) Special Purpose Label =
(that we can name later). The possible drawback, as with any new (E)SPL =
cases, is that it becomes new capability that now must be advertised as =
such.

I suggested the (E)SPL option, but current reality is that all LSRs =
support TTL processing; it will take time for the SPL approach to be =
implemented in forwarding engines.

> But I agree, let=E2=80=99s list all three options as these are sound =
technical solutions to the realistic scenario and any of TTL based may =
be used by itself or in combination with (E)SPL.

Good, I will do that.

> (E)SPL may be used only if ring is homogeneous in regard to this =
capability.

Actually, for node failure, SPL can be used when the nodes adjacent to =
the egress support the SPL.  But to address Huub=E2=80=99s point (double =
failure), every node would have to support the SPL.

Cheers,
Kireeti.

> =20
>                 Regards,
>                                 Greg
> =20
> From: Kireeti Kompella [mailto:kireeti.kompella@gmail.com]=20
> Sent: Friday, October 31, 2014 6:37 PM
> To: Gregory Mirsky
> Cc: Kireeti Kompella; mpls@ietf.org
> Subject: Re: [mpls] New Version Notification for =
draft-kompella-mpls-rmr-00.txt
> =20
> Hi Greg,
> =20
> On Oct 30, 2014, at 16:21 , Gregory Mirsky =
<gregory.mirsky@ericsson.com <mailto:gregory.mirsky@ericsson.com>> =
wrote:
> =20
> Hi Kireeti,
> I think that proposed in this document protection method creates some =
unpleasant scenario if failure is of a node, not a link. If I use the =
scenario presented in Section 3.6 but assume that the failure is not of =
the link between R_j and R_j+1 but of the node Rj+1. Thus, as R_j =
switches to US direction, the R_j+2 will switch to DS. And until =
notifications from R_j and R_j+2 reach R_j+2 and R_j respectively we =
have routing loop on RL_j+1 LSP.
> =20
> I appreciate your careful reading!  Note of course that since there is =
a TTL, this is a finite loop (not saying it isn=E2=80=99t bad, but that =
this has the germ of the solution.)
> =20
> I have three solutions for this problem. I didn=E2=80=99t put them in =
the first version of the draft; I may eventually document all (and =
others, as the WG chimes in), but meanwhile this discussion is perfect.
> =20
> My preferred solution is to always insert packets on a ring LSP with =
TTL =3D 2N-1 if the ring has N nodes.  This is enough for the worst case =
=E2=80=94 node R_j sends a packet on RL_j+1 the =E2=80=9Clong=E2=80=9D =
way around, only to encounter a failure at node R_j+2, and come all the =
way back to R_j, then R_j+1.
> =20
> Another solution is that an ingress node sets the TTL as usual, but a =
PLR sets the TTL to the smaller of the current TTL-1 and the minimum TTL =
required to reach the egress.    So, in the above example, R_j would set =
TTL as usual, but R_j+2, on detecting a failure, would set TTL =3D N-1 =
and send it the other way.  In this case, when the packet gets back to =
R_j, it should not in turn reset the TTL to N-1.  Of course, both of the =
above can be combined.
> =20
> Finally, a PLR (R_j+2) can push a special purpose label to indicate =
that this is a failure path, then push the label to go the other way.  =
If the packet goes back to R_j, before R_j sends it the other way, it =
sees that the label below the top of stack is this failure label, and =
drops the packet rather than cycle it back around the ring.
> =20
> If my assumptions are correct, then notification mechanism MUST be =
reliable or be backed up by IGP signaling. In any case, the loop may =
persist for quite a while and affect all services.
> =20
> Agreed, having a reliable notification mechanism is always a good =
thing.
>=20
>=20
> Comments, questions are always welcome and greatly appreciated.
> =20
> Greg, since you worked out the problem, do you have any opinions on =
the solutions above, or any of your own?
> =20
> Cheers,
> Kireeti.
> =20
>                 Regards,
>                                 Greg
> =20
> From: mpls [mailto:mpls-bounces@ietf.org =
<mailto:mpls-bounces@ietf.org>] On Behalf Of Kireeti Kompella
> Sent: Wednesday, October 29, 2014 10:41 AM
> To: mpls@ietf.org <mailto:mpls@ietf.org>
> Subject: [mpls] Fwd: New Version Notification for =
draft-kompella-mpls-rmr-00.txt
> =20
> Hi Folks,
> =20
> This is a draft on making MPLS more efficient in ring networks.  I =
have come around to understanding that:
> a) rings are a special topology (there was a time that I didn't =
appreciate that);
> b) MPLS is pretty inefficient in rings (that is/was quite obvious).
> =20
> This draft attempts to fix that, both by making protection much more =
efficient, and by making configuration much easier.
> =20
> Your comments are highly welcome!
> =20
> Cheers,
> Kireeti.
> =20
> ---------- Forwarded message ----------
> From: <internet-drafts@ietf.org <mailto:internet-drafts@ietf.org>>
> Date: Sun, Oct 26, 2014 at 9:15 PM
> Subject: New Version Notification for draft-kompella-mpls-rmr-00.txt
> To: Kireeti Kompella <kireeti.kompella@gmail.com =
<mailto:kireeti.kompella@gmail.com>>
>=20
>=20
>=20
> A new version of I-D, draft-kompella-mpls-rmr-00.txt
> has been successfully submitted by Kireeti Kompella and posted to the
> IETF repository.
>=20
> Name:           draft-kompella-mpls-rmr
> Revision:       00
> Title:          Resilient MPLS Rings
> Document date:  2014-10-26
> Group:          Individual Submission
> Pages:          7
> URL:            =
http://www.ietf.org/internet-drafts/draft-kompella-mpls-rmr-00.txt =
<http://www.ietf.org/internet-drafts/draft-kompella-mpls-rmr-00.txt>
> Status:         =
https://datatracker.ietf.org/doc/draft-kompella-mpls-rmr/ =
<https://datatracker.ietf.org/doc/draft-kompella-mpls-rmr/>
> Htmlized:       http://tools.ietf.org/html/draft-kompella-mpls-rmr-00 =
<http://tools.ietf.org/html/draft-kompella-mpls-rmr-00>
>=20
>=20
> Abstract:
>    This document describes the use of the MPLS control and data planes
>    on ring topologies.  It describes the special nature of rings, and
>    proceeds to show how MPLS can be effectively used in such =
topologies.
>    It describes how MPLS rings are configured, auto-discovered and
>    signaled, as well as how the data plane works.  Companion documents
>    describe the details of discovery and signaling for specific
>    protocols.
>=20
>=20
>=20
>=20
>=20
> Please note that it may take a couple of minutes from the time of =
submission
> until the htmlized version and diff are available at tools.ietf.org =
<http://tools.ietf.org/>.
>=20
> The IETF Secretariat
>=20
>=20
>=20
> =20
> --=20
> Kireeti
> =20


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charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Hi Greg,<div class=3D""><br class=3D""><div =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">On =
Nov 1, 2014, at 17:39 , Gregory Mirsky &lt;<a =
href=3D"mailto:gregory.mirsky@ericsson.com" =
class=3D"">gregory.mirsky@ericsson.com</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D"">

<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8" =
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<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple" class=3D"">
<div class=3D"WordSection1"><p class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif=
&quot;;color:#1F497D" class=3D"">Hi Kireeti,<o:p =
class=3D""></o:p></span></p><p class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif=
&quot;;color:#1F497D" class=3D"">thank you for your kind consideration, =
much appreciated.<o:p class=3D""></o:p></span></p><p =
class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif=
&quot;;color:#1F497D" class=3D"">Of course, TTL will break the loop and =
setting it to precise value may be one solution. But, as Huub pointed, =
if ring experienced double failure loop still
 exist though less severe. And since nodes may be added and removed from =
the ring dynamically every node must be aware of number of nodes in that =
ring.</span></p></div></div></div></blockquote><div><br =
class=3D""></div><div>Do you think it is important to deal with dynamic =
changes during protection?</div><br class=3D""><blockquote type=3D"cite" =
class=3D""><div class=3D""><div lang=3D"EN-US" link=3D"blue" =
vlink=3D"purple" class=3D""><div class=3D"WordSection1"><p =
class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif=
&quot;;color:#1F497D" class=3D""><o:p class=3D""></o:p></span></p><p =
class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif=
&quot;;color:#1F497D" class=3D"">Thus I personally prefer option #3, =
(Extended) Special Purpose Label (that we can name later). The possible =
drawback, as with any new (E)SPL cases, is that
 it becomes new capability that now must be advertised as =
such.</span></p></div></div></div></blockquote><div><br =
class=3D""></div><div>I suggested the (E)SPL option, but current reality =
is that all LSRs support TTL processing; it will take time for the SPL =
approach to be implemented in forwarding engines.</div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div lang=3D"EN-US" =
link=3D"blue" vlink=3D"purple" class=3D""><div class=3D"WordSection1"><p =
class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif=
&quot;;color:#1F497D" class=3D""><o:p class=3D""></o:p></span></p><p =
class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif=
&quot;;color:#1F497D" class=3D"">But I agree, let=E2=80=99s list all =
three options as these are sound technical solutions to the realistic =
scenario and any of TTL based may be used by itself or in
 combination with (E)SPL. </span></p></div></div></blockquote><div><br =
class=3D""></div><div><div>Good, I will do that.</div></div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div lang=3D"EN-US" =
link=3D"blue" vlink=3D"purple" class=3D""><div class=3D"WordSection1"><p =
class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif=
&quot;;color:#1F497D" class=3D"">(E)SPL may be used only if ring is =
homogeneous in regard to this =
capability.</span></p></div></div></blockquote><div><br =
class=3D""></div><div>Actually, for node failure, SPL can be used when =
the nodes adjacent to the egress support the SPL. &nbsp;But to address =
Huub=E2=80=99s point (double failure), every node would have to support =
the SPL.</div><div><br =
class=3D""></div><div>Cheers,</div><div>Kireeti.</div><div><br =
class=3D""></div><blockquote type=3D"cite" class=3D""><div lang=3D"EN-US" =
link=3D"blue" vlink=3D"purple" class=3D""><div class=3D"WordSection1"><p =
class=3D"MsoNormal"><span style=3D"color: rgb(31, 73, 125); font-family: =
Calibri, sans-serif; font-size: 11pt;" class=3D"">&nbsp;</span></p><p =
class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif=
&quot;;color:#1F497D" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp; Regards,<o:p class=3D""></o:p></span></p><p =
class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif=
&quot;;color:#1F497D" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Greg<o:p =
class=3D""></o:p></span></p><p class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif=
&quot;;color:#1F497D" class=3D"">&nbsp;</span></p>
<div class=3D"">
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt =
0in 0in 0in" class=3D""><p class=3D"MsoNormal"><b class=3D""><span =
style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&=
quot;" class=3D"">From:</span></b><span =
style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&=
quot;" class=3D""> Kireeti Kompella [<a =
href=3D"mailto:kireeti.kompella@gmail.com" =
class=3D"">mailto:kireeti.kompella@gmail.com</a>]
<br class=3D"">
<b class=3D"">Sent:</b> Friday, October 31, 2014 6:37 PM<br class=3D"">
<b class=3D"">To:</b> Gregory Mirsky<br class=3D"">
<b class=3D"">Cc:</b> Kireeti Kompella; <a href=3D"mailto:mpls@ietf.org" =
class=3D"">mpls@ietf.org</a><br class=3D"">
<b class=3D"">Subject:</b> Re: [mpls] New Version Notification for =
draft-kompella-mpls-rmr-00.txt<o:p class=3D""></o:p></span></p>
</div>
</div><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p><p =
class=3D"MsoNormal">Hi Greg,<o:p class=3D""></o:p></p>
<div class=3D""><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">On Oct 30, 2014, at 16:21 , =
Gregory Mirsky &lt;<a href=3D"mailto:gregory.mirsky@ericsson.com" =
class=3D"">gregory.mirsky@ericsson.com</a>&gt; wrote:<o:p =
class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
<div class=3D"">
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt" class=3D"">
<div class=3D"">
<div class=3D""><p class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif=
&quot;;color:#1F497D" class=3D"">Hi Kireeti,</span><o:p =
class=3D""></o:p></p><p class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif=
&quot;;color:#1F497D" class=3D"">I think that proposed in this document =
protection method creates some unpleasant scenario if failure is of a =
node, not a link. If I use the scenario presented
 in Section 3.6 but assume that the failure is not of the link between =
R_j and R_j+1 but of the node Rj+1. Thus, as R_j switches to US =
direction, the R_j+2 will switch to DS. And until notifications from R_j =
and R_j+2 reach R_j+2 and R_j respectively we have
 routing loop on RL_j+1 LSP.</span><o:p class=3D""></o:p></p>
</div>
</div>
</blockquote>
<div class=3D""><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">I appreciate your careful =
reading! &nbsp;Note of course that since there is a TTL, this is a =
finite loop (not saying it isn=E2=80=99t bad, but that this has the germ =
of the solution.)<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">I have three solutions for this =
problem. I didn=E2=80=99t put them in the first version of the draft; I =
may eventually document all (and others, as the WG chimes in), but =
meanwhile this discussion is perfect.<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">My preferred solution is to =
always insert packets on a ring LSP with TTL =3D 2N-1 if the ring has N =
nodes. &nbsp;This is enough for the worst case =E2=80=94 node R_j sends =
a packet on RL_j+1 the =E2=80=9Clong=E2=80=9D way around, only to =
encounter a failure at node R_j+2,
 and come all the way back to R_j, then R_j+1.<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">Another solution is that an =
ingress node sets the TTL as usual, but a PLR sets the TTL to the =
smaller of the current TTL-1 and the minimum TTL required to reach the =
egress. &nbsp; &nbsp;So, in the above example, R_j would set TTL as =
usual, but R_j+2,
 on detecting a failure, would set TTL =3D N-1 and send it the other =
way. &nbsp;In this case, when the packet gets back to R_j, it should not =
in turn reset the TTL to N-1. &nbsp;Of course, both of the above can be =
combined.<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">Finally, a PLR (R_j+2) can push a =
special purpose label to indicate that this is a failure path, then push =
the label to go the other way. &nbsp;If the packet goes back to R_j, =
before R_j sends it the other way, it sees that the label below the
 top of stack is this failure label, and drops the packet rather than =
cycle it back around the ring.<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
</div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt" class=3D"">
<div class=3D""><p class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif=
&quot;;color:#1F497D" class=3D"">If my assumptions are correct, then =
notification mechanism MUST be reliable or be backed up by IGP =
signaling. In any case, the loop may persist for quite a
 while and affect all services.</span><o:p class=3D""></o:p></p>
</div>
</blockquote>
<div class=3D""><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">Agreed, having a reliable =
notification mechanism is always a good thing.<o:p class=3D""></o:p></p>
</div><p class=3D"MsoNormal"><br class=3D"">
<br class=3D"">
<o:p class=3D""></o:p></p>
<div class=3D""><p class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif=
&quot;;color:#1F497D" class=3D"">Comments, questions are always welcome =
and greatly appreciated.</span><o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">Greg, since you worked out the =
problem, do you have any opinions on the solutions above, or any of your =
own?<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">Cheers,<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">Kireeti.<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
</div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt" class=3D"">
<div class=3D""><p class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif=
&quot;;color:#1F497D" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;Regards,</span><o:p class=3D""></o:p></p><p =
class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif=
&quot;;color:#1F497D" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Greg</span><o:p =
class=3D""></o:p></p><p class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif=
&quot;;color:#1F497D" class=3D"">&nbsp;</span><o:p class=3D""></o:p></p><p=
 class=3D"MsoNormal"><b class=3D""><span =
style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&=
quot;" class=3D"">From:</span></b><span =
style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&=
quot;" class=3D""> mpls [<a href=3D"mailto:mpls-bounces@ietf.org" =
class=3D"">mailto:mpls-bounces@ietf.org</a>]
<b class=3D"">On Behalf Of </b>Kireeti Kompella<br class=3D"">
<b class=3D"">Sent:</b> Wednesday, October 29, 2014 10:41 AM<br =
class=3D"">
<b class=3D"">To:</b> <a href=3D"mailto:mpls@ietf.org" =
class=3D"">mpls@ietf.org</a><br class=3D"">
<b class=3D"">Subject:</b> [mpls] Fwd: New Version Notification for =
draft-kompella-mpls-rmr-00.txt</span><o:p class=3D""></o:p></p><p =
class=3D"MsoNormal">&nbsp;<o:p class=3D""></o:p></p>
<div class=3D""><p class=3D"MsoNormal">Hi Folks,<o:p class=3D""></o:p></p>=

<div class=3D""><p class=3D"MsoNormal">&nbsp;<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">This is a draft on making MPLS =
more efficient in ring networks.&nbsp; I have come around to =
understanding that:<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">a) rings are a special topology =
(there was a time that I didn't appreciate that);<o:p =
class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">b) MPLS is pretty inefficient in =
rings (that is/was quite obvious).<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">&nbsp;<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">This draft attempts to fix that, =
both by making protection much more efficient, and by making =
configuration much easier.<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">&nbsp;<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">Your comments are highly =
welcome!<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">&nbsp;<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">Cheers,<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">Kireeti.<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">&nbsp;<o:p class=3D""></o:p></p>
<div class=3D""><p class=3D"MsoNormal" =
style=3D"margin-bottom:12.0pt">---------- Forwarded message =
----------<br class=3D"">
From: &lt;<a href=3D"mailto:internet-drafts@ietf.org" =
class=3D"">internet-drafts@ietf.org</a>&gt;<br class=3D"">
Date: Sun, Oct 26, 2014 at 9:15 PM<br class=3D"">
Subject: New Version Notification for draft-kompella-mpls-rmr-00.txt<br =
class=3D"">
To: Kireeti Kompella &lt;<a href=3D"mailto:kireeti.kompella@gmail.com" =
class=3D"">kireeti.kompella@gmail.com</a>&gt;<br class=3D"">
<br class=3D"">
<br class=3D"">
<br class=3D"">
A new version of I-D, draft-kompella-mpls-rmr-00.txt<br class=3D"">
has been successfully submitted by Kireeti Kompella and posted to the<br =
class=3D"">
IETF repository.<br class=3D"">
<br class=3D"">
Name:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;draft-kompella-mpls-rmr<br =
class=3D"">
Revision:&nbsp; &nbsp; &nbsp; &nbsp;00<br class=3D"">
Title:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Resilient MPLS Rings<br =
class=3D"">
Document date:&nbsp; 2014-10-26<br class=3D"">
Group:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Individual Submission<br =
class=3D"">
Pages:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 7<br class=3D"">
URL:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a =
href=3D"http://www.ietf.org/internet-drafts/draft-kompella-mpls-rmr-00.txt=
" target=3D"_blank" class=3D"">
=
http://www.ietf.org/internet-drafts/draft-kompella-mpls-rmr-00.txt</a><br =
class=3D"">
Status:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<a =
href=3D"https://datatracker.ietf.org/doc/draft-kompella-mpls-rmr/" =
target=3D"_blank" =
class=3D"">https://datatracker.ietf.org/doc/draft-kompella-mpls-rmr/</a><b=
r class=3D"">
Htmlized:&nbsp; &nbsp; &nbsp; &nbsp;<a =
href=3D"http://tools.ietf.org/html/draft-kompella-mpls-rmr-00" =
target=3D"_blank" =
class=3D"">http://tools.ietf.org/html/draft-kompella-mpls-rmr-00</a><br =
class=3D"">
<br class=3D"">
<br class=3D"">
Abstract:<br class=3D"">
&nbsp; &nbsp;This document describes the use of the MPLS control and =
data planes<br class=3D"">
&nbsp; &nbsp;on ring topologies.&nbsp; It describes the special nature =
of rings, and<br class=3D"">
&nbsp; &nbsp;proceeds to show how MPLS can be effectively used in such =
topologies.<br class=3D"">
&nbsp; &nbsp;It describes how MPLS rings are configured, auto-discovered =
and<br class=3D"">
&nbsp; &nbsp;signaled, as well as how the data plane works.&nbsp; =
Companion documents<br class=3D"">
&nbsp; &nbsp;describe the details of discovery and signaling for =
specific<br class=3D"">
&nbsp; &nbsp;protocols.<br class=3D"">
<br class=3D"">
<br class=3D"">
<br class=3D"">
<br class=3D"">
<br class=3D"">
Please note that it may take a couple of minutes from the time of =
submission<br class=3D"">
until the htmlized version and diff are available at <a =
href=3D"http://tools.ietf.org/" target=3D"_blank" class=3D"">
tools.ietf.org</a>.<br class=3D"">
<br class=3D"">
The IETF Secretariat<o:p class=3D""></o:p></p>
</div><p class=3D"MsoNormal"><br class=3D"">
<br clear=3D"all" class=3D"">
<o:p class=3D""></o:p></p>
<div class=3D""><p class=3D"MsoNormal">&nbsp;<o:p class=3D""></o:p></p>
</div><p class=3D"MsoNormal">-- <br class=3D"">
Kireeti <o:p class=3D""></o:p></p>
</div>
</div>
</div>
</blockquote>
</div><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
</div>
</div>
</div>

</blockquote></div><br class=3D""></div></div></body></html>=

--Apple-Mail=_11370CB0-2FB0-4231-90A3-F438FDFF3861--


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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: Kireeti Kompella <kireeti.kompella@gmail.com>
Thread-Topic: [mpls] New Version Notification for draft-kompella-mpls-rmr-00.txt
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From: Xuxiaohu <xuxiaohu@huawei.com>
To: "kireeti.kompella@gmail.com" <kireeti.kompella@gmail.com>
Thread-Topic: draft-kompella-mpls-rmr-00
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Date: Wed, 12 Nov 2014 21:33:37 +0000
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--_000_1FEE3F8F5CCDE64C9A8E8F4AD27C19EE082CCD68NKGEML512MBSchi_
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Hi Kireeti,

I have read your draft and found it's very interesting.

I wonder whether it's possible to introduce the idea of the RPR (Resilient =
Packet Ring) technology into the MPLS-enabled ring networks. For instance, =
for a given node on a ring, it has two types of interfaces, one is ring-int=
erface and the other is non-ring-interface. In addition, the ring-interface=
 is either eastward or westward. When receiving an MPLS packet from a non-r=
ing interface, if the next-hop of that MPLS packet is one of its adjacent p=
eers on the ring, it would impose a label indicating clock-wise forwarding =
or count-clock-wise forwarding accordingly. When receiving an MPLS packet w=
ith the top label being the label indicating clock-wise or counter-clock-wi=
se forwarding, unless the next-hop of the FEC which is indicated by the lab=
el below that top label is itself or a peer which is connected via a non-ri=
ng interface (i.e., the packet would pop off the ring), that packet should =
be forwarding according to the top label, e.g., if the top label indicates =
clock-wise forwarding, it would be forwarded in the clock-wise direction.

The label indicating clock-wise or count-clock-wise forwarding could be an =
SPL or a local label which is advertised by each ring node. If that label i=
s a local label, it should be swapped accordingly on each hop of the ring. =
When the packet received from a adjacent peer on the ring should pop off th=
at ring, the top label indicating clock-wise or count-clock-wise forwarding=
 should be stripped before performing the further MPLS forwarding process.

Best regards,
Xiaohu

--_000_1FEE3F8F5CCDE64C9A8E8F4AD27C19EE082CCD68NKGEML512MBSchi_
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi Kireeti,<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I have read your draft and foun=
d it&#8217;s very interesting.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I wonder whether it&#8217;s pos=
sible to introduce the idea of the RPR (Resilient Packet Ring) technology i=
nto the MPLS-enabled ring networks. For instance, for a given node on a rin=
g, it has two types of interfaces, one is
 ring-interface and the other is non-ring-interface. In addition, the ring-=
interface is either eastward or westward. When receiving an MPLS packet fro=
m a non-ring interface, if the next-hop of that MPLS packet is one of its a=
djacent peers on the ring, it would
 impose a label indicating clock-wise forwarding or count-clock-wise forwar=
ding accordingly. When receiving an MPLS packet with the top label being th=
e label indicating clock-wise or counter-clock-wise forwarding, unless the =
next-hop of the FEC which is indicated
 by the label below that top label is itself or a peer which is connected v=
ia a non-ring interface (i.e., the packet would pop off the ring), that pac=
ket should be forwarding according to the top label, e.g., if the top label=
 indicates clock-wise forwarding,
 it would be forwarded in the clock-wise direction. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The label indicating clock-wise=
 or count-clock-wise forwarding could be an SPL or a local label which is a=
dvertised by each ring node. If that label is a local label, it should be s=
wapped accordingly on each hop of the
 ring. When the packet received from a adjacent peer on the ring should pop=
 off that ring, the top label indicating clock-wise or count-clock-wise for=
warding should be stripped before performing the further MPLS forwarding pr=
ocess.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Best regards,<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Xiaohu<o:p></o:p></span></p>
</div>
</body>
</html>

--_000_1FEE3F8F5CCDE64C9A8E8F4AD27C19EE082CCD68NKGEML512MBSchi_--


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Changed milestone "Submit draft-ietf-mpls-deprecate-bgp-entropy-label
for publication", resolved as "Done".

Changed milestone "Submit
draft-ietf-mpls-mldp-in-band-wildcard-encoding for publication",
resolved as "Done".

Changed milestone "Submit draft-ietf-mpls-pim-sm-over-mldp", resolved
as "Done".

URL: http://datatracker.ietf.org/wg/mpls/charter/


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Changed milestone "Submit draft-ietf-mpls-ldp-ip-pw-capability for
publication", resolved as "Done".

Changed milestone "Submit draft-ietf-mpls-proxy-lsp-ping fpr
publication", set due date to January 2015 from September 2014.

URL: http://datatracker.ietf.org/wg/mpls/charter/


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URL: http://datatracker.ietf.org/wg/mpls/charter/


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Changed milestone "draft-ietf-mpls-ipv6-only-gap-03", set state to
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Changed milestone "draft-ietf-mpls-lsp-ping-registry", set state to
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URL: http://datatracker.ietf.org/wg/mpls/charter/


From nobody Thu Nov 13 00:12:57 2014
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From: "Dongjie (Jimmy)" <jie.dong@huawei.com>
To: Kireeti Kompella <kireeti.kompella@gmail.com>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] Fwd: New Version Notification for draft-kompella-mpls-rmr-00.txt
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Subject: Re: [mpls] Fwd: New Version Notification for draft-kompella-mpls-rmr-00.txt
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Hello Kireeti,

See my response in-line [hh]
>> I also did a careful reading of this draft.
>>
>> I agree with Greg that the failure of a node is not covered.
>
> My aim is to treat link and node failures the same way.
 > I don’t see much difference in how one would respond,
 > but I’m happy to listen to other opinions.

[hh] If I understand the draft well enough: node J detects
failure of the link JK between node J and K (whether that is
due to link JK failure or node K failure does not matter).
Node J switches traffic from US to DS and sens a message DS to
node K (unaware of the possibility that node K has failed).
Node L receives the message, but cannot forward it to the
failed node K.
What happens in this case?

>> I also notice that you did not cover that a second failure
>> (link/node) that splits the ring in two islands.
>> In this case the protection in effect in each of the islands
>> should be maintained. You may have the same issue as detected
>> by Greg for a single node failure.
>
> Understood.

[hh] OK.

>> I also notice that during the process of changing DS to US
>> at each node MPLS packets may get lost or get out of order.
>> Is my interpretation correct?
>
> That is correct.  I think that is the case for all protection
 > schemes; certainly for MPLS protection schemes.

[hh] what is described in your draft I would call "steering"
at the ingress node.
draft-cheng-mpls-tp-shared-ring-protection used "wrapping"
Wrapping has the advantage that packets are lost only during
the defect detection time.
Steering has additional time, the switch times at every node
between the node detecting the failure until the DS message
reaches the ingress node.

Cheers, Huub.

-- 
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Hello Xuxiaohu, 您好

You wrote:

> I have read your draft and found it’s very interesting.
>
> I wonder whether it’s possible to introduce the idea of the RPR
> (Resilient Packet Ring) technology into the MPLS-enabled ring networks.

RPR is designed specifically for connectionless technologies
like native Ethernet and IP.

MPLS is connection oriented, applying RPR may be very complex.

祝好，best regards, Huub.


-- 
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From nobody Thu Nov 13 09:15:19 2014
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: "huubatwork@gmail.com" <huubatwork@gmail.com>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] draft-kompella-mpls-rmr-00
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To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, "Osborne, Eric" <eric.osborne@level3.com>, "huubatwork@gmail.com" <huubatwork@gmail.com>, "mpls@ietf.org" <mpls@ietf.org>
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From: "Osborne, Eric" <eric.osborne@level3.com>
To: "LEVRAU, LIEVEN (LIEVEN)" <lieven.levrau@alcatel-lucent.com>, "Alexander Vainshtein" <Alexander.Vainshtein@ecitele.com>, "huubatwork@gmail.com" <huubatwork@gmail.com>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] draft-kompella-mpls-rmr-00
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: "LEVRAU, LIEVEN (LIEVEN)" <lieven.levrau@alcatel-lucent.com>, "Alexander Vainshtein" <Alexander.Vainshtein@ecitele.com>, "Osborne, Eric" <eric.osborne@level3.com>, "huubatwork@gmail.com" <huubatwork@gmail.com>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] draft-kompella-mpls-rmr-00
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Date: Thu, 13 Nov 2014 19:12:06 +0000
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--_000_7347100B5761DC41A166AC17F22DF1121B8805CDeusaamb103erics_--


From nobody Thu Nov 13 11:26:05 2014
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Date: Thu, 13 Nov 2014 20:22:19 +0100
From: Loa Andersson <loa@pi.nu>
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To: "LEVRAU, LIEVEN (LIEVEN)" <lieven.levrau@alcatel-lucent.com>,  Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, "Osborne, Eric" <eric.osborne@level3.com>,  "huubatwork@gmail.com" <huubatwork@gmail.com>, "mpls@ietf.org" <mpls@ietf.org>
References: <017fdc7b802a41caad7953a5bd73da6d@DB3PR03MB0812.eurprd03.prod.outlook.com> <D08ABEC7.12B432%lieven.levrau@alcatel-lucent.com>
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Subject: Re: [mpls] draft-kompella-mpls-rmr-00
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Lieven, et.al.,

Maybe because the different control planes makes the data plane behave
different?

I think it is worth looking into the RPR as Xiaohu suggested.

Also we should follow up what Jie Dong said about aligning different
ring protection draft.

What we said before is that we might do solutions for specific
topologies if it comes with enough advantages, for shared ring I
believe this is adequately demonstrated and the rmr has a bit to
go. Maybe it would be best to team up on that work als..

/Loa

On 2014-11-13 20:04, LEVRAU, LIEVEN (LIEVEN) wrote:
> Interesting – question for clarification:
>   why is a control plane aspect dictating how the data plane will be
> connection oriented or not?
>
> Unless the definition of connection oriented technologies have a control
> plane aspect that I am not aware off
> ./
> Lieven
>
> From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com
> <mailto:Alexander.Vainshtein@ecitele.com>>
> Date: Thursday 13 November 2014 17:45
> To: "Osborne, Eric" <eric.osborne@level3.com
> <mailto:eric.osborne@level3.com>>, "huubatwork@gmail.com
> <mailto:huubatwork@gmail.com>" <huubatwork@gmail.com
> <mailto:huubatwork@gmail.com>>, "mpls@ietf.org <mailto:mpls@ietf.org>"
> <mpls@ietf.org <mailto:mpls@ietf.org>>
> Subject: Re: [mpls] draft-kompella-mpls-rmr-00
>
> Could not express this better...
>
> Eric,
>
> Lots of thanks!
>
> Thumb typed on my LG,
> Sasha
>
> ------ Original message ------
> *From: *Osborne, Eric
> *Date: *13/11/2014 18:38
> *To: *huubatwork@gmail.com <mailto:huubatwork@gmail.com>;mpls@ietf.org
> <mailto:mpls@ietf.org>;
> *Subject:*Re: [mpls] draft-kompella-mpls-rmr-00
>
> MPLS-TE and -TP are connection oriented.  LDP is not; if RPR works for
> IP it ought to work with LDP.
>
>
>
>
>
> eric
>
>> -----Original Message-----
>> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Huub van Helvoort
>> Sent: Thursday, November 13, 2014 11:02 AM
>> To:mpls@ietf.org <mailto:mpls@ietf.org>
>> Subject: Re: [mpls] draft-kompella-mpls-rmr-00
>>
>> Hello Xuxiaohu, 您好
>>
>> You wrote:
>>
>> > I have read your draft and found it’s very interesting.
>> >
>> > I wonder whether it’s possible to introduce the idea of the RPR
>> > (Resilient Packet Ring) technology into the MPLS-enabled ring networks.
>>
>> RPR is designed specifically for connectionless technologies like native
>> Ethernet and IP.
>>
>> MPLS is connection oriented, applying RPR may be very complex.
>>
>> 祝好，best regards, Huub.
>>
>>
>> --
>> **********************************************************
>> *******
>>                请记住，你是独一无二的，就像其他每一个人一样
>>
>> _______________________________________________
>> mpls mailing list
>>mpls@ietf.org <mailto:mpls@ietf.org>
>>https://www.ietf.org/mailman/listinfo/mpls
> _______________________________________________
> mpls mailing list
> mpls@ietf.org <mailto:mpls@ietf.org>
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>
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


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From: Kireeti Kompella <kireeti.kompella@gmail.com>
In-Reply-To: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE082CCD68@NKGEML512-MBS.china.huawei.com>
Date: Thu, 13 Nov 2014 10:17:08 -1000
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References: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE082CCD68@NKGEML512-MBS.china.huawei.com>
To: Xuxiaohu <xuxiaohu@huawei.com>
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Subject: Re: [mpls] draft-kompella-mpls-rmr-00
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Hi Xiaohu,

On Nov 12, 2014, at 11:33 , Xuxiaohu <xuxiaohu@huawei.com> wrote:

> Hi Kireeti,
> =20
> I have read your draft and found it=E2=80=99s very interesting.

Thank you!

> I wonder whether it=E2=80=99s possible to introduce the idea of the =
RPR (Resilient Packet Ring) technology into the MPLS-enabled ring =
networks. For instance, for a given node on a ring, it has two types of =
interfaces, one is ring-interface and the other is non-ring-interface. =
In addition, the ring-interface is either eastward or westward. When =
receiving an MPLS packet from a non-ring interface, if the next-hop of =
that MPLS packet is one of its adjacent peers on the ring, it would =
impose a label indicating clock-wise forwarding or count-clock-wise =
forwarding accordingly. When receiving an MPLS packet with the top label =
being the label indicating clock-wise or counter-clock-wise forwarding, =
unless the next-hop of the FEC which is indicated by the label below =
that top label is itself or a peer which is connected via a non-ring =
interface (i.e., the packet would pop off the ring), that packet should =
be forwarding according to the top label, e.g., if the top label =
indicates clock-wise forwarding, it would be forwarded in the clock-wise =
direction.=20
> =20
> The label indicating clock-wise or count-clock-wise forwarding could =
be an SPL or a local label which is advertised by each ring node. If =
that label is a local label, it should be swapped accordingly on each =
hop of the ring. When the packet received from a adjacent peer on the =
ring should pop off that ring, the top label indicating clock-wise or =
count-clock-wise forwarding should be stripped before performing the =
further MPLS forwarding process.

Good comment.  Let me see if I understand.  Let=E2=80=99s say that the =
ring has N nodes.  The way I would do this, each node has 2*(N-1) labels =
to reach each of the other (N-1) nodes in the two directions (CW or =
CCW).

What you are suggesting is to have a two-label stack; the outer label =
says CW or CCW; the inner label says what the egress ring node is.  So, =
each node has (N-1) inner labels.

So, you are optimizing 2*(N-1) to (N-1) by using hierarchy.  Is N large =
enough to make this worthwhile?

Note that "unless the next-hop of the FEC which is indicated by the =
label below that top label is itself=E2=80=9D is a non-trivial =
forwarding step.  I.e., each node needs to look at two labels to =
determine how to forward the packet.

However, to reach non-ring nodes, I fully support using hierarchy.

Cheers,
Kireeti.

> Best regards,
> Xiaohu


--Apple-Mail=_C94C5812-8E3F-4F60-AD9C-CBC2B80758DD
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><div class=3D"">Hi Xiaohu,</div><div class=3D""><br =
class=3D""></div>On Nov 12, 2014, at 11:33 , Xuxiaohu &lt;<a =
href=3D"mailto:xuxiaohu@huawei.com" class=3D"">xuxiaohu@huawei.com</a>&gt;=
 wrote:<div class=3D""><br class=3D""><div><blockquote type=3D"cite" =
class=3D""><div class=3D"WordSection1" style=3D"page: WordSection1; =
font-family: Helvetica; font-size: 14px; font-style: normal; =
font-variant: normal; font-weight: normal; letter-spacing: normal; =
line-height: normal; orphans: auto; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; widows: auto; word-spacing: =
0px; -webkit-text-stroke-width: 0px;"><div style=3D"margin: 0cm 0cm =
0.0001pt; text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;" class=3D""><span lang=3D"EN-US" class=3D"">Hi Kireeti,<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;" class=3D""><span lang=3D"EN-US" =
class=3D"">&nbsp;</span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;" class=3D""><span lang=3D"EN-US" class=3D"">I have read your =
draft and found it=E2=80=99s very =
interesting.</span></div></div></blockquote><div><br =
class=3D""></div><div>Thank you!</div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D"WordSection1" style=3D"page: =
WordSection1; font-family: Helvetica; font-size: 14px; font-style: =
normal; font-variant: normal; font-weight: normal; letter-spacing: =
normal; line-height: normal; orphans: auto; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; widows: =
auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div =
style=3D"margin: 0cm 0cm 0.0001pt; text-align: justify; font-size: =
10.5pt; font-family: Calibri, sans-serif;" class=3D""><span lang=3D"EN-US"=
 class=3D"">I wonder whether it=E2=80=99s possible to introduce the idea =
of the RPR (Resilient Packet Ring) technology into the MPLS-enabled ring =
networks. For instance, for a given node on a ring, it has two types of =
interfaces, one is ring-interface and the other is non-ring-interface. =
In addition, the ring-interface is either eastward or westward. When =
receiving an MPLS packet from a non-ring interface, if the next-hop of =
that MPLS packet is one of its adjacent peers on the ring, it would =
impose a label indicating clock-wise forwarding or count-clock-wise =
forwarding accordingly. When receiving an MPLS packet with the top label =
being the label indicating clock-wise or counter-clock-wise forwarding, =
unless the next-hop of the FEC which is indicated by the label below =
that top label is itself or a peer which is connected via a non-ring =
interface (i.e., the packet would pop off the ring), that packet should =
be forwarding according to the top label, e.g., if the top label =
indicates clock-wise forwarding, it would be forwarded in the clock-wise =
direction.<span class=3D"Apple-converted-space">&nbsp;</span><o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;" class=3D""><span lang=3D"EN-US" =
class=3D"">&nbsp;</span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;" class=3D""><span lang=3D"EN-US" class=3D"">The label =
indicating clock-wise or count-clock-wise forwarding could be an SPL or =
a local label which is advertised by each ring node. If that label is a =
local label, it should be swapped accordingly on each hop of the ring. =
When the packet received from a adjacent peer on the ring should pop off =
that ring, the top label indicating clock-wise or count-clock-wise =
forwarding should be stripped before performing the further MPLS =
forwarding process.</span></div></div></blockquote><div><br =
class=3D""></div><div>Good comment. &nbsp;Let me see if I understand. =
&nbsp;Let=E2=80=99s say that the ring has N nodes. &nbsp;The way I would =
do this, each node has 2*(N-1) labels to reach each of the other (N-1) =
nodes in the two directions (CW or CCW).</div><div><br =
class=3D""></div><div>What you are suggesting is to have a two-label =
stack; the outer label says CW or CCW; the inner label says what the =
egress ring node is. &nbsp;So, each node has (N-1) inner =
labels.</div><div><br class=3D""></div><div>So, you are optimizing =
2*(N-1) to (N-1) by using hierarchy. &nbsp;Is N large enough to make =
this worthwhile?</div><div><br class=3D""></div><div style=3D"text-align: =
justify;">Note that "<span style=3D"text-align: justify;" class=3D""><font=
 face=3D"Calibri, sans-serif" class=3D""><span style=3D"font-size: =
10.5pt;" class=3D"">unless the next-hop of the FEC which is indicated by =
the label below that top label is itself</span>=E2=80=9D<span =
style=3D"font-size: 10.5pt;" class=3D"">&nbsp;</span></font></span>is a =
non-trivial forwarding step. &nbsp;I.e., each node needs to look at two =
labels to determine how to forward the packet.</div><div =
style=3D"text-align: justify;"><br class=3D""></div><div =
style=3D"text-align: justify;">However, to reach non-ring nodes, I fully =
support using hierarchy.</div><div style=3D"text-align: justify;"><br =
class=3D""></div><div style=3D"text-align: justify;">Cheers,</div><div =
style=3D"text-align: justify;">Kireeti.</div><div style=3D"text-align: =
justify;"><span style=3D"text-align: justify;" class=3D""><font =
face=3D"Calibri, sans-serif" class=3D""><span style=3D"font-size: =
10.5pt;" class=3D""><br class=3D""></span></font></span></div><blockquote =
type=3D"cite" class=3D""><div class=3D"WordSection1" style=3D"page: =
WordSection1; font-family: Helvetica; font-size: 14px; font-style: =
normal; font-variant: normal; font-weight: normal; letter-spacing: =
normal; line-height: normal; orphans: auto; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; widows: =
auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div =
style=3D"margin: 0cm 0cm 0.0001pt; text-align: justify; font-size: =
10.5pt; font-family: Calibri, sans-serif;" class=3D""><span lang=3D"EN-US"=
 class=3D"">Best regards,<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; text-align: justify; font-size: =
10.5pt; font-family: Calibri, sans-serif;" class=3D""><span lang=3D"EN-US"=
 class=3D"">Xiaohu</span></div></div></blockquote></div><br =
class=3D""></div></body></html>=

--Apple-Mail=_C94C5812-8E3F-4F60-AD9C-CBC2B80758DD--


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From: Shahram Davari <davari@broadcom.com>
To: Kireeti Kompella <kireeti.kompella@gmail.com>, Xuxiaohu <xuxiaohu@huawei.com>
Thread-Topic: [mpls] draft-kompella-mpls-rmr-00
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From: Kireeti Kompella <kireeti.kompella@gmail.com>
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Date: Thu, 13 Nov 2014 10:28:58 -1000
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To: Gregory Mirsky <gregory.mirsky@ericsson.com>
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Hi Greg,

On Nov 12, 2014, at 10:50 , Gregory Mirsky <gregory.mirsky@ericsson.com> =
wrote:

> Hi Kireeti,
> I think of dynamic changes to a ring as operator induced, controlled =
defect.

Good =E2=80=94 we=E2=80=99re on the same page.

> I think that there should be requirement that flows to unaffected by =
the change nodes, more when removing a node, be unaffected.

Good point.  I will add text to address this.

> Whether that be result of explicitly putting links at adjacent =
neighbors into Lock state thus triggering protection switchover or of =
some other action, i.e. propagating OAM update that node K is down, we =
can discuss. But I believe that such changes in the ring should work =
without disrupting other services. It is possible that controlled =
topology change and failure happen in what practically can be viewed =
simultaneously so that protection actions to both overlap. In such case, =
I think, we have what Huub characterize as ring double failure.

Okay, that makes more sense now.

Kireeti.

> =20
>                 Regards,
>                                 Greg
> =20
> From: Kireeti Kompella [mailto:kireeti.kompella@gmail.com]=20
> Sent: Wednesday, November 12, 2014 12:06 PM
> To: Gregory Mirsky
> Cc: Kireeti Kompella; mpls@ietf.org
> Subject: Re: [mpls] New Version Notification for =
draft-kompella-mpls-rmr-00.txt
> =20
> Hi Greg,
> =20
> On Nov 1, 2014, at 17:39 , Gregory Mirsky <gregory.mirsky@ericsson.com =
<mailto:gregory.mirsky@ericsson.com>> wrote:
> =20
> Hi Kireeti,
> thank you for your kind consideration, much appreciated.
> Of course, TTL will break the loop and setting it to precise value may =
be one solution. But, as Huub pointed, if ring experienced double =
failure loop still exist though less severe. And since nodes may be =
added and removed from the ring dynamically every node must be aware of =
number of nodes in that ring.
> =20
> Do you think it is important to deal with dynamic changes during =
protection?
>=20
>=20
> Thus I personally prefer option #3, (Extended) Special Purpose Label =
(that we can name later). The possible drawback, as with any new (E)SPL =
cases, is that it becomes new capability that now must be advertised as =
such.
> =20
> I suggested the (E)SPL option, but current reality is that all LSRs =
support TTL processing; it will take time for the SPL approach to be =
implemented in forwarding engines.
>=20
>=20
> But I agree, let=E2=80=99s list all three options as these are sound =
technical solutions to the realistic scenario and any of TTL based may =
be used by itself or in combination with (E)SPL.=20
> =20
> Good, I will do that.
>=20
>=20
> (E)SPL may be used only if ring is homogeneous in regard to this =
capability.
> =20
> Actually, for node failure, SPL can be used when the nodes adjacent to =
the egress support the SPL.  But to address Huub=E2=80=99s point (double =
failure), every node would have to support the SPL.
> =20
> Cheers,
> Kireeti.
> =20
> =20
>                 Regards,
>                                 Greg
> =20
> From: Kireeti Kompella [mailto:kireeti.kompella@gmail.com =
<mailto:kireeti.kompella@gmail.com>]=20
> Sent: Friday, October 31, 2014 6:37 PM
> To: Gregory Mirsky
> Cc: Kireeti Kompella; mpls@ietf.org <mailto:mpls@ietf.org>
> Subject: Re: [mpls] New Version Notification for =
draft-kompella-mpls-rmr-00.txt
> =20
> Hi Greg,
> =20
> On Oct 30, 2014, at 16:21 , Gregory Mirsky =
<gregory.mirsky@ericsson.com <mailto:gregory.mirsky@ericsson.com>> =
wrote:
> =20
> Hi Kireeti,
> I think that proposed in this document protection method creates some =
unpleasant scenario if failure is of a node, not a link. If I use the =
scenario presented in Section 3.6 but assume that the failure is not of =
the link between R_j and R_j+1 but of the node Rj+1. Thus, as R_j =
switches to US direction, the R_j+2 will switch to DS. And until =
notifications from R_j and R_j+2 reach R_j+2 and R_j respectively we =
have routing loop on RL_j+1 LSP.
> =20
> I appreciate your careful reading!  Note of course that since there is =
a TTL, this is a finite loop (not saying it isn=E2=80=99t bad, but that =
this has the germ of the solution.)
> =20
> I have three solutions for this problem. I didn=E2=80=99t put them in =
the first version of the draft; I may eventually document all (and =
others, as the WG chimes in), but meanwhile this discussion is perfect.
> =20
> My preferred solution is to always insert packets on a ring LSP with =
TTL =3D 2N-1 if the ring has N nodes.  This is enough for the worst case =
=E2=80=94 node R_j sends a packet on RL_j+1 the =E2=80=9Clong=E2=80=9D =
way around, only to encounter a failure at node R_j+2, and come all the =
way back to R_j, then R_j+1.
> =20
> Another solution is that an ingress node sets the TTL as usual, but a =
PLR sets the TTL to the smaller of the current TTL-1 and the minimum TTL =
required to reach the egress.    So, in the above example, R_j would set =
TTL as usual, but R_j+2, on detecting a failure, would set TTL =3D N-1 =
and send it the other way.  In this case, when the packet gets back to =
R_j, it should not in turn reset the TTL to N-1.  Of course, both of the =
above can be combined.
> =20
> Finally, a PLR (R_j+2) can push a special purpose label to indicate =
that this is a failure path, then push the label to go the other way.  =
If the packet goes back to R_j, before R_j sends it the other way, it =
sees that the label below the top of stack is this failure label, and =
drops the packet rather than cycle it back around the ring.
> =20
> If my assumptions are correct, then notification mechanism MUST be =
reliable or be backed up by IGP signaling. In any case, the loop may =
persist for quite a while and affect all services.
> =20
> Agreed, having a reliable notification mechanism is always a good =
thing.
>=20
>=20
>=20
> Comments, questions are always welcome and greatly appreciated.
> =20
> Greg, since you worked out the problem, do you have any opinions on =
the solutions above, or any of your own?
> =20
> Cheers,
> Kireeti.
> =20
>                 Regards,
>                                 Greg
> =20
> From: mpls [mailto:mpls-bounces@ietf.org =
<mailto:mpls-bounces@ietf.org>] On Behalf Of Kireeti Kompella
> Sent: Wednesday, October 29, 2014 10:41 AM
> To: mpls@ietf.org <mailto:mpls@ietf.org>
> Subject: [mpls] Fwd: New Version Notification for =
draft-kompella-mpls-rmr-00.txt
> =20
> Hi Folks,
> =20
> This is a draft on making MPLS more efficient in ring networks.  I =
have come around to understanding that:
> a) rings are a special topology (there was a time that I didn't =
appreciate that);
> b) MPLS is pretty inefficient in rings (that is/was quite obvious).
> =20
> This draft attempts to fix that, both by making protection much more =
efficient, and by making configuration much easier.
> =20
> Your comments are highly welcome!
> =20
> Cheers,
> Kireeti.
> =20
> ---------- Forwarded message ----------
> From: <internet-drafts@ietf.org <mailto:internet-drafts@ietf.org>>
> Date: Sun, Oct 26, 2014 at 9:15 PM
> Subject: New Version Notification for draft-kompella-mpls-rmr-00.txt
> To: Kireeti Kompella <kireeti.kompella@gmail.com =
<mailto:kireeti.kompella@gmail.com>>
>=20
>=20
>=20
> A new version of I-D, draft-kompella-mpls-rmr-00.txt
> has been successfully submitted by Kireeti Kompella and posted to the
> IETF repository.
>=20
> Name:           draft-kompella-mpls-rmr
> Revision:       00
> Title:          Resilient MPLS Rings
> Document date:  2014-10-26
> Group:          Individual Submission
> Pages:          7
> URL:            =
http://www.ietf.org/internet-drafts/draft-kompella-mpls-rmr-00.txt =
<http://www.ietf.org/internet-drafts/draft-kompella-mpls-rmr-00.txt>
> Status:         =
https://datatracker.ietf.org/doc/draft-kompella-mpls-rmr/ =
<https://datatracker.ietf.org/doc/draft-kompella-mpls-rmr/>
> Htmlized:       http://tools.ietf.org/html/draft-kompella-mpls-rmr-00 =
<http://tools.ietf.org/html/draft-kompella-mpls-rmr-00>
>=20
>=20
> Abstract:
>    This document describes the use of the MPLS control and data planes
>    on ring topologies.  It describes the special nature of rings, and
>    proceeds to show how MPLS can be effectively used in such =
topologies.
>    It describes how MPLS rings are configured, auto-discovered and
>    signaled, as well as how the data plane works.  Companion documents
>    describe the details of discovery and signaling for specific
>    protocols.
>=20
>=20
>=20
>=20
>=20
> Please note that it may take a couple of minutes from the time of =
submission
> until the htmlized version and diff are available at tools.ietf.org =
<http://tools.ietf.org/>.
>=20
> The IETF Secretariat
>=20
>=20
>=20
> =20
> --=20
> Kireeti=20


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><div class=3D"">Hi Greg,</div><div class=3D""><br =
class=3D""></div>On Nov 12, 2014, at 10:50 , Gregory Mirsky &lt;<a =
href=3D"mailto:gregory.mirsky@ericsson.com" =
class=3D"">gregory.mirsky@ericsson.com</a>&gt; wrote:<div class=3D""><br =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; font-family: =
Helvetica; font-size: 14px; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; line-height: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;"><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">Hi Kireeti,<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">I think of dynamic changes to a ring as =
operator induced, controlled defect. =
</span></div></div></div></blockquote><div><br class=3D""></div>Good =E2=80=
=94 we=E2=80=99re on the same page.</div><div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D""><div class=3D"WordSection1" =
style=3D"page: WordSection1; font-family: Helvetica; font-size: 14px; =
font-style: normal; font-variant: normal; font-weight: normal; =
letter-spacing: normal; line-height: normal; orphans: auto; text-align: =
start; text-indent: 0px; text-transform: none; white-space: normal; =
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">I =
think that there should be requirement that flows to unaffected by the =
change nodes, more when removing a node, be unaffected. =
</span></div></div></div></blockquote><div><br class=3D""></div><div>Good =
point. &nbsp;I will add text to address this.</div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; font-family: =
Helvetica; font-size: 14px; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; line-height: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;"><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">Whether that be result of explicitly =
putting links at adjacent neighbors into Lock state thus triggering =
protection switchover or of some other action, i.e. propagating OAM =
update that node K is down, we can discuss. But I believe that such =
changes in the ring should work without disrupting other services. It is =
possible that controlled topology change and failure happen in what =
practically can be viewed simultaneously so that protection actions to =
both overlap. In such case, I think, we have what Huub characterize as =
ring double failure.</span></div></div></div></blockquote><div><br =
class=3D""></div><div>Okay, that makes more sense now.</div><div><br =
class=3D""></div><div>Kireeti.</div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D""><div class=3D"WordSection1" =
style=3D"page: WordSection1; font-family: Helvetica; font-size: 14px; =
font-style: normal; font-variant: normal; font-weight: normal; =
letter-spacing: normal; line-height: normal; orphans: auto; text-align: =
start; text-indent: 0px; text-transform: none; white-space: normal; =
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D""></o:p></span></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;</span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp; Regards,<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Greg<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">&nbsp;</span></div><div class=3D""><div =
style=3D"border-style: solid none none; border-top-color: rgb(181, 196, =
223); border-top-width: 1pt; padding: 3pt 0in 0in;" class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><b class=3D""><span style=3D"font-size: =
10pt; font-family: Tahoma, sans-serif;" class=3D"">From:</span></b><span =
style=3D"font-size: 10pt; font-family: Tahoma, sans-serif;" =
class=3D""><span class=3D"Apple-converted-space">&nbsp;</span>Kireeti =
Kompella [<a href=3D"mailto:kireeti.kompella@gmail.com" =
class=3D"">mailto:kireeti.kompella@gmail.com</a>]<span =
class=3D"Apple-converted-space">&nbsp;</span><br class=3D""><b =
class=3D"">Sent:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Wednesday, November 12, =
2014 12:06 PM<br class=3D""><b class=3D"">To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Gregory Mirsky<br =
class=3D""><b class=3D"">Cc:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Kireeti Kompella; <a =
href=3D"mailto:mpls@ietf.org" class=3D"">mpls@ietf.org</a><br =
class=3D""><b class=3D"">Subject:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Re: [mpls] New Version =
Notification for draft-kompella-mpls-rmr-00.txt<o:p =
class=3D""></o:p></span></div></div></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">Hi Greg,<o:p class=3D""></o:p></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div><div =
class=3D""><div class=3D""><blockquote style=3D"margin-top: 5pt; =
margin-bottom: 5pt;" class=3D""><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">On Nov 1, 2014, at 17:39 , Gregory Mirsky &lt;<a =
href=3D"mailto:gregory.mirsky@ericsson.com" style=3D"color: purple; =
text-decoration: underline;" =
class=3D"">gregory.mirsky@ericsson.com</a>&gt; wrote:<o:p =
class=3D""></o:p></div></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">Hi =
Kireeti,</span><o:p class=3D""></o:p></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">thank you for your kind =
consideration, much appreciated.</span><o:p class=3D""></o:p></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">Of =
course, TTL will break the loop and setting it to precise value may be =
one solution. But, as Huub pointed, if ring experienced double failure =
loop still exist though less severe. And since nodes may be added and =
removed from the ring dynamically every node must be aware of number of =
nodes in that ring.</span><o:p =
class=3D""></o:p></div></div></div></blockquote><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">Do you think it is important to deal with dynamic =
changes during protection?<o:p class=3D""></o:p></div></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><br class=3D""><br class=3D""><o:p =
class=3D""></o:p></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">Thus I personally prefer option #3, (Extended) Special =
Purpose Label (that we can name later). The possible drawback, as with =
any new (E)SPL cases, is that it becomes new capability that now must be =
advertised as such.</span><o:p class=3D""></o:p></div></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">I suggested the (E)SPL option, but current reality is =
that all LSRs support TTL processing; it will take time for the SPL =
approach to be implemented in forwarding engines.<o:p =
class=3D""></o:p></div></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><br =
class=3D""><br class=3D""><o:p class=3D""></o:p></div><div class=3D""><div=
 style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">But=
 I agree, let=E2=80=99s list all three options as these are sound =
technical solutions to the realistic scenario and any of TTL based may =
be used by itself or in combination with (E)SPL.<span =
class=3D"Apple-converted-space">&nbsp;</span></span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D"">Good, I will do =
that.<o:p class=3D""></o:p></div></div></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><br class=3D""><br class=3D""><o:p class=3D""></o:p></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">(E)SPL may be used only if ring is =
homogeneous in regard to this capability.</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Actually, for node failure, SPL can be =
used when the nodes adjacent to the egress support the SPL. &nbsp;But to =
address Huub=E2=80=99s point (double failure), every node would have to =
support the SPL.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">Cheers,<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D"">Kireeti.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><blockquote =
style=3D"margin-top: 5pt; margin-bottom: 5pt;" class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">&nbsp;</span><o:p =
class=3D""></o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp; Regards,</span><o:p =
class=3D""></o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Greg</span><o:p =
class=3D""></o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">&nbsp;</span><o:p =
class=3D""></o:p></div><div class=3D""><div style=3D"border-style: solid =
none none; border-top-color: rgb(181, 196, 223); border-top-width: 1pt; =
padding: 3pt 0in 0in;" class=3D""><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><b class=3D""><span style=3D"font-size: 10pt; font-family: =
Tahoma, sans-serif;" class=3D"">From:</span></b><span style=3D"font-size: =
10pt; font-family: Tahoma, sans-serif;" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>Kireeti Kompella [<a =
href=3D"mailto:kireeti.kompella@gmail.com" style=3D"color: purple; =
text-decoration: underline;" =
class=3D"">mailto:kireeti.kompella@gmail.com</a>]<span =
class=3D"Apple-converted-space">&nbsp;</span><br class=3D""><b =
class=3D"">Sent:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Friday, October 31, 2014 =
6:37 PM<br class=3D""><b class=3D"">To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Gregory Mirsky<br =
class=3D""><b class=3D"">Cc:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Kireeti Kompella;<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:mpls@ietf.org" style=3D"color: purple; text-decoration: =
underline;" class=3D"">mpls@ietf.org</a><br class=3D""><b =
class=3D"">Subject:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Re: [mpls] New Version =
Notification for draft-kompella-mpls-rmr-00.txt</span><o:p =
class=3D""></o:p></div></div></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">&nbsp;<o:p class=3D""></o:p></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">Hi Greg,<o:p class=3D""></o:p></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">On Oct 30, 2014, at 16:21 , Gregory Mirsky &lt;<a =
href=3D"mailto:gregory.mirsky@ericsson.com" style=3D"color: purple; =
text-decoration: underline;" =
class=3D"">gregory.mirsky@ericsson.com</a>&gt; wrote:<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">&nbsp;<o:p class=3D""></o:p></div><div class=3D""><blockquote =
style=3D"margin-top: 5pt; margin-bottom: 5pt;" class=3D""><div =
class=3D""><div class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">Hi Kireeti,</span><o:p =
class=3D""></o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">I think that proposed in this document =
protection method creates some unpleasant scenario if failure is of a =
node, not a link. If I use the scenario presented in Section 3.6 but =
assume that the failure is not of the link between R_j and R_j+1 but of =
the node Rj+1. Thus, as R_j switches to US direction, the R_j+2 will =
switch to DS. And until notifications from R_j and R_j+2 reach R_j+2 and =
R_j respectively we have routing loop on RL_j+1 LSP.</span><o:p =
class=3D""></o:p></div></div></div></blockquote><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">I appreciate your careful reading! &nbsp;Note of course that =
since there is a TTL, this is a finite loop (not saying it isn=E2=80=99t =
bad, but that this has the germ of the solution.)<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">&nbsp;<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">I have three solutions for this problem. =
I didn=E2=80=99t put them in the first version of the draft; I may =
eventually document all (and others, as the WG chimes in), but meanwhile =
this discussion is perfect.<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">My preferred solution is to always insert packets on a ring =
LSP with TTL =3D 2N-1 if the ring has N nodes. &nbsp;This is enough for =
the worst case =E2=80=94 node R_j sends a packet on RL_j+1 the =
=E2=80=9Clong=E2=80=9D way around, only to encounter a failure at node =
R_j+2, and come all the way back to R_j, then R_j+1.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">&nbsp;<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Another solution is that an ingress node =
sets the TTL as usual, but a PLR sets the TTL to the smaller of the =
current TTL-1 and the minimum TTL required to reach the egress. &nbsp; =
&nbsp;So, in the above example, R_j would set TTL as usual, but R_j+2, =
on detecting a failure, would set TTL =3D N-1 and send it the other way. =
&nbsp;In this case, when the packet gets back to R_j, it should not in =
turn reset the TTL to N-1. &nbsp;Of course, both of the above can be =
combined.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">Finally, a PLR (R_j+2) can push a special purpose label to =
indicate that this is a failure path, then push the label to go the =
other way. &nbsp;If the packet goes back to R_j, before R_j sends it the =
other way, it sees that the label below the top of stack is this failure =
label, and drops the packet rather than cycle it back around the =
ring.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><blockquote style=3D"margin-top: 5pt; =
margin-bottom: 5pt;" class=3D""><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">If my assumptions are =
correct, then notification mechanism MUST be reliable or be backed up by =
IGP signaling. In any case, the loop may persist for quite a while and =
affect all services.</span><o:p =
class=3D""></o:p></div></div></blockquote><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">Agreed, having a reliable notification mechanism is always a =
good thing.<o:p class=3D""></o:p></div></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><br class=3D""><br class=3D""><br class=3D""><o:p =
class=3D""></o:p></div><div class=3D""><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">Comments, questions are =
always welcome and greatly appreciated.</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">&nbsp;<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Greg, since you worked out the problem, =
do you have any opinions on the solutions above, or any of your own?<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">&nbsp;<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Cheers,<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">Kireeti.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><blockquote style=3D"margin-top: 5pt; =
margin-bottom: 5pt;" class=3D""><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Regards,</span><o:p =
class=3D""></o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Greg</span><o:p =
class=3D""></o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">&nbsp;</span><o:p =
class=3D""></o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><b =
class=3D""><span style=3D"font-size: 10pt; font-family: Tahoma, =
sans-serif;" class=3D"">From:</span></b><span style=3D"font-size: 10pt; =
font-family: Tahoma, sans-serif;" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>mpls [<a =
href=3D"mailto:mpls-bounces@ietf.org" style=3D"color: purple; =
text-decoration: underline;" =
class=3D"">mailto:mpls-bounces@ietf.org</a>]<span =
class=3D"Apple-converted-space">&nbsp;</span><b class=3D"">On Behalf =
Of<span class=3D"Apple-converted-space">&nbsp;</span></b>Kireeti =
Kompella<br class=3D""><b class=3D"">Sent:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Wednesday, October 29, 2014 =
10:41 AM<br class=3D""><b class=3D"">To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:mpls@ietf.org" style=3D"color: purple; text-decoration: =
underline;" class=3D"">mpls@ietf.org</a><br class=3D""><b =
class=3D"">Subject:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>[mpls] Fwd: New Version =
Notification for draft-kompella-mpls-rmr-00.txt</span><o:p =
class=3D""></o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">&nbsp;<o:p class=3D""></o:p></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Hi Folks,<o:p class=3D""></o:p></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">This is a draft on making MPLS more efficient in ring =
networks.&nbsp; I have come around to understanding that:<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">a) rings are a special topology (there was a time that I =
didn't appreciate that);<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D"">b) MPLS is pretty =
inefficient in rings (that is/was quite obvious).<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">&nbsp;<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">This draft attempts to fix that, both by =
making protection much more efficient, and by making configuration much =
easier.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">Your comments are highly welcome!<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">&nbsp;<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Cheers,<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">Kireeti.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">&nbsp;<o:p class=3D""></o:p></div><div =
class=3D""><p class=3D"MsoNormal" style=3D"margin: 0in 0in 12pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;">---------- =
Forwarded message ----------<br class=3D"">From: &lt;<a =
href=3D"mailto:internet-drafts@ietf.org" style=3D"color: purple; =
text-decoration: underline;" =
class=3D"">internet-drafts@ietf.org</a>&gt;<br class=3D"">Date: Sun, Oct =
26, 2014 at 9:15 PM<br class=3D"">Subject: New Version Notification for =
draft-kompella-mpls-rmr-00.txt<br class=3D"">To: Kireeti Kompella &lt;<a =
href=3D"mailto:kireeti.kompella@gmail.com" style=3D"color: purple; =
text-decoration: underline;" =
class=3D"">kireeti.kompella@gmail.com</a>&gt;<br class=3D""><br =
class=3D""><br class=3D""><br class=3D"">A new version of I-D, =
draft-kompella-mpls-rmr-00.txt<br class=3D"">has been successfully =
submitted by Kireeti Kompella and posted to the<br class=3D"">IETF =
repository.<br class=3D""><br class=3D"">Name:&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp;draft-kompella-mpls-rmr<br class=3D"">Revision:&nbsp; =
&nbsp; &nbsp; &nbsp;00<br class=3D"">Title:&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; Resilient MPLS Rings<br class=3D"">Document date:&nbsp; =
2014-10-26<br class=3D"">Group:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
Individual Submission<br class=3D"">Pages:&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; 7<br class=3D"">URL:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;<span class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"http://www.ietf.org/internet-drafts/draft-kompella-mpls-rmr-00.txt=
" target=3D"_blank" style=3D"color: purple; text-decoration: underline;" =
class=3D"">http://www.ietf.org/internet-drafts/draft-kompella-mpls-rmr-00.=
txt</a><br class=3D"">Status:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<a =
href=3D"https://datatracker.ietf.org/doc/draft-kompella-mpls-rmr/" =
target=3D"_blank" style=3D"color: purple; text-decoration: underline;" =
class=3D"">https://datatracker.ietf.org/doc/draft-kompella-mpls-rmr/</a><b=
r class=3D"">Htmlized:&nbsp; &nbsp; &nbsp; &nbsp;<a =
href=3D"http://tools.ietf.org/html/draft-kompella-mpls-rmr-00" =
target=3D"_blank" style=3D"color: purple; text-decoration: underline;" =
class=3D"">http://tools.ietf.org/html/draft-kompella-mpls-rmr-00</a><br =
class=3D""><br class=3D""><br class=3D"">Abstract:<br class=3D"">&nbsp; =
&nbsp;This document describes the use of the MPLS control and data =
planes<br class=3D"">&nbsp; &nbsp;on ring topologies.&nbsp; It describes =
the special nature of rings, and<br class=3D"">&nbsp; &nbsp;proceeds to =
show how MPLS can be effectively used in such topologies.<br =
class=3D"">&nbsp; &nbsp;It describes how MPLS rings are configured, =
auto-discovered and<br class=3D"">&nbsp; &nbsp;signaled, as well as how =
the data plane works.&nbsp; Companion documents<br class=3D"">&nbsp; =
&nbsp;describe the details of discovery and signaling for specific<br =
class=3D"">&nbsp; &nbsp;protocols.<br class=3D""><br class=3D""><br =
class=3D""><br class=3D""><br class=3D""><br class=3D"">Please note that =
it may take a couple of minutes from the time of submission<br =
class=3D"">until the htmlized version and diff are available at<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"http://tools.ietf.org/" target=3D"_blank" style=3D"color: =
purple; text-decoration: underline;" class=3D"">tools.ietf.org</a>.<br =
class=3D""><br class=3D"">The IETF Secretariat<o:p =
class=3D""></o:p></p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><br =
class=3D""><br clear=3D"all" class=3D""><o:p class=3D""></o:p></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">--<span class=3D"Apple-converted-space">&nbsp;</span><br =
class=3D"">Kireeti<span =
class=3D"Apple-converted-space">&nbsp;</span></div></div></div></div></blo=
ckquote></div></div></div></blockquote></div></div></div></div></div></blo=
ckquote></div><br class=3D""></div></body></html>=

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From: Kireeti Kompella <kireeti.kompella@gmail.com>
In-Reply-To: <D08ABEC7.12B432%lieven.levrau@alcatel-lucent.com>
Date: Thu, 13 Nov 2014 10:37:14 -1000
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References: <017fdc7b802a41caad7953a5bd73da6d@DB3PR03MB0812.eurprd03.prod.outlook.com> <D08ABEC7.12B432%lieven.levrau@alcatel-lucent.com>
To: "LEVRAU, LIEVEN (LIEVEN)" <lieven.levrau@alcatel-lucent.com>
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Subject: Re: [mpls] draft-kompella-mpls-rmr-00
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On Nov 13, 2014, at 09:04 , LEVRAU, LIEVEN (LIEVEN) =
<lieven.levrau@alcatel-lucent.com> wrote:

>  why is a control plane aspect dictating how the data plane will be =
connection oriented or not?

RSVP-TE usually builds point-to-point tunnels; LDP builds multipoint =
tunnels.

In RMR, I suggest using multipoint tunnels with both LDP and RSVP-TE.

KIreeti.


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">On Nov 13, 2014, at 09:04 , LEVRAU, LIEVEN (LIEVEN) &lt;<a =
href=3D"mailto:lieven.levrau@alcatel-lucent.com" =
class=3D"">lieven.levrau@alcatel-lucent.com</a>&gt; wrote:<div =
class=3D""><br class=3D""><div><blockquote type=3D"cite" class=3D""><div =
class=3D""><div style=3D"font-family: Eurostile, sans-serif; font-size: =
12px; font-style: normal; font-variant: normal; font-weight: normal; =
letter-spacing: normal; line-height: normal; orphans: auto; text-align: =
start; text-indent: 0px; text-transform: none; white-space: normal; =
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D"">&nbsp;why is a control plane aspect dictating how the data =
plane will be connection oriented or not?</div></div></blockquote><br =
class=3D""></div><div>RSVP-TE usually builds point-to-point tunnels; LDP =
builds multipoint tunnels.</div></div><div><br class=3D""></div><div>In =
RMR, I suggest using multipoint tunnels with both LDP and =
RSVP-TE.</div><div><br class=3D""></div><div>KIreeti.</div><div><br =
class=3D""></div></body></html>=

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From: Xuxiaohu <xuxiaohu@huawei.com>
To: Shahram Davari <davari@broadcom.com>, Kireeti Kompella <kireeti.kompella@gmail.com>
Thread-Topic: [mpls] draft-kompella-mpls-rmr-00
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Date: Thu, 13 Nov 2014 20:37:26 +0000
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From: Shahram Davari <davari@broadcom.com>
To: Xuxiaohu <xuxiaohu@huawei.com>, Kireeti Kompella <kireeti.kompella@gmail.com>
Thread-Topic: [mpls] draft-kompella-mpls-rmr-00
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--_000_4A6CE49E6084B141B15C0713B8993F2831D7A7DASJEXCHMB12corpa_--


From nobody Thu Nov 13 12:39:45 2014
Return-Path: <xuxiaohu@huawei.com>
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From: Xuxiaohu <xuxiaohu@huawei.com>
To: Xuxiaohu <xuxiaohu@huawei.com>, Shahram Davari <davari@broadcom.com>, Kireeti Kompella <kireeti.kompella@gmail.com>
Thread-Topic: [mpls] draft-kompella-mpls-rmr-00
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Date: Thu, 13 Nov 2014 20:39:22 +0000
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On Nov 13, 2014, at 09:22 , Loa Andersson <loa@pi.nu> wrote:

> What we said before is that we might do solutions for specific
> topologies if it comes with enough advantages, for shared ring

Not sure what a shared ring is ...

> I believe this is adequately demonstrated and the rmr has a bit to
> go.

Certainly.  Please look for updates.

Kireeti.


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Subject: Re: [mpls] draft-kompella-mpls-rmr-00
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Kireeti,


section 2.5.1.1 and 2.5.1.2 of draft-cheng-mpls-tp-shared-
ring-protection-03 have simple pictures.

/Loa
On 2014-11-13 21:40, Kireeti Kompella wrote:
> On Nov 13, 2014, at 09:22 , Loa Andersson <loa@pi.nu> wrote:
>
>> What we said before is that we might do solutions for specific
>> topologies if it comes with enough advantages, for shared ring
>
> Not sure what a shared ring is ...
>
>> I believe this is adequately demonstrated and the rmr has a bit to
>> go.
>
> Certainly.  Please look for updates.
>
> Kireeti.
>

-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


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From: Xuxiaohu <xuxiaohu@huawei.com>
To: Shahram Davari <davari@broadcom.com>, Kireeti Kompella <kireeti.kompella@gmail.com>
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From: Shahram Davari <davari@broadcom.com>
To: Xuxiaohu <xuxiaohu@huawei.com>
Thread-Topic: [mpls] draft-kompella-mpls-rmr-00
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Date: Thu, 13 Nov 2014 21:03:47 +0000
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References: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE082CCD68@NKGEML512-MBS.china.huawei.com> <7D8D4D1D-554C-472B-9596-380C19F98738@gmail.com> <4A6CE49E6084B141B15C0713B8993F2831D7A69B@SJEXCHMB12.corp.ad.broadcom.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE082CD28C@NKGEML512-MBS.china.huawei.com> <4A6CE49E6084B141B15C0713B8993F2831D7A7DA@SJEXCHMB12.corp.ad.broadcom.com>, <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE082CD30B@NKGEML512-MBS.china.huawei.com>
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Subject: Re: [mpls] draft-kompella-mpls-rmr-00
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<div>And what would be the advantage ?<br>
<br>
Regards,
<div>Shahram</div>
<div><br>
</div>
</div>
<div><br>
On Nov 13, 2014, at 10:53 AM, &quot;Xuxiaohu&quot; &lt;<a href=3D"mailto:xu=
xiaohu@huawei.com">xuxiaohu@huawei.com</a>&gt; wrote:<br>
<br>
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family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">In the cur=
rent rmr draft, yes. However, I wonder whether there is any possibility tha=
t we could still use the per-platform label space.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
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ds,<o:p></o:p></span></p>
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family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Xiaohu<o:p=
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<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:=CB=
=CE=CC=E5">=B7=A2=BC=FE=C8=CB<span lang=3D"EN-US">:</span></span></b><span =
lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:=CB=CE=CC=E5"> Shahram=
 Davari [<a href=3D"mailto:davari@broadcom.com">mailto:davari@broadcom.com<=
/a>]
<br>
</span><b><span style=3D"font-size:10.0pt;font-family:=CB=CE=CC=E5">=B7=A2=
=CB=CD=CA=B1=BC=E4<span lang=3D"EN-US">:</span></span></b><span lang=3D"EN-=
US" style=3D"font-size:10.0pt;font-family:=CB=CE=CC=E5"> 2014</span><span s=
tyle=3D"font-size:10.0pt;font-family:=CB=CE=CC=E5">=C4=EA<span lang=3D"EN-U=
S">11</span>=D4=C2<span lang=3D"EN-US">14</span>=C8=D5<span lang=3D"EN-US">
 4:39<br>
</span><b>=CA=D5=BC=FE=C8=CB<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> Xuxiaohu; Kireeti Kompella<br>
</span><b>=B3=AD=CB=CD<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> <a href=3D"mailto:mpls@ietf.org">
mpls@ietf.org</a><br>
</span><b>=D6=F7=CC=E2<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> RE: [mpls] draft-kompella-mpls-rmr-00<o:p></o:p></span></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Labels are=
 already per-interface.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Thx<br>
SD<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span =
lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&qu=
ot;sans-serif&quot;"> Xuxiaohu [<a href=3D"mailto:xuxiaohu@huawei.com">mail=
to:xuxiaohu@huawei.com</a>]
<br>
<b>Sent:</b> Thursday, November 13, 2014 12:37 PM<br>
<b>To:</b> Shahram Davari; Kireeti Kompella<br>
<b>Cc:</b> <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a><br>
<b>Subject:</b> Re: [mpls] draft-kompella-mpls-rmr-00<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">As I had m=
entioned to kireeti in private, the top label indicating clock-wise or coun=
t-clock-wise forwarding could actually be inferred according
 to the interface via which the packet is arrived. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Best regar=
ds,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Xiaohu<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:=CB=
=CE=CC=E5">=B7=A2=BC=FE=C8=CB<span lang=3D"EN-US">:</span></span></b><span =
lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:=CB=CE=CC=E5"> Shahram=
 Davari [<a href=3D"mailto:davari@broadcom.com">mailto:davari@broadcom.com<=
/a>]
<br>
</span><b><span style=3D"font-size:10.0pt;font-family:=CB=CE=CC=E5">=B7=A2=
=CB=CD=CA=B1=BC=E4<span lang=3D"EN-US">:</span></span></b><span lang=3D"EN-=
US" style=3D"font-size:10.0pt;font-family:=CB=CE=CC=E5"> 2014</span><span s=
tyle=3D"font-size:10.0pt;font-family:=CB=CE=CC=E5">=C4=EA<span lang=3D"EN-U=
S">11</span>=D4=C2<span lang=3D"EN-US">14</span>=C8=D5<span lang=3D"EN-US">
 4:23<br>
</span><b>=CA=D5=BC=FE=C8=CB<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> Kireeti Kompella; Xuxiaohu<br>
</span><b>=B3=AD=CB=CD<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> <a href=3D"mailto:mpls@ietf.org">
mpls@ietf.org</a><br>
</span><b>=D6=F7=CC=E2<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> RE: [mpls] draft-kompella-mpls-rmr-00<o:p></o:p></span></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Kirteeti,<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">A typical =
ring has 8-16 nodes. So there is no point increasing depth of label stack a=
nd modifying forwarding behavior to save 16 labels.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Thx<br>
SD<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span =
lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&qu=
ot;sans-serif&quot;"> mpls [<a href=3D"mailto:mpls-bounces@ietf.org">mailto=
:mpls-bounces@ietf.org</a>]
<b>On Behalf Of </b>Kireeti Kompella<br>
<b>Sent:</b> Thursday, November 13, 2014 12:17 PM<br>
<b>To:</b> Xuxiaohu<br>
<b>Cc:</b> <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a><br>
<b>Subject:</b> Re: [mpls] draft-kompella-mpls-rmr-00<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi Xiaohu,<o:p></o:p></span></p=
>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">On Nov 12, 2014, at 11:33 , Xux=
iaohu &lt;<a href=3D"mailto:xuxiaohu@huawei.com">xuxiaohu@huawei.com</a>&gt=
; wrote:<o:p></o:p></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:5.0pt;margin-right:36.0p=
t;margin-bottom:0cm;margin-left:36.0pt;margin-bottom:.0001pt;text-align:jus=
tify;text-justify:inter-ideograph">
<span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&qu=
ot;,&quot;sans-serif&quot;">Hi Kireeti,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:36.0pt;=
margin-bottom:0cm;margin-left:36.0pt;margin-bottom:.0001pt;text-align:justi=
fy;text-justify:inter-ideograph">
<span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&qu=
ot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:36.0pt;=
margin-bottom:5.0pt;margin-left:36.0pt;text-align:justify;text-justify:inte=
r-ideograph">
<span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&qu=
ot;,&quot;sans-serif&quot;">I have read your draft and found it=A1=AFs very=
 interesting.<o:p></o:p></span></p>
</blockquote>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Thank you!<o:p></o:p></span></p=
>
</div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span lang=3D"EN-US">=
<o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Cali=
bri&quot;,&quot;sans-serif&quot;">I wonder whether it=A1=AFs possible to in=
troduce the idea of the RPR (Resilient Packet Ring) technology into
 the MPLS-enabled ring networks. For instance, for a given node on a ring, =
it has two types of interfaces, one is ring-interface and the other is non-=
ring-interface. In addition, the ring-interface is either eastward or westw=
ard. When receiving an MPLS packet
 from a non-ring interface, if the next-hop of that MPLS packet is one of i=
ts adjacent peers on the ring, it would impose a label indicating clock-wis=
e forwarding or count-clock-wise forwarding accordingly. When receiving an =
MPLS packet with the top label being
 the label indicating clock-wise or counter-clock-wise forwarding, unless t=
he next-hop of the FEC which is indicated by the label below that top label=
 is itself or a peer which is connected via a non-ring interface (i.e., the=
 packet would pop off the ring),
 that packet should be forwarding according to the top label, e.g., if the =
top label indicates clock-wise forwarding, it would be forwarded in the clo=
ck-wise direction.<span class=3D"apple-converted-space">&nbsp;</span><o:p><=
/o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Cali=
bri&quot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Cali=
bri&quot;,&quot;sans-serif&quot;">The label indicating clock-wise or count-=
clock-wise forwarding could be an SPL or a local label which
 is advertised by each ring node. If that label is a local label, it should=
 be swapped accordingly on each hop of the ring. When the packet received f=
rom a adjacent peer on the ring should pop off that ring, the top label ind=
icating clock-wise or count-clock-wise
 forwarding should be stripped before performing the further MPLS forwardin=
g process.<o:p></o:p></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Good comment. &nbsp;Let me see =
if I understand. &nbsp;Let=A1=AFs say that the ring has N nodes. &nbsp;The =
way I would do this, each node has 2*(N-1) labels to reach each of the othe=
r (N-1) nodes in the two directions (CW or CCW).<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">What you are suggesting is to h=
ave a two-label stack; the outer label says CW or CCW; the inner label says=
 what the egress ring node is. &nbsp;So, each node has (N-1) inner labels.<=
o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">So, you are optimizing 2*(N-1) =
to (N-1) by using hierarchy. &nbsp;Is N large enough to make this worthwhil=
e?<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US">Note that &quot;</span><span lang=3D"EN-US" styl=
e=3D"font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot=
;">unless the next-hop of the FEC which is indicated by the label below
 that top label is itself</span><span lang=3D"EN-US" style=3D"font-family:&=
quot;Calibri&quot;,&quot;sans-serif&quot;">=A1=B1</span><span lang=3D"EN-US=
" style=3D"font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-seri=
f&quot;">&nbsp;</span><span lang=3D"EN-US">is a non-trivial forwarding step=
. &nbsp;I.e., each node
 needs to look at two labels to determine how to forward the packet.<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US">However, to reach non-ring nodes, I fully suppor=
t using hierarchy.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US">Cheers,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US">Kireeti.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:5.0pt;margin-right:36.0p=
t;margin-bottom:0cm;margin-left:36.0pt;margin-bottom:.0001pt;text-align:jus=
tify;text-justify:inter-ideograph">
<span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&qu=
ot;,&quot;sans-serif&quot;">Best regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:36.0pt;=
margin-bottom:5.0pt;margin-left:36.0pt;text-align:justify;text-justify:inte=
r-ideograph">
<span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&qu=
ot;,&quot;sans-serif&quot;">Xiaohu<o:p></o:p></span></p>
</blockquote>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
</div>
</div>
</blockquote>
</body>
</html>

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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: Shahram Davari <davari@broadcom.com>, Kireeti Kompella <kireeti.kompella@gmail.com>, Xuxiaohu <xuxiaohu@huawei.com>
Thread-Topic: [mpls] draft-kompella-mpls-rmr-00
Thread-Index: AQHP/4Z9NhLCDCTzRbWTojN86D41Fg==
Date: Thu, 13 Nov 2014 21:12:11 +0000
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
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--_000_651744a31846434daa881e7fa5af085bDB3PR03MB0812eurprd03pr_--


From nobody Thu Nov 13 13:20:11 2014
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From: Kireeti Kompella <kireeti.kompella@gmail.com>
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Hi Huub,

On Nov 13, 2014, at 05:56 , Huub van Helvoort <huubatwork@gmail.com> =
wrote:

> Hello Kireeti,
>=20
> See my response in-line [hh]
>>> I also did a careful reading of this draft.
>>>=20
>>> I agree with Greg that the failure of a node is not covered.
>>=20
>> My aim is to treat link and node failures the same way.
> > I don=E2=80=99t see much difference in how one would respond,
> > but I=E2=80=99m happy to listen to other opinions.
>=20
> [hh] If I understand the draft well enough: node J detects
> failure of the link JK between node J and K (whether that is
> due to link JK failure or node K failure does not matter).

I=E2=80=99m assuming that J->K is US.

> Node J switches traffic from US to DS and sens a message DS to
> node K (unaware of the possibility that node K has failed).

Two points here:

a) Node J sends a message to its DS neighbor, not to node K.  This means =
that traffic switches from US to DS one hop closer to the ingress.  One =
might want to send the notification to the ingress, but since ring LSPs =
are multipoint, you really don=E2=80=99t know who the ingress is.

b) for all ring LSPs except the one with node K as egress, the =
protection action of switching traffic from US to DS works, independent =
of whether the link JK or the node K failed.  In the case of the ring =
LSP to node K, nothing can really be done, unless the real destination =
is dual-homed (separate topic).

> Node L receives the message, but cannot forward it to the
> failed node K.

Not sure why you want to send the notification to node K.

KIreeti.

> What happens in this case?
>=20
>>> I also notice that you did not cover that a second failure
>>> (link/node) that splits the ring in two islands.
>>> In this case the protection in effect in each of the islands
>>> should be maintained. You may have the same issue as detected
>>> by Greg for a single node failure.
>>=20
>> Understood.
>=20
> [hh] OK.
>=20
>>> I also notice that during the process of changing DS to US
>>> at each node MPLS packets may get lost or get out of order.
>>> Is my interpretation correct?
>>=20
>> That is correct.  I think that is the case for all protection
> > schemes; certainly for MPLS protection schemes.
>=20
> [hh] what is described in your draft I would call "steering"
> at the ingress node.
> draft-cheng-mpls-tp-shared-ring-protection used "wrapping"
> Wrapping has the advantage that packets are lost only during
> the defect detection time.
> Steering has additional time, the switch times at every node
> between the node detecting the failure until the DS message
> reaches the ingress node.
>=20
> Cheers, Huub.
>=20
> --=20
> *****************************************************************
>              =
=E8=AF=B7=E8=AE=B0=E4=BD=8F=EF=BC=8C=E4=BD=A0=E6=98=AF=E7=8B=AC=E4=B8=80=E6=
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>=20
> _______________________________________________
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From nobody Thu Nov 13 13:27:09 2014
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From: Shahram Davari <davari@broadcom.com>
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, Xuxiaohu <xuxiaohu@huawei.com>
Thread-Topic: [mpls] draft-kompella-mpls-rmr-00
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Subject: Re: [mpls] draft-kompella-mpls-rmr-00
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Hi Huub,

On Nov 13, 2014, at 05:56 , Huub van Helvoort <huubatwork@gmail.com> =
wrote:

> [hh] what is described in your draft I would call "steering"
> at the ingress node.
> draft-cheng-mpls-tp-shared-ring-protection used "wrapping"
> Wrapping has the advantage that packets are lost only during
> the defect detection time.
> Steering has additional time, the switch times at every node
> between the node detecting the failure until the DS message
> reaches the ingress node.

Not sure what you mean.  The goal in what I=E2=80=99m doing (call it =
what you will) is to minimize packet loss to detection time.  The node =
detecting the failure switches traffic as soon as it realizes that the =
next {link, node} has failed.

The fact that other nodes can short-circuit the protection path is an =
optimization.

Kireeti.


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Hello Sasha,

You wrote:

> A typical ring has 8-16 nodes?

Indeed, smaller number in the access, larger number in the core of
the network.

> Indeed, SONET/ SDH rings with BLSR/MS-SPRing are limited to 16 nodes
> because there are just 4 bits to encode the Node ID in K1/K2 overhead bytes.

There are "just" four bits after careful consideration.
The network objective is to switch within 50 ms.
In the 16 node ring the propagation delay around the ring has to be
taken into account and the processing time of the K1/K2 bytes.

> An MPLS ring could have more if needed.

Of course. However this number will be determined by the propagation
delay and the processing time per node.

> My guess is that the limit on the number of nodes in a ring is limited
> only by the probability of a double link/node failure. If failures are
> rare and repair is fast, you could have more nodes in a ring, if the
> failures are frequent and repair is slow, ring topologies become
> problematic even if the number of nodes is small.
>
> On the other hand, "up to 16 nodes in a ring" has probably become yet
> one more magic number/an article of faith as, say, "sub-50 milliseconds
> protection switch": Most people do not even ask whence it has come from,
> what exactly it means and why (if at all) it is still relevant...

See above. Note that the extraction, insertion and validation of
the K1/K2 bytes requires 0.6 ms per node.

Regards, Huub.


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Hello Kireeti,

You replied:

See my response in-line [hh2]

>>>> I also did a careful reading of this draft.
>>>>
>>>> I agree with Greg that the failure of a node is not covered.
>>>
>>> My aim is to treat link and node failures the same way.
>>> I don’t see much difference in how one would respond,
>>> but I’m happy to listen to other opinions.
>>
>> [hh] If I understand the draft well enough: node J detects
>> failure of the link JK between node J and K (whether that is
>> due to link JK failure or node K failure does not matter).
>
> I’m assuming that J->K is US.

[hh2] yes, that is correct.

>> Node J switches traffic from US to DS and sens a message DS to
>> node K (unaware of the possibility that node K has failed).
>
> Two points here:
>
> a) Node J sends a message to its DS neighbor, not to node K.
 >  This means that traffic switches from US to DS one hop
 > closer to the ingress.
 > One might want to send the notification to the ingress,
 > but since ring LSPs are multipoint, you really don’t know
 > who the ingress is.

[hh2] OK, that was not clear to me when I read the draft.

[hh2] Can I conclude that the sending of messages to DS
neighbors stops as soon as the ingress node is reached?

> b) for all ring LSPs except the one with node K as egress,
 > the protection action of switching traffic from US to DS
 > works, independent of whether the link JK or the node
 > K failed.

[hh2] if my conclusion above is correct, then I agree.

> In the case of the ring LSP to node K, nothing can
 > really be done, unless the real destination is
 > dual-homed (separate topic).

[hh2] OK, I would refer to that as drop-and-continue
because there can be more than two nodes involved.

>> Node L receives the message, but cannot forward it to the
>> failed node K.
>
> Not sure why you want to send the notification to node K.

[hh2] if my conclusion above is correct, then forget
this comment.

Cheers, Huub.



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Subject: Re: [mpls] New Version Notification for draft-kompella-mpls-rmr-00.txt
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Hello Kireeti,

You reply:

>> [hh] what is described in your draft I would call "steering"
>> at the ingress node.
>> draft-cheng-mpls-tp-shared-ring-protection used "wrapping"
>> Wrapping has the advantage that packets are lost only during
>> the defect detection time.
>> Steering has additional time, the switch times at every node
>> between the node detecting the failure until the DS message
>> reaches the ingress node.
>
> Not sure what you mean. The goal in what I’m doing (call it
 > what you will) is to minimize packet loss to detection time.

[hh] OK, I see.

> The node detecting the failure switches traffic as soon as
 > it realizes that the next {link, node} has failed.
>
> The fact that other nodes can short-circuit the protection
 > path is an optimization.

[hh] this was not clear to me after reading the draft.
So you are initially also using wrapping. This is similar
to draft-cheng-mpls-tp-shared-ring-protection

Cheers, Huub.


-- 
*****************************************************************
               请记住，你是独一无二的，就像其他每一个人一样


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Subject: [mpls] I-D Action: draft-ietf-mpls-mldp-node-protection-02.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Multiprotocol Label Switching Working Group of the IETF.

        Title           : mLDP Node Protection
        Authors         : IJsbrand Wijnands
                          Eric Rosen
                          Kamran Raza
                          Jeff Tantsura
                          Alia Atlas
                          Quintin Zhao
	Filename        : draft-ietf-mpls-mldp-node-protection-02.txt
	Pages           : 16
	Date            : 2014-11-13

Abstract:
   This document describes procedures to support node protection for
   Point-to-Multipoint and Multipoint-to-Multipoint Label Switched Paths
   (MP LSPs) built by LDP ("Label Distribution Protocol"), or simply
   mLDP.  In order to protect a node N, the Point of Local Repair (PLR)
   LSR of N must learn the Merge Point (MPT) LSR(s) of node N such that
   traffic can be redirected to them in case node N fails.  Redirecting
   the traffic around the failed node N depends on existing P2P LSPs
   originated from the PLR LSR to the MPT LSRs while bypassing LSR node
   N.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-mldp-node-protection/

There's also a htmlized version available at:
http://tools.ietf.org/html/draft-ietf-mpls-mldp-node-protection-02

A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-mldp-node-protection-02


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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From nobody Fri Nov 14 06:10:35 2014
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Subject: [mpls] I-D Action: draft-ietf-mpls-lsp-ping-relay-reply-05.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Multiprotocol Label Switching Working Group of the IETF.

        Title           : Relayed Echo Reply mechanism for LSP Ping
        Authors         : Jian Luo
                          Lizhong Jin
                          Thomas Nadeau
                          George Swallow
	Filename        : draft-ietf-mpls-lsp-ping-relay-reply-05.txt
	Pages           : 15
	Date            : 2014-11-14

Abstract:
   In some inter autonomous system (AS) and inter-area deployment
   scenarios for RFC 4379 "Label Switched Path (LSP) Ping and
   Traceroute", a replying LSR may not have the available route to the
   initiator, and the Echo Reply message sent to the initiator would be
   discarded resulting in false negatives or complete failure of
   operation of LSP Ping and Traceroute.  This document describes
   extensions to LSP Ping mechanism to enable the replying Label
   Switching Router (LSR) to have the capability to relay the Echo
   Response by a set of routable intermediate nodes to the initiator.
   This document updates RFC 4379.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-lsp-ping-relay-reply/

There's also a htmlized version available at:
http://tools.ietf.org/html/draft-ietf-mpls-lsp-ping-relay-reply-05

A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-lsp-ping-relay-reply-05


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


From nobody Fri Nov 14 11:30:16 2014
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From: Kireeti Kompella <kireeti.kompella@gmail.com>
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Hi Huub,

On Nov 13, 2014, at 12:59 , Huub van Helvoort <huubatwork@gmail.com> =
wrote:

> [hh2] OK, that was not clear to me when I read the draft.

Clearly, a number of clarifications and details are needed.  Watch this =
space for updates :)

> [hh2] Can I conclude that the sending of messages to DS
> neighbors stops as soon as the ingress node is reached?

Yes and no.  Yes for the traffic from that node.  However, since the =
ring LSP is multipoint, the nodes further DS can also initiate traffic.  =
So, effectively, the notifications have to go all the way to the ring =
LSP=E2=80=99s anchor node.

>> In the case of the ring LSP to node K, nothing can
> > really be done, unless the real destination is
> > dual-homed (separate topic).
>=20
> [hh2] OK, I would refer to that as drop-and-continue
> because there can be more than two nodes involved.

Indeed.

>>> Node L receives the message, but cannot forward it to the
>>> failed node K.
>>=20
>> Not sure why you want to send the notification to node K.
>=20
> [hh2] if my conclusion above is correct, then forget
> this comment.

No, you are correct in that (as I said above) every node till the ring =
LSP anchor needs to know, including node K.  However, one can=E2=80=99t =
just send a notification to node K =E2=80=94 all nodes DS of the fault =
need to know this.

Cheers,
Kireeti.


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From: Kireeti Kompella <kireeti.kompella@gmail.com>
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Subject: Re: [mpls] New Version Notification for draft-kompella-mpls-rmr-00.txt
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Hi Dongjie, Huub:

On Nov 13, 2014, at 19:03 , Dongjie (Jimmy) <jie.dong@huawei.com> wrote:

> I guess the specified protection is to use wrapping in the beginning =
to minimize packet loss, when other nodes know the failure, they can =
switch to shorter paths (i.e. steering) for optimization.=20

Yes, that would be a good characterization.

Cheers,
Kireeti.


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Subject: [mpls] RFC 7394 on Definition of Time to Live TLV for LSP-Ping Mechanisms
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A new Request for Comments is now available in online RFC libraries.

        
        RFC 7394

        Title:      Definition of Time to Live 
                    TLV for LSP-Ping Mechanisms 
        Author:     S. Boutros, S. Sivabalan,
                    G. Swallow, S. Saxena,
                    V. Manral, S. Aldrin
        Status:     Standards Track
        Stream:     IETF
        Date:       November 2014
        Mailbox:    sboutros@cisco.com, 
                    msiva@cisco.com, 
                    swallow@cisco.com, 
                    ssaxena@cisco.com, 
                    vishwas@ionosnetworks.com, 
                    aldrin.ietf@gmail.com
        Pages:      8
        Characters: 15120
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-mpls-lsp-ping-ttl-tlv-10.txt

        URL:        https://www.rfc-editor.org/rfc/rfc7394.txt

LSP-Ping is a widely deployed Operation, Administration, and
Maintenance (OAM) mechanism in MPLS networks.  However, in the present
form, this mechanism is inadequate to verify connectivity of a
segment of a Multi-Segment Pseudowire (MS-PW) and/or bidirectional
co-routed Label Switched Path (LSP) from any node on the path of the MS-PW 
and/or bidirectional co-routed LSP.  This document defines a TLV to address
this shortcoming.

This document is a product of the Multiprotocol Label Switching Working Group of the IETF.

This is now a Proposed Standard.

STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements.  Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the 
standardization state and status of this protocol.  Distribution of this 
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Loa Andersson (loa@pi.nu)" <loa@pi.nu>, "swallow@cisco.com" <swallow@cisco.com>, "Ross Callon (rcallon@juniper.net)" <rcallon@juniper.net>
Thread-Topic: LDP Entity Table in RFC 3815
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Subject: [mpls] LDP Entity Table in RFC 3815
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Loa, George, Ross and all hi,
I apologize in advance for a possibly na=EFve question, but I have, so far,=
 failed to understand what is represented by individual entries in the LDP =
Entity  Table in RFC 3815.

One possible interpretation is that  a given node and for a given LDP Ident=
ifier, would typically support up to two entries in the table:

=B7         One entry would be responsible for all direct sessions (and hen=
ce the value of Targeted Peer in this entry would be set to False)

=B7         Another entry would be responsible for all targeted sessions (w=
ith the value of Targeted Peer set to True)

=B7         Each entry would be explicitly created by a suitable management=
 operation (using the Row Status)

=B7         Multiple peers (each with its own sessions) would be associated=
 with each entity (as suggested by indexing  for the LDP Peer Table).

Yet another possible interpretation is that a separate LDP Entity could be =
created for each interface on which LDP is enabled. This is suggested by th=
e statement in description of mplsLdpEntityIndex that says that ifIndex (pr=
esumably of an interface on which LDP has been enabled) may be used as the =
LDP Entity Index.  This interpretation does not contradict the previous one=
, because it could refer to "real" interfaces for direct sessions and to lo=
opback interfaces for targeted sessions. This interpretation would also fac=
ilitate adding/removing LDP-enabled interface to/from a node. However, this=
 interpretation does not sit well with the definition of the next free inde=
x for the LDP Entity table.

However, neither of these interpretations looks compatible with the followi=
ng text from the definition of Admin Status of the LDP Entity Table entry:

             If this object is changed from 'enable' to 'disable'
             and this entity has already attempted to establish
             contact with a Peer, then all contact with that
             Peer is lost and all information from that Peer
             needs to be removed from the MIB.

The fact that "Peer" (highlighted in this text) appears in singular strongl=
y suggests that a single entry in the LDP Entity table corresponds to at mo=
st one peer.

Any clarifications on the subject would be highly appreciated.

Regards, and lots of thanks in advance,
Sasha




Regards,
       Sasha
Email: Alexander.Vainshtein@ecitele.com
Mobile: 054-9266302


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<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
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</head>
<body lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Loa, George, Ross and all hi,<o:p></o:p></p>
<p class=3D"MsoNormal">I apologize in advance for a possibly na=EFve questi=
on, but I have, so far, failed to understand what is represented by individ=
ual entries in the LDP Entity &nbsp;Table in RFC 3815.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">One possible interpretation is that &nbsp;a given no=
de and for a given LDP Identifier, would typically support up to two entrie=
s in the table:<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo1"><![if !supportLists]><span style=3D"font-family:Symbol"><span styl=
e=3D"mso-list:Ignore">=B7<span style=3D"font:7.0pt &quot;Times New Roman&qu=
ot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span>One entry would be =
responsible for all direct sessions (and hence the value of Targeted Peer i=
n this entry would be set to False)<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo1"><![if !supportLists]><span style=3D"font-family:Symbol"><span styl=
e=3D"mso-list:Ignore">=B7<span style=3D"font:7.0pt &quot;Times New Roman&qu=
ot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span>Another entry would=
 be responsible for all targeted sessions (with the value of Targeted Peer =
set to True)<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo1"><![if !supportLists]><span style=3D"font-family:Symbol"><span styl=
e=3D"mso-list:Ignore">=B7<span style=3D"font:7.0pt &quot;Times New Roman&qu=
ot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span>Each entry would be=
 explicitly created by a suitable management operation (using the Row Statu=
s)<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo1"><![if !supportLists]><span style=3D"font-family:Symbol"><span styl=
e=3D"mso-list:Ignore">=B7<span style=3D"font:7.0pt &quot;Times New Roman&qu=
ot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span>Multiple peers (eac=
h with its own sessions) would be associated with each entity (as suggested=
 by indexing &nbsp;for the LDP Peer Table).<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Yet another possible interpretation is that a separa=
te LDP Entity could be created for each interface on which LDP is enabled. =
This is suggested by the statement in description of mplsLdpEntityIndex tha=
t says that ifIndex (presumably of
 an interface on which LDP has been enabled) may be used as the LDP Entity =
Index. &nbsp;This interpretation does not contradict the previous one, beca=
use it could refer to &#8220;real&#8221; interfaces for direct sessions and=
 to loopback interfaces for targeted sessions. This
 interpretation would also facilitate adding/removing LDP-enabled interface=
 to/from a node. However, this interpretation does not sit well with the de=
finition of the next free index for the LDP Entity table.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">However, neither of these interpretations looks comp=
atible with the following text from the definition of Admin Status of the L=
DP Entity Table entry:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; If this object is changed from 'enable' to 'disa=
ble'<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; and this entity has already attempted to establi=
sh<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; contact with
<span style=3D"background:yellow;mso-highlight:yellow">a Peer</span>, then =
all contact with that<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;
<span style=3D"background:yellow;mso-highlight:yellow">Peer</span> is lost =
and all information from that Peer<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; needs to be removed from the MIB.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The fact that &#8220;<span style=3D"background:yello=
w;mso-highlight:yellow">Peer</span>&#8221; (highlighted in this text) appea=
rs in
<span style=3D"background:yellow;mso-highlight:yellow">singular</span> stro=
ngly suggests that a single entry in the LDP Entity table corresponds to at=
 most one peer.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Any clarifications on the subject would be highly ap=
preciated.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p></=
p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards,<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Sasha <o:p></o:=
p></p>
<p class=3D"MsoNormal">Email: Alexander.Vainshtein@ecitele.com<o:p></o:p></=
p>
<p class=3D"MsoNormal">Mobile: 054-9266302<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</body>
</html>

--_000_5e9f4ce48e1c47e5ac73f9e7ca122dd1DB3PR03MB0812eurprd03pr_--


From nobody Tue Nov 18 01:30:10 2014
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From: Mach Chen <mach.chen@huawei.com>
To: "draft-atlas-mpls-ldp-mrt@tools.ietf.org" <draft-atlas-mpls-ldp-mrt@tools.ietf.org>
Thread-Topic: MPLS-RT review of draft-atlas-mpls-ldp-mrt
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Subject: [mpls] MPLS-RT review of draft-atlas-mpls-ldp-mrt
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Hi Authors,

I am assigned as a MPLS-RT reviewer of draft-atlas-mpls-ldp-mrt.=20

The draft is well written and ready for a call adoption. I have two comment=
s as below:

1.

It's better to expand the acronyms (e.g., MRT, LDP, etc.) in the first usag=
e.

2.

"4.1.  MRT Capability Advertisement
It is not possible to support MRT without supporting the LDP multi-
   topology extensions, but it is possible that the only use of the
   multi-topology extensions is for MRT.  In that case, a router MAY not
   negotiate the multi-topology capability and only negotiate the MRT
   Capability with its LDP peers.  Negotiation of the multi-topology
   capability is not required with negotiation of the MRT capability."

Personally, I'd like that the MRT capability does not coupled with MT capab=
ility. This may bring extra logic/complex to the implementation. Suppose th=
at an LSR advertises the MRT capability to its neighbors and then withdraw =
it later, then the receiver LSRs have to determine whether withdraw the MT =
capability as well. More seriously, for the MT capability negotiation proce=
ss, since it does not know whether there is MRT, so when an LSR receives an=
 MT withdraw, how it handles its MT capability?=20

Best regards,
Mach


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Subject: Re: [mpls] MPLS-RT review of draft-atlas-mpls-ldp-mrt-02.txt
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Dear Authors, MPLS WG chairs, et. al,
I've been asked to review the draft-atlas-mpls-ldp-mrt-02.txt.

The document is very well written, technically sound and clearly addresses =
integral part of MRT-FRR solution.
It is ready for the WG adoption in my opinion.

Below are my comments to authors that are should not be viewed as gating th=
e adoption:
*       section 4.1, I'd consider padding the MRT Capability TLV with extra=
 3 octets and changing the Length field accordingly to 4;
*       section 4.3, a bit strange that IANA request to allocate MT-IDs for=
 MRT-Red and MRT-Blue is in ietf-rtgwg-mrt-frr-architecture and not in this=
 document as for Rainbow-MRT's MT-ID (section 4.2). Perhaps by grouping all=
 in one request would make it logistically easier and minimize inter-depend=
ency of the MRT-FRR documents.

Thank you for your kind consideration.

        Regards,
                Greg

-----Original Message-----
From: Loa Andersson [mailto:loa@pi.nu]
Sent: Tuesday, October 28, 2014 4:26 AM
To: Mach Chen; stbryant@cisco.com; Gregory Mirsky
Cc: mpls-chairs@tools.ietf.org; VIGOUREUX, MARTIN (MARTIN); draft-atlas-mpl=
s-ldp-mrt@tools.ietf.org
Subject: MPLS-RT review of draft-atlas-mpls-ldp-mrt-02.txt

Mach, Stewart and Greg,

You have be selected as MPLS-RT reviewers for  draft-atlas-mpls-ldp-mrt.

Note to authors: You have been CC'd on this email so that you can know that=
 this review is going on. However, please do not review your own document.

Reviews should comment on whether the document is coherent, is it useful (i=
e, is it likely to be actually useful in operational networks), and is the =
document technically sound?  We are interested in knowing whether the docum=
ent is ready to be considered for WG adoption (ie, it doesn't have to be pe=
rfect at this point, but should be a good start).

Reviews should be sent to the document authors, WG co-chairs and WG secreta=
ry, and CC'd to the MPLS WG email list. If necessary, comments may be sent =
privately to only the WG chairs.

If you have technical comments you should try to be explicit about what
*really* need to be resolved before adopting it as a working group document=
, and what can wait until the document is a working group document and the =
working group has the revision control.

Are you able to review this draft by Nov 18, 2014? Please respond in a time=
ly fashion.


Thanks, Loa
(as MPLS WG chair)


-------- Original Message --------
Subject: [mpls] I-D Action: draft-atlas-mpls-ldp-mrt-02.txt
Date: Mon, 27 Oct 2014 09:09:38 -0700
From: internet-drafts@ietf.org<mailto:internet-drafts@ietf.org>
To: i-d-announce@ietf.org<mailto:i-d-announce@ietf.org>
CC: mpls@ietf.org<mailto:mpls@ietf.org>


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
  This draft is a work item of the Multiprotocol Label Switching Working Gr=
oup of the IETF.

         Title           : LDP Extensions to Support Maximally Redundant
Trees
         Authors         : Alia Atlas
                           Kishore Tiruveedhula
                           Chris Bowers
                           Jeff Tantsura
                           IJsbrand Wijnands
        Filename        : draft-atlas-mpls-ldp-mrt-02.txt
        Pages           : 16
        Date            : 2014-10-27

Abstract:
    This document specifies extensions to LDP to support the creation of
    label-switched paths for Maximally Redundant Trees (MRT).  A prime
    use of MRTs is for unicast and multicast IP/LDP Fast-Reroute, which
    we will refer to as MRT-FRR.

    The sole protocol extension to LDP is simply the ability to advertise
    an MRT Capability.  This document describes that extension and the
    associated behavior expected for LSRs and LERs advertising the MRT
    Capability.

    MRT-FRR uses LDP multi-topology extensions and requires three
    different multi-topology IDs to be allocated from the LDP MT-ID
    space.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-atlas-mpls-ldp-mrt/

There's also a htmlized version available at:
http://tools.ietf.org/html/draft-atlas-mpls-ldp-mrt-02

A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=3Ddraft-atlas-mpls-ldp-mrt-02


Please note that it may take a couple of minutes from the time of submissio=
n until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

_______________________________________________
mpls mailing list
mpls@ietf.org<mailto:mpls@ietf.org>
https://www.ietf.org/mailman/listinfo/mpls




--_000_7347100B5761DC41A166AC17F22DF1121B89337Aeusaamb103erics_
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<font face=3D"Calibri" size=3D"2"><span style=3D"font-size:11pt;">
<div>Dear Authors, MPLS WG chairs, et. al,</div>
<div>I've been asked to review the draft-atlas-mpls-ldp-mrt-02.txt.</div>
<div>&nbsp;</div>
<div>The document is very well written, technically sound and clearly addre=
sses integral part of MRT-FRR solution.</div>
<div>It is ready for the WG adoption in my opinion.</div>
<div>&nbsp;</div>
<div>Below are my comments to authors that are should not be viewed as gati=
ng the adoption:</div>
<ul style=3D"margin:0;padding-left:36pt;">
<li>section 4.1, I'd consider padding the MRT Capability TLV with extra 3 o=
ctets and changing the Length field accordingly to 4;</li><li>section 4.3, =
a bit strange that IANA request to allocate MT-IDs for MRT-Red and MRT-Blue=
 is in ietf-rtgwg-mrt-frr-architecture and not in this document as for Rain=
bow-MRT&#8217;s MT-ID (section 4.2). Perhaps by grouping all in one request=
 would make it logistically
easier and minimize inter-dependency of the MRT-FRR documents.</li></ul>
<div>&nbsp;</div>
<div>Thank you for your kind consideration.</div>
<div>&nbsp;</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Regards,</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp; Greg</div>
<div>&nbsp;</div>
<div>-----Original Message-----<br>

From: Loa Andersson [<a href=3D"mailto:loa@pi.nu">mailto:loa@pi.nu</a>] <br=
>

Sent: Tuesday, October 28, 2014 4:26 AM<br>

To: Mach Chen; stbryant@cisco.com; Gregory Mirsky<br>

Cc: mpls-chairs@tools.ietf.org; VIGOUREUX, MARTIN (MARTIN); draft-atlas-mpl=
s-ldp-mrt@tools.ietf.org<br>

Subject: MPLS-RT review of draft-atlas-mpls-ldp-mrt-02.txt</div>
<div>&nbsp;</div>
<div>Mach, Stewart and Greg,</div>
<div>&nbsp;</div>
<div>You have be selected as MPLS-RT reviewers for&nbsp; draft-atlas-mpls-l=
dp-mrt.</div>
<div>&nbsp;</div>
<div>Note to authors: You have been CC'd on this email so that you can know=
 that this review is going on. However, please do not review your own docum=
ent.</div>
<div>&nbsp;</div>
<div>Reviews should comment on whether the document is coherent, is it usef=
ul (ie, is it likely to be actually useful in operational networks), and is=
 the document technically sound?&nbsp; We are interested in knowing whether=
 the document is ready to be considered
for WG adoption (ie, it doesn't have to be perfect at this point, but shoul=
d be a good start).</div>
<div>&nbsp;</div>
<div>Reviews should be sent to the document authors, WG co-chairs and WG se=
cretary, and CC'd to the MPLS WG email list. If necessary, comments may be =
sent privately to only the WG chairs.</div>
<div>&nbsp;</div>
<div>If you have technical comments you should try to be explicit about wha=
t</div>
<div>*really* need to be resolved before adopting it as a working group doc=
ument, and what can wait until the document is a working group document and=
 the working group has the revision control.</div>
<div>&nbsp;</div>
<div>Are you able to review this draft by Nov 18, 2014? Please respond in a=
 timely fashion.</div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>Thanks, Loa</div>
<div>(as MPLS WG chair)</div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>-------- Original Message --------</div>
<div>Subject: [mpls] I-D Action: draft-atlas-mpls-ldp-mrt-02.txt</div>
<div>Date: Mon, 27 Oct 2014 09:09:38 -0700</div>
<div>From: <a href=3D"mailto:internet-drafts@ietf.org">internet-drafts@ietf=
.org</a></div>
<div>To: <a href=3D"mailto:i-d-announce@ietf.org">i-d-announce@ietf.org</a>=
</div>
<div>CC: <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a></div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>A New Internet-Draft is available from the on-line Internet-Drafts dir=
ectories.</div>
<div>&nbsp; This draft is a work item of the Multiprotocol Label Switching =
Working Group of the IETF.</div>
<div>&nbsp;</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Title&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : LDP Extensions to Support Ma=
ximally Redundant </div>
<div>Trees</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Authors&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : Alia Atlas</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp; Kishore Tiruveedhula</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp; Chris Bowers</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp; Jeff Tantsura</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp; IJsbrand Wijnands</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Filename&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp; : draft-atlas-mpls-ldp-mrt-02.txt</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Pages&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : 16</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Date&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : 2014-10-27</div>
<div>&nbsp;</div>
<div>Abstract:</div>
<div>&nbsp;&nbsp;&nbsp; This document specifies extensions to LDP to suppor=
t the creation of</div>
<div>&nbsp;&nbsp;&nbsp; label-switched paths for Maximally Redundant Trees =
(MRT).&nbsp; A prime</div>
<div>&nbsp;&nbsp;&nbsp; use of MRTs is for unicast and multicast IP/LDP Fas=
t-Reroute, which</div>
<div>&nbsp;&nbsp;&nbsp; we will refer to as MRT-FRR.</div>
<div>&nbsp;</div>
<div>&nbsp;&nbsp;&nbsp; The sole protocol extension to LDP is simply the ab=
ility to advertise</div>
<div>&nbsp;&nbsp;&nbsp; an MRT Capability.&nbsp; This document describes th=
at extension and the</div>
<div>&nbsp;&nbsp;&nbsp; associated behavior expected for LSRs and LERs adve=
rtising the MRT</div>
<div>&nbsp;&nbsp;&nbsp; Capability.</div>
<div>&nbsp;</div>
<div>&nbsp;&nbsp;&nbsp; MRT-FRR uses LDP multi-topology extensions and requ=
ires three</div>
<div>&nbsp;&nbsp;&nbsp; different multi-topology IDs to be allocated from t=
he LDP MT-ID</div>
<div>&nbsp;&nbsp;&nbsp; space.</div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>The IETF datatracker status page for this draft is:</div>
<div><a href=3D"https://datatracker.ietf.org/doc/draft-atlas-mpls-ldp-mrt/"=
>https://datatracker.ietf.org/doc/draft-atlas-mpls-ldp-mrt/</a></div>
<div>&nbsp;</div>
<div>There's also a htmlized version available at:</div>
<div><a href=3D"http://tools.ietf.org/html/draft-atlas-mpls-ldp-mrt-02">htt=
p://tools.ietf.org/html/draft-atlas-mpls-ldp-mrt-02</a></div>
<div>&nbsp;</div>
<div>A diff from the previous version is available at:</div>
<div><a href=3D"http://www.ietf.org/rfcdiff?url2=3Ddraft-atlas-mpls-ldp-mrt=
-02">http://www.ietf.org/rfcdiff?url2=3Ddraft-atlas-mpls-ldp-mrt-02</a></di=
v>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>Please note that it may take a couple of minutes from the time of subm=
ission until the htmlized version and diff are available at tools.ietf.org.=
</div>
<div>&nbsp;</div>
<div>Internet-Drafts are also available by anonymous FTP at:</div>
<div><a href=3D"ftp://ftp.ietf.org/internet-drafts/">ftp://ftp.ietf.org/int=
ernet-drafts/</a></div>
<div>&nbsp;</div>
<div>_______________________________________________</div>
<div>mpls mailing list</div>
<div><a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a></div>
<div><a href=3D"https://www.ietf.org/mailman/listinfo/mpls">https://www.iet=
f.org/mailman/listinfo/mpls</a></div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>&nbsp;</div>
</span></font>
</body>
</html>

--_000_7347100B5761DC41A166AC17F22DF1121B89337Aeusaamb103erics_--


From nobody Tue Nov 18 16:08:35 2014
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Date: Wed, 19 Nov 2014 08:08:05 +0800
From: Loa Andersson <loa@pi.nu>
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Subject: [mpls] maturity of the MRT technology
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Working Groups,

We have don an MPLS-RT of draft-atlas-mpls-ldp-mrt, the reviews has been
posted to the mpls wg mailing list.

In his MPLS-RT review Stewart Bryant says:

"I have concerns about whether or not MRT technology has the  maturity
  expected in the standards track. However that decision needs to be
  taken in RTGWG and MPLS needs to follow their and lead in determining
  the fate and track of this draft. This draft should not be published
  ahead of the drafts that define the technology that it is supporting."

He also says that he see no reason not to go ahead and start the poll to
see if we have consensus to adopt the document as an mpls wg document.

The question Stewart ask is valid, and we'd like input from the rtgwg
and rtgwg chairs (copied on this mail). We will also copy both the
poll for adoption and the wglc to the rtgwg mailing list.

/Loa
mpls wg co-chair
-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


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State changed to Internal review.

URL: http://datatracker.ietf.org/doc/charter-ietf-mpls/


From nobody Wed Nov 19 08:38:58 2014
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From: Ronald Bonica <rbonica@juniper.net>
To: "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: draft-bonica-mpls-self-ping: Response to comments from the mike
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Subject: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Folks

At IETF 91, the following points were raised with regard to draft-bonica-mp=
ls-self-ping:

1) Why not use BFD?
2) Self-ping does not diagnose FIB programming errors in which an LSR other=
 than the egress de-encapsulates and forwards the packet.
3) How does Self ping verify a bidirectional LSP's readiness to carry traff=
ic in both directions?
4) Why does MPLS Self ping use MPLS Echo packets, as opposed to ICMP echo p=
ackets or some other packet format?

Responses follow:

1) Why not use BFD?

Self Ping is an extremely light-weight protocol. A typical Self Ping sessio=
n emits one or two packets and terminates less than one second after initia=
tion. Self-ping requires no configuration or control plane resources on the=
 egress LSR.=20

By contrast, BFD is designed to verify bi-directional connectivity over a l=
onger period of time. Therefore, MPLS Self Ping is appropriate in environme=
nts where BFD is too resource intensive.

2) Self-ping does not diagnose programming errors in which an LSR other tha=
n the egress de-encapsulates and forwards the packet.

Self Ping is designed to verify LSP readiness without consuming control pla=
ne resources on the egress router. It is not designed to diagnose programmi=
ng errors in which an LSR other than the egress de-encapsulates and forward=
s the packet. Mechanisms that diagnose such issues are available [RFC 4950]=
. However, they are more resource intensive.

3) How does Self ping verify a bidirectional LSP's readiness to carry traff=
ic in both directions?

In order to verify bidirectional LSP readiness, RSVP instantiates two LSP S=
elf Ping sessions, one at each end of the LSP. The LSR at one end of the LS=
P initiates a self ping session when it receives a RESV message. The LSR at=
 the other end of the LSP initiates a Self Ping Session when it sends a RES=
V message. Each LSP endpoint forwards traffic over the LSP only after the L=
SP Self Ping session terminates successfully

4) Why does LSP Self Ping use MPLS Echo packets, as opposed to some other p=
acket format?

LSP Self Ping could have used many packet formats. The only hard requiremen=
t was to have one 64-bit field in which the 64 bit session identifier could=
 be encoded. The MPLS Echo packet was convenient because its Senders Handle=
 is 64-bits long.=20

I will update the draft to reflect this information.

Ron Bonica


From nobody Wed Nov 19 09:19:21 2014
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From: "Nagendra Kumar Nainar (naikumar)" <naikumar@cisco.com>
To: Ronald Bonica <rbonica@juniper.net>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Hi Ron,

Please see below..

On 11/19/14, 11:38 AM, "Ronald Bonica" <rbonica@juniper.net> wrote:

>1) Why not use BFD?
>
>Self Ping is an extremely light-weight protocol. A typical Self Ping
>session emits one or two packets and terminates less than one second
>after initiation. Self-ping requires no configuration or control plane
>resources on the egress LSR.
>
>By contrast, BFD is designed to verify bi-directional connectivity over a
>longer period of time. Therefore, MPLS Self Ping is appropriate in
>environments where BFD is too resource intensive.
>
<Nagendra> I think this can be achieved by multiphop echo BFD control
packet sent as self destinated. IMHO, the size will be less for BFD packet
and still the validation can  be done without the control plane
involvement of egress node. Also with SBFD and BFD HW offload in egress, I
think it should not be a concern.

On the same line, I think, a deployment that is concerned about the
initial drops for few msec will also be concerned about the LSP health
(ex: continuous traffic blackholing due to DP failure) and may need BFD to
perform the check. So the use of BFD will help with both initial and
continuous check.

-Nagendra


From nobody Wed Nov 19 12:26:37 2014
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From: Ronald Bonica <rbonica@juniper.net>
To: "Nagendra Kumar Nainar (naikumar)" <naikumar@cisco.com>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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> >
> <Nagendra> I think this can be achieved by multiphop echo BFD control
> packet sent as self destinated. IMHO, the size will be less for BFD packe=
t and
> still the validation can  be done without the control plane involvement o=
f
> egress node. Also with SBFD and BFD HW offload in egress, I think it shou=
ld
> not be a concern.
>=20

Nagendra,

Which of the following are you proposing?

1) The ingress LSR formats a BFD control message and encapsulates in UDP an=
d IP. The IP address is that of the ingress LSR. The ingress LSR forwards t=
he packet over the LSR under test. The egress LSR receives the packet and f=
orwards it back to the ingress LSR, exactly as it would forward any other p=
acket. The egress LSR never examines anything beyond the IP header.

2) Something else

If something else, what?

                                                   Ron


From nobody Wed Nov 19 15:56:40 2014
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From: "Nagendra Kumar Nainar (naikumar)" <naikumar@cisco.com>
To: Ronald Bonica <rbonica@juniper.net>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Hi Ron,

On 11/19/14, 3:26 PM, "Ronald Bonica" <rbonica@juniper.net> wrote:

>> >
>> <Nagendra> I think this can be achieved by multiphop echo BFD control
>> packet sent as self destinated. IMHO, the size will be less for BFD
>>packet and
>> still the validation can  be done without the control plane involvement
>>of
>> egress node. Also with SBFD and BFD HW offload in egress, I think it
>>should
>> not be a concern.
>>=20
>
>Nagendra,
>
>Which of the following are you proposing?
>
>1) The ingress LSR formats a BFD control message and encapsulates in UDP
>and IP. The IP address is that of the ingress LSR. The ingress LSR
>forwards the packet over the LSR under test. The egress LSR receives the
>packet and forwards it back to the ingress LSR, exactly as it would
>forward any other packet. The egress LSR never examines anything beyond
>the IP header.

Yes and I think this can be achieved with both traditional and SBFD.
=20
>
>2) Something else
>
>If something else, what?
>
>                                                   Ron
>
>_______________________________________________
>mpls mailing list
>mpls@ietf.org
>https://www.ietf.org/mailman/listinfo/mpls


From nobody Wed Nov 19 16:37:18 2014
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From: Ronald Bonica <rbonica@juniper.net>
To: "Nagendra Kumar Nainar (naikumar)" <naikumar@cisco.com>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Nagendra,

If 1) is what you are proposing, there is virtually no difference between y=
our proposal and what is documented in the draft. In either case:

- The egress LSR never looks beyond the IP header. It simply forwards the p=
acket based upon IP destination.
- On the ingress node, the packet is forwarded to a dynamic UDP port. The a=
pplication listening on that port is neither BFD nor MPLS Echo. It is LSP S=
elf Ping.

The only difference between the two proposals is the format of the probe me=
ssage.

                                                                        Ron



> -----Original Message-----
> From: Nagendra Kumar Nainar (naikumar) [mailto:naikumar@cisco.com]
> Sent: Wednesday, November 19, 2014 6:57 PM
> To: Ronald Bonica; mpls@ietf.org
> Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments fro=
m
> the mike
>=20
> Hi Ron,
>=20
> On 11/19/14, 3:26 PM, "Ronald Bonica" <rbonica@juniper.net> wrote:
>=20
> >> >
> >> <Nagendra> I think this can be achieved by multiphop echo BFD control
> >>packet sent as self destinated. IMHO, the size will be less for BFD
> >>packet and  still the validation can  be done without the control
> >>plane involvement of  egress node. Also with SBFD and BFD HW offload
> >>in egress, I think it should  not be a concern.
> >>
> >
> >Nagendra,
> >
> >Which of the following are you proposing?
> >
> >1) The ingress LSR formats a BFD control message and encapsulates in UDP
> >and IP. The IP address is that of the ingress LSR. The ingress LSR
> >forwards the packet over the LSR under test. The egress LSR receives the
> >packet and forwards it back to the ingress LSR, exactly as it would
> >forward any other packet. The egress LSR never examines anything beyond
> >the IP header.
>=20
> Yes and I think this can be achieved with both traditional and SBFD.
>=20
> >
> >2) Something else
> >
> >If something else, what?
> >
> >                                                   Ron
> >
> >_______________________________________________
> >mpls mailing list
> >mpls@ietf.org
> >https://www.ietf.org/mailman/listinfo/mpls


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Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Hi Ron,

Still trying to understand the need for the draft, hence, have few of =
questions and need clarifications. Appreciate your response in advance.

1. (clarification q) The Ingress LSR sends the Echo request, with =
destination IP address to self, and forwards to Egress LSR (sec 2), =
correct?  Is this the only thing which identifies the Ingress LSR or =
something else too?
2. What happens if there is LSP breakage or something and the Echo =
request ends up on transit LSR? Doesn't it process? I see that draft =
says, this will avoid control plane processing. How so? The packet is =
forwarded from ingress to egress, which means, the egress will have to =
process the packet i.e. look up the ip address to send it back to =
ingress.

Draft says "The egress LSR forwards the MPLS Echo message to its =
destination, the
   ingress LSR.  The egress LSR forwards the MPLS Echo message exactly
   as it would forward any other packet."

Could you explain, how egress forwards the packet back to ingress w/o =
looking up the packet IP header i.e. in the data plane and no additional =
control plane of OAM process?
3. Is the assertion that, if Echo Reply is received back at the ingress =
then it is failure, rather it should receive Echo Request back at =
Ingress, correct?
4. Why can't you use LSP proxy ping to self via Egress?

Will followup with additional questions, if any, based on your =
responses.

cheers
-sam

> On Nov 19, 2014, at 8:38 AM, Ronald Bonica <rbonica@juniper.net> =
wrote:
>=20
> Folks
>=20
> At IETF 91, the following points were raised with regard to =
draft-bonica-mpls-self-ping:
>=20
> 1) Why not use BFD?
> 2) Self-ping does not diagnose FIB programming errors in which an LSR =
other than the egress de-encapsulates and forwards the packet.
> 3) How does Self ping verify a bidirectional LSP's readiness to carry =
traffic in both directions?
> 4) Why does MPLS Self ping use MPLS Echo packets, as opposed to ICMP =
echo packets or some other packet format?
>=20
> Responses follow:
>=20
> 1) Why not use BFD?
>=20
> Self Ping is an extremely light-weight protocol. A typical Self Ping =
session emits one or two packets and terminates less than one second =
after initiation. Self-ping requires no configuration or control plane =
resources on the egress LSR.=20
>=20
> By contrast, BFD is designed to verify bi-directional connectivity =
over a longer period of time. Therefore, MPLS Self Ping is appropriate =
in environments where BFD is too resource intensive.
>=20
> 2) Self-ping does not diagnose programming errors in which an LSR =
other than the egress de-encapsulates and forwards the packet.
>=20
> Self Ping is designed to verify LSP readiness without consuming =
control plane resources on the egress router. It is not designed to =
diagnose programming errors in which an LSR other than the egress =
de-encapsulates and forwards the packet. Mechanisms that diagnose such =
issues are available [RFC 4950]. However, they are more resource =
intensive.
>=20
> 3) How does Self ping verify a bidirectional LSP's readiness to carry =
traffic in both directions?
>=20
> In order to verify bidirectional LSP readiness, RSVP instantiates two =
LSP Self Ping sessions, one at each end of the LSP. The LSR at one end =
of the LSP initiates a self ping session when it receives a RESV =
message. The LSR at the other end of the LSP initiates a Self Ping =
Session when it sends a RESV message. Each LSP endpoint forwards traffic =
over the LSP only after the LSP Self Ping session terminates =
successfully
>=20
> 4) Why does LSP Self Ping use MPLS Echo packets, as opposed to some =
other packet format?
>=20
> LSP Self Ping could have used many packet formats. The only hard =
requirement was to have one 64-bit field in which the 64 bit session =
identifier could be encoded. The MPLS Echo packet was convenient because =
its Senders Handle is 64-bits long.=20
>=20
> I will update the draft to reflect this information.
>=20
> Ron Bonica
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Hi Ron,<div class=3D""><br class=3D""></div><div =
class=3D"">Still trying to understand the need for the draft, hence, =
have few of questions and need clarifications. Appreciate your response =
in advance.</div><div class=3D""><br class=3D""></div><div class=3D"">1. =
(clarification q) The Ingress LSR sends the Echo request, with =
destination IP address to self, and forwards to Egress LSR (sec 2), =
correct? &nbsp;Is this the only thing which identifies the Ingress LSR =
or something else too?</div><div class=3D"">2. What happens if there is =
LSP breakage or something and the Echo request ends up on transit LSR? =
Doesn't it process? I see that draft says, this will avoid control plane =
processing. How so? The packet is forwarded from ingress to egress, =
which means, the egress will have to process the packet i.e. look up the =
ip address to send it back to ingress.</div><div class=3D""><br =
class=3D""></div><div class=3D"">Draft says "<span style=3D"font-size: =
13px; line-height: 1.2em;" class=3D"">The egress LSR forwards the MPLS =
Echo message to its destination, the</span></div><pre =
style=3D"line-height: 1.2em; margin-top: 0px; margin-bottom: 0px; =
font-size: 13px;" class=3D"">   ingress LSR.  The egress LSR forwards =
the MPLS Echo message exactly
   as it would forward any other packet."</pre><pre style=3D"line-height: =
1.2em; margin-top: 0px; margin-bottom: 0px; font-size: 13px;" =
class=3D""><br class=3D""></pre><pre style=3D"line-height: 1.2em; =
margin-top: 0px; margin-bottom: 0px; font-size: 13px;" class=3D"">Could =
you explain, how egress forwards the packet back to ingress w/o looking =
up the packet IP header i.e. in the data plane and no additional control =
plane of OAM process?</pre><div class=3D"">3. Is the assertion that, if =
Echo Reply is received back at the ingress then it is failure, rather it =
should receive Echo Request back at Ingress, correct?</div><div =
class=3D"">4. Why can't you use LSP proxy ping to self via =
Egress?</div><div class=3D""><br class=3D""></div><div class=3D"">Will =
followup with additional questions, if any, based on your =
responses.</div><div class=3D""><br class=3D""></div><div =
class=3D"">cheers</div><div class=3D"">-sam</div><div class=3D""><br =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">On =
Nov 19, 2014, at 8:38 AM, Ronald Bonica &lt;<a =
href=3D"mailto:rbonica@juniper.net" class=3D"">rbonica@juniper.net</a>&gt;=
 wrote:</div><br class=3D"Apple-interchange-newline"><div =
class=3D"">Folks<br class=3D""><br class=3D"">At IETF 91, the following =
points were raised with regard to draft-bonica-mpls-self-ping:<br =
class=3D""><br class=3D"">1) Why not use BFD?<br class=3D"">2) Self-ping =
does not diagnose FIB programming errors in which an LSR other than the =
egress de-encapsulates and forwards the packet.<br class=3D"">3) How =
does Self ping verify a bidirectional LSP's readiness to carry traffic =
in both directions?<br class=3D"">4) Why does MPLS Self ping use MPLS =
Echo packets, as opposed to ICMP echo packets or some other packet =
format?<br class=3D""><br class=3D"">Responses follow:<br class=3D""><br =
class=3D"">1) Why not use BFD?<br class=3D""><br class=3D"">Self Ping is =
an extremely light-weight protocol. A typical Self Ping session emits =
one or two packets and terminates less than one second after initiation. =
Self-ping requires no configuration or control plane resources on the =
egress LSR. <br class=3D""><br class=3D"">By contrast, BFD is designed =
to verify bi-directional connectivity over a longer period of time. =
Therefore, MPLS Self Ping is appropriate in environments where BFD is =
too resource intensive.<br class=3D""><br class=3D"">2) Self-ping does =
not diagnose programming errors in which an LSR other than the egress =
de-encapsulates and forwards the packet.<br class=3D""><br class=3D"">Self=
 Ping is designed to verify LSP readiness without consuming control =
plane resources on the egress router. It is not designed to diagnose =
programming errors in which an LSR other than the egress de-encapsulates =
and forwards the packet. Mechanisms that diagnose such issues are =
available [RFC 4950]. However, they are more resource intensive.<br =
class=3D""><br class=3D"">3) How does Self ping verify a bidirectional =
LSP's readiness to carry traffic in both directions?<br class=3D""><br =
class=3D"">In order to verify bidirectional LSP readiness, RSVP =
instantiates two LSP Self Ping sessions, one at each end of the LSP. The =
LSR at one end of the LSP initiates a self ping session when it receives =
a RESV message. The LSR at the other end of the LSP initiates a Self =
Ping Session when it sends a RESV message. Each LSP endpoint forwards =
traffic over the LSP only after the LSP Self Ping session terminates =
successfully<br class=3D""><br class=3D"">4) Why does LSP Self Ping use =
MPLS Echo packets, as opposed to some other packet format?<br =
class=3D""><br class=3D"">LSP Self Ping could have used many packet =
formats. The only hard requirement was to have one 64-bit field in which =
the 64 bit session identifier could be encoded. The MPLS Echo packet was =
convenient because its Senders Handle is 64-bits long. <br class=3D""><br =
class=3D"">I will update the draft to reflect this information.<br =
class=3D""><br class=3D"">Ron Bonica<br class=3D""><br =
class=3D"">_______________________________________________<br =
class=3D"">mpls mailing list<br class=3D""><a =
href=3D"mailto:mpls@ietf.org" class=3D"">mpls@ietf.org</a><br =
class=3D"">https://www.ietf.org/mailman/listinfo/mpls<br =
class=3D""></div></blockquote></div><br class=3D""></div></body></html>=

--Apple-Mail=_B9F73C1F-F9A0-464C-B2A4-7A97528D71A1--


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From: Sam Aldrin <aldrin.ietf@gmail.com>
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To: Ronald Bonica <rbonica@juniper.net>
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Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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BTW, the draft also proposes the IP destination as routable address and =
not local host address.
This is re-defining the semantics defined in RFC4379.
Secondly, as mentioned earlier, when there is LSP failure, the packet =
will be routed to destination address, as Echo request. which in this =
case is ingress LSR.

-sam
> On Nov 19, 2014, at 7:28 PM, Sam Aldrin <aldrin.ietf@gmail.com> wrote:
>=20
> Hi Ron,
>=20
> Still trying to understand the need for the draft, hence, have few of =
questions and need clarifications. Appreciate your response in advance.
>=20
> 1. (clarification q) The Ingress LSR sends the Echo request, with =
destination IP address to self, and forwards to Egress LSR (sec 2), =
correct?  Is this the only thing which identifies the Ingress LSR or =
something else too?
> 2. What happens if there is LSP breakage or something and the Echo =
request ends up on transit LSR? Doesn't it process? I see that draft =
says, this will avoid control plane processing. How so? The packet is =
forwarded from ingress to egress, which means, the egress will have to =
process the packet i.e. look up the ip address to send it back to =
ingress.
>=20
> Draft says "The egress LSR forwards the MPLS Echo message to its =
destination, the
>    ingress LSR.  The egress LSR forwards the MPLS Echo message exactly
>    as it would forward any other packet."
>=20
> Could you explain, how egress forwards the packet back to ingress w/o =
looking up the packet IP header i.e. in the data plane and no additional =
control plane of OAM process?
> 3. Is the assertion that, if Echo Reply is received back at the =
ingress then it is failure, rather it should receive Echo Request back =
at Ingress, correct?
> 4. Why can't you use LSP proxy ping to self via Egress?
>=20
> Will followup with additional questions, if any, based on your =
responses.
>=20
> cheers
> -sam
>=20
>> On Nov 19, 2014, at 8:38 AM, Ronald Bonica <rbonica@juniper.net =
<mailto:rbonica@juniper.net>> wrote:
>>=20
>> Folks
>>=20
>> At IETF 91, the following points were raised with regard to =
draft-bonica-mpls-self-ping:
>>=20
>> 1) Why not use BFD?
>> 2) Self-ping does not diagnose FIB programming errors in which an LSR =
other than the egress de-encapsulates and forwards the packet.
>> 3) How does Self ping verify a bidirectional LSP's readiness to carry =
traffic in both directions?
>> 4) Why does MPLS Self ping use MPLS Echo packets, as opposed to ICMP =
echo packets or some other packet format?
>>=20
>> Responses follow:
>>=20
>> 1) Why not use BFD?
>>=20
>> Self Ping is an extremely light-weight protocol. A typical Self Ping =
session emits one or two packets and terminates less than one second =
after initiation. Self-ping requires no configuration or control plane =
resources on the egress LSR.=20
>>=20
>> By contrast, BFD is designed to verify bi-directional connectivity =
over a longer period of time. Therefore, MPLS Self Ping is appropriate =
in environments where BFD is too resource intensive.
>>=20
>> 2) Self-ping does not diagnose programming errors in which an LSR =
other than the egress de-encapsulates and forwards the packet.
>>=20
>> Self Ping is designed to verify LSP readiness without consuming =
control plane resources on the egress router. It is not designed to =
diagnose programming errors in which an LSR other than the egress =
de-encapsulates and forwards the packet. Mechanisms that diagnose such =
issues are available [RFC 4950]. However, they are more resource =
intensive.
>>=20
>> 3) How does Self ping verify a bidirectional LSP's readiness to carry =
traffic in both directions?
>>=20
>> In order to verify bidirectional LSP readiness, RSVP instantiates two =
LSP Self Ping sessions, one at each end of the LSP. The LSR at one end =
of the LSP initiates a self ping session when it receives a RESV =
message. The LSR at the other end of the LSP initiates a Self Ping =
Session when it sends a RESV message. Each LSP endpoint forwards traffic =
over the LSP only after the LSP Self Ping session terminates =
successfully
>>=20
>> 4) Why does LSP Self Ping use MPLS Echo packets, as opposed to some =
other packet format?
>>=20
>> LSP Self Ping could have used many packet formats. The only hard =
requirement was to have one 64-bit field in which the 64 bit session =
identifier could be encoded. The MPLS Echo packet was convenient because =
its Senders Handle is 64-bits long.=20
>>=20
>> I will update the draft to reflect this information.
>>=20
>> Ron Bonica
>>=20
>> _______________________________________________
>> mpls mailing list
>> mpls@ietf.org <mailto:mpls@ietf.org>
>> https://www.ietf.org/mailman/listinfo/mpls
>=20


--Apple-Mail=_CD238AE4-8C5E-4CCF-909D-4F27F4394EC0
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">BTW, the draft also proposes the IP destination as routable =
address and not local host address.<div class=3D"">This is re-defining =
the semantics defined in RFC4379.</div><div class=3D"">Secondly, as =
mentioned earlier, when there is LSP failure, the packet will be routed =
to destination address, as Echo request. which in this case is ingress =
LSR.</div><div class=3D""><br class=3D""></div><div class=3D"">-sam<br =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">On =
Nov 19, 2014, at 7:28 PM, Sam Aldrin &lt;<a =
href=3D"mailto:aldrin.ietf@gmail.com" =
class=3D"">aldrin.ietf@gmail.com</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><meta =
http-equiv=3D"Content-Type" content=3D"text/html charset=3Dus-ascii" =
class=3D""><div style=3D"word-wrap: break-word; -webkit-nbsp-mode: =
space; -webkit-line-break: after-white-space;" class=3D"">Hi Ron,<div =
class=3D""><br class=3D""></div><div class=3D"">Still trying to =
understand the need for the draft, hence, have few of questions and need =
clarifications. Appreciate your response in advance.</div><div =
class=3D""><br class=3D""></div><div class=3D"">1. (clarification q) The =
Ingress LSR sends the Echo request, with destination IP address to self, =
and forwards to Egress LSR (sec 2), correct? &nbsp;Is this the only =
thing which identifies the Ingress LSR or something else too?</div><div =
class=3D"">2. What happens if there is LSP breakage or something and the =
Echo request ends up on transit LSR? Doesn't it process? I see that =
draft says, this will avoid control plane processing. How so? The packet =
is forwarded from ingress to egress, which means, the egress will have =
to process the packet i.e. look up the ip address to send it back to =
ingress.</div><div class=3D""><br class=3D""></div><div class=3D"">Draft =
says "<span style=3D"font-size: 13px; line-height: 1.2em;" class=3D"">The =
egress LSR forwards the MPLS Echo message to its destination, =
the</span></div><pre style=3D"line-height: 1.2em; margin-top: 0px; =
margin-bottom: 0px; font-size: 13px;" class=3D"">   ingress LSR.  The =
egress LSR forwards the MPLS Echo message exactly
   as it would forward any other packet."</pre><pre style=3D"line-height: =
1.2em; margin-top: 0px; margin-bottom: 0px; font-size: 13px;" =
class=3D""><br class=3D""></pre><pre style=3D"line-height: 1.2em; =
margin-top: 0px; margin-bottom: 0px; font-size: 13px;" class=3D"">Could =
you explain, how egress forwards the packet back to ingress w/o looking =
up the packet IP header i.e. in the data plane and no additional control =
plane of OAM process?</pre><div class=3D"">3. Is the assertion that, if =
Echo Reply is received back at the ingress then it is failure, rather it =
should receive Echo Request back at Ingress, correct?</div><div =
class=3D"">4. Why can't you use LSP proxy ping to self via =
Egress?</div><div class=3D""><br class=3D""></div><div class=3D"">Will =
followup with additional questions, if any, based on your =
responses.</div><div class=3D""><br class=3D""></div><div =
class=3D"">cheers</div><div class=3D"">-sam</div><div class=3D""><br =
class=3D""><div class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">On Nov 19, 2014, at 8:38 AM, Ronald Bonica &lt;<a =
href=3D"mailto:rbonica@juniper.net" class=3D"">rbonica@juniper.net</a>&gt;=
 wrote:</div><br class=3D"Apple-interchange-newline"><div =
class=3D"">Folks<br class=3D""><br class=3D"">At IETF 91, the following =
points were raised with regard to draft-bonica-mpls-self-ping:<br =
class=3D""><br class=3D"">1) Why not use BFD?<br class=3D"">2) Self-ping =
does not diagnose FIB programming errors in which an LSR other than the =
egress de-encapsulates and forwards the packet.<br class=3D"">3) How =
does Self ping verify a bidirectional LSP's readiness to carry traffic =
in both directions?<br class=3D"">4) Why does MPLS Self ping use MPLS =
Echo packets, as opposed to ICMP echo packets or some other packet =
format?<br class=3D""><br class=3D"">Responses follow:<br class=3D""><br =
class=3D"">1) Why not use BFD?<br class=3D""><br class=3D"">Self Ping is =
an extremely light-weight protocol. A typical Self Ping session emits =
one or two packets and terminates less than one second after initiation. =
Self-ping requires no configuration or control plane resources on the =
egress LSR. <br class=3D""><br class=3D"">By contrast, BFD is designed =
to verify bi-directional connectivity over a longer period of time. =
Therefore, MPLS Self Ping is appropriate in environments where BFD is =
too resource intensive.<br class=3D""><br class=3D"">2) Self-ping does =
not diagnose programming errors in which an LSR other than the egress =
de-encapsulates and forwards the packet.<br class=3D""><br class=3D"">Self=
 Ping is designed to verify LSP readiness without consuming control =
plane resources on the egress router. It is not designed to diagnose =
programming errors in which an LSR other than the egress de-encapsulates =
and forwards the packet. Mechanisms that diagnose such issues are =
available [RFC 4950]. However, they are more resource intensive.<br =
class=3D""><br class=3D"">3) How does Self ping verify a bidirectional =
LSP's readiness to carry traffic in both directions?<br class=3D""><br =
class=3D"">In order to verify bidirectional LSP readiness, RSVP =
instantiates two LSP Self Ping sessions, one at each end of the LSP. The =
LSR at one end of the LSP initiates a self ping session when it receives =
a RESV message. The LSR at the other end of the LSP initiates a Self =
Ping Session when it sends a RESV message. Each LSP endpoint forwards =
traffic over the LSP only after the LSP Self Ping session terminates =
successfully<br class=3D""><br class=3D"">4) Why does LSP Self Ping use =
MPLS Echo packets, as opposed to some other packet format?<br =
class=3D""><br class=3D"">LSP Self Ping could have used many packet =
formats. The only hard requirement was to have one 64-bit field in which =
the 64 bit session identifier could be encoded. The MPLS Echo packet was =
convenient because its Senders Handle is 64-bits long. <br class=3D""><br =
class=3D"">I will update the draft to reflect this information.<br =
class=3D""><br class=3D"">Ron Bonica<br class=3D""><br =
class=3D"">_______________________________________________<br =
class=3D"">mpls mailing list<br class=3D""><a =
href=3D"mailto:mpls@ietf.org" class=3D"">mpls@ietf.org</a><br =
class=3D""><a href=3D"https://www.ietf.org/mailman/listinfo/mpls" =
class=3D"">https://www.ietf.org/mailman/listinfo/mpls</a><br =
class=3D""></div></blockquote></div><br =
class=3D""></div></div></div></blockquote></div><br =
class=3D""></div></body></html>=

--Apple-Mail=_CD238AE4-8C5E-4CCF-909D-4F27F4394EC0--


From nobody Thu Nov 20 05:33:44 2014
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From: "Nagendra Kumar Nainar (naikumar)" <naikumar@cisco.com>
To: Ronald Bonica <rbonica@juniper.net>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Hi Ron,

Yes. That is right.

This being a local matter to ingress, I am trying to say that BFD can also
be used, as a response to your initial email  that said, why BFD cannot be
used :)


Regards,
Nagendra

On 11/19/14, 7:36 PM, "Ronald Bonica" <rbonica@juniper.net> wrote:

>Nagendra,
>
>If 1) is what you are proposing, there is virtually no difference between
>your proposal and what is documented in the draft. In either case:
>
>- The egress LSR never looks beyond the IP header. It simply forwards the
>packet based upon IP destination.
>- On the ingress node, the packet is forwarded to a dynamic UDP port. The
>application listening on that port is neither BFD nor MPLS Echo. It is
>LSP Self Ping.
>
>The only difference between the two proposals is the format of the probe
>message.
>
>                 =20
>Ron
>
>
>
>> -----Original Message-----
>> From: Nagendra Kumar Nainar (naikumar) [mailto:naikumar@cisco.com]
>> Sent: Wednesday, November 19, 2014 6:57 PM
>> To: Ronald Bonica; mpls@ietf.org
>> Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments
>>from
>> the mike
>>=20
>> Hi Ron,
>>=20
>> On 11/19/14, 3:26 PM, "Ronald Bonica" <rbonica@juniper.net> wrote:
>>=20
>> >> >
>> >> <Nagendra> I think this can be achieved by multiphop echo BFD control
>> >>packet sent as self destinated. IMHO, the size will be less for BFD
>> >>packet and  still the validation can  be done without the control
>> >>plane involvement of  egress node. Also with SBFD and BFD HW offload
>> >>in egress, I think it should  not be a concern.
>> >>
>> >
>> >Nagendra,
>> >
>> >Which of the following are you proposing?
>> >
>> >1) The ingress LSR formats a BFD control message and encapsulates in
>>UDP
>> >and IP. The IP address is that of the ingress LSR. The ingress LSR
>> >forwards the packet over the LSR under test. The egress LSR receives
>>the
>> >packet and forwards it back to the ingress LSR, exactly as it would
>> >forward any other packet. The egress LSR never examines anything beyond
>> >the IP header.
>>=20
>> Yes and I think this can be achieved with both traditional and SBFD.
>>=20
>> >
>> >2) Something else
>> >
>> >If something else, what?
>> >
>> >                                                   Ron
>> >
>> >_______________________________________________
>> >mpls mailing list
>> >mpls@ietf.org
>> >https://www.ietf.org/mailman/listinfo/mpls
>


From nobody Thu Nov 20 06:42:41 2014
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To: Sam Aldrin <aldrin.ietf@gmail.com>
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Cc: Ronald Bonica <rbonica@juniper.net>, "mpls@ietf.org" <mpls@ietf.org>
Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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=09
	To me what is described in the draft seems like this is a =
description of a device/vendor feature that automates the basic =
procedures of 4379/etc.. This can and has been done for quite some time =
using other means such as onboard automated scripts/actions after paths =
are established/signaled. I say this not to be glib, but because I built =
such a thing about 10 years ago that has been deployed widely.  Also, as =
Sam says, there is some deviation from RFC4379 which we should ask is =
worth the additional complication (and required implementation + =
associated delay/etc...) versus just using the existing means.=20

	The bottom line is that we should be asking ourselves whether or =
not this something we really need to standardize.

	=E2=80=94Tom



> On Nov 19, 2014:10:28 PM, at 10:28 PM, Sam Aldrin =
<aldrin.ietf@gmail.com> wrote:
>=20
> Hi Ron,
>=20
> Still trying to understand the need for the draft, hence, have few of =
questions and need clarifications. Appreciate your response in advance.
>=20
> 1. (clarification q) The Ingress LSR sends the Echo request, with =
destination IP address to self, and forwards to Egress LSR (sec 2), =
correct?  Is this the only thing which identifies the Ingress LSR or =
something else too?
> 2. What happens if there is LSP breakage or something and the Echo =
request ends up on transit LSR? Doesn't it process? I see that draft =
says, this will avoid control plane processing. How so? The packet is =
forwarded from ingress to egress, which means, the egress will have to =
process the packet i.e. look up the ip address to send it back to =
ingress.
>=20
> Draft says "The egress LSR forwards the MPLS Echo message to its =
destination, the
>    ingress LSR.  The egress LSR forwards the MPLS Echo message exactly
>    as it would forward any other packet."
>=20
> Could you explain, how egress forwards the packet back to ingress w/o =
looking up the packet IP header i.e. in the data plane and no additional =
control plane of OAM process?
> 3. Is the assertion that, if Echo Reply is received back at the =
ingress then it is failure, rather it should receive Echo Request back =
at Ingress, correct?
> 4. Why can't you use LSP proxy ping to self via Egress?
>=20
> Will followup with additional questions, if any, based on your =
responses.
>=20
> cheers
> -sam
>=20
>> On Nov 19, 2014, at 8:38 AM, Ronald Bonica <rbonica@juniper.net =
<mailto:rbonica@juniper.net>> wrote:
>>=20
>> Folks
>>=20
>> At IETF 91, the following points were raised with regard to =
draft-bonica-mpls-self-ping:
>>=20
>> 1) Why not use BFD?
>> 2) Self-ping does not diagnose FIB programming errors in which an LSR =
other than the egress de-encapsulates and forwards the packet.
>> 3) How does Self ping verify a bidirectional LSP's readiness to carry =
traffic in both directions?
>> 4) Why does MPLS Self ping use MPLS Echo packets, as opposed to ICMP =
echo packets or some other packet format?
>>=20
>> Responses follow:
>>=20
>> 1) Why not use BFD?
>>=20
>> Self Ping is an extremely light-weight protocol. A typical Self Ping =
session emits one or two packets and terminates less than one second =
after initiation. Self-ping requires no configuration or control plane =
resources on the egress LSR.=20
>>=20
>> By contrast, BFD is designed to verify bi-directional connectivity =
over a longer period of time. Therefore, MPLS Self Ping is appropriate =
in environments where BFD is too resource intensive.
>>=20
>> 2) Self-ping does not diagnose programming errors in which an LSR =
other than the egress de-encapsulates and forwards the packet.
>>=20
>> Self Ping is designed to verify LSP readiness without consuming =
control plane resources on the egress router. It is not designed to =
diagnose programming errors in which an LSR other than the egress =
de-encapsulates and forwards the packet. Mechanisms that diagnose such =
issues are available [RFC 4950]. However, they are more resource =
intensive.
>>=20
>> 3) How does Self ping verify a bidirectional LSP's readiness to carry =
traffic in both directions?
>>=20
>> In order to verify bidirectional LSP readiness, RSVP instantiates two =
LSP Self Ping sessions, one at each end of the LSP. The LSR at one end =
of the LSP initiates a self ping session when it receives a RESV =
message. The LSR at the other end of the LSP initiates a Self Ping =
Session when it sends a RESV message. Each LSP endpoint forwards traffic =
over the LSP only after the LSP Self Ping session terminates =
successfully
>>=20
>> 4) Why does LSP Self Ping use MPLS Echo packets, as opposed to some =
other packet format?
>>=20
>> LSP Self Ping could have used many packet formats. The only hard =
requirement was to have one 64-bit field in which the 64 bit session =
identifier could be encoded. The MPLS Echo packet was convenient because =
its Senders Handle is 64-bits long.=20
>>=20
>> I will update the draft to reflect this information.
>>=20
>> Ron Bonica
>>=20
>> _______________________________________________
>> mpls mailing list
>> mpls@ietf.org <mailto:mpls@ietf.org>
>> https://www.ietf.org/mailman/listinfo/mpls
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls


--Apple-Mail=_6879C6E2-0F49-4820-AD3E-BD17E4D0ACD1
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><span class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span><div class=3D""><span class=3D"Apple-tab-span" =
style=3D"white-space:pre">	</span>To me what is described in the =
draft seems like this is a description of a device/vendor feature that =
automates the basic procedures of 4379/etc.. This can and has been done =
for quite some time using other means such as onboard automated =
scripts/actions after paths are established/signaled. I say this not to =
be glib, but because I built such a thing about 10 years ago that has =
been deployed widely. &nbsp;Also, as Sam says, there is some deviation =
from RFC4379 which we should ask is worth the additional complication =
(and required implementation + associated delay/etc...) versus just =
using the existing means.&nbsp;</div><div class=3D""><br =
class=3D""></div><div class=3D""><span class=3D"Apple-tab-span" =
style=3D"white-space:pre">	</span>The bottom line is that we should =
be asking ourselves whether or not this something we really need to =
standardize.</div><div class=3D""><br class=3D""></div><div =
class=3D""><span class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>=E2=80=94Tom</div><div class=3D""><br class=3D""></div><div =
class=3D""><br class=3D""></div><div class=3D""><br =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">On =
Nov 19, 2014:10:28 PM, at 10:28 PM, Sam Aldrin &lt;<a =
href=3D"mailto:aldrin.ietf@gmail.com" =
class=3D"">aldrin.ietf@gmail.com</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><meta =
http-equiv=3D"Content-Type" content=3D"text/html charset=3Dus-ascii" =
class=3D""><div style=3D"word-wrap: break-word; -webkit-nbsp-mode: =
space; -webkit-line-break: after-white-space;" class=3D"">Hi Ron,<div =
class=3D""><br class=3D""></div><div class=3D"">Still trying to =
understand the need for the draft, hence, have few of questions and need =
clarifications. Appreciate your response in advance.</div><div =
class=3D""><br class=3D""></div><div class=3D"">1. (clarification q) The =
Ingress LSR sends the Echo request, with destination IP address to self, =
and forwards to Egress LSR (sec 2), correct? &nbsp;Is this the only =
thing which identifies the Ingress LSR or something else too?</div><div =
class=3D"">2. What happens if there is LSP breakage or something and the =
Echo request ends up on transit LSR? Doesn't it process? I see that =
draft says, this will avoid control plane processing. How so? The packet =
is forwarded from ingress to egress, which means, the egress will have =
to process the packet i.e. look up the ip address to send it back to =
ingress.</div><div class=3D""><br class=3D""></div><div class=3D"">Draft =
says "<span style=3D"font-size: 13px; line-height: 1.2em;" class=3D"">The =
egress LSR forwards the MPLS Echo message to its destination, =
the</span></div><pre style=3D"line-height: 1.2em; margin-top: 0px; =
margin-bottom: 0px; font-size: 13px;" class=3D"">   ingress LSR.  The =
egress LSR forwards the MPLS Echo message exactly
   as it would forward any other packet."</pre><pre style=3D"line-height: =
1.2em; margin-top: 0px; margin-bottom: 0px; font-size: 13px;" =
class=3D""><br class=3D""></pre><pre style=3D"line-height: 1.2em; =
margin-top: 0px; margin-bottom: 0px; font-size: 13px;" class=3D"">Could =
you explain, how egress forwards the packet back to ingress w/o looking =
up the packet IP header i.e. in the data plane and no additional control =
plane of OAM process?</pre><div class=3D"">3. Is the assertion that, if =
Echo Reply is received back at the ingress then it is failure, rather it =
should receive Echo Request back at Ingress, correct?</div><div =
class=3D"">4. Why can't you use LSP proxy ping to self via =
Egress?</div><div class=3D""><br class=3D""></div><div class=3D"">Will =
followup with additional questions, if any, based on your =
responses.</div><div class=3D""><br class=3D""></div><div =
class=3D"">cheers</div><div class=3D"">-sam</div><div class=3D""><br =
class=3D""><div class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">On Nov 19, 2014, at 8:38 AM, Ronald Bonica &lt;<a =
href=3D"mailto:rbonica@juniper.net" class=3D"">rbonica@juniper.net</a>&gt;=
 wrote:</div><br class=3D"Apple-interchange-newline"><div =
class=3D"">Folks<br class=3D""><br class=3D"">At IETF 91, the following =
points were raised with regard to draft-bonica-mpls-self-ping:<br =
class=3D""><br class=3D"">1) Why not use BFD?<br class=3D"">2) Self-ping =
does not diagnose FIB programming errors in which an LSR other than the =
egress de-encapsulates and forwards the packet.<br class=3D"">3) How =
does Self ping verify a bidirectional LSP's readiness to carry traffic =
in both directions?<br class=3D"">4) Why does MPLS Self ping use MPLS =
Echo packets, as opposed to ICMP echo packets or some other packet =
format?<br class=3D""><br class=3D"">Responses follow:<br class=3D""><br =
class=3D"">1) Why not use BFD?<br class=3D""><br class=3D"">Self Ping is =
an extremely light-weight protocol. A typical Self Ping session emits =
one or two packets and terminates less than one second after initiation. =
Self-ping requires no configuration or control plane resources on the =
egress LSR. <br class=3D""><br class=3D"">By contrast, BFD is designed =
to verify bi-directional connectivity over a longer period of time. =
Therefore, MPLS Self Ping is appropriate in environments where BFD is =
too resource intensive.<br class=3D""><br class=3D"">2) Self-ping does =
not diagnose programming errors in which an LSR other than the egress =
de-encapsulates and forwards the packet.<br class=3D""><br class=3D"">Self=
 Ping is designed to verify LSP readiness without consuming control =
plane resources on the egress router. It is not designed to diagnose =
programming errors in which an LSR other than the egress de-encapsulates =
and forwards the packet. Mechanisms that diagnose such issues are =
available [RFC 4950]. However, they are more resource intensive.<br =
class=3D""><br class=3D"">3) How does Self ping verify a bidirectional =
LSP's readiness to carry traffic in both directions?<br class=3D""><br =
class=3D"">In order to verify bidirectional LSP readiness, RSVP =
instantiates two LSP Self Ping sessions, one at each end of the LSP. The =
LSR at one end of the LSP initiates a self ping session when it receives =
a RESV message. The LSR at the other end of the LSP initiates a Self =
Ping Session when it sends a RESV message. Each LSP endpoint forwards =
traffic over the LSP only after the LSP Self Ping session terminates =
successfully<br class=3D""><br class=3D"">4) Why does LSP Self Ping use =
MPLS Echo packets, as opposed to some other packet format?<br =
class=3D""><br class=3D"">LSP Self Ping could have used many packet =
formats. The only hard requirement was to have one 64-bit field in which =
the 64 bit session identifier could be encoded. The MPLS Echo packet was =
convenient because its Senders Handle is 64-bits long. <br class=3D""><br =
class=3D"">I will update the draft to reflect this information.<br =
class=3D""><br class=3D"">Ron Bonica<br class=3D""><br =
class=3D"">_______________________________________________<br =
class=3D"">mpls mailing list<br class=3D""><a =
href=3D"mailto:mpls@ietf.org" class=3D"">mpls@ietf.org</a><br =
class=3D""><a href=3D"https://www.ietf.org/mailman/listinfo/mpls" =
class=3D"">https://www.ietf.org/mailman/listinfo/mpls</a><br =
class=3D""></div></blockquote></div><br =
class=3D""></div></div>_______________________________________________<br =
class=3D"">mpls mailing list<br class=3D""><a =
href=3D"mailto:mpls@ietf.org" class=3D"">mpls@ietf.org</a><br =
class=3D"">https://www.ietf.org/mailman/listinfo/mpls<br =
class=3D""></div></blockquote></div><br class=3D""></div></body></html>=

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To: "Thomas D. Nadeau" <tnadeau@lucidvision.com>, Sam Aldrin <aldrin.ietf@gmail.com>
Date: Thu, 20 Nov 2014 10:36:12 -0500
Thread-Topic: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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From nobody Thu Nov 20 10:17:31 2014
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Date: Thu, 20 Nov 2014 13:17:23 -0500
Message-ID: <CAG4d1rfRuyzJS9HjHN_yH69PGa_V=iPeyvxxxFUyKMK_gUqBhA@mail.gmail.com>
From: Alia Atlas <akatlas@gmail.com>
To: Loa Andersson <loa@pi.nu>
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Cc: "mpls@ietf.org" <mpls@ietf.org>, "mpls-chairs@tools.ietf.org" <mpls-chairs@tools.ietf.org>, draft-atlas-mpls-ldp-mrt@tools.ietf.org, "rtgwg@ietf.org" <rtgwg@ietf.org>
Subject: Re: [mpls] maturity of the MRT technology
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Loa,

Without any hats on, I would note:

a) As far as I'm aware, this has seen two independent prototypes
implemented.
b) I have not heard any concrete technical concerns.  Stewart and I did
specificallly
discuss MRT this past IETF.  I am, of course, quite interested in hearing
any
concrete technical concerns.

c) I'd be happy seeing this question asked of more drafts :-)

Regards,
Alia


On Tue, Nov 18, 2014 at 7:08 PM, Loa Andersson <loa@pi.nu> wrote:

> Working Groups,
>
> We have don an MPLS-RT of draft-atlas-mpls-ldp-mrt, the reviews has been
> posted to the mpls wg mailing list.
>
> In his MPLS-RT review Stewart Bryant says:
>
> "I have concerns about whether or not MRT technology has the  maturity
>  expected in the standards track. However that decision needs to be
>  taken in RTGWG and MPLS needs to follow their and lead in determining
>  the fate and track of this draft. This draft should not be published
>  ahead of the drafts that define the technology that it is supporting."
>
> He also says that he see no reason not to go ahead and start the poll to
> see if we have consensus to adopt the document as an mpls wg document.
>
> The question Stewart ask is valid, and we'd like input from the rtgwg
> and rtgwg chairs (copied on this mail). We will also copy both the
> poll for adoption and the wglc to the rtgwg mailing list.
>
> /Loa
> mpls wg co-chair
> --
>
>
> Loa Andersson                        email: loa@mail01.huawei.com
> Senior MPLS Expert                          loa@pi.nu
> Huawei Technologies (consultant)     phone: +46 739 81 21 64
>
> _______________________________________________
> rtgwg mailing list
> rtgwg@ietf.org
> https://www.ietf.org/mailman/listinfo/rtgwg
>

--001a1139d06afac79505084e566f
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<div dir=3D"ltr">Loa,<div><br></div><div>Without any hats on, I would note:=
</div><div><br></div><div>a) As far as I&#39;m aware, this has seen two ind=
ependent prototypes implemented.</div><div>b) I have not heard any concrete=
 technical concerns.=C2=A0 Stewart and I did specificallly</div><div>discus=
s MRT this past IETF.=C2=A0 I am, of course, quite interested in hearing an=
y</div><div>concrete technical concerns.</div><div><br></div><div>c) I&#39;=
d be happy seeing this question asked of more drafts :-)</div><div><br></di=
v><div>Regards,</div><div>Alia</div><div><br></div></div><div class=3D"gmai=
l_extra"><br><div class=3D"gmail_quote">On Tue, Nov 18, 2014 at 7:08 PM, Lo=
a Andersson <span dir=3D"ltr">&lt;<a href=3D"mailto:loa@pi.nu" target=3D"_b=
lank">loa@pi.nu</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" =
style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Wor=
king Groups,<br>
<br>
We have don an MPLS-RT of draft-atlas-mpls-ldp-mrt, the reviews has been<br=
>
posted to the mpls wg mailing list.<br>
<br>
In his MPLS-RT review Stewart Bryant says:<br>
<br>
&quot;I have concerns about whether or not MRT technology has the=C2=A0 mat=
urity<br>
=C2=A0expected in the standards track. However that decision needs to be<br=
>
=C2=A0taken in RTGWG and MPLS needs to follow their and lead in determining=
<br>
=C2=A0the fate and track of this draft. This draft should not be published<=
br>
=C2=A0ahead of the drafts that define the technology that it is supporting.=
&quot;<br>
<br>
He also says that he see no reason not to go ahead and start the poll to<br=
>
see if we have consensus to adopt the document as an mpls wg document.<br>
<br>
The question Stewart ask is valid, and we&#39;d like input from the rtgwg<b=
r>
and rtgwg chairs (copied on this mail). We will also copy both the<br>
poll for adoption and the wglc to the rtgwg mailing list.<br>
<br>
/Loa<br>
mpls wg co-chair<span class=3D"HOEnZb"><font color=3D"#888888"><br>
-- <br>
<br>
<br>
Loa Andersson=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 email: <a href=3D"mailto:loa@mail01.huawei.com" targe=
t=3D"_blank">loa@mail01.huawei.com</a><br>
Senior MPLS Expert=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"mailto:loa@pi.nu" target=3D"_=
blank">loa@pi.nu</a><br>
Huawei Technologies (consultant)=C2=A0 =C2=A0 =C2=A0phone: <a href=3D"tel:%=
2B46%20739%2081%2021%2064" value=3D"+46739812164" target=3D"_blank">+46 739=
 81 21 64</a><br>
<br>
______________________________<u></u>_________________<br>
rtgwg mailing list<br>
<a href=3D"mailto:rtgwg@ietf.org" target=3D"_blank">rtgwg@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/rtgwg" target=3D"_blank">h=
ttps://www.ietf.org/mailman/<u></u>listinfo/rtgwg</a><br>
</font></span></blockquote></div><br></div>

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From: "Nobo Akiya (nobo)" <nobo@cisco.com>
To: "Shah, Himanshu" <hshah@ciena.com>, "Thomas D. Nadeau" <tnadeau@lucidvision.com>, Sam Aldrin <aldrin.ietf@gmail.com>
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From: Shahram Davari <davari@broadcom.com>
To: "Nobo Akiya (nobo)" <nobo@cisco.com>, "Shah, Himanshu" <hshah@ciena.com>,  "Thomas D. Nadeau" <tnadeau@lucidvision.com>, Sam Aldrin <aldrin.ietf@gmail.com>
Thread-Topic: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Date: Thu, 20 Nov 2014 19:15:33 +0000
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Cc: Ronald Bonica <rbonica@juniper.net>, "mpls@ietf.org" <mpls@ietf.org>
Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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From: Sam Aldrin <aldrin.ietf@gmail.com>
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To: Shahram Davari <davari@broadcom.com>
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Cc: "mpls@ietf.org" <mpls@ietf.org>, Ronald Bonica <rbonica@juniper.net>
Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Hi Nobo,

[without shooting the messenger]

In addition to what you listed, would like to see details on how  this =
ID will improve the performance at Egress should be clarified.
i.e. IP routing Vs OAM process (w/o FEC validation). Also, how this =
model helps if reverse IP path is not available (inter-domain, reverse =
path broken, non-routable ingress IP address) and to what gain?

There are many ways the LSP ping is being used, both as proprietary and =
also part of eco system.
If we go by the logic that this ID is needed, we will have slew of new =
ID=E2=80=99s detailing different usage models.

Hence, I totally agree with what Shahram and others have indicated.

-sam

> On Nov 20, 2014, at 11:15 AM, Shahram Davari <davari@broadcom.com> =
wrote:
>=20
> Hi,
>=20
> Since the procedures in this draft generates and processes the test =
packets on the same router and since other routers just forward =
normally,  why do we even need a draft? There is no interoperability =
requirements, and each vendor can implement what they like.
> =20
> Thanks
> Shahram
> =20
> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Nobo Akiya =
(nobo)
> Sent: Thursday, November 20, 2014 10:57 AM
> To: Shah, Himanshu; Thomas D. Nadeau; Sam Aldrin
> Cc: Ronald Bonica; mpls@ietf.org
> Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments =
from the mike
> =20
> Hi,
> =20
> Sort of summarizing what=E2=80=99s been stated but here=E2=80=99s my =
observation of draft-bonica-mpls-self-ping.
> =20
> 1.       LSP Ping and BFD MPLS already do what is being proposed.
> 2.       Ron needs a mechanism that is more efficient on egress LSRs, =
with respect to resources and operational aspects.
> 3.       Any probe packet having destination IP address as the ingress =
LSR has limitations in terms of how effective it can verify the DP =
readiness.
> 4.       The proposal by Ron is limited to those LSPs that signal via =
ordered mode (ex: LDP independent mode will not work) - same problem as =
(3).
> =20
> If the intent of draft-bonica-mpls-self-ping is just to document what =
has been implemented or what is being implemented, I=E2=80=99d like to =
request followings to be captured in the document.
> -          limitations (3 and 4) so that readers are aware of them.
> -          usage of non-127/8 address as destination IP address in =
MPLS echo request/reply deviates from RFC4379.
> =20
> If the intent of draft-bonica-mpls-self-ping is to advocate a =
mechanism for efficient MPLS DP readiness test, and I=E2=80=99d like to =
request that:
> -          requirements (2) are well captured.
> -          S-BFD be evaluated (as it addresses the efficiency =
requirements and does not have limitations described by 3 and 4).
> =20
> Himanshu, I have one comment in-line below. Please look for [NOBO].
> =20
> =20
> From: mpls [mailto:mpls-bounces@ietf.org =
<mailto:mpls-bounces@ietf.org>] On Behalf Of Shah, Himanshu
> Sent: Thursday, November 20, 2014 10:36 AM
> To: Thomas D. Nadeau; Sam Aldrin
> Cc: Ronald Bonica; mpls@ietf.org <mailto:mpls@ietf.org>
> Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments =
from the mike
> =20
> This is exactly what I said at Mic.
> We have been deploying MPLS for a while and if such DP active =
verification was necessary, vendors have solved it without
> standard specific solution, may that be BFD or self-ping.
> =20
> One of the argument made was that client BFD session detects that =
=E2=80=9Ctunnel is active but DP is not=E2=80=9D.
> Does it imply there is some kind of UNI signaling going on between PE =
and CE to indicate that tunnel has become
> active, commence data? And the idea is that PE will refrain =
notification until self-ping verify DP active?
> =20
> If that is not the case then this technique is not even useful =E2=80=93=
 self ping is not actually causing the DP to become active,
> If it doesn=E2=80=99t become active in the time window, what is PE =
going to do?
> =20
> [NOBO] That is another interesting aspect of the whole solution. =
However, I believe that the problem scope of this document is much =
smaller: ingress LSR to detect readiness of RSVP signaled LSP. For RSVP =
signaled LSP, only the LSP that is =E2=80=9Cpassing the test=E2=80=9D =
can be tied to the tunnel as the active LSP, so at least the ingress LSR =
will not pump traffic into the tunnel without knowing whether DP =
end-to-end is ready or not. Assuming that there are other ways to get to =
the egress LSR from this ingress LSR, then the problem is solved. =
Otherwise the ingress LSR will drop the traffic but the problem is =
contained to that network node (i.e. packets are not traversing un-ready =
LSP).
> =20
> Thanks!
> =20
> -Nobo
> =20
> =20
> /himanshu
> =20
> From: mpls [mailto:mpls-bounces@ietf.org =
<mailto:mpls-bounces@ietf.org>] On Behalf Of Thomas D. Nadeau
> Sent: Thursday, November 20, 2014 9:43 AM
> To: Sam Aldrin
> Cc: Ronald Bonica; mpls@ietf.org <mailto:mpls@ietf.org>
> Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments =
from the mike
> =20
>            =20
>             To me what is described in the draft seems like this is a =
description of a device/vendor feature that automates the basic =
procedures of 4379/etc.. This can and has been done for quite some time =
using other means such as onboard automated scripts/actions after paths =
are established/signaled. I say this not to be glib, but because I built =
such a thing about 10 years ago that has been deployed widely.  Also, as =
Sam says, there is some deviation from RFC4379 which we should ask is =
worth the additional complication (and required implementation + =
associated delay/etc...) versus just using the existing means.=20
> =20
>             The bottom line is that we should be asking ourselves =
whether or not this something we really need to standardize.
> =20
>             =E2=80=94Tom
> =20
> =20
> =20
> On Nov 19, 2014:10:28 PM, at 10:28 PM, Sam Aldrin =
<aldrin.ietf@gmail.com <mailto:aldrin.ietf@gmail.com>> wrote:
> =20
> Hi Ron,
> =20
> Still trying to understand the need for the draft, hence, have few of =
questions and need clarifications. Appreciate your response in advance.
> =20
> 1. (clarification q) The Ingress LSR sends the Echo request, with =
destination IP address to self, and forwards to Egress LSR (sec 2), =
correct?  Is this the only thing which identifies the Ingress LSR or =
something else too?
> 2. What happens if there is LSP breakage or something and the Echo =
request ends up on transit LSR? Doesn't it process? I see that draft =
says, this will avoid control plane processing. How so? The packet is =
forwarded from ingress to egress, which means, the egress will have to =
process the packet i.e. look up the ip address to send it back to =
ingress.
> =20
> Draft says "The egress LSR forwards the MPLS Echo message to its =
destination, the
>    ingress LSR.  The egress LSR forwards the MPLS Echo message exactly
>    as it would forward any other packet."
> =20
> Could you explain, how egress forwards the packet back to ingress w/o =
looking up the packet IP header i.e. in the data plane and no additional =
control plane of OAM process?
> 3. Is the assertion that, if Echo Reply is received back at the =
ingress then it is failure, rather it should receive Echo Request back =
at Ingress, correct?
> 4. Why can't you use LSP proxy ping to self via Egress?
> =20
> Will followup with additional questions, if any, based on your =
responses.
> =20
> cheers
> -sam
> =20
> On Nov 19, 2014, at 8:38 AM, Ronald Bonica <rbonica@juniper.net =
<mailto:rbonica@juniper.net>> wrote:
> =20
> Folks
>=20
> At IETF 91, the following points were raised with regard to =
draft-bonica-mpls-self-ping:
>=20
> 1) Why not use BFD?
> 2) Self-ping does not diagnose FIB programming errors in which an LSR =
other than the egress de-encapsulates and forwards the packet.
> 3) How does Self ping verify a bidirectional LSP's readiness to carry =
traffic in both directions?
> 4) Why does MPLS Self ping use MPLS Echo packets, as opposed to ICMP =
echo packets or some other packet format?
>=20
> Responses follow:
>=20
> 1) Why not use BFD?
>=20
> Self Ping is an extremely light-weight protocol. A typical Self Ping =
session emits one or two packets and terminates less than one second =
after initiation. Self-ping requires no configuration or control plane =
resources on the egress LSR.=20
>=20
> By contrast, BFD is designed to verify bi-directional connectivity =
over a longer period of time. Therefore, MPLS Self Ping is appropriate =
in environments where BFD is too resource intensive.
>=20
> 2) Self-ping does not diagnose programming errors in which an LSR =
other than the egress de-encapsulates and forwards the packet.
>=20
> Self Ping is designed to verify LSP readiness without consuming =
control plane resources on the egress router. It is not designed to =
diagnose programming errors in which an LSR other than the egress =
de-encapsulates and forwards the packet. Mechanisms that diagnose such =
issues are available [RFC 4950]. However, they are more resource =
intensive.
>=20
> 3) How does Self ping verify a bidirectional LSP's readiness to carry =
traffic in both directions?
>=20
> In order to verify bidirectional LSP readiness, RSVP instantiates two =
LSP Self Ping sessions, one at each end of the LSP. The LSR at one end =
of the LSP initiates a self ping session when it receives a RESV =
message. The LSR at the other end of the LSP initiates a Self Ping =
Session when it sends a RESV message. Each LSP endpoint forwards traffic =
over the LSP only after the LSP Self Ping session terminates =
successfully
>=20
> 4) Why does LSP Self Ping use MPLS Echo packets, as opposed to some =
other packet format?
>=20
> LSP Self Ping could have used many packet formats. The only hard =
requirement was to have one 64-bit field in which the 64 bit session =
identifier could be encoded. The MPLS Echo packet was convenient because =
its Senders Handle is 64-bits long.=20
>=20
> I will update the draft to reflect this information.
>=20
> Ron Bonica
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org <mailto:mpls@ietf.org>
> https://www.ietf.org/mailman/listinfo/mpls =
<https://www.ietf.org/mailman/listinfo/mpls>
> =20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org <mailto:mpls@ietf.org>
> https://www.ietf.org/mailman/listinfo/mpls =
<https://www.ietf.org/mailman/listinfo/mpls>

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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Hi Nobo,<div class=3D""><br class=3D""></div><div =
class=3D"">[without shooting the messenger]</div><div class=3D""><br =
class=3D""></div><div class=3D"">In addition to what you listed, would =
like to see details on how &nbsp;this ID will improve the performance at =
Egress should be clarified.</div><div class=3D"">i.e. IP routing Vs OAM =
process (w/o FEC validation). Also, how this model helps if reverse IP =
path is not available (inter-domain, reverse path broken, non-routable =
ingress IP address) and to what gain?</div><div class=3D""><br =
class=3D""></div><div class=3D"">There are many ways the LSP ping is =
being used, both as proprietary and also part of eco system.</div><div =
class=3D"">If we go by the logic that this ID is needed, we will have =
slew of new ID=E2=80=99s detailing different usage models.</div><div =
class=3D""><br class=3D""></div><div class=3D"">Hence, I totally agree =
with what Shahram and others have indicated.</div><div class=3D""><br =
class=3D""></div><div class=3D"">-sam</div><div class=3D""><br =
class=3D""></div><div><blockquote type=3D"cite" class=3D""><div =
class=3D"">On Nov 20, 2014, at 11:15 AM, Shahram Davari &lt;<a =
href=3D"mailto:davari@broadcom.com" class=3D"">davari@broadcom.com</a>&gt;=
 wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; line-height: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;"><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">Hi,<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D""><br=
 class=3D"">Since the procedures in this draft generates and processes =
the test packets on the same router and since other routers just forward =
normally, &nbsp;why do we even need a draft? There is no =
interoperability requirements, and each vendor can implement what they =
like.<o:p class=3D""></o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;</span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">Thanks<o:p class=3D""></o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">Shahram<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">&nbsp;</span></div><div class=3D""><div =
style=3D"border-style: solid none none; border-top-color: rgb(181, 196, =
223); border-top-width: 1pt; padding: 3pt 0in 0in;" class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><b class=3D""><span style=3D"font-size: =
10pt; font-family: Tahoma, sans-serif;" class=3D"">From:</span></b><span =
style=3D"font-size: 10pt; font-family: Tahoma, sans-serif;" =
class=3D""><span class=3D"Apple-converted-space">&nbsp;</span>mpls [<a =
href=3D"mailto:mpls-bounces@ietf.org" =
class=3D"">mailto:mpls-bounces@ietf.org</a>]<span =
class=3D"Apple-converted-space">&nbsp;</span><b class=3D"">On Behalf =
Of<span class=3D"Apple-converted-space">&nbsp;</span></b>Nobo Akiya =
(nobo)<br class=3D""><b class=3D"">Sent:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Thursday, November 20, 2014 =
10:57 AM<br class=3D""><b class=3D"">To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Shah, Himanshu; Thomas D. =
Nadeau; Sam Aldrin<br class=3D""><b class=3D"">Cc:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Ronald Bonica; <a =
href=3D"mailto:mpls@ietf.org" class=3D"">mpls@ietf.org</a><br =
class=3D""><b class=3D"">Subject:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Re: [mpls] =
draft-bonica-mpls-self-ping: Response to comments from the mike<o:p =
class=3D""></o:p></span></div></div></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">Hi,<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;</span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">Sort of summarizing what=E2=80=99s been stated but here=E2=80=99=
s my observation of draft-bonica-mpls-self-ping.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;</span></div><div =
style=3D"margin: 0in 0in 0.0001pt 0.5in; font-size: 12pt; font-family: =
'Times New Roman', serif; text-indent: -0.25in;" class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><span class=3D"">1.<span =
style=3D"font-style: normal; font-variant: normal; font-weight: normal; =
font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">LSP Ping and BFD MPLS =
already do what is being proposed.<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt 0.5in; font-size: 12pt; font-family: =
'Times New Roman', serif; text-indent: -0.25in;" class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><span class=3D"">2.<span =
style=3D"font-style: normal; font-variant: normal; font-weight: normal; =
font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">Ron needs a mechanism =
that is more efficient on egress LSRs, with respect to resources and =
operational aspects.<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt 0.5in; font-size: 12pt; font-family: =
'Times New Roman', serif; text-indent: -0.25in;" class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><span class=3D"">3.<span =
style=3D"font-style: normal; font-variant: normal; font-weight: normal; =
font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">Any probe packet having =
destination IP address as the ingress LSR has limitations in terms of =
how effective it can verify the DP readiness.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt =
0.5in; font-size: 12pt; font-family: 'Times New Roman', serif; =
text-indent: -0.25in;" class=3D""><span lang=3D"EN-CA" style=3D"font-size:=
 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><span class=3D"">4.<span style=3D"font-style: normal; =
font-variant: normal; font-weight: normal; font-size: 7pt; line-height: =
normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">The proposal by Ron is =
limited to those LSPs that signal via ordered mode (ex: LDP independent =
mode will not work) - same problem as (3).<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;</span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">If the intent of draft-bonica-mpls-self-ping is just to =
document what has been implemented or what is being implemented, I=E2=80=99=
d like to request followings to be captured in the document.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt =
0.5in; font-size: 12pt; font-family: 'Times New Roman', serif; =
text-indent: -0.25in;" class=3D""><span lang=3D"EN-CA" style=3D"font-size:=
 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><span class=3D"">-<span style=3D"font-style: normal; =
font-variant: normal; font-weight: normal; font-size: 7pt; line-height: =
normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">limitations (3 and 4) =
so that readers are aware of them.<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt 0.5in; font-size: 12pt; font-family: =
'Times New Roman', serif; text-indent: -0.25in;" class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><span class=3D"">-<span =
style=3D"font-style: normal; font-variant: normal; font-weight: normal; =
font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">usage of non-127/8 =
address as destination IP address in MPLS echo request/reply deviates =
from RFC4379.<o:p class=3D""></o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">If the intent of =
draft-bonica-mpls-self-ping is to advocate a mechanism for efficient =
MPLS DP readiness test, and I=E2=80=99d like to request that:<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt =
0.5in; font-size: 12pt; font-family: 'Times New Roman', serif; =
text-indent: -0.25in;" class=3D""><span lang=3D"EN-CA" style=3D"font-size:=
 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><span class=3D"">-<span style=3D"font-style: normal; =
font-variant: normal; font-weight: normal; font-size: 7pt; line-height: =
normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">requirements (2) are =
well captured.<o:p class=3D""></o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt 0.5in; font-size: 12pt; font-family: 'Times New Roman', =
serif; text-indent: -0.25in;" class=3D""><span lang=3D"EN-CA" =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D""><span class=3D"">-<span style=3D"font-style:=
 normal; font-variant: normal; font-weight: normal; font-size: 7pt; =
line-height: normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">S-BFD be evaluated (as =
it addresses the efficiency requirements and does not have limitations =
described by 3 and 4).<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">Himanshu, I have one =
comment in-line below. Please look for [NOBO].<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;</span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span></div><div style=3D"border-style: none none none =
solid; border-left-color: blue; border-left-width: 1.5pt; padding: 0in =
0in 0in 4pt;" class=3D""><div class=3D""><div style=3D"border-style: =
solid none none; border-top-color: rgb(181, 196, 223); border-top-width: =
1pt; padding: 3pt 0in 0in;" class=3D""><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><b class=3D""><span style=3D"font-size: 10pt; font-family: =
Tahoma, sans-serif;" class=3D"">From:</span></b><span style=3D"font-size: =
10pt; font-family: Tahoma, sans-serif;" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>mpls [<a =
href=3D"mailto:mpls-bounces@ietf.org" style=3D"color: purple; =
text-decoration: underline;" =
class=3D"">mailto:mpls-bounces@ietf.org</a>]<span =
class=3D"Apple-converted-space">&nbsp;</span><b class=3D"">On Behalf =
Of<span class=3D"Apple-converted-space">&nbsp;</span></b>Shah, =
Himanshu<br class=3D""><b class=3D"">Sent:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Thursday, November 20, 2014 =
10:36 AM<br class=3D""><b class=3D"">To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Thomas D. Nadeau; Sam =
Aldrin<br class=3D""><b class=3D"">Cc:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Ronald Bonica;<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:mpls@ietf.org" style=3D"color: purple; text-decoration: =
underline;" class=3D"">mpls@ietf.org</a><br class=3D""><b =
class=3D"">Subject:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Re: [mpls] =
draft-bonica-mpls-self-ping: Response to comments from the mike<o:p =
class=3D""></o:p></span></div></div></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span lang=3D"EN-CA" class=3D"">&nbsp;</span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><i class=3D""><span style=3D"font-size: =
11pt; font-family: Cambria, serif; color: rgb(0, 64, 192);" =
class=3D"">This is exactly what I said at Mic.<o:p =
class=3D""></o:p></span></i></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><i class=3D""><span style=3D"font-size: 11pt; font-family: =
Cambria, serif; color: rgb(0, 64, 192);" class=3D"">We have been =
deploying MPLS for a while and if such DP active verification was =
necessary, vendors have solved it without<o:p =
class=3D""></o:p></span></i></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><i class=3D""><span style=3D"font-size: 11pt; font-family: =
Cambria, serif; color: rgb(0, 64, 192);" class=3D"">standard specific =
solution, may that be BFD or self-ping.<o:p =
class=3D""></o:p></span></i></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><i class=3D""><span style=3D"font-size: 11pt; font-family: =
Cambria, serif; color: rgb(0, 64, 192);" =
class=3D"">&nbsp;</span></i></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><i class=3D""><span style=3D"font-size: 11pt; font-family: =
Cambria, serif; color: rgb(0, 64, 192);" class=3D"">One of the argument =
made was that client BFD session detects that =E2=80=9Ctunnel is active =
but DP is not=E2=80=9D.<o:p class=3D""></o:p></span></i></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><i class=3D""><span style=3D"font-size: =
11pt; font-family: Cambria, serif; color: rgb(0, 64, 192);" =
class=3D"">Does it imply there is some kind of UNI signaling going on =
between PE and CE to indicate that tunnel has become<o:p =
class=3D""></o:p></span></i></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><i class=3D""><span style=3D"font-size: 11pt; font-family: =
Cambria, serif; color: rgb(0, 64, 192);" class=3D"">active, commence =
data? And the idea is that PE will refrain notification until self-ping =
verify DP active?<o:p class=3D""></o:p></span></i></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><i class=3D""><span style=3D"font-size: =
11pt; font-family: Cambria, serif; color: rgb(0, 64, 192);" =
class=3D"">&nbsp;</span></i></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><i class=3D""><span style=3D"font-size: 11pt; font-family: =
Cambria, serif; color: rgb(0, 64, 192);" class=3D"">If that is not the =
case then this technique is not even useful =E2=80=93 self ping is not =
actually causing the DP to become active,<o:p =
class=3D""></o:p></span></i></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><i class=3D""><span style=3D"font-size: 11pt; font-family: =
Cambria, serif; color: rgb(0, 64, 192);" class=3D"">If it doesn=E2=80=99t =
become active in the time window, what is PE going to do?<o:p =
class=3D""></o:p></span></i></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><i class=3D""><span style=3D"font-size: 11pt; font-family: =
Cambria, serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span></i></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">[NOBO] That is another =
interesting aspect of the whole solution. However, I believe that the =
problem scope of this document is much smaller: ingress LSR to detect =
readiness of RSVP signaled LSP. For RSVP signaled LSP, only the LSP that =
is =E2=80=9Cpassing the test=E2=80=9D can be tied to the tunnel as the =
active LSP, so at least the ingress LSR will not pump traffic into the =
tunnel without knowing whether DP end-to-end is ready or not. Assuming =
that there are other ways to get to the egress LSR from this ingress =
LSR, then the problem is solved. Otherwise the ingress LSR will drop the =
traffic but the problem is contained to that network node (i.e. packets =
are not traversing un-ready LSP).<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">Thanks!<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;</span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">-Nobo<o:p class=3D""></o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;</span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><i =
class=3D""><span style=3D"font-size: 11pt; font-family: Cambria, serif; =
color: rgb(0, 64, 192);" class=3D"">/himanshu<o:p =
class=3D""></o:p></span></i></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><i class=3D""><span style=3D"font-size: 11pt; font-family: =
Cambria, serif; color: rgb(0, 64, 192);" =
class=3D"">&nbsp;</span></i></div><div class=3D""><div =
style=3D"border-style: solid none none; border-top-color: rgb(181, 196, =
223); border-top-width: 1pt; padding: 3pt 0in 0in;" class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><b class=3D""><span style=3D"font-size: =
10pt; font-family: Tahoma, sans-serif;" class=3D"">From:</span></b><span =
style=3D"font-size: 10pt; font-family: Tahoma, sans-serif;" =
class=3D""><span class=3D"Apple-converted-space">&nbsp;</span>mpls [<a =
href=3D"mailto:mpls-bounces@ietf.org" style=3D"color: purple; =
text-decoration: underline;" =
class=3D"">mailto:mpls-bounces@ietf.org</a>]<span =
class=3D"Apple-converted-space">&nbsp;</span><b class=3D"">On Behalf =
Of<span class=3D"Apple-converted-space">&nbsp;</span></b>Thomas D. =
Nadeau<br class=3D""><b class=3D"">Sent:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Thursday, November 20, 2014 =
9:43 AM<br class=3D""><b class=3D"">To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Sam Aldrin<br class=3D""><b =
class=3D"">Cc:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Ronald Bonica;<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:mpls@ietf.org" style=3D"color: purple; text-decoration: =
underline;" class=3D"">mpls@ietf.org</a><br class=3D""><b =
class=3D"">Subject:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Re: [mpls] =
draft-bonica-mpls-self-ping: Response to comments from the mike<o:p =
class=3D""></o:p></span></div></div></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span =
class=3D"apple-tab-span">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span><o:p =
class=3D""></o:p></div><div class=3D""><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span =
class=3D"apple-tab-span">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span>To me what is =
described in the draft seems like this is a description of a =
device/vendor feature that automates the basic procedures of 4379/etc.. =
This can and has been done for quite some time using other means such as =
onboard automated scripts/actions after paths are established/signaled. =
I say this not to be glib, but because I built such a thing about 10 =
years ago that has been deployed widely. &nbsp;Also, as Sam says, there =
is some deviation from RFC4379 which we should ask is worth the =
additional complication (and required implementation + associated =
delay/etc...) versus just using the existing means.&nbsp;<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span =
class=3D"apple-tab-span">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span>The bottom line is =
that we should be asking ourselves whether or not this something we =
really need to standardize.<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span =
class=3D"apple-tab-span">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span>=E2=80=94Tom<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div><div =
class=3D""><blockquote style=3D"margin-top: 5pt; margin-bottom: 5pt;" =
class=3D""><div class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D"">On =
Nov 19, 2014:10:28 PM, at 10:28 PM, Sam Aldrin &lt;<a =
href=3D"mailto:aldrin.ietf@gmail.com" style=3D"color: purple; =
text-decoration: underline;" class=3D"">aldrin.ietf@gmail.com</a>&gt; =
wrote:<o:p class=3D""></o:p></div></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D"">Hi Ron,<o:p =
class=3D""></o:p></div><div class=3D""><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Still trying to understand the need for =
the draft, hence, have few of questions and need clarifications. =
Appreciate your response in advance.<o:p class=3D""></o:p></div></div><div=
 class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">1. (clarification q) The Ingress LSR sends the Echo =
request, with destination IP address to self, and forwards to Egress LSR =
(sec 2), correct? &nbsp;Is this the only thing which identifies the =
Ingress LSR or something else too?<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D"">2. What happens if =
there is LSP breakage or something and the Echo request ends up on =
transit LSR? Doesn't it process? I see that draft says, this will avoid =
control plane processing. How so? The packet is forwarded from ingress =
to egress, which means, the egress will have to process the packet i.e. =
look up the ip address to send it back to ingress.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Draft says "<span style=3D"font-size: =
10pt;" class=3D"">The egress LSR forwards the MPLS Echo message to its =
destination, the</span><o:p class=3D""></o:p></div></div><pre =
style=3D"margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: =
'Courier New'; line-height: 14.4pt;" class=3D"">&nbsp;&nbsp; ingress =
LSR.&nbsp; The egress LSR forwards the MPLS Echo message exactly<o:p =
class=3D""></o:p></pre><pre style=3D"margin: 0in 0in 0.0001pt; =
font-size: 10pt; font-family: 'Courier New'; line-height: 14.4pt;" =
class=3D"">&nbsp;&nbsp; as it would forward any other packet."<o:p =
class=3D""></o:p></pre><pre style=3D"margin: 0in 0in 0.0001pt; =
font-size: 10pt; font-family: 'Courier New'; line-height: 14.4pt;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></pre><pre style=3D"margin: 0in =
0in 0.0001pt; font-size: 10pt; font-family: 'Courier New'; line-height: =
14.4pt;" class=3D"">Could you explain, how egress forwards the packet =
back to ingress w/o looking up the packet IP header i.e. in the data =
plane and no additional control plane of OAM process?<o:p =
class=3D""></o:p></pre><div class=3D""><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">3. Is the assertion that, if Echo Reply is received back at =
the ingress then it is failure, rather it should receive Echo Request =
back at Ingress, correct?<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D"">4. Why can't you use =
LSP proxy ping to self via Egress?<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">Will followup with additional questions, if any, =
based on your responses.<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">cheers<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D"">-sam<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div class=3D""><blockquote =
style=3D"margin-top: 5pt; margin-bottom: 5pt;" class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D"">On Nov 19, 2014, at =
8:38 AM, Ronald Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" =
style=3D"color: purple; text-decoration: underline;" =
class=3D"">rbonica@juniper.net</a>&gt; wrote:<o:p =
class=3D""></o:p></div></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">Folks<br class=3D""><br class=3D"">At IETF 91, the following =
points were raised with regard to draft-bonica-mpls-self-ping:<br =
class=3D""><br class=3D"">1) Why not use BFD?<br class=3D"">2) Self-ping =
does not diagnose FIB programming errors in which an LSR other than the =
egress de-encapsulates and forwards the packet.<br class=3D"">3) How =
does Self ping verify a bidirectional LSP's readiness to carry traffic =
in both directions?<br class=3D"">4) Why does MPLS Self ping use MPLS =
Echo packets, as opposed to ICMP echo packets or some other packet =
format?<br class=3D""><br class=3D"">Responses follow:<br class=3D""><br =
class=3D"">1) Why not use BFD?<br class=3D""><br class=3D"">Self Ping is =
an extremely light-weight protocol. A typical Self Ping session emits =
one or two packets and terminates less than one second after initiation. =
Self-ping requires no configuration or control plane resources on the =
egress LSR.<span class=3D"Apple-converted-space">&nbsp;</span><br =
class=3D""><br class=3D"">By contrast, BFD is designed to verify =
bi-directional connectivity over a longer period of time. Therefore, =
MPLS Self Ping is appropriate in environments where BFD is too resource =
intensive.<br class=3D""><br class=3D"">2) Self-ping does not diagnose =
programming errors in which an LSR other than the egress de-encapsulates =
and forwards the packet.<br class=3D""><br class=3D"">Self Ping is =
designed to verify LSP readiness without consuming control plane =
resources on the egress router. It is not designed to diagnose =
programming errors in which an LSR other than the egress de-encapsulates =
and forwards the packet. Mechanisms that diagnose such issues are =
available [RFC 4950]. However, they are more resource intensive.<br =
class=3D""><br class=3D"">3) How does Self ping verify a bidirectional =
LSP's readiness to carry traffic in both directions?<br class=3D""><br =
class=3D"">In order to verify bidirectional LSP readiness, RSVP =
instantiates two LSP Self Ping sessions, one at each end of the LSP. The =
LSR at one end of the LSP initiates a self ping session when it receives =
a RESV message. The LSR at the other end of the LSP initiates a Self =
Ping Session when it sends a RESV message. Each LSP endpoint forwards =
traffic over the LSP only after the LSP Self Ping session terminates =
successfully<br class=3D""><br class=3D"">4) Why does LSP Self Ping use =
MPLS Echo packets, as opposed to some other packet format?<br =
class=3D""><br class=3D"">LSP Self Ping could have used many packet =
formats. The only hard requirement was to have one 64-bit field in which =
the 64 bit session identifier could be encoded. The MPLS Echo packet was =
convenient because its Senders Handle is 64-bits long.<span =
class=3D"Apple-converted-space">&nbsp;</span><br class=3D""><br =
class=3D"">I will update the draft to reflect this information.<br =
class=3D""><br class=3D"">Ron Bonica<br class=3D""><br =
class=3D"">_______________________________________________<br =
class=3D"">mpls mailing list<br class=3D""><a =
href=3D"mailto:mpls@ietf.org" style=3D"color: purple; text-decoration: =
underline;" class=3D"">mpls@ietf.org</a><br class=3D""><a =
href=3D"https://www.ietf.org/mailman/listinfo/mpls" style=3D"color: =
purple; text-decoration: underline;" =
class=3D"">https://www.ietf.org/mailman/listinfo/mpls</a><o:p =
class=3D""></o:p></div></div></blockquote></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" =
class=3D"">_______________________________________________<br =
class=3D"">mpls mailing list<br class=3D""><a =
href=3D"mailto:mpls@ietf.org" style=3D"color: purple; text-decoration: =
underline;" class=3D"">mpls@ietf.org</a><br class=3D""><a =
href=3D"https://www.ietf.org/mailman/listinfo/mpls" style=3D"color: =
purple; text-decoration: underline;" =
class=3D"">https://www.ietf.org/mailman/listinfo/mpls</a></div></div></blo=
ckquote></div></div></div></div></div></blockquote></div><br =
class=3D""></body></html>=

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From: "Nobo Akiya (nobo)" <nobo@cisco.com>
To: Sam Aldrin <aldrin.ietf@gmail.com>, Shahram Davari <davari@broadcom.com>
Thread-Topic: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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To: "Nobo Akiya (nobo)" <nobo@cisco.com>, Sam Aldrin <aldrin.ietf@gmail.com>,  Shahram Davari <davari@broadcom.com>
Date: Thu, 20 Nov 2014 19:04:49 -0500
Thread-Topic: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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From nobody Thu Nov 20 17:54:57 2014
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Date: Fri, 21 Nov 2014 09:54:41 +0800
From: Loa Andersson <loa@pi.nu>
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Subject: Re: [mpls] maturity of the MRT technology
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Alia,

Thanks for helpful information. We will go ahead with the mpls-rt review
and unless the we hear anything to the contrary from the rtgwg-chairs
also go ahead with the working group adoption poll (modulo the mpls-rt
review outcome).

/Loa

On 2014-11-21 02:17, Alia Atlas wrote:
> Loa,
>
> Without any hats on, I would note:
>
> a) As far as I'm aware, this has seen two independent prototypes
> implemented.
> b) I have not heard any concrete technical concerns.  Stewart and I did
> specificallly
> discuss MRT this past IETF.  I am, of course, quite interested in
> hearing any
> concrete technical concerns.
>
> c) I'd be happy seeing this question asked of more drafts :-)
>
> Regards,
> Alia
>
>
> On Tue, Nov 18, 2014 at 7:08 PM, Loa Andersson <loa@pi.nu
> <mailto:loa@pi.nu>> wrote:
>
>     Working Groups,
>
>     We have don an MPLS-RT of draft-atlas-mpls-ldp-mrt, the reviews has been
>     posted to the mpls wg mailing list.
>
>     In his MPLS-RT review Stewart Bryant says:
>
>     "I have concerns about whether or not MRT technology has the  maturity
>       expected in the standards track. However that decision needs to be
>       taken in RTGWG and MPLS needs to follow their and lead in determining
>       the fate and track of this draft. This draft should not be published
>       ahead of the drafts that define the technology that it is supporting."
>
>     He also says that he see no reason not to go ahead and start the poll to
>     see if we have consensus to adopt the document as an mpls wg document.
>
>     The question Stewart ask is valid, and we'd like input from the rtgwg
>     and rtgwg chairs (copied on this mail). We will also copy both the
>     poll for adoption and the wglc to the rtgwg mailing list.
>
>     /Loa
>     mpls wg co-chair
>     --
>
>
>     Loa Andersson                        email: loa@mail01.huawei.com
>     <mailto:loa@mail01.huawei.com>
>     Senior MPLS Expert loa@pi.nu <mailto:loa@pi.nu>
>     Huawei Technologies (consultant)     phone: +46 739 81 21 64
>     <tel:%2B46%20739%2081%2021%2064>
>
>     _________________________________________________
>     rtgwg mailing list
>     rtgwg@ietf.org <mailto:rtgwg@ietf.org>
>     https://www.ietf.org/mailman/__listinfo/rtgwg
>     <https://www.ietf.org/mailman/listinfo/rtgwg>
>
>

-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


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From: <stephane.litkowski@orange.com>
To: Alia Atlas <akatlas@gmail.com>, Loa Andersson <loa@pi.nu>
Thread-Topic: maturity of the MRT technology
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From: "Wunan (Eric)" <eric.wu@huawei.com>
To: "stephane.litkowski@orange.com" <stephane.litkowski@orange.com>, "Alia Atlas" <akatlas@gmail.com>, Loa Andersson <loa@pi.nu>
Thread-Topic: maturity of the MRT technology
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Date: Fri, 21 Nov 2014 10:27:22 +0000
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Subject: Re: [mpls] maturity of the MRT technology
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From nobody Fri Nov 21 03:50:15 2014
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Date: Fri, 21 Nov 2014 11:49:58 +0000
From: Stewart Bryant <stbryant@cisco.com>
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To: Alia Atlas <akatlas@gmail.com>, Loa Andersson <loa@pi.nu>
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Cc: "mpls@ietf.org" <mpls@ietf.org>, "mpls-chairs@tools.ietf.org" <mpls-chairs@tools.ietf.org>, draft-atlas-mpls-ldp-mrt@tools.ietf.org, "rtgwg@ietf.org" <rtgwg@ietf.org>
Subject: Re: [mpls] maturity of the MRT technology
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My comment to Loa precedes a discussion with Alia at IETF
and to be fair I do not know of any technical issue with the MRT
design.

Unlike LF and RLFA which are "local" to the point of repair, the
scope of MRT is domain wide, in other words MRT is introducing
a new partially ships in the night routing protocol. In my view, a
domain wide system has a higher barrier to entry than a local
repair system.

I have a concern that Loa's statement (a) only tells part of the
story. Whilst I understand there are two independent prototypes,
I understand that they are not two interworking prototypes since
they are based on different link state protocols. However I
understand (and it would be good to have this verified) that if
they are given the same topology they produce the same FIB.
To my mind this ranks it at "one and a half" independent
prototypes.

At the end of the day the utility of MRT depends on who is
interested in deploying it, and as far as I know, none of the
domain wide IPFRR solutions have made it into production networks.
If there are operators prepared to deploy MRT  in their production
networks then obviously it is headed for the standards track.
If it is destined to join the  ranks of the many "possible" domain
wide solutions, then it is clearly still at the informational/
experimental stage of its life.

Stewart



On 20/11/2014 18:17, Alia Atlas wrote:
> Loa,
>
> Without any hats on, I would note:
>
> a) As far as I'm aware, this has seen two independent prototypes 
> implemented.
> b) I have not heard any concrete technical concerns. Stewart and I did 
> specificallly
> discuss MRT this past IETF.  I am, of course, quite interested in 
> hearing any
> concrete technical concerns.
>
> c) I'd be happy seeing this question asked of more drafts :-)
>
> Regards,
> Alia
>
>
> On Tue, Nov 18, 2014 at 7:08 PM, Loa Andersson <loa@pi.nu 
> <mailto:loa@pi.nu>> wrote:
>
>     Working Groups,
>
>     We have don an MPLS-RT of draft-atlas-mpls-ldp-mrt, the reviews
>     has been
>     posted to the mpls wg mailing list.
>
>     In his MPLS-RT review Stewart Bryant says:
>
>     "I have concerns about whether or not MRT technology has the  maturity
>      expected in the standards track. However that decision needs to be
>      taken in RTGWG and MPLS needs to follow their and lead in determining
>      the fate and track of this draft. This draft should not be published
>      ahead of the drafts that define the technology that it is
>     supporting."
>
>     He also says that he see no reason not to go ahead and start the
>     poll to
>     see if we have consensus to adopt the document as an mpls wg document.
>
>     The question Stewart ask is valid, and we'd like input from the rtgwg
>     and rtgwg chairs (copied on this mail). We will also copy both the
>     poll for adoption and the wglc to the rtgwg mailing list.
>
>     /Loa
>     mpls wg co-chair
>     -- 
>
>
>     Loa Andersson                        email: loa@mail01.huawei.com
>     <mailto:loa@mail01.huawei.com>
>     Senior MPLS Expert loa@pi.nu <mailto:loa@pi.nu>
>     Huawei Technologies (consultant)     phone: +46 739 81 21 64
>     <tel:%2B46%20739%2081%2021%2064>
>
>     _______________________________________________
>     rtgwg mailing list
>     rtgwg@ietf.org <mailto:rtgwg@ietf.org>
>     https://www.ietf.org/mailman/listinfo/rtgwg
>
>
>
>
> _______________________________________________
> rtgwg mailing list
> rtgwg@ietf.org
> https://www.ietf.org/mailman/listinfo/rtgwg


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    <div class="moz-cite-prefix">My comment to Loa precedes a discussion
      with Alia at IETF<br>
      and to be fair I do not know of any technical issue with the MRT<br>
      design. <br>
      <br>
      Unlike LF and RLFA which are "local" to the point of repair, the <br>
      scope of MRT is domain wide, in other words MRT is introducing <br>
      a new partially ships in the night routing protocol. In my view, a
      <br>
      domain wide system has a higher barrier to entry than a local <br>
      repair system. <br>
      <br>
      I have a concern that Loa's statement (a) only tells part of the <br>
      story. Whilst I understand there are two independent prototypes,<br>
      I understand that they are not two interworking prototypes since<br>
      they are based on different link state protocols. However I <br>
      understand (and it would be good to have this verified) that if <br>
      they are given the same topology they produce the same FIB.<br>
      To my mind this ranks it at "one and a half" independent<br>
      prototypes.<br>
      <br>
      At the end of the day
      <meta http-equiv="content-type" content="text/html;
        charset=ISO-8859-1">
      the utility of MRT depends on who is<br>
      interested in deploying it, and as far as I know, none of the <br>
      domain wide IPFRR solutions have made it into production networks.
      <br>
      If there are operators prepared to deploy MRT&nbsp; in their production
      <br>
      networks then obviously it is headed for the standards track. <br>
      If it is destined to join the&nbsp; ranks of the many "possible" domain<br>
      wide solutions, then it is clearly still at the informational/<br>
      experimental stage of its life.<br>
      <br>
      Stewart<br>
      <br>
      <br>
      <br>
      On 20/11/2014 18:17, Alia Atlas wrote:<br>
    </div>
    <blockquote
cite="mid:CAG4d1rfRuyzJS9HjHN_yH69PGa_V=iPeyvxxxFUyKMK_gUqBhA@mail.gmail.com"
      type="cite">
      <meta http-equiv="Content-Type" content="text/html;
        charset=ISO-8859-1">
      <div dir="ltr">Loa,
        <div><br>
        </div>
        <div>Without any hats on, I would note:</div>
        <div><br>
        </div>
        <div>a) As far as I'm aware, this has seen two independent
          prototypes implemented.</div>
        <div>b) I have not heard any concrete technical concerns.&nbsp;
          Stewart and I did specificallly</div>
        <div>discuss MRT this past IETF.&nbsp; I am, of course, quite
          interested in hearing any</div>
        <div>concrete technical concerns.</div>
        <div><br>
        </div>
        <div>c) I'd be happy seeing this question asked of more drafts
          :-)</div>
        <div><br>
        </div>
        <div>Regards,</div>
        <div>Alia</div>
        <div><br>
        </div>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Tue, Nov 18, 2014 at 7:08 PM, Loa
          Andersson <span dir="ltr">&lt;<a moz-do-not-send="true"
              href="mailto:loa@pi.nu" target="_blank">loa@pi.nu</a>&gt;</span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">Working
            Groups,<br>
            <br>
            We have don an MPLS-RT of draft-atlas-mpls-ldp-mrt, the
            reviews has been<br>
            posted to the mpls wg mailing list.<br>
            <br>
            In his MPLS-RT review Stewart Bryant says:<br>
            <br>
            "I have concerns about whether or not MRT technology has
            the&nbsp; maturity<br>
            &nbsp;expected in the standards track. However that decision
            needs to be<br>
            &nbsp;taken in RTGWG and MPLS needs to follow their and lead in
            determining<br>
            &nbsp;the fate and track of this draft. This draft should not be
            published<br>
            &nbsp;ahead of the drafts that define the technology that it is
            supporting."<br>
            <br>
            He also says that he see no reason not to go ahead and start
            the poll to<br>
            see if we have consensus to adopt the document as an mpls wg
            document.<br>
            <br>
            The question Stewart ask is valid, and we'd like input from
            the rtgwg<br>
            and rtgwg chairs (copied on this mail). We will also copy
            both the<br>
            poll for adoption and the wglc to the rtgwg mailing list.<br>
            <br>
            /Loa<br>
            mpls wg co-chair<span class="HOEnZb"><font color="#888888"><br>
                -- <br>
                <br>
                <br>
                Loa Andersson&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; email: <a
                  moz-do-not-send="true"
                  href="mailto:loa@mail01.huawei.com" target="_blank">loa@mail01.huawei.com</a><br>
                Senior MPLS Expert&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a
                  moz-do-not-send="true" href="mailto:loa@pi.nu"
                  target="_blank">loa@pi.nu</a><br>
                Huawei Technologies (consultant)&nbsp; &nbsp; &nbsp;phone: <a
                  moz-do-not-send="true"
                  href="tel:%2B46%20739%2081%2021%2064"
                  value="+46739812164" target="_blank">+46 739 81 21 64</a><br>
                <br>
                _______________________________________________<br>
                rtgwg mailing list<br>
                <a moz-do-not-send="true" href="mailto:rtgwg@ietf.org"
                  target="_blank">rtgwg@ietf.org</a><br>
                <a moz-do-not-send="true"
                  href="https://www.ietf.org/mailman/listinfo/rtgwg"
                  target="_blank">https://www.ietf.org/mailman/listinfo/rtgwg</a><br>
              </font></span></blockquote>
        </div>
        <br>
      </div>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">_______________________________________________
rtgwg mailing list
<a class="moz-txt-link-abbreviated" href="mailto:rtgwg@ietf.org">rtgwg@ietf.org</a>
<a class="moz-txt-link-freetext" href="https://www.ietf.org/mailman/listinfo/rtgwg">https://www.ietf.org/mailman/listinfo/rtgwg</a>
</pre>
    </blockquote>
    <br>
    <br>
    <pre class="moz-signature" cols="72">-- 
For corporate legal information go to:

<a class="moz-txt-link-freetext" href="http://www.cisco.com/web/about/doing_business/legal/cri/index.html">http://www.cisco.com/web/about/doing_business/legal/cri/index.html</a>

</pre>
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--------------080303080702030808080804--


From nobody Fri Nov 21 08:58:35 2014
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From: "Adrian Farrel" <adrian@olddog.co.uk>
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Date: Fri, 21 Nov 2014 16:58:21 -0000
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Subject: [mpls] Dataplane implications of MPLS encryption
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Hi,

I would appreciate thoughts form those of you that work in the dataplane.

What are the consequences of our proposals in
http://datatracker.ietf.org/doc/draft-farrelll-mpls-opportunistic-encrypt/ for
the dataplane?

Questions include:
- whether we could encrypt and decrypt using existing hardware and at line speed
- whether inserting two labels and a control word would be practical (this
happens
  at LSP ingress where other labels are also added)
- whether stripping labels and moving on to the real LSP work at the egress is
   practical

Ultimately, the consideration is whether the benefit of this approach justifies
the cost.

Thanks,
Adrian


From nobody Fri Nov 21 11:36:59 2014
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From: Ronald Bonica <rbonica@juniper.net>
To: Sam Aldrin <aldrin.ietf@gmail.com>
Thread-Topic: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Cc: "mpls@ietf.org" <mpls@ietf.org>
Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Hi Sam,

Response inline......

From: Sam Aldrin [mailto:aldrin.ietf@gmail.com]
Sent: Wednesday, November 19, 2014 10:28 PM
To: Ronald Bonica
Cc: mpls@ietf.org
Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from =
the mike

Hi Ron,

Still trying to understand the need for the draft, hence, have few of quest=
ions and need clarifications. Appreciate your response in advance.


1.      (clarification q) The Ingress LSR sends the Echo request, with dest=
ination IP address to self, and forwards to Egress LSR (sec 2), correct?
[RPB]  Almost. The Ingress LSR sends the Echo *Reply*, with destination IP =
address to self, and forwards to Egress LSR.


2.        Is this the only thing which identifies the Ingress LSR or someth=
ing else too?
[RPB] The egress LSR doesn't need to identify the ingress LSR. It just forw=
ards an IP packet based upon IP destination. The Ingress LSR identifies the=
 Echo Reply as one that it sent to itself by matching the Sender Handle in =
the message with an LSP Ping Session ID.


3.      What happens if there is LSP breakage or something and the Echo req=
uest ends up on transit LSR? Doesn't it process?
[RPB] The transit LSR forwards the Echo Reply back to the ingress. The ingr=
ess declares the LSP to be ready to carry traffic, even though it is broken=
. That's why my original message says, "Self Ping is designed to verify LSP=
 readiness without consuming control plane resources on the egress router. =
It is not designed to diagnose programming errors in which an LSR other tha=
n the egress de-encapsulates and forwards the packet. Mechanisms that diagn=
ose such issues are available [RFC 4950]. However, they are more resource i=
ntensive."

I see that draft says, this will avoid control plane processing. How so?
[RPB] The draft says that it avoids control plane processing on the egress =
router. The egress router never looks beyond the IP header. It simply forwa=
rds based upon IP destination.

The packet is forwarded from ingress to egress, which means, the egress wil=
l have to process the packet i.e. look up the ip address to send it back to=
 ingress.
[RPB] Yes. This happens on the forwarding plane.

Draft says "The egress LSR forwards the MPLS Echo message to its destinatio=
n, the

   ingress LSR.  The egress LSR forwards the MPLS Echo message exactly

   as it would forward any other packet."



Could you explain, how egress forwards the packet back to ingress w/o looki=
ng up the packet IP header i.e. in the data plane and no additional control=
 plane of OAM process?



4.      Is the assertion that, if Echo Reply is received back at the ingres=
s then it is failure, rather it should receive Echo Request back at Ingress=
, correct?
[RPB] Exactly the opposite! If the Echo reply is received at the ingress, t=
hat is success


5.      Why can't you use LSP proxy ping to self via Egress?

[RPB] The procedures described in Section 3.2.1 of draft-ietf-mpls-proxy-ls=
p-ping consume control plane resources on the egress LSR.



                                ROn


Will followup with additional questions, if any, based on your responses.

cheers
-sam

On Nov 19, 2014, at 8:38 AM, Ronald Bonica <rbonica@juniper.net<mailto:rbon=
ica@juniper.net>> wrote:

Folks

At IETF 91, the following points were raised with regard to draft-bonica-mp=
ls-self-ping:

1) Why not use BFD?
2) Self-ping does not diagnose FIB programming errors in which an LSR other=
 than the egress de-encapsulates and forwards the packet.
3) How does Self ping verify a bidirectional LSP's readiness to carry traff=
ic in both directions?
4) Why does MPLS Self ping use MPLS Echo packets, as opposed to ICMP echo p=
ackets or some other packet format?

Responses follow:

1) Why not use BFD?

Self Ping is an extremely light-weight protocol. A typical Self Ping sessio=
n emits one or two packets and terminates less than one second after initia=
tion. Self-ping requires no configuration or control plane resources on the=
 egress LSR.

By contrast, BFD is designed to verify bi-directional connectivity over a l=
onger period of time. Therefore, MPLS Self Ping is appropriate in environme=
nts where BFD is too resource intensive.

2) Self-ping does not diagnose programming errors in which an LSR other tha=
n the egress de-encapsulates and forwards the packet.

Self Ping is designed to verify LSP readiness without consuming control pla=
ne resources on the egress router. It is not designed to diagnose programmi=
ng errors in which an LSR other than the egress de-encapsulates and forward=
s the packet. Mechanisms that diagnose such issues are available [RFC 4950]=
. However, they are more resource intensive.

3) How does Self ping verify a bidirectional LSP's readiness to carry traff=
ic in both directions?

In order to verify bidirectional LSP readiness, RSVP instantiates two LSP S=
elf Ping sessions, one at each end of the LSP. The LSR at one end of the LS=
P initiates a self ping session when it receives a RESV message. The LSR at=
 the other end of the LSP initiates a Self Ping Session when it sends a RES=
V message. Each LSP endpoint forwards traffic over the LSP only after the L=
SP Self Ping session terminates successfully

4) Why does LSP Self Ping use MPLS Echo packets, as opposed to some other p=
acket format?

LSP Self Ping could have used many packet formats. The only hard requiremen=
t was to have one 64-bit field in which the 64 bit session identifier could=
 be encoded. The MPLS Echo packet was convenient because its Senders Handle=
 is 64-bits long.

I will update the draft to reflect this information.

Ron Bonica

_______________________________________________
mpls mailing list
mpls@ietf.org<mailto:mpls@ietf.org>
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D">Hi Sam,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D">Response inline&#8230;&#8230;<o:p></o=
:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif"> Sam Aldrin [mailto:aldrin.ietf=
@gmail.com]
<br>
<b>Sent:</b> Wednesday, November 19, 2014 10:28 PM<br>
<b>To:</b> Ronald Bonica<br>
<b>Cc:</b> mpls@ietf.org<br>
<b>Subject:</b> Re: [mpls] draft-bonica-mpls-self-ping: Response to comment=
s from the mike<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Hi Ron,<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Still trying to understand the need for the draft, h=
ence, have few of questions and need clarifications. Appreciate your respon=
se in advance.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">1.<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>(clarification q) The Ingress LSR sends the Echo re=
quest, with destination IP address to self, and forwards to Egress LSR (sec=
 2), correct?<span style=3D"color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1F497D">[RPB]
</span></i></b>&nbsp;Almost. The Ingress LSR sends the Echo *<b>Reply</b>*,=
 with destination IP address to self, and forwards to Egress LSR.<o:p></o:p=
></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">2.<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>&nbsp;&nbsp;Is this the only thing which identifies=
 the Ingress LSR or something else too?<o:p></o:p></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1F497D">[RPB] The egress LSR doesn&#821=
7;t need to identify the ingress LSR. It just forwards an IP packet based u=
pon IP destination. The Ingress LSR identifies the Echo
 Reply as one that it sent to itself by matching the Sender Handle in the m=
essage with an LSP Ping Session ID.
<o:p></o:p></span></i></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoListParagraph" style=3D"margin-left:41.25pt;text-indent:-.25=
in;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style=3D"mso-list:Ignore">3.<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>What happens if there is LSP breakage or something =
and the Echo request ends up on transit LSR? Doesn't it process?
<span style=3D"color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1F497D">[RPB] The transit LSR forwards =
the Echo Reply back to the ingress. The ingress declares the LSP to be read=
y to carry traffic, even though it is broken.
 That&#8217;s why my original message says, </span></i></b><b><i><span styl=
e=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F4=
E79;mso-style-textfill-fill-color:#1F4E79;mso-style-textfill-fill-alpha:100=
.0%">&#8220;</span></i></b><span style=3D"font-size:11.0pt;font-family:&quo=
t;Calibri&quot;,sans-serif;color:#1F4E79;mso-style-textfill-fill-color:#1F4=
E79;mso-style-textfill-fill-alpha:100.0%">Self
 Ping is designed to verify LSP readiness without consuming control plane r=
esources on the egress router. It is not designed to diagnose programming e=
rrors in which an LSR other than the egress de-encapsulates and forwards th=
e packet. Mechanisms that diagnose
 such issues are available [RFC 4950]. However, they are more resource inte=
nsive.&#8221;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></i></b=
></p>
<p class=3D"MsoNormal">I see that draft says, this will avoid control plane=
 processing. How so?<span style=3D"color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1F497D">[RPB] The draft says that it av=
oids control plane processing on the egress router. The egress router never=
 looks beyond the IP header. It simply forwards
 based upon IP destination.<o:p></o:p></span></i></b></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></i></b=
></p>
<p class=3D"MsoNormal">The packet is forwarded from ingress to egress, whic=
h means, the egress will have to process the packet i.e. look up the ip add=
ress to send it back to ingress.<o:p></o:p></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1F497D">[RPB] Yes. This happens on the =
forwarding plane.</span></i></b><span style=3D"font-size:11.0pt;font-family=
:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Draft says &quot;<span style=3D"font-size:10.0pt">Th=
e egress LSR forwards the MPLS Echo message to its destination, the</span><=
o:p></o:p></p>
</div>
<pre style=3D"line-height:14.4pt">&nbsp;&nbsp; ingress LSR.&nbsp; The egres=
s LSR forwards the MPLS Echo message exactly<o:p></o:p></pre>
<pre style=3D"line-height:14.4pt">&nbsp;&nbsp; as it would forward any othe=
r packet.&quot;<o:p></o:p></pre>
<pre style=3D"line-height:14.4pt"><o:p>&nbsp;</o:p></pre>
<pre style=3D"line-height:14.4pt">Could you explain, how egress forwards th=
e packet back to ingress w/o looking up the packet IP header i.e. in the da=
ta plane and no additional control plane of OAM process?<span style=3D"colo=
r:#1F497D"><o:p></o:p></span></pre>
<pre style=3D"line-height:14.4pt"><span style=3D"font-size:11.0pt;font-fami=
ly:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></=
pre>
<div>
<p class=3D"MsoListParagraph" style=3D"margin-left:41.25pt;text-indent:-.25=
in;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style=3D"mso-list:Ignore">4.<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Is the assertion that, if Echo Reply is received ba=
ck at the ingress then it is failure, rather it should receive Echo Request=
 back at Ingress, correct?<span style=3D"color:#1F497D"><o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1F497D">[RPB] Exactly the opposite! If =
the Echo reply is received at the ingress, that is success<o:p></o:p></span=
></i></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoListParagraph" style=3D"margin-left:41.25pt;text-indent:-.25=
in;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style=3D"mso-list:Ignore">5.<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Why can't you use LSP proxy ping to self via Egress=
?<span style=3D"color:#1F497D"><o:p></o:p></span></p>
<pre style=3D"line-height:14.4pt"><b><i><span style=3D"font-size:11.0pt;fon=
t-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">[RPB] The procedures=
 described in Section 3.2.1 of </span></i></b><span style=3D"color:black">d=
raft-ietf-mpls-proxy-lsp-ping consume control plane resources on the egress=
 LSR.<o:p></o:p></span></pre>
<pre style=3D"line-height:14.4pt"><span style=3D"color:black"><o:p>&nbsp;</=
o:p></span></pre>
<pre style=3D"line-height:14.4pt"><span style=3D"color:black">&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp; ROn<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Will followup with additional questions, if any, bas=
ed on your responses.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">cheers<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">-sam<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal">On Nov 19, 2014, at 8:38 AM, Ronald Bonica &lt;<a hr=
ef=3D"mailto:rbonica@juniper.net">rbonica@juniper.net</a>&gt; wrote:<o:p></=
o:p></p>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal">Folks<br>
<br>
At IETF 91, the following points were raised with regard to draft-bonica-mp=
ls-self-ping:<br>
<br>
1) Why not use BFD?<br>
2) Self-ping does not diagnose FIB programming errors in which an LSR other=
 than the egress de-encapsulates and forwards the packet.<br>
3) How does Self ping verify a bidirectional LSP's readiness to carry traff=
ic in both directions?<br>
4) Why does MPLS Self ping use MPLS Echo packets, as opposed to ICMP echo p=
ackets or some other packet format?<br>
<br>
Responses follow:<br>
<br>
1) Why not use BFD?<br>
<br>
Self Ping is an extremely light-weight protocol. A typical Self Ping sessio=
n emits one or two packets and terminates less than one second after initia=
tion. Self-ping requires no configuration or control plane resources on the=
 egress LSR.
<br>
<br>
By contrast, BFD is designed to verify bi-directional connectivity over a l=
onger period of time. Therefore, MPLS Self Ping is appropriate in environme=
nts where BFD is too resource intensive.<br>
<br>
2) Self-ping does not diagnose programming errors in which an LSR other tha=
n the egress de-encapsulates and forwards the packet.<br>
<br>
Self Ping is designed to verify LSP readiness without consuming control pla=
ne resources on the egress router. It is not designed to diagnose programmi=
ng errors in which an LSR other than the egress de-encapsulates and forward=
s the packet. Mechanisms that diagnose
 such issues are available [RFC 4950]. However, they are more resource inte=
nsive.<br>
<br>
3) How does Self ping verify a bidirectional LSP's readiness to carry traff=
ic in both directions?<br>
<br>
In order to verify bidirectional LSP readiness, RSVP instantiates two LSP S=
elf Ping sessions, one at each end of the LSP. The LSR at one end of the LS=
P initiates a self ping session when it receives a RESV message. The LSR at=
 the other end of the LSP initiates
 a Self Ping Session when it sends a RESV message. Each LSP endpoint forwar=
ds traffic over the LSP only after the LSP Self Ping session terminates suc=
cessfully<br>
<br>
4) Why does LSP Self Ping use MPLS Echo packets, as opposed to some other p=
acket format?<br>
<br>
LSP Self Ping could have used many packet formats. The only hard requiremen=
t was to have one 64-bit field in which the 64 bit session identifier could=
 be encoded. The MPLS Echo packet was convenient because its Senders Handle=
 is 64-bits long.
<br>
<br>
I will update the draft to reflect this information.<br>
<br>
Ron Bonica<br>
<br>
_______________________________________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls">https://www.ietf.org=
/mailman/listinfo/mpls</a><o:p></o:p></p>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
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From: Ronald Bonica <rbonica@juniper.net>
To: Sam Aldrin <aldrin.ietf@gmail.com>
Thread-Topic: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Sam,

Exactly! LSP Ping and LSP Self-ping, are different protocols from one anoth=
er. LSP Self-Ping is not an extension to LSP Ping. Although the two protoco=
ls share a common message format, they listen for input on different UDP po=
rts. LSP Ping executes one set of procedures in response to input, while LS=
P Self-ping executes an entirely different set of procedures.

                                                                           =
    Ron


From: Sam Aldrin [mailto:aldrin.ietf@gmail.com]
Sent: Wednesday, November 19, 2014 10:39 PM
To: Ronald Bonica
Cc: mpls@ietf.org
Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from =
the mike

BTW, the draft also proposes the IP destination as routable address and not=
 local host address.
This is re-defining the semantics defined in RFC4379.
Secondly, as mentioned earlier, when there is LSP failure, the packet will =
be routed to destination address, as Echo request. which in this case is in=
gress LSR.

-sam
On Nov 19, 2014, at 7:28 PM, Sam Aldrin <aldrin.ietf@gmail.com<mailto:aldri=
n.ietf@gmail.com>> wrote:

Hi Ron,

Still trying to understand the need for the draft, hence, have few of quest=
ions and need clarifications. Appreciate your response in advance.

1. (clarification q) The Ingress LSR sends the Echo request, with destinati=
on IP address to self, and forwards to Egress LSR (sec 2), correct?  Is thi=
s the only thing which identifies the Ingress LSR or something else too?
2. What happens if there is LSP breakage or something and the Echo request =
ends up on transit LSR? Doesn't it process? I see that draft says, this wil=
l avoid control plane processing. How so? The packet is forwarded from ingr=
ess to egress, which means, the egress will have to process the packet i.e.=
 look up the ip address to send it back to ingress.

Draft says "The egress LSR forwards the MPLS Echo message to its destinatio=
n, the

   ingress LSR.  The egress LSR forwards the MPLS Echo message exactly

   as it would forward any other packet."



Could you explain, how egress forwards the packet back to ingress w/o looki=
ng up the packet IP header i.e. in the data plane and no additional control=
 plane of OAM process?
3. Is the assertion that, if Echo Reply is received back at the ingress the=
n it is failure, rather it should receive Echo Request back at Ingress, cor=
rect?
4. Why can't you use LSP proxy ping to self via Egress?

Will followup with additional questions, if any, based on your responses.

cheers
-sam

On Nov 19, 2014, at 8:38 AM, Ronald Bonica <rbonica@juniper.net<mailto:rbon=
ica@juniper.net>> wrote:

Folks

At IETF 91, the following points were raised with regard to draft-bonica-mp=
ls-self-ping:

1) Why not use BFD?
2) Self-ping does not diagnose FIB programming errors in which an LSR other=
 than the egress de-encapsulates and forwards the packet.
3) How does Self ping verify a bidirectional LSP's readiness to carry traff=
ic in both directions?
4) Why does MPLS Self ping use MPLS Echo packets, as opposed to ICMP echo p=
ackets or some other packet format?

Responses follow:

1) Why not use BFD?

Self Ping is an extremely light-weight protocol. A typical Self Ping sessio=
n emits one or two packets and terminates less than one second after initia=
tion. Self-ping requires no configuration or control plane resources on the=
 egress LSR.

By contrast, BFD is designed to verify bi-directional connectivity over a l=
onger period of time. Therefore, MPLS Self Ping is appropriate in environme=
nts where BFD is too resource intensive.

2) Self-ping does not diagnose programming errors in which an LSR other tha=
n the egress de-encapsulates and forwards the packet.

Self Ping is designed to verify LSP readiness without consuming control pla=
ne resources on the egress router. It is not designed to diagnose programmi=
ng errors in which an LSR other than the egress de-encapsulates and forward=
s the packet. Mechanisms that diagnose such issues are available [RFC 4950]=
. However, they are more resource intensive.

3) How does Self ping verify a bidirectional LSP's readiness to carry traff=
ic in both directions?

In order to verify bidirectional LSP readiness, RSVP instantiates two LSP S=
elf Ping sessions, one at each end of the LSP. The LSR at one end of the LS=
P initiates a self ping session when it receives a RESV message. The LSR at=
 the other end of the LSP initiates a Self Ping Session when it sends a RES=
V message. Each LSP endpoint forwards traffic over the LSP only after the L=
SP Self Ping session terminates successfully

4) Why does LSP Self Ping use MPLS Echo packets, as opposed to some other p=
acket format?

LSP Self Ping could have used many packet formats. The only hard requiremen=
t was to have one 64-bit field in which the 64 bit session identifier could=
 be encoded. The MPLS Echo packet was convenient because its Senders Handle=
 is 64-bits long.

I will update the draft to reflect this information.

Ron Bonica

_______________________________________________
mpls mailing list
mpls@ietf.org<mailto:mpls@ietf.org>
https://www.ietf.org/mailman/listinfo/mpls



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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D">Sam,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D">Exactly! LSP Ping and LSP Self-ping, =
are different protocols from one another. LSP Self-Ping is not an extension=
 to LSP Ping. Although the two protocols share
 a common message format, they listen for input on different UDP ports. LSP=
 Ping executes one set of procedures in response to input, while LSP Self-p=
ing executes an entirely different set of procedures.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ron<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif"> Sam Aldrin [mailto:aldrin.ietf=
@gmail.com]
<br>
<b>Sent:</b> Wednesday, November 19, 2014 10:39 PM<br>
<b>To:</b> Ronald Bonica<br>
<b>Cc:</b> mpls@ietf.org<br>
<b>Subject:</b> Re: [mpls] draft-bonica-mpls-self-ping: Response to comment=
s from the mike<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">BTW, the draft also proposes the IP destination as r=
outable address and not local host address.<o:p></o:p></p>
<div>
<p class=3D"MsoNormal">This is re-defining the semantics defined in RFC4379=
.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Secondly, as mentioned earlier, when there is LSP fa=
ilure, the packet will be routed to destination address, as Echo request. w=
hich in this case is ingress LSR.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">-sam<o:p></o:p></p>
<div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal">On Nov 19, 2014, at 7:28 PM, Sam Aldrin &lt;<a href=
=3D"mailto:aldrin.ietf@gmail.com">aldrin.ietf@gmail.com</a>&gt; wrote:<o:p>=
</o:p></p>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal">Hi Ron,<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Still trying to understand the need for the draft, h=
ence, have few of questions and need clarifications. Appreciate your respon=
se in advance.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">1. (clarification q) The Ingress LSR sends the Echo =
request, with destination IP address to self, and forwards to Egress LSR (s=
ec 2), correct? &nbsp;Is this the only thing which identifies the Ingress L=
SR or something else too?<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">2. What happens if there is LSP breakage or somethin=
g and the Echo request ends up on transit LSR? Doesn't it process? I see th=
at draft says, this will avoid control plane processing. How so? The packet=
 is forwarded from ingress to egress,
 which means, the egress will have to process the packet i.e. look up the i=
p address to send it back to ingress.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Draft says &quot;<span style=3D"font-size:10.0pt">Th=
e egress LSR forwards the MPLS Echo message to its destination, the</span><=
o:p></o:p></p>
</div>
<pre style=3D"line-height:14.4pt">&nbsp;&nbsp; ingress LSR.&nbsp; The egres=
s LSR forwards the MPLS Echo message exactly<o:p></o:p></pre>
<pre style=3D"line-height:14.4pt">&nbsp;&nbsp; as it would forward any othe=
r packet.&quot;<o:p></o:p></pre>
<pre style=3D"line-height:14.4pt"><o:p>&nbsp;</o:p></pre>
<pre style=3D"line-height:14.4pt">Could you explain, how egress forwards th=
e packet back to ingress w/o looking up the packet IP header i.e. in the da=
ta plane and no additional control plane of OAM process?<o:p></o:p></pre>
<div>
<p class=3D"MsoNormal">3. Is the assertion that, if Echo Reply is received =
back at the ingress then it is failure, rather it should receive Echo Reque=
st back at Ingress, correct?<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">4. Why can't you use LSP proxy ping to self via Egre=
ss?<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Will followup with additional questions, if any, bas=
ed on your responses.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">cheers<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">-sam<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal">On Nov 19, 2014, at 8:38 AM, Ronald Bonica &lt;<a hr=
ef=3D"mailto:rbonica@juniper.net">rbonica@juniper.net</a>&gt; wrote:<o:p></=
o:p></p>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal">Folks<br>
<br>
At IETF 91, the following points were raised with regard to draft-bonica-mp=
ls-self-ping:<br>
<br>
1) Why not use BFD?<br>
2) Self-ping does not diagnose FIB programming errors in which an LSR other=
 than the egress de-encapsulates and forwards the packet.<br>
3) How does Self ping verify a bidirectional LSP's readiness to carry traff=
ic in both directions?<br>
4) Why does MPLS Self ping use MPLS Echo packets, as opposed to ICMP echo p=
ackets or some other packet format?<br>
<br>
Responses follow:<br>
<br>
1) Why not use BFD?<br>
<br>
Self Ping is an extremely light-weight protocol. A typical Self Ping sessio=
n emits one or two packets and terminates less than one second after initia=
tion. Self-ping requires no configuration or control plane resources on the=
 egress LSR.
<br>
<br>
By contrast, BFD is designed to verify bi-directional connectivity over a l=
onger period of time. Therefore, MPLS Self Ping is appropriate in environme=
nts where BFD is too resource intensive.<br>
<br>
2) Self-ping does not diagnose programming errors in which an LSR other tha=
n the egress de-encapsulates and forwards the packet.<br>
<br>
Self Ping is designed to verify LSP readiness without consuming control pla=
ne resources on the egress router. It is not designed to diagnose programmi=
ng errors in which an LSR other than the egress de-encapsulates and forward=
s the packet. Mechanisms that diagnose
 such issues are available [RFC 4950]. However, they are more resource inte=
nsive.<br>
<br>
3) How does Self ping verify a bidirectional LSP's readiness to carry traff=
ic in both directions?<br>
<br>
In order to verify bidirectional LSP readiness, RSVP instantiates two LSP S=
elf Ping sessions, one at each end of the LSP. The LSR at one end of the LS=
P initiates a self ping session when it receives a RESV message. The LSR at=
 the other end of the LSP initiates
 a Self Ping Session when it sends a RESV message. Each LSP endpoint forwar=
ds traffic over the LSP only after the LSP Self Ping session terminates suc=
cessfully<br>
<br>
4) Why does LSP Self Ping use MPLS Echo packets, as opposed to some other p=
acket format?<br>
<br>
LSP Self Ping could have used many packet formats. The only hard requiremen=
t was to have one 64-bit field in which the 64 bit session identifier could=
 be encoded. The MPLS Echo packet was convenient because its Senders Handle=
 is 64-bits long.
<br>
<br>
I will update the draft to reflect this information.<br>
<br>
Ron Bonica<br>
<br>
_______________________________________________<br>
mpls mailing list<br>
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<a href=3D"https://www.ietf.org/mailman/listinfo/mpls">https://www.ietf.org=
/mailman/listinfo/mpls</a><o:p></o:p></p>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
</div>
</body>
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To: Ronald Bonica <rbonica@juniper.net>
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Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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> On Nov 21, 2014:5:06 PM, at 5:06 PM, Ronald Bonica =
<rbonica@juniper.net> wrote:
>=20
> Tom,
> =20
> You make a valid observation. LSP Self Ping is akin to GRE keep-alive. =
An ingress device sends a message to itself through the tunnel under =
test. The egress device simply forwards the message back to the ingress, =
based upon its IP destination. The egress device never even looks beyond =
the IP header.
> =20
> The ingress device consumes the message that it produced. Because the =
ingress is both producer and consumer of the message, there are no =
interoperability requirements. Each ingress device could use a different =
message format, so long as the message contains enough information to =
associate it with an LSP Self-ping session.
> =20
> Because there are no interoperability requirements between the ingress =
and egress, it not necessary to publish a document on the standards =
track.
> =20
> However, LSP Self-ping procedures entirely local to the ingress =
router. The ingress router sends messages off the box that might be =
detected by counters, firewalls, intrusion detection devices, etc. =
Therefore, it is appropriate to publish an INFORMATION RFC explaining =
what this extra OAM traffic is.

	I agree, Informational is cool.

	=E2=80=94Tom


> =20
>                                                                        =
                    Ron
> =20
> =20
> From: Thomas D. Nadeau [mailto:tnadeau@lucidvision.com =
<mailto:tnadeau@lucidvision.com>]=20
> Sent: Thursday, November 20, 2014 9:43 AM
> To: Sam Aldrin
> Cc: Ronald Bonica; mpls@ietf.org <mailto:mpls@ietf.org>
> Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments =
from the mike
> =20
>          =20
>           To me what is described in the draft seems like this is a =
description of a device/vendor feature that automates the basic =
procedures of 4379/etc.. This can and has been done for quite some time =
using other means such as onboard automated scripts/actions after paths =
are established/signaled. I say this not to be glib, but because I built =
such a thing about 10 years ago that has been deployed widely.  Also, as =
Sam says, there is some deviation from RFC4379 which we should ask is =
worth the additional complication (and required implementation + =
associated delay/etc...) versus just using the existing means.=20
> =20
>           The bottom line is that we should be asking ourselves =
whether or not this something we really need to standardize.
> =20
>           =E2=80=94Tom
> =20
> =20
> =20
> On Nov 19, 2014:10:28 PM, at 10:28 PM, Sam Aldrin =
<aldrin.ietf@gmail.com <mailto:aldrin.ietf@gmail.com>> wrote:
> =20
> Hi Ron,
> =20
> Still trying to understand the need for the draft, hence, have few of =
questions and need clarifications. Appreciate your response in advance.
> =20
> 1. (clarification q) The Ingress LSR sends the Echo request, with =
destination IP address to self, and forwards to Egress LSR (sec 2), =
correct?  Is this the only thing which identifies the Ingress LSR or =
something else too?
> 2. What happens if there is LSP breakage or something and the Echo =
request ends up on transit LSR? Doesn't it process? I see that draft =
says, this will avoid control plane processing. How so? The packet is =
forwarded from ingress to egress, which means, the egress will have to =
process the packet i.e. look up the ip address to send it back to =
ingress.
> =20
> Draft says "The egress LSR forwards the MPLS Echo message to its =
destination, the
>    ingress LSR.  The egress LSR forwards the MPLS Echo message exactly
>    as it would forward any other packet."
> =20
> Could you explain, how egress forwards the packet back to ingress w/o =
looking up the packet IP header i.e. in the data plane and no additional =
control plane of OAM process?
> 3. Is the assertion that, if Echo Reply is received back at the =
ingress then it is failure, rather it should receive Echo Request back =
at Ingress, correct?
> 4. Why can't you use LSP proxy ping to self via Egress?
> =20
> Will followup with additional questions, if any, based on your =
responses.
> =20
> cheers
> -sam
> =20
> On Nov 19, 2014, at 8:38 AM, Ronald Bonica <rbonica@juniper.net =
<mailto:rbonica@juniper.net>> wrote:
> =20
> Folks
>=20
> At IETF 91, the following points were raised with regard to =
draft-bonica-mpls-self-ping:
>=20
> 1) Why not use BFD?
> 2) Self-ping does not diagnose FIB programming errors in which an LSR =
other than the egress de-encapsulates and forwards the packet.
> 3) How does Self ping verify a bidirectional LSP's readiness to carry =
traffic in both directions?
> 4) Why does MPLS Self ping use MPLS Echo packets, as opposed to ICMP =
echo packets or some other packet format?
>=20
> Responses follow:
>=20
> 1) Why not use BFD?
>=20
> Self Ping is an extremely light-weight protocol. A typical Self Ping =
session emits one or two packets and terminates less than one second =
after initiation. Self-ping requires no configuration or control plane =
resources on the egress LSR.=20
>=20
> By contrast, BFD is designed to verify bi-directional connectivity =
over a longer period of time. Therefore, MPLS Self Ping is appropriate =
in environments where BFD is too resource intensive.
>=20
> 2) Self-ping does not diagnose programming errors in which an LSR =
other than the egress de-encapsulates and forwards the packet.
>=20
> Self Ping is designed to verify LSP readiness without consuming =
control plane resources on the egress router. It is not designed to =
diagnose programming errors in which an LSR other than the egress =
de-encapsulates and forwards the packet. Mechanisms that diagnose such =
issues are available [RFC 4950]. However, they are more resource =
intensive.
>=20
> 3) How does Self ping verify a bidirectional LSP's readiness to carry =
traffic in both directions?
>=20
> In order to verify bidirectional LSP readiness, RSVP instantiates two =
LSP Self Ping sessions, one at each end of the LSP. The LSR at one end =
of the LSP initiates a self ping session when it receives a RESV =
message. The LSR at the other end of the LSP initiates a Self Ping =
Session when it sends a RESV message. Each LSP endpoint forwards traffic =
over the LSP only after the LSP Self Ping session terminates =
successfully
>=20
> 4) Why does LSP Self Ping use MPLS Echo packets, as opposed to some =
other packet format?
>=20
> LSP Self Ping could have used many packet formats. The only hard =
requirement was to have one 64-bit field in which the 64 bit session =
identifier could be encoded. The MPLS Echo packet was convenient because =
its Senders Handle is 64-bits long.=20
>=20
> I will update the draft to reflect this information.
>=20
> Ron Bonica
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org <mailto:mpls@ietf.org>
> https://www.ietf.org/mailman/listinfo/mpls =
<https://www.ietf.org/mailman/listinfo/mpls>
> =20
> _______________________________________________
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> https://www.ietf.org/mailman/listinfo/mpls =
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><br class=3D""><div><blockquote type=3D"cite" class=3D""><div =
class=3D"">On Nov 21, 2014:5:06 PM, at 5:06 PM, Ronald Bonica &lt;<a =
href=3D"mailto:rbonica@juniper.net" class=3D"">rbonica@juniper.net</a>&gt;=
 wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; font-family: =
Helvetica; font-size: 16px; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; line-height: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;"><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">Tom,<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">You make a valid observation. LSP Self =
Ping is akin to GRE keep-alive. An ingress device sends a message to =
itself through the tunnel under test. The egress device simply forwards =
the message back to the ingress, based upon its IP destination. The =
egress device never even looks beyond the IP header.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">&nbsp;</span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">The ingress device =
consumes the message that it produced. Because the ingress is both =
producer and consumer of the message, there are no interoperability =
requirements. Each ingress device could use a different message format, =
so long as the message contains enough information to associate it with =
an LSP Self-ping session.<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">Because there are no interoperability =
requirements between the ingress and egress, it not necessary to publish =
a document on the standards track.<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">However, LSP Self-ping procedures entirely =
local to the ingress router. The ingress router sends messages off the =
box that might be detected by counters, firewalls, intrusion detection =
devices, etc. Therefore, it is appropriate to publish an INFORMATION RFC =
explaining what this extra OAM traffic =
is.</span></div></div></div></blockquote><div><br class=3D""></div><span =
class=3D"Apple-tab-span" style=3D"white-space:pre">	</span>I agree, =
Informational is cool.</div><div><br class=3D""></div><div><span =
class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>=E2=80=94Tom</div><div><br class=3D""></div><div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; font-family: =
Helvetica; font-size: 16px; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; line-height: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;"><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D""><o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ron<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">&nbsp;</span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;</span></div><div =
style=3D"border-style: none none none solid; border-left-color: blue; =
border-left-width: 1.5pt; padding: 0in 0in 0in 4pt;" class=3D""><div =
class=3D""><div style=3D"border-style: solid none none; =
border-top-color: rgb(225, 225, 225); border-top-width: 1pt; padding: =
3pt 0in 0in;" class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><b =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">From:</span></b><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>Thomas D. Nadeau [<a =
href=3D"mailto:tnadeau@lucidvision.com" style=3D"color: purple; =
text-decoration: underline;" =
class=3D"">mailto:tnadeau@lucidvision.com</a>]<span =
class=3D"Apple-converted-space">&nbsp;</span><br class=3D""><b =
class=3D"">Sent:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Thursday, November 20, 2014 =
9:43 AM<br class=3D""><b class=3D"">To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Sam Aldrin<br class=3D""><b =
class=3D"">Cc:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Ronald Bonica;<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:mpls@ietf.org" style=3D"color: purple; text-decoration: =
underline;" class=3D"">mpls@ietf.org</a><br class=3D""><b =
class=3D"">Subject:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Re: [mpls] =
draft-bonica-mpls-self-ping: Response to comments from the mike<o:p =
class=3D""></o:p></span></div></div></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span =
class=3D"apple-tab-span">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;<span class=3D"Apple-converted-space">&nbsp;</span></span><o:p =
class=3D""></o:p></div><div class=3D""><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span =
class=3D"apple-tab-span">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;<span class=3D"Apple-converted-space">&nbsp;</span></span>To me =
what is described in the draft seems like this is a description of a =
device/vendor feature that automates the basic procedures of 4379/etc.. =
This can and has been done for quite some time using other means such as =
onboard automated scripts/actions after paths are established/signaled. =
I say this not to be glib, but because I built such a thing about 10 =
years ago that has been deployed widely. &nbsp;Also, as Sam says, there =
is some deviation from RFC4379 which we should ask is worth the =
additional complication (and required implementation + associated =
delay/etc...) versus just using the existing means.&nbsp;<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span =
class=3D"apple-tab-span">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;<span class=3D"Apple-converted-space">&nbsp;</span></span>The =
bottom line is that we should be asking ourselves whether or not this =
something we really need to standardize.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span =
class=3D"apple-tab-span">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;<span class=3D"Apple-converted-space">&nbsp;</span></span>=E2=80=94To=
m<o:p class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div><div =
class=3D""><blockquote style=3D"margin-top: 5pt; margin-bottom: 5pt;" =
class=3D""><div class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D"">On =
Nov 19, 2014:10:28 PM, at 10:28 PM, Sam Aldrin &lt;<a =
href=3D"mailto:aldrin.ietf@gmail.com" style=3D"color: purple; =
text-decoration: underline;" class=3D"">aldrin.ietf@gmail.com</a>&gt; =
wrote:<o:p class=3D""></o:p></div></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D"">Hi Ron,<o:p =
class=3D""></o:p></div><div class=3D""><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Still trying to understand the need for =
the draft, hence, have few of questions and need clarifications. =
Appreciate your response in advance.<o:p class=3D""></o:p></div></div><div=
 class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">1. (clarification q) The Ingress LSR sends the Echo =
request, with destination IP address to self, and forwards to Egress LSR =
(sec 2), correct? &nbsp;Is this the only thing which identifies the =
Ingress LSR or something else too?<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D"">2. What happens if =
there is LSP breakage or something and the Echo request ends up on =
transit LSR? Doesn't it process? I see that draft says, this will avoid =
control plane processing. How so? The packet is forwarded from ingress =
to egress, which means, the egress will have to process the packet i.e. =
look up the ip address to send it back to ingress.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Draft says "<span style=3D"font-size: =
10pt;" class=3D"">The egress LSR forwards the MPLS Echo message to its =
destination, the</span><o:p class=3D""></o:p></div></div><pre =
style=3D"margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: =
'Courier New'; line-height: 14.4pt;" class=3D"">&nbsp;&nbsp; ingress =
LSR.&nbsp; The egress LSR forwards the MPLS Echo message exactly<o:p =
class=3D""></o:p></pre><pre style=3D"margin: 0in 0in 0.0001pt; =
font-size: 10pt; font-family: 'Courier New'; line-height: 14.4pt;" =
class=3D"">&nbsp;&nbsp; as it would forward any other packet."<o:p =
class=3D""></o:p></pre><pre style=3D"margin: 0in 0in 0.0001pt; =
font-size: 10pt; font-family: 'Courier New'; line-height: 14.4pt;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></pre><pre style=3D"margin: 0in =
0in 0.0001pt; font-size: 10pt; font-family: 'Courier New'; line-height: =
14.4pt;" class=3D"">Could you explain, how egress forwards the packet =
back to ingress w/o looking up the packet IP header i.e. in the data =
plane and no additional control plane of OAM process?<o:p =
class=3D""></o:p></pre><div class=3D""><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">3. Is the assertion that, if Echo Reply is received back at =
the ingress then it is failure, rather it should receive Echo Request =
back at Ingress, correct?<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D"">4. Why can't you use =
LSP proxy ping to self via Egress?<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">Will followup with additional questions, if any, =
based on your responses.<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">cheers<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D"">-sam<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div class=3D""><blockquote =
style=3D"margin-top: 5pt; margin-bottom: 5pt;" class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D"">On Nov 19, 2014, at =
8:38 AM, Ronald Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" =
style=3D"color: purple; text-decoration: underline;" =
class=3D"">rbonica@juniper.net</a>&gt; wrote:<o:p =
class=3D""></o:p></div></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">Folks<br class=3D""><br class=3D"">At IETF 91, the following =
points were raised with regard to draft-bonica-mpls-self-ping:<br =
class=3D""><br class=3D"">1) Why not use BFD?<br class=3D"">2) Self-ping =
does not diagnose FIB programming errors in which an LSR other than the =
egress de-encapsulates and forwards the packet.<br class=3D"">3) How =
does Self ping verify a bidirectional LSP's readiness to carry traffic =
in both directions?<br class=3D"">4) Why does MPLS Self ping use MPLS =
Echo packets, as opposed to ICMP echo packets or some other packet =
format?<br class=3D""><br class=3D"">Responses follow:<br class=3D""><br =
class=3D"">1) Why not use BFD?<br class=3D""><br class=3D"">Self Ping is =
an extremely light-weight protocol. A typical Self Ping session emits =
one or two packets and terminates less than one second after initiation. =
Self-ping requires no configuration or control plane resources on the =
egress LSR.<span class=3D"Apple-converted-space">&nbsp;</span><br =
class=3D""><br class=3D"">By contrast, BFD is designed to verify =
bi-directional connectivity over a longer period of time. Therefore, =
MPLS Self Ping is appropriate in environments where BFD is too resource =
intensive.<br class=3D""><br class=3D"">2) Self-ping does not diagnose =
programming errors in which an LSR other than the egress de-encapsulates =
and forwards the packet.<br class=3D""><br class=3D"">Self Ping is =
designed to verify LSP readiness without consuming control plane =
resources on the egress router. It is not designed to diagnose =
programming errors in which an LSR other than the egress de-encapsulates =
and forwards the packet. Mechanisms that diagnose such issues are =
available [RFC 4950]. However, they are more resource intensive.<br =
class=3D""><br class=3D"">3) How does Self ping verify a bidirectional =
LSP's readiness to carry traffic in both directions?<br class=3D""><br =
class=3D"">In order to verify bidirectional LSP readiness, RSVP =
instantiates two LSP Self Ping sessions, one at each end of the LSP. The =
LSR at one end of the LSP initiates a self ping session when it receives =
a RESV message. The LSR at the other end of the LSP initiates a Self =
Ping Session when it sends a RESV message. Each LSP endpoint forwards =
traffic over the LSP only after the LSP Self Ping session terminates =
successfully<br class=3D""><br class=3D"">4) Why does LSP Self Ping use =
MPLS Echo packets, as opposed to some other packet format?<br =
class=3D""><br class=3D"">LSP Self Ping could have used many packet =
formats. The only hard requirement was to have one 64-bit field in which =
the 64 bit session identifier could be encoded. The MPLS Echo packet was =
convenient because its Senders Handle is 64-bits long.<span =
class=3D"Apple-converted-space">&nbsp;</span><br class=3D""><br =
class=3D"">I will update the draft to reflect this information.<br =
class=3D""><br class=3D"">Ron Bonica<br class=3D""><br =
class=3D"">_______________________________________________<br =
class=3D"">mpls mailing list<br class=3D""><a =
href=3D"mailto:mpls@ietf.org" style=3D"color: purple; text-decoration: =
underline;" class=3D"">mpls@ietf.org</a><br class=3D""><a =
href=3D"https://www.ietf.org/mailman/listinfo/mpls" style=3D"color: =
purple; text-decoration: underline;" =
class=3D"">https://www.ietf.org/mailman/listinfo/mpls</a><o:p =
class=3D""></o:p></div></div></blockquote></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" =
class=3D"">_______________________________________________<br =
class=3D"">mpls mailing list<br class=3D""><a =
href=3D"mailto:mpls@ietf.org" style=3D"color: purple; text-decoration: =
underline;" class=3D"">mpls@ietf.org</a><br class=3D""><a =
href=3D"https://www.ietf.org/mailman/listinfo/mpls" style=3D"color: =
purple; text-decoration: underline;" =
class=3D"">https://www.ietf.org/mailman/listinfo/mpls</a></div></div></blo=
ckquote></div></div></div></div></div></blockquote></div><br =
class=3D""></body></html>=

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From: Ronald Bonica <rbonica@juniper.net>
To: "Shah, Himanshu" <hshah@ciena.com>, "Nobo Akiya (nobo)" <nobo@cisco.com>,  Sam Aldrin <aldrin.ietf@gmail.com>, Shahram Davari <davari@broadcom.com>
Thread-Topic: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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From nobody Sat Nov 22 07:16:31 2014
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Multiprotocol Label Switching Working Group of the IETF.

        Title           : Label Switched Path (LSP) and Pseudowire (PW) Ping/Trace over MPLS Network using Entropy Labels (EL)
        Authors         : Nobo Akiya
                          George Swallow
                          Carlos Pignataro
                          Andrew G. Malis
                          Sam Aldrin
	Filename        : draft-akiya-mpls-entropy-lsp-ping-04.txt
	Pages           : 21
	Date            : 2014-11-22

Abstract:
   The Multiprotocol Label Switching (MPLS) Label Switched Path (LSP)
   Ping and Traceroute are used to exercise specific paths of Equal-Cost
   Multipath (ECMP).  When LSP is signaled to use Entropy Label (EL)
   described in RFC6790, the ability for LSP Ping and Traceroute
   operation to discover and exercise ECMP paths has been lost in
   scenarios which LSRs apply deviating load balance techniques.  One
   such scenario is when some LSRs apply EL based load balancing while
   other LSRs apply non-EL based load balancing (ex: IP).  Another
   scenario is when EL based LSP is stitched with another LSP which can
   be EL based or non-EL based.

   This document extends the MPLS LSP Ping and Traceroute mechanisms to
   restore the ability of exercising specific paths of ECMP over LSP
   which make use of Entropy Label.  This document updates RFC4379,
   RFC6424 and RFC6790.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-akiya-mpls-entropy-lsp-ping/

There's also a htmlized version available at:
http://tools.ietf.org/html/draft-akiya-mpls-entropy-lsp-ping-04

A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=draft-akiya-mpls-entropy-lsp-ping-04


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From nobody Sat Nov 22 07:17:36 2014
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Multiprotocol Label Switching Working Group of the IETF.

        Title           : Label Switched Path (LSP) Ping/Trace Multipath Support for Link Aggregation Group (LAG) Interfaces
        Authors         : Nobo Akiya
                          George Swallow
                          Stephane Litkowski
                          Bruno Decraene
                          John E. Drake
	Filename        : draft-akiya-mpls-lsp-ping-lag-multipath-03.txt
	Pages           : 20
	Date            : 2014-11-22

Abstract:
   This document defines an extension to the Multiprotocol Label
   Switching (MPLS) Label Switched Path (LSP) Ping and Traceroute to
   describe Multipath Information for Link Aggregation (LAG) member
   links separately, thus allowing MPLS LSP Ping and Traceroute to
   discover and exercise specific paths of layer 2 (L2) Equal-Cost
   Multipath (ECMP) over LAG interfaces.

   This document updates RFC4379 and RFC6424.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-akiya-mpls-lsp-ping-lag-multipath/

There's also a htmlized version available at:
http://tools.ietf.org/html/draft-akiya-mpls-lsp-ping-lag-multipath-03

A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=draft-akiya-mpls-lsp-ping-lag-multipath-03


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

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From nobody Sat Nov 22 07:24:51 2014
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From: "Nobo Akiya (nobo)" <nobo@cisco.com>
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Subject: Re: [mpls] I-D Action: draft-akiya-mpls-lsp-ping-lag-multipath-03.txt
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Dear MPLS WG,

Authors of draft-akiya-mpls-lsp-ping-lag-multipath believe that draft-akiya=
-mpls-lsp-ping-lag-multipath-03 is ready to progress to become a WG documen=
t, and will be asking will be asking the chairs to take the document throug=
h the adoption process.=20

We are, always, looking for comments from experts to make the document into=
 better shape, and hoping for some.

Thanks!

-Nobo, on behalf of authors

> -----Original Message-----
> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of internet-
> drafts@ietf.org
> Sent: Saturday, November 22, 2014 10:17 AM
> To: i-d-announce@ietf.org
> Cc: mpls@ietf.org
> Subject: [mpls] I-D Action: draft-akiya-mpls-lsp-ping-lag-multipath-03.tx=
t
>=20
>=20
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
>  This draft is a work item of the Multiprotocol Label Switching Working
> Group of the IETF.
>=20
>         Title           : Label Switched Path (LSP) Ping/Trace Multipath =
Support for
> Link Aggregation Group (LAG) Interfaces
>         Authors         : Nobo Akiya
>                           George Swallow
>                           Stephane Litkowski
>                           Bruno Decraene
>                           John E. Drake
> 	Filename        : draft-akiya-mpls-lsp-ping-lag-multipath-03.txt
> 	Pages           : 20
> 	Date            : 2014-11-22
>=20
> Abstract:
>    This document defines an extension to the Multiprotocol Label
>    Switching (MPLS) Label Switched Path (LSP) Ping and Traceroute to
>    describe Multipath Information for Link Aggregation (LAG) member
>    links separately, thus allowing MPLS LSP Ping and Traceroute to
>    discover and exercise specific paths of layer 2 (L2) Equal-Cost
>    Multipath (ECMP) over LAG interfaces.
>=20
>    This document updates RFC4379 and RFC6424.
>=20
>=20
>=20
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-akiya-mpls-lsp-ping-lag-multipath/
>=20
> There's also a htmlized version available at:
> http://tools.ietf.org/html/draft-akiya-mpls-lsp-ping-lag-multipath-03
>=20
> A diff from the previous version is available at:
> http://www.ietf.org/rfcdiff?url2=3Ddraft-akiya-mpls-lsp-ping-lag-multipat=
h-
> 03
>=20
>=20
> Please note that it may take a couple of minutes from the time of
> submission until the htmlized version and diff are available at tools.iet=
f.org.
>=20
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls


From nobody Sat Nov 22 21:09:21 2014
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Subject: [mpls] poll to see if we have consensus to adopt draft-akiya-mpls-entropy-lsp-ping
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Working Group,

This is to start a two week poll on adopting
draft-akiya-mpls-entropy-lsp-ping-04 as an MPLS working group document.

A bit if background, we had this document almost ready to go to the
working group adoption poll, but a discussion between authors and chairs
converged on that it would be beneficial to have to new IANA registries
set up. Since those registries would include code points defined in
other documents we could not define the registries in the current
document. We now have draft-ietf-mpls-lsp-ping-registry adopted as a
working group document, and can now progress draft-akiya-mpls-entropy-
lsp-ping.

Please send your comments (support/not support) to the mpls working
group mailing list (mpls@ietf.org). Please give a technical
motivation for your support/not support, especially if you think that
the document should not be adopted as a working group document.

There is two IPR disclosures directly against this document.

The authors has all stated on the working group mailing
list that they are unaware of any other IPR claims against this draft
than the two disclosed.

However if you are on the the mpls working group mailing list and
aware of IPR that relates to this draft, the time to disclose
this is now.

This poll ends December 8, 2014.

/Loa
-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


From nobody Sat Nov 22 23:07:49 2014
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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'Barry Leiba'" <barryleiba@computer.org>
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In-Reply-To: <20141123064914.2745.26911.idtracker@ietfa.amsl.com>
Date: Sun, 23 Nov 2014 07:07:37 -0000
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Subject: Re: [mpls] Barry Leiba's Discuss on draft-ietf-mpls-ipv6-only-gap-03: (with DISCUSS and COMMENT)
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[Adding the MPLS WG]

That's a pretty fine question, Barry.

I'd say that, despite the care and work of the working group, it is =
possible that another gap will be identified. However, I think that =
might be a lowish possibility and that any new gaps might form a small =
percentage of the total gaps analysed.

So, my judgement is that this is a bridge to cross when we get there, =
but others might comment.

And, yes, we can take a pass on the references.

A

> -----Original Message-----
> From: iesg [mailto:iesg-bounces@ietf.org] On Behalf Of Barry Leiba
> Sent: 23 November 2014 06:49
> To: The IESG
> Cc: mpls-chairs@tools.ietf.org; =
draft-ietf-mpls-ipv6-only-gap@tools.ietf.org
> Subject: Barry Leiba's Discuss on draft-ietf-mpls-ipv6-only-gap-03: =
(with DISCUSS
> and COMMENT)
>=20
> Barry Leiba has entered the following ballot position for
> draft-ietf-mpls-ipv6-only-gap-03: Discuss
>=20
> When responding, please keep the subject line intact and reply to all
> email addresses included in the To and CC lines. (Feel free to cut =
this
> introductory paragraph, however.)
>=20
>=20
> Please refer to =
http://www.ietf.org/iesg/statement/discuss-criteria.html
> for more information about IESG DISCUSS and COMMENT positions.
>=20
>=20
> The document, along with other ballot positions, can be found here:
> http://datatracker.ietf.org/doc/draft-ietf-mpls-ipv6-only-gap/
>=20
>=20
>=20
> ----------------------------------------------------------------------
> DISCUSS:
> ----------------------------------------------------------------------
>=20
> This is a DISCUSS in the truest sense: I'd like to discuss a question
> with the shepherd and/or AD, and I fully expect to resolve the =
question
> satisfactorily from that.
>=20
> The first thing I wondered was why this shouldn't be something =
maintained
> in a place other than an RFC, and I found that covered well in the
> shepherd writeup. Thanks for that!
>=20
> What I continue to wonder is whether, in having that discussion, the
> working group considered what the likelihood is of discovering more =
gaps
> as they (and other working groups) work on dealing with these.  If so, =
I
> wonder what the working group's plan is for documenting those.
>=20
>=20
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
>=20
> I submit that a good number of the references really are normative, in
> that understanding them is necessary in order to understand this
> document.  I'd like to see the authors sort that out, and make an
> appropriate split in the references, so readers can know which ones =
truly
> do just add extra detail (informative), and which provide necessary
> background (normative).  That said, I don't consider that important
> enough to this document to block on it, so this is a non-blocking
> comment.  Please consider doing this, but there is no need to respond =
to
> me about it.  Thanks.



From nobody Sun Nov 23 00:47:56 2014
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From: <stephane.litkowski@orange.com>
To: Uma Chunduri <uma.chunduri@ericsson.com>, Alia Atlas <akatlas@gmail.com>,  Loa Andersson <loa@pi.nu>
Thread-Topic: maturity of the MRT technology
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From nobody Sun Nov 23 01:57:30 2014
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From: "Stewart Bryant (stbryant)" <stbryant@cisco.com>
To: "<adrian@olddog.co.uk>" <adrian@olddog.co.uk>
Thread-Topic: [mpls] Barry Leiba's Discuss on draft-ietf-mpls-ipv6-only-gap-03: (with DISCUSS and COMMENT)
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Date: Sun, 23 Nov 2014 09:57:22 +0000
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Subject: Re: [mpls] Barry Leiba's Discuss on draft-ietf-mpls-ipv6-only-gap-03: (with DISCUSS and COMMENT)
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Does that meet the discuss criteria?

Stewart

Sent from my iPad

> On 23 Nov 2014, at 07:08, Adrian Farrel <adrian@olddog.co.uk> wrote:
>=20
> [Adding the MPLS WG]
>=20
> That's a pretty fine question, Barry.
>=20
> I'd say that, despite the care and work of the working group, it is possi=
ble that another gap will be identified. However, I think that might be a l=
owish possibility and that any new gaps might form a small percentage of th=
e total gaps analysed.
>=20
> So, my judgement is that this is a bridge to cross when we get there, but=
 others might comment.
>=20
> And, yes, we can take a pass on the references.
>=20
> A
>=20
>> -----Original Message-----
>> From: iesg [mailto:iesg-bounces@ietf.org] On Behalf Of Barry Leiba
>> Sent: 23 November 2014 06:49
>> To: The IESG
>> Cc: mpls-chairs@tools.ietf.org; draft-ietf-mpls-ipv6-only-gap@tools.ietf=
.org
>> Subject: Barry Leiba's Discuss on draft-ietf-mpls-ipv6-only-gap-03: (wit=
h DISCUSS
>> and COMMENT)
>>=20
>> Barry Leiba has entered the following ballot position for
>> draft-ietf-mpls-ipv6-only-gap-03: Discuss
>>=20
>> When responding, please keep the subject line intact and reply to all
>> email addresses included in the To and CC lines. (Feel free to cut this
>> introductory paragraph, however.)
>>=20
>>=20
>> Please refer to http://www.ietf.org/iesg/statement/discuss-criteria.html
>> for more information about IESG DISCUSS and COMMENT positions.
>>=20
>>=20
>> The document, along with other ballot positions, can be found here:
>> http://datatracker.ietf.org/doc/draft-ietf-mpls-ipv6-only-gap/
>>=20
>>=20
>>=20
>> ----------------------------------------------------------------------
>> DISCUSS:
>> ----------------------------------------------------------------------
>>=20
>> This is a DISCUSS in the truest sense: I'd like to discuss a question
>> with the shepherd and/or AD, and I fully expect to resolve the question
>> satisfactorily from that.
>>=20
>> The first thing I wondered was why this shouldn't be something maintaine=
d
>> in a place other than an RFC, and I found that covered well in the
>> shepherd writeup. Thanks for that!
>>=20
>> What I continue to wonder is whether, in having that discussion, the
>> working group considered what the likelihood is of discovering more gaps
>> as they (and other working groups) work on dealing with these.  If so, I
>> wonder what the working group's plan is for documenting those.
>>=20
>>=20
>> ----------------------------------------------------------------------
>> COMMENT:
>> ----------------------------------------------------------------------
>>=20
>> I submit that a good number of the references really are normative, in
>> that understanding them is necessary in order to understand this
>> document.  I'd like to see the authors sort that out, and make an
>> appropriate split in the references, so readers can know which ones trul=
y
>> do just add extra detail (informative), and which provide necessary
>> background (normative).  That said, I don't consider that important
>> enough to this document to block on it, so this is a non-blocking
>> comment.  Please consider doing this, but there is no need to respond to
>> me about it.  Thanks.
>=20
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls


From nobody Sun Nov 23 06:33:05 2014
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Date: Sun, 23 Nov 2014 22:32:45 +0800
From: Loa Andersson <loa@pi.nu>
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To: adrian@olddog.co.uk, 'Barry Leiba' <barryleiba@computer.org>
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Subject: Re: [mpls] Barry Leiba's Discuss on draft-ietf-mpls-ipv6-only-gap-03: (with DISCUSS and COMMENT)
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Barry,

I don't know how much more I have to after Adrian's mail, it seems
cover the issues.

We never had the ambition to find every gap, but believed that
that documenting for the future that we made the effort and also that
the gaps we found would be a good enough idea.

I differ from Adrian on one point, I think it is very likely that we'll
find new gaps, however they will be few and with low impact.

This begs the question how we'll maintain the management of the gaps
and the recommendations around for each gap should be done. An idea
that has been circualted it to use a wiki page, but so far there is no
decision. But - as our ADs have said - with a wiki we don't really need
a decision, just someone that takes on the task to do it.

As for the references I agree that it is possible to take a pass on
them, the thing with how (other than normative informative) one prefer
to have references sort are very personal.

/Loa


On 2014-11-23 15:07, Adrian Farrel wrote:
> [Adding the MPLS WG]
>
> That's a pretty fine question, Barry.
>
> I'd say that, despite the care and work of the working group, it is possible that another gap will be identified. However, I think that might be a lowish possibility and that any new gaps might form a small percentage of the total gaps analysed.
>
> So, my judgement is that this is a bridge to cross when we get there, but others might comment.
>
> And, yes, we can take a pass on the references.
>
> A
>
>> -----Original Message-----
>> From: iesg [mailto:iesg-bounces@ietf.org] On Behalf Of Barry Leiba
>> Sent: 23 November 2014 06:49
>> To: The IESG
>> Cc: mpls-chairs@tools.ietf.org; draft-ietf-mpls-ipv6-only-gap@tools.ietf.org
>> Subject: Barry Leiba's Discuss on draft-ietf-mpls-ipv6-only-gap-03: (with DISCUSS
>> and COMMENT)
>>
>> Barry Leiba has entered the following ballot position for
>> draft-ietf-mpls-ipv6-only-gap-03: Discuss
>>
>> When responding, please keep the subject line intact and reply to all
>> email addresses included in the To and CC lines. (Feel free to cut this
>> introductory paragraph, however.)
>>
>>
>> Please refer to http://www.ietf.org/iesg/statement/discuss-criteria.html
>> for more information about IESG DISCUSS and COMMENT positions.
>>
>>
>> The document, along with other ballot positions, can be found here:
>> http://datatracker.ietf.org/doc/draft-ietf-mpls-ipv6-only-gap/
>>
>>
>>
>> ----------------------------------------------------------------------
>> DISCUSS:
>> ----------------------------------------------------------------------
>>
>> This is a DISCUSS in the truest sense: I'd like to discuss a question
>> with the shepherd and/or AD, and I fully expect to resolve the question
>> satisfactorily from that.
>>
>> The first thing I wondered was why this shouldn't be something maintained
>> in a place other than an RFC, and I found that covered well in the
>> shepherd writeup. Thanks for that!
>>
>> What I continue to wonder is whether, in having that discussion, the
>> working group considered what the likelihood is of discovering more gaps
>> as they (and other working groups) work on dealing with these.  If so, I
>> wonder what the working group's plan is for documenting those.
>>
>>
>> ----------------------------------------------------------------------
>> COMMENT:
>> ----------------------------------------------------------------------
>>
>> I submit that a good number of the references really are normative, in
>> that understanding them is necessary in order to understand this
>> document.  I'd like to see the authors sort that out, and make an
>> appropriate split in the references, so readers can know which ones truly
>> do just add extra detail (informative), and which provide necessary
>> background (normative).  That said, I don't consider that important
>> enough to this document to block on it, so this is a non-blocking
>> comment.  Please consider doing this, but there is no need to respond to
>> me about it.  Thanks.
>
>

-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


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Subject: Re: [mpls] Barry Leiba's Discuss on draft-ietf-mpls-ipv6-only-gap-03: (with DISCUSS and COMMENT)
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On Sunday, November 23, 2014 04:32:45 PM Loa Andersson=20
wrote:

> This begs the question how we'll maintain the management
> of the gaps and the recommendations around for each gap
> should be done. An idea that has been circualted it to
> use a wiki page, but so far there is no decision. But -
> as our ADs have said - with a wiki we don't really need
> a decision, just someone that takes on the task to do
> it.

I would support a wiki, as that can be edited by the group=20
at anytime, and anything in the wiki that makes sense to add=20
into an IETF draft or RFC can help ensure the drafts/RFC's=20
have the most pertinent information, and don't end up=20
getting unnecessarily bloated.

Mark.

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Subject: [mpls] Repeated WG last call on draft-ietf-mpls-in-udp
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Working Group,

This is to start a two week Working Group last call on  draft-ietf-mpls-in-=
udp-07.txt.

Please send your comments to the mpls working group mailing list (mpls@ietf=
.org<mailto:mpls@ietf.org>).

Please send both technical comments, and (if you are happy with the documen=
t as is)
also send indications of support.

You will recall that this document passed WG last call more than a year ago=
. However, the
subsequent IETF last call (in January 2014) resulted in a lengthy discussio=
n, particularly over
issues related to congestion and to the use (or non-use) of the UDP checksu=
m with IPv6.
After discussions in the March and July meetings this year (in London and T=
oronto,
respectively), a design team was formed to come up with improved text relat=
ed to
congestion control and checksum use. The document has been updated signific=
antly and
the changes were presented at the recent IETF meeting in Honolulu, in both =
MPLS and
TSVWG WGs.

There is one IPR claim that applies to this draft, which can be seen at:
https://datatracker.ietf.org/ipr/1941/

The coauthors and contributor have indicated that they don't know of any ot=
her
IPR applicable to this draft. If anyone else in the working group is aware =
of IPR
claims against this draft, the time to disclose that is now.

This working group last call will end on December 8, 2014.

Ross
for the wg co-chairs

PS: Please also note that if you look at an earlier version of the document=
 on the IETF
tools web site, due to some sort of glitch in the tools server there is not=
 a place to click
under "version" at the top of the page to get version 7. However, the corre=
ct version is
available at both https://tools.ietf.org/html/draft-ietf-mpls-in-udp-07 and=
 also on the
datatracker at https://datatracker.ietf.org/doc/draft-ietf-mpls-in-udp/.



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<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">Working Group,<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">This is to start a two week Working Gro=
up last call on&nbsp; draft-ietf-mpls-in-udp-07.txt.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">Please send your comments to the mpls w=
orking group mailing list (<a href=3D"mailto:mpls@ietf.org"><span style=3D"=
color:windowtext">mpls@ietf.org</span></a>).<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">Please send both technical comments, an=
d (if you are happy with the document as is)
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">also send indications of support.<o:p><=
/o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">You will recall that this document pass=
ed WG last call more than a year ago. However, the
<span style=3D"color:#1F497D"><o:p></o:p></span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">subsequent IETF last call (in January 2=
014) resulted in a lengthy discussion, particularly over
<span style=3D"color:#1F497D"><o:p></o:p></span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">issues related to congestion and to the=
 use (or non-use) of the UDP checksum with IPv6.
<span style=3D"color:#1F497D"><o:p></o:p></span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">After discussions in the March and July=
 meetings this year (in London and Toronto,
<span style=3D"color:#1F497D"><o:p></o:p></span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">respectively), a design team was formed=
 to come up with improved text related to
<span style=3D"color:#1F497D"><o:p></o:p></span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">congestion control and checksum use. Th=
e document has been updated significantly and
<span style=3D"color:#1F497D"><o:p></o:p></span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">the changes were presented at the recen=
t IETF meeting in Honolulu, in both MPLS and
<span style=3D"color:#1F497D"><o:p></o:p></span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">TSVWG WGs.
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">There is one IPR claim that applies to =
this draft, which can be seen at:<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;"><a href=3D"https://datatracker.ietf.org=
/ipr/1941/"><span style=3D"color:windowtext">https://datatracker.ietf.org/i=
pr/1941/</span></a>
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">The coauthors and contributor have indi=
cated that they don&#8217;t know of any other
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">IPR applicable to this draft. If anyone=
 else in the working group is aware of IPR
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">claims against this draft, the time to =
disclose that is now.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">This working group last call will end o=
n December 8, 2014.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">Ross<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">for the wg co-chairs<o:p></o:p></span><=
/p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">PS: Please also note that if you look a=
t an earlier version of the document on the IETF
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">tools web site, due to some sort of gli=
tch in the tools server there is not a place to click
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">under &#8220;version&#8221; at the top =
of the page to get version 7. However, the correct version is
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">available at both
<a href=3D"https://tools.ietf.org/html/draft-ietf-mpls-in-udp-07"><span sty=
le=3D"color:windowtext">https://tools.ietf.org/html/draft-ietf-mpls-in-udp-=
07</span></a> and also on the
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">datatracker at
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-mpls-in-udp/"><span =
style=3D"color:windowtext">https://datatracker.ietf.org/doc/draft-ietf-mpls=
-in-udp/</span></a>.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
</div>
</div>
</body>
</html>

--_000_92cfc78ef38f4e9aa6d8345353afe746BY1PR0501MB1430namprd05_--


From nobody Sun Nov 23 23:15:09 2014
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From: Vero Zheng <vero.zheng@huawei.com>
To: Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] poll to see if we have consensus to adopt draft-akiya-mpls-entropy-lsp-ping
Thread-Index: AQHQBtuvJJv650t4CUqdlSphTTN47JxvXk4Q
Date: Mon, 24 Nov 2014 07:14:38 +0000
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References: <54716BEC.9050700@pi.nu>
In-Reply-To: <54716BEC.9050700@pi.nu>
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Subject: Re: [mpls] poll to see if we have consensus to adopt draft-akiya-mpls-entropy-lsp-ping
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I read this document and I think it solves the real problem which may happe=
n in the deployment.
I support the adoption of it as WG document.

Cheers, Vero

> -----Original Message-----
> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson
> Sent: Sunday, November 23, 2014 1:09 PM
> To: mpls@ietf.org
> Cc: mpls-chairs@tools.ietf.org;
> draft-akiya-mpls-entropy-lsp-ping@tools.ietf.org
> Subject: [mpls] poll to see if we have consensus to adopt
> draft-akiya-mpls-entropy-lsp-ping
>=20
> Working Group,
>=20
> This is to start a two week poll on adopting
> draft-akiya-mpls-entropy-lsp-ping-04 as an MPLS working group document.
>=20
> A bit if background, we had this document almost ready to go to the worki=
ng
> group adoption poll, but a discussion between authors and chairs converge=
d on
> that it would be beneficial to have to new IANA registries set up. Since =
those
> registries would include code points defined in other documents we could =
not
> define the registries in the current document. We now have
> draft-ietf-mpls-lsp-ping-registry adopted as a working group document, an=
d can
> now progress draft-akiya-mpls-entropy- lsp-ping.
>=20
> Please send your comments (support/not support) to the mpls working group
> mailing list (mpls@ietf.org). Please give a technical motivation for your
> support/not support, especially if you think that the document should not=
 be
> adopted as a working group document.
>=20
> There is two IPR disclosures directly against this document.
>=20
> The authors has all stated on the working group mailing list that they ar=
e
> unaware of any other IPR claims against this draft than the two disclosed=
.
>=20
> However if you are on the the mpls working group mailing list and aware o=
f IPR
> that relates to this draft, the time to disclose this is now.
>=20
> This poll ends December 8, 2014.
>=20
> /Loa
> --
>=20
>=20
> Loa Andersson                        email: loa@mail01.huawei.com
> Senior MPLS Expert                          loa@pi.nu
> Huawei Technologies (consultant)     phone: +46 739 81 21 64
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls


From nobody Sun Nov 23 23:32:32 2014
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From: Jeff Tantsura <jeff.tantsura@ericsson.com>
To: Loa Andersson <loa@pi.nu>
Thread-Topic: [mpls] poll to see if we have consensus to adopt draft-akiya-mpls-entropy-lsp-ping
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Subject: Re: [mpls] poll to see if we have consensus to adopt draft-akiya-mpls-entropy-lsp-ping
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Yes/support

Regards,
Jeff

> On Nov 22, 2014, at 9:09 PM, "Loa Andersson" <loa@pi.nu> wrote:
>=20
> Working Group,
>=20
> This is to start a two week poll on adopting
> draft-akiya-mpls-entropy-lsp-ping-04 as an MPLS working group document.
>=20
> A bit if background, we had this document almost ready to go to the
> working group adoption poll, but a discussion between authors and chairs
> converged on that it would be beneficial to have to new IANA registries
> set up. Since those registries would include code points defined in
> other documents we could not define the registries in the current
> document. We now have draft-ietf-mpls-lsp-ping-registry adopted as a
> working group document, and can now progress draft-akiya-mpls-entropy-
> lsp-ping.
>=20
> Please send your comments (support/not support) to the mpls working
> group mailing list (mpls@ietf.org). Please give a technical
> motivation for your support/not support, especially if you think that
> the document should not be adopted as a working group document.
>=20
> There is two IPR disclosures directly against this document.
>=20
> The authors has all stated on the working group mailing
> list that they are unaware of any other IPR claims against this draft
> than the two disclosed.
>=20
> However if you are on the the mpls working group mailing list and
> aware of IPR that relates to this draft, the time to disclose
> this is now.
>=20
> This poll ends December 8, 2014.
>=20
> /Loa
> --=20
>=20
>=20
> Loa Andersson                        email: loa@mail01.huawei.com
> Senior MPLS Expert                          loa@pi.nu
> Huawei Technologies (consultant)     phone: +46 739 81 21 64
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls


From nobody Mon Nov 24 06:06:16 2014
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From: Barry Leiba <barryleiba@computer.org>
To: "Stewart Bryant (stbryant)" <stbryant@cisco.com>
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Subject: Re: [mpls] Barry Leiba's Discuss on draft-ietf-mpls-ipv6-only-gap-03: (with DISCUSS and COMMENT)
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> Does that meet the discuss criteria?

"Did the working group consider <x>?" absolutely does, yes.  And I
find it disturbing that you would rather ask that question than
address the question I'm asking.

Barry

>> On 23 Nov 2014, at 07:08, Adrian Farrel <adrian@olddog.co.uk> wrote:
>>
>> [Adding the MPLS WG]
>>
>> That's a pretty fine question, Barry.
>>
>> I'd say that, despite the care and work of the working group, it is possible that another gap will be identified. However, I think that might be a lowish possibility and that any new gaps might form a small percentage of the total gaps analysed.
>>
>> So, my judgement is that this is a bridge to cross when we get there, but others might comment.
>>
>> And, yes, we can take a pass on the references.
>>
>> A
>>
>>> -----Original Message-----
>>> From: iesg [mailto:iesg-bounces@ietf.org] On Behalf Of Barry Leiba
>>> Sent: 23 November 2014 06:49
>>> To: The IESG
>>> Cc: mpls-chairs@tools.ietf.org; draft-ietf-mpls-ipv6-only-gap@tools.ietf.org
>>> Subject: Barry Leiba's Discuss on draft-ietf-mpls-ipv6-only-gap-03: (with DISCUSS
>>> and COMMENT)
>>>
>>> Barry Leiba has entered the following ballot position for
>>> draft-ietf-mpls-ipv6-only-gap-03: Discuss
>>>
>>> When responding, please keep the subject line intact and reply to all
>>> email addresses included in the To and CC lines. (Feel free to cut this
>>> introductory paragraph, however.)
>>>
>>>
>>> Please refer to http://www.ietf.org/iesg/statement/discuss-criteria.html
>>> for more information about IESG DISCUSS and COMMENT positions.
>>>
>>>
>>> The document, along with other ballot positions, can be found here:
>>> http://datatracker.ietf.org/doc/draft-ietf-mpls-ipv6-only-gap/
>>>
>>>
>>>
>>> ----------------------------------------------------------------------
>>> DISCUSS:
>>> ----------------------------------------------------------------------
>>>
>>> This is a DISCUSS in the truest sense: I'd like to discuss a question
>>> with the shepherd and/or AD, and I fully expect to resolve the question
>>> satisfactorily from that.
>>>
>>> The first thing I wondered was why this shouldn't be something maintained
>>> in a place other than an RFC, and I found that covered well in the
>>> shepherd writeup. Thanks for that!
>>>
>>> What I continue to wonder is whether, in having that discussion, the
>>> working group considered what the likelihood is of discovering more gaps
>>> as they (and other working groups) work on dealing with these.  If so, I
>>> wonder what the working group's plan is for documenting those.
>>>
>>>
>>> ----------------------------------------------------------------------
>>> COMMENT:
>>> ----------------------------------------------------------------------
>>>
>>> I submit that a good number of the references really are normative, in
>>> that understanding them is necessary in order to understand this
>>> document.  I'd like to see the authors sort that out, and make an
>>> appropriate split in the references, so readers can know which ones truly
>>> do just add extra detail (informative), and which provide necessary
>>> background (normative).  That said, I don't consider that important
>>> enough to this document to block on it, so this is a non-blocking
>>> comment.  Please consider doing this, but there is no need to respond to
>>> me about it.  Thanks.
>>
>>
>> _______________________________________________
>> mpls mailing list
>> mpls@ietf.org
>> https://www.ietf.org/mailman/listinfo/mpls
>


From nobody Mon Nov 24 06:12:27 2014
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Subject: Re: [mpls] Barry Leiba's Discuss on draft-ietf-mpls-ipv6-only-gap-03: (with DISCUSS and COMMENT)
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Thanks, Adrian, Loa, and Mark, for the responses.

> I don't know how much more I have to after Adrian's mail, it seems
> cover the issues.

It does.  And, yet, your message does add a useful comment:

> We never had the ambition to find every gap, but believed that
> that documenting for the future that we made the effort and also that
> the gaps we found would be a good enough idea.
>
> I differ from Adrian on one point, I think it is very likely that we'll
> find new gaps, however they will be few and with low impact.

That's a good answer, and thanks for adding that.  Mark's comment is
also helpful:

> I would support a wiki, as that can be edited by the group
> at anytime, and anything in the wiki that makes sense to add
> into an IETF draft or RFC can help ensure the drafts/RFC's
> have the most pertinent information, and don't end up
> getting unnecessarily bloated.

That's a perfect use of the working group wiki, and that should take
care of the question entirely.

Off to change my ballot now...

> As for the references I agree that it is possible to take a pass on
> them

OK.  I'm sad about that, but not terribly so: as I said, I think it
would be helpful, but not so important for this document.  So carry
on, and thanks again for the good responses.

Barry


From nobody Mon Nov 24 06:56:48 2014
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Subject: [mpls] IETF91 - MPLS sessions - Minutes
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All,

the minutes of the MPLS sessions are available:
http://www.ietf.org/proceedings/91/minutes/minutes-91-mpls

Please read them and let me know if I have missed something.

Thanks
-m


From nobody Mon Nov 24 07:07:24 2014
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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Mon, 24 Nov 2014 10:06:56 -0500
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To: Loa Andersson <loa@pi.nu>
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Cc: "mpls@ietf.org" <mpls@ietf.org>, "mpls-chairs@tools.ietf.org" <mpls-chairs@tools.ietf.org>, "draft-akiya-mpls-entropy-lsp-ping@tools.ietf.org" <draft-akiya-mpls-entropy-lsp-ping@tools.ietf.org>
Subject: Re: [mpls] poll to see if we have consensus to adopt draft-akiya-mpls-entropy-lsp-ping
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--001a113a7bd06e9a2205089c2666
Content-Type: text/plain; charset=UTF-8

Even though Loa doesn't like it, I'm STILL going to support adoption as a
co-author. :-) Loa is free to yell at me the next time he sees me. :-) :-)

Cheers,
Andy

On Mon, Nov 24, 2014 at 2:32 AM, Jeff Tantsura <jeff.tantsura@ericsson.com>
wrote:

> Yes/support
>
> Regards,
> Jeff
>
> > On Nov 22, 2014, at 9:09 PM, "Loa Andersson" <loa@pi.nu> wrote:
> >
> > Working Group,
> >
> > This is to start a two week poll on adopting
> > draft-akiya-mpls-entropy-lsp-ping-04 as an MPLS working group document.
> >
> > A bit if background, we had this document almost ready to go to the
> > working group adoption poll, but a discussion between authors and chairs
> > converged on that it would be beneficial to have to new IANA registries
> > set up. Since those registries would include code points defined in
> > other documents we could not define the registries in the current
> > document. We now have draft-ietf-mpls-lsp-ping-registry adopted as a
> > working group document, and can now progress draft-akiya-mpls-entropy-
> > lsp-ping.
> >
> > Please send your comments (support/not support) to the mpls working
> > group mailing list (mpls@ietf.org). Please give a technical
> > motivation for your support/not support, especially if you think that
> > the document should not be adopted as a working group document.
> >
> > There is two IPR disclosures directly against this document.
> >
> > The authors has all stated on the working group mailing
> > list that they are unaware of any other IPR claims against this draft
> > than the two disclosed.
> >
> > However if you are on the the mpls working group mailing list and
> > aware of IPR that relates to this draft, the time to disclose
> > this is now.
> >
> > This poll ends December 8, 2014.
> >
> > /Loa
> > --
> >
> >
> > Loa Andersson                        email: loa@mail01.huawei.com
> > Senior MPLS Expert                          loa@pi.nu
> > Huawei Technologies (consultant)     phone: +46 739 81 21 64
> >
> > _______________________________________________
> > mpls mailing list
> > mpls@ietf.org
> > https://www.ietf.org/mailman/listinfo/mpls
>

--001a113a7bd06e9a2205089c2666
Content-Type: text/html; charset=UTF-8
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<div dir=3D"ltr">Even though Loa doesn&#39;t like it, I&#39;m STILL going t=
o support adoption as a co-author. :-) Loa is free to yell at me the next t=
ime he sees me. :-) :-)<div><br></div><div>Cheers,</div><div>Andy</div></di=
v><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Mon, Nov 24,=
 2014 at 2:32 AM, Jeff Tantsura <span dir=3D"ltr">&lt;<a href=3D"mailto:jef=
f.tantsura@ericsson.com" target=3D"_blank">jeff.tantsura@ericsson.com</a>&g=
t;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0=
 .8ex;border-left:1px #ccc solid;padding-left:1ex">Yes/support<br>
<br>
Regards,<br>
Jeff<br>
<div class=3D"HOEnZb"><div class=3D"h5"><br>
&gt; On Nov 22, 2014, at 9:09 PM, &quot;Loa Andersson&quot; &lt;<a href=3D"=
mailto:loa@pi.nu">loa@pi.nu</a>&gt; wrote:<br>
&gt;<br>
&gt; Working Group,<br>
&gt;<br>
&gt; This is to start a two week poll on adopting<br>
&gt; draft-akiya-mpls-entropy-lsp-ping-04 as an MPLS working group document=
.<br>
&gt;<br>
&gt; A bit if background, we had this document almost ready to go to the<br=
>
&gt; working group adoption poll, but a discussion between authors and chai=
rs<br>
&gt; converged on that it would be beneficial to have to new IANA registrie=
s<br>
&gt; set up. Since those registries would include code points defined in<br=
>
&gt; other documents we could not define the registries in the current<br>
&gt; document. We now have draft-ietf-mpls-lsp-ping-registry adopted as a<b=
r>
&gt; working group document, and can now progress draft-akiya-mpls-entropy-=
<br>
&gt; lsp-ping.<br>
&gt;<br>
&gt; Please send your comments (support/not support) to the mpls working<br=
>
&gt; group mailing list (<a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>=
). Please give a technical<br>
&gt; motivation for your support/not support, especially if you think that<=
br>
&gt; the document should not be adopted as a working group document.<br>
&gt;<br>
&gt; There is two IPR disclosures directly against this document.<br>
&gt;<br>
&gt; The authors has all stated on the working group mailing<br>
&gt; list that they are unaware of any other IPR claims against this draft<=
br>
&gt; than the two disclosed.<br>
&gt;<br>
&gt; However if you are on the the mpls working group mailing list and<br>
&gt; aware of IPR that relates to this draft, the time to disclose<br>
&gt; this is now.<br>
&gt;<br>
&gt; This poll ends December 8, 2014.<br>
&gt;<br>
&gt; /Loa<br>
&gt; --<br>
&gt;<br>
&gt;<br>
&gt; Loa Andersson=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 email: <a href=3D"mailto:loa@mail01.huawei.com"=
>loa@mail01.huawei.com</a><br>
&gt; Senior MPLS Expert=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"mailto:loa@pi.nu">loa@pi.=
nu</a><br>
&gt; Huawei Technologies (consultant)=C2=A0 =C2=A0 =C2=A0phone: <a href=3D"=
tel:%2B46%20739%2081%2021%2064" value=3D"+46739812164">+46 739 81 21 64</a>=
<br>
&gt;<br>
</div></div><div class=3D"HOEnZb"><div class=3D"h5">&gt; __________________=
_____________________________<br>
&gt; mpls mailing list<br>
&gt; <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/mpls" target=3D"_blan=
k">https://www.ietf.org/mailman/listinfo/mpls</a><br>
</div></div></blockquote></div><br></div>

--001a113a7bd06e9a2205089c2666--


From nobody Mon Nov 24 07:58:07 2014
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Subject: [mpls] Last Call: <draft-ietf-mpls-tp-te-mib-09.txt> (MPLS-TP Traffic Engineering (TE) Management Information Base (MIB)) to Proposed Standard
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The IESG has received a request from the Multiprotocol Label Switching WG
(mpls) to consider the following document:
- 'MPLS-TP Traffic Engineering (TE) Management Information Base (MIB)'
  <draft-ietf-mpls-tp-te-mib-09.txt> as Proposed Standard

The IESG plans to make a decision in the next few weeks, and solicits
final comments on this action. Please send substantive comments to the
ietf@ietf.org mailing lists by 2014-12-08. Exceptionally, comments may be
sent to iesg@ietf.org instead. In either case, please retain the
beginning of the Subject line to allow automated sorting.

Abstract

   This memo defines a portion of the Management Information Base (MIB)
   for use with network management protocols in the Internet community.
   In particular, it describes additional managed objects of Tunnels,
   Identifiers, Label Switching Router and Textual conventions to
   support Multiprotocol Label Switching (MPLS) MIB modules for
   transport networks.

The file can be obtained via
http://datatracker.ietf.org/doc/draft-ietf-mpls-tp-te-mib/

IESG discussion can be tracked via
http://datatracker.ietf.org/doc/draft-ietf-mpls-tp-te-mib/ballot/


No IPR declarations have been submitted directly on this I-D.


From nobody Mon Nov 24 08:10:36 2014
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--_000_78118BE8EBB94F1F9414B30E0346A51Eciscocom_--


From nobody Mon Nov 24 08:29:41 2014
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From: "Pete Resnick" <presnick@qti.qualcomm.com>
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Subject: [mpls] Pete Resnick's Block on charter-ietf-mpls-06-04: (with BLOCK and COMMENT)
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Pete Resnick has entered the following ballot position for
charter-ietf-mpls-06-04: Block

When responding, please keep the subject line intact and reply to all
email addresses included in the To and CC lines. (Feel free to cut this
introductory paragraph, however.)



The document, along with other ballot positions, can be found here:
http://datatracker.ietf.org/doc/charter-ietf-mpls/



----------------------------------------------------------------------
BLOCK:
----------------------------------------------------------------------

   - Coordinate the work on RSVP-TE with CCAMP and TEAS, and 
     document where the work will be undertaken. In the cases where
     there is an overlap, generic parts will be done by the TEAS working
     group, MPLS data plane specific parts will be done by the MPLS
     working group, and support for any other specific data planes will
     be done by the CCAMP working group. The TEAS working group acts as
     the coordination point for this work.

The first sentence and the last sentence of this bullet seem to
contradict each other: Does this group do the coordination, or does TEAS?
But even so, I'm a bit concerned by a WG coordinating work and
documenting where it will be undertaken. Are you really saying that the
WG has to come to consensus on where a particular piece of protocol work
is to be done and then document that decision? That seems like an awfully
bizzarre item of work. Please clarify.


----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

   The working group's responsibilities include procedures and protocols
   
What do you mean by "procedures"? Operational guidance?
   
   - Determine MPLS-specific aspects of traffic engineering including
     for multi-areas/multi-AS scenarios in cooperation with the TEAS 
     working group.

As with the CCAMP charter, I'm a bit mystified by the word "Determine"
here. What exactly does the WG do on this point?



From nobody Mon Nov 24 09:01:01 2014
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I had some discussion with Pete about this on jabber.
The problem comes because it appears from the first sentence that the =
MPLS WG might be making decisions and documenting them outside the =
responsibility of TEAS to act as the focus for coordination.
Therefore, I propose the following modification...

  - Coordinate the work on RSVP-TE with CCAMP and TEAS. In the cases
    where there is an overlap, generic parts will be done by the TEAS
    working group, MPLS data plane specific parts will be done by the
    MPLS working group, and support for any other specific data planes
    will be done by the CCAMP working group. The TEAS working group acts
    as the focus for coordinating this work, and the MPLS working group=20
    will note agreements about work to be done in this working group
    through milestones in this charter.

Adrian


From nobody Mon Nov 24 10:14:37 2014
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From: Katherine Zhao <Katherine.Zhao@huawei.com>
To: Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] poll to see if we have consensus to adopt draft-akiya-mpls-entropy-lsp-ping
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Subject: Re: [mpls] poll to see if we have consensus to adopt draft-akiya-mpls-entropy-lsp-ping
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Support.

Thanks,
Katherine

-----Original Message-----
From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson
Sent: Saturday, November 22, 2014 9:09 PM
To: mpls@ietf.org
Cc: mpls-chairs@tools.ietf.org; draft-akiya-mpls-entropy-lsp-ping@tools.iet=
f.org
Subject: [mpls] poll to see if we have consensus to adopt draft-akiya-mpls-=
entropy-lsp-ping

Working Group,

This is to start a two week poll on adopting
draft-akiya-mpls-entropy-lsp-ping-04 as an MPLS working group document.

A bit if background, we had this document almost ready to go to the working=
 group adoption poll, but a discussion between authors and chairs converged=
 on that it would be beneficial to have to new IANA registries set up. Sinc=
e those registries would include code points defined in other documents we =
could not define the registries in the current document. We now have draft-=
ietf-mpls-lsp-ping-registry adopted as a working group document, and can no=
w progress draft-akiya-mpls-entropy- lsp-ping.

Please send your comments (support/not support) to the mpls working group m=
ailing list (mpls@ietf.org). Please give a technical motivation for your su=
pport/not support, especially if you think that the document should not be =
adopted as a working group document.

There is two IPR disclosures directly against this document.

The authors has all stated on the working group mailing list that they are =
unaware of any other IPR claims against this draft than the two disclosed.

However if you are on the the mpls working group mailing list and aware of =
IPR that relates to this draft, the time to disclose this is now.

This poll ends December 8, 2014.

/Loa
--=20


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64

_______________________________________________
mpls mailing list
mpls@ietf.org
https://www.ietf.org/mailman/listinfo/mpls


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From: Pete Resnick <presnick@qti.qualcomm.com>
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On 11/24/14 11:00 AM, Adrian Farrel wrote:
> I had some discussion with Pete about this on jabber.
> The problem comes because it appears from the first sentence that the MPLS WG might be making decisions and documenting them outside the responsibility of TEAS to act as the focus for coordination.
> Therefore, I propose the following modification...
>
>    - Coordinate the work on RSVP-TE with CCAMP and TEAS. In the cases
>      where there is an overlap, generic parts will be done by the TEAS
>      working group, MPLS data plane specific parts will be done by the
>      MPLS working group, and support for any other specific data planes
>      will be done by the CCAMP working group. The TEAS working group acts
>      as the focus for coordinating this work, and the MPLS working group
>      will note agreements about work to be done in this working group
>      through milestones in this charter.
>    

I think we can get a better word than "focus" in that last sentence, 
but, even if we can't, this addresses the blocking portion of my comments.

pr

-- 
Pete Resnick<http://www.qualcomm.com/~presnick/>
Qualcomm Technologies, Inc. - +1 (858)651-4478


From nobody Mon Nov 24 13:07:27 2014
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Stephen Farrell has entered the following ballot position for
charter-ietf-mpls-06-04: Yes

When responding, please keep the subject line intact and reply to all
email addresses included in the To and CC lines. (Feel free to cut this
introductory paragraph, however.)



The document, along with other ballot positions, can be found here:
http://datatracker.ietf.org/doc/charter-ietf-mpls/



----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------


How can I resist when it says; 

- Document mechanisms for securing MPLS protocols and data plane.

:-)



From nobody Mon Nov 24 13:23:19 2014
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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'Pete Resnick'" <presnick@qti.qualcomm.com>
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> I think we can get a better word than "focus" in that last sentence,

Suggestions?
I have antipenumbrify, but that is probably not at the top of your list.

> but, even if we can't, this addresses the blocking portion of my comments.

Change not yet made.
I'm just letting this soak in case the WG comments.

A


From nobody Mon Nov 24 14:03:26 2014
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Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Date: Mon, 24 Nov 2014 17:14:41 -0500
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Subject: Re: [mpls] Pete Resnick's Block on charter-ietf-mpls-06-04: (with BLOCK and COMMENT)
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"hub"?

Cheers,
Andy

On Mon, Nov 24, 2014 at 4:23 PM, Adrian Farrel <adrian@olddog.co.uk> wrote:

> > I think we can get a better word than "focus" in that last sentence,
>
> Suggestions?
> I have antipenumbrify, but that is probably not at the top of your list.
>
> > but, even if we can't, this addresses the blocking portion of my
> comments.
>
> Change not yet made.
> I'm just letting this soak in case the WG comments.
>
> A
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
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<div dir=3D"ltr">&quot;hub&quot;?<div><br></div><div>Cheers,</div><div>Andy=
</div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Mo=
n, Nov 24, 2014 at 4:23 PM, Adrian Farrel <span dir=3D"ltr">&lt;<a href=3D"=
mailto:adrian@olddog.co.uk" target=3D"_blank">adrian@olddog.co.uk</a>&gt;</=
span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8e=
x;border-left:1px #ccc solid;padding-left:1ex"><span class=3D"">&gt; I thin=
k we can get a better word than &quot;focus&quot; in that last sentence,<br=
>
<br>
</span>Suggestions?<br>
I have antipenumbrify, but that is probably not at the top of your list.<br=
>
<span class=3D""><br>
&gt; but, even if we can&#39;t, this addresses the blocking portion of my c=
omments.<br>
<br>
</span>Change not yet made.<br>
I&#39;m just letting this soak in case the WG comments.<br>
<div class=3D"HOEnZb"><div class=3D"h5"><br>
A<br>
<br>
_______________________________________________<br>
mpls mailing list<br>
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<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" target=3D"_blank">ht=
tps://www.ietf.org/mailman/listinfo/mpls</a><br>
</div></div></blockquote></div><br></div>

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From nobody Mon Nov 24 15:28:23 2014
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From: Sam Aldrin <aldrin.ietf@gmail.com>
To: Ronald Bonica <rbonica@juniper.net>
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Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Hi Ron,

Thanks for the comments.
Please find my comments inline.

On Fri, Nov 21, 2014 at 1:44 PM, Ronald Bonica <rbonica@juniper.net> wrote:

>  Hi Sam,
>
>
>
> Response inline=E2=80=A6=E2=80=A6
>
>
>
> *From:* Sam Aldrin [mailto:aldrin.ietf@gmail.com]
> *Sent:* Wednesday, November 19, 2014 10:28 PM
> *To:* Ronald Bonica
> *Cc:* mpls@ietf.org
> *Subject:* Re: [mpls] draft-bonica-mpls-self-ping: Response to comments
> from the mike
>
>
>
> Hi Ron,
>
>
>
> Still trying to understand the need for the draft, hence, have few of
> questions and need clarifications. Appreciate your response in advance.
>
>
>
> 1.      (clarification q) The Ingress LSR sends the Echo request, with
> destination IP address to self, and forwards to Egress LSR (sec 2), corre=
ct?
>
> *[RPB] * Almost. The Ingress LSR sends the Echo **Reply**, with
> destination IP address to self, and forwards to Egress LSR.
>
%sam - Ah uh! Now I know why it(draft) is confusing. While when I read your
response, it says 'Echo Reply', where as draft-bonica says, 'MPLS Echo
Message'.
I believe you are actually forming 'MPLS Echo Reply' and NOT 'MPLS Echo
Request'.
In sec 2.
o Format a MPLS Echo [RFC4379] message

o  Send the MPLS Echo message through the LSP under test.


This is what is confusing. As you are referring to RFC4379, either use
MPLS Echo Request/Reply, to avoid confusion.

I understand you are just using the packet format, but there is no
definition of MPLS Echo message.


>
> 2.        Is this the only thing which identifies the Ingress LSR or
> something else too?
>
> *[RPB] The egress LSR doesn=E2=80=99t need to identify the ingress LSR. I=
t just
> forwards an IP packet based upon IP destination. The Ingress LSR identifi=
es
> the Echo Reply as one that it sent to itself by matching the Sender Handl=
e
> in the message with an LSP Ping Session ID. *
>
>
>
> 3.      What happens if there is LSP breakage or something and the Echo
> request ends up on transit LSR? Doesn't it process?
>
> *[RPB] The transit LSR forwards the Echo Reply back to the ingress. The
> ingress declares the LSP to be ready to carry traffic, even though it is
> broken. That=E2=80=99s why my original message says, **=E2=80=9C*Self Pin=
g is designed to
> verify LSP readiness without consuming control plane resources on the
> egress router. It is not designed to diagnose programming errors in which
> an LSR other than the egress de-encapsulates and forwards the packet.
> Mechanisms that diagnose such issues are available [RFC 4950]. However,
> they are more resource intensive.=E2=80=9D
>
>
>
> I see that draft says, this will avoid control plane processing. How so?
>
> *[RPB] The draft says that it avoids control plane processing on the
> egress router. The egress router never looks beyond the IP header. It
> simply forwards based upon IP destination.*
>
>
>
> The packet is forwarded from ingress to egress, which means, the egress
> will have to process the packet i.e. look up the ip address to send it ba=
ck
> to ingress.
>
> *[RPB] Yes. This happens on the forwarding plane.*
>
%sam - Could be or could punt to RP if the forwarding entry is not on the
LC.

>
>
> Draft says "The egress LSR forwards the MPLS Echo message to its
> destination, the
>
>    ingress LSR.  The egress LSR forwards the MPLS Echo message exactly
>
>    as it would forward any other packet."
>
>
>
> Could you explain, how egress forwards the packet back to ingress w/o loo=
king up the packet IP header i.e. in the data plane and no additional contr=
ol plane of OAM process?
>
>
>
>  4.      Is the assertion that, if Echo Reply is received back at the
> ingress then it is failure, rather it should receive Echo Request back at
> Ingress, correct?
>
> *[RPB] Exactly the opposite! If the Echo reply is received at the ingress=
,
> that is success*
>
%sam - In the above answer, the echo reply could also be looped back from a
transit, not necessarily egress. How you define success in that case?


>
> 5.      Why can't you use LSP proxy ping to self via Egress?
>
> *[RPB] The procedures described in Section 3.2.1 of *draft-ietf-mpls-prox=
y-lsp-ping consume control plane resources on the egress LSR.
>
> %sam - Have you done any quantitative study with existing LSP ping (w/o
FEC validation) or BFD? Trying to understand how much improvement this new
mechanism is bringing.

%sam - In addition, what if the egress lsr for the lsp is not in the same
domain and may not have routable address? In otherwords, Echo reply is not
received and timesout, but the RESV message is already received back at
ingress.

cheers
-sam

>
>
>                                 ROn
>
>
>
>
>
> Will followup with additional questions, if any, based on your responses.
>
>
>
> cheers
>
> -sam
>
>
>
>  On Nov 19, 2014, at 8:38 AM, Ronald Bonica <rbonica@juniper.net> wrote:
>
>
>
> Folks
>
> At IETF 91, the following points were raised with regard to
> draft-bonica-mpls-self-ping:
>
> 1) Why not use BFD?
> 2) Self-ping does not diagnose FIB programming errors in which an LSR
> other than the egress de-encapsulates and forwards the packet.
> 3) How does Self ping verify a bidirectional LSP's readiness to carry
> traffic in both directions?
> 4) Why does MPLS Self ping use MPLS Echo packets, as opposed to ICMP echo
> packets or some other packet format?
>
> Responses follow:
>
> 1) Why not use BFD?
>
> Self Ping is an extremely light-weight protocol. A typical Self Ping
> session emits one or two packets and terminates less than one second afte=
r
> initiation. Self-ping requires no configuration or control plane resource=
s
> on the egress LSR.
>
> By contrast, BFD is designed to verify bi-directional connectivity over a
> longer period of time. Therefore, MPLS Self Ping is appropriate in
> environments where BFD is too resource intensive.
>
> 2) Self-ping does not diagnose programming errors in which an LSR other
> than the egress de-encapsulates and forwards the packet.
>
> Self Ping is designed to verify LSP readiness without consuming control
> plane resources on the egress router. It is not designed to diagnose
> programming errors in which an LSR other than the egress de-encapsulates
> and forwards the packet. Mechanisms that diagnose such issues are availab=
le
> [RFC 4950]. However, they are more resource intensive.
>
> 3) How does Self ping verify a bidirectional LSP's readiness to carry
> traffic in both directions?
>
> In order to verify bidirectional LSP readiness, RSVP instantiates two LSP
> Self Ping sessions, one at each end of the LSP. The LSR at one end of the
> LSP initiates a self ping session when it receives a RESV message. The LS=
R
> at the other end of the LSP initiates a Self Ping Session when it sends a
> RESV message. Each LSP endpoint forwards traffic over the LSP only after
> the LSP Self Ping session terminates successfully
>
> 4) Why does LSP Self Ping use MPLS Echo packets, as opposed to some other
> packet format?
>
> LSP Self Ping could have used many packet formats. The only hard
> requirement was to have one 64-bit field in which the 64 bit session
> identifier could be encoded. The MPLS Echo packet was convenient because
> its Senders Handle is 64-bits long.
>
> I will update the draft to reflect this information.
>
> Ron Bonica
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>
>
>

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<div dir=3D"ltr">Hi Ron,<div><br></div><div>Thanks for the comments.</div><=
div>Please find my comments inline.</div><div class=3D"gmail_extra"><br><di=
v class=3D"gmail_quote">On Fri, Nov 21, 2014 at 1:44 PM, Ronald Bonica <spa=
n dir=3D"ltr">&lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"_blank">=
rbonica@juniper.net</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quo=
te" style=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-col=
or:rgb(204,204,204);border-left-style:solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)">Hi Sam,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)">Response inline=E2=80=A6=E2=80=A6<u></u><u><=
/u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
<div style=3D"border-style:none none none solid;border-left-color:blue;bord=
er-left-width:1.5pt;padding:0in 0in 0in 4pt">
<div>
<div style=3D"border-style:solid none none;border-top-color:rgb(225,225,225=
);border-top-width:1pt;padding:3pt 0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:11pt;font-family:Calibri=
,sans-serif">From:</span></b><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif"> Sam Aldrin [mailto:<a href=3D"mailto:aldrin.ietf@gmail.com=
" target=3D"_blank">aldrin.ietf@gmail.com</a>]
<br>
<b>Sent:</b> Wednesday, November 19, 2014 10:28 PM<br>
<b>To:</b> Ronald Bonica<br>
<b>Cc:</b> <a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org=
</a><span class=3D""><br>
<b>Subject:</b> Re: [mpls] draft-bonica-mpls-self-ping: Response to comment=
s from the mike<u></u><u></u></span></span></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Hi Ron,<u></u><u></u></p><span class=3D"">
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Still trying to understand the need for the draft, h=
ence, have few of questions and need clarifications. Appreciate your respon=
se in advance.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</span><div><span class=3D"">
<p><u></u><span>1.<span style=3D"font-style:normal;font-variant:normal;font=
-weight:normal;font-size:7pt;line-height:normal;font-family:&#39;Times New =
Roman&#39;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span><u></u>(clarification q) The Ingress LSR sends the Echo reque=
st, with destination IP address to self, and forwards to Egress LSR (sec 2)=
, correct?<span style=3D"color:rgb(31,73,125)"><u></u><u></u></span></p>
</span><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-fami=
ly:Calibri,sans-serif;color:rgb(31,73,125)">[RPB]
</span></i></b>=C2=A0Almost. The Ingress LSR sends the Echo *<b>Reply</b>*,=
 with destination IP address to self, and forwards to Egress LSR.</p></div>=
</div></div></div></blockquote><div>%sam - Ah uh! Now I know why it(draft) =
is confusing. <span style=3D"font-size:13px;color:rgb(0,0,0);line-height:1.=
2em">While when I read your response, it says &#39;Echo Reply&#39;, where a=
s draft-bonica says, &#39;MPLS Echo Message&#39;.=C2=A0</span>=C2=A0</div><=
div>I believe you are actually forming &#39;MPLS Echo Reply&#39; and NOT &#=
39;MPLS Echo Request&#39;.</div><div>In sec 2.=C2=A0</div><div><span style=
=3D"color:rgb(0,0,0);font-size:13px;line-height:1.2em">o  Format a MPLS Ech=
o [RFC4379] message</span></div><pre style=3D"line-height:1.2em;margin-top:=
0px;margin-bottom:0px;color:rgb(0,0,0);font-size:13px">o  Send the MPLS Ech=
o message through the LSP under test.</pre><pre style=3D"line-height:1.2em;=
margin-top:0px;margin-bottom:0px;color:rgb(0,0,0);font-size:13px"><br></pre=
><pre style=3D"line-height:1.2em;margin-top:0px;margin-bottom:0px;color:rgb=
(0,0,0);font-size:13px">This is what is confusing. As you are referring to =
RFC4379, either use MPLS Echo Request/Reply, to avoid confusion.</pre><pre =
style=3D"line-height:1.2em;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0=
);font-size:13px">I understand you are just using the packet format, but th=
ere is no definition of MPLS Echo message.</pre><blockquote class=3D"gmail_=
quote" style=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-=
color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div lang=
=3D"EN-US" link=3D"blue" vlink=3D"purple"><div><div style=3D"border-style:n=
one none none solid;border-left-color:blue;border-left-width:1.5pt;padding:=
0in 0in 0in 4pt"><div><p class=3D"MsoNormal"><u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p><u></u><span>2.<span style=3D"font-style:normal;font-variant:normal;font=
-weight:normal;font-size:7pt;line-height:normal;font-family:&#39;Times New =
Roman&#39;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span><u></u>=C2=A0=C2=A0Is this the only thing which identifies th=
e Ingress LSR or something else too?<u></u><u></u></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif;color:rgb(31,73,125)">[RPB] The egress LSR doesn=E2=80=99t n=
eed to identify the ingress LSR. It just forwards an IP packet based upon I=
P destination. The Ingress LSR identifies the Echo
 Reply as one that it sent to itself by matching the Sender Handle in the m=
essage with an LSP Ping Session ID.
<u></u><u></u></span></i></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p style=3D"margin-left:41.25pt">
<u></u><span>3.<span style=3D"font-style:normal;font-variant:normal;font-we=
ight:normal;font-size:7pt;line-height:normal;font-family:&#39;Times New Rom=
an&#39;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span><u></u>What happens if there is LSP breakage or something and=
 the Echo request ends up on transit LSR? Doesn&#39;t it process?
<span style=3D"color:rgb(31,73,125)"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif;color:rgb(31,73,125)">[RPB] The transit LSR forwards the Ech=
o Reply back to the ingress. The ingress declares the LSP to be ready to ca=
rry traffic, even though it is broken.
 That=E2=80=99s why my original message says, </span></i></b><b><i><span st=
yle=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,78,121)">=
=E2=80=9C</span></i></b><span style=3D"font-size:11pt;font-family:Calibri,s=
ans-serif;color:rgb(31,78,121)">Self
 Ping is designed to verify LSP readiness without consuming control plane r=
esources on the egress router. It is not designed to diagnose programming e=
rrors in which an LSR other than the egress de-encapsulates and forwards th=
e packet. Mechanisms that diagnose
 such issues are available [RFC 4950]. However, they are more resource inte=
nsive.=E2=80=9D<u></u><u></u></span></p><span class=3D"">
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></i></b></p=
>
<p class=3D"MsoNormal">I see that draft says, this will avoid control plane=
 processing. How so?<span style=3D"color:rgb(31,73,125)"><u></u><u></u></sp=
an></p>
</span><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-fami=
ly:Calibri,sans-serif;color:rgb(31,73,125)">[RPB] The draft says that it av=
oids control plane processing on the egress router. The egress router never=
 looks beyond the IP header. It simply forwards
 based upon IP destination.<u></u><u></u></span></i></b></p><span class=3D"=
">
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></i></b></p=
>
<p class=3D"MsoNormal">The packet is forwarded from ingress to egress, whic=
h means, the egress will have to process the packet i.e. look up the ip add=
ress to send it back to ingress.<u></u><u></u></p>
</span><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-fami=
ly:Calibri,sans-serif;color:rgb(31,73,125)">[RPB] Yes. This happens on the =
forwarding plane.</span></i></b></p></div></div></div></div></blockquote><d=
iv>%sam - Could be or could punt to RP if the forwarding entry is not on th=
e LC.=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px =
0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-l=
eft-style:solid;padding-left:1ex"><div lang=3D"EN-US" link=3D"blue" vlink=
=3D"purple"><div><div style=3D"border-style:none none none solid;border-lef=
t-color:blue;border-left-width:1.5pt;padding:0in 0in 0in 4pt"><div><p class=
=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)"><u></u><u></u></span></p>
</div><span class=3D"">
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Draft says &quot;<span style=3D"font-size:10pt">The =
egress LSR forwards the MPLS Echo message to its destination, the</span><u>=
</u><u></u></p>
</div>
<pre style=3D"line-height:14.4pt">=C2=A0=C2=A0 ingress LSR.=C2=A0 The egres=
s LSR forwards the MPLS Echo message exactly<u></u><u></u></pre>
<pre style=3D"line-height:14.4pt">=C2=A0=C2=A0 as it would forward any othe=
r packet.&quot;<u></u><u></u></pre>
<pre style=3D"line-height:14.4pt"><u></u>=C2=A0<u></u></pre>
<pre style=3D"line-height:14.4pt">Could you explain, how egress forwards th=
e packet back to ingress w/o looking up the packet IP header i.e. in the da=
ta plane and no additional control plane of OAM process?<span style=3D"colo=
r:rgb(31,73,125)"><u></u><u></u></span></pre>
<pre style=3D"line-height:14.4pt"><span style=3D"font-size:11pt;font-family=
:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></pre>
</span><div>
<p style=3D"margin-left:41.25pt">
<u></u><span>4.<span style=3D"font-style:normal;font-variant:normal;font-we=
ight:normal;font-size:7pt;line-height:normal;font-family:&#39;Times New Rom=
an&#39;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span><u></u>Is the assertion that, if Echo Reply is received back =
at the ingress then it is failure, rather it should receive Echo Request ba=
ck at Ingress, correct?<span style=3D"color:rgb(31,73,125)"><u></u><u></u><=
/span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif;color:rgb(31,73,125)">[RPB] Exactly the opposite! If the Ech=
o reply is received at the ingress, that is success</span></i></b></p></div=
></div></div></div></blockquote><div>%sam - In the above answer, the echo r=
eply could also be looped back from a transit, not necessarily egress. How =
you define success in that case?</div><div><br></div><blockquote class=3D"g=
mail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;border-=
left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div =
lang=3D"EN-US" link=3D"blue" vlink=3D"purple"><div><div style=3D"border-sty=
le:none none none solid;border-left-color:blue;border-left-width:1.5pt;padd=
ing:0in 0in 0in 4pt"><div><p class=3D"MsoNormal"><b><i><span style=3D"font-=
size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u><u></=
u></span></i></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p style=3D"margin-left:41.25pt">
<u></u><span>5.<span style=3D"font-style:normal;font-variant:normal;font-we=
ight:normal;font-size:7pt;line-height:normal;font-family:&#39;Times New Rom=
an&#39;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span><u></u>Why can&#39;t you use LSP proxy ping to self via Egres=
s?<span style=3D"color:rgb(31,73,125)"><u></u><u></u></span></p>
<pre style=3D"line-height:14.4pt"><b><i><span style=3D"font-size:11pt;font-=
family:Calibri,sans-serif;color:rgb(31,73,125)">[RPB] The procedures descri=
bed in Section 3.2.1 of </span></i></b><span style=3D"color:black">draft-ie=
tf-mpls-proxy-lsp-ping consume control plane resources on the egress LSR.</=
span></pre></div></div></div></div></blockquote><div>%sam - Have you done a=
ny quantitative study with existing LSP ping (w/o FEC validation) or BFD? T=
rying to understand how much improvement this new mechanism is bringing.</d=
iv><div><br></div><div>%sam - In addition, what if the egress lsr for the l=
sp is not in the same domain and may not have routable address? In otherwor=
ds, Echo reply is not received and timesout, but the RESV message is alread=
y received back at ingress.=C2=A0</div><div><br></div><div>cheers</div><div=
>-sam</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.=
8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-st=
yle:solid;padding-left:1ex"><div lang=3D"EN-US" link=3D"blue" vlink=3D"purp=
le"><div><div style=3D"border-style:none none none solid;border-left-color:=
blue;border-left-width:1.5pt;padding:0in 0in 0in 4pt"><div><pre style=3D"li=
ne-height:14.4pt"><span style=3D"color:black"><u></u><u></u></span></pre>
<pre style=3D"line-height:14.4pt"><span style=3D"color:black"><u></u>=C2=A0=
<u></u></span></pre>
<pre style=3D"line-height:14.4pt"><span style=3D"color:black">=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 ROn<u></u><u></u></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
</div><div><div class=3D"h5">
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Will followup with additional questions, if any, bas=
ed on your responses.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">cheers<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">-sam<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<p class=3D"MsoNormal">On Nov 19, 2014, at 8:38 AM, Ronald Bonica &lt;<a hr=
ef=3D"mailto:rbonica@juniper.net" target=3D"_blank">rbonica@juniper.net</a>=
&gt; wrote:<u></u><u></u></p>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">Folks<br>
<br>
At IETF 91, the following points were raised with regard to draft-bonica-mp=
ls-self-ping:<br>
<br>
1) Why not use BFD?<br>
2) Self-ping does not diagnose FIB programming errors in which an LSR other=
 than the egress de-encapsulates and forwards the packet.<br>
3) How does Self ping verify a bidirectional LSP&#39;s readiness to carry t=
raffic in both directions?<br>
4) Why does MPLS Self ping use MPLS Echo packets, as opposed to ICMP echo p=
ackets or some other packet format?<br>
<br>
Responses follow:<br>
<br>
1) Why not use BFD?<br>
<br>
Self Ping is an extremely light-weight protocol. A typical Self Ping sessio=
n emits one or two packets and terminates less than one second after initia=
tion. Self-ping requires no configuration or control plane resources on the=
 egress LSR.
<br>
<br>
By contrast, BFD is designed to verify bi-directional connectivity over a l=
onger period of time. Therefore, MPLS Self Ping is appropriate in environme=
nts where BFD is too resource intensive.<br>
<br>
2) Self-ping does not diagnose programming errors in which an LSR other tha=
n the egress de-encapsulates and forwards the packet.<br>
<br>
Self Ping is designed to verify LSP readiness without consuming control pla=
ne resources on the egress router. It is not designed to diagnose programmi=
ng errors in which an LSR other than the egress de-encapsulates and forward=
s the packet. Mechanisms that diagnose
 such issues are available [RFC 4950]. However, they are more resource inte=
nsive.<br>
<br>
3) How does Self ping verify a bidirectional LSP&#39;s readiness to carry t=
raffic in both directions?<br>
<br>
In order to verify bidirectional LSP readiness, RSVP instantiates two LSP S=
elf Ping sessions, one at each end of the LSP. The LSR at one end of the LS=
P initiates a self ping session when it receives a RESV message. The LSR at=
 the other end of the LSP initiates
 a Self Ping Session when it sends a RESV message. Each LSP endpoint forwar=
ds traffic over the LSP only after the LSP Self Ping session terminates suc=
cessfully<br>
<br>
4) Why does LSP Self Ping use MPLS Echo packets, as opposed to some other p=
acket format?<br>
<br>
LSP Self Ping could have used many packet formats. The only hard requiremen=
t was to have one 64-bit field in which the 64 bit session identifier could=
 be encoded. The MPLS Echo packet was convenient because its Senders Handle=
 is 64-bits long.
<br>
<br>
I will update the draft to reflect this information.<br>
<br>
Ron Bonica<br>
<br>
_______________________________________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" target=3D"_blank">ht=
tps://www.ietf.org/mailman/listinfo/mpls</a><u></u><u></u></p>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div></div></div>
</div>
</div>

</blockquote></div><br></div></div>

--001a1134f6e61b0bdb0508a32669--


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From: Mach Chen <mach.chen@huawei.com>
To: Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] poll to see if we have consensus to adopt draft-akiya-mpls-entropy-lsp-ping
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Date: Tue, 25 Nov 2014 01:20:12 +0000
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Subject: Re: [mpls] poll to see if we have consensus to adopt draft-akiya-mpls-entropy-lsp-ping
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Yes/support.

I have read the draft, it's useful.

Best regards,
Mach

> -----Original Message-----
> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson
> Sent: Sunday, November 23, 2014 1:09 PM
> To: mpls@ietf.org
> Cc: mpls-chairs@tools.ietf.org; draft-akiya-mpls-entropy-lsp-ping@tools.i=
etf.org
> Subject: [mpls] poll to see if we have consensus to adopt
> draft-akiya-mpls-entropy-lsp-ping
>=20
> Working Group,
>=20
> This is to start a two week poll on adopting
> draft-akiya-mpls-entropy-lsp-ping-04 as an MPLS working group document.
>=20
> A bit if background, we had this document almost ready to go to the worki=
ng
> group adoption poll, but a discussion between authors and chairs converge=
d on
> that it would be beneficial to have to new IANA registries set up. Since =
those
> registries would include code points defined in other documents we could =
not
> define the registries in the current document. We now have
> draft-ietf-mpls-lsp-ping-registry adopted as a working group document, an=
d can
> now progress draft-akiya-mpls-entropy- lsp-ping.
>=20
> Please send your comments (support/not support) to the mpls working group
> mailing list (mpls@ietf.org). Please give a technical motivation for your
> support/not support, especially if you think that the document should not=
 be
> adopted as a working group document.
>=20
> There is two IPR disclosures directly against this document.
>=20
> The authors has all stated on the working group mailing list that they ar=
e unaware
> of any other IPR claims against this draft than the two disclosed.
>=20
> However if you are on the the mpls working group mailing list and aware o=
f IPR
> that relates to this draft, the time to disclose this is now.
>=20
> This poll ends December 8, 2014.
>=20
> /Loa
> --
>=20
>=20
> Loa Andersson                        email: loa@mail01.huawei.com
> Senior MPLS Expert                          loa@pi.nu
> Huawei Technologies (consultant)     phone: +46 739 81 21 64
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls


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From: "Nobo Akiya (nobo)" <nobo@cisco.com>
To: Ronald Bonica <rbonica@juniper.net>, "Shah, Himanshu" <hshah@ciena.com>, "Thomas D. Nadeau" <tnadeau@lucidvision.com>, Sam Aldrin <aldrin.ietf@gmail.com>
Thread-Topic: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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From nobody Mon Nov 24 17:58:13 2014
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Date: Tue, 25 Nov 2014 09:57:47 +0800
From: Loa Andersson <loa@pi.nu>
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Subject: Re: [mpls] Pete Resnick's Block on charter-ietf-mpls-06-04: (with BLOCK and COMMENT)
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Adrian,

possibly nit picking, but ...

On 2014-11-25 01:00, Adrian Farrel wrote:
> I had some discussion with Pete about this on jabber.
> The problem comes because it appears from the first sentence that the MPLS WG might be making decisions and documenting them outside the responsibility of TEAS to act as the focus for coordination.
> Therefore, I propose the following modification...
>
>    - Coordinate the work on RSVP-TE with CCAMP and TEAS. In the cases
>      where there is an overlap, generic parts will be done by the TEAS
>      working group, MPLS data plane specific parts will be done by the
>      MPLS working group, and support for any other specific data planes
>      will be done by the CCAMP working group. The TEAS working group acts
>      as the focus for coordinating this work, and the MPLS working group

OLD
>      will note agreements about work to be done in this working group
>      through milestones in this charter.

NEW
        will track agreements about work to be done by the MPLS working
        group as milestones in the working group charter.

/Loa
>
> Adrian
>

-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


From nobody Mon Nov 24 18:42:53 2014
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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: Sam Aldrin <aldrin.ietf@gmail.com>, Ronald Bonica <rbonica@juniper.net>
Thread-Topic: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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--_000_D09951A671955cpignataciscocom_
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Hi, Ron, Sam,

Joining the discussion late. I did want to point out a couple of additional=
 considerations, I believe these have not been mentioned yet, apologies if =
they have:

  1.  If the packet is an MPLS Echo Request, from S4.3 of RFC4379, =93The R=
outer Alert option MUST be set in the IP header.=94 In that case, the egres=
s will do some processing, punt to a slower path, examine more closely, fol=
low RFC4379=92s procedures, might not like the pak.
  2.  If the packet is an MPLS Echo Reply, it cannot be sent, because from =
S4.5 of RFC4379 =93It MUST ONLY be sent in response to an MPLS echo request=
.=94
  3.  In both #1 and #2, there are some potential issues with following the=
 RFC4379 processing. However,
  4.  There is nothing preventing you from defining a new Message Type of =
=93MPLS echo self-ping=94 in some friendly range, and specifying the proced=
ures. The caveats of not detecting an LSP broken mid-way that puts the IP p=
acket on the data plane and others still apply to this (unless there is som=
e control plane processing on the LSP egress, which defeats the purpose.

Thanks,

Carlos.

From: Sam Aldrin <aldrin.ietf@gmail.com<mailto:aldrin.ietf@gmail.com>>
Date: Monday, November 24, 2014 at 6:28 PM
To: Ronald Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>
Cc: "mpls@ietf.org<mailto:mpls@ietf.org>" <mpls@ietf.org<mailto:mpls@ietf.o=
rg>>
Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from =
the mike

Hi Ron,

Thanks for the comments.
Please find my comments inline.

On Fri, Nov 21, 2014 at 1:44 PM, Ronald Bonica <rbonica@juniper.net<mailto:=
rbonica@juniper.net>> wrote:
Hi Sam,

Response inline=85=85

From: Sam Aldrin [mailto:aldrin.ietf@gmail.com<mailto:aldrin.ietf@gmail.com=
>]
Sent: Wednesday, November 19, 2014 10:28 PM
To: Ronald Bonica
Cc: mpls@ietf.org<mailto:mpls@ietf.org>
Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from =
the mike

Hi Ron,

Still trying to understand the need for the draft, hence, have few of quest=
ions and need clarifications. Appreciate your response in advance.


1.      (clarification q) The Ingress LSR sends the Echo request, with dest=
ination IP address to self, and forwards to Egress LSR (sec 2), correct?
[RPB]  Almost. The Ingress LSR sends the Echo *Reply*, with destination IP =
address to self, and forwards to Egress LSR.
%sam - Ah uh! Now I know why it(draft) is confusing. While when I read your=
 response, it says 'Echo Reply', where as draft-bonica says, 'MPLS Echo Mes=
sage'.
I believe you are actually forming 'MPLS Echo Reply' and NOT 'MPLS Echo Req=
uest'.
In sec 2.
o Format a MPLS Echo [RFC4379] message

o  Send the MPLS Echo message through the LSP under test.


This is what is confusing. As you are referring to RFC4379, either use MPLS=
 Echo Request/Reply, to avoid confusion.

I understand you are just using the packet format, but there is no definiti=
on of MPLS Echo message.


2.        Is this the only thing which identifies the Ingress LSR or someth=
ing else too?
[RPB] The egress LSR doesn=92t need to identify the ingress LSR. It just fo=
rwards an IP packet based upon IP destination. The Ingress LSR identifies t=
he Echo Reply as one that it sent to itself by matching the Sender Handle i=
n the message with an LSP Ping Session ID.


3.      What happens if there is LSP breakage or something and the Echo req=
uest ends up on transit LSR? Doesn't it process?
[RPB] The transit LSR forwards the Echo Reply back to the ingress. The ingr=
ess declares the LSP to be ready to carry traffic, even though it is broken=
. That=92s why my original message says, =93Self Ping is designed to verify=
 LSP readiness without consuming control plane resources on the egress rout=
er. It is not designed to diagnose programming errors in which an LSR other=
 than the egress de-encapsulates and forwards the packet. Mechanisms that d=
iagnose such issues are available [RFC 4950]. However, they are more resour=
ce intensive.=94

I see that draft says, this will avoid control plane processing. How so?
[RPB] The draft says that it avoids control plane processing on the egress =
router. The egress router never looks beyond the IP header. It simply forwa=
rds based upon IP destination.

The packet is forwarded from ingress to egress, which means, the egress wil=
l have to process the packet i.e. look up the ip address to send it back to=
 ingress.
[RPB] Yes. This happens on the forwarding plane.
%sam - Could be or could punt to RP if the forwarding entry is not on the L=
C.

Draft says "The egress LSR forwards the MPLS Echo message to its destinatio=
n, the

   ingress LSR.  The egress LSR forwards the MPLS Echo message exactly

   as it would forward any other packet."



Could you explain, how egress forwards the packet back to ingress w/o looki=
ng up the packet IP header i.e. in the data plane and no additional control=
 plane of OAM process?



4.      Is the assertion that, if Echo Reply is received back at the ingres=
s then it is failure, rather it should receive Echo Request back at Ingress=
, correct?
[RPB] Exactly the opposite! If the Echo reply is received at the ingress, t=
hat is success
%sam - In the above answer, the echo reply could also be looped back from a=
 transit, not necessarily egress. How you define success in that case?



5.      Why can't you use LSP proxy ping to self via Egress?

[RPB] The procedures described in Section 3.2.1 of draft-ietf-mpls-proxy-ls=
p-ping consume control plane resources on the egress LSR.

%sam - Have you done any quantitative study with existing LSP ping (w/o FEC=
 validation) or BFD? Trying to understand how much improvement this new mec=
hanism is bringing.

%sam - In addition, what if the egress lsr for the lsp is not in the same d=
omain and may not have routable address? In otherwords, Echo reply is not r=
eceived and timesout, but the RESV message is already received back at ingr=
ess.

cheers
-sam



                                ROn


Will followup with additional questions, if any, based on your responses.

cheers
-sam

On Nov 19, 2014, at 8:38 AM, Ronald Bonica <rbonica@juniper.net<mailto:rbon=
ica@juniper.net>> wrote:

Folks

At IETF 91, the following points were raised with regard to draft-bonica-mp=
ls-self-ping:

1) Why not use BFD?
2) Self-ping does not diagnose FIB programming errors in which an LSR other=
 than the egress de-encapsulates and forwards the packet.
3) How does Self ping verify a bidirectional LSP's readiness to carry traff=
ic in both directions?
4) Why does MPLS Self ping use MPLS Echo packets, as opposed to ICMP echo p=
ackets or some other packet format?

Responses follow:

1) Why not use BFD?

Self Ping is an extremely light-weight protocol. A typical Self Ping sessio=
n emits one or two packets and terminates less than one second after initia=
tion. Self-ping requires no configuration or control plane resources on the=
 egress LSR.

By contrast, BFD is designed to verify bi-directional connectivity over a l=
onger period of time. Therefore, MPLS Self Ping is appropriate in environme=
nts where BFD is too resource intensive.

2) Self-ping does not diagnose programming errors in which an LSR other tha=
n the egress de-encapsulates and forwards the packet.

Self Ping is designed to verify LSP readiness without consuming control pla=
ne resources on the egress router. It is not designed to diagnose programmi=
ng errors in which an LSR other than the egress de-encapsulates and forward=
s the packet. Mechanisms that diagnose such issues are available [RFC 4950]=
. However, they are more resource intensive.

3) How does Self ping verify a bidirectional LSP's readiness to carry traff=
ic in both directions?

In order to verify bidirectional LSP readiness, RSVP instantiates two LSP S=
elf Ping sessions, one at each end of the LSP. The LSR at one end of the LS=
P initiates a self ping session when it receives a RESV message. The LSR at=
 the other end of the LSP initiates a Self Ping Session when it sends a RES=
V message. Each LSP endpoint forwards traffic over the LSP only after the L=
SP Self Ping session terminates successfully

4) Why does LSP Self Ping use MPLS Echo packets, as opposed to some other p=
acket format?

LSP Self Ping could have used many packet formats. The only hard requiremen=
t was to have one 64-bit field in which the 64 bit session identifier could=
 be encoded. The MPLS Echo packet was convenient because its Senders Handle=
 is 64-bits long.

I will update the draft to reflect this information.

Ron Bonica

_______________________________________________
mpls mailing list
mpls@ietf.org<mailto:mpls@ietf.org>
https://www.ietf.org/mailman/listinfo/mpls



--_000_D09951A671955cpignataciscocom_
Content-Type: text/html; charset="Windows-1252"
Content-ID: <477983B5F7D2334286CBAF70D816F72D@emea.cisco.com>
Content-Transfer-Encoding: quoted-printable

<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DWindows-1=
252">
</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin=
e-break: after-white-space; font-size: 14px; font-family: Calibri, sans-ser=
if; color: rgb(0, 0, 0);">
<div>Hi, Ron, Sam,</div>
<div><br>
</div>
<div>Joining the discussion late. I did want to point out a couple of addit=
ional considerations, I believe these have not been mentioned yet, apologie=
s if they have:</div>
<ol>
<li>If the packet is an MPLS Echo Request, from S4.3 of RFC4379, =93The Rou=
ter Alert option MUST be set in the IP header.=94 In that case, the egress =
will do some processing, punt to a slower path, examine more closely, follo=
w RFC4379=92s procedures, might not like
 the pak.</li><li>If the packet is an MPLS Echo Reply, it cannot be sent, b=
ecause from S4.5 of RFC4379 =93It MUST ONLY be sent in response&nbsp;to an =
MPLS echo request.=94</li><li>In both #1 and #2, there are some potential i=
ssues with following the RFC4379 processing. However,</li><li>There is noth=
ing preventing you from defining a new&nbsp;Message Type of =93MPLS echo se=
lf-ping=94 in some friendly range, and specifying the procedures. The cavea=
ts of not detecting an LSP broken mid-way that puts the IP packet on the da=
ta plane and others still
 apply to this (unless there is some control plane processing on the LSP eg=
ress, which defeats the purpose.</li></ol>
<div>Thanks,</div>
<div><br>
</div>
<div>Carlos.</div>
<div><br>
</div>
<span id=3D"OLK_SRC_BODY_SECTION">
<div style=3D"font-family:Calibri; font-size:11pt; text-align:left; color:b=
lack; BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM:=
 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid;=
 BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<span style=3D"font-weight:bold">From: </span>Sam Aldrin &lt;<a href=3D"mai=
lto:aldrin.ietf@gmail.com">aldrin.ietf@gmail.com</a>&gt;<br>
<span style=3D"font-weight:bold">Date: </span>Monday, November 24, 2014 at =
6:28 PM<br>
<span style=3D"font-weight:bold">To: </span>Ronald Bonica &lt;<a href=3D"ma=
ilto:rbonica@juniper.net">rbonica@juniper.net</a>&gt;<br>
<span style=3D"font-weight:bold">Cc: </span>&quot;<a href=3D"mailto:mpls@ie=
tf.org">mpls@ietf.org</a>&quot; &lt;<a href=3D"mailto:mpls@ietf.org">mpls@i=
etf.org</a>&gt;<br>
<span style=3D"font-weight:bold">Subject: </span>Re: [mpls] draft-bonica-mp=
ls-self-ping: Response to comments from the mike<br>
</div>
<div><br>
</div>
<div>
<div>
<div dir=3D"ltr">Hi Ron,
<div><br>
</div>
<div>Thanks for the comments.</div>
<div>Please find my comments inline.</div>
<div class=3D"gmail_extra"><br>
<div class=3D"gmail_quote">On Fri, Nov 21, 2014 at 1:44 PM, Ronald Bonica <=
span dir=3D"ltr">
&lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"_blank">rbonica@junipe=
r.net</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex">
<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; font-family: Calibri=
, sans-serif; color: rgb(31, 73, 125);">Hi Sam,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; font-family: Calibri=
, sans-serif; color: rgb(31, 73, 125);"><u></u>&nbsp;<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; font-family: Calibri=
, sans-serif; color: rgb(31, 73, 125);">Response inline=85=85<u></u><u></u>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; font-family: Calibri=
, sans-serif; color: rgb(31, 73, 125);"><u></u>&nbsp;<u></u></span></p>
<div style=3D"border-style:none none none solid;border-left-color:blue;bord=
er-left-width:1.5pt;padding:0in 0in 0in 4pt">
<div>
<div style=3D"border-style:solid none none;border-top-color:rgb(225,225,225=
);border-top-width:1pt;padding:3pt 0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size: 11pt; font-family: Cali=
bri, sans-serif;">From:</span></b><span style=3D"font-size: 11pt; font-fami=
ly: Calibri, sans-serif;"> Sam Aldrin [mailto:<a href=3D"mailto:aldrin.ietf=
@gmail.com" target=3D"_blank">aldrin.ietf@gmail.com</a>]
<br>
<b>Sent:</b> Wednesday, November 19, 2014 10:28 PM<br>
<b>To:</b> Ronald Bonica<br>
<b>Cc:</b> <a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org=
</a><span class=3D""><br>
<b>Subject:</b> Re: [mpls] draft-bonica-mpls-self-ping: Response to comment=
s from the mike<u></u><u></u></span></span></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>&nbsp;<u></u></p>
<p class=3D"MsoNormal">Hi Ron,<u></u><u></u></p>
<span class=3D"">
<div>
<p class=3D"MsoNormal"><u></u>&nbsp;<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Still trying to understand the need for the draft, h=
ence, have few of questions and need clarifications. Appreciate your respon=
se in advance.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>&nbsp;<u></u></p>
</div>
</span>
<div><span class=3D"">
<p><u></u><span>1.<span style=3D"font-style: normal; font-variant: normal; =
font-weight: normal; font-size: 7pt; line-height: normal; font-family: 'Tim=
es New Roman';">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><u></u>(clarification q) The Ingress LSR sends the Echo reque=
st, with destination IP address to self, and forwards to Egress LSR (sec 2)=
, correct?<span style=3D"color:rgb(31,73,125)"><u></u><u></u></span></p>
</span>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size: 11pt; font-family: C=
alibri, sans-serif; color: rgb(31, 73, 125);">[RPB]
</span></i></b>&nbsp;Almost. The Ingress LSR sends the Echo *<b>Reply</b>*,=
 with destination IP address to self, and forwards to Egress LSR.</p>
</div>
</div>
</div>
</div>
</blockquote>
<div>%sam - Ah uh! Now I know why it(draft) is confusing. <span style=3D"fo=
nt-size:13px;color:rgb(0,0,0);line-height:1.2em">
While when I read your response, it says 'Echo Reply', where as draft-bonic=
a says, 'MPLS Echo Message'.&nbsp;</span>&nbsp;</div>
<div>I believe you are actually forming 'MPLS Echo Reply' and NOT 'MPLS Ech=
o Request'.</div>
<div>In sec 2.&nbsp;</div>
<div><span style=3D"color:rgb(0,0,0);font-size:13px;line-height:1.2em">o Fo=
rmat a MPLS Echo [RFC4379] message</span></div>
<pre style=3D"line-height:1.2em;margin-top:0px;margin-bottom:0px;color:rgb(=
0,0,0);font-size:13px">o  Send the MPLS Echo message through the LSP under =
test.</pre>
<pre style=3D"line-height:1.2em;margin-top:0px;margin-bottom:0px;color:rgb(=
0,0,0);font-size:13px"><br></pre>
<pre style=3D"line-height:1.2em;margin-top:0px;margin-bottom:0px;color:rgb(=
0,0,0);font-size:13px">This is what is confusing. As you are referring to R=
FC4379, either use MPLS Echo Request/Reply, to avoid confusion.</pre>
<pre style=3D"line-height:1.2em;margin-top:0px;margin-bottom:0px;color:rgb(=
0,0,0);font-size:13px">I understand you are just using the packet format, b=
ut there is no definition of MPLS Echo message.</pre>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex">
<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div>
<div style=3D"border-style:none none none solid;border-left-color:blue;bord=
er-left-width:1.5pt;padding:0in 0in 0in 4pt">
<div>
<p class=3D"MsoNormal"><u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>&nbsp;<u></u></p>
<p><u></u><span>2.<span style=3D"font-style: normal; font-variant: normal; =
font-weight: normal; font-size: 7pt; line-height: normal; font-family: 'Tim=
es New Roman';">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><u></u>&nbsp;&nbsp;Is this the only thing which identifies th=
e Ingress LSR or something else too?<u></u><u></u></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size: 11pt; font-family: C=
alibri, sans-serif; color: rgb(31, 73, 125);">[RPB] The egress LSR doesn=92=
t need to identify the ingress LSR. It just forwards an IP packet based upo=
n IP destination. The Ingress LSR identifies
 the Echo Reply as one that it sent to itself by matching the Sender Handle=
 in the message with an LSP Ping Session ID.
<u></u><u></u></span></i></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; font-family: Calibri=
, sans-serif; color: rgb(31, 73, 125);"><u></u>&nbsp;<u></u></span></p>
</div>
<div>
<p style=3D"margin-left:41.25pt"><u></u><span>3.<span style=3D"font-style: =
normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-hei=
ght: normal; font-family: 'Times New Roman';">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span><u></u>What happens if there is LSP breakage or something and=
 the Echo request ends up on transit LSR? Doesn't it process?
<span style=3D"color:rgb(31,73,125)"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size: 11pt; font-family: C=
alibri, sans-serif; color: rgb(31, 73, 125);">[RPB] The transit LSR forward=
s the Echo Reply back to the ingress. The ingress declares the LSP to be re=
ady to carry traffic, even though it
 is broken. That=92s why my original message says, </span></i></b><b><i><sp=
an style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(3=
1, 78, 121);">=93</span></i></b><span style=3D"font-size: 11pt; font-family=
: Calibri, sans-serif; color: rgb(31, 78, 121);">Self
 Ping is designed to verify LSP readiness without consuming control plane r=
esources on the egress router. It is not designed to diagnose programming e=
rrors in which an LSR other than the egress de-encapsulates and forwards th=
e packet. Mechanisms that diagnose
 such issues are available [RFC 4950]. However, they are more resource inte=
nsive.=94<u></u><u></u></span></p>
<span class=3D"">
<p class=3D"MsoNormal"><b><i><span style=3D"font-size: 11pt; font-family: C=
alibri, sans-serif; color: rgb(31, 73, 125);"><u></u>&nbsp;<u></u></span></=
i></b></p>
<p class=3D"MsoNormal">I see that draft says, this will avoid control plane=
 processing. How so?<span style=3D"color:rgb(31,73,125)"><u></u><u></u></sp=
an></p>
</span>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size: 11pt; font-family: C=
alibri, sans-serif; color: rgb(31, 73, 125);">[RPB] The draft says that it =
avoids control plane processing on the egress router. The egress router nev=
er looks beyond the IP header. It simply
 forwards based upon IP destination.<u></u><u></u></span></i></b></p>
<span class=3D"">
<p class=3D"MsoNormal"><b><i><span style=3D"font-size: 11pt; font-family: C=
alibri, sans-serif; color: rgb(31, 73, 125);"><u></u>&nbsp;<u></u></span></=
i></b></p>
<p class=3D"MsoNormal">The packet is forwarded from ingress to egress, whic=
h means, the egress will have to process the packet i.e. look up the ip add=
ress to send it back to ingress.<u></u><u></u></p>
</span>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size: 11pt; font-family: C=
alibri, sans-serif; color: rgb(31, 73, 125);">[RPB] Yes. This happens on th=
e forwarding plane.</span></i></b></p>
</div>
</div>
</div>
</div>
</blockquote>
<div>%sam - Could be or could punt to RP if the forwarding entry is not on =
the LC.&nbsp;</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex">
<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div>
<div style=3D"border-style:none none none solid;border-left-color:blue;bord=
er-left-width:1.5pt;padding:0in 0in 0in 4pt">
<div>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; font-family: Calibri=
, sans-serif; color: rgb(31, 73, 125);"><u></u><u></u></span></p>
</div>
<span class=3D"">
<div>
<p class=3D"MsoNormal"><u></u>&nbsp;<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Draft says &quot;<span style=3D"font-size:10pt">The =
egress LSR forwards the MPLS Echo message to its destination, the</span><u>=
</u><u></u></p>
</div>
<pre style=3D"line-height:14.4pt">&nbsp;&nbsp; ingress LSR.&nbsp; The egres=
s LSR forwards the MPLS Echo message exactly<u></u><u></u></pre>
<pre style=3D"line-height:14.4pt">&nbsp;&nbsp; as it would forward any othe=
r packet.&quot;<u></u><u></u></pre>
<pre style=3D"line-height:14.4pt"><u></u>&nbsp;<u></u></pre>
<pre style=3D"line-height:14.4pt">Could you explain, how egress forwards th=
e packet back to ingress w/o looking up the packet IP header i.e. in the da=
ta plane and no additional control plane of OAM process?<span style=3D"colo=
r:rgb(31,73,125)"><u></u><u></u></span></pre>
<pre style=3D"line-height:14.4pt"><span style=3D"font-size: 11pt; font-fami=
ly: Calibri, sans-serif; color: rgb(31, 73, 125);"><u></u>&nbsp;<u></u></sp=
an></pre>
</span>
<div>
<p style=3D"margin-left:41.25pt"><u></u><span>4.<span style=3D"font-style: =
normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-hei=
ght: normal; font-family: 'Times New Roman';">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span><u></u>Is the assertion that, if Echo Reply is received back =
at the ingress then it is failure, rather it should receive Echo Request ba=
ck at Ingress, correct?<span style=3D"color:rgb(31,73,125)"><u></u><u></u><=
/span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size: 11pt; font-family: C=
alibri, sans-serif; color: rgb(31, 73, 125);">[RPB] Exactly the opposite! I=
f the Echo reply is received at the ingress, that is success</span></i></b>=
</p>
</div>
</div>
</div>
</div>
</blockquote>
<div>%sam - In the above answer, the echo reply could also be looped back f=
rom a transit, not necessarily egress. How you define success in that case?=
</div>
<div><br>
</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex">
<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div>
<div style=3D"border-style:none none none solid;border-left-color:blue;bord=
er-left-width:1.5pt;padding:0in 0in 0in 4pt">
<div>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size: 11pt; font-family: C=
alibri, sans-serif; color: rgb(31, 73, 125);"><u></u><u></u></span></i></b>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; font-family: Calibri=
, sans-serif; color: rgb(31, 73, 125);"><u></u>&nbsp;<u></u></span></p>
</div>
<div>
<p style=3D"margin-left:41.25pt"><u></u><span>5.<span style=3D"font-style: =
normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-hei=
ght: normal; font-family: 'Times New Roman';">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span><u></u>Why can't you use LSP proxy ping to self via Egress?<s=
pan style=3D"color:rgb(31,73,125)"><u></u><u></u></span></p>
<pre style=3D"line-height:14.4pt"><b><i><span style=3D"font-size: 11pt; fon=
t-family: Calibri, sans-serif; color: rgb(31, 73, 125);">[RPB] The procedur=
es described in Section 3.2.1 of </span></i></b><span style=3D"color:black"=
>draft-ietf-mpls-proxy-lsp-ping consume control plane resources on the egre=
ss LSR.</span></pre>
</div>
</div>
</div>
</div>
</blockquote>
<div>%sam - Have you done any quantitative study with existing LSP ping (w/=
o FEC validation) or BFD? Trying to understand how much improvement this ne=
w mechanism is bringing.</div>
<div><br>
</div>
<div>%sam - In addition, what if the egress lsr for the lsp is not in the s=
ame domain and may not have routable address? In otherwords, Echo reply is =
not received and timesout, but the RESV message is already received back at=
 ingress.&nbsp;</div>
<div><br>
</div>
<div>cheers</div>
<div>-sam</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex">
<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div>
<div style=3D"border-style:none none none solid;border-left-color:blue;bord=
er-left-width:1.5pt;padding:0in 0in 0in 4pt">
<div>
<pre style=3D"line-height:14.4pt"><span style=3D"color:black"><u></u><u></u=
></span></pre>
<pre style=3D"line-height:14.4pt"><span style=3D"color:black"><u></u>&nbsp;=
<u></u></span></pre>
<pre style=3D"line-height:14.4pt"><span style=3D"color:black">&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp; ROn<u></u><u></u></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; font-family: Calibri=
, sans-serif; color: rgb(31, 73, 125);"><u></u>&nbsp;<u></u></span></p>
</div>
<div>
<div class=3D"h5">
<div>
<p class=3D"MsoNormal"><u></u>&nbsp;<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Will followup with additional questions, if any, bas=
ed on your responses.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>&nbsp;<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">cheers<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">-sam<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>&nbsp;<u></u></p>
<div>
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
<div>
<p class=3D"MsoNormal">On Nov 19, 2014, at 8:38 AM, Ronald Bonica &lt;<a hr=
ef=3D"mailto:rbonica@juniper.net" target=3D"_blank">rbonica@juniper.net</a>=
&gt; wrote:<u></u><u></u></p>
</div>
<p class=3D"MsoNormal"><u></u>&nbsp;<u></u></p>
<div>
<p class=3D"MsoNormal">Folks<br>
<br>
At IETF 91, the following points were raised with regard to draft-bonica-mp=
ls-self-ping:<br>
<br>
1) Why not use BFD?<br>
2) Self-ping does not diagnose FIB programming errors in which an LSR other=
 than the egress de-encapsulates and forwards the packet.<br>
3) How does Self ping verify a bidirectional LSP's readiness to carry traff=
ic in both directions?<br>
4) Why does MPLS Self ping use MPLS Echo packets, as opposed to ICMP echo p=
ackets or some other packet format?<br>
<br>
Responses follow:<br>
<br>
1) Why not use BFD?<br>
<br>
Self Ping is an extremely light-weight protocol. A typical Self Ping sessio=
n emits one or two packets and terminates less than one second after initia=
tion. Self-ping requires no configuration or control plane resources on the=
 egress LSR.
<br>
<br>
By contrast, BFD is designed to verify bi-directional connectivity over a l=
onger period of time. Therefore, MPLS Self Ping is appropriate in environme=
nts where BFD is too resource intensive.<br>
<br>
2) Self-ping does not diagnose programming errors in which an LSR other tha=
n the egress de-encapsulates and forwards the packet.<br>
<br>
Self Ping is designed to verify LSP readiness without consuming control pla=
ne resources on the egress router. It is not designed to diagnose programmi=
ng errors in which an LSR other than the egress de-encapsulates and forward=
s the packet. Mechanisms that diagnose
 such issues are available [RFC 4950]. However, they are more resource inte=
nsive.<br>
<br>
3) How does Self ping verify a bidirectional LSP's readiness to carry traff=
ic in both directions?<br>
<br>
In order to verify bidirectional LSP readiness, RSVP instantiates two LSP S=
elf Ping sessions, one at each end of the LSP. The LSR at one end of the LS=
P initiates a self ping session when it receives a RESV message. The LSR at=
 the other end of the LSP initiates
 a Self Ping Session when it sends a RESV message. Each LSP endpoint forwar=
ds traffic over the LSP only after the LSP Self Ping session terminates suc=
cessfully<br>
<br>
4) Why does LSP Self Ping use MPLS Echo packets, as opposed to some other p=
acket format?<br>
<br>
LSP Self Ping could have used many packet formats. The only hard requiremen=
t was to have one 64-bit field in which the 64 bit session identifier could=
 be encoded. The MPLS Echo packet was convenient because its Senders Handle=
 is 64-bits long.
<br>
<br>
I will update the draft to reflect this information.<br>
<br>
Ron Bonica<br>
<br>
_______________________________________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" target=3D"_blank">ht=
tps://www.ietf.org/mailman/listinfo/mpls</a><u></u><u></u></p>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><u></u>&nbsp;<u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<br>
</div>
</div>
</div>
</div>
</span>
</body>
</html>

--_000_D09951A671955cpignataciscocom_--


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Changed milestone "Submit draft-ietf-mpls-smp-requirements for
publication", resolved as "Done".

URL: http://datatracker.ietf.org/wg/mpls/charter/


From nobody Mon Nov 24 20:56:04 2014
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Spencer Dawkins has entered the following ballot position for
charter-ietf-mpls-06-04: No Objection

When responding, please keep the subject line intact and reply to all
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The document, along with other ballot positions, can be found here:
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

I'm as confused as Pete is in his Block, but if you work things out with
Pete, I'm almost certainly good.



From nobody Mon Nov 24 22:24:36 2014
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From: "Dongjie (Jimmy)" <jie.dong@huawei.com>
To: Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] poll to see if we have consensus to adopt draft-akiya-mpls-entropy-lsp-ping
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Yes/Support. The document provides useful mechanism for exercising ECMP pat=
hs.

Best regards,
Jie

> -----Original Message-----
> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson
> Sent: Sunday, November 23, 2014 1:09 PM
> To: mpls@ietf.org
> Cc: mpls-chairs@tools.ietf.org;
> draft-akiya-mpls-entropy-lsp-ping@tools.ietf.org
> Subject: [mpls] poll to see if we have consensus to adopt
> draft-akiya-mpls-entropy-lsp-ping
>=20
> Working Group,
>=20
> This is to start a two week poll on adopting
> draft-akiya-mpls-entropy-lsp-ping-04 as an MPLS working group document.
>=20
> A bit if background, we had this document almost ready to go to the worki=
ng
> group adoption poll, but a discussion between authors and chairs converge=
d on
> that it would be beneficial to have to new IANA registries set up. Since =
those
> registries would include code points defined in other documents we could =
not
> define the registries in the current document. We now have
> draft-ietf-mpls-lsp-ping-registry adopted as a working group document, an=
d can
> now progress draft-akiya-mpls-entropy- lsp-ping.
>=20
> Please send your comments (support/not support) to the mpls working group
> mailing list (mpls@ietf.org). Please give a technical motivation for your
> support/not support, especially if you think that the document should not=
 be
> adopted as a working group document.
>=20
> There is two IPR disclosures directly against this document.
>=20
> The authors has all stated on the working group mailing list that they ar=
e
> unaware of any other IPR claims against this draft than the two disclosed=
.
>=20
> However if you are on the the mpls working group mailing list and aware o=
f IPR
> that relates to this draft, the time to disclose this is now.
>=20
> This poll ends December 8, 2014.
>=20
> /Loa
> --
>=20
>=20
> Loa Andersson                        email: loa@mail01.huawei.com
> Senior MPLS Expert                          loa@pi.nu
> Huawei Technologies (consultant)     phone: +46 739 81 21 64
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls


From nobody Tue Nov 25 00:02:08 2014
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To: Loa Andersson <loa@pi.nu>
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Cc: "mpls@ietf.org" <mpls@ietf.org>, "mpls-chairs@tools.ietf.org" <mpls-chairs@tools.ietf.org>, "draft-akiya-mpls-entropy-lsp-ping@tools.ietf.org" <draft-akiya-mpls-entropy-lsp-ping@tools.ietf.org>
Subject: Re: [mpls] poll to see if we have consensus to adopt draft-akiya-mpls-entropy-lsp-ping
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Yes/Support.


-Venkat.

On Sat, Nov 22, 2014 at 9:09 PM, Loa Andersson <loa@pi.nu> wrote:

> Working Group,
>
> This is to start a two week poll on adopting
> draft-akiya-mpls-entropy-lsp-ping-04 as an MPLS working group document.
>
> A bit if background, we had this document almost ready to go to the
> working group adoption poll, but a discussion between authors and chairs
> converged on that it would be beneficial to have to new IANA registries
> set up. Since those registries would include code points defined in
> other documents we could not define the registries in the current
> document. We now have draft-ietf-mpls-lsp-ping-registry adopted as a
> working group document, and can now progress draft-akiya-mpls-entropy-
> lsp-ping.
>
> Please send your comments (support/not support) to the mpls working
> group mailing list (mpls@ietf.org). Please give a technical
> motivation for your support/not support, especially if you think that
> the document should not be adopted as a working group document.
>
> There is two IPR disclosures directly against this document.
>
> The authors has all stated on the working group mailing
> list that they are unaware of any other IPR claims against this draft
> than the two disclosed.
>
> However if you are on the the mpls working group mailing list and
> aware of IPR that relates to this draft, the time to disclose
> this is now.
>
> This poll ends December 8, 2014.
>
> /Loa
> --
>
>
> Loa Andersson                        email: loa@mail01.huawei.com
> Senior MPLS Expert                          loa@pi.nu
> Huawei Technologies (consultant)     phone: +46 739 81 21 64
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

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<div dir=3D"ltr">Yes/Support.<div><br></div><div><br></div><div>-Venkat.</d=
iv></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Sat, =
Nov 22, 2014 at 9:09 PM, Loa Andersson <span dir=3D"ltr">&lt;<a href=3D"mai=
lto:loa@pi.nu" target=3D"_blank">loa@pi.nu</a>&gt;</span> wrote:<br><blockq=
uote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc =
solid;padding-left:1ex">Working Group,<br>
<br>
This is to start a two week poll on adopting<br>
draft-akiya-mpls-entropy-lsp-<u></u>ping-04 as an MPLS working group docume=
nt.<br>
<br>
A bit if background, we had this document almost ready to go to the<br>
working group adoption poll, but a discussion between authors and chairs<br=
>
converged on that it would be beneficial to have to new IANA registries<br>
set up. Since those registries would include code points defined in<br>
other documents we could not define the registries in the current<br>
document. We now have draft-ietf-mpls-lsp-ping-<u></u>registry adopted as a=
<br>
working group document, and can now progress draft-akiya-mpls-entropy-<br>
lsp-ping.<br>
<br>
Please send your comments (support/not support) to the mpls working<br>
group mailing list (<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls=
@ietf.org</a>). Please give a technical<br>
motivation for your support/not support, especially if you think that<br>
the document should not be adopted as a working group document.<br>
<br>
There is two IPR disclosures directly against this document.<br>
<br>
The authors has all stated on the working group mailing<br>
list that they are unaware of any other IPR claims against this draft<br>
than the two disclosed.<br>
<br>
However if you are on the the mpls working group mailing list and<br>
aware of IPR that relates to this draft, the time to disclose<br>
this is now.<br>
<br>
This poll ends December 8, 2014.<span class=3D"HOEnZb"><font color=3D"#8888=
88"><br>
<br>
/Loa<br>
-- <br>
<br>
<br>
Loa Andersson=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 email: <a href=3D"mailto:loa@mail01.huawei.com" targe=
t=3D"_blank">loa@mail01.huawei.com</a><br>
Senior MPLS Expert=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"mailto:loa@pi.nu" target=3D"_=
blank">loa@pi.nu</a><br>
Huawei Technologies (consultant)=C2=A0 =C2=A0 =C2=A0phone: <a href=3D"tel:%=
2B46%20739%2081%2021%2064" value=3D"+46739812164" target=3D"_blank">+46 739=
 81 21 64</a><br>
<br>
______________________________<u></u>_________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" target=3D"_blank">ht=
tps://www.ietf.org/mailman/<u></u>listinfo/mpls</a><br>
</font></span></blockquote></div><br></div>

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From: Sam Aldrin <aldrin.ietf@gmail.com>
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Date: Tue, 25 Nov 2014 00:41:23 -0800
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References: <26a36728057a4bc0b74d3df286a7f470@CO1PR05MB442.namprd05.prod.outlook.com> <84B8D01E-82B3-40B7-B229-D3201D640AF5@gmail.com> <6cd92238dc4442a283b9ba92bd299e59@CO1PR05MB442.namprd05.prod.outlook.com> <CA+C0YO05JU9vhp5Vxsxfb9wWKNZMJyGcDKQ0yL+mMBbVqJPU5A@mail.gmail.com> <D09951A6.71955%cpignata@cisco.com>
To: Carlos Pignataro <cpignata@cisco.com>
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Cc: Ronald Bonica <rbonica@juniper.net>, "mpls@ietf.org" <mpls@ietf.org>
Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Hi Carlos,

Comments inline.
> On Nov 24, 2014, at 6:42 PM, Carlos Pignataro (cpignata) =
<cpignata@cisco.com> wrote:
>=20
> Hi, Ron, Sam,
>=20
> Joining the discussion late. I did want to point out a couple of =
additional considerations, I believe these have not been mentioned yet, =
apologies if they have:
> If the packet is an MPLS Echo Request, from S4.3 of RFC4379, =93The =
Router Alert option MUST be set in the IP header.=94 In that case, the =
egress will do some processing, punt to a slower path, examine more =
closely, follow RFC4379=92s procedures, might not like the pak.
Yes, this is what I was eluding to when I sent my first email. But after =
re-reading and Ron's reply, MPLS Echo request format type packet is =
never sent. Instead  always an MPLS Echo Reply format type packet, which =
gets sent, which means, IP options are not set

Rest of the comments were mentioned in other emails as well.

-sam
> If the packet is an MPLS Echo Reply, it cannot be sent, because from =
S4.5 of RFC4379 =93It MUST ONLY be sent in response to an MPLS echo =
request.=94
> In both #1 and #2, there are some potential issues with following the =
RFC4379 processing. However,
> There is nothing preventing you from defining a new Message Type of =
=93MPLS echo self-ping=94 in some friendly range, and specifying the =
procedures. The caveats of not detecting an LSP broken mid-way that puts =
the IP packet on the data plane and others still apply to this (unless =
there is some control plane processing on the LSP egress, which defeats =
the purpose.
> Thanks,
>=20
> Carlos.
>=20
> From: Sam Aldrin <aldrin.ietf@gmail.com =
<mailto:aldrin.ietf@gmail.com>>
> Date: Monday, November 24, 2014 at 6:28 PM
> To: Ronald Bonica <rbonica@juniper.net <mailto:rbonica@juniper.net>>
> Cc: "mpls@ietf.org <mailto:mpls@ietf.org>" <mpls@ietf.org =
<mailto:mpls@ietf.org>>
> Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments =
from the mike
>=20
> Hi Ron,
>=20
> Thanks for the comments.
> Please find my comments inline.
>=20
> On Fri, Nov 21, 2014 at 1:44 PM, Ronald Bonica <rbonica@juniper.net =
<mailto:rbonica@juniper.net>> wrote:
>> Hi Sam,
>> =20
>> Response inline=85=85
>> =20
>> From: Sam Aldrin [mailto:aldrin.ietf@gmail.com =
<mailto:aldrin.ietf@gmail.com>]=20
>> Sent: Wednesday, November 19, 2014 10:28 PM
>> To: Ronald Bonica
>> Cc: mpls@ietf.org <mailto:mpls@ietf.org>
>> Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments =
from the mike
>> =20
>> Hi Ron,
>> =20
>> Still trying to understand the need for the draft, hence, have few of =
questions and need clarifications. Appreciate your response in advance.
>> =20
>> 1.      (clarification q) The Ingress LSR sends the Echo request, =
with destination IP address to self, and forwards to Egress LSR (sec 2), =
correct?
>> [RPB]  Almost. The Ingress LSR sends the Echo *Reply*, with =
destination IP address to self, and forwards to Egress LSR.
> %sam - Ah uh! Now I know why it(draft) is confusing. While when I read =
your response, it says 'Echo Reply', where as draft-bonica says, 'MPLS =
Echo Message'. =20
> I believe you are actually forming 'MPLS Echo Reply' and NOT 'MPLS =
Echo Request'.
> In sec 2.=20
> o Format a MPLS Echo [RFC4379] message
> o  Send the MPLS Echo message through the LSP under test.
>=20
> This is what is confusing. As you are referring to RFC4379, either use =
MPLS Echo Request/Reply, to avoid confusion.
> I understand you are just using the packet format, but there is no =
definition of MPLS Echo message.
>> =20
>> 2.        Is this the only thing which identifies the Ingress LSR or =
something else too?
>> [RPB] The egress LSR doesn=92t need to identify the ingress LSR. It =
just forwards an IP packet based upon IP destination. The Ingress LSR =
identifies the Echo Reply as one that it sent to itself by matching the =
Sender Handle in the message with an LSP Ping Session ID.
>> =20
>> 3.      What happens if there is LSP breakage or something and the =
Echo request ends up on transit LSR? Doesn't it process?
>>=20
>> [RPB] The transit LSR forwards the Echo Reply back to the ingress. =
The ingress declares the LSP to be ready to carry traffic, even though =
it is broken. That=92s why my original message says, =93Self Ping is =
designed to verify LSP readiness without consuming control plane =
resources on the egress router. It is not designed to diagnose =
programming errors in which an LSR other than the egress de-encapsulates =
and forwards the packet. Mechanisms that diagnose such issues are =
available [RFC 4950]. However, they are more resource intensive.=94
>> =20
>> I see that draft says, this will avoid control plane processing. How =
so?
>> [RPB] The draft says that it avoids control plane processing on the =
egress router. The egress router never looks beyond the IP header. It =
simply forwards based upon IP destination.
>> =20
>> The packet is forwarded from ingress to egress, which means, the =
egress will have to process the packet i.e. look up the ip address to =
send it back to ingress.
>> [RPB] Yes. This happens on the forwarding plane.
> %sam - Could be or could punt to RP if the forwarding entry is not on =
the LC.=20
>> =20
>> Draft says "The egress LSR forwards the MPLS Echo message to its =
destination, the
>>    ingress LSR.  The egress LSR forwards the MPLS Echo message =
exactly
>>    as it would forward any other packet."
>> =20
>> Could you explain, how egress forwards the packet back to ingress w/o =
looking up the packet IP header i.e. in the data plane and no additional =
control plane of OAM process?
>> =20
>> 4.      Is the assertion that, if Echo Reply is received back at the =
ingress then it is failure, rather it should receive Echo Request back =
at Ingress, correct?
>>=20
>> [RPB] Exactly the opposite! If the Echo reply is received at the =
ingress, that is success
> %sam - In the above answer, the echo reply could also be looped back =
from a transit, not necessarily egress. How you define success in that =
case?
>=20
>> =20
>> 5.      Why can't you use LSP proxy ping to self via Egress?
>>=20
>> [RPB] The procedures described in Section 3.2.1 of =
draft-ietf-mpls-proxy-lsp-ping consume control plane resources on the =
egress LSR.
> %sam - Have you done any quantitative study with existing LSP ping =
(w/o FEC validation) or BFD? Trying to understand how much improvement =
this new mechanism is bringing.
>=20
> %sam - In addition, what if the egress lsr for the lsp is not in the =
same domain and may not have routable address? In otherwords, Echo reply =
is not received and timesout, but the RESV message is already received =
back at ingress.=20
>=20
> cheers
> -sam
>> =20
>>                                 ROn
>> =20
>> =20
>> Will followup with additional questions, if any, based on your =
responses.
>> =20
>> cheers
>> -sam
>> =20
>>> On Nov 19, 2014, at 8:38 AM, Ronald Bonica <rbonica@juniper.net =
<mailto:rbonica@juniper.net>> wrote:
>>> =20
>>> Folks
>>>=20
>>> At IETF 91, the following points were raised with regard to =
draft-bonica-mpls-self-ping:
>>>=20
>>> 1) Why not use BFD?
>>> 2) Self-ping does not diagnose FIB programming errors in which an =
LSR other than the egress de-encapsulates and forwards the packet.
>>> 3) How does Self ping verify a bidirectional LSP's readiness to =
carry traffic in both directions?
>>> 4) Why does MPLS Self ping use MPLS Echo packets, as opposed to ICMP =
echo packets or some other packet format?
>>>=20
>>> Responses follow:
>>>=20
>>> 1) Why not use BFD?
>>>=20
>>> Self Ping is an extremely light-weight protocol. A typical Self Ping =
session emits one or two packets and terminates less than one second =
after initiation. Self-ping requires no configuration or control plane =
resources on the egress LSR.=20
>>>=20
>>> By contrast, BFD is designed to verify bi-directional connectivity =
over a longer period of time. Therefore, MPLS Self Ping is appropriate =
in environments where BFD is too resource intensive.
>>>=20
>>> 2) Self-ping does not diagnose programming errors in which an LSR =
other than the egress de-encapsulates and forwards the packet.
>>>=20
>>> Self Ping is designed to verify LSP readiness without consuming =
control plane resources on the egress router. It is not designed to =
diagnose programming errors in which an LSR other than the egress =
de-encapsulates and forwards the packet. Mechanisms that diagnose such =
issues are available [RFC 4950]. However, they are more resource =
intensive.
>>>=20
>>> 3) How does Self ping verify a bidirectional LSP's readiness to =
carry traffic in both directions?
>>>=20
>>> In order to verify bidirectional LSP readiness, RSVP instantiates =
two LSP Self Ping sessions, one at each end of the LSP. The LSR at one =
end of the LSP initiates a self ping session when it receives a RESV =
message. The LSR at the other end of the LSP initiates a Self Ping =
Session when it sends a RESV message. Each LSP endpoint forwards traffic =
over the LSP only after the LSP Self Ping session terminates =
successfully
>>>=20
>>> 4) Why does LSP Self Ping use MPLS Echo packets, as opposed to some =
other packet format?
>>>=20
>>> LSP Self Ping could have used many packet formats. The only hard =
requirement was to have one 64-bit field in which the 64 bit session =
identifier could be encoded. The MPLS Echo packet was convenient because =
its Senders Handle is 64-bits long.=20
>>>=20
>>> I will update the draft to reflect this information.
>>>=20
>>> Ron Bonica
>>>=20
>>> _______________________________________________
>>> mpls mailing list
>>> mpls@ietf.org <mailto:mpls@ietf.org>
>>> https://www.ietf.org/mailman/listinfo/mpls =
<https://www.ietf.org/mailman/listinfo/mpls>
>> =20
>=20


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charset=3Dwindows-1252"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Hi Carlos,<div class=3D""><br class=3D""></div><div =
class=3D"">Comments inline.<br class=3D""><div><blockquote type=3D"cite" =
class=3D""><div class=3D"">On Nov 24, 2014, at 6:42 PM, Carlos Pignataro =
(cpignata) &lt;<a href=3D"mailto:cpignata@cisco.com" =
class=3D"">cpignata@cisco.com</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D"">

<meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3DWindows-1252" class=3D"">

<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space; font-size: 14px; font-family: =
Calibri, sans-serif;" class=3D"">
<div class=3D"">Hi, Ron, Sam,</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Joining the discussion late. I did want to point out a =
couple of additional considerations, I believe these have not been =
mentioned yet, apologies if they have:</div>
<ol class=3D"">
<li class=3D"">If the packet is an MPLS Echo Request, from S4.3 of =
RFC4379, =93The Router Alert option MUST be set in the IP header.=94 In =
that case, the egress will do some processing, punt to a slower path, =
examine more closely, follow RFC4379=92s procedures, might not like
 the pak.</li></ol></div></div></blockquote>Yes, this is what I was =
eluding to when I sent my first email. But after re-reading and Ron's =
reply, MPLS Echo request format type packet is never sent. Instead =
&nbsp;always an MPLS Echo Reply format type packet, which gets sent, =
which means, IP options are not set</div><div><br =
class=3D""></div><div>Rest of the comments were mentioned in other =
emails as well.</div><div><br class=3D""></div><div>-sam<br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""><div =
style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space; font-size: 14px; font-family: =
Calibri, sans-serif;" class=3D""><ol class=3D"" start=3D"2"><li =
class=3D"">If the packet is an MPLS Echo Reply, it cannot be sent, =
because from S4.5 of RFC4379 =93It MUST ONLY be sent in response&nbsp;to =
an MPLS echo request.=94</li><li class=3D"">In both #1 and #2, there are =
some potential issues with following the RFC4379 processing. =
However,</li><li class=3D"">There is nothing preventing you from =
defining a new&nbsp;Message Type of =93MPLS echo self-ping=94 in some =
friendly range, and specifying the procedures. The caveats of not =
detecting an LSP broken mid-way that puts the IP packet on the data =
plane and others still
 apply to this (unless there is some control plane processing on the LSP =
egress, which defeats the purpose.</li></ol>
<div class=3D"">Thanks,</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Carlos.</div>
<div class=3D""><br class=3D"">
</div>
<span id=3D"OLK_SRC_BODY_SECTION" class=3D"">
<div style=3D"font-family: Calibri; font-size: 11pt; text-align: left; =
border-width: 1pt medium medium; border-style: solid none none; padding: =
3pt 0in 0in; border-top-color: rgb(181, 196, 223);" class=3D"">
<span style=3D"font-weight:bold" class=3D"">From: </span>Sam Aldrin =
&lt;<a href=3D"mailto:aldrin.ietf@gmail.com" =
class=3D"">aldrin.ietf@gmail.com</a>&gt;<br class=3D"">
<span style=3D"font-weight:bold" class=3D"">Date: </span>Monday, =
November 24, 2014 at 6:28 PM<br class=3D"">
<span style=3D"font-weight:bold" class=3D"">To: </span>Ronald Bonica =
&lt;<a href=3D"mailto:rbonica@juniper.net" =
class=3D"">rbonica@juniper.net</a>&gt;<br class=3D"">
<span style=3D"font-weight:bold" class=3D"">Cc: </span>"<a =
href=3D"mailto:mpls@ietf.org" class=3D"">mpls@ietf.org</a>" &lt;<a =
href=3D"mailto:mpls@ietf.org" class=3D"">mpls@ietf.org</a>&gt;<br =
class=3D"">
<span style=3D"font-weight:bold" class=3D"">Subject: </span>Re: [mpls] =
draft-bonica-mpls-self-ping: Response to comments from the mike<br =
class=3D"">
</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">
<div class=3D"">
<div dir=3D"ltr" class=3D"">Hi Ron,
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Thanks for the comments.</div>
<div class=3D"">Please find my comments inline.</div>
<div class=3D"gmail_extra"><br class=3D"">
<div class=3D"gmail_quote">On Fri, Nov 21, 2014 at 1:44 PM, Ronald =
Bonica <span dir=3D"ltr" class=3D"">
&lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"_blank" =
class=3D"">rbonica@juniper.net</a>&gt;</span> wrote:<br class=3D"">
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left=
-style:solid;padding-left:1ex" type=3D"cite">
<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple" class=3D"">
<div class=3D""><div class=3D"MsoNormal"><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">Hi =
Sam,<u class=3D""></u><u class=3D""></u></span></div><div =
class=3D"MsoNormal"><span style=3D"font-size: 11pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D""><u =
class=3D""></u>&nbsp;<u class=3D""></u></span></div><div =
class=3D"MsoNormal"><span style=3D"font-size: 11pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">Response =
inline=85=85<u class=3D""></u><u class=3D""></u></span></div><div =
class=3D"MsoNormal"><span style=3D"font-size: 11pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D""><u =
class=3D""></u>&nbsp;<u class=3D""></u></span></div>
<div style=3D"border-style:none none none =
solid;border-left-color:blue;border-left-width:1.5pt;padding:0in 0in 0in =
4pt" class=3D"">
<div class=3D"">
<div style=3D"border-style:solid none =
none;border-top-color:rgb(225,225,225);border-top-width:1pt;padding:3pt =
0in 0in" class=3D""><div class=3D"MsoNormal"><b class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">From:</span></b><span style=3D"font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""> Sam Aldrin [mailto:<a =
href=3D"mailto:aldrin.ietf@gmail.com" target=3D"_blank" =
class=3D"">aldrin.ietf@gmail.com</a>]
<br class=3D"">
<b class=3D"">Sent:</b> Wednesday, November 19, 2014 10:28 PM<br =
class=3D"">
<b class=3D"">To:</b> Ronald Bonica<br class=3D"">
<b class=3D"">Cc:</b> <a href=3D"mailto:mpls@ietf.org" target=3D"_blank" =
class=3D"">mpls@ietf.org</a><span class=3D""><br class=3D"">
<b class=3D"">Subject:</b> Re: [mpls] draft-bonica-mpls-self-ping: =
Response to comments from the mike<u class=3D""></u><u =
class=3D""></u></span></span></div>
</div>
</div><div class=3D"MsoNormal"><u class=3D""></u>&nbsp;<u =
class=3D""></u></div><div class=3D"MsoNormal">Hi Ron,<u class=3D""></u><u =
class=3D""></u></div>
<span class=3D"">
<div class=3D""><div class=3D"MsoNormal"><u class=3D""></u>&nbsp;<u =
class=3D""></u></div>
</div>
<div class=3D""><div class=3D"MsoNormal">Still trying to understand the =
need for the draft, hence, have few of questions and need =
clarifications. Appreciate your response in advance.<u class=3D""></u><u =
class=3D""></u></div>
</div>
<div class=3D""><div class=3D"MsoNormal"><u class=3D""></u>&nbsp;<u =
class=3D""></u></div>
</div>
</span>
<div class=3D""><span class=3D""><div class=3D""><u class=3D""></u><span =
class=3D"">1.<span style=3D"font-style: normal; font-variant: normal; =
font-weight: normal; font-size: 7pt; line-height: normal; font-family: =
'Times New Roman';" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><u class=3D""></u>(clarification q) The Ingress LSR sends =
the Echo request, with destination IP address to self, and forwards to =
Egress LSR (sec 2), correct?<span style=3D"color:rgb(31,73,125)" =
class=3D""><u class=3D""></u><u class=3D""></u></span></div>
</span><div class=3D"MsoNormal"><b class=3D""><i class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">[RPB]
</span></i></b>&nbsp;Almost. The Ingress LSR sends the Echo *<b =
class=3D"">Reply</b>*, with destination IP address to self, and forwards =
to Egress LSR.</div>
</div>
</div>
</div>
</div>
</blockquote>
<div class=3D"">%sam - Ah uh! Now I know why it(draft) is confusing. =
<span style=3D"font-size: 13px; line-height: 1.2em;" class=3D"">
While when I read your response, it says 'Echo Reply', where as =
draft-bonica says, 'MPLS Echo Message'.&nbsp;</span>&nbsp;</div>
<div class=3D"">I believe you are actually forming 'MPLS Echo Reply' and =
NOT 'MPLS Echo Request'.</div>
<div class=3D"">In sec 2.&nbsp;</div>
<div class=3D""><span style=3D"font-size: 13px; line-height: 1.2em;" =
class=3D"">o Format a MPLS Echo [RFC4379] message</span></div>
<pre style=3D"line-height: 1.2em; margin-top: 0px; margin-bottom: 0px; =
font-size: 13px;" class=3D"">o  Send the MPLS Echo message through the =
LSP under test.</pre>
<pre style=3D"line-height: 1.2em; margin-top: 0px; margin-bottom: 0px; =
font-size: 13px;" class=3D""><br class=3D""></pre>
<pre style=3D"line-height: 1.2em; margin-top: 0px; margin-bottom: 0px; =
font-size: 13px;" class=3D"">This is what is confusing. As you are =
referring to RFC4379, either use MPLS Echo Request/Reply, to avoid =
confusion.</pre>
<pre style=3D"line-height: 1.2em; margin-top: 0px; margin-bottom: 0px; =
font-size: 13px;" class=3D"">I understand you are just using the packet =
format, but there is no definition of MPLS Echo message.</pre>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left=
-style:solid;padding-left:1ex" type=3D"cite">
<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple" class=3D"">
<div class=3D"">
<div style=3D"border-style:none none none =
solid;border-left-color:blue;border-left-width:1.5pt;padding:0in 0in 0in =
4pt" class=3D"">
<div class=3D""><div class=3D"MsoNormal"><u class=3D""></u><u =
class=3D""></u></div><div class=3D"MsoNormal"><u class=3D""></u>&nbsp;<u =
class=3D""></u></div><div class=3D""><u class=3D""></u><span =
class=3D"">2.<span style=3D"font-style: normal; font-variant: normal; =
font-weight: normal; font-size: 7pt; line-height: normal; font-family: =
'Times New Roman';" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><u class=3D""></u>&nbsp;&nbsp;Is this the only thing which =
identifies the Ingress LSR or something else too?<u class=3D""></u><u =
class=3D""></u></div><div class=3D"MsoNormal"><b class=3D""><i =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">[RPB] The egress LSR =
doesn=92t need to identify the ingress LSR. It just forwards an IP =
packet based upon IP destination. The Ingress LSR identifies
 the Echo Reply as one that it sent to itself by matching the Sender =
Handle in the message with an LSP Ping Session ID.
<u class=3D""></u><u class=3D""></u></span></i></b></div><div =
class=3D"MsoNormal"><span style=3D"font-size: 11pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D""><u =
class=3D""></u>&nbsp;<u class=3D""></u></span></div>
</div>
<div class=3D""><p style=3D"margin-left:41.25pt" class=3D""><u =
class=3D""></u><span class=3D"">3.<span style=3D"font-style: normal; =
font-variant: normal; font-weight: normal; font-size: 7pt; line-height: =
normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><u class=3D""></u>What happens if there is LSP breakage or =
something and the Echo request ends up on transit LSR? Doesn't it =
process?
<span style=3D"color:rgb(31,73,125)" class=3D""><u class=3D""></u><u =
class=3D""></u></span></p><div class=3D"MsoNormal"><b class=3D""><i =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">[RPB] The transit LSR =
forwards the Echo Reply back to the ingress. The ingress declares the =
LSP to be ready to carry traffic, even though it
 is broken. That=92s why my original message says, </span></i></b><b =
class=3D""><i class=3D""><span style=3D"font-size: 11pt; font-family: =
Calibri, sans-serif; color: rgb(31, 78, 121);" =
class=3D"">=93</span></i></b><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 78, 121);" =
class=3D"">Self
 Ping is designed to verify LSP readiness without consuming control =
plane resources on the egress router. It is not designed to diagnose =
programming errors in which an LSR other than the egress de-encapsulates =
and forwards the packet. Mechanisms that diagnose
 such issues are available [RFC 4950]. However, they are more resource =
intensive.=94<u class=3D""></u><u class=3D""></u></span></div>
<span class=3D""><div class=3D"MsoNormal"><b class=3D""><i =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><u =
class=3D""></u>&nbsp;<u class=3D""></u></span></i></b></div><div =
class=3D"MsoNormal">I see that draft says, this will avoid control plane =
processing. How so?<span style=3D"color:rgb(31,73,125)" class=3D""><u =
class=3D""></u><u class=3D""></u></span></div>
</span><div class=3D"MsoNormal"><b class=3D""><i class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">[RPB] The draft says that it avoids =
control plane processing on the egress router. The egress router never =
looks beyond the IP header. It simply
 forwards based upon IP destination.<u class=3D""></u><u =
class=3D""></u></span></i></b></div>
<span class=3D""><div class=3D"MsoNormal"><b class=3D""><i =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><u =
class=3D""></u>&nbsp;<u class=3D""></u></span></i></b></div><div =
class=3D"MsoNormal">The packet is forwarded from ingress to egress, =
which means, the egress will have to process the packet i.e. look up the =
ip address to send it back to ingress.<u class=3D""></u><u =
class=3D""></u></div>
</span><div class=3D"MsoNormal"><b class=3D""><i class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">[RPB] Yes. This happens on the forwarding =
plane.</span></i></b></div>
</div>
</div>
</div>
</div>
</blockquote>
<div class=3D"">%sam - Could be or could punt to RP if the forwarding =
entry is not on the LC.&nbsp;</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left=
-style:solid;padding-left:1ex" type=3D"cite">
<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple" class=3D"">
<div class=3D"">
<div style=3D"border-style:none none none =
solid;border-left-color:blue;border-left-width:1.5pt;padding:0in 0in 0in =
4pt" class=3D"">
<div class=3D""><div class=3D"MsoNormal"><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D""><u =
class=3D""></u><u class=3D""></u></span></div>
</div>
<span class=3D"">
<div class=3D""><div class=3D"MsoNormal"><u class=3D""></u>&nbsp;<u =
class=3D""></u></div>
</div>
<div class=3D""><div class=3D"MsoNormal">Draft says "<span =
style=3D"font-size:10pt" class=3D"">The egress LSR forwards the MPLS =
Echo message to its destination, the</span><u class=3D""></u><u =
class=3D""></u></div>
</div>
<pre style=3D"line-height:14.4pt" class=3D"">&nbsp;&nbsp; ingress =
LSR.&nbsp; The egress LSR forwards the MPLS Echo message exactly<u =
class=3D""></u><u class=3D""></u></pre>
<pre style=3D"line-height:14.4pt" class=3D"">&nbsp;&nbsp; as it would =
forward any other packet."<u class=3D""></u><u class=3D""></u></pre>
<pre style=3D"line-height:14.4pt" class=3D""><u class=3D""></u>&nbsp;<u =
class=3D""></u></pre>
<pre style=3D"line-height:14.4pt" class=3D"">Could you explain, how =
egress forwards the packet back to ingress w/o looking up the packet IP =
header i.e. in the data plane and no additional control plane of OAM =
process?<span style=3D"color:rgb(31,73,125)" class=3D""><u =
class=3D""></u><u class=3D""></u></span></pre>
<pre style=3D"line-height:14.4pt" class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><u class=3D""></u>&nbsp;<u class=3D""></u></span></pre>
</span>
<div class=3D""><p style=3D"margin-left:41.25pt" class=3D""><u =
class=3D""></u><span class=3D"">4.<span style=3D"font-style: normal; =
font-variant: normal; font-weight: normal; font-size: 7pt; line-height: =
normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><u class=3D""></u>Is the assertion that, if Echo Reply is =
received back at the ingress then it is failure, rather it should =
receive Echo Request back at Ingress, correct?<span =
style=3D"color:rgb(31,73,125)" class=3D""><u class=3D""></u><u =
class=3D""></u></span></p><div class=3D"MsoNormal"><b class=3D""><i =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">[RPB] Exactly the =
opposite! If the Echo reply is received at the ingress, that is =
success</span></i></b></div>
</div>
</div>
</div>
</div>
</blockquote>
<div class=3D"">%sam - In the above answer, the echo reply could also be =
looped back from a transit, not necessarily egress. How you define =
success in that case?</div>
<div class=3D""><br class=3D"">
</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left=
-style:solid;padding-left:1ex" type=3D"cite">
<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple" class=3D"">
<div class=3D"">
<div style=3D"border-style:none none none =
solid;border-left-color:blue;border-left-width:1.5pt;padding:0in 0in 0in =
4pt" class=3D"">
<div class=3D""><div class=3D"MsoNormal"><b class=3D""><i class=3D""><span=
 style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D""><u class=3D""></u><u =
class=3D""></u></span></i></b></div><div class=3D"MsoNormal"><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D""><u class=3D""></u>&nbsp;<u =
class=3D""></u></span></div>
</div>
<div class=3D""><p style=3D"margin-left:41.25pt" class=3D""><u =
class=3D""></u><span class=3D"">5.<span style=3D"font-style: normal; =
font-variant: normal; font-weight: normal; font-size: 7pt; line-height: =
normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><u class=3D""></u>Why can't you use LSP proxy ping to self =
via Egress?<span style=3D"color:rgb(31,73,125)" class=3D""><u =
class=3D""></u><u class=3D""></u></span></p>
<pre style=3D"line-height:14.4pt" class=3D""><b class=3D""><i =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">[RPB] The procedures =
described in Section 3.2.1 of </span></i></b><span style=3D"" =
class=3D"">draft-ietf-mpls-proxy-lsp-ping consume control plane =
resources on the egress LSR.</span></pre>
</div>
</div>
</div>
</div>
</blockquote>
<div class=3D"">%sam - Have you done any quantitative study with =
existing LSP ping (w/o FEC validation) or BFD? Trying to understand how =
much improvement this new mechanism is bringing.</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">%sam - In addition, what if the egress lsr for the lsp =
is not in the same domain and may not have routable address? In =
otherwords, Echo reply is not received and timesout, but the RESV =
message is already received back at ingress.&nbsp;</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">cheers</div>
<div class=3D"">-sam</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left=
-style:solid;padding-left:1ex" type=3D"cite">
<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple" class=3D"">
<div class=3D"">
<div style=3D"border-style:none none none =
solid;border-left-color:blue;border-left-width:1.5pt;padding:0in 0in 0in =
4pt" class=3D"">
<div class=3D"">
<pre style=3D"line-height:14.4pt" class=3D""><span style=3D"" =
class=3D""><u class=3D""></u><u class=3D""></u></span></pre>
<pre style=3D"line-height:14.4pt" class=3D""><span style=3D"" =
class=3D""><u class=3D""></u>&nbsp;<u class=3D""></u></span></pre>
<pre style=3D"line-height:14.4pt" class=3D""><span style=3D"" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ROn<u class=3D""></u><u =
class=3D""></u></span></pre><div class=3D"MsoNormal"><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D""><u class=3D""></u>&nbsp;<u =
class=3D""></u></span></div>
</div>
<div class=3D"">
<div class=3D"h5">
<div class=3D""><div class=3D"MsoNormal"><u class=3D""></u>&nbsp;<u =
class=3D""></u></div>
</div>
<div class=3D""><div class=3D"MsoNormal">Will followup with additional =
questions, if any, based on your responses.<u class=3D""></u><u =
class=3D""></u></div>
</div>
<div class=3D""><div class=3D"MsoNormal"><u class=3D""></u>&nbsp;<u =
class=3D""></u></div>
</div>
<div class=3D""><div class=3D"MsoNormal">cheers<u class=3D""></u><u =
class=3D""></u></div>
</div>
<div class=3D""><div class=3D"MsoNormal">-sam<u class=3D""></u><u =
class=3D""></u></div>
</div>
<div class=3D""><div class=3D"MsoNormal"><u class=3D""></u>&nbsp;<u =
class=3D""></u></div>
<div class=3D"">
<blockquote style=3D"margin-top:5pt;margin-bottom:5pt" class=3D"" =
type=3D"cite">
<div class=3D""><div class=3D"MsoNormal">On Nov 19, 2014, at 8:38 AM, =
Ronald Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"_blank"=
 class=3D"">rbonica@juniper.net</a>&gt; wrote:<u class=3D""></u><u =
class=3D""></u></div>
</div><div class=3D"MsoNormal"><u class=3D""></u>&nbsp;<u =
class=3D""></u></div>
<div class=3D""><div class=3D"MsoNormal">Folks<br class=3D"">
<br class=3D"">
At IETF 91, the following points were raised with regard to =
draft-bonica-mpls-self-ping:<br class=3D"">
<br class=3D"">
1) Why not use BFD?<br class=3D"">
2) Self-ping does not diagnose FIB programming errors in which an LSR =
other than the egress de-encapsulates and forwards the packet.<br =
class=3D"">
3) How does Self ping verify a bidirectional LSP's readiness to carry =
traffic in both directions?<br class=3D"">
4) Why does MPLS Self ping use MPLS Echo packets, as opposed to ICMP =
echo packets or some other packet format?<br class=3D"">
<br class=3D"">
Responses follow:<br class=3D"">
<br class=3D"">
1) Why not use BFD?<br class=3D"">
<br class=3D"">
Self Ping is an extremely light-weight protocol. A typical Self Ping =
session emits one or two packets and terminates less than one second =
after initiation. Self-ping requires no configuration or control plane =
resources on the egress LSR.
<br class=3D"">
<br class=3D"">
By contrast, BFD is designed to verify bi-directional connectivity over =
a longer period of time. Therefore, MPLS Self Ping is appropriate in =
environments where BFD is too resource intensive.<br class=3D"">
<br class=3D"">
2) Self-ping does not diagnose programming errors in which an LSR other =
than the egress de-encapsulates and forwards the packet.<br class=3D"">
<br class=3D"">
Self Ping is designed to verify LSP readiness without consuming control =
plane resources on the egress router. It is not designed to diagnose =
programming errors in which an LSR other than the egress de-encapsulates =
and forwards the packet. Mechanisms that diagnose
 such issues are available [RFC 4950]. However, they are more resource =
intensive.<br class=3D"">
<br class=3D"">
3) How does Self ping verify a bidirectional LSP's readiness to carry =
traffic in both directions?<br class=3D"">
<br class=3D"">
In order to verify bidirectional LSP readiness, RSVP instantiates two =
LSP Self Ping sessions, one at each end of the LSP. The LSR at one end =
of the LSP initiates a self ping session when it receives a RESV =
message. The LSR at the other end of the LSP initiates
 a Self Ping Session when it sends a RESV message. Each LSP endpoint =
forwards traffic over the LSP only after the LSP Self Ping session =
terminates successfully<br class=3D"">
<br class=3D"">
4) Why does LSP Self Ping use MPLS Echo packets, as opposed to some =
other packet format?<br class=3D"">
<br class=3D"">
LSP Self Ping could have used many packet formats. The only hard =
requirement was to have one 64-bit field in which the 64 bit session =
identifier could be encoded. The MPLS Echo packet was convenient because =
its Senders Handle is 64-bits long.
<br class=3D"">
<br class=3D"">
I will update the draft to reflect this information.<br class=3D"">
<br class=3D"">
Ron Bonica<br class=3D"">
<br class=3D"">
_______________________________________________<br class=3D"">
mpls mailing list<br class=3D"">
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank" =
class=3D"">mpls@ietf.org</a><br class=3D"">
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" target=3D"_blank" =
class=3D"">https://www.ietf.org/mailman/listinfo/mpls</a><u =
class=3D""></u><u class=3D""></u></div>
</div>
</blockquote>
</div><div class=3D"MsoNormal"><u class=3D""></u>&nbsp;<u =
class=3D""></u></div>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<br class=3D"">
</div>
</div>
</div>
</div>
</span>
</div>

</div></blockquote></div><br class=3D""></div></body></html>=

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To: Ronald Bonica <rbonica@juniper.net>
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Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Ron,

I do not think the reason specifying it as LSP ping is correct.=20
Although you are using LSP ping Echo reply like packet format, it is not =
LSP ping packet as it doesn't confirm to RFC4379.
For ex: MPLS Echo Reply is only sent when MPLS Echo Request is received. =
Neither does it detect any dataplane failures, which is the title of the =
RFC.=20

Hence, I am not convinced that this ID warrants informational RFC, which =
is based on RFC4379.

But if you want to keep the ID out side the perview of RFC4379, then it =
should be updated accordingly and discussion should be on those lines.

cheers
-sam
> On Nov 21, 2014, at 2:19 PM, Ronald Bonica <rbonica@juniper.net> =
wrote:
>=20
> Shah,
> =20
> Because there are no interoperability implications, there is no need =
for a standards track RFC. However, because LSP Ping sends traffic =
off-box, an INFORMATIONAL RFC is appropriate. LSP Ping traffic might be =
detected by counters, intrusion detection devices and firewalls. We =
should document all of the OAM traffic that we generate.
> =20
>                                    Ron
> =20
> =20
> From: Shah, Himanshu [mailto:hshah@ciena.com]=20
> Sent: Thursday, November 20, 2014 7:05 PM
> To: Nobo Akiya (nobo); Sam Aldrin; Shahram Davari
> Cc: Thomas Nadeau; Ronald Bonica; mpls@ietf.org
> Subject: RE: [mpls] draft-bonica-mpls-self-ping: Response to comments =
from the mike
> =20
> Understand documenting helpful techniques (more useful during =
restoration/re-optimization cases) as informational RFC, but I believe =
IETF usually
> entertains proposals which has interoperability implications, AFAIK.
> =20
> Which is what others are saying as well=E2=80=A6
> =20
> Thanks,
> himanshu
> =20
> From: Nobo Akiya (nobo) [mailto:nobo@cisco.com =
<mailto:nobo@cisco.com>]=20
> Sent: Thursday, November 20, 2014 6:23 PM
> To: Sam Aldrin; Shahram Davari
> Cc: Shah, Himanshu; Thomas Nadeau; Ronald Bonica; mpls@ietf.org =
<mailto:mpls@ietf.org>
> Subject: RE: [mpls] draft-bonica-mpls-self-ping: Response to comments =
from the mike
> =20
> Thanks for not shooting me Sam but I=E2=80=99m really not the =
messenger J
> =20
> If there is a good proposal that covers set of LSP types with =
[virtually] no imitations, then documenting such proposal has an value, =
IMHO.
> =20
> I=E2=80=99d agree that current contents of this document may not =
provide sufficient value to be pursued as an informational document, but =
I=E2=80=99m not hopeless that something could come out of this.
> =20
> Thanks!
> =20
> -Nobo
> =20
> From: Sam Aldrin [mailto:aldrin.ietf@gmail.com =
<mailto:aldrin.ietf@gmail.com>]=20
> Sent: Thursday, November 20, 2014 2:57 PM
> To: Shahram Davari
> Cc: Nobo Akiya (nobo); Shah, Himanshu; Thomas Nadeau; Ronald Bonica; =
mpls@ietf.org <mailto:mpls@ietf.org>
> Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments =
from the mike
> =20
> Hi Nobo,
> =20
> [without shooting the messenger]
> =20
> In addition to what you listed, would like to see details on how  this =
ID will improve the performance at Egress should be clarified.
> i.e. IP routing Vs OAM process (w/o FEC validation). Also, how this =
model helps if reverse IP path is not available (inter-domain, reverse =
path broken, non-routable ingress IP address) and to what gain?
> =20
> There are many ways the LSP ping is being used, both as proprietary =
and also part of eco system.
> If we go by the logic that this ID is needed, we will have slew of new =
ID=E2=80=99s detailing different usage models.
> =20
> Hence, I totally agree with what Shahram and others have indicated.
> =20
> -sam
> =20
> On Nov 20, 2014, at 11:15 AM, Shahram Davari <davari@broadcom.com =
<mailto:davari@broadcom.com>> wrote:
> =20
> Hi,
>=20
> Since the procedures in this draft generates and processes the test =
packets on the same router and since other routers just forward =
normally,  why do we even need a draft? There is no interoperability =
requirements, and each vendor can implement what they like.
> =20
> Thanks
> Shahram
> =20
> From: mpls [mailto:mpls-bounces@ietf.org =
<mailto:mpls-bounces@ietf.org>] On Behalf Of Nobo Akiya (nobo)
> Sent: Thursday, November 20, 2014 10:57 AM
> To: Shah, Himanshu; Thomas D. Nadeau; Sam Aldrin
> Cc: Ronald Bonica; mpls@ietf.org <mailto:mpls@ietf.org>
> Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments =
from the mike
> =20
> Hi,
> =20
> Sort of summarizing what=E2=80=99s been stated but here=E2=80=99s my =
observation of draft-bonica-mpls-self-ping.
> =20
> 1.       LSP Ping and BFD MPLS already do what is being proposed.
> 2.       Ron needs a mechanism that is more efficient on egress LSRs, =
with respect to resources and operational aspects.
> 3.       Any probe packet having destination IP address as the ingress =
LSR has limitations in terms of how effective it can verify the DP =
readiness.
> 4.       The proposal by Ron is limited to those LSPs that signal via =
ordered mode (ex: LDP independent mode will not work) - same problem as =
(3).
> =20
> If the intent of draft-bonica-mpls-self-ping is just to document what =
has been implemented or what is being implemented, I=E2=80=99d like to =
request followings to be captured in the document.
> -          limitations (3 and 4) so that readers are aware of them.
> -          usage of non-127/8 address as destination IP address in =
MPLS echo request/reply deviates from RFC4379.
> =20
> If the intent of draft-bonica-mpls-self-ping is to advocate a =
mechanism for efficient MPLS DP readiness test, and I=E2=80=99d like to =
request that:
> -          requirements (2) are well captured.
> -          S-BFD be evaluated (as it addresses the efficiency =
requirements and does not have limitations described by 3 and 4).
> =20
> Himanshu, I have one comment in-line below. Please look for [NOBO].
> =20
> =20
> From: mpls [mailto:mpls-bounces@ietf.org =
<mailto:mpls-bounces@ietf.org>] On Behalf Of Shah, Himanshu
> Sent: Thursday, November 20, 2014 10:36 AM
> To: Thomas D. Nadeau; Sam Aldrin
> Cc: Ronald Bonica; mpls@ietf.org <mailto:mpls@ietf.org>
> Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments =
from the mike
> =20
> This is exactly what I said at Mic.
> We have been deploying MPLS for a while and if such DP active =
verification was necessary, vendors have solved it without
> standard specific solution, may that be BFD or self-ping.
> =20
> One of the argument made was that client BFD session detects that =
=E2=80=9Ctunnel is active but DP is not=E2=80=9D.
> Does it imply there is some kind of UNI signaling going on between PE =
and CE to indicate that tunnel has become
> active, commence data? And the idea is that PE will refrain =
notification until self-ping verify DP active?
> =20
> If that is not the case then this technique is not even useful =E2=80=93=
 self ping is not actually causing the DP to become active,
> If it doesn=E2=80=99t become active in the time window, what is PE =
going to do?
> =20
> [NOBO] That is another interesting aspect of the whole solution. =
However, I believe that the problem scope of this document is much =
smaller: ingress LSR to detect readiness of RSVP signaled LSP. For RSVP =
signaled LSP, only the LSP that is =E2=80=9Cpassing the test=E2=80=9D =
can be tied to the tunnel as the active LSP, so at least the ingress LSR =
will not pump traffic into the tunnel without knowing whether DP =
end-to-end is ready or not. Assuming that there are other ways to get to =
the egress LSR from this ingress LSR, then the problem is solved. =
Otherwise the ingress LSR will drop the traffic but the problem is =
contained to that network node (i.e. packets are not traversing un-ready =
LSP).
> =20
> Thanks!
> =20
> -Nobo
> =20
> =20
> /himanshu
> =20
> From: mpls [mailto:mpls-bounces@ietf.org =
<mailto:mpls-bounces@ietf.org>] On Behalf Of Thomas D. Nadeau
> Sent: Thursday, November 20, 2014 9:43 AM
> To: Sam Aldrin
> Cc: Ronald Bonica; mpls@ietf.org <mailto:mpls@ietf.org>
> Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments =
from the mike
> =20
>            =20
>             To me what is described in the draft seems like this is a =
description of a device/vendor feature that automates the basic =
procedures of 4379/etc.. This can and has been done for quite some time =
using other means such as onboard automated scripts/actions after paths =
are established/signaled. I say this not to be glib, but because I built =
such a thing about 10 years ago that has been deployed widely.  Also, as =
Sam says, there is some deviation from RFC4379 which we should ask is =
worth the additional complication (and required implementation + =
associated delay/etc...) versus just using the existing means.=20
> =20
>             The bottom line is that we should be asking ourselves =
whether or not this something we really need to standardize.
> =20
>             =E2=80=94Tom
> =20
> =20
> =20
> On Nov 19, 2014:10:28 PM, at 10:28 PM, Sam Aldrin =
<aldrin.ietf@gmail.com <mailto:aldrin.ietf@gmail.com>> wrote:
> =20
> Hi Ron,
> =20
> Still trying to understand the need for the draft, hence, have few of =
questions and need clarifications. Appreciate your response in advance.
> =20
> 1. (clarification q) The Ingress LSR sends the Echo request, with =
destination IP address to self, and forwards to Egress LSR (sec 2), =
correct?  Is this the only thing which identifies the Ingress LSR or =
something else too?
> 2. What happens if there is LSP breakage or something and the Echo =
request ends up on transit LSR? Doesn't it process? I see that draft =
says, this will avoid control plane processing. How so? The packet is =
forwarded from ingress to egress, which means, the egress will have to =
process the packet i.e. look up the ip address to send it back to =
ingress.
> =20
> Draft says "The egress LSR forwards the MPLS Echo message to its =
destination, the
>    ingress LSR.  The egress LSR forwards the MPLS Echo message exactly
>    as it would forward any other packet."
> =20
> Could you explain, how egress forwards the packet back to ingress w/o =
looking up the packet IP header i.e. in the data plane and no additional =
control plane of OAM process?
> 3. Is the assertion that, if Echo Reply is received back at the =
ingress then it is failure, rather it should receive Echo Request back =
at Ingress, correct?
> 4. Why can't you use LSP proxy ping to self via Egress?
> =20
> Will followup with additional questions, if any, based on your =
responses.
> =20
> cheers
> -sam
> =20
> On Nov 19, 2014, at 8:38 AM, Ronald Bonica <rbonica@juniper.net =
<mailto:rbonica@juniper.net>> wrote:
> =20
> Folks
>=20
> At IETF 91, the following points were raised with regard to =
draft-bonica-mpls-self-ping:
>=20
> 1) Why not use BFD?
> 2) Self-ping does not diagnose FIB programming errors in which an LSR =
other than the egress de-encapsulates and forwards the packet.
> 3) How does Self ping verify a bidirectional LSP's readiness to carry =
traffic in both directions?
> 4) Why does MPLS Self ping use MPLS Echo packets, as opposed to ICMP =
echo packets or some other packet format?
>=20
> Responses follow:
>=20
> 1) Why not use BFD?
>=20
> Self Ping is an extremely light-weight protocol. A typical Self Ping =
session emits one or two packets and terminates less than one second =
after initiation. Self-ping requires no configuration or control plane =
resources on the egress LSR.=20
>=20
> By contrast, BFD is designed to verify bi-directional connectivity =
over a longer period of time. Therefore, MPLS Self Ping is appropriate =
in environments where BFD is too resource intensive.
>=20
> 2) Self-ping does not diagnose programming errors in which an LSR =
other than the egress de-encapsulates and forwards the packet.
>=20
> Self Ping is designed to verify LSP readiness without consuming =
control plane resources on the egress router. It is not designed to =
diagnose programming errors in which an LSR other than the egress =
de-encapsulates and forwards the packet. Mechanisms that diagnose such =
issues are available [RFC 4950]. However, they are more resource =
intensive.
>=20
> 3) How does Self ping verify a bidirectional LSP's readiness to carry =
traffic in both directions?
>=20
> In order to verify bidirectional LSP readiness, RSVP instantiates two =
LSP Self Ping sessions, one at each end of the LSP. The LSR at one end =
of the LSP initiates a self ping session when it receives a RESV =
message. The LSR at the other end of the LSP initiates a Self Ping =
Session when it sends a RESV message. Each LSP endpoint forwards traffic =
over the LSP only after the LSP Self Ping session terminates =
successfully
>=20
> 4) Why does LSP Self Ping use MPLS Echo packets, as opposed to some =
other packet format?
>=20
> LSP Self Ping could have used many packet formats. The only hard =
requirement was to have one 64-bit field in which the 64 bit session =
identifier could be encoded. The MPLS Echo packet was convenient because =
its Senders Handle is 64-bits long.=20
>=20
> I will update the draft to reflect this information.
>=20
> Ron Bonica
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org <mailto:mpls@ietf.org>
> https://www.ietf.org/mailman/listinfo/mpls =
<https://www.ietf.org/mailman/listinfo/mpls>
> =20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org <mailto:mpls@ietf.org>
> https://www.ietf.org/mailman/listinfo/mpls =
<https://www.ietf.org/mailman/listinfo/mpls>

--Apple-Mail=_F1D605BD-80E2-4AA5-9F10-946219D7DA5F
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Ron,<div class=3D""><br class=3D""></div><div class=3D"">I do =
not think the reason specifying it as LSP ping is =
correct.&nbsp;</div><div class=3D"">Although you are using LSP ping Echo =
reply like packet format, it is not LSP ping packet as it doesn't =
confirm to RFC4379.</div><div class=3D"">For ex: MPLS Echo Reply is only =
sent when MPLS Echo Request is received. Neither does it detect any =
dataplane failures, which is the title of the RFC.&nbsp;</div><div =
class=3D""><br class=3D""></div><div class=3D"">Hence, I am not =
convinced that this ID warrants informational RFC, which is based on =
RFC4379.</div><div class=3D""><br class=3D""></div><div class=3D"">But =
if you want to keep the ID out side the perview of RFC4379, then it =
should be updated accordingly and discussion should be on those =
lines.</div><div class=3D""><br class=3D""></div><div =
class=3D"">cheers</div><div class=3D"">-sam<br class=3D""><div><blockquote=
 type=3D"cite" class=3D""><div class=3D"">On Nov 21, 2014, at 2:19 PM, =
Ronald Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" =
class=3D"">rbonica@juniper.net</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; line-height: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;"><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">Shah,<o:p class=3D""></o:p></span></div><div=
 style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">Because there are no interoperability =
implications, there is no need for a standards track RFC. However, =
because LSP Ping sends traffic off-box, an INFORMATIONAL RFC is =
appropriate. LSP Ping traffic might be detected by counters, intrusion =
detection devices and firewalls. We should document all of the OAM =
traffic that we generate.<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
Ron<o:p class=3D""></o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;</span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span></div><div style=3D"border-style: none none none =
solid; border-left-color: blue; border-left-width: 1.5pt; padding: 0in =
0in 0in 4pt;" class=3D""><div class=3D""><div style=3D"border-style: =
solid none none; border-top-color: rgb(225, 225, 225); border-top-width: =
1pt; padding: 3pt 0in 0in;" class=3D""><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><b class=3D""><span style=3D"font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">From:</span></b><span style=3D"font-size:=
 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>Shah, Himanshu [<a =
href=3D"mailto:hshah@ciena.com" =
class=3D"">mailto:hshah@ciena.com</a>]<span =
class=3D"Apple-converted-space">&nbsp;</span><br class=3D""><b =
class=3D"">Sent:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Thursday, November 20, 2014 =
7:05 PM<br class=3D""><b class=3D"">To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Nobo Akiya (nobo); Sam =
Aldrin; Shahram Davari<br class=3D""><b class=3D"">Cc:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Thomas Nadeau; Ronald =
Bonica; <a href=3D"mailto:mpls@ietf.org" class=3D"">mpls@ietf.org</a><br =
class=3D""><b class=3D"">Subject:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>RE: [mpls] =
draft-bonica-mpls-self-ping: Response to comments from the mike<o:p =
class=3D""></o:p></span></div></div></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><i class=3D""><span style=3D"font-size: 11pt; font-family: =
Cambria, serif; color: rgb(0, 64, 192);" class=3D"">Understand =
documenting helpful techniques (more useful during =
restoration/re-optimization cases) as informational RFC, but I believe =
IETF usually<o:p class=3D""></o:p></span></i></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><i class=3D""><span style=3D"font-size: 11pt; =
font-family: Cambria, serif; color: rgb(0, 64, 192);" =
class=3D"">entertains proposals which has interoperability implications, =
AFAIK.<o:p class=3D""></o:p></span></i></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><i class=3D""><span style=3D"font-size: 11pt; font-family: =
Cambria, serif; color: rgb(0, 64, 192);" =
class=3D"">&nbsp;</span></i></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><i class=3D""><span style=3D"font-size: 11pt; font-family: =
Cambria, serif; color: rgb(0, 64, 192);" class=3D"">Which is what others =
are saying as well=E2=80=A6<o:p class=3D""></o:p></span></i></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><i class=3D""><span style=3D"font-size: =
11pt; font-family: Cambria, serif; color: rgb(0, 64, 192);" =
class=3D"">&nbsp;</span></i></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><i class=3D""><span style=3D"font-size: 11pt; font-family: =
Cambria, serif; color: rgb(0, 64, 192);" class=3D"">Thanks,<o:p =
class=3D""></o:p></span></i></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><i class=3D""><span style=3D"font-size: 11pt; font-family: =
Cambria, serif; color: rgb(0, 64, 192);" class=3D"">himanshu<o:p =
class=3D""></o:p></span></i></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><i class=3D""><span style=3D"font-size: 11pt; font-family: =
Cambria, serif; color: rgb(0, 64, 192);" =
class=3D"">&nbsp;</span></i></div><div class=3D""><div =
style=3D"border-style: solid none none; border-top-color: rgb(181, 196, =
223); border-top-width: 1pt; padding: 3pt 0in 0in;" class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><b class=3D""><span style=3D"font-size: =
10pt; font-family: Tahoma, sans-serif;" class=3D"">From:</span></b><span =
style=3D"font-size: 10pt; font-family: Tahoma, sans-serif;" =
class=3D""><span class=3D"Apple-converted-space">&nbsp;</span>Nobo Akiya =
(nobo) [<a href=3D"mailto:nobo@cisco.com" style=3D"color: purple; =
text-decoration: underline;" class=3D"">mailto:nobo@cisco.com</a>]<span =
class=3D"Apple-converted-space">&nbsp;</span><br class=3D""><b =
class=3D"">Sent:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Thursday, November 20, 2014 =
6:23 PM<br class=3D""><b class=3D"">To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Sam Aldrin; Shahram =
Davari<br class=3D""><b class=3D"">Cc:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Shah, Himanshu; Thomas =
Nadeau; Ronald Bonica;<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:mpls@ietf.org" style=3D"color: purple; text-decoration: =
underline;" class=3D"">mpls@ietf.org</a><br class=3D""><b =
class=3D"">Subject:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>RE: [mpls] =
draft-bonica-mpls-self-ping: Response to comments from the mike<o:p =
class=3D""></o:p></span></div></div></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">Thanks for not =
shooting me Sam but I=E2=80=99m really not the messenger<span =
class=3D"Apple-converted-space">&nbsp;</span></span><span lang=3D"EN-CA" =
style=3D"font-size: 11pt; font-family: Wingdings; color: rgb(31, 73, =
125);" class=3D"">J</span><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D""></o:p></span></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">If there is a good =
proposal that covers set of LSP types with [virtually] no imitations, =
then documenting such proposal has an value, IMHO.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;</span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">I=E2=80=99d agree that current contents of this document may =
not provide sufficient value to be pursued as an informational document, =
but I=E2=80=99m not hopeless that something could come out of this.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;</span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">Thanks!<o:p class=3D""></o:p></span></div><div style=3D"margin:=
 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">-Nobo<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;</span></div><div =
style=3D"border-style: none none none solid; border-left-color: blue; =
border-left-width: 1.5pt; padding: 0in 0in 0in 4pt;" class=3D""><div =
class=3D""><div style=3D"border-style: solid none none; =
border-top-color: rgb(181, 196, 223); border-top-width: 1pt; padding: =
3pt 0in 0in;" class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><b =
class=3D""><span style=3D"font-size: 10pt; font-family: Tahoma, =
sans-serif;" class=3D"">From:</span></b><span style=3D"font-size: 10pt; =
font-family: Tahoma, sans-serif;" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>Sam Aldrin [<a =
href=3D"mailto:aldrin.ietf@gmail.com" style=3D"color: purple; =
text-decoration: underline;" =
class=3D"">mailto:aldrin.ietf@gmail.com</a>]<span =
class=3D"Apple-converted-space">&nbsp;</span><br class=3D""><b =
class=3D"">Sent:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Thursday, November 20, 2014 =
2:57 PM<br class=3D""><b class=3D"">To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Shahram Davari<br =
class=3D""><b class=3D"">Cc:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Nobo Akiya (nobo); Shah, =
Himanshu; Thomas Nadeau; Ronald Bonica;<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:mpls@ietf.org" style=3D"color: purple; text-decoration: =
underline;" class=3D"">mpls@ietf.org</a><br class=3D""><b =
class=3D"">Subject:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Re: [mpls] =
draft-bonica-mpls-self-ping: Response to comments from the mike<o:p =
class=3D""></o:p></span></div></div></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span lang=3D"EN-CA" class=3D"">&nbsp;</span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span lang=3D"EN-CA" class=3D"">Hi =
Nobo,<o:p class=3D""></o:p></span></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span lang=3D"EN-CA" =
class=3D"">&nbsp;</span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" class=3D"">[without shooting the =
messenger]<o:p class=3D""></o:p></span></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span lang=3D"EN-CA" =
class=3D"">&nbsp;</span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" class=3D"">In addition to what =
you listed, would like to see details on how &nbsp;this ID will improve =
the performance at Egress should be clarified.<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" class=3D"">i.e. IP routing Vs =
OAM process (w/o FEC validation). Also, how this model helps if reverse =
IP path is not available (inter-domain, reverse path broken, =
non-routable ingress IP address) and to what gain?<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" =
class=3D"">&nbsp;</span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" class=3D"">There are many ways =
the LSP ping is being used, both as proprietary and also part of eco =
system.<o:p class=3D""></o:p></span></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span lang=3D"EN-CA" class=3D"">If we go =
by the logic that this ID is needed, we will have slew of new ID=E2=80=99s=
 detailing different usage models.<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" =
class=3D"">&nbsp;</span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" class=3D"">Hence, I totally =
agree with what Shahram and others have indicated.<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" =
class=3D"">&nbsp;</span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" class=3D"">-sam<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" =
class=3D"">&nbsp;</span></div></div><div class=3D""><blockquote =
style=3D"margin-top: 5pt; margin-bottom: 5pt;" class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span lang=3D"EN-CA" =
class=3D"">On Nov 20, 2014, at 11:15 AM, Shahram Davari &lt;<a =
href=3D"mailto:davari@broadcom.com" style=3D"color: purple; =
text-decoration: underline;" class=3D"">davari@broadcom.com</a>&gt; =
wrote:<o:p class=3D""></o:p></span></div></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span lang=3D"EN-CA" class=3D"">&nbsp;</span></div><div =
class=3D""><div class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">Hi,</span><span =
lang=3D"EN-CA" class=3D""><o:p class=3D""></o:p></span></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span lang=3D"EN-CA" =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D""><br class=3D"">Since the procedures in =
this draft generates and processes the test packets on the same router =
and since other routers just forward normally, &nbsp;why do we even need =
a draft? There is no interoperability requirements, and each vendor can =
implement what they like.</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">Thanks</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">Shahram</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div =
style=3D"border-style: solid none none; border-top-color: rgb(181, 196, =
223); border-top-width: 1pt; padding: 3pt 0in 0in;" class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><b class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 10pt; font-family: Tahoma, =
sans-serif;" class=3D"">From:</span></b><span =
class=3D"apple-converted-space"><span lang=3D"EN-CA" style=3D"font-size: =
10pt; font-family: Tahoma, sans-serif;" =
class=3D"">&nbsp;</span></span><span lang=3D"EN-CA" style=3D"font-size: =
10pt; font-family: Tahoma, sans-serif;" class=3D"">mpls [<a =
href=3D"mailto:mpls-bounces@ietf.org" style=3D"color: purple; =
text-decoration: underline;" =
class=3D"">mailto:mpls-bounces@ietf.org</a>]<span =
class=3D"apple-converted-space">&nbsp;</span><b class=3D"">On Behalf =
Of<span class=3D"apple-converted-space">&nbsp;</span></b>Nobo Akiya =
(nobo)<br class=3D""><b class=3D"">Sent:</b><span =
class=3D"apple-converted-space">&nbsp;</span>Thursday, November 20, 2014 =
10:57 AM<br class=3D""><b class=3D"">To:</b><span =
class=3D"apple-converted-space">&nbsp;</span>Shah, Himanshu; Thomas D. =
Nadeau; Sam Aldrin<br class=3D""><b class=3D"">Cc:</b><span =
class=3D"apple-converted-space">&nbsp;</span>Ronald Bonica;<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:mpls@ietf.org" style=3D"color: purple; text-decoration: =
underline;" class=3D"">mpls@ietf.org</a><br class=3D""><b =
class=3D"">Subject:</b><span =
class=3D"apple-converted-space">&nbsp;</span>Re: [mpls] =
draft-bonica-mpls-self-ping: Response to comments from the =
mike</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span lang=3D"EN-CA" class=3D"">&nbsp;<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">Hi,</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">Sort of summarizing what=E2=80=99s been stated but here=E2=80=99=
s my observation of draft-bonica-mpls-self-ping.</span><span =
lang=3D"EN-CA" class=3D""><o:p class=3D""></o:p></span></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span lang=3D"EN-CA" =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">&nbsp;</span><span lang=3D"EN-CA" =
class=3D""><o:p class=3D""></o:p></span></div></div><div =
style=3D"margin-left: 0.5in;" class=3D""><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
text-indent: -0.25in;" class=3D""><span lang=3D"EN-CA" style=3D"font-size:=
 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">1.</span><span lang=3D"EN-CA" style=3D"font-size: 7pt; color: =
rgb(31, 73, 125);" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span></span><span lang=3D"EN-CA" =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">LSP Ping and BFD MPLS already do what is =
being proposed.</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div style=3D"margin-left: 0.5in;" =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; text-indent: -0.25in;" =
class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">2.</span><span =
lang=3D"EN-CA" style=3D"font-size: 7pt; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span></span><span lang=3D"EN-CA" =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">Ron needs a mechanism that is more =
efficient on egress LSRs, with respect to resources and operational =
aspects.</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div style=3D"margin-left: 0.5in;" =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; text-indent: -0.25in;" =
class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">3.</span><span =
lang=3D"EN-CA" style=3D"font-size: 7pt; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span></span><span lang=3D"EN-CA" =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">Any probe packet having destination IP =
address as the ingress LSR has limitations in terms of how effective it =
can verify the DP readiness.</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div style=3D"margin-left: 0.5in;" =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; text-indent: -0.25in;" =
class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">4.</span><span =
lang=3D"EN-CA" style=3D"font-size: 7pt; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span></span><span lang=3D"EN-CA" =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">The proposal by Ron is limited to those =
LSPs that signal via ordered mode (ex: LDP independent mode will not =
work) - same problem as (3).</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">If =
the intent of draft-bonica-mpls-self-ping is just to document what has =
been implemented or what is being implemented, I=E2=80=99d like to =
request followings to be captured in the document.</span><span =
lang=3D"EN-CA" class=3D""><o:p class=3D""></o:p></span></div></div><div =
style=3D"margin-left: 0.5in;" class=3D""><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
text-indent: -0.25in;" class=3D""><span lang=3D"EN-CA" style=3D"font-size:=
 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">-</span><span lang=3D"EN-CA" style=3D"font-size: 7pt; color: =
rgb(31, 73, 125);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span></span><span lang=3D"EN-CA" =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">limitations (3 and 4) so that readers are =
aware of them.</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div style=3D"margin-left: 0.5in;" =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; text-indent: -0.25in;" =
class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">-</span><span =
lang=3D"EN-CA" style=3D"font-size: 7pt; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span></span><span lang=3D"EN-CA" =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">usage of non-127/8 address as destination =
IP address in MPLS echo request/reply deviates from RFC4379.</span><span =
lang=3D"EN-CA" class=3D""><o:p class=3D""></o:p></span></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span lang=3D"EN-CA" =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">&nbsp;</span><span lang=3D"EN-CA" =
class=3D""><o:p class=3D""></o:p></span></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">If the intent of draft-bonica-mpls-self-ping is to advocate a =
mechanism for efficient MPLS DP readiness test, and I=E2=80=99d like to =
request that:</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div style=3D"margin-left: 0.5in;" =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; text-indent: -0.25in;" =
class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">-</span><span =
lang=3D"EN-CA" style=3D"font-size: 7pt; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span></span><span lang=3D"EN-CA" =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">requirements (2) are well =
captured.</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div style=3D"margin-left: 0.5in;" =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; text-indent: -0.25in;" =
class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">-</span><span =
lang=3D"EN-CA" style=3D"font-size: 7pt; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span></span><span lang=3D"EN-CA" =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">S-BFD be evaluated (as it addresses the =
efficiency requirements and does not have limitations described by 3 and =
4).</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">Himanshu, I have one comment in-line below. Please look for =
[NOBO].</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div style=3D"border-style: none =
none none solid; border-left-color: blue; border-left-width: 1.5pt; =
padding: 0in 0in 0in 4pt;" class=3D""><div class=3D""><div =
style=3D"border-style: solid none none; border-top-color: rgb(181, 196, =
223); border-top-width: 1pt; padding: 3pt 0in 0in;" class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><b class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 10pt; font-family: Tahoma, =
sans-serif;" class=3D"">From:</span></b><span =
class=3D"apple-converted-space"><span lang=3D"EN-CA" style=3D"font-size: =
10pt; font-family: Tahoma, sans-serif;" =
class=3D"">&nbsp;</span></span><span lang=3D"EN-CA" style=3D"font-size: =
10pt; font-family: Tahoma, sans-serif;" class=3D"">mpls [<a =
href=3D"mailto:mpls-bounces@ietf.org" style=3D"color: purple; =
text-decoration: underline;" class=3D""><span style=3D"color: purple;" =
class=3D"">mailto:mpls-bounces@ietf.org</span></a>]<span =
class=3D"apple-converted-space">&nbsp;</span><b class=3D"">On Behalf =
Of<span class=3D"apple-converted-space">&nbsp;</span></b>Shah, =
Himanshu<br class=3D""><b class=3D"">Sent:</b><span =
class=3D"apple-converted-space">&nbsp;</span>Thursday, November 20, 2014 =
10:36 AM<br class=3D""><b class=3D"">To:</b><span =
class=3D"apple-converted-space">&nbsp;</span>Thomas D. Nadeau; Sam =
Aldrin<br class=3D""><b class=3D"">Cc:</b><span =
class=3D"apple-converted-space">&nbsp;</span>Ronald Bonica;<span =
class=3D"apple-converted-space">&nbsp;</span><a =
href=3D"mailto:mpls@ietf.org" style=3D"color: purple; text-decoration: =
underline;" class=3D""><span style=3D"color: purple;" =
class=3D"">mpls@ietf.org</span></a><br class=3D""><b =
class=3D"">Subject:</b><span =
class=3D"apple-converted-space">&nbsp;</span>Re: [mpls] =
draft-bonica-mpls-self-ping: Response to comments from the =
mike</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span lang=3D"EN-CA" class=3D"">&nbsp;<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><i class=3D""><span lang=3D"EN-CA" style=3D"font-size: =
11pt; font-family: Cambria, serif; color: rgb(0, 64, 192);" =
class=3D"">This is exactly what I said at Mic.</span></i><span =
lang=3D"EN-CA" class=3D""><o:p class=3D""></o:p></span></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><i class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Cambria, serif; =
color: rgb(0, 64, 192);" class=3D"">We have been deploying MPLS for a =
while and if such DP active verification was necessary, vendors have =
solved it without</span></i><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><i class=3D""><span lang=3D"EN-CA" style=3D"font-size: =
11pt; font-family: Cambria, serif; color: rgb(0, 64, 192);" =
class=3D"">standard specific solution, may that be BFD or =
self-ping.</span></i><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><i class=3D""><span lang=3D"EN-CA" style=3D"font-size: =
11pt; font-family: Cambria, serif; color: rgb(0, 64, 192);" =
class=3D"">&nbsp;</span></i><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><i class=3D""><span lang=3D"EN-CA" style=3D"font-size: =
11pt; font-family: Cambria, serif; color: rgb(0, 64, 192);" class=3D"">One=
 of the argument made was that client BFD session detects that =E2=80=9Ctu=
nnel is active but DP is not=E2=80=9D.</span></i><span lang=3D"EN-CA" =
class=3D""><o:p class=3D""></o:p></span></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><i class=3D""><span lang=3D"EN-CA" =
style=3D"font-size: 11pt; font-family: Cambria, serif; color: rgb(0, 64, =
192);" class=3D"">Does it imply there is some kind of UNI signaling =
going on between PE and CE to indicate that tunnel has =
become</span></i><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><i class=3D""><span lang=3D"EN-CA" style=3D"font-size: =
11pt; font-family: Cambria, serif; color: rgb(0, 64, 192);" =
class=3D"">active, commence data? And the idea is that PE will refrain =
notification until self-ping verify DP active?</span></i><span =
lang=3D"EN-CA" class=3D""><o:p class=3D""></o:p></span></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><i class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 11pt; font-family: Cambria, serif; =
color: rgb(0, 64, 192);" class=3D"">&nbsp;</span></i><span lang=3D"EN-CA" =
class=3D""><o:p class=3D""></o:p></span></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><i class=3D""><span lang=3D"EN-CA" =
style=3D"font-size: 11pt; font-family: Cambria, serif; color: rgb(0, 64, =
192);" class=3D"">If that is not the case then this technique is not =
even useful =E2=80=93 self ping is not actually causing the DP to become =
active,</span></i><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><i class=3D""><span lang=3D"EN-CA" style=3D"font-size: =
11pt; font-family: Cambria, serif; color: rgb(0, 64, 192);" class=3D"">If =
it doesn=E2=80=99t become active in the time window, what is PE going to =
do?</span></i><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><i class=3D""><span lang=3D"EN-CA" style=3D"font-size: =
11pt; font-family: Cambria, serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span></i><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">[NOBO] That is another interesting aspect of the whole =
solution. However, I believe that the problem scope of this document is =
much smaller: ingress LSR to detect readiness of RSVP signaled LSP. For =
RSVP signaled LSP, only the LSP that is =E2=80=9Cpassing the test=E2=80=9D=
 can be tied to the tunnel as the active LSP, so at least the ingress =
LSR will not pump traffic into the tunnel without knowing whether DP =
end-to-end is ready or not. Assuming that there are other ways to get to =
the egress LSR from this ingress LSR, then the problem is solved. =
Otherwise the ingress LSR will drop the traffic but the problem is =
contained to that network node (i.e. packets are not traversing un-ready =
LSP).</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">Thanks!</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">-Nobo</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-CA" style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><i class=3D""><span lang=3D"EN-CA" style=3D"font-size: =
11pt; font-family: Cambria, serif; color: rgb(0, 64, 192);" =
class=3D"">/himanshu</span></i><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><i class=3D""><span lang=3D"EN-CA" style=3D"font-size: =
11pt; font-family: Cambria, serif; color: rgb(0, 64, 192);" =
class=3D"">&nbsp;</span></i><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div =
style=3D"border-style: solid none none; border-top-color: rgb(181, 196, =
223); border-top-width: 1pt; padding: 3pt 0in 0in;" class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><b class=3D""><span =
lang=3D"EN-CA" style=3D"font-size: 10pt; font-family: Tahoma, =
sans-serif;" class=3D"">From:</span></b><span =
class=3D"apple-converted-space"><span lang=3D"EN-CA" style=3D"font-size: =
10pt; font-family: Tahoma, sans-serif;" =
class=3D"">&nbsp;</span></span><span lang=3D"EN-CA" style=3D"font-size: =
10pt; font-family: Tahoma, sans-serif;" class=3D"">mpls [<a =
href=3D"mailto:mpls-bounces@ietf.org" style=3D"color: purple; =
text-decoration: underline;" class=3D""><span style=3D"color: purple;" =
class=3D"">mailto:mpls-bounces@ietf.org</span></a>]<span =
class=3D"apple-converted-space">&nbsp;</span><b class=3D"">On Behalf =
Of<span class=3D"apple-converted-space">&nbsp;</span></b>Thomas D. =
Nadeau<br class=3D""><b class=3D"">Sent:</b><span =
class=3D"apple-converted-space">&nbsp;</span>Thursday, November 20, 2014 =
9:43 AM<br class=3D""><b class=3D"">To:</b><span =
class=3D"apple-converted-space">&nbsp;</span>Sam Aldrin<br class=3D""><b =
class=3D"">Cc:</b><span =
class=3D"apple-converted-space">&nbsp;</span>Ronald Bonica;<span =
class=3D"apple-converted-space">&nbsp;</span><a =
href=3D"mailto:mpls@ietf.org" style=3D"color: purple; text-decoration: =
underline;" class=3D""><span style=3D"color: purple;" =
class=3D"">mpls@ietf.org</span></a><br class=3D""><b =
class=3D"">Subject:</b><span =
class=3D"apple-converted-space">&nbsp;</span>Re: [mpls] =
draft-bonica-mpls-self-ping: Response to comments from the =
mike</span><span lang=3D"EN-CA" class=3D""><o:p =
class=3D""></o:p></span></div></div></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span lang=3D"EN-CA" class=3D"">&nbsp;<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span class=3D"apple-tab-span"><span lang=3D"EN-CA" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;</span></span><span class=3D"apple-converted-space"><span =
lang=3D"EN-CA" class=3D"">&nbsp;</span></span><span lang=3D"EN-CA" =
class=3D""><o:p class=3D""></o:p></span></div></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span =
class=3D"apple-tab-span"><span lang=3D"EN-CA" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;</span></span><span class=3D"apple-converted-space"><span =
lang=3D"EN-CA" class=3D"">&nbsp;</span></span><span lang=3D"EN-CA" =
class=3D"">To me what is described in the draft seems like this is a =
description of a device/vendor feature that automates the basic =
procedures of 4379/etc.. This can and has been done for quite some time =
using other means such as onboard automated scripts/actions after paths =
are established/signaled. I say this not to be glib, but because I built =
such a thing about 10 years ago that has been deployed widely. =
&nbsp;Also, as Sam says, there is some deviation from RFC4379 which we =
should ask is worth the additional complication (and required =
implementation + associated delay/etc...) versus just using the existing =
means.&nbsp;<o:p class=3D""></o:p></span></div></div></div><div =
class=3D""><div class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" class=3D"">&nbsp;<o:p =
class=3D""></o:p></span></div></div></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span =
class=3D"apple-tab-span"><span lang=3D"EN-CA" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;</span></span><span class=3D"apple-converted-space"><span =
lang=3D"EN-CA" class=3D"">&nbsp;</span></span><span lang=3D"EN-CA" =
class=3D"">The bottom line is that we should be asking ourselves whether =
or not this something we really need to standardize.<o:p =
class=3D""></o:p></span></div></div></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span lang=3D"EN-CA" =
class=3D"">&nbsp;<o:p class=3D""></o:p></span></div></div></div><div =
class=3D""><div class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
class=3D"apple-tab-span"><span lang=3D"EN-CA" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;</span></span><span class=3D"apple-converted-space"><span =
lang=3D"EN-CA" class=3D"">&nbsp;</span></span><span lang=3D"EN-CA" =
class=3D"">=E2=80=94Tom<o:p class=3D""></o:p></span></div></div></div><div=
 class=3D""><div class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" class=3D"">&nbsp;<o:p =
class=3D""></o:p></span></div></div></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span lang=3D"EN-CA" =
class=3D"">&nbsp;<o:p class=3D""></o:p></span></div></div></div><div =
class=3D""><div class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" class=3D"">&nbsp;<o:p =
class=3D""></o:p></span></div></div><div class=3D""><blockquote =
style=3D"margin-top: 5pt; margin-bottom: 5pt;" class=3D""><div =
class=3D""><div class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" class=3D"">On Nov 19, 2014:10:28 PM, at 10:28 PM, Sam =
Aldrin &lt;<a href=3D"mailto:aldrin.ietf@gmail.com" style=3D"color: =
purple; text-decoration: underline;" class=3D""><span style=3D"color: =
purple;" class=3D"">aldrin.ietf@gmail.com</span></a>&gt; wrote:<o:p =
class=3D""></o:p></span></div></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span lang=3D"EN-CA" class=3D"">&nbsp;<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span lang=3D"EN-CA" =
class=3D"">Hi Ron,<o:p class=3D""></o:p></span></div></div><div =
class=3D""><div class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" class=3D"">&nbsp;<o:p =
class=3D""></o:p></span></div></div></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span lang=3D"EN-CA" =
class=3D"">Still trying to understand the need for the draft, hence, =
have few of questions and need clarifications. Appreciate your response =
in advance.<o:p class=3D""></o:p></span></div></div></div><div =
class=3D""><div class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" class=3D"">&nbsp;<o:p =
class=3D""></o:p></span></div></div></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span lang=3D"EN-CA" =
class=3D"">1. (clarification q) The Ingress LSR sends the Echo request, =
with destination IP address to self, and forwards to Egress LSR (sec 2), =
correct? &nbsp;Is this the only thing which identifies the Ingress LSR =
or something else too?<o:p class=3D""></o:p></span></div></div></div><div =
class=3D""><div class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" class=3D"">2. What happens if there is LSP breakage or =
something and the Echo request ends up on transit LSR? Doesn't it =
process? I see that draft says, this will avoid control plane =
processing. How so? The packet is forwarded from ingress to egress, =
which means, the egress will have to process the packet i.e. look up the =
ip address to send it back to ingress.<o:p =
class=3D""></o:p></span></div></div></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span lang=3D"EN-CA" =
class=3D"">&nbsp;<o:p class=3D""></o:p></span></div></div></div><div =
class=3D""><div class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" class=3D"">Draft says "</span><span lang=3D"EN-CA" =
style=3D"font-size: 10pt;" class=3D"">The egress LSR forwards the MPLS =
Echo message to its destination, the</span><span lang=3D"EN-CA" =
class=3D""><o:p class=3D""></o:p></span></div></div></div><pre =
style=3D"margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: =
'Courier New'; line-height: 14.4pt;" class=3D""><span lang=3D"EN-CA" =
class=3D"">&nbsp;&nbsp; ingress LSR.&nbsp; The egress LSR forwards the =
MPLS Echo message exactly<o:p class=3D""></o:p></span></pre><pre =
style=3D"margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: =
'Courier New'; line-height: 14.4pt;" class=3D""><span lang=3D"EN-CA" =
class=3D"">&nbsp;&nbsp; as it would forward any other packet."<o:p =
class=3D""></o:p></span></pre><pre style=3D"margin: 0in 0in 0.0001pt; =
font-size: 10pt; font-family: 'Courier New'; line-height: 14.4pt;" =
class=3D""><span lang=3D"EN-CA" class=3D"">&nbsp;<o:p =
class=3D""></o:p></span></pre><pre style=3D"margin: 0in 0in 0.0001pt; =
font-size: 10pt; font-family: 'Courier New'; line-height: 14.4pt;" =
class=3D""><span lang=3D"EN-CA" class=3D"">Could you explain, how egress =
forwards the packet back to ingress w/o looking up the packet IP header =
i.e. in the data plane and no additional control plane of OAM =
process?<o:p class=3D""></o:p></span></pre><div class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span lang=3D"EN-CA" =
class=3D"">3. Is the assertion that, if Echo Reply is received back at =
the ingress then it is failure, rather it should receive Echo Request =
back at Ingress, correct?<o:p =
class=3D""></o:p></span></div></div></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span lang=3D"EN-CA" =
class=3D"">4. Why can't you use LSP proxy ping to self via Egress?<o:p =
class=3D""></o:p></span></div></div></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span lang=3D"EN-CA" =
class=3D"">&nbsp;<o:p class=3D""></o:p></span></div></div></div><div =
class=3D""><div class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" class=3D"">Will followup with additional questions, if =
any, based on your responses.<o:p =
class=3D""></o:p></span></div></div></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span lang=3D"EN-CA" =
class=3D"">&nbsp;<o:p class=3D""></o:p></span></div></div></div><div =
class=3D""><div class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" class=3D"">cheers<o:p =
class=3D""></o:p></span></div></div></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span lang=3D"EN-CA" =
class=3D"">-sam<o:p class=3D""></o:p></span></div></div></div><div =
class=3D""><div class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" class=3D"">&nbsp;<o:p =
class=3D""></o:p></span></div></div><div class=3D""><blockquote =
style=3D"margin-top: 5pt; margin-bottom: 5pt;" class=3D""><div =
class=3D""><div class=3D""><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
lang=3D"EN-CA" class=3D"">On Nov 19, 2014, at 8:38 AM, Ronald Bonica =
&lt;<a href=3D"mailto:rbonica@juniper.net" style=3D"color: purple; =
text-decoration: underline;" class=3D""><span style=3D"color: purple;" =
class=3D"">rbonica@juniper.net</span></a>&gt; wrote:<o:p =
class=3D""></o:p></span></div></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span lang=3D"EN-CA" class=3D"">&nbsp;<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span lang=3D"EN-CA" class=3D"">Folks<br =
class=3D""><br class=3D"">At IETF 91, the following points were raised =
with regard to draft-bonica-mpls-self-ping:<br class=3D""><br =
class=3D"">1) Why not use BFD?<br class=3D"">2) Self-ping does not =
diagnose FIB programming errors in which an LSR other than the egress =
de-encapsulates and forwards the packet.<br class=3D"">3) How does Self =
ping verify a bidirectional LSP's readiness to carry traffic in both =
directions?<br class=3D"">4) Why does MPLS Self ping use MPLS Echo =
packets, as opposed to ICMP echo packets or some other packet format?<br =
class=3D""><br class=3D"">Responses follow:<br class=3D""><br =
class=3D"">1) Why not use BFD?<br class=3D""><br class=3D"">Self Ping is =
an extremely light-weight protocol. A typical Self Ping session emits =
one or two packets and terminates less than one second after initiation. =
Self-ping requires no configuration or control plane resources on the =
egress LSR.<span class=3D"apple-converted-space">&nbsp;</span><br =
class=3D""><br class=3D"">By contrast, BFD is designed to verify =
bi-directional connectivity over a longer period of time. Therefore, =
MPLS Self Ping is appropriate in environments where BFD is too resource =
intensive.<br class=3D""><br class=3D"">2) Self-ping does not diagnose =
programming errors in which an LSR other than the egress de-encapsulates =
and forwards the packet.<br class=3D""><br class=3D"">Self Ping is =
designed to verify LSP readiness without consuming control plane =
resources on the egress router. It is not designed to diagnose =
programming errors in which an LSR other than the egress de-encapsulates =
and forwards the packet. Mechanisms that diagnose such issues are =
available [RFC 4950]. However, they are more resource intensive.<br =
class=3D""><br class=3D"">3) How does Self ping verify a bidirectional =
LSP's readiness to carry traffic in both directions?<br class=3D""><br =
class=3D"">In order to verify bidirectional LSP readiness, RSVP =
instantiates two LSP Self Ping sessions, one at each end of the LSP. The =
LSR at one end of the LSP initiates a self ping session when it receives =
a RESV message. The LSR at the other end of the LSP initiates a Self =
Ping Session when it sends a RESV message. Each LSP endpoint forwards =
traffic over the LSP only after the LSP Self Ping session terminates =
successfully<br class=3D""><br class=3D"">4) Why does LSP Self Ping use =
MPLS Echo packets, as opposed to some other packet format?<br =
class=3D""><br class=3D"">LSP Self Ping could have used many packet =
formats. The only hard requirement was to have one 64-bit field in which =
the 64 bit session identifier could be encoded. The MPLS Echo packet was =
convenient because its Senders Handle is 64-bits long.<span =
class=3D"apple-converted-space">&nbsp;</span><br class=3D""><br =
class=3D"">I will update the draft to reflect this information.<br =
class=3D""><br class=3D"">Ron Bonica<br class=3D""><br =
class=3D"">_______________________________________________<br =
class=3D"">mpls mailing list<br class=3D""><a =
href=3D"mailto:mpls@ietf.org" style=3D"color: purple; text-decoration: =
underline;" class=3D""><span style=3D"color: purple;" =
class=3D"">mpls@ietf.org</span></a><br class=3D""><a =
href=3D"https://www.ietf.org/mailman/listinfo/mpls" style=3D"color: =
purple; text-decoration: underline;" class=3D""><span style=3D"color: =
purple;" =
class=3D"">https://www.ietf.org/mailman/listinfo/mpls</span></a><o:p =
class=3D""></o:p></span></div></div></div></blockquote></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span lang=3D"EN-CA" =
class=3D"">&nbsp;<o:p class=3D""></o:p></span></div></div></div></div><div=
 class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span lang=3D"EN-CA" =
class=3D"">_______________________________________________<br =
class=3D"">mpls mailing list<br class=3D""><a =
href=3D"mailto:mpls@ietf.org" style=3D"color: purple; text-decoration: =
underline;" class=3D""><span style=3D"color: purple;" =
class=3D"">mpls@ietf.org</span></a><br class=3D""><a =
href=3D"https://www.ietf.org/mailman/listinfo/mpls" style=3D"color: =
purple; text-decoration: underline;" class=3D""><span style=3D"color: =
purple;" =
class=3D"">https://www.ietf.org/mailman/listinfo/mpls</span></a></span></d=
iv></div></div></blockquote></div></div></div></div></blockquote></div></d=
iv></div></div></div></blockquote></div><br =
class=3D""></div></body></html>=

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Subject: Re: [mpls] Pete Resnick's Block on charter-ietf-mpls-06-04: (with BLOCK and COMMENT)
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----- Original Message -----
From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'Pete Resnick'" <presnick@qti.qualcomm.com>
Cc: <mpls@ietf.org>; <mpls-chairs@tools.ietf.org>; "'The IESG'"
<iesg@ietf.org>
Sent: Monday, November 24, 2014 9:23 PM
> > I think we can get a better word than "focus" in that last sentence,
>
> Suggestions?
> I have antipenumbrify, but that is probably not at the top of your
list.

locus

Tom Petch


>
> > but, even if we can't, this addresses the blocking portion of my
comments.
>
> Change not yet made.
> I'm just letting this soak in case the WG comments.
>
> A
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls


From nobody Tue Nov 25 02:55:26 2014
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Subject: Re: [mpls] Pete Resnick's Block on charter-ietf-mpls-06-04: (with BLOCK and COMMENT)
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All changes made. Time to clear, Pete?

A

> -----Original Message-----
> From: Loa Andersson [mailto:loa@pi.nu]
> Sent: 25 November 2014 01:58
> To: adrian@olddog.co.uk; 'Pete Resnick'; 'The IESG'
> Cc: mpls@ietf.org; mpls-chairs@tools.ietf.org
> Subject: Re: Pete Resnick's Block on charter-ietf-mpls-06-04: (with BLOCK and
> COMMENT)
> 
> Adrian,
> 
> possibly nit picking, but ...
> 
> On 2014-11-25 01:00, Adrian Farrel wrote:
> > I had some discussion with Pete about this on jabber.
> > The problem comes because it appears from the first sentence that the MPLS
> WG might be making decisions and documenting them outside the responsibility
> of TEAS to act as the focus for coordination.
> > Therefore, I propose the following modification...
> >
> >    - Coordinate the work on RSVP-TE with CCAMP and TEAS. In the cases
> >      where there is an overlap, generic parts will be done by the TEAS
> >      working group, MPLS data plane specific parts will be done by the
> >      MPLS working group, and support for any other specific data planes
> >      will be done by the CCAMP working group. The TEAS working group acts
> >      as the focus for coordinating this work, and the MPLS working group
> 
> OLD
> >      will note agreements about work to be done in this working group
> >      through milestones in this charter.
> 
> NEW
>         will track agreements about work to be done by the MPLS working
>         group as milestones in the working group charter.
> 
> /Loa
> >
> > Adrian
> >
> 
> --
> 
> 
> Loa Andersson                        email: loa@mail01.huawei.com
> Senior MPLS Expert                          loa@pi.nu
> Huawei Technologies (consultant)     phone: +46 739 81 21 64


From nobody Tue Nov 25 05:39:03 2014
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From: "Benoit Claise" <bclaise@cisco.com>
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Subject: [mpls] Benoit Claise's No Objection on charter-ietf-mpls-06-06: (with COMMENT)
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Benoit Claise has entered the following ballot position for
charter-ietf-mpls-06-06: No Objection

When responding, please keep the subject line intact and reply to all
email addresses included in the To and CC lines. (Feel free to cut this
introductory paragraph, however.)



The document, along with other ballot positions, can be found here:
http://datatracker.ietf.org/doc/charter-ietf-mpls/



----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Same remark as for the TEAS charter.

OLD:
- Define YANG models and MIB modules for MPLS working group related
  solutions. Coordinate with the LIME and NETMOD working groups for
  core YANG models.

NEW:
- Data models (YANG and MIB modules may be considered.) for MPLS 
  working group related solutions. Coordinate with the LIME and NETMOD 
  working groups for core YANG models.



From nobody Tue Nov 25 05:44:57 2014
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Text change made
A

> -----Original Message-----
> From: iesg [mailto:iesg-bounces@ietf.org] On Behalf Of Benoit Claise
> Sent: 25 November 2014 13:39
> To: The IESG
> Cc: mpls@ietf.org; mpls-chairs@tools.ietf.org
> Subject: Benoit Claise's No Objection on charter-ietf-mpls-06-06: (with
> COMMENT)
> 
> Benoit Claise has entered the following ballot position for
> charter-ietf-mpls-06-06: No Objection
> 
> When responding, please keep the subject line intact and reply to all
> email addresses included in the To and CC lines. (Feel free to cut this
> introductory paragraph, however.)
> 
> 
> 
> The document, along with other ballot positions, can be found here:
> http://datatracker.ietf.org/doc/charter-ietf-mpls/
> 
> 
> 
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
> 
> Same remark as for the TEAS charter.
> 
> OLD:
> - Define YANG models and MIB modules for MPLS working group related
>   solutions. Coordinate with the LIME and NETMOD working groups for
>   core YANG models.
> 
> NEW:
> - Data models (YANG and MIB modules may be considered.) for MPLS
>   working group related solutions. Coordinate with the LIME and NETMOD
>   working groups for core YANG models.



From nobody Tue Nov 25 08:24:49 2014
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Pete Resnick has entered the following ballot position for
charter-ietf-mpls-06-07: No Objection

When responding, please keep the subject line intact and reply to all
email addresses included in the To and CC lines. (Feel free to cut this
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The document, along with other ballot positions, can be found here:
http://datatracker.ietf.org/doc/charter-ietf-mpls/



----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Some bits I think should be clarified, but can wait until external
review:

   The working group's responsibilities include procedures and protocols
   
What do you mean by "procedures"? Operational guidance?
   
   - Determine MPLS-specific aspects of traffic engineering including
     for multi-areas/multi-AS scenarios in cooperation with the TEAS 
     working group.

As with the CCAMP charter, I'm a bit mystified by the word "Determine"
here. What exactly does the WG do on this point?



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On 11/25/14 4:55 AM, Adrian Farrel wrote:
> All changes made. Time to clear, Pete?
>    

As soon as I was awake and at the keyboard. Done.

pr

-- 
Pete Resnick<http://www.qualcomm.com/~presnick/>
Qualcomm Technologies, Inc. - +1 (858)651-4478


From nobody Tue Nov 25 13:29:57 2014
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The Multiprotocol Label Switching (mpls) working group in the Routing
Area of the IETF is undergoing rechartering. The IESG has not made any
determination yet. The following draft charter was submitted, and is
provided for informational purposes only. Please send your comments to
the IESG mailing list (iesg at ietf.org) by 2014-12-02.

Multiprotocol Label Switching (mpls)
------------------------------------------------
Current Status: Active WG

Chairs:
  Loa Andersson <loa@pi.nu>
  George Swallow <swallow@cisco.com>
  Ross Callon <rcallon@juniper.net>

Secretaries:
  Martin Vigoureux <martin.vigoureux@alcatel-lucent.com>

Assigned Area Director:
  Adrian Farrel <adrian@olddog.co.uk>

Mailing list
  Address: mpls@ietf.org
  To Subscribe: https://www.ietf.org/mailman/listinfo/mpls
  Archive: http://www.ietf.org/mail-archive/web/mpls/

Charter:

The MPLS working group is responsible for standardizing 
technology for label switching and for the implementation of
label-switched paths over packet based link-level 
technologies.

The working group's responsibilities include procedures and 
protocols for the distribution of labels between Label Switching
Routers (LSRs), MPLS packet encapsulation, and for Operation,
Administration, and Maintenance (OAM) including the necessary 
management objects expressed as YANG models or MIB modules.

The current WG focus areas and work items are: 

- Maintain existing MPLS requirements, mechanisms, and protocols,
  as currently documented in RFCs, in coordination with other 
  working groups that work in overlapping areas including the
  BESS, BFD, CCAMP, OPSAWG, PALS, SPRING, and TEAS
  working groups.

- Evolve key MPLS protocols, including LDP, tLDP, mLDP, RSVP-TE
  for packet networks, and LSP Ping to meet new requirements.

- Document MPLS-specific aspects of traffic engineering including
  for multi-areas/multi-AS scenarios in cooperation with the TEAS 
  working group.

- Coordinate the work on RSVP-TE with CCAMP and TEAS. In the cases
  where there is an overlap, generic parts will be done by the TEAS
  working group, MPLS data plane specific parts will be done by the
  MPLS working group, and support for any other specific data planes
  will be done by the CCAMP working group. The TEAS working group acts
  as the hub for coordinating this work, and the MPLS working group 
  will track agreements about work to be done in this working group
  through milestones in this charter.

- Define data models for MPLS working group related solutions.
  YANG models and MIB modules may be considered. Coordinate with
  the LIME and NETMOD working groups for core YANG models.

- Define an overall OAM framework for topology-driven, traffic
  engineered, and transport profile MPLS applications.

- Define the necessary extensions for MPLS key protocols for dual-
  stack and IPv6-only networks.

- Document current implementation practices for MPLS load sharing.

- Document mechanisms for securing MPLS protocols and data plane.

- Document mechanisms for adding multi-topology support to existing
  MPLS protocols.

- Define the necessary protection protocols and scenarios for transport
  profile MPLS applications

- Document use cases for MPLS protocols.

Milestones:

TBD


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From: Ronald Bonica <rbonica@juniper.net>
To: Sam Aldrin <aldrin.ietf@gmail.com>
Thread-Topic: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Date: Tue, 25 Nov 2014 15:56:10 -0800
Message-ID: <CA+C0YO3vsr8PHEsrTNd8x-ikXKUG5ADDm=pesPC3K7_RYLJCUQ@mail.gmail.com>
From: Sam Aldrin <aldrin.ietf@gmail.com>
To: Ronald Bonica <rbonica@juniper.net>
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Cc: "mpls@ietf.org" <mpls@ietf.org>
Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Hi Ron,

Thanks for the reply.

[sorry for the top post]

Glad that we are on the same page.
Now that we are clear that this ID is not related to RFC4379 but borrows
the model and format of packet structure, etc, I do not have a problem as
such, provided the draft text is worded that way.
Not just for the reasoning purposes, but adds clarity to what you intend to
do and not confuse readers with LSP ping.
W.r.t. Request / Reply, I prefer to have new terms defined and identify
them in the terminology section. For ex: 'Self Ping Message' or something
else.

RFC4379 may not define different message formats for Echo Request and Echo
Reply, it clearly identifies those message types.

cheers
-sam


On Tue, Nov 25, 2014 at 3:28 PM, Ronald Bonica <rbonica@juniper.net> wrote:

>  Sam and Carlos,
>
>
>
> You are correct in that LSP Self-ping has very little to do with LSP Ping
> [RFC 4379]. In fact, aside from borrowing the message format, it has *
> *nothing** to do with RFC 4379]!
>
>
>
> Rationale follows:
>
>
>
> -          LSP Self-ping messages do not carry the router alert message
>
> -          Transit and egress LSRs don=E2=80=99t examine or process LSP P=
ing
> messages; they simply forward them
>
> -          Only the ingress LSR listens for LSP Self Ping messages
>
> -          The ingress LSR listens for LSP Self Ping messages on a
> different port than it listens for LSP Ping messages
>
> -          The ingess LSR never responds to an LSP Self Ping message.
>
>
>
> I will make this explicit in the next version of the draft.
>
>
>
> Sam,
>
>
>
> You raise another point that Loa also raised in his chairs review. RFC
> 4379 does not specify Echo Request and Echo Reply messages. It specifies =
a
> single Echo message with a Message Type field (request or reply). In
> draft-bonica-mpls-self-ping, I retain that terminology. However, Loa
> suggests that I refer to an Echo Reply message for clarity. I tend to agr=
ee
> with Loa. What do you think?
>
>
>
>
> Ron
>
>
>
> *From:* Sam Aldrin [mailto:aldrin.ietf@gmail.com]
> *Sent:* Tuesday, November 25, 2014 3:49 AM
> *To:* Ronald Bonica
> *Cc:* Shah, Himanshu; Nobo Akiya (nobo); Shahram Davari; Thomas Nadeau;
> mpls@ietf.org
>
> *Subject:* Re: [mpls] draft-bonica-mpls-self-ping: Response to comments
> from the mike
>
>
>
> Ron,
>
>
>
> I do not think the reason specifying it as LSP ping is correct.
>
> Although you are using LSP ping Echo reply like packet format, it is not
> LSP ping packet as it doesn't confirm to RFC4379.
>
> For ex: MPLS Echo Reply is only sent when MPLS Echo Request is received.
> Neither does it detect any dataplane failures, which is the title of the
> RFC.
>
>
>
> Hence, I am not convinced that this ID warrants informational RFC, which
> is based on RFC4379.
>
>
>
> But if you want to keep the ID out side the perview of RFC4379, then it
> should be updated accordingly and discussion should be on those lines.
>
>
>
> cheers
>
> -sam
>
>  On Nov 21, 2014, at 2:19 PM, Ronald Bonica <rbonica@juniper.net> wrote:
>
>
>
> Shah,
>
>
>
> Because there are no interoperability implications, there is no need for =
a
> standards track RFC. However, because LSP Ping sends traffic off-box, an
> INFORMATIONAL RFC is appropriate. LSP Ping traffic might be detected by
> counters, intrusion detection devices and firewalls. We should document a=
ll
> of the OAM traffic that we generate.
>
>
>
>                                    Ron
>
>
>
>
>
> *From:* Shah, Himanshu [mailto:hshah@ciena.com <hshah@ciena.com>]
> *Sent:* Thursday, November 20, 2014 7:05 PM
> *To:* Nobo Akiya (nobo); Sam Aldrin; Shahram Davari
> *Cc:* Thomas Nadeau; Ronald Bonica; mpls@ietf.org
> *Subject:* RE: [mpls] draft-bonica-mpls-self-ping: Response to comments
> from the mike
>
>
>
> *Understand documenting helpful techniques (more useful during
> restoration/re-optimization cases) as informational RFC, but I believe IE=
TF
> usually*
>
> *entertains proposals which has interoperability implications, AFAIK.*
>
>
>
> *Which is what others are saying as well=E2=80=A6*
>
>
>
> *Thanks,*
>
> *himanshu*
>
>
>
> *From:* Nobo Akiya (nobo) [mailto:nobo@cisco.com <nobo@cisco.com>]
> *Sent:* Thursday, November 20, 2014 6:23 PM
> *To:* Sam Aldrin; Shahram Davari
> *Cc:* Shah, Himanshu; Thomas Nadeau; Ronald Bonica; mpls@ietf.org
> *Subject:* RE: [mpls] draft-bonica-mpls-self-ping: Response to comments
> from the mike
>
>
>
> Thanks for not shooting me Sam but I=E2=80=99m really not the messenger J
>
>
>
> If there is a good proposal that covers set of LSP types with [virtually]
> no imitations, then documenting such proposal has an value, IMHO.
>
>
>
> I=E2=80=99d agree that current contents of this document may not provide
> sufficient value to be pursued as an informational document, but I=E2=80=
=99m not
> hopeless that something could come out of this.
>
>
>
> Thanks!
>
>
>
> -Nobo
>
>
>
> *From:* Sam Aldrin [mailto:aldrin.ietf@gmail.com <aldrin.ietf@gmail.com>]
> *Sent:* Thursday, November 20, 2014 2:57 PM
> *To:* Shahram Davari
> *Cc:* Nobo Akiya (nobo); Shah, Himanshu; Thomas Nadeau; Ronald Bonica;
> mpls@ietf.org
> *Subject:* Re: [mpls] draft-bonica-mpls-self-ping: Response to comments
> from the mike
>
>
>
> Hi Nobo,
>
>
>
> [without shooting the messenger]
>
>
>
> In addition to what you listed, would like to see details on how  this ID
> will improve the performance at Egress should be clarified.
>
> i.e. IP routing Vs OAM process (w/o FEC validation). Also, how this model
> helps if reverse IP path is not available (inter-domain, reverse path
> broken, non-routable ingress IP address) and to what gain?
>
>
>
> There are many ways the LSP ping is being used, both as proprietary and
> also part of eco system.
>
> If we go by the logic that this ID is needed, we will have slew of new
> ID=E2=80=99s detailing different usage models.
>
>
>
> Hence, I totally agree with what Shahram and others have indicated.
>
>
>
> -sam
>
>
>
>  On Nov 20, 2014, at 11:15 AM, Shahram Davari <davari@broadcom.com> wrote=
:
>
>
>
> Hi,
>
>
> Since the procedures in this draft generates and processes the test
> packets on the same router and since other routers just forward normally,
>  why do we even need a draft? There is no interoperability requirements,
> and each vendor can implement what they like.
>
>
>
> Thanks
>
> Shahram
>
>
>
> *From:* mpls [mailto:mpls-bounces@ietf.org <mpls-bounces@ietf.org>] *On
> Behalf Of *Nobo Akiya (nobo)
> *Sent:* Thursday, November 20, 2014 10:57 AM
> *To:* Shah, Himanshu; Thomas D. Nadeau; Sam Aldrin
> *Cc:* Ronald Bonica; mpls@ietf.org
> *Subject:* Re: [mpls] draft-bonica-mpls-self-ping: Response to comments
> from the mike
>
>
>
> Hi,
>
>
>
> Sort of summarizing what=E2=80=99s been stated but here=E2=80=99s my obse=
rvation of
> draft-bonica-mpls-self-ping.
>
>
>
> 1.       LSP Ping and BFD MPLS already do what is being proposed.
>
> 2.       Ron needs a mechanism that is more efficient on egress LSRs,
> with respect to resources and operational aspects.
>
> 3.       Any probe packet having destination IP address as the ingress
> LSR has limitations in terms of how effective it can verify the DP
> readiness.
>
> 4.       The proposal by Ron is limited to those LSPs that signal via
> ordered mode (ex: LDP independent mode will not work) - same problem as (=
3).
>
>
>
> If the intent of draft-bonica-mpls-self-ping is just to document what has
> been implemented or what is being implemented, I=E2=80=99d like to reques=
t
> followings to be captured in the document.
>
> -          limitations (3 and 4) so that readers are aware of them.
>
> -          usage of non-127/8 address as destination IP address in MPLS
> echo request/reply deviates from RFC4379.
>
>
>
> If the intent of draft-bonica-mpls-self-ping is to advocate a mechanism
> for efficient MPLS DP readiness test, and I=E2=80=99d like to request tha=
t:
>
> -          requirements (2) are well captured.
>
> -          S-BFD be evaluated (as it addresses the efficiency
> requirements and does not have limitations described by 3 and 4).
>
>
>
> Himanshu, I have one comment in-line below. Please look for [NOBO].
>
>
>
>
>
> *From:* mpls [mailto:mpls-bounces@ietf.org <mpls-bounces@ietf.org>] *On
> Behalf Of *Shah, Himanshu
> *Sent:* Thursday, November 20, 2014 10:36 AM
> *To:* Thomas D. Nadeau; Sam Aldrin
> *Cc:* Ronald Bonica; mpls@ietf.org
> *Subject:* Re: [mpls] draft-bonica-mpls-self-ping: Response to comments
> from the mike
>
>
>
> *This is exactly what I said at Mic.*
>
> *We have been deploying MPLS for a while and if such DP active
> verification was necessary, vendors have solved it without*
>
> *standard specific solution, may that be BFD or self-ping.*
>
>
>
> *One of the argument made was that client BFD session detects that =E2=80=
=9Ctunnel
> is active but DP is not=E2=80=9D.*
>
> *Does it imply there is some kind of UNI signaling going on between PE an=
d
> CE to indicate that tunnel has become*
>
> *active, commence data? And the idea is that PE will refrain notification
> until self-ping verify DP active?*
>
>
>
> *If that is not the case then this technique is not even useful =E2=80=93=
 self
> ping is not actually causing the DP to become active,*
>
> *If it doesn=E2=80=99t become active in the time window, what is PE going=
 to do?*
>
>
>
> [NOBO] That is another interesting aspect of the whole solution. However,
> I believe that the problem scope of this document is much smaller: ingres=
s
> LSR to detect readiness of RSVP signaled LSP. For RSVP signaled LSP, only
> the LSP that is =E2=80=9Cpassing the test=E2=80=9D can be tied to the tun=
nel as the active
> LSP, so at least the ingress LSR will not pump traffic into the tunnel
> without knowing whether DP end-to-end is ready or not. Assuming that ther=
e
> are other ways to get to the egress LSR from this ingress LSR, then the
> problem is solved. Otherwise the ingress LSR will drop the traffic but th=
e
> problem is contained to that network node (i.e. packets are not traversin=
g
> un-ready LSP).
>
>
>
> Thanks!
>
>
>
> -Nobo
>
>
>
>
>
> */himanshu*
>
>
>
> *From:* mpls [mailto:mpls-bounces@ietf.org <mpls-bounces@ietf.org>] *On
> Behalf Of *Thomas D. Nadeau
> *Sent:* Thursday, November 20, 2014 9:43 AM
> *To:* Sam Aldrin
> *Cc:* Ronald Bonica; mpls@ietf.org
> *Subject:* Re: [mpls] draft-bonica-mpls-self-ping: Response to comments
> from the mike
>
>
>
>
>
>             To me what is described in the draft seems like this is a
> description of a device/vendor feature that automates the basic procedure=
s
> of 4379/etc.. This can and has been done for quite some time using other
> means such as onboard automated scripts/actions after paths are
> established/signaled. I say this not to be glib, but because I built such=
 a
> thing about 10 years ago that has been deployed widely.  Also, as Sam say=
s,
> there is some deviation from RFC4379 which we should ask is worth the
> additional complication (and required implementation + associated
> delay/etc...) versus just using the existing means.
>
>
>
>             The bottom line is that we should be asking ourselves whether
> or not this something we really need to standardize.
>
>
>
>             =E2=80=94Tom
>
>
>
>
>
>
>
>   On Nov 19, 2014:10:28 PM, at 10:28 PM, Sam Aldrin <aldrin.ietf@gmail.co=
m>
> wrote:
>
>
>
> Hi Ron,
>
>
>
> Still trying to understand the need for the draft, hence, have few of
> questions and need clarifications. Appreciate your response in advance.
>
>
>
> 1. (clarification q) The Ingress LSR sends the Echo request, with
> destination IP address to self, and forwards to Egress LSR (sec 2),
> correct?  Is this the only thing which identifies the Ingress LSR or
> something else too?
>
> 2. What happens if there is LSP breakage or something and the Echo reques=
t
> ends up on transit LSR? Doesn't it process? I see that draft says, this
> will avoid control plane processing. How so? The packet is forwarded from
> ingress to egress, which means, the egress will have to process the packe=
t
> i.e. look up the ip address to send it back to ingress.
>
>
>
> Draft says "The egress LSR forwards the MPLS Echo message to its
> destination, the
>
>    ingress LSR.  The egress LSR forwards the MPLS Echo message exactly
>
>    as it would forward any other packet."
>
>
>
> Could you explain, how egress forwards the packet back to ingress w/o loo=
king up the packet IP header i.e. in the data plane and no additional contr=
ol plane of OAM process?
>
>   3. Is the assertion that, if Echo Reply is received back at the ingress
> then it is failure, rather it should receive Echo Request back at Ingress=
,
> correct?
>
> 4. Why can't you use LSP proxy ping to self via Egress?
>
>
>
> Will followup with additional questions, if any, based on your responses.
>
>
>
> cheers
>
> -sam
>
>
>
>   On Nov 19, 2014, at 8:38 AM, Ronald Bonica <rbonica@juniper.net> wrote:
>
>
>
> Folks
>
> At IETF 91, the following points were raised with regard to
> draft-bonica-mpls-self-ping:
>
> 1) Why not use BFD?
> 2) Self-ping does not diagnose FIB programming errors in which an LSR
> other than the egress de-encapsulates and forwards the packet.
> 3) How does Self ping verify a bidirectional LSP's readiness to carry
> traffic in both directions?
> 4) Why does MPLS Self ping use MPLS Echo packets, as opposed to ICMP echo
> packets or some other packet format?
>
> Responses follow:
>
> 1) Why not use BFD?
>
> Self Ping is an extremely light-weight protocol. A typical Self Ping
> session emits one or two packets and terminates less than one second afte=
r
> initiation. Self-ping requires no configuration or control plane resource=
s
> on the egress LSR.
>
> By contrast, BFD is designed to verify bi-directional connectivity over a
> longer period of time. Therefore, MPLS Self Ping is appropriate in
> environments where BFD is too resource intensive.
>
> 2) Self-ping does not diagnose programming errors in which an LSR other
> than the egress de-encapsulates and forwards the packet.
>
> Self Ping is designed to verify LSP readiness without consuming control
> plane resources on the egress router. It is not designed to diagnose
> programming errors in which an LSR other than the egress de-encapsulates
> and forwards the packet. Mechanisms that diagnose such issues are availab=
le
> [RFC 4950]. However, they are more resource intensive.
>
> 3) How does Self ping verify a bidirectional LSP's readiness to carry
> traffic in both directions?
>
> In order to verify bidirectional LSP readiness, RSVP instantiates two LSP
> Self Ping sessions, one at each end of the LSP. The LSR at one end of the
> LSP initiates a self ping session when it receives a RESV message. The LS=
R
> at the other end of the LSP initiates a Self Ping Session when it sends a
> RESV message. Each LSP endpoint forwards traffic over the LSP only after
> the LSP Self Ping session terminates successfully
>
> 4) Why does LSP Self Ping use MPLS Echo packets, as opposed to some other
> packet format?
>
> LSP Self Ping could have used many packet formats. The only hard
> requirement was to have one 64-bit field in which the 64 bit session
> identifier could be encoded. The MPLS Echo packet was convenient because
> its Senders Handle is 64-bits long.
>
> I will update the draft to reflect this information.
>
> Ron Bonica
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>
>
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>
>
>

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<div dir=3D"ltr">Hi Ron,<div><br></div><div>Thanks for the reply.</div><div=
><br></div><div>[sorry for the top post]</div><div><br></div><div>Glad that=
 we are on the same page.=C2=A0</div><div>Now that we are clear that this I=
D is not related to RFC4379 but borrows the model and format of packet stru=
cture, etc, I do not have a problem as such, provided the draft text is wor=
ded that way.</div><div>Not just for the reasoning purposes, but adds clari=
ty to what you intend to do and not confuse readers with LSP ping.</div><di=
v>W.r.t. Request / Reply, I prefer to have new terms defined and identify t=
hem in the terminology section. For ex: &#39;Self Ping Message&#39; or some=
thing else.</div><div><br></div><div>RFC4379 may not define different messa=
ge formats for Echo Request and Echo Reply, it clearly identifies those mes=
sage types.</div><div><br></div><div>cheers</div><div>-sam</div><div><br></=
div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Tue,=
 Nov 25, 2014 at 3:28 PM, Ronald Bonica <span dir=3D"ltr">&lt;<a href=3D"ma=
ilto:rbonica@juniper.net" target=3D"_blank">rbonica@juniper.net</a>&gt;</sp=
an> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;=
border-left:1px #ccc solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Sam and Carlos,<u></u><u></u></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">You are correct in that LSP Self-ping=
 has very little to do with LSP Ping [RFC 4379]. In fact, aside from borrow=
ing the message format, it has *<b>nothing</b>*
 to do with RFC 4379]! <u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Rationale follows:<u></u><u></u></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p><u></u><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,s=
ans-serif;color:#1f497d"><span>-<span style=3D"font:7.0pt &quot;Times New R=
oman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span style=3D"font-size:11.0pt;font-family:&qu=
ot;Calibri&quot;,sans-serif;color:#1f497d">LSP Self-ping messages do not ca=
rry the router alert message<u></u><u></u></span></p>
<p><u></u><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,s=
ans-serif;color:#1f497d"><span>-<span style=3D"font:7.0pt &quot;Times New R=
oman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span style=3D"font-size:11.0pt;font-family:&qu=
ot;Calibri&quot;,sans-serif;color:#1f497d">Transit and egress LSRs don=E2=
=80=99t examine or process LSP Ping messages; they simply forward them<u></=
u><u></u></span></p>
<p><u></u><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,s=
ans-serif;color:#1f497d"><span>-<span style=3D"font:7.0pt &quot;Times New R=
oman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span style=3D"font-size:11.0pt;font-family:&qu=
ot;Calibri&quot;,sans-serif;color:#1f497d">Only the ingress LSR listens for=
 LSP Self Ping messages<u></u><u></u></span></p>
<p><u></u><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,s=
ans-serif;color:#1f497d"><span>-<span style=3D"font:7.0pt &quot;Times New R=
oman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span style=3D"font-size:11.0pt;font-family:&qu=
ot;Calibri&quot;,sans-serif;color:#1f497d">The ingress LSR listens for LSP =
Self Ping messages on a different port than it listens for LSP Ping message=
s<u></u><u></u></span></p>
<p><u></u><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,s=
ans-serif;color:#1f497d"><span>-<span style=3D"font:7.0pt &quot;Times New R=
oman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span style=3D"font-size:11.0pt;font-family:&qu=
ot;Calibri&quot;,sans-serif;color:#1f497d">The ingess LSR never responds to=
 an LSP Self Ping message.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">I will make this explicit in the next=
 version of the draft.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Sam,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">You raise another point that Loa also=
 raised in his chairs review. RFC 4379 does not specify Echo Request and Ec=
ho Reply messages. It specifies a single Echo
 message with a Message Type field (request or reply). In draft-bonica-mpls=
-self-ping, I retain that terminology. However, Loa suggests that I refer t=
o an Echo Reply message for clarity. I tend to agree with Loa. What do you =
think?<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 Ron<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif"> Sam Aldrin [mailto:<a href=3D"=
mailto:aldrin.ietf@gmail.com" target=3D"_blank">aldrin.ietf@gmail.com</a>]
<br>
<b>Sent:</b> Tuesday, November 25, 2014 3:49 AM<br>
<b>To:</b> Ronald Bonica<br>
<b>Cc:</b> Shah, Himanshu; Nobo Akiya (nobo); Shahram Davari; Thomas Nadeau=
; <a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a></spa=
n></p><div><div class=3D"h5"><br>
<b>Subject:</b> Re: [mpls] draft-bonica-mpls-self-ping: Response to comment=
s from the mike<u></u><u></u></div></div><p></p>
</div>
</div><div><div class=3D"h5">
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Ron,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">I do not think the reason specifying it as LSP ping =
is correct.=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Although you are using LSP ping Echo reply like pack=
et format, it is not LSP ping packet as it doesn&#39;t confirm to RFC4379.<=
u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">For ex: MPLS Echo Reply is only sent when MPLS Echo =
Request is received. Neither does it detect any dataplane failures, which i=
s the title of the RFC.=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Hence, I am not convinced that this ID warrants info=
rmational RFC, which is based on RFC4379.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">But if you want to keep the ID out side the perview =
of RFC4379, then it should be updated accordingly and discussion should be =
on those lines.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">cheers<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">-sam<u></u><u></u></p>
<div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal">On Nov 21, 2014, at 2:19 PM, Ronald Bonica &lt;<a hr=
ef=3D"mailto:rbonica@juniper.net" target=3D"_blank">rbonica@juniper.net</a>=
&gt; wrote:<u></u><u></u></p>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Shah,</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Because there are no interoperability=
 implications, there is no need for a standards track RFC. However, because=
 LSP Ping sends traffic off-box, an INFORMATIONAL
 RFC is appropriate. LSP Ping traffic might be detected by counters, intrus=
ion detection devices and firewalls. We should document all of the OAM traf=
fic that we generate.</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 Ron</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
</div>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in =
0in 0in">
<div>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,sans-serif">From:</span></b><span><span style=3D"font-size:1=
1.0pt;font-family:&quot;Calibri&quot;,sans-serif">=C2=A0</span></span><span=
 style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Shah=
,
 Himanshu [<a href=3D"mailto:hshah@ciena.com" target=3D"_blank">mailto:hsha=
h@ciena.com</a>]<span>=C2=A0</span><br>
<b>Sent:</b><span>=C2=A0</span>Thursday, November 20, 2014 7:05 PM<br>
<b>To:</b><span>=C2=A0</span>Nobo Akiya (nobo); Sam Aldrin; Shahram Davari<=
br>
<b>Cc:</b><span>=C2=A0</span>Thomas Nadeau; Ronald Bonica;
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<b>Subject:</b><span>=C2=A0</span>RE: [mpls] draft-bonica-mpls-self-ping: R=
esponse to comments from the mike</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Cambria&quot;,serif;color:#0040c0">Understand documenting helpful techniqu=
es (more useful during restoration/re-optimization cases) as informational =
RFC, but I believe IETF usually</span></i><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Cambria&quot;,serif;color:#0040c0">entertains proposals which has interope=
rability implications, AFAIK.</span></i><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Cambria&quot;,serif;color:#0040c0">=C2=A0</span></i><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Cambria&quot;,serif;color:#0040c0">Which is what others are saying as well=
=E2=80=A6</span></i><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Cambria&quot;,serif;color:#0040c0">=C2=A0</span></i><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Cambria&quot;,serif;color:#0040c0">Thanks,</span></i><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Cambria&quot;,serif;color:#0040c0">himanshu</span></i><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Cambria&quot;,serif;color:#0040c0">=C2=A0</span></i><u></u><u></u></p>
</div>
<div>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in =
0in 0in">
<div>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,sans-serif">From:</span></b><span><span style=3D"font-size:10=
.0pt;font-family:&quot;Tahoma&quot;,sans-serif">=C2=A0</span></span><span s=
tyle=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif">Nobo
 Akiya (nobo) [<a href=3D"mailto:nobo@cisco.com" target=3D"_blank"><span st=
yle=3D"color:purple">mailto:nobo@cisco.com</span></a>]<span>=C2=A0</span><b=
r>
<b>Sent:</b><span>=C2=A0</span>Thursday, November 20, 2014 6:23 PM<br>
<b>To:</b><span>=C2=A0</span>Sam Aldrin; Shahram Davari<br>
<b>Cc:</b><span>=C2=A0</span>Shah, Himanshu; Thomas Nadeau; Ronald Bonica;<=
span>=C2=A0</span><a href=3D"mailto:mpls@ietf.org" target=3D"_blank"><span =
style=3D"color:purple">mpls@ietf.org</span></a><br>
<b>Subject:</b><span>=C2=A0</span>RE: [mpls] draft-bonica-mpls-self-ping: R=
esponse to comments from the mike</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Thanks for not shootin=
g me Sam but I=E2=80=99m really not the messenger<span>=C2=A0</span></span>=
<span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-family:Wingdings;color:=
#1f497d">J</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">If there is a good pro=
posal that covers set of LSP types with [virtually] no imitations, then doc=
umenting such proposal has an value, IMHO.</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">I=E2=80=99d agree that=
 current contents of this document may not provide sufficient value to be p=
ursued as an informational document, but I=E2=80=99m not hopeless
 that something could come out of this.</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Thanks!</span><u></u><=
u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">-Nobo</span><u></u><u>=
</u></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
</div>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in =
0in 0in">
<div>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,sans-serif">From:</span></b><span><span style=3D"font-size:10=
.0pt;font-family:&quot;Tahoma&quot;,sans-serif">=C2=A0</span></span><span s=
tyle=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif">Sam
 Aldrin [<a href=3D"mailto:aldrin.ietf@gmail.com" target=3D"_blank"><span s=
tyle=3D"color:purple">mailto:aldrin.ietf@gmail.com</span></a>]<span>=C2=A0<=
/span><br>
<b>Sent:</b><span>=C2=A0</span>Thursday, November 20, 2014 2:57 PM<br>
<b>To:</b><span>=C2=A0</span>Shahram Davari<br>
<b>Cc:</b><span>=C2=A0</span>Nobo Akiya (nobo); Shah, Himanshu; Thomas Nade=
au; Ronald Bonica;<span>=C2=A0</span><a href=3D"mailto:mpls@ietf.org" targe=
t=3D"_blank"><span style=3D"color:purple">mpls@ietf.org</span></a><br>
<b>Subject:</b><span>=C2=A0</span>Re: [mpls] draft-bonica-mpls-self-ping: R=
esponse to comments from the mike</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Hi Nobo,</span><u></u><u></u></=
p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">[without shooting the messenger=
]</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">In addition to what you listed,=
 would like to see details on how =C2=A0this ID will improve the performanc=
e at Egress should be clarified.</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">i.e. IP routing Vs OAM process =
(w/o FEC validation). Also, how this model helps if reverse IP path is not =
available (inter-domain, reverse path broken, non-routable ingress IP addre=
ss) and to what gain?</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">There are many ways the LSP pin=
g is being used, both as proprietary and also part of eco system.</span><u>=
</u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">If we go by the logic that this=
 ID is needed, we will have slew of new ID=E2=80=99s detailing different us=
age models.</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Hence, I totally agree with wha=
t Shahram and others have indicated.</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">-sam</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
<div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">On Nov 20, 2014, at 11:15 AM, S=
hahram Davari &lt;<a href=3D"mailto:davari@broadcom.com" target=3D"_blank">=
<span style=3D"color:purple">davari@broadcom.com</span></a>&gt; wrote:</spa=
n><u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Hi,</span><u></u><u></=
u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><br>
Since the procedures in this draft generates and processes the test packets=
 on the same router and since other routers just forward normally, =C2=A0wh=
y do we even need a draft? There is no interoperability requirements, and e=
ach vendor can implement what they like.</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Thanks</span><u></u><u=
></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Shahram</span><u></u><=
u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
</div>
</div>
<div>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in =
0in 0in">
<div>
<div>
<p class=3D"MsoNormal"><b><span lang=3D"EN-CA" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,sans-serif">From:</span></b><span><span lang=
=3D"EN-CA" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-se=
rif">=C2=A0</span></span><span lang=3D"EN-CA" style=3D"font-size:10.0pt;fon=
t-family:&quot;Tahoma&quot;,sans-serif">mpls
 [<a href=3D"mailto:mpls-bounces@ietf.org" target=3D"_blank"><span style=3D=
"color:purple">mailto:mpls-bounces@ietf.org</span></a>]<span>=C2=A0</span><=
b>On Behalf Of<span>=C2=A0</span></b>Nobo Akiya (nobo)<br>
<b>Sent:</b><span>=C2=A0</span>Thursday, November 20, 2014 10:57 AM<br>
<b>To:</b><span>=C2=A0</span>Shah, Himanshu; Thomas D. Nadeau; Sam Aldrin<b=
r>
<b>Cc:</b><span>=C2=A0</span>Ronald Bonica;<span>=C2=A0</span><a href=3D"ma=
ilto:mpls@ietf.org" target=3D"_blank"><span style=3D"color:purple">mpls@iet=
f.org</span></a><br>
<b>Subject:</b><span>=C2=A0</span>Re: [mpls] draft-bonica-mpls-self-ping: R=
esponse to comments from the mike</span><u></u><u></u></p>
</div>
</div>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Hi,</span><u></u><u></=
u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Sort of summarizing wh=
at=E2=80=99s been stated but here=E2=80=99s my observation of draft-bonica-=
mpls-self-ping.</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
</div>
</div>
<div style=3D"margin-left:.5in">
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">1.</span><span lang=3D=
"EN-CA" style=3D"font-size:7.0pt;color:#1f497d">=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0<span>=C2=A0</span></span><span lang=3D"EN-CA" style=3D"font-size:=
11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">LSP
 Ping and BFD MPLS already do what is being proposed.</span><u></u><u></u><=
/p>
</div>
</div>
<div style=3D"margin-left:.5in">
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">2.</span><span lang=3D=
"EN-CA" style=3D"font-size:7.0pt;color:#1f497d">=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0<span>=C2=A0</span></span><span lang=3D"EN-CA" style=3D"font-size:=
11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Ron
 needs a mechanism that is more efficient on egress LSRs, with respect to r=
esources and operational aspects.</span><u></u><u></u></p>
</div>
</div>
<div style=3D"margin-left:.5in">
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">3.</span><span lang=3D=
"EN-CA" style=3D"font-size:7.0pt;color:#1f497d">=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0<span>=C2=A0</span></span><span lang=3D"EN-CA" style=3D"font-size:=
11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Any
 probe packet having destination IP address as the ingress LSR has limitati=
ons in terms of how effective it can verify the DP readiness.</span><u></u>=
<u></u></p>
</div>
</div>
<div style=3D"margin-left:.5in">
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">4.</span><span lang=3D=
"EN-CA" style=3D"font-size:7.0pt;color:#1f497d">=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0<span>=C2=A0</span></span><span lang=3D"EN-CA" style=3D"font-size:=
11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">The
 proposal by Ron is limited to those LSPs that signal via ordered mode (ex:=
 LDP independent mode will not work) - same problem as (3).</span><u></u><u=
></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">If the intent of draft=
-bonica-mpls-self-ping is just to document what has been implemented or wha=
t is being implemented, I=E2=80=99d like to request followings
 to be captured in the document.</span><u></u><u></u></p>
</div>
</div>
<div style=3D"margin-left:.5in">
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">-</span><span lang=3D"=
EN-CA" style=3D"font-size:7.0pt;color:#1f497d">=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0<span>=C2=A0</span></span><span lang=3D"EN-CA" s=
tyle=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#=
1f497d">limitations
 (3 and 4) so that readers are aware of them.</span><u></u><u></u></p>
</div>
</div>
<div style=3D"margin-left:.5in">
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">-</span><span lang=3D"=
EN-CA" style=3D"font-size:7.0pt;color:#1f497d">=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0<span>=C2=A0</span></span><span lang=3D"EN-CA" s=
tyle=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#=
1f497d">usage
 of non-127/8 address as destination IP address in MPLS echo request/reply =
deviates from RFC4379.</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">If the intent of draft=
-bonica-mpls-self-ping is to advocate a mechanism for efficient MPLS DP rea=
diness test, and I=E2=80=99d like to request that:</span><u></u><u></u></p>
</div>
</div>
<div style=3D"margin-left:.5in">
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">-</span><span lang=3D"=
EN-CA" style=3D"font-size:7.0pt;color:#1f497d">=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0<span>=C2=A0</span></span><span lang=3D"EN-CA" s=
tyle=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#=
1f497d">requirements
 (2) are well captured.</span><u></u><u></u></p>
</div>
</div>
<div style=3D"margin-left:.5in">
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">-</span><span lang=3D"=
EN-CA" style=3D"font-size:7.0pt;color:#1f497d">=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0<span>=C2=A0</span></span><span lang=3D"EN-CA" s=
tyle=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#=
1f497d">S-BFD
 be evaluated (as it addresses the efficiency requirements and does not hav=
e limitations described by 3 and 4).</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Himanshu, I have one c=
omment in-line below. Please look for [NOBO].</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
</div>
</div>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in =
0in 0in">
<div>
<div>
<p class=3D"MsoNormal"><b><span lang=3D"EN-CA" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,sans-serif">From:</span></b><span><span lang=
=3D"EN-CA" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-se=
rif">=C2=A0</span></span><span lang=3D"EN-CA" style=3D"font-size:10.0pt;fon=
t-family:&quot;Tahoma&quot;,sans-serif">mpls
 [<a href=3D"mailto:mpls-bounces@ietf.org" target=3D"_blank"><span style=3D=
"color:purple">mailto:mpls-bounces@ietf.org</span></a>]<span>=C2=A0</span><=
b>On Behalf Of<span>=C2=A0</span></b>Shah, Himanshu<br>
<b>Sent:</b><span>=C2=A0</span>Thursday, November 20, 2014 10:36 AM<br>
<b>To:</b><span>=C2=A0</span>Thomas D. Nadeau; Sam Aldrin<br>
<b>Cc:</b><span>=C2=A0</span>Ronald Bonica;<span>=C2=A0</span><a href=3D"ma=
ilto:mpls@ietf.org" target=3D"_blank"><span style=3D"color:purple">mpls@iet=
f.org</span></a><br>
<b>Subject:</b><span>=C2=A0</span>Re: [mpls] draft-bonica-mpls-self-ping: R=
esponse to comments from the mike</span><u></u><u></u></p>
</div>
</div>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><i><span lang=3D"EN-CA" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Cambria&quot;,serif;color:#0040c0">This is exactly what I s=
aid at Mic.</span></i><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><i><span lang=3D"EN-CA" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Cambria&quot;,serif;color:#0040c0">We have been deploying M=
PLS for a while and if such DP active verification was necessary, vendors h=
ave solved it without</span></i><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><i><span lang=3D"EN-CA" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Cambria&quot;,serif;color:#0040c0">standard specific soluti=
on, may that be BFD or self-ping.</span></i><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><i><span lang=3D"EN-CA" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Cambria&quot;,serif;color:#0040c0">=C2=A0</span></i><u></u>=
<u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><i><span lang=3D"EN-CA" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Cambria&quot;,serif;color:#0040c0">One of the argument made=
 was that client BFD session detects that =E2=80=9Ctunnel is active but DP =
is not=E2=80=9D.</span></i><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><i><span lang=3D"EN-CA" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Cambria&quot;,serif;color:#0040c0">Does it imply there is s=
ome kind of UNI signaling going on between PE and CE to indicate that tunne=
l has become</span></i><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><i><span lang=3D"EN-CA" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Cambria&quot;,serif;color:#0040c0">active, commence data? A=
nd the idea is that PE will refrain notification until self-ping verify DP =
active?</span></i><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><i><span lang=3D"EN-CA" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Cambria&quot;,serif;color:#0040c0">=C2=A0</span></i><u></u>=
<u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><i><span lang=3D"EN-CA" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Cambria&quot;,serif;color:#0040c0">If that is not the case =
then this technique is not even useful =E2=80=93 self ping is not actually =
causing the DP to become active,</span></i><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><i><span lang=3D"EN-CA" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Cambria&quot;,serif;color:#0040c0">If it doesn=E2=80=99t be=
come active in the time window, what is PE going to do?</span></i><u></u><u=
></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><i><span lang=3D"EN-CA" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Cambria&quot;,serif;color:#1f497d">=C2=A0</span></i><u></u>=
<u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">[NOBO] That is another=
 interesting aspect of the whole solution. However, I believe that the prob=
lem scope of this document is much smaller: ingress
 LSR to detect readiness of RSVP signaled LSP. For RSVP signaled LSP, only =
the LSP that is =E2=80=9Cpassing the test=E2=80=9D can be tied to the tunne=
l as the active LSP, so at least the ingress LSR will not pump traffic into=
 the tunnel without knowing whether DP end-to-end
 is ready or not. Assuming that there are other ways to get to the egress L=
SR from this ingress LSR, then the problem is solved. Otherwise the ingress=
 LSR will drop the traffic but the problem is contained to that network nod=
e (i.e. packets are not traversing
 un-ready LSP).</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Thanks!</span><u></u><=
u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">-Nobo</span><u></u><u>=
</u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><i><span lang=3D"EN-CA" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Cambria&quot;,serif;color:#0040c0">/himanshu</span></i><u><=
/u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><i><span lang=3D"EN-CA" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Cambria&quot;,serif;color:#0040c0">=C2=A0</span></i><u></u>=
<u></u></p>
</div>
</div>
<div>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in =
0in 0in">
<div>
<div>
<p class=3D"MsoNormal"><b><span lang=3D"EN-CA" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,sans-serif">From:</span></b><span><span lang=
=3D"EN-CA" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-se=
rif">=C2=A0</span></span><span lang=3D"EN-CA" style=3D"font-size:10.0pt;fon=
t-family:&quot;Tahoma&quot;,sans-serif">mpls
 [<a href=3D"mailto:mpls-bounces@ietf.org" target=3D"_blank"><span style=3D=
"color:purple">mailto:mpls-bounces@ietf.org</span></a>]<span>=C2=A0</span><=
b>On Behalf Of<span>=C2=A0</span></b>Thomas D. Nadeau<br>
<b>Sent:</b><span>=C2=A0</span>Thursday, November 20, 2014 9:43 AM<br>
<b>To:</b><span>=C2=A0</span>Sam Aldrin<br>
<b>Cc:</b><span>=C2=A0</span>Ronald Bonica;<span>=C2=A0</span><a href=3D"ma=
ilto:mpls@ietf.org" target=3D"_blank"><span style=3D"color:purple">mpls@iet=
f.org</span></a><br>
<b>Subject:</b><span>=C2=A0</span>Re: [mpls] draft-bonica-mpls-self-ping: R=
esponse to comments from the mike</span><u></u><u></u></p>
</div>
</div>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span><span lang=3D"EN-CA">=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0</span></span><span><span lang=3D=
"EN-CA">=C2=A0</span></span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span><span lang=3D"EN-CA">=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0</span></span><span><span lang=3D=
"EN-CA">=C2=A0</span></span><span lang=3D"EN-CA">To me what is described in=
 the draft seems like this is a description of a
 device/vendor feature that automates the basic procedures of 4379/etc.. Th=
is can and has been done for quite some time using other means such as onbo=
ard automated scripts/actions after paths are established/signaled. I say t=
his not to be glib, but because
 I built such a thing about 10 years ago that has been deployed widely.=C2=
=A0 Also, as Sam says, there is some deviation from RFC4379 which we should=
 ask is worth the additional complication (and required implementation + as=
sociated delay/etc...) versus just using
 the existing means.=C2=A0</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span><span lang=3D"EN-CA">=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0</span></span><span><span lang=3D=
"EN-CA">=C2=A0</span></span><span lang=3D"EN-CA">The bottom line is that we=
 should be asking ourselves whether or not this
 something we really need to standardize.</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span><span lang=3D"EN-CA">=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0</span></span><span><span lang=3D=
"EN-CA">=C2=A0</span></span><span lang=3D"EN-CA">=E2=80=94Tom</span><u></u>=
<u></u></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
<div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">On Nov 19, 2014:10:28 PM, at 10=
:28 PM, Sam Aldrin &lt;<a href=3D"mailto:aldrin.ietf@gmail.com" target=3D"_=
blank"><span style=3D"color:purple">aldrin.ietf@gmail.com</span></a>&gt; wr=
ote:</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Hi Ron,</span><u></u><u></u></p=
>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Still trying to understand the =
need for the draft, hence, have few of questions and need clarifications. A=
ppreciate your response in advance.</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">1. (clarification q) The Ingres=
s LSR sends the Echo request, with destination IP address to self, and forw=
ards to Egress LSR (sec 2), correct?=C2=A0 Is this the only thing which ide=
ntifies the Ingress LSR or something else
 too?</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">2. What happens if there is LSP=
 breakage or something and the Echo request ends up on transit LSR? Doesn&#=
39;t it process? I see that draft says, this will avoid control plane proce=
ssing. How so? The packet is forwarded from
 ingress to egress, which means, the egress will have to process the packet=
 i.e. look up the ip address to send it back to ingress.</span><u></u><u></=
u></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Draft says &quot;</span><span l=
ang=3D"EN-CA" style=3D"font-size:10.0pt">The egress LSR forwards the MPLS E=
cho message to its destination, the</span><u></u><u></u></p>
</div>
</div>
</div>
<pre style=3D"line-height:14.4pt"><span lang=3D"EN-CA">=C2=A0=C2=A0 ingress=
 LSR.=C2=A0 The egress LSR forwards the MPLS Echo message exactly</span><u>=
</u><u></u></pre>
<pre style=3D"line-height:14.4pt"><span lang=3D"EN-CA">=C2=A0=C2=A0 as it w=
ould forward any other packet.&quot;</span><u></u><u></u></pre>
<pre style=3D"line-height:14.4pt"><span lang=3D"EN-CA">=C2=A0</span><u></u>=
<u></u></pre>
<pre style=3D"line-height:14.4pt"><span lang=3D"EN-CA">Could you explain, h=
ow egress forwards the packet back to ingress w/o looking up the packet IP =
header i.e. in the data plane and no additional control plane of OAM proces=
s?</span><u></u><u></u></pre>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">3. Is the assertion that, if Ec=
ho Reply is received back at the ingress then it is failure, rather it shou=
ld receive Echo Request back at Ingress, correct?</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">4. Why can&#39;t you use LSP pr=
oxy ping to self via Egress?</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Will followup with additional q=
uestions, if any, based on your responses.</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">cheers</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">-sam</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
<div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">On Nov 19, 2014, at 8:38 AM, Ro=
nald Bonica &lt;<a href=3D"mailto:rbonica@juniper.net" target=3D"_blank"><s=
pan style=3D"color:purple">rbonica@juniper.net</span></a>&gt; wrote:</span>=
<u></u><u></u></p>
</div>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">Folks<br>
<br>
At IETF 91, the following points were raised with regard to draft-bonica-mp=
ls-self-ping:<br>
<br>
1) Why not use BFD?<br>
2) Self-ping does not diagnose FIB programming errors in which an LSR other=
 than the egress de-encapsulates and forwards the packet.<br>
3) How does Self ping verify a bidirectional LSP&#39;s readiness to carry t=
raffic in both directions?<br>
4) Why does MPLS Self ping use MPLS Echo packets, as opposed to ICMP echo p=
ackets or some other packet format?<br>
<br>
Responses follow:<br>
<br>
1) Why not use BFD?<br>
<br>
Self Ping is an extremely light-weight protocol. A typical Self Ping sessio=
n emits one or two packets and terminates less than one second after initia=
tion. Self-ping requires no configuration or control plane resources on the=
 egress LSR.<span>=C2=A0</span><br>
<br>
By contrast, BFD is designed to verify bi-directional connectivity over a l=
onger period of time. Therefore, MPLS Self Ping is appropriate in environme=
nts where BFD is too resource intensive.<br>
<br>
2) Self-ping does not diagnose programming errors in which an LSR other tha=
n the egress de-encapsulates and forwards the packet.<br>
<br>
Self Ping is designed to verify LSP readiness without consuming control pla=
ne resources on the egress router. It is not designed to diagnose programmi=
ng errors in which an LSR other than the egress de-encapsulates and forward=
s the packet. Mechanisms that diagnose
 such issues are available [RFC 4950]. However, they are more resource inte=
nsive.<br>
<br>
3) How does Self ping verify a bidirectional LSP&#39;s readiness to carry t=
raffic in both directions?<br>
<br>
In order to verify bidirectional LSP readiness, RSVP instantiates two LSP S=
elf Ping sessions, one at each end of the LSP. The LSR at one end of the LS=
P initiates a self ping session when it receives a RESV message. The LSR at=
 the other end of the LSP initiates
 a Self Ping Session when it sends a RESV message. Each LSP endpoint forwar=
ds traffic over the LSP only after the LSP Self Ping session terminates suc=
cessfully<br>
<br>
4) Why does LSP Self Ping use MPLS Echo packets, as opposed to some other p=
acket format?<br>
<br>
LSP Self Ping could have used many packet formats. The only hard requiremen=
t was to have one 64-bit field in which the 64 bit session identifier could=
 be encoded. The MPLS Echo packet was convenient because its Senders Handle=
 is 64-bits long.<span>=C2=A0</span><br>
<br>
I will update the draft to reflect this information.<br>
<br>
Ron Bonica<br>
<br>
_______________________________________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank"><span style=3D"color:pur=
ple">mpls@ietf.org</span></a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" target=3D"_blank"><s=
pan style=3D"color:purple">https://www.ietf.org/mailman/listinfo/mpls</span=
></a></span><u></u><u></u></p>
</div>
</div>
</div>
</blockquote>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">=C2=A0</span><u></u><u></u></p>
</div>
</div>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-CA">_______________________________=
________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank"><span style=3D"color:pur=
ple">mpls@ietf.org</span></a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" target=3D"_blank"><s=
pan style=3D"color:purple">https://www.ietf.org/mailman/listinfo/mpls</span=
></a></span><u></u><u></u></p>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div></div></div>
</div>
</div>

</blockquote></div><br></div>

--001a1134f6e6c311f70508b7a74e--


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Subject: [mpls] I-D Action: draft-ietf-mpls-ipv6-only-gap-04.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Multiprotocol Label Switching Working Group of the IETF.

        Title           : Gap Analysis for Operating IPv6-only MPLS Networks
        Authors         : Wesley George
                          Carlos Pignataro
	Filename        : draft-ietf-mpls-ipv6-only-gap-04.txt
	Pages           : 27
	Date            : 2014-11-25

Abstract:
   This document reviews the Multiprotocol Label Switching (MPLS)
   protocol suite in the context of IPv6 and identifies gaps that must
   be addressed in order to allow MPLS-related protocols and
   applications to be used with IPv6-only networks.  This document is
   intended to focus on gaps in the standards defining the MPLS suite,
   and not to highlight particular vendor implementations (or lack
   thereof) in the context of IPv6-only MPLS functionality.

   In the data plane, MPLS fully supports IPv6 and MPLS labeled packets
   can be carried over IPv6 packets in a variety of encapsulations.
   However, support for IPv6 among MPLS control plane protocols, MPLS
   applications, MPLS Operations, Administration, and Maintenance (OAM),
   and MIB modules is mixed, with some protocols having major gaps.  For
   most major gaps work is in progress to upgrade the relevant
   protocols.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-ipv6-only-gap/

There's also a htmlized version available at:
http://tools.ietf.org/html/draft-ietf-mpls-ipv6-only-gap-04

A diff from the previous version is available at:
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From nobody Tue Nov 25 17:28:53 2014
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From: "Nobo Akiya (nobo)" <nobo@cisco.com>
To: "mpls@ietf.org" <mpls@ietf.org>, "rtg-bfd@ietf.org" <rtg-bfd@ietf.org>
Thread-Topic: Adoption poll for draft-grmas-bfd-rfc5884-clarifications (ends December 12, 2014)
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Subject: Re: [mpls] Adoption poll for draft-grmas-bfd-rfc5884-clarifications (ends December 12, 2014)
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Dear MPLS WG,

As agreed at IETF91, we would like to keep the MPLS WG involved with draft-=
grmas-bfd-rfc5884-clarifications.

The document clarifies the procedures of BFD on MPLS. If this topic is of y=
our interest, please do read and provide comments.

Note, the WG adoption poll for draft-grmas-bfd-rfc5884-clarifications was j=
ust kicked off today (and ends on Dec. 12, 2014).

Thanks!

-Nobo and Jeff

> -----Original Message-----
> From: Rtg-bfd [mailto:rtg-bfd-bounces@ietf.org] On Behalf Of Jeffrey Haas
> Sent: Tuesday, November 25, 2014 7:50 PM
> To: rtg-bfd@ietf.org
> Subject: Adoption poll for draft-grmas-bfd-rfc5884-clarifications (ends
> December 12, 2014)
>=20
> Working Group,
>=20
> Clarifications to RFC 5884, draft-grmas-bfd-rfc5884-clarifications, was
> presented at IETF-91 in Honolulu and was positively received.  We'd like =
to
> ask the Working Group whether we should formally adopt this draft as a
> Working Group item.
>=20
> Please indicate your support or lack thereof to the mail list by December=
 12,
> 2014.
>=20
> Also, please supply feedback to the authors.  I believe the perception of=
 this
> document is that it's very nearly complete and thus should have a short
> lifetime prior to publication as an RFC.
>=20
> -- Jeff & Nobo.


From nobody Tue Nov 25 18:43:30 2014
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Changed milestone "Submit draft-ietf-mpls-ipv6-only-gap for
publication", resolved as "Done".

URL: http://datatracker.ietf.org/wg/mpls/charter/


From nobody Tue Nov 25 19:01:17 2014
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Date: Wed, 26 Nov 2014 11:00:48 +0800
From: Loa Andersson <loa@pi.nu>
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To: Sam Aldrin <aldrin.ietf@gmail.com>,  Ronald Bonica <rbonica@juniper.net>
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Subject: Re: [mpls] draft-bonica-mpls-self-ping: Response to comments from the mike
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Folks,

I did a chair-review that I sent to the authors. In that review (the
rest is pretty much editorial) I clearly miss the the "non-relationship" 
with 4379.

I think what I see from the discussion between Sam and Ron are
that we want to:

- borrow the message format from 4379
- create a new message typ
- I with Sam that that message type should be named to avoid being
   confused with MPLS Echo Request and MPLS Echo Reply
- whether we'd like to register this message type in the "Message
   Type" registry in "Multi-  Protocol Label Switching (MPLS) Label
   Switched Paths (LSPs) Ping Parameters" is an open question.
- but since the new message type will come out of the "Standards
   Action" registry the document needs to be Standards Track.

/Loa

On 2014-11-26 07:56, Sam Aldrin wrote:
> Hi Ron,
>
> Thanks for the reply.
>
> [sorry for the top post]
>
> Glad that we are on the same page.
> Now that we are clear that this ID is not related to RFC4379 but borrows
> the model and format of packet structure, etc, I do not have a problem
> as such, provided the draft text is worded that way.
> Not just for the reasoning purposes, but adds clarity to what you intend
> to do and not confuse readers with LSP ping.
> W.r.t. Request / Reply, I prefer to have new terms defined and identify
> them in the terminology section. For ex: 'Self Ping Message' or
> something else.
>
> RFC4379 may not define different message formats for Echo Request and
> Echo Reply, it clearly identifies those message types.
>
> cheers
> -sam
>
>
> On Tue, Nov 25, 2014 at 3:28 PM, Ronald Bonica <rbonica@juniper.net
> <mailto:rbonica@juniper.net>> wrote:
>
>     Sam and Carlos,____
>
>     __ __
>
>     You are correct in that LSP Self-ping has very little to do with LSP
>     Ping [RFC 4379]. In fact, aside from borrowing the message format,
>     it has **nothing** to do with RFC 4379]! ____
>
>     __ __
>
>     Rationale follows:____
>
>     __ __
>
>     __-__LSP Self-ping messages do not carry the router alert message____
>
>     __-__Transit and egress LSRs don’t examine or process LSP Ping
>     messages; they simply forward them____
>
>     __-__Only the ingress LSR listens for LSP Self Ping messages____
>
>     __-__The ingress LSR listens for LSP Self Ping messages on a
>     different port than it listens for LSP Ping messages____
>
>     __-__The ingess LSR never responds to an LSP Self Ping message.____
>
>     __ __
>
>     I will make this explicit in the next version of the draft.____
>
>     __ __
>
>     Sam,____
>
>     __ __
>
>     You raise another point that Loa also raised in his chairs review.
>     RFC 4379 does not specify Echo Request and Echo Reply messages. It
>     specifies a single Echo message with a Message Type field (request
>     or reply). In draft-bonica-mpls-self-ping, I retain that
>     terminology. However, Loa suggests that I refer to an Echo Reply
>     message for clarity. I tend to agree with Loa. What do you think?____
>
>     __ __
>
>                                                                                                                                                       Ron____
>
>     ____
>
>     __ __
>
>     *From:*Sam Aldrin [mailto:aldrin.ietf@gmail.com
>     <mailto:aldrin.ietf@gmail.com>]
>     *Sent:* Tuesday, November 25, 2014 3:49 AM
>     *To:* Ronald Bonica
>     *Cc:* Shah, Himanshu; Nobo Akiya (nobo); Shahram Davari; Thomas
>     Nadeau; mpls@ietf.org <mailto:mpls@ietf.org>
>
>
>     *Subject:* Re: [mpls] draft-bonica-mpls-self-ping: Response to
>     comments from the mike____
>
>     __ __
>
>     Ron,____
>
>     __ __
>
>     I do not think the reason specifying it as LSP ping is correct. ____
>
>     Although you are using LSP ping Echo reply like packet format, it is
>     not LSP ping packet as it doesn't confirm to RFC4379.____
>
>     For ex: MPLS Echo Reply is only sent when MPLS Echo Request is
>     received. Neither does it detect any dataplane failures, which is
>     the title of the RFC. ____
>
>     __ __
>
>     Hence, I am not convinced that this ID warrants informational RFC,
>     which is based on RFC4379.____
>
>     __ __
>
>     But if you want to keep the ID out side the perview of RFC4379, then
>     it should be updated accordingly and discussion should be on those
>     lines.____
>
>     __ __
>
>     cheers____
>
>     -sam____
>
>         On Nov 21, 2014, at 2:19 PM, Ronald Bonica <rbonica@juniper.net
>         <mailto:rbonica@juniper.net>> wrote:____
>
>         __ __
>
>         Shah,____
>
>         ____
>
>         Because there are no interoperability implications, there is no
>         need for a standards track RFC. However, because LSP Ping sends
>         traffic off-box, an INFORMATIONAL RFC is appropriate. LSP Ping
>         traffic might be detected by counters, intrusion detection
>         devices and firewalls. We should document all of the OAM traffic
>         that we generate.____
>
>         ____
>
>                                             Ron____
>
>         ____
>
>         ____
>
>         *From:*Shah, Himanshu [mailto:hshah@ciena.com]
>         *Sent:*Thursday, November 20, 2014 7:05 PM
>         *To:*Nobo Akiya (nobo); Sam Aldrin; Shahram Davari
>         *Cc:*Thomas Nadeau; Ronald Bonica; mpls@ietf.org
>         <mailto:mpls@ietf.org>
>         *Subject:*RE: [mpls] draft-bonica-mpls-self-ping: Response to
>         comments from the mike____
>
>         ____
>
>         /Understand documenting helpful techniques (more useful during
>         restoration/re-optimization cases) as informational RFC, but I
>         believe IETF usually/____
>
>         /entertains proposals which has interoperability implications,
>         AFAIK./____
>
>         //____
>
>         /Which is what others are saying as well…/____
>
>         //____
>
>         /Thanks,/____
>
>         /himanshu/____
>
>         //____
>
>         *From:*Nobo Akiya (nobo) [mailto:nobo@cisco.com]
>         *Sent:*Thursday, November 20, 2014 6:23 PM
>         *To:*Sam Aldrin; Shahram Davari
>         *Cc:*Shah, Himanshu; Thomas Nadeau; Ronald Bonica;mpls@ietf.org
>         <mailto:mpls@ietf.org>
>         *Subject:*RE: [mpls] draft-bonica-mpls-self-ping: Response to
>         comments from the mike____
>
>         ____
>
>         Thanks for not shooting me Sam but I’m really not the messengerJ____
>
>         ____
>
>         If there is a good proposal that covers set of LSP types with
>         [virtually] no imitations, then documenting such proposal has an
>         value, IMHO.____
>
>         ____
>
>         I’d agree that current contents of this document may not provide
>         sufficient value to be pursued as an informational document, but
>         I’m not hopeless that something could come out of this.____
>
>         ____
>
>         Thanks!____
>
>         ____
>
>         -Nobo____
>
>         ____
>
>         *From:*Sam Aldrin [mailto:aldrin.ietf@gmail.com]
>         *Sent:*Thursday, November 20, 2014 2:57 PM
>         *To:*Shahram Davari
>         *Cc:*Nobo Akiya (nobo); Shah, Himanshu; Thomas Nadeau; Ronald
>         Bonica;mpls@ietf.org <mailto:mpls@ietf.org>
>         *Subject:*Re: [mpls] draft-bonica-mpls-self-ping: Response to
>         comments from the mike____
>
>         ____
>
>         Hi Nobo,____
>
>         ____
>
>         [without shooting the messenger]____
>
>         ____
>
>         In addition to what you listed, would like to see details on how
>           this ID will improve the performance at Egress should be
>         clarified.____
>
>         i.e. IP routing Vs OAM process (w/o FEC validation). Also, how
>         this model helps if reverse IP path is not available
>         (inter-domain, reverse path broken, non-routable ingress IP
>         address) and to what gain?____
>
>         ____
>
>         There are many ways the LSP ping is being used, both as
>         proprietary and also part of eco system.____
>
>         If we go by the logic that this ID is needed, we will have slew
>         of new ID’s detailing different usage models.____
>
>         ____
>
>         Hence, I totally agree with what Shahram and others have
>         indicated.____
>
>         ____
>
>         -sam____
>
>         ____
>
>             On Nov 20, 2014, at 11:15 AM, Shahram Davari
>             <davari@broadcom.com <mailto:davari@broadcom.com>> wrote:____
>
>             ____
>
>             Hi,____
>
>
>             Since the procedures in this draft generates and processes
>             the test packets on the same router and since other routers
>             just forward normally,  why do we even need a draft? There
>             is no interoperability requirements, and each vendor can
>             implement what they like.____
>
>             ____
>
>             Thanks____
>
>             Shahram____
>
>             ____
>
>             *From:*mpls [mailto:mpls-bounces@ietf.org]*On Behalf Of*Nobo
>             Akiya (nobo)
>             *Sent:*Thursday, November 20, 2014 10:57 AM
>             *To:*Shah, Himanshu; Thomas D. Nadeau; Sam Aldrin
>             *Cc:*Ronald Bonica;mpls@ietf.org <mailto:mpls@ietf.org>
>             *Subject:*Re: [mpls] draft-bonica-mpls-self-ping: Response
>             to comments from the mike____
>
>             ____
>
>             Hi,____
>
>             ____
>
>             Sort of summarizing what’s been stated but here’s my
>             observation of draft-bonica-mpls-self-ping.____
>
>             ____
>
>             1.LSP Ping and BFD MPLS already do what is being proposed.____
>
>             2.Ron needs a mechanism that is more efficient on egress
>             LSRs, with respect to resources and operational aspects.____
>
>             3.Any probe packet having destination IP address as the
>             ingress LSR has limitations in terms of how effective it can
>             verify the DP readiness.____
>
>             4.The proposal by Ron is limited to those LSPs that signal
>             via ordered mode (ex: LDP independent mode will not work) -
>             same problem as (3).____
>
>             ____
>
>             If the intent of draft-bonica-mpls-self-ping is just to
>             document what has been implemented or what is being
>             implemented, I’d like to request followings to be captured
>             in the document.____
>
>             -limitations (3 and 4) so that readers are aware of them.____
>
>             -usage of non-127/8 address as destination IP address in
>             MPLS echo request/reply deviates from RFC4379.____
>
>             ____
>
>             If the intent of draft-bonica-mpls-self-ping is to advocate
>             a mechanism for efficient MPLS DP readiness test, and I’d
>             like to request that:____
>
>             -requirements (2) are well captured.____
>
>             -S-BFD be evaluated (as it addresses the efficiency
>             requirements and does not have limitations described by 3
>             and 4).____
>
>             ____
>
>             Himanshu, I have one comment in-line below. Please look for
>             [NOBO].____
>
>             ____
>
>             ____
>
>             *From:*mpls [mailto:mpls-bounces@ietf.org]*On Behalf
>             Of*Shah, Himanshu
>             *Sent:*Thursday, November 20, 2014 10:36 AM
>             *To:*Thomas D. Nadeau; Sam Aldrin
>             *Cc:*Ronald Bonica;mpls@ietf.org <mailto:mpls@ietf.org>
>             *Subject:*Re: [mpls] draft-bonica-mpls-self-ping: Response
>             to comments from the mike____
>
>             ____
>
>             /This is exactly what I said at Mic./____
>
>             /We have been deploying MPLS for a while and if such DP
>             active verification was necessary, vendors have solved it
>             without/____
>
>             /standard specific solution, may that be BFD or self-ping./____
>
>             //____
>
>             /One of the argument made was that client BFD session
>             detects that “tunnel is active but DP is not”./____
>
>             /Does it imply there is some kind of UNI signaling going on
>             between PE and CE to indicate that tunnel has become/____
>
>             /active, commence data? And the idea is that PE will refrain
>             notification until self-ping verify DP active?/____
>
>             //____
>
>             /If that is not the case then this technique is not even
>             useful – self ping is not actually causing the DP to become
>             active,/____
>
>             /If it doesn’t become active in the time window, what is PE
>             going to do?/____
>
>             //____
>
>             [NOBO] That is another interesting aspect of the whole
>             solution. However, I believe that the problem scope of this
>             document is much smaller: ingress LSR to detect readiness of
>             RSVP signaled LSP. For RSVP signaled LSP, only the LSP that
>             is “passing the test” can be tied to the tunnel as the
>             active LSP, so at least the ingress LSR will not pump
>             traffic into the tunnel without knowing whether DP
>             end-to-end is ready or not. Assuming that there are other
>             ways to get to the egress LSR from this ingress LSR, then
>             the problem is solved. Otherwise the ingress LSR will drop
>             the traffic but the problem is contained to that network
>             node (i.e. packets are not traversing un-ready LSP).____
>
>             ____
>
>             Thanks!____
>
>             ____
>
>             -Nobo____
>
>             ____
>
>             ____
>
>             //himanshu/____
>
>             //____
>
>             *From:*mpls [mailto:mpls-bounces@ietf.org]*On Behalf
>             Of*Thomas D. Nadeau
>             *Sent:*Thursday, November 20, 2014 9:43 AM
>             *To:*Sam Aldrin
>             *Cc:*Ronald Bonica;mpls@ietf.org <mailto:mpls@ietf.org>
>             *Subject:*Re: [mpls] draft-bonica-mpls-self-ping: Response
>             to comments from the mike____
>
>             ____
>
>             ____
>
>             To me what is described in the draft seems like this is a
>             description of a device/vendor feature that automates the
>             basic procedures of 4379/etc.. This can and has been done
>             for quite some time using other means such as onboard
>             automated scripts/actions after paths are
>             established/signaled. I say this not to be glib, but because
>             I built such a thing about 10 years ago that has been
>             deployed widely.  Also, as Sam says, there is some deviation
>             from RFC4379 which we should ask is worth the additional
>             complication (and required implementation + associated
>             delay/etc...) versus just using the existing means. ____
>
>             ____
>
>             The bottom line is that we should be asking ourselves
>             whether or not this something we really need to standardize.____
>
>             ____
>
>             —Tom____
>
>             ____
>
>             ____
>
>             ____
>
>                 On Nov 19, 2014:10:28 PM, at 10:28 PM, Sam Aldrin
>                 <aldrin.ietf@gmail.com <mailto:aldrin.ietf@gmail.com>>
>                 wrote:____
>
>                 ____
>
>                 Hi Ron,____
>
>                 ____
>
>                 Still trying to understand the need for the draft,
>                 hence, have few of questions and need clarifications.
>                 Appreciate your response in advance.____
>
>                 ____
>
>                 1. (clarification q) The Ingress LSR sends the Echo
>                 request, with destination IP address to self, and
>                 forwards to Egress LSR (sec 2), correct?  Is this the
>                 only thing which identifies the Ingress LSR or something
>                 else too?____
>
>                 2. What happens if there is LSP breakage or something
>                 and the Echo request ends up on transit LSR? Doesn't it
>                 process? I see that draft says, this will avoid control
>                 plane processing. How so? The packet is forwarded from
>                 ingress to egress, which means, the egress will have to
>                 process the packet i.e. look up the ip address to send
>                 it back to ingress.____
>
>                 ____
>
>                 Draft says "The egress LSR forwards the MPLS Echo
>                 message to its destination, the____
>
>                     ingress LSR.  The egress LSR forwards the MPLS Echo message exactly____
>
>                     as it would forward any other packet."____
>
>                   ____
>
>                 Could you explain, how egress forwards the packet back to ingress w/o looking up the packet IP header i.e. in the data plane and no additional control plane of OAM process?____
>
>                 3. Is the assertion that, if Echo Reply is received back
>                 at the ingress then it is failure, rather it should
>                 receive Echo Request back at Ingress, correct?____
>
>                 4. Why can't you use LSP proxy ping to self via Egress?____
>
>                 ____
>
>                 Will followup with additional questions, if any, based
>                 on your responses.____
>
>                 ____
>
>                 cheers____
>
>                 -sam____
>
>                 ____
>
>                     On Nov 19, 2014, at 8:38 AM, Ronald Bonica
>                     <rbonica@juniper.net <mailto:rbonica@juniper.net>>
>                     wrote:____
>
>                     ____
>
>                     Folks
>
>                     At IETF 91, the following points were raised with
>                     regard to draft-bonica-mpls-self-ping:
>
>                     1) Why not use BFD?
>                     2) Self-ping does not diagnose FIB programming
>                     errors in which an LSR other than the egress
>                     de-encapsulates and forwards the packet.
>                     3) How does Self ping verify a bidirectional LSP's
>                     readiness to carry traffic in both directions?
>                     4) Why does MPLS Self ping use MPLS Echo packets, as
>                     opposed to ICMP echo packets or some other packet
>                     format?
>
>                     Responses follow:
>
>                     1) Why not use BFD?
>
>                     Self Ping is an extremely light-weight protocol. A
>                     typical Self Ping session emits one or two packets
>                     and terminates less than one second after
>                     initiation. Self-ping requires no configuration or
>                     control plane resources on the egress LSR.
>
>                     By contrast, BFD is designed to verify
>                     bi-directional connectivity over a longer period of
>                     time. Therefore, MPLS Self Ping is appropriate in
>                     environments where BFD is too resource intensive.
>
>                     2) Self-ping does not diagnose programming errors in
>                     which an LSR other than the egress de-encapsulates
>                     and forwards the packet.
>
>                     Self Ping is designed to verify LSP readiness
>                     without consuming control plane resources on the
>                     egress router. It is not designed to diagnose
>                     programming errors in which an LSR other than the
>                     egress de-encapsulates and forwards the packet.
>                     Mechanisms that diagnose such issues are available
>                     [RFC 4950]. However, they are more resource intensive.
>
>                     3) How does Self ping verify a bidirectional LSP's
>                     readiness to carry traffic in both directions?
>
>                     In order to verify bidirectional LSP readiness, RSVP
>                     instantiates two LSP Self Ping sessions, one at each
>                     end of the LSP. The LSR at one end of the LSP
>                     initiates a self ping session when it receives a
>                     RESV message. The LSR at the other end of the LSP
>                     initiates a Self Ping Session when it sends a RESV
>                     message. Each LSP endpoint forwards traffic over the
>                     LSP only after the LSP Self Ping session terminates
>                     successfully
>
>                     4) Why does LSP Self Ping use MPLS Echo packets, as
>                     opposed to some other packet format?
>
>                     LSP Self Ping could have used many packet formats.
>                     The only hard requirement was to have one 64-bit
>                     field in which the 64 bit session identifier could
>                     be encoded. The MPLS Echo packet was convenient
>                     because its Senders Handle is 64-bits long.
>
>                     I will update the draft to reflect this information.
>
>                     Ron Bonica
>
>                     _______________________________________________
>                     mpls mailing list
>                     mpls@ietf.org <mailto:mpls@ietf.org>
>                     https://www.ietf.org/mailman/listinfo/mpls____
>
>                 ____
>
>                 _______________________________________________
>                 mpls mailing list
>                 mpls@ietf.org <mailto:mpls@ietf.org>
>                 https://www.ietf.org/mailman/listinfo/mpls____
>
>     __ __
>
>
>
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


From nobody Tue Nov 25 20:25:26 2014
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From: "Kamran Raza (skraza)" <skraza@cisco.com>
To: "mpls@ietf.org" <mpls@ietf.org>, "rtg-yang-coord@ietf.org" <rtg-yang-coord@ietf.org>
Thread-Topic: Yang model for LDP/mLDP
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Date: Wed, 26 Nov 2014 04:25:08 +0000
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Subject: [mpls] Yang model for LDP/mLDP
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--_000_D09ABB9723B58skrazaciscocom_
Content-Type: text/plain; charset="Windows-1252"
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Hi,

We would like to bring into your kind notice that a multi-vendor team has s=
tarted working on the design of the Yang model for LDP/mLDP.  Currently, th=
e team comprise following members:

  Robin Li - lizhenbin@huawei.com<mailto:lizhenbin@huawei.com> (Huawei)
  Jescia Chen - jescia.chenxia@huawei.com<mailto:jescia.chenxia@huawei.com>=
 (Huawei)
  Kamran Raza  - skraza@cisco.com<mailto:skraza@cisco.com> (Cisco)
  Reshad Rahman - rrahman@cisco.com<mailto:rrahman@cisco.com> (Cisco)
  Santosh Esale - sesale@juniper.net<mailto:sesale@juniper.net> (Juniper)
  Vishnu Pavan Beeram - vbeeram@juniper.net<mailto:vbeeram@juniper.net> (Ju=
niper)
  Himanshu Shah - hshah@ciena.com<mailto:hshah@ciena.com> (Ciena)

The team had our first formal meeting today and we have scheduled calls to =
meet weekly to make progress on LDP yang model in upcoming weeks. We will k=
eep MPLS WG and rtg-yang-coord alias posted with regards to our progress, a=
s well as, solicit input as/when required.
[ P.S.:  If you wish to contribute to the design of LDP/mLDP yang model, pl=
ease let me know accordingly by sending an email and I will add you to the =
team / meeting invite]

FYI, following is the summary of the main points discussed/agreed in our fi=
rst meeting:

1- The scope of our work (and document) includes:
- LDP, mLDP, and Multi-topology (LDP/mLDP)
        - Config, Operational State, Notifications, and RPCs

2- We have broken the effort into following phases:
       ph1- Overall config model/hierarchy (keeping LDP/mLDP/MT in mind)
       ph2- LDP: cfg, notifs, rpcs
       ph3- mLDP: cfg, notifs, rpcs
       ph4- LDP: state
       ph5- mLDP: state
       ph6- Multi-topology (everything)

3- The plan is to have the ph1-3 completed before next IETF and the draft p=
osted with the update.

4- In the meantime (and in parallel), we will continue to attend MPLS level=
 Yang meetings (to be arranged by Tarek)
    to define MPLS common base, and leverage LDP yang accordingly.

5- The next meeting/call for LDP Yang will be on Tue Dec 2nd with the follo=
wing agenda:
     - Complete discussions on ph1.
     - Deep dive into ph2 (define overall LDP cfg tree, followed by expansi=
on of each container)

Rgds,
=97
Kamran
(on behalf of LDP Yang team)

--_000_D09ABB9723B58skrazaciscocom_
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DWindows-1=
252">
</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin=
e-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-fami=
ly: Calibri, sans-serif;">
<div>Hi,</div>
<div><br>
</div>
<div>We would like to bring into your kind notice that a multi-vendor team =
has started working on the design of the Yang model for LDP/mLDP. &nbsp;Cur=
rently, the team comprise following members:</div>
<div><br>
</div>
<div>&nbsp; Robin Li -&nbsp;<a href=3D"mailto:lizhenbin@huawei.com">lizhenb=
in@huawei.com</a>&nbsp;(Huawei)</div>
<div>&nbsp; Jescia Chen -&nbsp;<a href=3D"mailto:jescia.chenxia@huawei.com"=
>jescia.chenxia@huawei.com</a>&nbsp;(Huawei)</div>
<div>&nbsp; Kamran Raza &nbsp;-&nbsp;<a href=3D"mailto:skraza@cisco.com">sk=
raza@cisco.com</a>&nbsp;(Cisco)</div>
<div>&nbsp; Reshad Rahman -&nbsp;<a href=3D"mailto:rrahman@cisco.com">rrahm=
an@cisco.com</a>&nbsp;(Cisco)</div>
<div>&nbsp; Santosh Esale -&nbsp;<a href=3D"mailto:sesale@juniper.net">sesa=
le@juniper.net</a>&nbsp;(Juniper)</div>
<div>&nbsp; Vishnu Pavan Beeram -&nbsp;<a href=3D"mailto:vbeeram@juniper.ne=
t">vbeeram@juniper.net</a>&nbsp;(Juniper)</div>
<div>&nbsp; Himanshu Shah -&nbsp;<a href=3D"mailto:hshah@ciena.com">hshah@c=
iena.com</a>&nbsp;(Ciena)</div>
<div><br>
</div>
<div>The team had our first formal meeting today and we have scheduled call=
s to meet weekly to make progress on LDP yang model in upcoming weeks. We w=
ill keep MPLS WG and rtg-yang-coord&nbsp;alias posted with regards to our p=
rogress, as well as, solicit input as/when
 required.</div>
<div>[ P.S.: &nbsp;If you wish to contribute to the design of LDP/mLDP yang=
 model, please let me know accordingly by sending an email and I will add y=
ou to the team / meeting invite]</div>
<div><br>
</div>
<div>FYI, following is the summary of the main points discussed/agreed in o=
ur first meeting:</div>
<div><br>
</div>
<div>1- The scope of our work (and document) includes:</div>
<div><span class=3D"Apple-tab-span" style=3D"white-space:pre"></span>-&nbsp=
;LDP, mLDP, and Multi-topology (LDP/mLDP)</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp; - Config, Operational State, Notifications=
, and RPCs</div>
<div><br>
</div>
<div>2- We have broken the effort into following phases:</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp;ph1- Overall config model/hierarchy (keepin=
g LDP/mLDP/MT in mind)</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp;ph2- LDP: cfg, notifs, rpcs</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp;ph3- mLDP: cfg, notifs, rpcs</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp;ph4- LDP: state</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp;ph5- mLDP: state</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp;ph6- Multi-topology (everything)</div>
<div><br>
</div>
<div>3- The plan is to have the ph1-3 completed before next IETF and the dr=
aft posted with the update.</div>
<div><br>
</div>
<div>
<div>4- In the meantime (and in parallel), we will continue to attend MPLS =
level Yang meetings (to be arranged by Tarek)&nbsp;</div>
<div>&nbsp; &nbsp; to define MPLS common base, and leverage LDP yang accord=
ingly.</div>
</div>
<div><br>
</div>
<div>5- The next meeting/call for LDP Yang will be on Tue Dec 2nd with the =
following agenda:</div>
<div>&nbsp; &nbsp; &nbsp;- Complete discussions on ph1.</div>
<div>&nbsp; &nbsp; &nbsp;- Deep dive into ph2 (define overall LDP cfg tree,=
 followed by expansion of each container)</div>
<div><br>
</div>
<div>Rgds,</div>
<div>=97</div>
<div>Kamran&nbsp;</div>
<div>(on behalf of LDP Yang team)</div>
</body>
</html>

--_000_D09ABB9723B58skrazaciscocom_--


From nobody Tue Nov 25 21:46:33 2014
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From: "Srihari Raghavan (srihari)" <srihari@cisco.com>
To: "Nobo Akiya (nobo)" <nobo@cisco.com>, "mpls@ietf.org" <mpls@ietf.org>, "rtg-bfd@ietf.org" <rtg-bfd@ietf.org>
Thread-Topic: Adoption poll for draft-grmas-bfd-rfc5884-clarifications (ends December 12, 2014)
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Subject: Re: [mpls] Adoption poll for draft-grmas-bfd-rfc5884-clarifications (ends December 12, 2014)
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Fully support the adoption, as one of the implementors of the base draft.

Thanks
Srihari

On 26/11/14 6:58 am, "Nobo Akiya (nobo)" <nobo@cisco.com> wrote:

>Dear MPLS WG,
>
>As agreed at IETF91, we would like to keep the MPLS WG involved with
>draft-grmas-bfd-rfc5884-clarifications.
>
>The document clarifies the procedures of BFD on MPLS. If this topic is of
>your interest, please do read and provide comments.
>
>Note, the WG adoption poll for draft-grmas-bfd-rfc5884-clarifications was
>just kicked off today (and ends on Dec. 12, 2014).
>
>Thanks!
>
>-Nobo and Jeff
>
>> -----Original Message-----
>> From: Rtg-bfd [mailto:rtg-bfd-bounces@ietf.org] On Behalf Of Jeffrey
>>Haas
>> Sent: Tuesday, November 25, 2014 7:50 PM
>> To: rtg-bfd@ietf.org
>> Subject: Adoption poll for draft-grmas-bfd-rfc5884-clarifications (ends
>> December 12, 2014)
>>=20
>> Working Group,
>>=20
>> Clarifications to RFC 5884, draft-grmas-bfd-rfc5884-clarifications, was
>> presented at IETF-91 in Honolulu and was positively received.  We'd
>>like to
>> ask the Working Group whether we should formally adopt this draft as a
>> Working Group item.
>>=20
>> Please indicate your support or lack thereof to the mail list by
>>December 12,
>> 2014.
>>=20
>> Also, please supply feedback to the authors.  I believe the perception
>>of this
>> document is that it's very nearly complete and thus should have a short
>> lifetime prior to publication as an RFC.
>>=20
>> -- Jeff & Nobo.
>


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From: Jeff Tantsura <jeff.tantsura@ericsson.com>
To: "Kamran Raza (skraza)" <skraza@cisco.com>, "mpls@ietf.org" <mpls@ietf.org>, "rtg-yang-coord@ietf.org" <rtg-yang-coord@ietf.org>
Thread-Topic: [mpls] Yang model for LDP/mLDP
Thread-Index: AQHQCUO0iT5bMDq+Kkq87OHKKB2kog==
Date: Wed, 26 Nov 2014 06:39:18 +0000
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Cc: "vbeeram@juniper.net" <vbeeram@juniper.net>, "Reshad Rahman \(rrahman\)" <rrahman@cisco.com>, "jescia.chenxia@huawei.com" <jescia.chenxia@huawei.com>, "Benoit Claise \(bclaise\)" <bclaise@cisco.com>, "mpls-chairs@tools.ietf.org" <mpls-chairs@tools.ietf.org>
Subject: Re: [mpls] Yang model for LDP/mLDP
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--_000_D09AB5407C9FBjefftantsuraericssoncom_
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Hi Kamran,

Please add Xufeng Liu xufeng.liu@ericsson.com and myself from E/// side.
Thanks!

Cheers,
Jeff

From: "Kamran Raza (skraza)" <skraza@cisco.com<mailto:skraza@cisco.com>>
Date: Tuesday, November 25, 2014 at 8:25 PM
To: "mpls@ietf.org<mailto:mpls@ietf.org>" <mpls@ietf.org<mailto:mpls@ietf.o=
rg>>, "rtg-yang-coord@ietf.org<mailto:rtg-yang-coord@ietf.org>" <rtg-yang-c=
oord@ietf.org<mailto:rtg-yang-coord@ietf.org>>
Cc: "vbeeram@juniper.net<mailto:vbeeram@juniper.net>" <vbeeram@juniper.net<=
mailto:vbeeram@juniper.net>>, "Reshad Rahman (rrahman)" <rrahman@cisco.com<=
mailto:rrahman@cisco.com>>, "jescia.chenxia@huawei.com<mailto:jescia.chenxi=
a@huawei.com>" <jescia.chenxia@huawei.com<mailto:jescia.chenxia@huawei.com>=
>, "Benoit Claise (bclaise)" <bclaise@cisco.com<mailto:bclaise@cisco.com>>,=
 "mpls-chairs@tools.ietf.org<mailto:mpls-chairs@tools.ietf.org>" <mpls-chai=
rs@tools.ietf.org<mailto:mpls-chairs@tools.ietf.org>>
Subject: [mpls] Yang model for LDP/mLDP

Hi,

We would like to bring into your kind notice that a multi-vendor team has s=
tarted working on the design of the Yang model for LDP/mLDP.  Currently, th=
e team comprise following members:

  Robin Li - lizhenbin@huawei.com<mailto:lizhenbin@huawei.com> (Huawei)
  Jescia Chen - jescia.chenxia@huawei.com<mailto:jescia.chenxia@huawei.com>=
 (Huawei)
  Kamran Raza  - skraza@cisco.com<mailto:skraza@cisco.com> (Cisco)
  Reshad Rahman - rrahman@cisco.com<mailto:rrahman@cisco.com> (Cisco)
  Santosh Esale - sesale@juniper.net<mailto:sesale@juniper.net> (Juniper)
  Vishnu Pavan Beeram - vbeeram@juniper.net<mailto:vbeeram@juniper.net> (Ju=
niper)
  Himanshu Shah - hshah@ciena.com<mailto:hshah@ciena.com> (Ciena)

The team had our first formal meeting today and we have scheduled calls to =
meet weekly to make progress on LDP yang model in upcoming weeks. We will k=
eep MPLS WG and rtg-yang-coord alias posted with regards to our progress, a=
s well as, solicit input as/when required.
[ P.S.:  If you wish to contribute to the design of LDP/mLDP yang model, pl=
ease let me know accordingly by sending an email and I will add you to the =
team / meeting invite]

FYI, following is the summary of the main points discussed/agreed in our fi=
rst meeting:

1- The scope of our work (and document) includes:
- LDP, mLDP, and Multi-topology (LDP/mLDP)
        - Config, Operational State, Notifications, and RPCs

2- We have broken the effort into following phases:
       ph1- Overall config model/hierarchy (keeping LDP/mLDP/MT in mind)
       ph2- LDP: cfg, notifs, rpcs
       ph3- mLDP: cfg, notifs, rpcs
       ph4- LDP: state
       ph5- mLDP: state
       ph6- Multi-topology (everything)

3- The plan is to have the ph1-3 completed before next IETF and the draft p=
osted with the update.

4- In the meantime (and in parallel), we will continue to attend MPLS level=
 Yang meetings (to be arranged by Tarek)
    to define MPLS common base, and leverage LDP yang accordingly.

5- The next meeting/call for LDP Yang will be on Tue Dec 2nd with the follo=
wing agenda:
     - Complete discussions on ph1.
     - Deep dive into ph2 (define overall LDP cfg tree, followed by expansi=
on of each container)

Rgds,
=97
Kamran
(on behalf of LDP Yang team)

--_000_D09AB5407C9FBjefftantsuraericssoncom_
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DWindows-1=
252">
</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin=
e-break: after-white-space;">
<div>
<div>
<div><font face=3D"Calibri,sans-serif">Hi Kamran,</font></div>
<div><font face=3D"Calibri,sans-serif"><br>
</font></div>
<div><font face=3D"Calibri,sans-serif">Please add&nbsp;</font>Xufeng Liu xu=
feng.liu@ericsson.com and myself from E/// side.</div>
<div>Thanks!</div>
<div style=3D"color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-s=
ize: 14px;">
<div><span style=3D"font-family: Calibri; "><br>
</span></div>
<div><span style=3D"font-family: Calibri; ">Cheers,</span></div>
<div><font class=3D"Apple-style-span" color=3D"#000000"><font class=3D"Appl=
e-style-span" face=3D"Calibri">Jeff</font></font></div>
</div>
</div>
</div>
<div style=3D"color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-s=
ize: 14px;">
<br>
</div>
<span id=3D"OLK_SRC_BODY_SECTION" style=3D"color: rgb(0, 0, 0); font-family=
: Calibri, sans-serif; font-size: 14px;">
<div style=3D"font-family:Calibri; font-size:11pt; text-align:left; color:b=
lack; BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM:=
 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid;=
 BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<span style=3D"font-weight:bold">From: </span>&quot;Kamran Raza (skraza)&qu=
ot; &lt;<a href=3D"mailto:skraza@cisco.com">skraza@cisco.com</a>&gt;<br>
<span style=3D"font-weight:bold">Date: </span>Tuesday, November 25, 2014 at=
 8:25 PM<br>
<span style=3D"font-weight:bold">To: </span>&quot;<a href=3D"mailto:mpls@ie=
tf.org">mpls@ietf.org</a>&quot; &lt;<a href=3D"mailto:mpls@ietf.org">mpls@i=
etf.org</a>&gt;, &quot;<a href=3D"mailto:rtg-yang-coord@ietf.org">rtg-yang-=
coord@ietf.org</a>&quot; &lt;<a href=3D"mailto:rtg-yang-coord@ietf.org">rtg=
-yang-coord@ietf.org</a>&gt;<br>
<span style=3D"font-weight:bold">Cc: </span>&quot;<a href=3D"mailto:vbeeram=
@juniper.net">vbeeram@juniper.net</a>&quot; &lt;<a href=3D"mailto:vbeeram@j=
uniper.net">vbeeram@juniper.net</a>&gt;, &quot;Reshad Rahman (rrahman)&quot=
; &lt;<a href=3D"mailto:rrahman@cisco.com">rrahman@cisco.com</a>&gt;, &quot=
;<a href=3D"mailto:jescia.chenxia@huawei.com">jescia.chenxia@huawei.com</a>=
&quot;
 &lt;<a href=3D"mailto:jescia.chenxia@huawei.com">jescia.chenxia@huawei.com=
</a>&gt;, &quot;Benoit Claise (bclaise)&quot; &lt;<a href=3D"mailto:bclaise=
@cisco.com">bclaise@cisco.com</a>&gt;, &quot;<a href=3D"mailto:mpls-chairs@=
tools.ietf.org">mpls-chairs@tools.ietf.org</a>&quot; &lt;<a href=3D"mailto:=
mpls-chairs@tools.ietf.org">mpls-chairs@tools.ietf.org</a>&gt;<br>
<span style=3D"font-weight:bold">Subject: </span>[mpls] Yang model for LDP/=
mLDP<br>
</div>
<div><br>
</div>
<blockquote id=3D"MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE" style=3D"BORDER-LEFT:=
 #b5c4df 5 solid; PADDING:0 0 0 5; MARGIN:0 0 0 5;">
<div>
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line=
-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-famil=
y: Calibri, sans-serif;">
<div>Hi,</div>
<div><br>
</div>
<div>We would like to bring into your kind notice that a multi-vendor team =
has started working on the design of the Yang model for LDP/mLDP. &nbsp;Cur=
rently, the team comprise following members:</div>
<div><br>
</div>
<div>&nbsp; Robin Li -&nbsp;<a href=3D"mailto:lizhenbin@huawei.com">lizhenb=
in@huawei.com</a>&nbsp;(Huawei)</div>
<div>&nbsp; Jescia Chen -&nbsp;<a href=3D"mailto:jescia.chenxia@huawei.com"=
>jescia.chenxia@huawei.com</a>&nbsp;(Huawei)</div>
<div>&nbsp; Kamran Raza &nbsp;-&nbsp;<a href=3D"mailto:skraza@cisco.com">sk=
raza@cisco.com</a>&nbsp;(Cisco)</div>
<div>&nbsp; Reshad Rahman -&nbsp;<a href=3D"mailto:rrahman@cisco.com">rrahm=
an@cisco.com</a>&nbsp;(Cisco)</div>
<div>&nbsp; Santosh Esale -&nbsp;<a href=3D"mailto:sesale@juniper.net">sesa=
le@juniper.net</a>&nbsp;(Juniper)</div>
<div>&nbsp; Vishnu Pavan Beeram -&nbsp;<a href=3D"mailto:vbeeram@juniper.ne=
t">vbeeram@juniper.net</a>&nbsp;(Juniper)</div>
<div>&nbsp; Himanshu Shah -&nbsp;<a href=3D"mailto:hshah@ciena.com">hshah@c=
iena.com</a>&nbsp;(Ciena)</div>
<div><br>
</div>
<div>The team had our first formal meeting today and we have scheduled call=
s to meet weekly to make progress on LDP yang model in upcoming weeks. We w=
ill keep MPLS WG and rtg-yang-coord&nbsp;alias posted with regards to our p=
rogress, as well as, solicit input as/when
 required.</div>
<div>[ P.S.: &nbsp;If you wish to contribute to the design of LDP/mLDP yang=
 model, please let me know accordingly by sending an email and I will add y=
ou to the team / meeting invite]</div>
<div><br>
</div>
<div>FYI, following is the summary of the main points discussed/agreed in o=
ur first meeting:</div>
<div><br>
</div>
<div>1- The scope of our work (and document) includes:</div>
<div><span class=3D"Apple-tab-span" style=3D"white-space:pre"></span>-&nbsp=
;LDP, mLDP, and Multi-topology (LDP/mLDP)</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp; - Config, Operational State, Notifications=
, and RPCs</div>
<div><br>
</div>
<div>2- We have broken the effort into following phases:</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp;ph1- Overall config model/hierarchy (keepin=
g LDP/mLDP/MT in mind)</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp;ph2- LDP: cfg, notifs, rpcs</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp;ph3- mLDP: cfg, notifs, rpcs</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp;ph4- LDP: state</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp;ph5- mLDP: state</div>
<div>&nbsp; &nbsp; &nbsp; &nbsp;ph6- Multi-topology (everything)</div>
<div><br>
</div>
<div>3- The plan is to have the ph1-3 completed before next IETF and the dr=
aft posted with the update.</div>
<div><br>
</div>
<div>
<div>4- In the meantime (and in parallel), we will continue to attend MPLS =
level Yang meetings (to be arranged by Tarek)&nbsp;</div>
<div>&nbsp; &nbsp; to define MPLS common base, and leverage LDP yang accord=
ingly.</div>
</div>
<div><br>
</div>
<div>5- The next meeting/call for LDP Yang will be on Tue Dec 2nd with the =
following agenda:</div>
<div>&nbsp; &nbsp; &nbsp;- Complete discussions on ph1.</div>
<div>&nbsp; &nbsp; &nbsp;- Deep dive into ph2 (define overall LDP cfg tree,=
 followed by expansion of each container)</div>
<div><br>
</div>
<div>Rgds,</div>
<div>=97</div>
<div>Kamran&nbsp;</div>
<div>(on behalf of LDP Yang team)</div>
</div>
</div>
</blockquote>
</span>
</body>
</html>

--_000_D09AB5407C9FBjefftantsuraericssoncom_--


From nobody Wed Nov 26 02:34:39 2014
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Working Group,

We regret to announce that Martin is stepping down as MPLS
WG secretary. Afte a long term, Martin is now moving on to
new challenges as the co-chair of the newly formed BESS
Working Group.

Martin has set the bar very high for not only his successor, but
for all IETF WG Secretaries.  Much of what Martin does is behind
the scenes and the chairs want you to know what a great job he
has done in supporting us.  Martin has contributed greatly to
draft-secretaries-good-practices.  A substantial part of that draft
is based on his experiences in supporting the MPLS Working Group.

Martin has also been (and has promised to continue to be) a very
active member of the MPLS WG.

At the same time we are happy to announce that we found a replacement.
Tarek Saad will step in as our new secretary and Martin has promised
to effect a smooth transition.

Please join the working group chairs in thanking Martin and in welcoming 
Tarek.

Loa, Ross and George
MPLS WG co-chairs
-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


From nobody Wed Nov 26 11:01:21 2014
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Multiprotocol Label Switching Working Group of the IETF.

        Title           : mLDP In-Band Signaling with Wildcards
        Authors         : IJsbrand Wijnands
                          Eric C. Rosen
                          Arkadiy Gulko
                          Uwe Joorde
                          Jeff Tantsura
	Filename        : draft-ietf-mpls-mldp-in-band-wildcard-encoding-03.txt
	Pages           : 15
	Date            : 2014-11-26

Abstract:
   There are scenarios in which an IP multicast tree traverses an MPLS
   domain.  In these scenarios, it can be desirable to convert the IP
   multicast tree "seamlessly" to an MPLS multipoint label switched path
   (MP-LSP) when it enters the MPLS domain, and then to convert it back
   to an IP multicast tree when it exits the MPLS domain.  Previous
   documents specify procedures that allow certain kinds of IP multicast
   trees (either "Source-Specific Multicast" trees or "Bidirectional
   Multicast" trees) to be attached to an MPLS Multipoint Label Switched
   Path (MP-LSP).  However, the previous documents do not specify
   procedures for attaching IP "Any Source Multicast" trees to MP-LSPs,
   nor do they specify procedures for aggregating multiple IP multicast
   trees onto a single MP-LSP.  This document specifies the procedures
   to support these functions.  It does so by defining "wildcard"
   encodings that make it possible to specify, when setting up an MP-
   LSP, that a set of IP multicast trees, or a shared IP multicast tree,
   should be attached to that MP-LSP.  Support for non-bidirectional IP
   "Any Source Multicast" trees is subject to certain applicability
   restrictions that are discussed in this document.  This document
   updates RFCs 6826 and 7246.


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From nobody Wed Nov 26 21:54:25 2014
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Working Group,

We got a mail asking about the status of the MPLS Yang teams.

The background is that the authors of the mpls-yang IDs were asked
to prepare a joint presentation at the Honolulu meeting. The authors
(and other interested) met during the week and came up with
http://www.ietf.org/proceedings/91/slides/slides-91-mpls-13.pptx

We very much appreciate the work done by everyone involved. And believe
it will form a good base to move ahead on.

At the end of the presentation the relation of this work to generic
yang-attempts were brought up. The answer was pretty much that we do
not know yet.

The YANG teams are not formalized working group design teams. We will
need to see the effects of getting the rtg-area tuning fully in place
first.

For the time being they are individual initiatives, pretty much as an
individual draft, however the output from the teams are there out in the
open and can be discussed, and will serve as a basis if and when we
decide on design teams.

The coordination points that can be seen now, and what the teams should
be aware of and take into consideration.

High level OAM model (LIME)
   - probably not that much impact on MPLS TE and LDP yang models

Generic TE model
   - it is likely that this will be done in teas
   - but that mpls data palne specifics will go to mpls
   - the MPLS TE yang team should be aware of this

LDP model
   - likely to stay (mostly) in MPLS

Routing-area coordination
    - Qin Wu and Dave Sinicrope is the coordinators for this, and the
      teams should coordinate as necessary.


With that the current (individual) yang teams should keep up the
good work and wait for the other pieces fall into place.

/Loa
for the mpls wg chairs

PS

Tarek,

Can you copy this to all members of the yang teams




-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


From nobody Fri Nov 28 07:10:46 2014
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Multiprotocol Label Switching Working Group of the IETF.

        Title           : Carrying PIM-SM in ASM mode Trees over P2MP mLDP LSPs
        Authors         : Yakov Rekhter
                          Rahul Aggarwal
                          Nicolai Leymann
                          Wim Henderickx
                          Quintin Zhao
                          Richard Li
	Filename        : draft-ietf-mpls-pim-sm-over-mldp-03.txt
	Pages           : 12
	Date            : 2014-11-28

Abstract:
   When IP multicast trees created by PIM-SM in Any Source Multicast
   (ASM) mode need to pass through an MPLS domain, it may be desirable
   to map such trees to Point-to-Multipoint Label Switched Paths. This
   document describes how to accomplish this in the case where such
   Point-to-Multipoint Label Switched Paths are established using Label
   Distribution Protocol Extensions for Point-to-Multipoint and
   Multipoint-to-Multipoint Label Switched Paths Multipoint LDP (mLDP).


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From nobody Sat Nov 29 17:36:27 2014
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Multiprotocol Label Switching Working Group of the IETF.

        Title           : Label Switched Path (LSP) Ping/Trace Multipath Support for Link Aggregation Group (LAG) Interfaces
        Authors         : Nobo Akiya
                          George Swallow
                          Stephane Litkowski
                          Bruno Decraene
                          John E. Drake
	Filename        : draft-akiya-mpls-lsp-ping-lag-multipath-04.txt
	Pages           : 22
	Date            : 2014-11-29

Abstract:
   This document defines an extension to the MPLS Label Switched Path
   (LSP) Ping and Traceroute as specified in RFC 4379.  The extension
   allows the MPLS LSP Ping and Traceroute to discover and exercise
   specific paths of Layer 2 (L2) Equal-Cost Multipath (ECMP) over Link
   Aggregation Group (LAG) interfaces.

   This document updates RFC4379 and RFC6424.



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From nobody Sat Nov 29 17:49:19 2014
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From: "Nobo Akiya (nobo)" <nobo@cisco.com>
To: "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] I-D Action: draft-akiya-mpls-lsp-ping-lag-multipath-04.txt
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Subject: Re: [mpls] I-D Action: draft-akiya-mpls-lsp-ping-lag-multipath-04.txt
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Dear MPLS WG,

There was number of comments provided by Loa Andersson (thanks Loa!), so we=
 have made changes to address those comments prior to requesting the chairs=
 to start the WG adoption poll of this document.

The modifications do not make any technical changes, but improved the clari=
ty/readability of the document.

I'd like to highlight that this document makes improvements to LSP Ping/Tra=
ce because usage of following approach does not help.

- A problem is detected in a layer X.
- Let's drop down a layer and trouble shoot the layer (X-1) to further diag=
nose.

Such approach has benefits and will be able to find number of problem, but =
it won't catch all the problems, unfortunately.

Some aspects of good troubleshooting of layer X can only be done on layer X=
 by having the visibility of the lower layer.

For those who has limited time, here's the pointer to the presentation of t=
his document at IEtF90.

http://www.ietf.org/proceedings/90/slides/slides-90-mpls-4.pdf

Thanks!

-Nobo, on behalf of authors

> -----Original Message-----
> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of internet-
> drafts@ietf.org
> Sent: Saturday, November 29, 2014 8:36 PM
> To: i-d-announce@ietf.org
> Cc: mpls@ietf.org
> Subject: [mpls] I-D Action: draft-akiya-mpls-lsp-ping-lag-multipath-04.tx=
t
>=20
>=20
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
>  This draft is a work item of the Multiprotocol Label Switching Working
> Group of the IETF.
>=20
>         Title           : Label Switched Path (LSP) Ping/Trace Multipath =
Support for
> Link Aggregation Group (LAG) Interfaces
>         Authors         : Nobo Akiya
>                           George Swallow
>                           Stephane Litkowski
>                           Bruno Decraene
>                           John E. Drake
> 	Filename        : draft-akiya-mpls-lsp-ping-lag-multipath-04.txt
> 	Pages           : 22
> 	Date            : 2014-11-29
>=20
> Abstract:
>    This document defines an extension to the MPLS Label Switched Path
>    (LSP) Ping and Traceroute as specified in RFC 4379.  The extension
>    allows the MPLS LSP Ping and Traceroute to discover and exercise
>    specific paths of Layer 2 (L2) Equal-Cost Multipath (ECMP) over Link
>    Aggregation Group (LAG) interfaces.
>=20
>    This document updates RFC4379 and RFC6424.
>=20
>=20
>=20
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-akiya-mpls-lsp-ping-lag-multipath/
>=20
> There's also a htmlized version available at:
> http://tools.ietf.org/html/draft-akiya-mpls-lsp-ping-lag-multipath-04
>=20
> A diff from the previous version is available at:
> http://www.ietf.org/rfcdiff?url2=3Ddraft-akiya-mpls-lsp-ping-lag-multipat=
h-
> 04
>=20
>=20
> Please note that it may take a couple of minutes from the time of
> submission until the htmlized version and diff are available at tools.iet=
f.org.
>=20
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls


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Subject: [mpls] I-D Action: draft-ietf-mpls-oam-ipv6-rao-01.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Multiprotocol Label Switching Working Group of the IETF.

        Title           : IPv6 Router Alert Option for MPLS OAM
        Authors         : Kamran Raza
                          Nobo Akiya
                          Carlos Pignataro
	Filename        : draft-ietf-mpls-oam-ipv6-rao-01.txt
	Pages           : 5
	Date            : 2014-11-30

Abstract:
   RFC 4379 defines the MPLS LSP Ping/Traceroute mechanism, in which the
   Router Alert Option MUST be set in the IP header of the MPLS Echo
   Request messages, and may conditionally be set in the IP header of
   the MPLS Echo Reply messages depending on the Reply Mode used.  While
   a generic "Router shall examine packet" Option Value is used for the
   IPv4 Router Alert Option (RAO), there is no generic Router Alert
   Option Value defined for IPv6 that can be used.  This document
   allocates a new generic IPv6 Router Alert Option Value that can be
   used by MPLS OAM tools, including the MPLS Echo Request and MPLS Echo
   Reply messages for MPLS in IPv6 environments.  Consequently, it
   updates RFC 4379.

   The initial motivation to request an IPv6 Router Alert Option (RAO)
   code point for MPLS OAM comes from MPLS LSP Ping/Traceroute.
   However, this code point is applicable to all MPLS OAM and not
   limited to MPLS LSP Ping/Traceroute.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-oam-ipv6-rao/

There's also a htmlized version available at:
http://tools.ietf.org/html/draft-ietf-mpls-oam-ipv6-rao-01

A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-oam-ipv6-rao-01


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


From nobody Sun Nov 30 13:16:23 2014
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Multiprotocol Label Switching Working Group of the IETF.

        Title           : IPv6 Router Alert Option for MPLS OAM
        Authors         : Kamran Raza
                          Nobo Akiya
                          Carlos Pignataro
	Filename        : draft-ietf-mpls-oam-ipv6-rao-02.txt
	Pages           : 5
	Date            : 2014-11-30

Abstract:
   RFC 4379 defines the MPLS LSP Ping/Traceroute mechanism, in which the
   Router Alert Option MUST be set in the IP header of the MPLS Echo
   Request messages, and may conditionally be set in the IP header of
   the MPLS Echo Reply messages depending on the Reply Mode used.  While
   a generic "Router shall examine packet" Option Value is used for the
   IPv4 Router Alert Option (RAO), there is no generic Router Alert
   Option Value defined for IPv6 that can be used.  This document
   allocates a new generic IPv6 Router Alert Option Value that can be
   used by MPLS OAM tools, including the MPLS Echo Request and MPLS Echo
   Reply messages for MPLS in IPv6 environments.  Consequently, it
   updates RFC 4379.

   The initial motivation to request an IPv6 Router Alert Option (RAO)
   code point for MPLS OAM comes from MPLS LSP Ping/Traceroute.
   However, this code point is applicable to all MPLS OAM and not
   limited to MPLS LSP Ping/Traceroute.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-oam-ipv6-rao/

There's also a htmlized version available at:
http://tools.ietf.org/html/draft-ietf-mpls-oam-ipv6-rao-02

A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-oam-ipv6-rao-02


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


From nobody Sun Nov 30 19:18:00 2014
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Message-ID: <547BDDD9.3080704@pi.nu>
Date: Mon, 01 Dec 2014 11:17:45 +0800
From: Loa Andersson <loa@pi.nu>
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Cc: "mpls-chairs@tools.ietf.org" <mpls-chairs@tools.ietf.org>, "draft-kini-mpls-spring-entropy-label@tools.ietf.org" <draft-kini-mpls-spring-entropy-label@tools.ietf.org>
Subject: Re: [mpls] poll to se if we have consensus to make draft-kini-mpls-spring-entropy-label an mpls wg document
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"Working Group,

The poll for adoption of draft-kini-mpls-spring-entropy-label is
closed.

We have found that there is a good support for adopting the draft as
an MPLS wg document. We also have a fair number of comments, that we'd
like to see addressed before making it a wg document.

We have therefore asked the authors to work with the reviewers and
re-spin an updated version of the document.

/Loa
for the MPLS wg chairs"

On 2014-11-12 03:46, Loa Andersson wrote:
> Working Group,
>
> This is to start a two week poll on adopting
> draft-kini-mpls-spring-entropy-label as an MPLS working group document.
>
> Please send your comments (support/not support) to the mpls working
> group mailing list (mpls@ietf.org). Please give a technical
> motivation for your support/not support, especially if you think that
> the document should not be adopted as a working group document.
>
> There is no IPR disclosures directly against this document.
>
> The authors has all stated on the working group mailing
> list that they are unaware of any IPR claims against this draft.
>
> However we have an outstanding issue on IPRs. There were more than
> one solution to entropy labels for spring, they are referenced in the
> document, but are labeled as "discounted". One of these proposed
> had an IPR disclosure.
>
> However if you are on the the mpls working group mailing list and
> aware of IPR that relates to this draft, the time to disclose
> this is now.
>
> This poll ends November 25, 2014.
>
> /Loa

-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64

