
From nobody Mon Jun  1 00:47:43 2015
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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'Dongjie \(Jimmy\)'" <jie.dong@huawei.com>, <mpls@ietf.org>
References: <014501d097d3$2886a230$7993e690$@olddog.co.uk> <76CD132C3ADEF848BD84D028D243C92757D5387B@nkgeml512-mbx.china.huawei.com>
In-Reply-To: <76CD132C3ADEF848BD84D028D243C92757D5387B@nkgeml512-mbx.china.huawei.com>
Date: Mon, 1 Jun 2015 08:47:17 +0100
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Cc: 'Loa Andersson' <loa@mail01.huawei.com>
Subject: Re: [mpls] New I-D draft-vainshtein-mpls-gal-tc-ttl-handling-00.txt
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Thanks.
Typo is fixed in our master XML.

Adrian

> -----Original Message-----
> From: Dongjie (Jimmy) [mailto:jie.dong@huawei.com]
> Sent: 01 June 2015 03:59
> To: adrian@olddog.co.uk; mpls@ietf.org
> Cc: 'Loa Andersson'
> Subject: RE: [mpls] New I-D draft-vainshtein-mpls-gal-tc-ttl-handling-00.txt
> 
> Hi authors,
> 
> I think this draft is useful and makes things clear.
> 
> One minor nit in section 3.3:
> s/apply equally all possible uses/apply equally to all possible uses
> 
> Best regards,
> Jie
> 
> > -----Original Message-----
> > From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Adrian Farrel
> > Sent: Wednesday, May 27, 2015 12:44 AM
> > To: mpls@ietf.org
> > Cc: 'Loa Andersson'
> > Subject: [mpls] New I-D draft-vainshtein-mpls-gal-tc-ttl-handling-00.txt
> >
> > Hi,
> >
> > Sasha, Loa, and I put together a short draft to clarify behavior wrt the TTL
and
> > TC fields of the label stack entry that contains the GAL.
> >
> > Nothing dramatic, just tightening things up for a few issues reported to us
from
> > implementation/interop/field.
> >
> > Review and comments actively sought.
> >
> > Adrian
> >
> > > -----Original Message-----
> > > From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
> > > Sent: 26 May 2015 17:37
> > > To: Loa Andersson; Alexander Vainshtein; Adrian Farrel; Adrian Farrel;
> > > Sasha Vainshtein; Loa Andersson
> > > Subject: New Version Notification for
> > > draft-vainshtein-mpls-gal-tc-ttl-handling-
> > > 00.txt
> > >
> > >
> > > A new version of I-D, draft-vainshtein-mpls-gal-tc-ttl-handling-00.txt
> > > has been successfully submitted by Adrian Farrel and posted to the
> > > IETF repository.
> > >
> > > Name:		draft-vainshtein-mpls-gal-tc-ttl-handling
> > > Revision:	00
> > > Title:		Handling the TC and TTL fields in a Label Stack Entry
when
> the
> > > Generic Associated Channel Label is Present
> > > Document date:	2015-05-26
> > > Group:		Individual Submission
> > > Pages:		6
> > > URL:
> > https://www.ietf.org/internet-drafts/draft-vainshtein-mpls-gal-tc-ttl-
> > > handling-00.txt
> > > Status:
> > https://datatracker.ietf.org/doc/draft-vainshtein-mpls-gal-tc-ttl-
> > > handling/
> > > Htmlized:
> > https://tools.ietf.org/html/draft-vainshtein-mpls-gal-tc-ttl-handling-
> > > 00
> > >
> > >
> > > Abstract:
> > >    This document clarifies handling of the Traffic Class (TC) and Time-
> > >    to-Live (TTL) fields of a Label Stack Entry that contains the Generic
> > >    Associated Channel (G-ACh) Label (GAL).  These clarifications are
> > >    intended to aid interoperability of implementations.
> > >
> > >    Original handling was defined in RFC 5586, and this document updates
> > >    that RFC.
> > >
> > >
> > >
> > >
> > > 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
> >
> > _______________________________________________
> > mpls mailing list
> > mpls@ietf.org
> > https://www.ietf.org/mailman/listinfo/mpls


From nobody Mon Jun  1 01:26:47 2015
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Subject: [mpls] Fwd: Nomcom 2015-2016: Second call for volunteers
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Folks,

Please volunteer if you can, the NomCom is very important.

/Loa
mpls wg co-chair


-------- Forwarded Message --------
Subject: Nomcom 2015-2016: Second call for volunteers
Date: Sun, 31 May 2015 02:26:47 -0700
From: NomCom Chair 2015 <nomcom-chair-2015@ietf.org>
Reply-To: ietf@ietf.org
To: IETF Announcement List <ietf-announce@ietf.org>


The IETF nomcom appoints folks to fill the open slots on the IAOC, the IAB,
and the IESG.

Ten voting members for the nomcom are selected in a verifiably random
way from a pool of volunteers. The more volunteers, the better chance we
have of choosing a random yet representative cross section of the IETF
population.

The details of the operation of the nomcom can be found in RFC 7437,
and BCP10/RFC3797 details the selection algorithm.

Volunteers must have attended 3 of the past 5 IETF meetings.  As specified
in RFC 7437, that means three out of the five past meetings up to the time
this email announcement goes out to start the solicitation of volunteers.
The five meetings out of which you must have attended *three*
are:

IETF 88 (Vancouver), \
          89 (London),       \
          90 (Toronto),         *** ANY THREE!
          91 (Honolulu),     /
          92 (Dallas)        /

If you qualify, please volunteer.   However, much as we want this, before
you decide to volunteer, please be sure you are willing to forgo appointment
to any of the positions for which this nomcom is responsible.


As of today, we have 121 confirmed volunteers. 45 of those who ticked the
box at the Dallas IETF meeting and are deemed qualified have still not
responded; 81 people who ticked the box have been contacted because we could
not verify their qualification; of those, 8 have confirmed that they are not
qualified.

Thank you for volunteering!

The list of people and posts whose terms end with the March 2016 IETF
meeting, and thus the positions for which this nomcom is responsible, are

IAOC:
No terms expire at this time.

IAB:
Mary Barnes
Joe Hildebrand
Ted Hardie
Erik Nordmark
Brian Trammell
Marc Blanchet

IESG:
Alissa Cooper (ART)
Barry Leiba (ART)
Brian Haberman (Internet)
Benoit Claise (Operations and Management)
Alia Atlas (Routing)
Kathleen Moriarty (Security)
Martin Stiemerling (Transport)

The Applications  and Real-Time (ART) area is the expected new area
resulting from the merge of the APP and RAI areas.
All appointments are for 2 years.
The ART and Routing areas have 3 ADs and the General area has 1; all 
other areas have 2 ADs.
Thus, all areas have at least one continuing AD.


The primary activity for this nomcom will begin in July 2015 and should be
completed in January 2016.   The nomcom will have regularly scheduled
conference calls to ensure progress. (We might dogfood WebRTC)
There will be activities to collect requirements from the community, review
candidate questionnaires, review feedback from community members about
candidates, and talk to candidates.

Thus, being a nomcom member does require some time commitment; but it is 
also
a very rewarding experience.

It is very important that you be able to attend IETF94 (Yokohama) to 
conduct interviews.
Being at IETF93 (Prague) is useful for orientation.  Being at IETF95 is 
not essential.

Please volunteer by sending me an email before 11:59 pm CET (UTC +2 hours)
June 22, 2015, as follows:

To: nomcom-chair-2015@ietf.org
Subject: Nomcom 2015-16 Volunteer

Please include the following information in the email body:

Your Full Name: __________
     // as you write it on the IETF registration form
Current Primary Affiliation:
     // Typically what goes in the Company field
     // in the IETF Registration Form
Emails: _______________
    // All email addresses used to register for the past 5 IETF meetings
    // Preferred email address first
Telephone: _______________________
     // For confirmation if selected

You should expect an email response from me within 3 business days stating
whether or not you are qualified.  If you don't receive this response,
please re-send your email with the tag "RESEND"" added to the subject line.

If you are not yet sure if you would like to volunteer, please consider
that nomcom members play a very important role in shaping the leadership
of the IETF.  Questions by email or voice are welcome.
Volunteering for the nomcom is a great way to contribute to the IETF!

You will find a detailed timeline on the nomcom web site at:
     https://datatracker.ietf.org/nomcom/2015/

I will be publishing a more detailed target timetable, as well as details
of the randomness seeds to be used for the RFC 3797 selection process,
within the next couple weeks.

Thank you!
Harald Alvestrand
hta+nomcom@alvestrand.no
nomcom-chair-2015@ietf.org


=====  qualified volunteers so far, in alphabetical order by first name

Adam Montville
Adrian Farrel
ANDREW Dolganow
Andrew Newton
Andy Bierman
ANM Zaheduzzaman Sarker
Anoop Ghanwani
Anthony Nadalin
Ari Keranen
Benno Overeinder
Bing Liu
Borje Ohlman
Cengiz Alaettinoglu
Charles Eckel
Charles Perkins
Chris Bowers
Christer Holmberg
Christian O'Flaherty
Cong Liu
Cullen Jennings
Damien Saucez
Daniele Ceccarelli
David Lamparter
David Mandelberg
Dean Bogdanovic
Derek Atkins
Dhruv Dhody
Donald Eastlake 3rd
Edward Lemon
Eliot Lear
Emil Ivov
Eric Gray
Eric Vyncke
Fernando Gont
Fred Baker
George Michaelson
George Swallow
Georgios Karagiannis
Gonzalo Salgueiro
Gregory Mirsky
Hannes Gredler
Huaimo Chen
Ignas Bagdonas
Jason Weil
Jean-Marc Valin
Jesus Maria Martin Garcia
Joel Halpern
John Bradley
John Brzozowski
John Mattsson
John Scudder
Jon Hudson
jouni korhonen
Karen O'Donoghue
Keith Moore
Keyur Patel
Larry Masinter
Laurent Ciavaglia
Lee Howard
Liang Xia
Linda Dunbar
Lixia Zhang
Luigi Iannone
Mach CHEN
Magnus Westerlund
Mark Townsley
Matthew Bocci
Matthew Lepinski
Mehmet Ersue
Michael Jones
Michael StJohns
nalini elkins
Nancy Cam-Winget
Niel Harper
Ning Kong
Ning Zong
Ole Jacobsen
Ole Trøan
Pål-Erik Martinsen
Pascal Thubert
Patrick McManus
Paul Wouters
Peter Koch
Peter Yee
QIN WU
Rich Salz
Richard Barnes
Robby Simpson
Ron Bonica
Ross Callon
Salvatore Loreto
Sam K. Aldrin
Sanjay Mishra
Scott Mansfield
Sheng Jiang
SHUCHENG LIU
Simon Perreault
Sri Gundavelli
Stephan Wenger
Stephen Kent
Steve Olshansky
Steven Wright
Suhas Nandakumar
Suresh Krishnan
Susan Hares
Thomas Nadeau
Tim Wicinski
Timothy Terriberry
Tina (Ting) Tsou (Zou)
Tobias Gondrom
Toerless Eckert
Tomohiro Fujisaki
Tony Hansen
Uma Chunduri
Vijay Gurbani
Warren Kumari
Wassim Haddad
Wijnands IJsbrand
Yi Zhao
Yizhou Li
Yuanlong Jiang





From nobody Mon Jun  1 05:26:05 2015
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Cc: draft-farrelll-mpls-opportunistic-encrypt@tools.ietf.org, mpls@ietf.org, mpls-chairs@tools.ietf.org, 'secdir' <secdir@ietf.org>
Subject: Re: [mpls] [secdir] FYI - Early review of draft-farrelll-mpls-opportunistic-encrypt
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Hi Charlie,

I've finally gotten around to the detail of this as we get ready
to shoot out a -05 addressing the mpls review team comments and
your security review. (And thanks to you and the mpls-rt folks
for the good comments.)

On 29/05/15 19:57, Adrian Farrel wrote:
> Charlie,
> 
> Thanks for this. Forgive me for stumbling through the security aspects: I'm sure
> Stephen will pick me up on whatever I get wrong.
> 
>> All--
>> Draft-farrelll-mpls-opportunistic-encrypt-04 specifies the details of a
>> protocol for doing opportunistic encryption of MPLS connections. It permits
>> encryption at any of two scopes: between adjacent Label Switching Routers
>> (LSRs) on an MPLS Label Switched Path (LSP), and/or between end points of an
>> LSP. Opportunistic encryption in this case means that there is no mechanism
>> specified for authenticating the endpoints of the encrypted channel. The two
>> endpoints do an anonymous Diffie-Hellman exchange and use the resulting key
>> to encrypt the connection. The protocol is not protected from a
>> man-in-the-middle attack (though some mechanisms for detecting such an
>> attack after the fact are suggested and a keying infrastructure could be
>> added later).
>>
>> The encryption aspects of the protocol seem well thought out and
>> appropriate. The question at hand is whether to adopt this document as a
>> working group document and it easily meets that bar (at least from a
>> security standpoint). I have a number of questions about operational aspects
>> of the protocol (perhaps due to my limited understanding of MPLS) and I have
>> some suggestions for enhancements that will probably be necessary eventually
>> and might be easier to make before there is widespread deployment:
>>
>> There is an issue that came up in the design of IKEv2 that may be an issue
>> here as well. I don't know whether MPLS connections are bi-directional or
>> whether separate connections need to be established in the two directions.
>>
>> If they are bi-directional, then there are race conditions that can occur if
>> both ends attempt to initialize a connection simultaneously and there must
>> be some tie-breaking mechanism to assure that exactly one of the connection
>> attempts succeeds. If they are uni-directional, and if the connection is
>> always initialized by the sending end, then this is not a problem (though it
>> is replaced with the problem that messages of this protocol sent in the
>> reverse direction cannot be tunneled over the MPLS connection). (This
>> document seems to imply that MPLS connections can be either uni-directional
>> or bi-directional, but I don't understand MPLS well enough to have
>> understood it). Even if the connections are bi-directional, it will make
>> your life simpler if you use different symmetric keys in the two directions.
>> This can be done easily by getting two independent keys from the key
>> expansion process.
> 
> Right. LSPs may be unidirectional or bidirectional.
> 
> Section 4 and particularly 4.3 describe how the return path is selected for the
> case of a unidirectional LSP.
> 
> So we have four questions:
> 
> 1. Is the return path secure?
> 2. Who initiates the use of OS?
> 3. How do we handle race conditions?
> 4. Should we have different keys in different directions?
> 
> In fact, the key exchange does not itself need to be secure, but it would be
> better if it was. 4.2.1 and 4.4 say how to do this if possible, but notes it
> will likely not be possible in the case of OS. So that's Q1.
> 
> In the case of a unidirectional LSP, only the source node (i.e. upstream from
> the perspective of data flow) can be the initiator for the key exchange because
> the key exchange requires the use of a message flowing on the LSP itself. So,
> for Q2 we only have to worry about bidirectional LSPs, and that takes us to Q3.
> 
> But, in fact, a bidirectional LSP is in fact (from the point of view of the
> forwarding plane) the association of two unidirectional LSPs. The association
> may be so tight (in the control plane or the management plane, and with fate
> sharing) that the LSP is referred to as *a* single bidirectional LSP, but that
> doesn't change the forwarding plane behavior. And, indeed, in the bidirectional
> case, there is no reason to not have encryption in one direction and not in the
> other direction (except, of course, that more is better :-).  So that means that
> each direction of the bidirectional LSP is responsible for initiating its own
> OS. 
> 
> Hence Q3 is not a problem, and Q4 takes care of itself.
> 
> We should definitely clarify this in the draft (and thank you for making me
> describe it here), but I'd like some more discussion with the WG to check I am
> right about this.

Yep, some more mpls-clue would help me on the directionality thing
too, but I think Adrian's answers are good. In particular, regardless
of all else, we will definitely not end up allowing the same symmetric
key in both directions as that would permit reflection attacks. The
current version doesn't have that bad properly and I'll make sure that
we don't introduce it. To be complete: I think the LSP ID is different
for both directions and that is an input to the KDF, as are the LSR
IDs whose order will differ. So I don't think we can currently end
up with the same symmetric key used in two directions with the current
draft.

> 
>> A second issue relates to algorithm negotiation. While the protocol allows
>> for any of the crypto algorithms to be replaced, and the algorithms are
>> indicated on the wire, it does not appear to allow for a smooth upgrade
>> where the two ends are updated independently and everything must continue
>> to work when only one end has been updated. To accomplish that, there
>> should be an algorithm negotiation (as takes place in IKE and TLS) where one
>> end presents a list of algorithms is can support and the other end chooses the
>> algorithms it prefers. A simpler variation would be for a responder to be
>> able to reject the algorithms assumed by the initiator and send back a list
>> of algorithms it will accept. Note: it's possible that MPLS already operates
>> with the restriction that the two ends of a connection must be consistent
>> and operations will halt if the two ends are updated non-simultaneously. If
>> that's true, then adding crypto doesn't make the situation any worse and it
>> would be acceptable to continue to operate that way.
> 
> I'm so far from being an expert in this matter that I am probably making a fool
> of myself (again), but is algorithm replacement actually any different from key
> change? That is, the key negotiation protocol negotiates the key and algorithm
> to use and so can also negotiate changes in both key and algorithm. 
> 
> Section 4.2.3 mentions this, but is exceptionally week. I'll add some text
> (assuming what I just wrote is not complete lunacy).
> The key ID identifies the key and the algorithm in one field, so being able to
> change the key ID was intended to also allow changing the algorithm.

Right, we are here assuming that any algorithm negotiation is done
via some management system that is not defined by the basic mechanism,
i.e. not here. I think that's reasonable as that same management system
would be the place where someone decides whether and when to try use OS,
so handling those aspects of algorithm agility at that stage seems
better.

It's probably also worth noting that since the symmetric crypto here
is very likely to have to be in h/w for performance reasons, this is
not quite the same as cases where a s/w update might introduce a new
algorithm nor is it that likely that a single node supports many
algorithms given the fairly severe performance constraints that apply,
i.e. line rates of N x 10G generally.

>> A possible problem with Key Identifiers: the Key Identifier is only 4 bits
>> long, which should be sufficient because at most two keys should be active
>> at any given time. The Key Identifier, however, is chosen effectively
>> randomly, which means that one time in 16 it will be the same as the Key
>> Identifier it is replacing. While the protocol could be modified to do
>> something special in that last (like adding one to the Key Identifier if it
>> matches the previous value or redoing the key negotiation in that case), it
>> would probably be better to get the Key-ID from the key expansion when
>> there is no previous connection and add one (mod 16) when rekeying.
> 
> Yes, I had assumed that if the key ID was reselected then some form of secondary
> choice would be made. Not sure that the predictability of simply adding one is
> good idea (not that I can think of  specific associated risk).

Yep, adding one (mod 16) until no more collision or throwing an
error if all 16 are used already or similar is needed. I've added
that.

> 
>> There is mention of the possibility of reusing g^i and g^r between
>> connections. Some crypto purists would object to that, but I wouldn't. If
>> you want to allow implementations that option, however, you should also
>> include in the exchange nonce values Ni and Nr that are not reused between
>> connections rather than depending on unique values for the other parameters
>> to prevent reuse of keys.
> 
> Ah, hmm, OK.
> Stephen?
> Help!

Sure. For now, I added a RECOMMENDATION to use fresh i & r every time
and a ref to RFC4086. I think the recommendation should stay the same
as we don't ever need to do loads of key agreements in a hurry afaik.

But the phrasing of that may change e.g. if we adopt Curve25519 later
or if CFRG or the TLS WG produce guidance on re-use of DH public values
that's more detailed. (The most common case of such re-use for TLS I
think so I'd expect better guidance on this to come from TLS1.3 or CFRG,
and we should just point at whichever of those is best as we go along.)

> 
>> In section 3.5 (MTU considerations), I suspect you may be underestimating
>> the effect on MTU. I believe AES_GCM_128 always adds between 1 and 16 pad
>> bytes to make the encrypted payload size a multiple of 16 bytes. There are
>> algorithm variants that do not add any padding, but they are somewhat
>> controversial and difficult to implement in hardware. Further, the total
>> overhead will be dependent of the crypto algorithm chosen, and the text
>> should indicate that so that readers don't assume that there is some maximum
>> number of bytes that can be wired into protocols that run above this.
> 
> That's helpful.
> Stephen, I need you to help with this.

For our initial MTI, I believe we need to pick the same symmetric
cipher and mode that is already supported by h/w that is used for
MACsec as that exists, meets the performance requirements and is
at least somewhat deployed.

That implies that the overhead is probably only as much as problem
as it already is for MACsec, since we're just changing the layer
that sees that overhead. If one runs this and MACsec there could be
fun though, yes.

In any case, we do note the data expansion so the WG and implementers
will deal with that as we go. I do not think we'd be wise to try to
be innovative here with modes of operation, at least not at first. And
if new modes with better properties do turn out to be needed, that
could be defined later on.

> 
>> I would suggest that most or all of sections 5 and 7 should be moved to
>> Security Considerations. Failing that, the Security Considerations section
>> should reference them.
> 
> Thanks. Since 5 is growing, I've put  back pointer from 6.
> 7.1 is already referenced from 6.2 and 6.3

Yep, I think we'll need to do some editorial surgery later as we
accumulate new bits and pieces of text. The same is true for the
introductory material in section 2 - given we've now published
RFC7435, a lot of that should probably disappear before we're
done. (But is worth keeping for now probably.)

Thanks again for the review.

Cheers,
Stephen.

PS: Adrian and I are nearly done on a -05 version reflecting all
these reviews.

> 
>> Typos:
>>
>> P4: "and if may be advisable" -> "and it may be advisable"
>> P4: "an alternative key derivation functions" -> "alternative key derivation
>> functions"
>> P5: "key definition function" -> "key derivation function"
>> P5: "attck vecotrs" -> "attack vectors"
>> P5: "descirption" -> "description"
>> P19: "opostie" -> "opposite"
> 
> Good.
> 
> vmt
> Adrian
> 
> _______________________________________________
> secdir mailing list
> secdir@ietf.org
> https://www.ietf.org/mailman/listinfo/secdir
> wiki: http://tools.ietf.org/area/sec/trac/wiki/SecDirReview
> 


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Changed milestone "++ Progress draft-ietf-mpls-lsp-ping-registry to
publication", resolved as "Done".

URL: https://datatracker.ietf.org/wg/mpls/charter/


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Subject: [mpls] RFC 7552 on Updates to LDP for IPv6
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A new Request for Comments is now available in online RFC libraries.

        
        RFC 7552

        Title:      Updates to LDP for IPv6 
        Author:     R. Asati, C. Pignataro,
                    K. Raza, V. Manral,
                    R. Papneja
        Status:     Standards Track
        Stream:     IETF
        Date:       June 2015
        Mailbox:    rajiva@cisco.com, 
                    cpignata@cisco.com, 
                    skraza@cisco.com,
                    vishwas@ionosnetworks.com, 
                    rajiv.papneja@huawei.com
        Pages:      24
        Characters: 48801
        Updates:    RFC 5036, RFC 6720

        I-D Tag:    draft-ietf-mpls-ldp-ipv6-17.txt

        URL:        https://www.rfc-editor.org/info/rfc7552

        DOI:        http://dx.doi.org/10.17487/RFC7552

The Label Distribution Protocol (LDP) specification defines
procedures to exchange label bindings over either IPv4 or IPv6
networks, or both.  This document corrects and clarifies the LDP
behavior when an IPv6 network is used (with or without IPv4).  This
document updates RFCs 5036 and 6720.

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 memo is unlimited.

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From nobody Fri Jun  5 00:15:15 2015
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Subject: [mpls] Closed - Re: Poll to see if we have consensus adopting draft-bonica-mpls-self-ping as an MPLS wg document
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Working Group,

This has been closed. We have a new working group document.

Could the authors please post the document as
draft-ietf-mpls-self-ping-00
without any other changes than the administrative information,
file name, version number and dates.

/Loa
for the mpls wg chairs

On 2015-05-20 11:55, Loa Andersson wrote:
> Working Group,
>
> This is to start a two week poll on adopting draft-bonica-mpls-self-
> ping-06 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 one IPR disclosures directly against this document. All the
> authors has stated on the working group mailing that they are unaware of
> any undisclosed IPRs against this document.
>
> 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 June 5, 2015.
>
> /Loa

-- 


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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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           : LSP Self-Ping
        Authors         : Ravi Torvi
                          Ron Bonica
                          Ina Minei
                          Michael Conn
                          Dante Pacella
                          Luis Tomotaki
                          Mark Wygant
	Filename        : draft-ietf-mpls-self-ping-00.txt
	Pages           : 11
	Date            : 2015-06-05

Abstract:
   When certain RSVP-TE optimizations are implemented, ingress LSRs can
   receive RSVP RESV messages before forwarding state has been installed
   on all downstream nodes.  According to the RSVP-TE specification, the
   ingress LSR can forward traffic through an LSP as soon as it receives
   a RESV message.  However, if the ingress LSR forwards traffic through
   the LSP before forwarding state has been installed on all downstream
   nodes, traffic can be lost.

   This memo describes LSP Self-ping.  When an ingress LSR receives an
   RESV message, it can invoke LSP Self-ping procedures to ensure that
   forwarding state has been installed on all downstream nodes.

   LSP Self-ping is an extremely light-weight mechanism.  It does not
   consume control plane resources on transit or egress LSRs.



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

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


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Subject: [mpls] I-D Action: draft-ietf-mpls-self-ping-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           : LSP Self-Ping
        Authors         : Ravi Torvi
                          Ron Bonica
                          Ina Minei
                          Michael Conn
                          Dante Pacella
                          Luis Tomotaki
                          Mark Wygant
	Filename        : draft-ietf-mpls-self-ping-01.txt
	Pages           : 11
	Date            : 2015-06-05

Abstract:
   When certain RSVP-TE optimizations are implemented, ingress LSRs can
   receive RSVP RESV messages before forwarding state has been installed
   on all downstream nodes.  According to the RSVP-TE specification, the
   ingress LSR can forward traffic through an LSP as soon as it receives
   a RESV message.  However, if the ingress LSR forwards traffic through
   the LSP before forwarding state has been installed on all downstream
   nodes, traffic can be lost.

   This memo describes LSP Self-ping.  When an ingress LSR receives an
   RESV message, it can invoke LSP Self-ping procedures to ensure that
   forwarding state has been installed on all downstream nodes.

   LSP Self-ping is an extremely light-weight mechanism.  It does not
   consume control plane resources on transit or egress LSRs.



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

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-mpls-self-ping-01

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-self-ping-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.

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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'Loa Andersson'" <loa@pi.nu>, <mpls@ietf.org>, <mpls-chairs@tools.ietf.org>, <draft-ietf-mpls-lsp-ping-relay-reply@tools.ietf.org>, "'BRUNGARD, DEBORAH A'" <db3546@att.com>
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Subject: Re: [mpls] MPLS working group last call on	draft-ietf-mpls-lsp-ping-relay-reply
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Hi,

Just being a good citizen and reviewing this I-D during WG last call.
I didn't have much time so I only found a number of nits most of which
are probably not significant.

Cheers,
Adrian

---

idnits notes the presence of a pre-RFC5378 disclaimer. Do you really 
need that?

---

Abstract


You expand "LSR" correctly, but not on first use.

---

Abstract

   a replying LSR may not have the available route to the
   initiator

s/the/an/

---

Section 1

You need to expand "LSR" on first use.

---

Section 1

   This document describes the extensions to the Label Switched Path
   (LSP) Ping as specified in [RFC4379], by adding a relayed echo reply
   mechanism which could be used to detect data plane failures for the
   inter autonomous system (AS) and inter-area LSPs. 

s/the extensions/extensions/
s/detect/report/ ???
s/for the/for/

---

Section 1

Delete "The extensions are to update the [RFC4379]." as it duplicates
the previous sentence.

---

Section 1

   may not have the available route

s/the/an/

---

Section 2

   LSP Ping [RFC4379] defines a mechanism to detect the data plane
   failures and localize faults. 

s/the data/data/

---

Section 2

OLD
   using an UDP packet with
   the IPv4/IPv6 address of the originating LSR
NEW
   using a UDP packet with
   the IPv4/IPv6 destination address set to an address of the
   LSR that originated the Echo Request.

---

Section 2

OLD
   IP addresses reachability are allowed
NEW
   IP address reachability is allowed

---

Section 2

OLD
   In fact, it
   is almost uniformly the case that in inter-AS scenarios, it is not
   allowed the distribution or direct routing to the IP addresses of any
   of the nodes other than the ASBR in another AS.
NEW
   In fact, it
   is almost always the case that in inter-AS scenarios the only node in
   one AS to which direct routing is allowed from the other AS is the 
   ASBR, and routing information from within one AS is not distributed 
   into another AS.

---

Section 2

   Figure 1 demonstrates a case where one LSP is set up between PE1 and

s/one/an/

---

Section 2

You should expand "AN" on first use.

---

Section 3

   A new TLV named Relay Node Address Stack TLV is defined in this
   document, to carry the IP addresses of the possible relay nodes for
   the replying LSR.

In what way are they "possible" relay nodes? The description of the
mechanism seems to say that these addresses must be used an in the
supplied order.

---

Section 3.1 and onwards

It would help IANA if you distinguished your two instances of "TBD" by
using "TBD1", "TBD2", and "TBD3".

---

Section 3.2

It looks to me that you intend that the address list can include 
addresses of mixed types (otherwise you would not need the address
type in each entry). However, your offset is provided as a counter
and that means that each time this list is processed, the list must
be walked from top down since each entry may be of a different length.
Thus, while the stack is optimized for stripping unwanted addresses 
from the end of the TLV, it is as suboptimal as you could have made it
for parsing because every node that processes the TLV must scan every
entry in the list.

Why not replace the count of addresses with a count of octets to enable
quicker access into the list?

---

Section 3.2

   K bit: if the K bit is set to 1, then this sub-TLV MUST be kept in
   Relay Node Address Stack during TLV compress process described in
   section 4.2.

The address stack entry is not a sub-TLV.

I am inferring from this text that set to 0 the K bit indicates that the
address stack entry can be kept in or left out at will, but actually 4.2
gives some considerably more complex rules for stripping or not 
stripping when k=0. Perhaps you need...

   K bit: if the K bit is set to 1, then this address stack entry MUST
   NOT be stripped from the Relay Node Address Stack during processing
   described in Section 4.2. If the K bit is clear, the entry might be
   stripped according to the processing described in Section 4.2.

---

Section 3.3 seems very "sudden". It doesn't seem to be related to this
document in particular. It is true that the presence of a Relay Node 
Address Stack TLV increases the size of the Echo Reply (or Relayed
Echo Reply) message, but presumably the problem with exceeding the
MTU is only exacerbated by, not caused by, this TLV.

Furthermore, section 3.3 talks about dropping TLVs (or sending them 
with length zero), but gives no hints about which should or can be 
dropped to get the MTU down to size. For example, dropping the Relay
Node Address Stack TLV would presumably be frowned upon.

Lastly, I cannot understand how the new return code is handled when
some other return code is also demanded.

Maybe there is text missing from section 4. All I could find was the
last paragraph of 4.2.

---

Section 4.1

   In addition to the procedures described in section 4.3 of [RFC4379],
   a Relay Node Address Stack TLV MUST be carried in the Echo Request
   message to facilitate the relay functionality.

This is ambiguous. The update to 4379 is not that the new TLV must be 
included in the echo request in order to facilitate the relay 
functionality. I think you mean that you have defined an optional TLV
that can be included in an echo request message to facilitate the relay
functionality, and that where that functionality is needed in order to
relay echo reply messages, the new TLV must be included in the echo
request message.

---

Section 4.1

   The source UDP port field MUST be set
   to the source UDP port.

There is no "source UDP port" field. Perhaps the "Initiator Source Port"
field?

But also, this text is quite confusing. The text in 3.2 is much clearer.

---

Section 4.1 appears to lack guidance about how to construct a Relay Node
Address Stack TLV to include in an Echo Request message. One may cross-
reference to 4.6 and then a lot becomes clear (including the processes 
in 4.2 that otherwise appear convoluted!).

I believe that what you have in mind is that before you can do end-to-
end LSP ping, you must perform a traceroute in order to collect and
construct the full Relay Node Address Stack TLV. Shouldn't the document
make this clear?

---

Section 4.2

   An LSR that does not recognize the Relay Node Address Stack TLV,
   SHOULD ignore it as per section 3 of [RFC4379].

You are not seeking to change 4379 behavior here, so using 2119 SHOULD
is confusing. Indeed, you cannot change legacy behavior in this 
document. 

I think you need...
                                                                
   The Type of the Relay Node Address Stack TLV is chosen from the range
   32768 to 49161 so that (per section 3 of [RFC4379]) an LSR that does
   not recognize the TLV knows that the TLV is optional and can safely
   ignore it.

---

I tried to work out how things would pan out if two ASes on the path 
used the same address space within their AS. Would an address appear in
the stack and seem to be routable when it is really an address in the
other AS?

---

4.3 has

   If the first IP address in the Relay Node Address Stack TLV is not
   the next relay node address

There are two questions that follow:
- You have a "SHOULD" to resolve this "if". What are the conditions for
  varying that behavior?
- You don't say what to do if this "if" is not satisfied. Presumably, in
  this case it sends an Echo Reply and you can address my question with
  a pointer to 4.5.

Similarly, 4.4 has:

   If the next relay node address is not the first one in the address
   list, i.e., another intermediate relay node, the relay node MUST send
   an Relayed Echo Reply message to the determined upstream node with
   the payload unchanged other than the Relay Node Address Stack TLV.

If this "if" does not hold, what does the implementation do? Again, a 
pointer to 4.5 may be enough.

---

The third case in 4.5 is when the receiver does not understand the TLV
and ignores it. In this case it will send an Echo Reply without itself
including the TLV.

---

Section 6 should note that the new TLV provides a way for Echo Reply
messages to be diverted so that information can be collected. For
example, if a stack entry can be inserted, the Echo Reply messages can
be caused to transit another AS unrelated to the LSP under test. Since
the Echo Reply reveals path information about the LSP, this is a
valuable attack.  Having said that, you can say how this TLV is 
protected in the Echo Reply message.
> -----Original Message-----
> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson
> Sent: 27 May 2015 10:21
> To: mpls@ietf.org; mpls-chairs@tools.ietf.org; draft-ietf-mpls-lsp-ping-relay-
> reply@tools.ietf.org; BRUNGARD, DEBORAH A
> Subject: [mpls] MPLS working group last call on
draft-ietf-mpls-lsp-ping-relay-
> reply
> 
> Working Group,
> 
> This is to initiate a two week working group last call on
> draft-ietf-mpls-lsp-ping-relay-reply.
> 
> Please send your comments to the mpls wg mailing list (mpls@ietf.org).
> 
> There are two IPR disclosures against this document. All the authors
> and contributors have stated on the working group mailing list that
> they are not aware of any other IPRs that relates to this draft.
> 
> This working group last call ends June 10, 2015.
> 
> A little bit of background. We requested publication for this draft
> earlier, but very late in the process it was discovered that the
> document needed more work - and it was returned to the working group.
> Document has been updated, and you can find a diff:
> 
> https://www.ietf.org/rfcdiff?url1=draft-ietf-mpls-lsp-ping-relay-reply-
> 05&url2=draft-ietf-mpls-lsp-ping-relay-reply-09
> 
> A discussion on the updates can be found at:
> http://www.ietf.org/proceedings/92/slides/slides-92-mpls-8.pdf
> 
> /Loa
> for the MPLS wg chairs
> --
> 
> 
> 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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Yes, support.

Lizhong

-----Original Message-----
> Message: 1
> Date: Wed, 20 May 2015 11:55:41 +0200
> From: Loa Andersson <loa@pi.nu>
> To: "mpls@ietf.org" <mpls@ietf.org>,
> 	"draft-bonica-mpls-self-ping@tools.ietf.org"
> 	<draft-bonica-mpls-self-ping@tools.ietf.org>,
> 	"mpls-chairs@tools.ietf.org" <mpls-chairs@tools.ietf.org>
> Subject: [mpls] Poll to see if we have consensus adopting
> 	draft-bonica-mpls-self-ping as an MPLS wg document
> Message-ID: <555C5A1D.7020709@pi.nu>
> Content-Type: text/plain; charset=utf-8; format=flowed
> 
> Working Group,
> 
> This is to start a two week poll on adopting draft-bonica-mpls-self-
> ping-06 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 one IPR disclosures directly against this document. All the
authors has
> stated on the working group mailing that they are unaware of any
undisclosed
> IPRs against this document.
> 
> 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 June 5, 2015.
> 
> /Loa
> --
> 
> 
> Loa Andersson                        email: loa@mail01.huawei.com
> Senior MPLS Expert                          loa@pi.nu
> Huawei Technologies (consultant)     phone: +46 739 81 21 64
> 
> 
> 
> ------------------------------
> 
> Subject: Digest Footer
> 
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
> 
> 
> ------------------------------
> 
> End of mpls Digest, Vol 133, Issue 19
> *************************************


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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: "Osborne, Eric" <eric.osborne@level3.com>, Lucy yong <lucy.yong@huawei.com>, "draft-mirsky-mpls-residence-time@tools.ietf.org" <draft-mirsky-mpls-residence-time@tools.ietf.org>, "mpls-chairs@tools.ietf.org" <mpls-chairs@tools.ietf.org>
Thread-Topic: MPLS_RT review of draft-mirsky-mpls-residence-time-06.txt
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Subject: Re: [mpls] MPLS_RT review of draft-mirsky-mpls-residence-time-06.txt
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--_002_7347100B5761DC41A166AC17F22DF1121B9B33B8eusaamb103erics_
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Hi Eric,
many thanks for your thorough review and very helpful comments. We greatly =
appreciate your suggestions and some already in next version we're preparin=
g. Please find some notes in-line and tagged GIM>>.

	Regards,
		Greg

-----Original Message-----
From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Osborne, Eric
Sent: Tuesday, May 26, 2015 6:45 AM
To: Lucy yong; draft-mirsky-mpls-residence-time@tools.ietf.org; mpls-chairs=
@tools.ietf.org
Cc: mpls@ietf.org
Subject: Re: [mpls] MPLS_RT review of draft-mirsky-mpls-residence-time-06.t=
xt

I finally had some time to read this draft as well.  I agree with Lucy's ge=
neral comments - this doc seems to achieve the goal it sets out.  Is it use=
ful?  Not to me.  It seems like it's maybe for mobile networks?  I'm not an=
 expert in the matter of timing so this review assumes that the actual timi=
ng procedures work.  My comments below are about how RTM fits into the larg=
er picture.


General question: does RTM work over LAGs?  They're a flavor of ECMP in som=
e respects.  If not, that needs to be spelled out somewhere.

It might be worth spending a few lines in the introduction talking about wh=
o might want to use this and what sort of restrictions it places on a netwo=
rk design.



Specific comments:

Section 4 talks about LDP and ECMP and the problems it causes.  It suggests=
 that one solution is to disable ECMP used for RTM LSPs.  This seems like i=
t would only make the problem worse; the more you separate the OAM path fro=
m the actual data path, the less useful your measurements are.  You may be =
far better off just saying "don't do RTM with MP2P LSPs".
GIM>> You're absolutely correct, value of RTM, like of all OAM, is when "in=
-line" rule been ensured. PTP is bi-directional and must be co-routed. If I=
P paths between A and B, when ECMP disabled, considered co-routed, then wou=
ldn't LDP LSPs between A and B be as well co-routed?

Section 4.1, "LSAs sent from an interface".  This doesn't line up with how =
link-state protocols work.  There should be no property of an LSA dependant=
 upon the interface that it's sent out (OK, modulo type 9 opaques and stuff=
).  I think this really wants to say "LSAs sent from a router which describ=
e a particular interface". =20
GIM>> Gladly taken in.


Section 4.5 could use a review from an ISIS expert.  I scanned the GENINFO =
TLV and it's not clear to me how RTM will associate a capability with a spe=
cific interface between peers.  What if I have several interfaces between A=
-B and only some of them support RTM?  I'm not saying this isn't covered, b=
ut that it's not clear to me as a casual reader of Section 4.5 and GENINFO.
GIM>> Thank you, will reach to ISIS WG for review.

Section 4.6, "egress LSR's egress interface".  So if I have


A---B---C---D---E---F

a TE LSP B->E and IP nodes A and F, is section 4.6 really referring to the =
E->F interface?


What if I have a TE LSP A->F?  Where's the 'egress LSR's egress interface'?
What if I have a TE LSP A->C, C->E and E->F?  Or LDP A->C, TE C->E, LDP E->=
F?

GIM>> Attached is slide to reflect the relationships and roles of nodes and=
 interfaces. The challenge is to turn it into ASCII-art. I'll give it a fai=
r try.



eric



> -----Original Message-----
> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Lucy yong
> Sent: Wednesday, May 06, 2015 6:39 PM
> To: draft-mirsky-mpls-residence-time@tools.ietf.org; mpls-=20
> chairs@tools.ietf.org
> Cc: mpls@ietf.org
> Subject: Re: [mpls] MPLS_RT review of=20
> draft-mirsky-mpls-residence-time- 06.txt
>=20
> Hi All,
>=20
> I reviewed draft-mirsky-mpls-residence-time as the member of MPLS=20
> Review Team and have the following comments:
>=20
> is the document coherent?
>=20
> Yes. It specifies how MPLS supports residence time measurement.
>=20
> is it useful (ie, is it likely to be actually useful in operational netwo=
rks)?
>=20
> The document claims that such measurement can improve the accuracy of=20
> clock synchronization across the network. I am not an operator and=20
> author and not sure how useful this feature provides compared to the=20
> complexity adding to.
>=20
> is the document technically sound?
> Yes. The draft provides a detail solution in control plane and data=20
> plane to achieve this purpose.
>=20
> is the document ready to be considered for WG adoption?
> Yes. The document states the problem clearly and provides a solution=20
> to address this problem.
>=20
> IMHO:  after adopting it as the WG draft, the WG should further=20
> evaluate if control plane and data plane solution can be simplified.=20
> The areas may be
> considered:
> 1) Do we have to use IGP to announce node RTM capability? Can RSVP-TE=20
> resolve the issue by itself?
> 2) Will possible to enhance RRO to serve RSO purpose instead of=20
> carrying both RRO and RSO in the message?
> 3) Since this feature is designed for the LSP that is used for clock=20
> synchronization, such LSPs are not majority, so it should be option in=20
> LSP setup. Make that very clear.
> 4) two-step clock mode is quite complex. The description in Section 7=20
> is not clear to me why this mode is necessary.
>=20
> Regards,
> Lucy
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls

_______________________________________________
mpls mailing list
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: Lucy yong <lucy.yong@huawei.com>, "draft-mirsky-mpls-residence-time@tools.ietf.org" <draft-mirsky-mpls-residence-time@tools.ietf.org>, "mpls-chairs@tools.ietf.org" <mpls-chairs@tools.ietf.org>
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From nobody Sun Jun  7 22:01:05 2015
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: Markus Jork <mjork@juniper.net>, "draft-mirsky-mpls-residence-time@tools.ietf.org" <draft-mirsky-mpls-residence-time@tools.ietf.org>, "mpls-chairs@tools.ietf.org" <mpls-chairs@tools.ietf.org>
Thread-Topic: MPLS_RT review of draft-mirsky-mpls-residence-time-06.txt
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Subject: Re: [mpls] MPLS_RT review of draft-mirsky-mpls-residence-time-06.txt
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Hi Markus,
thank you for your thorough review and very helpful comments. We're working=
 on the next version and will share with the reviewers by week's end. Pleas=
e find couple notes in-line and tagged GIM>>.

	Regards,
		Greg

-----Original Message-----
From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Markus Jork
Sent: Monday, May 18, 2015 8:07 PM
To: draft-mirsky-mpls-residence-time@tools.ietf.org; mpls-chairs@tools.ietf=
.org
Cc: mpls@ietf.org
Subject: Re: [mpls] MPLS_RT review of draft-mirsky-mpls-residence-time-06.t=
xt

I was asked to review draft-mirsky-mpls-residence-time-06.txt as part of th=
e review team process.

The document provides justification for why residence time measurement for =
MPLS LSPs may be useful and coherently describes the procedure for performi=
ng it. However, I could not understand the 2-step process from reading this=
 document.
GIM>> We'll keep on improving the text.

The proposed rsvp extensions look technically sound. Though I do question t=
he extra complexity introduced for keeping track of the RTM capable LSRs (u=
sing the RTM_SET object). While I generally understand the value in support=
ing incremental deployment of new features, I do wonder how much value ther=
e is in doing partial residence time measurements for random sub-sections o=
f an LSP? Are the incomplete measurements done in such a scenario really wo=
rth the added protocol complexity?
GIM>> We believe that incremental improvements are improvements nevertheles=
s and bring better quality of clock synchronization.

The document talks about the difficulties of applying the measurement proce=
dure to LDP networks due to ECMP. Maybe it should also discuss potential di=
fficulties with rsvp when there is link aggregation/bundling which could le=
ad to load-balancing over multiple egress interfaces?
GIM>> LAG may be better handled by the Conversation-sensitive frame collect=
ion and distribution section 6.6 in new revision of 802.1AX as likely to be=
 the case for PTP data. Will look into the link bundling.

I can't really comment on the usefulness of the document as I'm not familia=
r with the time synchronization protocols and use cases.
Under the assumption that partial residence time measurements for an LSP ar=
e useful, I think the document is ready for WG adoption.

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


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Archived-At: <http://mailarchive.ietf.org/arch/msg/mpls/548ph9Idwu7XPvqawpEP1LQaGMo>
Subject: Re: [mpls] review of draft-mirsky-mpls-residence-time
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Hi Yaakov,
greatly appreciate your most detailed review. We are looking forward to con=
tinue the discussion in Prague.

                Regards,
                                Greg

From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Yaakov Stein
Sent: Monday, May 25, 2015 10:11 PM
To: mpls@ietf.org
Subject: [mpls] review of draft-mirsky-mpls-residence-time

Loa asked me to comment on this draft before its acceptance as a MPLS WG dr=
aft.

As far as I understand, the purpose of this draft is to provide a form of w=
hat is called "on-path timing support" in the TICTOC WG.
The specific kind of on-path support is accumulation of residence times in =
LSRs which a time-sensitive flow traverses.
As such it is essentially the same as what is called "transparent clocking"=
 (TC) in IEEE 1588, and the draft indeed re-uses TC technologies.

However this draft attempts to remedy a problem with TC as presently implem=
ented - its layer violation.
This violation occurs since physical layer timing information is used to mo=
dify a field of a higher layer protocol.
The present draft remedies this by forcing hop-by-hop behavior by TTL field=
 manipulation,
but at the price of having to transport timing flows in the associated chan=
nel,
previously limited to OAM and control/management plane uses.

As such the draft elegantly solves a theoretical problem.

I am less sure that it solves a real-world problem, for the following reaso=
ns :

1. First is the fact that there is a simpler alternative for on-path suppor=
t of 1588 over MPLS that has already passed WG LC in TICTOC.
The existing TICTOC draft was purposely constrained
(following advice of reviewers who are MPLS experts)
to not touch the MPLS forwarding plane, while this draft defines GACh TLVs =
and sub-TLVs.
The present draft is admittedly much wider in applicability, but no use oth=
er than 1588 on-path support is described in the draft.

2. One conceivable use would be for highly accurate one-way delay estimatio=
n without synchronized clocks
(and I am not sure when this use is really needed).
Of course the present method only accounts for residence time in LSRs, not =
for propagation latencies on links (which 1588 can handle as well).
The methodology to overcome this limitation would assumably be to rely on a=
 co-routed round-trip, to us this draft to cancel residence times,
and then to measure the remaining round-trip time and divide by two.
However, existing algorithms do a pretty good job at cancelling residence t=
imes
except when the flow traverses a large number of network elements which are=
 heavily loaded with plesiochronously related interfering flows.
Do the authors have another use case in mind ?

3. The primary documented application for 1588 in telecom networks is cellu=
lar backhaul.
This application already has a plethora of solutions, based on GPS, 1588 ov=
er Ethernet with boundary clocks (BC), distributed grand masters, etc. etc.=
 etc.
Note that BC as widely deployed is already hop-by-hop, and in that way simi=
lar to this draft.
Is yet another solution really needed ?

4. Related to the previous questions is the issue of implementation in alre=
ady existing networks.
This solution requires hardware upgrades at least for the accurate time-sta=
mping and possibly for the accumulation and field modification
(although the latter may software upgrades, especially if 2-step correction=
 is utilized).
If we need to upgrade hardware, why not deploy BCs ?
A few years back I would have said that TC could be implemented in miniatur=
ized devices where BC could not,
but advances in miniaturization of OCXOs have severely reduced this advanta=
ge to cases where atomic-clock hold-over is required.

5. If another solution for this specific application is needed, is it neede=
d for MPLS ?
Cellular backhaul over carrier Ethernet is widely deployed, is cellular bac=
khaul over MPLS sufficiently widespread to merit this extension ?

6. MPLS does not define its own physical layer (which Ethernet does - the l=
ayer called ETY in the ITU).
As such it is not clear that MPLS is the right place to solve the timing di=
stribution problem.
MPLS necessarily runs over some physical layer which may already have on-pa=
th support, or may more economically support it.

All of the authors work for vendors - have these vendors implemented this o=
r do they plan implementing ?
If the answer is a resounding yes, then I assume that we will hear rebuttal=
s to most of the above remarks.

Regarding the content of the draft, I have a major issue with the use of th=
e term "Scratch Pad" for the correction field
(and BTW, it is sometimes called "Scratch Pad" and sometimes "ScratchPad" a=
nd sometimes "scratch pad").
This field is not some opaque meta-data transported by this newly defined h=
eader,
it is the very crux of the solution and requires manipulation to work.
Calling it a "scratch pad" (with any of the spellings) is tantamount to cal=
ling an MPLS label an "arbitrary bit-field".
Both terms may be technically correct, but hide the meaning of the field an=
d increase the load on reader in understanding the technology.

As an aside, the aforementioned TICTOC WG draft originally contained extens=
ions to OSPF, RSVP-TE, etc.
It was decided to separate the control extensions from the forwarding plane=
 draft, and to pursue each in the most appropriate WG.
It might be a good idea to do the same here.

One of the facts of life with on-path support of timing distribution is tha=
t it is often only partial.
What happens to this solution when there is only partial support?
I can imagine unrecognized GACh packets being booted to CPU in such cases, =
severely impacting uncompensated residence time.

Y(J)S


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<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Yaakov,<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">greatly appreciate you=
r most detailed review. We are looking forward to continue the discussion i=
n Prague.<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"color:#1F497D">&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Regard=
s,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&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; Greg<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;"> mpls [ma=
ilto:mpls-bounces@ietf.org]
<b>On Behalf Of </b>Yaakov Stein<br>
<b>Sent:</b> Monday, May 25, 2015 10:11 PM<br>
<b>To:</b> mpls@ietf.org<br>
<b>Subject:</b> [mpls] review of draft-mirsky-mpls-residence-time<o:p></o:p=
></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Loa asked me to comment on this draft before its acc=
eptance as a MPLS WG draft.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">As far as I understand, the purpose of this draft is=
 to provide a form of what is called &#8220;on-path timing support&#8221; i=
n the TICTOC WG.
<o:p></o:p></p>
<p class=3D"MsoNormal">The specific kind of on-path support is accumulation=
 of residence times in LSRs which a time-sensitive flow traverses.<o:p></o:=
p></p>
<p class=3D"MsoNormal">As such it is essentially the same as what is called=
 &#8220;transparent clocking&#8221; (TC) in IEEE 1588, and the draft indeed=
 re-uses TC technologies.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">However this draft attempts to remedy a problem with=
 TC as presently implemented &#8211; its layer violation.
<o:p></o:p></p>
<p class=3D"MsoNormal">This violation occurs since physical layer timing in=
formation is used to modify a field of a higher layer protocol.
<o:p></o:p></p>
<p class=3D"MsoNormal">The present draft remedies this by forcing hop-by-ho=
p behavior by TTL field manipulation,
<o:p></o:p></p>
<p class=3D"MsoNormal">but at the price of having to transport timing flows=
 in the associated channel,
<o:p></o:p></p>
<p class=3D"MsoNormal">previously limited to OAM and control/management pla=
ne uses.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">As such the draft elegantly solves a theoretical pro=
blem. <o:p>
</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I am less sure that it solves a real-world problem, =
for the following reasons :<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">1. First is the fact that there is a simpler alterna=
tive for on-path support of 1588 over MPLS that has already passed WG LC in=
 TICTOC.
<o:p></o:p></p>
<p class=3D"MsoNormal">The existing TICTOC draft was purposely constrained =
<o:p></o:p></p>
<p class=3D"MsoNormal">(following advice of reviewers who are MPLS experts)=
 <o:p></o:p></p>
<p class=3D"MsoNormal">to not touch the MPLS forwarding plane, while this d=
raft defines GACh TLVs and sub-TLVs.
<o:p></o:p></p>
<p class=3D"MsoNormal">The present draft is admittedly much wider in applic=
ability, but no use other than 1588 on-path support is described in the dra=
ft.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">2. One conceivable use would be for highly accurate =
one-way delay estimation without synchronized clocks
<o:p></o:p></p>
<p class=3D"MsoNormal">(and I am not sure when this use is really needed). =
<o:p></o:p></p>
<p class=3D"MsoNormal">Of course the present method only accounts for resid=
ence time in LSRs, not for propagation latencies on links (which 1588 can h=
andle as well).
<o:p></o:p></p>
<p class=3D"MsoNormal">The methodology to overcome this limitation would as=
sumably be to rely on a co-routed round-trip, to us this draft to cancel re=
sidence times,
<o:p></o:p></p>
<p class=3D"MsoNormal">and then to measure the remaining round-trip time an=
d divide by two.
<o:p></o:p></p>
<p class=3D"MsoNormal">However, existing algorithms do a pretty good job at=
 cancelling residence times
<o:p></o:p></p>
<p class=3D"MsoNormal">except when the flow traverses a large number of net=
work elements which are heavily loaded with plesiochronously related interf=
ering flows.<o:p></o:p></p>
<p class=3D"MsoNormal">Do the authors have another use case in mind ?<o:p><=
/o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">3. The primary documented application for 1588 in te=
lecom networks is cellular backhaul.
<o:p></o:p></p>
<p class=3D"MsoNormal">This application already has a plethora of solutions=
, based on GPS, 1588 over Ethernet with boundary clocks (BC), distributed g=
rand masters, etc. etc. etc.<o:p></o:p></p>
<p class=3D"MsoNormal">Note that BC as widely deployed is already hop-by-ho=
p, and in that way similar to this draft.<o:p></o:p></p>
<p class=3D"MsoNormal">Is yet another solution really needed ? <o:p></o:p><=
/p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">4. Related to the previous questions is the issue of=
 implementation in already existing networks.
<o:p></o:p></p>
<p class=3D"MsoNormal">This solution requires hardware upgrades at least fo=
r the accurate time-stamping and possibly for the accumulation and field mo=
dification
<o:p></o:p></p>
<p class=3D"MsoNormal">(although the latter may software upgrades, especial=
ly if 2-step correction is utilized).
<o:p></o:p></p>
<p class=3D"MsoNormal">If we need to upgrade hardware, why not deploy BCs ?=
 <o:p></o:p></p>
<p class=3D"MsoNormal">A few years back I would have said that TC could be =
implemented in miniaturized devices where BC could not,
<o:p></o:p></p>
<p class=3D"MsoNormal">but advances in miniaturization of OCXOs have severe=
ly reduced this advantage to cases where atomic-clock hold-over is required=
.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">5. If another solution for this specific application=
 is needed, is it needed for MPLS ?
<o:p></o:p></p>
<p class=3D"MsoNormal">Cellular backhaul over carrier Ethernet is widely de=
ployed, is cellular backhaul over MPLS sufficiently widespread to merit thi=
s extension ?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">6. MPLS does not define its own physical layer (whic=
h Ethernet does &#8211; the layer called ETY in the ITU).
<o:p></o:p></p>
<p class=3D"MsoNormal">As such it is not clear that MPLS is the right place=
 to solve the timing distribution problem.
<o:p></o:p></p>
<p class=3D"MsoNormal">MPLS necessarily runs over some physical layer which=
 may already have on-path support, or may more economically support it.<o:p=
></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">All of the authors work for vendors &#8211; have the=
se vendors implemented this or do they plan implementing ?
<o:p></o:p></p>
<p class=3D"MsoNormal">If the answer is a resounding yes, then I assume tha=
t we will hear rebuttals to most of the above remarks.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regarding the content of the draft, I have a major i=
ssue with the use of the term &#8220;Scratch Pad&#8221; for the correction =
field
<o:p></o:p></p>
<p class=3D"MsoNormal">(and BTW, it is sometimes called &#8220;Scratch Pad&=
#8221; and sometimes &#8220;ScratchPad&#8221; and sometimes &#8220;scratch =
pad&#8221;).
<o:p></o:p></p>
<p class=3D"MsoNormal">This field is not some opaque meta-data transported =
by this newly defined header,
<o:p></o:p></p>
<p class=3D"MsoNormal">it is the very crux of the solution and requires man=
ipulation to work.
<o:p></o:p></p>
<p class=3D"MsoNormal">Calling it a &#8220;scratch pad&#8221; (with any of =
the spellings) is tantamount to calling an MPLS label an &#8220;arbitrary b=
it-field&#8221;.
<o:p></o:p></p>
<p class=3D"MsoNormal">Both terms may be technically correct, but hide the =
meaning of the field and increase the load on reader in understanding the t=
echnology.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">As an aside, the aforementioned TICTOC WG draft orig=
inally contained extensions to OSPF, RSVP-TE, etc.<o:p></o:p></p>
<p class=3D"MsoNormal">It was decided to separate the control extensions fr=
om the forwarding plane draft, and to pursue each in the most appropriate W=
G.<o:p></o:p></p>
<p class=3D"MsoNormal">It might be a good idea to do the same here.<o:p></o=
:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">One of the facts of life with on-path support of tim=
ing distribution is that it is often only partial.<o:p></o:p></p>
<p class=3D"MsoNormal">What happens to this solution when there is only par=
tial support?
<o:p></o:p></p>
<p class=3D"MsoNormal">I can imagine unrecognized GACh packets being booted=
 to CPU in such cases, severely impacting uncompensated residence time.<o:p=
></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Y(J)S<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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From: "Osborne, Eric" <eric.osborne@level3.com>
To: Gregory Mirsky <gregory.mirsky@ericsson.com>, Lucy yong <lucy.yong@huawei.com>, "draft-mirsky-mpls-residence-time@tools.ietf.org" <draft-mirsky-mpls-residence-time@tools.ietf.org>, "mpls-chairs@tools.ietf.org" <mpls-chairs@tools.ietf.org>
Thread-Topic: MPLS_RT review of draft-mirsky-mpls-residence-time-06.txt
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Subject: Re: [mpls] MPLS_RT review of draft-mirsky-mpls-residence-time-06.txt
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...
trimmed, one comment
....=20
> Section 4 talks about LDP and ECMP and the problems it causes.  It sugges=
ts
> that one solution is to disable ECMP used for RTM LSPs.  This seems like =
it
> would only make the problem worse; the more you separate the OAM path
> from the actual data path, the less useful your measurements are.  You ma=
y
> be far better off just saying "don't do RTM with MP2P LSPs".
> GIM>> You're absolutely correct, value of RTM, like of all OAM, is when "=
in-
> line" rule been ensured. PTP is bi-directional and must be co-routed. If =
IP
> paths between A and B, when ECMP disabled, considered co-routed, then
> wouldn't LDP LSPs between A and B be as well co-routed?

I can't imagine disabling EMCP and running LDP.  That takes so much out of =
the network operator's toolbox.  But your customers may have different need=
s.
Even if you disable ECMP in LDP/IGP, you still have LAGs and other technlog=
ies.  Are you going to outlaw those too?  Again, what you want to do may wo=
rk for the people you want to do it to, but I've never worked in or with a =
network that could get away with single-path routing.




eric


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Date: Wed, 10 Jun 2015 00:09:45 +0800
From: "lizho.jin@gmail.com" <lizho.jin@gmail.com>
To: adrian <adrian@olddog.co.uk>, loa <loa@pi.nu>, mpls <mpls@ietf.org>,  mpls-chairs <mpls-chairs@tools.ietf.org>,  draft-ietf-mpls-lsp-ping-relay-reply <draft-ietf-mpls-lsp-ping-relay-reply@tools.ietf.org>,  db3546 <db3546@att.com>
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LmNvbQ0KPiBTZW5pb3IgTVBMUyBFeHBlcnQgICAgICAgICAgICAgICAgICAgICAgICAgIGxvYUBw
aS5udQ0KPiBIdWF3ZWkgVGVjaG5vbG9naWVzIChjb25zdWx0YW50KSAgICAgcGhvbmU6ICs0NiA3
MzkgODEgMjEgNjQNCj4gDQo+IF9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f
X19fX19fX19fDQo+IG1wbHMgbWFpbGluZyBsaXN0DQo+IG1wbHNAaWV0Zi5vcmcNCj4gaHR0cHM6
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	charset="ISO-8859-1"
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charse=
t=3DISO-8859-1"><style>body { line-height: 1.5; }blockquote { margin-top: =
0px; margin-bottom: 0px; margin-left: 0.5em; }body { font-size: 10.5pt; fo=
nt-family: 'Times New Roman'; color: rgb(0, 0, 0); line-height: 1.5; }body=
 { font-size: 10.5pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0);=
 line-height: 1.5; }</style></head><body>=0A<div><span></span>Hi Adrian,</=
div><div>Thank you for the review. Please see my reply inline below. Corre=
ct me if other authors have different opinion.</div><div>I will update the=
 draft after the end of last call.</div>=0A<div><br></div><hr style=3D"wid=
th: 210px; height: 1px;" color=3D"#b5c4df" size=3D"1" align=3D"left">=0A<d=
iv><span><div style=3D"MARGIN: 10px; FONT-FAMILY: verdana; FONT-SIZE: 10pt=
"><div>Regards</div><div>Lizhong</div></div></span></div>=0A<blockquote st=
yle=3D"margin-top: 0px; margin-bottom: 0px; margin-left: 0.5em;"><div>&nbs=
p;</div><div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3=
.0pt 0cm 0cm 0cm"><div style=3D"PADDING-RIGHT: 8px; PADDING-LEFT: 8px; FON=
T-SIZE: 12px;FONT-FAMILY:tahoma;COLOR:#000000; BACKGROUND: #efefef; PADDIN=
G-BOTTOM: 8px; PADDING-TOP: 8px"><div><b>From:</b>&nbsp;<a href=3D"mailto:=
adrian@olddog.co.uk">Adrian Farrel</a></div><div><b>Date:</b>&nbsp;2015-06=
-06&nbsp;00:34</div><div><b>To:</b>&nbsp;<a href=3D"mailto:loa@pi.nu">'Loa=
 Andersson'</a>; <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>; <a hr=
ef=3D"mailto:mpls-chairs@tools.ietf.org">mpls-chairs@tools.ietf.org</a>; <=
a href=3D"mailto:draft-ietf-mpls-lsp-ping-relay-reply@tools.ietf.org">draf=
t-ietf-mpls-lsp-ping-relay-reply@tools.ietf.org</a>; <a href=3D"mailto:db3=
546@att.com">'BRUNGARD, DEBORAH A'</a></div><div><b>Subject:</b>&nbsp;RE: =
[mpls] MPLS working group last call on	draft-ietf-mpls-lsp-ping-relay-repl=
y</div></div></div><div><div>Hi,</div>=0A<div>&nbsp;</div>=0A<div>Just bei=
ng a good citizen and reviewing this I-D during WG last call.</div>=0A<div=
>I didn't have much time so I only found a number of nits most of which</d=
iv>=0A<div>are probably not significant.</div>=0A<div>&nbsp;</div>=0A<div>=
Cheers,</div>=0A<div>Adrian</div>=0A<div>&nbsp;</div>=0A<div>---</div>=0A<=
div>&nbsp;</div>=0A<div>idnits notes the presence of a pre-RFC5378 disclai=
mer. Do you really </div>=0A<div>need that?</div><div>[Lizhong] this may n=
eed the answer from chairs and AD. We only follow the rules.</div>=0A<div>=
&nbsp;</div>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>Abstract</div>=0A=
<div>&nbsp;</div>=0A<div>&nbsp;</div>=0A<div>You expand "LSR" correctly, b=
ut not on first use.</div><div>[Lizhong] Good catch, thanks.</div>=0A<div>=
&nbsp;</div>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>Abstract</div>=0A=
<div>&nbsp;</div>=0A<div>&nbsp;&nbsp; a replying LSR may not have the avai=
lable route to the</div>=0A<div>&nbsp;&nbsp; initiator</div>=0A<div>&nbsp;=
</div>=0A<div>s/the/an/</div><div>[Lizhong] accept</div>=0A<div>&nbsp;</di=
v>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>Section 1</div>=0A<div>&nbs=
p;</div>=0A<div>You need to expand "LSR" on first use.</div><div>[Lizhong]=
 accept</div>=0A<div>&nbsp;</div>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<=
div>Section 1</div>=0A<div>&nbsp;</div>=0A<div>&nbsp;&nbsp; This document =
describes the extensions to the Label Switched Path</div>=0A<div>&nbsp;&nb=
sp; (LSP) Ping as specified in [RFC4379], by adding a relayed echo reply</=
div>=0A<div>&nbsp;&nbsp; mechanism which could be used to detect data plan=
e failures for the</div>=0A<div>&nbsp;&nbsp; inter autonomous system (AS) =
and inter-area LSPs. </div>=0A<div>&nbsp;</div>=0A<div>s/the extensions/ex=
tensions/</div>=0A<div>s/detect/report/ ???</div>=0A<div>s/for the/for/</d=
iv><div>[Lizhong] accept</div>=0A<div>&nbsp;</div>=0A<div>---</div>=0A<div=
>&nbsp;</div>=0A<div>Section 1</div>=0A<div>&nbsp;</div>=0A<div>Delete "Th=
e extensions are to update the [RFC4379]." as it duplicates</div>=0A<div>t=
he previous sentence.</div><div>[Lizhong] accept</div>=0A<div>&nbsp;</div>=
=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>Section 1</div>=0A<div>&nbsp;=
</div>=0A<div>&nbsp;&nbsp; may not have the available route</div>=0A<div>&=
nbsp;</div>=0A<div>s/the/an/</div><div>[Lizhong] accept</div>=0A<div>&nbsp=
;</div>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>Section 2</div>=0A<div=
>&nbsp;</div>=0A<div>&nbsp;&nbsp; LSP Ping [RFC4379] defines a mechanism t=
o detect the data plane</div>=0A<div>&nbsp;&nbsp; failures and localize fa=
ults. </div>=0A<div>&nbsp;</div>=0A<div>s/the data/data/</div><div>[Lizhon=
g] accept</div>=0A<div>&nbsp;</div>=0A<div>---</div>=0A<div>&nbsp;</div>=
=0A<div>Section 2</div>=0A<div>&nbsp;</div>=0A<div>OLD</div>=0A<div>&nbsp;=
&nbsp; using an UDP packet with</div>=0A<div>&nbsp;&nbsp; the IPv4/IPv6 ad=
dress of the originating LSR</div>=0A<div>NEW</div>=0A<div>&nbsp;&nbsp; us=
ing a UDP packet with</div>=0A<div>&nbsp;&nbsp; the IPv4/IPv6 destination =
address set to an address of the</div>=0A<div>&nbsp;&nbsp; LSR that origin=
ated the Echo Request.</div>=0A<div>&nbsp;<span style=3D"font-size: 10.5pt=
; line-height: 1.5; background-color: window;">[Lizhong] accept</span></di=
v><div><span style=3D"font-size: 10.5pt; line-height: 1.5; background-colo=
r: window;"><br></span></div>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>=
Section 2</div>=0A<div>&nbsp;</div>=0A<div>OLD</div>=0A<div>&nbsp;&nbsp; I=
P addresses reachability are allowed</div>=0A<div>NEW</div>=0A<div>&nbsp;&=
nbsp; IP address reachability is allowed</div>=0A<div>&nbsp;<span style=3D=
"font-size: 10.5pt; line-height: 1.5; background-color: window;">[Lizhong]=
 accept</span></div>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>Section 2=
</div>=0A<div>&nbsp;</div>=0A<div>OLD</div>=0A<div>&nbsp;&nbsp; In fact, i=
t</div>=0A<div>&nbsp;&nbsp; is almost uniformly the case that in inter-AS =
scenarios, it is not</div>=0A<div>&nbsp;&nbsp; allowed the distribution or=
 direct routing to the IP addresses of any</div>=0A<div>&nbsp;&nbsp; of th=
e nodes other than the ASBR in another AS.</div>=0A<div>NEW</div>=0A<div>&=
nbsp;&nbsp; In fact, it</div>=0A<div>&nbsp;&nbsp; is almost always the cas=
e that in inter-AS scenarios the only node in</div>=0A<div>&nbsp;&nbsp; on=
e AS to which direct routing is allowed from the other AS is the </div>=0A=
<div>&nbsp;&nbsp; ASBR, and routing information from within one AS is not =
distributed </div>=0A<div>&nbsp;&nbsp; into another AS.</div>=0A<div>&nbsp=
;<span style=3D"font-size: 10.5pt; line-height: 1.5; background-color: win=
dow;">[Lizhong] accept</span></div>=0A<div>---</div>=0A<div>&nbsp;</div>=
=0A<div>Section 2</div>=0A<div>&nbsp;</div>=0A<div>&nbsp;&nbsp; Figure 1 d=
emonstrates a case where one LSP is set up between PE1 and</div>=0A<div>&n=
bsp;</div>=0A<div>s/one/an/</div>=0A<div>[Lizhong] accept</div>=0A<div>---=
</div>=0A<div>&nbsp;</div>=0A<div>Section 2</div>=0A<div>&nbsp;</div>=0A<d=
iv>You should expand "AN" on first use.</div>=0A<div>&nbsp;<span style=3D"=
font-size: 10.5pt; line-height: 1.5; background-color: window;">[Lizhong] =
accept</span></div>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>Section 3<=
/div>=0A<div>&nbsp;</div>=0A<div>&nbsp;&nbsp; A new TLV named Relay Node A=
ddress Stack TLV is defined in this</div>=0A<div>&nbsp;&nbsp; document, to=
 carry the IP addresses of the possible relay nodes for</div>=0A<div>&nbsp=
;&nbsp; the replying LSR.</div>=0A<div>&nbsp;</div>=0A<div>In what way are=
 they "possible" relay nodes? The description of the</div>=0A<div>mechanis=
m seems to say that these addresses must be used an in the</div>=0A<div>su=
pplied order.</div><div>[Lizhong] the word&nbsp;<span style=3D"font-size: =
10.5pt; line-height: 1.5; background-color: window;">"possible" is not cor=
rectly used here. I will remove it.</span></div>=0A<div>&nbsp;</div>=0A<di=
v>---</div>=0A<div>&nbsp;</div>=0A<div>Section 3.1 and onwards</div>=0A<di=
v>&nbsp;</div>=0A<div>It would help IANA if you distinguished your two ins=
tances of "TBD" by</div>=0A<div>using "TBD1", "TBD2", and "TBD3".</div>=0A=
<div>&nbsp;<span style=3D"font-size: 10.5pt; line-height: 1.5; background-=
color: window;">[Lizhong] accept</span></div>=0A<div>---</div>=0A<div>&nbs=
p;</div>=0A<div>Section 3.2</div>=0A<div>&nbsp;</div>=0A<div>It looks to m=
e that you intend that the address list can include </div>=0A<div>addresse=
s of mixed types (otherwise you would not need the address</div>=0A<div>ty=
pe in each entry). However, your offset is provided as a counter</div>=0A<=
div>and that means that each time this list is processed, the list must</d=
iv>=0A<div>be walked from top down since each entry may be of a different =
length.</div>=0A<div>Thus, while the stack is optimized for stripping unwa=
nted addresses </div>=0A<div>from the end of the TLV, it is as suboptimal =
as you could have made it</div>=0A<div>for parsing because every node that=
 processes the TLV must scan every</div>=0A<div>entry in the list.</div>=
=0A<div>&nbsp;</div>=0A<div>Why not replace the count of addresses with a =
count of octets to enable</div>=0A<div>quicker access into the list?</div>=
<div>[Lizhong] either is OK. George has same preferrence for octets. I wil=
l</div><div>change to octets number across the document.</div>=0A<div>&nbs=
p;</div>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>Section 3.2</div>=0A<=
div>&nbsp;</div>=0A<div>&nbsp;&nbsp; K bit: if the K bit is set to 1, then=
 this sub-TLV MUST be kept in</div>=0A<div>&nbsp;&nbsp; Relay Node Address=
 Stack during TLV compress process described in</div>=0A<div>&nbsp;&nbsp; =
section 4.2.</div>=0A<div>&nbsp;</div>=0A<div>The address stack entry is n=
ot a sub-TLV.</div>=0A<div>&nbsp;</div>=0A<div>I am inferring from this te=
xt that set to 0 the K bit indicates that the</div>=0A<div>address stack e=
ntry can be kept in or left out at will, but actually 4.2</div>=0A<div>giv=
es some considerably more complex rules for stripping or not </div>=0A<div=
>stripping when k=3D0. Perhaps you need...</div>=0A<div>&nbsp;</div>=0A<di=
v>&nbsp;&nbsp; K bit: if the K bit is set to 1, then this address stack en=
try MUST</div>=0A<div>&nbsp;&nbsp; NOT be stripped from the Relay Node Add=
ress Stack during processing</div>=0A<div>&nbsp;&nbsp; described in Sectio=
n 4.2. If the K bit is clear, the entry might be</div>=0A<div>&nbsp;&nbsp;=
 stripped according to the processing described in Section 4.2.</div><div>=
[Lizhong] accepted, much clear now.</div>=0A<div>&nbsp;</div>=0A<div>---</=
div>=0A<div>&nbsp;</div>=0A<div>Section 3.3 seems very "sudden". It doesn'=
t seem to be related to this</div>=0A<div>document in particular. It is tr=
ue that the presence of a Relay Node </div>=0A<div>Address Stack TLV incre=
ases the size of the Echo Reply (or Relayed</div>=0A<div>Echo Reply) messa=
ge, but presumably the problem with exceeding the</div>=0A<div>MTU is only=
 exacerbated by, not caused by, this TLV.</div>=0A<div>&nbsp;</div>=0A<div=
>Furthermore, section 3.3 talks about dropping TLVs (or sending them </div=
>=0A<div>with length zero), but gives no hints about which should or can b=
e </div>=0A<div>dropped to get the MTU down to size. For example, dropping=
 the Relay</div>=0A<div>Node Address Stack TLV would presumably be frowned=
 upon.</div><div>[Lizhong] section 4.2 talks about this as below. How abou=
t to add a&nbsp;</div><div>reference in section 3.3?</div><div><span style=
=3D"font-family: &quot;" times=3D"" new=3D"" roman'";=3D"" font-size:=3D""=
 14px;=3D"" color:=3D"" rgb(0,=3D"" 0,=3D"" 0);=3D"" background-color:=3D"=
" rgba(0,=3D"" font-weight:=3D"" normal;=3D"" font-style:=3D"" normal;text=
-decoration:=3D"" none;'=3D"">&nbsp; &nbsp;If the full reply message would=
 exceed the MTU size, the Relay Node<br>   Address Stack TLV SHOULD be inc=
luded in the Echo Reply message (i.e.,<br>   other optional TLVs are exclu=
ded).</span></div>=0A<div>&nbsp;</div>=0A<div>Lastly, I cannot understand =
how the new return code is handled when</div>=0A<div>some other return cod=
e is also demanded.</div><div>[Lizhong] I will add the following:</div><di=
v>In&nbsp;<span style=3D"font-size: 10.5pt; line-height: 1.5; background-c=
olor: window;">section 4.4 of [RFC4379], step 7 will be updated.&nbsp;</sp=
an></div><div><span style=3D"font-family: &quot;" times=3D"" new=3D"" roma=
n'";=3D"" font-size:=3D"" 14px;=3D"" color:=3D"" rgb(0,=3D"" 0,=3D"" 0);=
=3D"" background-color:=3D"" rgba(0,=3D"" font-weight:=3D"" normal;=3D"" f=
ont-style:=3D"" normal;text-decoration:=3D"" none;'=3D"">Before sending Ec=
ho Reply, the new packet size should be checked.</span></div><div><span st=
yle=3D"font-family: &quot;" times=3D"" new=3D"" roman'";=3D"" font-size:=
=3D"" 14px;=3D"" color:=3D"" rgb(0,=3D"" 0,=3D"" 0);=3D"" background-color=
:=3D"" rgba(0,=3D"" font-weight:=3D"" normal;=3D"" font-style:=3D"" normal=
;text-decoration:=3D"" none;'=3D"">If  Best-return-code is 3 ("Replying ro=
uter is an egress for=0Athe FEC at stack depth"),&nbsp;</span></div><div><=
span style=3D"font-family: &quot;" times=3D"" new=3D"" roman'";=3D"" font-=
size:=3D"" 14px;=3D"" color:=3D"" rgb(0,=3D"" 0,=3D"" 0);=3D"" background-=
color:=3D"" rgba(0,=3D"" font-weight:=3D"" normal;=3D"" font-style:=3D"" n=
ormal;text-decoration:=3D"" none;'=3D"">or 8 ("Label switched at stack-dep=
th"), and if the packet size exceeds MTU size, then<br></span></div><div><=
span style=3D"font-family: &quot;" times=3D"" new=3D"" roman'";=3D"" font-=
size:=3D"" 14px;=3D"" color:=3D"" rgb(0,=3D"" 0,=3D"" 0);=3D"" background-=
color:=3D"" rgba(0,=3D"" font-weight:=3D"" normal;=3D"" font-style:=3D"" n=
ormal;text-decoration:=3D"" none;'=3D"">Best-return-code is TBD3 ("<span s=
tyle=3D"font-family: &quot;" times=3D"" new=3D"" roman'";=3D"" font-size:=
=3D"" 14px;=3D"" color:=3D"" rgb(0,=3D"" 0,=3D"" 0);=3D"" background-color=
:=3D"" rgba(0,=3D"" font-weight:=3D"" normal;=3D"" font-style:=3D"" normal=
;text-decoration:=3D"" none;'=3D"">One or more TLVs not returned due to MT=
U size</span>")</span></div><div><span style=3D"font-family: &quot;" times=
=3D"" new=3D"" roman'";=3D"" font-size:=3D"" 14px;=3D"" color:=3D"" rgb(0,=
=3D"" 0,=3D"" 0);=3D"" background-color:=3D"" rgba(0,=3D"" font-weight:=3D=
"" normal;=3D"" font-style:=3D"" normal;text-decoration:=3D"" none;'=3D"">=
<br></span></div><div><span style=3D"font-family: &quot;" times=3D"" new=
=3D"" roman'";=3D"" font-size:=3D"" 14px;=3D"" color:=3D"" rgb(0,=3D"" 0,=
=3D"" 0);=3D"" background-color:=3D"" rgba(0,=3D"" font-weight:=3D"" norma=
l;=3D"" font-style:=3D"" normal;text-decoration:=3D"" none;'=3D""><br></sp=
an></div>=0A<div>Maybe there is text missing from section 4. All I could f=
ind was the</div>=0A<div>last paragraph of 4.2.</div>=0A<div>&nbsp;</div>=
=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>Section 4.1</div>=0A<div>&nbs=
p;</div>=0A<div>&nbsp;&nbsp; In addition to the procedures described in se=
ction 4.3 of [RFC4379],</div>=0A<div>&nbsp;&nbsp; a Relay Node Address Sta=
ck TLV MUST be carried in the Echo Request</div>=0A<div>&nbsp;&nbsp; messa=
ge to facilitate the relay functionality.</div>=0A<div>&nbsp;</div>=0A<div=
>This is ambiguous. The update to 4379 is not that the new TLV must be </d=
iv>=0A<div>included in the echo request in order to facilitate the relay <=
/div>=0A<div>functionality. I think you mean that you have defined an opti=
onal TLV</div>=0A<div>that can be included in an echo request message to f=
acilitate the relay</div>=0A<div>functionality, and that where that functi=
onality is needed in order to</div>=0A<div>relay echo reply messages, the =
new TLV must be included in the echo</div>=0A<div>request message.</div><d=
iv>[Lizhong] correct. Rephrased as below:</div><div><span style=3D"font-fa=
mily: &quot;" times=3D"" new=3D"" roman'";=3D"" font-size:=3D"" 14px;=3D""=
 color:=3D"" rgb(0,=3D"" 0,=3D"" 0);=3D"" background-color:=3D"" rgba(0,=
=3D"" font-weight:=3D"" normal;=3D"" font-style:=3D"" normal;text-decorati=
on:=3D"" none;'=3D"">In addition to the procedures described in section 4.=
3 of [RFC4379],<br>   a Relay Node Address Stack TLV MUST be carried in th=
e Echo Request<br>   message if the relay functionality is required.</span=
></div>=0A<div>&nbsp;</div>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>Se=
ction 4.1</div>=0A<div>&nbsp;</div>=0A<div>&nbsp;&nbsp; The source UDP por=
t field MUST be set</div>=0A<div>&nbsp;&nbsp; to the source UDP port.</div=
>=0A<div>&nbsp;</div>=0A<div>There is no "source UDP port" field. Perhaps =
the "Initiator Source Port"</div>=0A<div>field?</div>=0A<div>&nbsp;</div>=
=0A<div>But also, this text is quite confusing. The text in 3.2 is much cl=
earer.</div><div>[Lizhong] yes, should be:&nbsp;</div><div><span style=3D"=
font-size: 10.5pt; line-height: 1.5; background-color: window;">The source=
 UDP port field MUST be set</span><span style=3D"font-size: 10.5pt; line-h=
eight: 1.5; background-color: window;">&nbsp;to the i</span><span style=3D=
"font-size: 10.5pt; line-height: 1.5; background-color: window;">nitiator&=
nbsp;</span><span style=3D"background-color: window; font-size: 10.5pt; li=
ne-height: 1.5;">source port.</span></div>=0A<div>&nbsp;</div>=0A<div>---<=
/div>=0A<div>&nbsp;</div>=0A<div>Section 4.1 appears to lack guidance abou=
t how to construct a Relay Node</div>=0A<div>Address Stack TLV to include =
in an Echo Request message. One may cross-</div>=0A<div>reference to 4.6 a=
nd then a lot becomes clear (including the processes </div>=0A<div>in 4.2 =
that otherwise appear convoluted!).</div><div>[Lizhong] accept, will add r=
eference to 4.6.</div>=0A<div>&nbsp;</div>=0A<div>I believe that what you =
have in mind is that before you can do end-to-</div>=0A<div>end LSP ping, =
you must perform a traceroute in order to collect and</div>=0A<div>constru=
ct the full Relay Node Address Stack TLV. Shouldn't the document</div>=0A<=
div>make this clear?</div><div>[Lizhong] traceroute is not mandatory befor=
e ping. If operator has knowledge&nbsp;</div><div>of the relay nodes, the =
initiator could directly send ping with&nbsp;<span style=3D"font-size: 10.=
5pt; line-height: 1.5; background-color: window;">Relay Node&nbsp;</span><=
/div><div><span style=3D"font-size: 10.5pt; line-height: 1.5; background-c=
olor: window;">Address Stack TLV containing the already known relay nodes.=
</span></div>=0A<div>&nbsp;</div>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<=
div>Section 4.2</div>=0A<div>&nbsp;</div>=0A<div>&nbsp;&nbsp; An LSR that =
does not recognize the Relay Node Address Stack TLV,</div>=0A<div>&nbsp;&n=
bsp; SHOULD ignore it as per section 3 of [RFC4379].</div>=0A<div>&nbsp;</=
div>=0A<div>You are not seeking to change 4379 behavior here, so using 211=
9 SHOULD</div>=0A<div>is confusing. Indeed, you cannot change legacy behav=
ior in this </div>=0A<div>document. </div>=0A<div>&nbsp;</div>=0A<div>I th=
ink you need...</div>=0A<div>&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;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </div>=0A<div>&nbsp;&nbsp; The Type =
of the Relay Node Address Stack TLV is chosen from the range</div>=0A<div>=
&nbsp;&nbsp; 32768 to 49161 so that (per section 3 of [RFC4379]) an LSR th=
at does</div>=0A<div>&nbsp;&nbsp; not recognize the TLV knows that the TLV=
 is optional and can safely</div>=0A<div>&nbsp;&nbsp; ignore it.</div><div=
>[Lizhong] accept</div>=0A<div>&nbsp;</div>=0A<div>---</div>=0A<div>&nbsp;=
</div>=0A<div>I tried to work out how things would pan out if two ASes on =
the path </div>=0A<div>used the same address space within their AS. Would =
an address appear in</div>=0A<div>the stack and seem to be routable when i=
t is really an address in the</div>=0A<div>other AS?</div><div>[Lizhong] w=
e have an example in section 5. And address of P1 and P2 could be&nbsp;</d=
iv><div>same. In that&nbsp;<span style=3D"font-size: 10.5pt; line-height: =
1.5; background-color: window;">case, ASBR1 must&nbsp;</span><span style=
=3D"font-family: ''; font-size: 10.5pt; line-height: 1.5; background-color=
: window;">adds its&nbsp;</span><span style=3D"font-family: ''; font-size:=
 10.5pt; line-height: 1.5; background-color: window;">interface address fa=
cing ASBR2 with&nbsp;</span></div><div><span style=3D"font-family: ''; fon=
t-size: 10.5pt; line-height: 1.5; background-color: window;">the K bit set=
. Then relay reply will not be miss-routed.</span></div><div>&nbsp;</div>=
=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>4.3 has</div>=0A<div>&nbsp;</=
div>=0A<div>&nbsp;&nbsp; If the first IP address in the Relay Node Address=
 Stack TLV is not</div>=0A<div>&nbsp;&nbsp; the next relay node address</d=
iv>=0A<div>&nbsp;</div>=0A<div>There are two questions that follow:</div>=
=0A<div>- You have a "SHOULD" to resolve this "if". What are the condition=
s for</div>=0A<div>&nbsp; varying that behavior?</div>=0A<div>- You don't =
say what to do if this "if" is not satisfied. Presumably, in</div>=0A<div>=
&nbsp; this case it sends an Echo Reply and you can address my question wi=
th</div>=0A<div>&nbsp; a pointer to 4.5.</div><div>[Lizhong] accept. Will =
add the following:</div><div><span style=3D"font-family: &quot;" times=3D"=
" new=3D"" roman'";=3D"" font-size:=3D"" 14px;=3D"" color:=3D"" rgb(0,=3D"=
" 0,=3D"" 0);=3D"" background-color:=3D"" rgba(0,=3D"" font-weight:=3D"" n=
ormal;=3D"" font-style:=3D"" normal;text-decoration:=3D"" none;'=3D"">&nbs=
p; &nbsp;When the next relay node address is the first one in the address=
=0A<br>   list, please refer to section 4.5.&nbsp;<br></span></div>=0A<div=
>&nbsp;</div>=0A<div>Similarly, 4.4 has:</div>=0A<div>&nbsp;</div>=0A<div>=
&nbsp;&nbsp; If the next relay node address is not the first one in the ad=
dress</div>=0A<div>&nbsp;&nbsp; list, i.e., another intermediate relay nod=
e, the relay node MUST send</div>=0A<div>&nbsp;&nbsp; an Relayed Echo Repl=
y message to the determined upstream node with</div>=0A<div>&nbsp;&nbsp; t=
he payload unchanged other than the Relay Node Address Stack TLV.</div>=0A=
<div>&nbsp;</div>=0A<div>If this "if" does not hold, what does the impleme=
ntation do? Again, a </div>=0A<div>pointer to 4.5 may be enough.</div><div=
>[Lizhong] accept, will add the following:</div><div><span style=3D"font-f=
amily: &quot;" times=3D"" new=3D"" roman'";=3D"" font-size:=3D"" 14px;=3D"=
" color:=3D"" rgb(0,=3D"" 0,=3D"" 0);=3D"" background-color:=3D"" rgba(0,=
=3D"" font-weight:=3D"" normal;=3D"" font-style:=3D"" normal;text-decorati=
on:=3D"" none;'=3D"">&nbsp; &nbsp;When the next relay node address is the =
first one in the address=0A<br>   list, please refer to section 4.5.&nbsp;=
<br></span></div>=0A<div>&nbsp;</div>=0A<div>---</div>=0A<div>&nbsp;</div>=
=0A<div>The third case in 4.5 is when the receiver does not understand the=
 TLV</div>=0A<div>and ignores it. In this case it will send an Echo Reply =
without itself</div>=0A<div>including the TLV.</div><div>[Lizhong] the rec=
eiver is unable to send the Echo Reply, because it does</div><div>know the=
 destination IP address and UDP port number. So if the receiver</div><div>=
could not understand the TLV, then the relay message will be dropped.</div=
>=0A<div>&nbsp;</div>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>Section =
6 should note that the new TLV provides a way for Echo Reply</div>=0A<div>=
messages to be diverted so that information can be collected. For</div>=0A=
<div>example, if a stack entry can be inserted, the Echo Reply messages ca=
n</div>=0A<div>be caused to transit another AS unrelated to the LSP under =
test. Since</div>=0A<div>the Echo Reply reveals path information about the=
 LSP, this is a</div>=0A<div>valuable attack.&nbsp; Having said that, you =
can say how this TLV is </div>=0A<div>protected in the Echo Reply message.=
</div><div>[Lizhong] Do you mean the new TLV could be used to collect path=
 information</div><div>unrelated to the LSP under test? This is not true. =
Only the node along the LSP&nbsp;</div><div>will add path information into=
 the new TLV. The relay node in the new TLV</div><div>will only relay the =
Echo Reply to the initiator, and will not add information to</div><div>the=
 new TLV.</div><div><br></div><div><br></div>=0A<div>&gt; -----Original Me=
ssage-----</div>=0A<div>&gt; From: mpls [mailto:mpls-bounces@ietf.org] On =
Behalf Of Loa Andersson</div>=0A<div>&gt; Sent: 27 May 2015 10:21</div>=0A=
<div>&gt; To: mpls@ietf.org; mpls-chairs@tools.ietf.org; draft-ietf-mpls-l=
sp-ping-relay-</div>=0A<div>&gt; reply@tools.ietf.org; BRUNGARD, DEBORAH A=
</div>=0A<div>&gt; Subject: [mpls] MPLS working group last call on</div>=
=0A<div>draft-ietf-mpls-lsp-ping-relay-</div>=0A<div>&gt; reply</div>=0A<d=
iv>&gt; </div>=0A<div>&gt; Working Group,</div>=0A<div>&gt; </div>=0A<div>=
&gt; This is to initiate a two week working group last call on</div>=0A<di=
v>&gt; draft-ietf-mpls-lsp-ping-relay-reply.</div>=0A<div>&gt; </div>=0A<d=
iv>&gt; Please send your comments to the mpls wg mailing list (mpls@ietf.o=
rg).</div>=0A<div>&gt; </div>=0A<div>&gt; There are two IPR disclosures ag=
ainst this document. All the authors</div>=0A<div>&gt; and contributors ha=
ve stated on the working group mailing list that</div>=0A<div>&gt; they ar=
e not aware of any other IPRs that relates to this draft.</div>=0A<div>&gt=
; </div>=0A<div>&gt; This working group last call ends June 10, 2015.</div=
>=0A<div>&gt; </div>=0A<div>&gt; A little bit of background. We requested =
publication for this draft</div>=0A<div>&gt; earlier, but very late in the=
 process it was discovered that the</div>=0A<div>&gt; document needed more=
 work - and it was returned to the working group.</div>=0A<div>&gt; Docume=
nt has been updated, and you can find a diff:</div>=0A<div>&gt; </div>=0A<=
div>&gt; https://www.ietf.org/rfcdiff?url1=3Ddraft-ietf-mpls-lsp-ping-rela=
y-reply-</div>=0A<div>&gt; 05&amp;url2=3Ddraft-ietf-mpls-lsp-ping-relay-re=
ply-09</div>=0A<div>&gt; </div>=0A<div>&gt; A discussion on the updates ca=
n be found at:</div>=0A<div>&gt; http://www.ietf.org/proceedings/92/slides=
/slides-92-mpls-8.pdf</div>=0A<div>&gt; </div>=0A<div>&gt; /Loa</div>=0A<d=
iv>&gt; for the MPLS wg chairs</div>=0A<div>&gt; --</div>=0A<div>&gt; </di=
v>=0A<div>&gt; </div>=0A<div>&gt; Loa Andersson&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; email: loa@mail01.huawei.com</div>=
=0A<div>&gt; Senior MPLS Expert&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; loa@pi.nu</div>=0A<div>&gt; Huawei Techn=
ologies (consultant)&nbsp;&nbsp;&nbsp;&nbsp; phone: +46 739 81 21 64</div>=
=0A<div>&gt; </div>=0A<div>&gt; __________________________________________=
_____</div>=0A<div>&gt; mpls mailing list</div>=0A<div>&gt; mpls@ietf.org<=
/div>=0A<div>&gt; https://www.ietf.org/mailman/listinfo/mpls</div>=0A<div>=
&nbsp;</div>=0A</div></blockquote>=0A</body></html>
------=_001_NextPart813257474700_=------



From nobody Thu Jun 11 02:19:34 2015
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Date: Thu, 11 Jun 2015 11:19:27 +0200
From: Loa Andersson <loa@pi.nu>
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Subject: [mpls] Closed - MPLS working group last call on draft-ietf-mpls-lsp-ping-relay-reply
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Working group,

This wglc is closed. There are comments. Can the authors please address
the comments, close loops with the people making comments and make sure
that they are comfortable with how the comments are addressed.

After that post a new version of the document.

/Loa
mpls wg co-chair

On 2015-05-27 11:20, Loa Andersson wrote:
> Working Group,
>
> This is to initiate a two week working group last call on
> draft-ietf-mpls-lsp-ping-relay-reply.
>
> Please send your comments to the mpls wg mailing list (mpls@ietf.org).
>
> There are two IPR disclosures against this document. All the authors
> and contributors have stated on the working group mailing list that
> they are not aware of any other IPRs that relates to this draft.
>
> This working group last call ends June 10, 2015.
>
> A little bit of background. We requested publication for this draft
> earlier, but very late in the process it was discovered that the
> document needed more work - and it was returned to the working group.
> Document has been updated, and you can find a diff:
>
> https://www.ietf.org/rfcdiff?url1=draft-ietf-mpls-lsp-ping-relay-reply-05&url2=draft-ietf-mpls-lsp-ping-relay-reply-09
>
>
> A discussion on the updates can be found at:
> http://www.ietf.org/proceedings/92/slides/slides-92-mpls-8.pdf
>
> /Loa
> for the MPLS wg 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 Thu Jun 11 18:10:20 2015
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Subject: [mpls] I-D Action: draft-ietf-mpls-entropy-lsp-ping-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           : 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-ietf-mpls-entropy-lsp-ping-01.txt
	Pages           : 21
	Date            : 2015-06-11

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-ietf-mpls-entropy-lsp-ping/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-mpls-entropy-lsp-ping-01

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-entropy-lsp-ping-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 Fri Jun 12 10:09:21 2015
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From nobody Mon Jun 15 11:25:25 2015
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Subject: [mpls] I-D Action: draft-ietf-mpls-self-ping-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           : LSP Self-Ping
        Authors         : Ravi Torvi
                          Ron Bonica
                          Ina Minei
                          Michael Conn
                          Dante Pacella
                          Luis Tomotaki
                          Mark Wygant
	Filename        : draft-ietf-mpls-self-ping-02.txt
	Pages           : 11
	Date            : 2015-06-15

Abstract:
   When certain RSVP-TE optimizations are implemented, ingress LSRs can
   receive RSVP RESV messages before forwarding state has been installed
   on all downstream nodes.  According to the RSVP-TE specification, the
   ingress LSR can forward traffic through an LSP as soon as it receives
   a RESV message.  However, if the ingress LSR forwards traffic through
   the LSP before forwarding state has been installed on all downstream
   nodes, traffic can be lost.

   This memo describes LSP Self-ping.  When an ingress LSR receives an
   RESV message, it can invoke LSP Self-ping procedures to ensure that
   forwarding state has been installed on all downstream nodes.

   LSP Self-ping is an extremely light-weight mechanism.  It does not
   consume control plane resources on transit or egress LSRs.



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

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-mpls-self-ping-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-self-ping-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.

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From nobody Tue Jun 16 13:05:45 2015
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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: <mpls@ietf.org>
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Date: Tue, 16 Jun 2015 21:05:38 +0100
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Subject: [mpls] FW: New Version Notification for draft-vainshtein-mpls-gal-tc-ttl-handling-01.txt
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Hi WG,

We updated this I-D to address the early review comments received =
on-list (for which, thanks).

It's only a small draft and we think it is ready, although we'd be very =
happy to receive further comments.

So the question to the chairs is about how to proceed.

Could you simply do a WG last call, or will you adopt it first?
If you want to adopt it, will you run through the process of MPLS-RT =
review followed by adoption poll, or will you just get on with it?
Or should we just move along with the AD?

Let us know what you'd like to do.

Thanks,
Adrian

> A new version of I-D, draft-vainshtein-mpls-gal-tc-ttl-handling-01.txt
> has been successfully submitted by Adrian Farrel and posted to the
> IETF repository.
>=20
> Name:		draft-vainshtein-mpls-gal-tc-ttl-handling
> Revision:	01
> Title:		Handling the TC and TTL fields in a Label Stack Entry when the
> Generic Associated Channel Label is Present
> Document date:	2015-06-16
> Group:		Individual Submission
> Pages:		6
> Status:
>  =
https://datatracker.ietf.org/doc/draft-vainshtein-mpls-gal-tc-ttl-handlin=
g/
>=20
> Abstract:
>    This document clarifies handling of the Traffic Class (TC) and =
Time-
>    to-Live (TTL) fields of a Label Stack Entry that contains the =
Generic
>    Associated Channel (G-ACh) Label (GAL).  These clarifications are
>    intended to aid interoperability of implementations.
>=20
>    Original handling was defined in RFC 5586, and this document =
updates
>    that RFC.


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Subject: [mpls] I-D Action: draft-cheng-mpls-tp-shared-ring-protection-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           : MPLS-TP Shared-Ring protection (MSRP) mechanism for ring topology
        Authors         : Weiqiang Cheng
                          Lei Wang
                          Han Li
                          Huub van Helvoort
                          Kai Liu
                          Jie Dong
                          Jia He
                          Fang Li
                          Jian Yang
                          Junfang Wang
	Filename        : draft-cheng-mpls-tp-shared-ring-protection-05.txt
	Pages           : 44
	Date            : 2015-06-17

Abstract:
   This document describes requirements, architecture and solutions for
   MPLS-TP Shared Ring Protection (MSRP) in the ring topology for point-
   to-point (P2P) services.  The mechanism of MSRP is illustrated and
   how it satisfies the requirements in RFC 5654 for optimized ring
   protection is analyzed.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-cheng-mpls-tp-shared-ring-protection/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-cheng-mpls-tp-shared-ring-protection-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-cheng-mpls-tp-shared-ring-protection-05


Please note that it may take a couple of minutes from the time of submission
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From: Weiqiang Cheng <chengwq@gmail.com>
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Subject: [mpls] Would the WG like to adopt draft-kompella-mpls-rmr-01 and draft-cheng-mpls-tp-shared-ring-protection-05?
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Date: Wed, 17 Jun 2015 22:31:55 +0800
From: "lizho.jin@gmail.com" <lizho.jin@gmail.com>
To: adrian <adrian@olddog.co.uk>, loa <loa@pi.nu>, mpls <mpls@ietf.org>,  mpls-chairs <mpls-chairs@tools.ietf.org>,  draft-ietf-mpls-lsp-ping-relay-reply <draft-ietf-mpls-lsp-ping-relay-reply@tools.ietf.org>,  db3546 <db3546@att.com>
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	charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charse=
t=3Dus-ascii"><style>body { line-height: 1.5; }blockquote { margin-top: 0p=
x; margin-bottom: 0px; margin-left: 0.5em; }div.foxdiv20150617222407645879=
 { }body { font-size: 10.5pt; font-family: 'Times New Roman'; color: rgb(0=
, 0, 0); line-height: 1.5; }</style></head><body>=0A<div><span></span>Hi G=
eorge,</div><div>For Adrian's below comments related with&nbsp;<span style=
=3D"font-family: ''; font-size: 10.5pt; line-height: 1.5; background-color=
: window;">MTU Exceeded Return Code, in the draft, it says: "</span><span =
style=3D"font-family: ''; font-size: 10.5pt; line-height: 1.5; background-=
color: window;">The&nbsp;</span><span style=3D"font-family: ''; font-size:=
 10.5pt; line-height: 1.5; background-color: window;">return sub-code MUST=
 be set to the value that otherwise would have&nbsp;</span><span style=3D"=
font-family: ''; font-size: 10.5pt; line-height: 1.5; background-color: wi=
ndow;">been sent". I tend to set the&nbsp;</span><span style=3D"font-famil=
y: ''; font-size: 10.5pt; line-height: 1.5; background-color: window;">ret=
urn sub-code to zero also. Since we have changed the return code, then it =
is meanless to retain the original sub-code. Any comments?</span></div><di=
v><br></div><hr style=3D"WIDTH: 210px; HEIGHT: 1px" color=3D"#b5c4df" size=
=3D"1" align=3D"left">=0A<div><span><div style=3D"MARGIN: 10px; FONT-FAMIL=
Y: verdana; FONT-SIZE: 10pt"><div>Regards</div><div>Lizhong</div></div></s=
pan></div>=0A<blockquote style=3D"margin-top: 0px; margin-bottom: 0px; mar=
gin-left: 0.5em;"><div>&nbsp;</div><div style=3D"border:none;border-top:so=
lid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm"><div style=3D"PADDING-RIGHT: =
8px; PADDING-LEFT: 8px; FONT-SIZE: 12px;FONT-FAMILY:tahoma;COLOR:#000000; =
BACKGROUND: #efefef; PADDING-BOTTOM: 8px; PADDING-TOP: 8px"><div><b>From:<=
/b>&nbsp;<a href=3D"mailto:lizho.jin@gmail.com">lizho.jin@gmail.com</a></d=
iv><div><b>Date:</b>&nbsp;2015-06-10&nbsp;00:09</div><div><b>To:</b>&nbsp;=
<a href=3D"mailto:adrian@olddog.co.uk">adrian</a>; <a href=3D"mailto:loa@p=
i.nu">loa</a>; <a href=3D"mailto:mpls@ietf.org">mpls</a>; <a href=3D"mailt=
o:mpls-chairs@tools.ietf.org">mpls-chairs</a>; <a href=3D"mailto:draft-iet=
f-mpls-lsp-ping-relay-reply@tools.ietf.org">draft-ietf-mpls-lsp-ping-relay=
-reply</a>; <a href=3D"mailto:db3546@att.com">db3546</a></div><div><b>Subj=
ect:</b>&nbsp;RE: [mpls] MPLS working group last call on draft-ietf-mpls-l=
sp-ping-relay-reply</div></div></div><div><div class=3D"FoxDiv201506172224=
07645879">=0A<div><span></span>Hi Adrian,</div><div>Thank you for the revi=
ew. Please see my reply inline below. Correct me if other authors have dif=
ferent opinion.</div><div>I will update the draft after the end of last ca=
ll.</div>=0A<div><br></div><hr style=3D"width: 210px; height: 1px;" color=
=3D"#b5c4df" size=3D"1" align=3D"left">=0A<div><span><div style=3D"MARGIN:=
 10px; FONT-FAMILY: verdana; FONT-SIZE: 10pt"><div>Regards</div><div>Lizho=
ng</div></div></span></div>=0A<blockquote style=3D"margin-top: 0px; margin=
-bottom: 0px; margin-left: 0.5em;"><div>&nbsp;</div><div style=3D"border:n=
one;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm"><div style=
=3D"PADDING-RIGHT: 8px; PADDING-LEFT: 8px; FONT-SIZE: 12px;FONT-FAMILY:tah=
oma;COLOR:#000000; BACKGROUND: #efefef; PADDING-BOTTOM: 8px; PADDING-TOP: =
8px"><div><b>From:</b>&nbsp;<a href=3D"mailto:adrian@olddog.co.uk">Adrian =
Farrel</a></div><div><b>Date:</b>&nbsp;2015-06-06&nbsp;00:34</div><div><b>=
To:</b>&nbsp;<a href=3D"mailto:loa@pi.nu">'Loa Andersson'</a>; <a href=3D"=
mailto:mpls@ietf.org">mpls@ietf.org</a>; <a href=3D"mailto:mpls-chairs@too=
ls.ietf.org">mpls-chairs@tools.ietf.org</a>; <a href=3D"mailto:draft-ietf-=
mpls-lsp-ping-relay-reply@tools.ietf.org">draft-ietf-mpls-lsp-ping-relay-r=
eply@tools.ietf.org</a>; <a href=3D"mailto:db3546@att.com">'BRUNGARD, DEBO=
RAH A'</a></div><div><b>Subject:</b>&nbsp;RE: [mpls] MPLS working group la=
st call on	draft-ietf-mpls-lsp-ping-relay-reply</div></div></div><div><div=
>Hi,</div>=0A<div>&nbsp;</div>=0A<div>Just being a good citizen and review=
ing this I-D during WG last call.</div>=0A<div>I didn't have much time so =
I only found a number of nits most of which</div>=0A<div>are probably not =
significant.</div>=0A<div>&nbsp;</div>=0A<div>Cheers,</div>=0A<div>Adrian<=
/div>=0A<div>&nbsp;</div>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>idni=
ts notes the presence of a pre-RFC5378 disclaimer. Do you really </div>=0A=
<div>need that?</div><div>[Lizhong] this may need the answer from chairs a=
nd AD. We only follow the rules.</div>=0A<div>&nbsp;</div>=0A<div>---</div=
>=0A<div>&nbsp;</div>=0A<div>Abstract</div>=0A<div>&nbsp;</div>=0A<div>&nb=
sp;</div>=0A<div>You expand "LSR" correctly, but not on first use.</div><d=
iv>[Lizhong] Good catch, thanks.</div>=0A<div>&nbsp;</div>=0A<div>---</div=
>=0A<div>&nbsp;</div>=0A<div>Abstract</div>=0A<div>&nbsp;</div>=0A<div>&nb=
sp;&nbsp; a replying LSR may not have the available route to the</div>=0A<=
div>&nbsp;&nbsp; initiator</div>=0A<div>&nbsp;</div>=0A<div>s/the/an/</div=
><div>[Lizhong] accept</div>=0A<div>&nbsp;</div>=0A<div>---</div>=0A<div>&=
nbsp;</div>=0A<div>Section 1</div>=0A<div>&nbsp;</div>=0A<div>You need to =
expand "LSR" on first use.</div><div>[Lizhong] accept</div>=0A<div>&nbsp;<=
/div>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>Section 1</div>=0A<div>&=
nbsp;</div>=0A<div>&nbsp;&nbsp; This document describes the extensions to =
the Label Switched Path</div>=0A<div>&nbsp;&nbsp; (LSP) Ping as specified =
in [RFC4379], by adding a relayed echo reply</div>=0A<div>&nbsp;&nbsp; mec=
hanism which could be used to detect data plane failures for the</div>=0A<=
div>&nbsp;&nbsp; inter autonomous system (AS) and inter-area LSPs. </div>=
=0A<div>&nbsp;</div>=0A<div>s/the extensions/extensions/</div>=0A<div>s/de=
tect/report/ ???</div>=0A<div>s/for the/for/</div><div>[Lizhong] accept</d=
iv>=0A<div>&nbsp;</div>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>Sectio=
n 1</div>=0A<div>&nbsp;</div>=0A<div>Delete "The extensions are to update =
the [RFC4379]." as it duplicates</div>=0A<div>the previous sentence.</div>=
<div>[Lizhong] accept</div>=0A<div>&nbsp;</div>=0A<div>---</div>=0A<div>&n=
bsp;</div>=0A<div>Section 1</div>=0A<div>&nbsp;</div>=0A<div>&nbsp;&nbsp; =
may not have the available route</div>=0A<div>&nbsp;</div>=0A<div>s/the/an=
/</div><div>[Lizhong] accept</div>=0A<div>&nbsp;</div>=0A<div>---</div>=0A=
<div>&nbsp;</div>=0A<div>Section 2</div>=0A<div>&nbsp;</div>=0A<div>&nbsp;=
&nbsp; LSP Ping [RFC4379] defines a mechanism to detect the data plane</di=
v>=0A<div>&nbsp;&nbsp; failures and localize faults. </div>=0A<div>&nbsp;<=
/div>=0A<div>s/the data/data/</div><div>[Lizhong] accept</div>=0A<div>&nbs=
p;</div>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>Section 2</div>=0A<di=
v>&nbsp;</div>=0A<div>OLD</div>=0A<div>&nbsp;&nbsp; using an UDP packet wi=
th</div>=0A<div>&nbsp;&nbsp; the IPv4/IPv6 address of the originating LSR<=
/div>=0A<div>NEW</div>=0A<div>&nbsp;&nbsp; using a UDP packet with</div>=
=0A<div>&nbsp;&nbsp; the IPv4/IPv6 destination address set to an address o=
f the</div>=0A<div>&nbsp;&nbsp; LSR that originated the Echo Request.</div=
>=0A<div>&nbsp;<span style=3D"font-size: 10.5pt; line-height: 1.5; backgro=
und-color: window;">[Lizhong] accept</span></div><div><span style=3D"font-=
size: 10.5pt; line-height: 1.5; background-color: window;"><br></span></di=
v>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>Section 2</div>=0A<div>&nbs=
p;</div>=0A<div>OLD</div>=0A<div>&nbsp;&nbsp; IP addresses reachability ar=
e allowed</div>=0A<div>NEW</div>=0A<div>&nbsp;&nbsp; IP address reachabili=
ty is allowed</div>=0A<div>&nbsp;<span style=3D"font-size: 10.5pt; line-he=
ight: 1.5; background-color: window;">[Lizhong] accept</span></div>=0A<div=
>---</div>=0A<div>&nbsp;</div>=0A<div>Section 2</div>=0A<div>&nbsp;</div>=
=0A<div>OLD</div>=0A<div>&nbsp;&nbsp; In fact, it</div>=0A<div>&nbsp;&nbsp=
; is almost uniformly the case that in inter-AS scenarios, it is not</div>=
=0A<div>&nbsp;&nbsp; allowed the distribution or direct routing to the IP =
addresses of any</div>=0A<div>&nbsp;&nbsp; of the nodes other than the ASB=
R in another AS.</div>=0A<div>NEW</div>=0A<div>&nbsp;&nbsp; In fact, it</d=
iv>=0A<div>&nbsp;&nbsp; is almost always the case that in inter-AS scenari=
os the only node in</div>=0A<div>&nbsp;&nbsp; one AS to which direct routi=
ng is allowed from the other AS is the </div>=0A<div>&nbsp;&nbsp; ASBR, an=
d routing information from within one AS is not distributed </div>=0A<div>=
&nbsp;&nbsp; into another AS.</div>=0A<div>&nbsp;<span style=3D"font-size:=
 10.5pt; line-height: 1.5; background-color: window;">[Lizhong] accept</sp=
an></div>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>Section 2</div>=0A<d=
iv>&nbsp;</div>=0A<div>&nbsp;&nbsp; Figure 1 demonstrates a case where one=
 LSP is set up between PE1 and</div>=0A<div>&nbsp;</div>=0A<div>s/one/an/<=
/div>=0A<div>[Lizhong] accept</div>=0A<div>---</div>=0A<div>&nbsp;</div>=
=0A<div>Section 2</div>=0A<div>&nbsp;</div>=0A<div>You should expand "AN" =
on first use.</div>=0A<div>&nbsp;<span style=3D"font-size: 10.5pt; line-he=
ight: 1.5; background-color: window;">[Lizhong] accept</span></div>=0A<div=
>---</div>=0A<div>&nbsp;</div>=0A<div>Section 3</div>=0A<div>&nbsp;</div>=
=0A<div>&nbsp;&nbsp; A new TLV named Relay Node Address Stack TLV is defin=
ed in this</div>=0A<div>&nbsp;&nbsp; document, to carry the IP addresses o=
f the possible relay nodes for</div>=0A<div>&nbsp;&nbsp; the replying LSR.=
</div>=0A<div>&nbsp;</div>=0A<div>In what way are they "possible" relay no=
des? The description of the</div>=0A<div>mechanism seems to say that these=
 addresses must be used an in the</div>=0A<div>supplied order.</div><div>[=
Lizhong] the word&nbsp;<span style=3D"font-size: 10.5pt; line-height: 1.5;=
 background-color: window;">"possible" is not correctly used here. I will =
remove it.</span></div>=0A<div>&nbsp;</div>=0A<div>---</div>=0A<div>&nbsp;=
</div>=0A<div>Section 3.1 and onwards</div>=0A<div>&nbsp;</div>=0A<div>It =
would help IANA if you distinguished your two instances of "TBD" by</div>=
=0A<div>using "TBD1", "TBD2", and "TBD3".</div>=0A<div>&nbsp;<span style=
=3D"font-size: 10.5pt; line-height: 1.5; background-color: window;">[Lizho=
ng] accept</span></div>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>Sectio=
n 3.2</div>=0A<div>&nbsp;</div>=0A<div>It looks to me that you intend that=
 the address list can include </div>=0A<div>addresses of mixed types (othe=
rwise you would not need the address</div>=0A<div>type in each entry). How=
ever, your offset is provided as a counter</div>=0A<div>and that means tha=
t each time this list is processed, the list must</div>=0A<div>be walked f=
rom top down since each entry may be of a different length.</div>=0A<div>T=
hus, while the stack is optimized for stripping unwanted addresses </div>=
=0A<div>from the end of the TLV, it is as suboptimal as you could have mad=
e it</div>=0A<div>for parsing because every node that processes the TLV mu=
st scan every</div>=0A<div>entry in the list.</div>=0A<div>&nbsp;</div>=0A=
<div>Why not replace the count of addresses with a count of octets to enab=
le</div>=0A<div>quicker access into the list?</div><div>[Lizhong] either i=
s OK. George has same preferrence for octets. I will</div><div>change to o=
ctets number across the document.</div>=0A<div>&nbsp;</div>=0A<div>---</di=
v>=0A<div>&nbsp;</div>=0A<div>Section 3.2</div>=0A<div>&nbsp;</div>=0A<div=
>&nbsp;&nbsp; K bit: if the K bit is set to 1, then this sub-TLV MUST be k=
ept in</div>=0A<div>&nbsp;&nbsp; Relay Node Address Stack during TLV compr=
ess process described in</div>=0A<div>&nbsp;&nbsp; section 4.2.</div>=0A<d=
iv>&nbsp;</div>=0A<div>The address stack entry is not a sub-TLV.</div>=0A<=
div>&nbsp;</div>=0A<div>I am inferring from this text that set to 0 the K =
bit indicates that the</div>=0A<div>address stack entry can be kept in or =
left out at will, but actually 4.2</div>=0A<div>gives some considerably mo=
re complex rules for stripping or not </div>=0A<div>stripping when k=3D0. =
Perhaps you need...</div>=0A<div>&nbsp;</div>=0A<div>&nbsp;&nbsp; K bit: i=
f the K bit is set to 1, then this address stack entry MUST</div>=0A<div>&=
nbsp;&nbsp; NOT be stripped from the Relay Node Address Stack during proce=
ssing</div>=0A<div>&nbsp;&nbsp; described in Section 4.2. If the K bit is =
clear, the entry might be</div>=0A<div>&nbsp;&nbsp; stripped according to =
the processing described in Section 4.2.</div><div>[Lizhong] accepted, muc=
h clear now.</div>=0A<div>&nbsp;</div>=0A<div>---</div>=0A<div>&nbsp;</div=
>=0A<div>Section 3.3 seems very "sudden". It doesn't seem to be related to=
 this</div>=0A<div>document in particular. It is true that the presence of=
 a Relay Node </div>=0A<div>Address Stack TLV increases the size of the Ec=
ho Reply (or Relayed</div>=0A<div>Echo Reply) message, but presumably the =
problem with exceeding the</div>=0A<div>MTU is only exacerbated by, not ca=
used by, this TLV.</div>=0A<div>&nbsp;</div>=0A<div>Furthermore, section 3=
.3 talks about dropping TLVs (or sending them </div>=0A<div>with length ze=
ro), but gives no hints about which should or can be </div>=0A<div>dropped=
 to get the MTU down to size. For example, dropping the Relay</div>=0A<div=
>Node Address Stack TLV would presumably be frowned upon.</div><div>[Lizho=
ng] section 4.2 talks about this as below. How about to add a&nbsp;</div><=
div>reference in section 3.3?</div><div><span style=3D"font-family: &quot;=
" times=3D"" new=3D"" roman'";=3D"" font-size:=3D"" 14px;=3D"" color:=3D""=
 rgb(0,=3D"" 0,=3D"" 0);=3D"" background-color:=3D"" rgba(0,=3D"" font-wei=
ght:=3D"" normal;=3D"" font-style:=3D"" normal;text-decoration:=3D"" none;=
'=3D"">&nbsp; &nbsp;If the full reply message would exceed the MTU size, t=
he Relay Node<br>   Address Stack TLV SHOULD be included in the Echo Reply=
 message (i.e.,<br>   other optional TLVs are excluded).</span></div>=0A<d=
iv>&nbsp;</div>=0A<div>Lastly, I cannot understand how the new return code=
 is handled when</div>=0A<div>some other return code is also demanded.</di=
v><div>[Lizhong] I will add the following:</div><div>In&nbsp;<span style=
=3D"font-size: 10.5pt; line-height: 1.5; background-color: window;">sectio=
n 4.4 of [RFC4379], step 7 will be updated.&nbsp;</span></div><div><span s=
tyle=3D"font-family: &quot;" times=3D"" new=3D"" roman'";=3D"" font-size:=
=3D"" 14px;=3D"" color:=3D"" rgb(0,=3D"" 0,=3D"" 0);=3D"" background-color=
:=3D"" rgba(0,=3D"" font-weight:=3D"" normal;=3D"" font-style:=3D"" normal=
;text-decoration:=3D"" none;'=3D"">Before sending Echo Reply, the new pack=
et size should be checked.</span></div><div><span style=3D"font-family: &q=
uot;" times=3D"" new=3D"" roman'";=3D"" font-size:=3D"" 14px;=3D"" color:=
=3D"" rgb(0,=3D"" 0,=3D"" 0);=3D"" background-color:=3D"" rgba(0,=3D"" fon=
t-weight:=3D"" normal;=3D"" font-style:=3D"" normal;text-decoration:=3D"" =
none;'=3D"">If  Best-return-code is 3 ("Replying router is an egress for=
=0Athe FEC at stack depth"),&nbsp;</span></div><div><span style=3D"font-fa=
mily: &quot;" times=3D"" new=3D"" roman'";=3D"" font-size:=3D"" 14px;=3D""=
 color:=3D"" rgb(0,=3D"" 0,=3D"" 0);=3D"" background-color:=3D"" rgba(0,=
=3D"" font-weight:=3D"" normal;=3D"" font-style:=3D"" normal;text-decorati=
on:=3D"" none;'=3D"">or 8 ("Label switched at stack-depth"), and if the pa=
cket size exceeds MTU size, then<br></span></div><div><span style=3D"font-=
family: &quot;" times=3D"" new=3D"" roman'";=3D"" font-size:=3D"" 14px;=3D=
"" color:=3D"" rgb(0,=3D"" 0,=3D"" 0);=3D"" background-color:=3D"" rgba(0,=
=3D"" font-weight:=3D"" normal;=3D"" font-style:=3D"" normal;text-decorati=
on:=3D"" none;'=3D"">Best-return-code is TBD3 ("<span style=3D"font-family=
: &quot;" times=3D"" new=3D"" roman'";=3D"" font-size:=3D"" 14px;=3D"" col=
or:=3D"" rgb(0,=3D"" 0,=3D"" 0);=3D"" background-color:=3D"" rgba(0,=3D"" =
font-weight:=3D"" normal;=3D"" font-style:=3D"" normal;text-decoration:=3D=
"" none;'=3D"">One or more TLVs not returned due to MTU size</span>")</spa=
n></div><div><span style=3D"font-family: &quot;" times=3D"" new=3D"" roman=
'";=3D"" font-size:=3D"" 14px;=3D"" color:=3D"" rgb(0,=3D"" 0,=3D"" 0);=3D=
"" background-color:=3D"" rgba(0,=3D"" font-weight:=3D"" normal;=3D"" font=
-style:=3D"" normal;text-decoration:=3D"" none;'=3D""><br></span></div><di=
v><span style=3D"font-family: &quot;" times=3D"" new=3D"" roman'";=3D"" fo=
nt-size:=3D"" 14px;=3D"" color:=3D"" rgb(0,=3D"" 0,=3D"" 0);=3D"" backgrou=
nd-color:=3D"" rgba(0,=3D"" font-weight:=3D"" normal;=3D"" font-style:=3D"=
" normal;text-decoration:=3D"" none;'=3D""><br></span></div>=0A<div>Maybe =
there is text missing from section 4. All I could find was the</div>=0A<di=
v>last paragraph of 4.2.</div>=0A<div>&nbsp;</div>=0A<div>---</div>=0A<div=
>&nbsp;</div>=0A<div>Section 4.1</div>=0A<div>&nbsp;</div>=0A<div>&nbsp;&n=
bsp; In addition to the procedures described in section 4.3 of [RFC4379],<=
/div>=0A<div>&nbsp;&nbsp; a Relay Node Address Stack TLV MUST be carried i=
n the Echo Request</div>=0A<div>&nbsp;&nbsp; message to facilitate the rel=
ay functionality.</div>=0A<div>&nbsp;</div>=0A<div>This is ambiguous. The =
update to 4379 is not that the new TLV must be </div>=0A<div>included in t=
he echo request in order to facilitate the relay </div>=0A<div>functionali=
ty. I think you mean that you have defined an optional TLV</div>=0A<div>th=
at can be included in an echo request message to facilitate the relay</div=
>=0A<div>functionality, and that where that functionality is needed in ord=
er to</div>=0A<div>relay echo reply messages, the new TLV must be included=
 in the echo</div>=0A<div>request message.</div><div>[Lizhong] correct. Re=
phrased as below:</div><div><span style=3D"font-family: &quot;" times=3D""=
 new=3D"" roman'";=3D"" font-size:=3D"" 14px;=3D"" color:=3D"" rgb(0,=3D""=
 0,=3D"" 0);=3D"" background-color:=3D"" rgba(0,=3D"" font-weight:=3D"" no=
rmal;=3D"" font-style:=3D"" normal;text-decoration:=3D"" none;'=3D"">In ad=
dition to the procedures described in section 4.3 of [RFC4379],<br>   a Re=
lay Node Address Stack TLV MUST be carried in the Echo Request<br>   messa=
ge if the relay functionality is required.</span></div>=0A<div>&nbsp;</div=
>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>Section 4.1</div>=0A<div>&nb=
sp;</div>=0A<div>&nbsp;&nbsp; The source UDP port field MUST be set</div>=
=0A<div>&nbsp;&nbsp; to the source UDP port.</div>=0A<div>&nbsp;</div>=0A<=
div>There is no "source UDP port" field. Perhaps the "Initiator Source Por=
t"</div>=0A<div>field?</div>=0A<div>&nbsp;</div>=0A<div>But also, this tex=
t is quite confusing. The text in 3.2 is much clearer.</div><div>[Lizhong]=
 yes, should be:&nbsp;</div><div><span style=3D"font-size: 10.5pt; line-he=
ight: 1.5; background-color: window;">The source UDP port field MUST be se=
t</span><span style=3D"font-size: 10.5pt; line-height: 1.5; background-col=
or: window;">&nbsp;to the i</span><span style=3D"font-size: 10.5pt; line-h=
eight: 1.5; background-color: window;">nitiator&nbsp;</span><span style=3D=
"background-color: window; font-size: 10.5pt; line-height: 1.5;">source po=
rt.</span></div>=0A<div>&nbsp;</div>=0A<div>---</div>=0A<div>&nbsp;</div>=
=0A<div>Section 4.1 appears to lack guidance about how to construct a Rela=
y Node</div>=0A<div>Address Stack TLV to include in an Echo Request messag=
e. One may cross-</div>=0A<div>reference to 4.6 and then a lot becomes cle=
ar (including the processes </div>=0A<div>in 4.2 that otherwise appear con=
voluted!).</div><div>[Lizhong] accept, will add reference to 4.6.</div>=0A=
<div>&nbsp;</div>=0A<div>I believe that what you have in mind is that befo=
re you can do end-to-</div>=0A<div>end LSP ping, you must perform a tracer=
oute in order to collect and</div>=0A<div>construct the full Relay Node Ad=
dress Stack TLV. Shouldn't the document</div>=0A<div>make this clear?</div=
><div>[Lizhong] traceroute is not mandatory before ping. If operator has k=
nowledge&nbsp;</div><div>of the relay nodes, the initiator could directly =
send ping with&nbsp;<span style=3D"font-size: 10.5pt; line-height: 1.5; ba=
ckground-color: window;">Relay Node&nbsp;</span></div><div><span style=3D"=
font-size: 10.5pt; line-height: 1.5; background-color: window;">Address St=
ack TLV containing the already known relay nodes.</span></div>=0A<div>&nbs=
p;</div>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>Section 4.2</div>=0A<=
div>&nbsp;</div>=0A<div>&nbsp;&nbsp; An LSR that does not recognize the Re=
lay Node Address Stack TLV,</div>=0A<div>&nbsp;&nbsp; SHOULD ignore it as =
per section 3 of [RFC4379].</div>=0A<div>&nbsp;</div>=0A<div>You are not s=
eeking to change 4379 behavior here, so using 2119 SHOULD</div>=0A<div>is =
confusing. Indeed, you cannot change legacy behavior in this </div>=0A<div=
>document. </div>=0A<div>&nbsp;</div>=0A<div>I think you need...</div>=0A<=
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;&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; </div>=0A<div>&nbsp;&nbsp; The Type of the Relay Node Address=
 Stack TLV is chosen from the range</div>=0A<div>&nbsp;&nbsp; 32768 to 491=
61 so that (per section 3 of [RFC4379]) an LSR that does</div>=0A<div>&nbs=
p;&nbsp; not recognize the TLV knows that the TLV is optional and can safe=
ly</div>=0A<div>&nbsp;&nbsp; ignore it.</div><div>[Lizhong] accept</div>=
=0A<div>&nbsp;</div>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>I tried t=
o work out how things would pan out if two ASes on the path </div>=0A<div>=
used the same address space within their AS. Would an address appear in</d=
iv>=0A<div>the stack and seem to be routable when it is really an address =
in the</div>=0A<div>other AS?</div><div>[Lizhong] we have an example in se=
ction 5. And address of P1 and P2 could be&nbsp;</div><div>same. In that&n=
bsp;<span style=3D"font-size: 10.5pt; line-height: 1.5; background-color: =
window;">case, ASBR1 must&nbsp;</span><span style=3D"font-family: ''; font=
-size: 10.5pt; line-height: 1.5; background-color: window;">adds its&nbsp;=
</span><span style=3D"font-family: ''; font-size: 10.5pt; line-height: 1.5=
; background-color: window;">interface address facing ASBR2 with&nbsp;</sp=
an></div><div><span style=3D"font-family: ''; font-size: 10.5pt; line-heig=
ht: 1.5; background-color: window;">the K bit set. Then relay reply will n=
ot be miss-routed.</span></div><div>&nbsp;</div>=0A<div>---</div>=0A<div>&=
nbsp;</div>=0A<div>4.3 has</div>=0A<div>&nbsp;</div>=0A<div>&nbsp;&nbsp; I=
f the first IP address in the Relay Node Address Stack TLV is not</div>=0A=
<div>&nbsp;&nbsp; the next relay node address</div>=0A<div>&nbsp;</div>=0A=
<div>There are two questions that follow:</div>=0A<div>- You have a "SHOUL=
D" to resolve this "if". What are the conditions for</div>=0A<div>&nbsp; v=
arying that behavior?</div>=0A<div>- You don't say what to do if this "if"=
 is not satisfied. Presumably, in</div>=0A<div>&nbsp; this case it sends a=
n Echo Reply and you can address my question with</div>=0A<div>&nbsp; a po=
inter to 4.5.</div><div>[Lizhong] accept. Will add the following:</div><di=
v><span style=3D"font-family: &quot;" times=3D"" new=3D"" roman'";=3D"" fo=
nt-size:=3D"" 14px;=3D"" color:=3D"" rgb(0,=3D"" 0,=3D"" 0);=3D"" backgrou=
nd-color:=3D"" rgba(0,=3D"" font-weight:=3D"" normal;=3D"" font-style:=3D"=
" normal;text-decoration:=3D"" none;'=3D"">&nbsp; &nbsp;When the next rela=
y node address is the first one in the address=0A<br>   list, please refer=
 to section 4.5.&nbsp;<br></span></div>=0A<div>&nbsp;</div>=0A<div>Similar=
ly, 4.4 has:</div>=0A<div>&nbsp;</div>=0A<div>&nbsp;&nbsp; If the next rel=
ay node address is not the first one in the address</div>=0A<div>&nbsp;&nb=
sp; list, i.e., another intermediate relay node, the relay node MUST send<=
/div>=0A<div>&nbsp;&nbsp; an Relayed Echo Reply message to the determined =
upstream node with</div>=0A<div>&nbsp;&nbsp; the payload unchanged other t=
han the Relay Node Address Stack TLV.</div>=0A<div>&nbsp;</div>=0A<div>If =
this "if" does not hold, what does the implementation do? Again, a </div>=
=0A<div>pointer to 4.5 may be enough.</div><div>[Lizhong] accept, will add=
 the following:</div><div><span style=3D"font-family: &quot;" times=3D"" n=
ew=3D"" roman'";=3D"" font-size:=3D"" 14px;=3D"" color:=3D"" rgb(0,=3D"" 0=
,=3D"" 0);=3D"" background-color:=3D"" rgba(0,=3D"" font-weight:=3D"" norm=
al;=3D"" font-style:=3D"" normal;text-decoration:=3D"" none;'=3D"">&nbsp; =
&nbsp;When the next relay node address is the first one in the address=0A<=
br>   list, please refer to section 4.5.&nbsp;<br></span></div>=0A<div>&nb=
sp;</div>=0A<div>---</div>=0A<div>&nbsp;</div>=0A<div>The third case in 4.=
5 is when the receiver does not understand the TLV</div>=0A<div>and ignore=
s it. In this case it will send an Echo Reply without itself</div>=0A<div>=
including the TLV.</div><div>[Lizhong] the receiver is unable to send the =
Echo Reply, because it does</div><div>know the destination IP address and =
UDP port number. So if the receiver</div><div>could not understand the TLV=
, then the relay message will be dropped.</div>=0A<div>&nbsp;</div>=0A<div=
>---</div>=0A<div>&nbsp;</div>=0A<div>Section 6 should note that the new T=
LV provides a way for Echo Reply</div>=0A<div>messages to be diverted so t=
hat information can be collected. For</div>=0A<div>example, if a stack ent=
ry can be inserted, the Echo Reply messages can</div>=0A<div>be caused to =
transit another AS unrelated to the LSP under test. Since</div>=0A<div>the=
 Echo Reply reveals path information about the LSP, this is a</div>=0A<div=
>valuable attack.&nbsp; Having said that, you can say how this TLV is </di=
v>=0A<div>protected in the Echo Reply message.</div><div>[Lizhong] Do you =
mean the new TLV could be used to collect path information</div><div>unrel=
ated to the LSP under test? This is not true. Only the node along the LSP&=
nbsp;</div><div>will add path information into the new TLV. The relay node=
 in the new TLV</div><div>will only relay the Echo Reply to the initiator,=
 and will not add information to</div><div>the new TLV.</div><div><br></di=
v><div><br></div>=0A<div>&gt; -----Original Message-----</div>=0A<div>&gt;=
 From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson</div=
>=0A<div>&gt; Sent: 27 May 2015 10:21</div>=0A<div>&gt; To: mpls@ietf.org;=
 mpls-chairs@tools.ietf.org; draft-ietf-mpls-lsp-ping-relay-</div>=0A<div>=
&gt; reply@tools.ietf.org; BRUNGARD, DEBORAH A</div>=0A<div>&gt; Subject: =
[mpls] MPLS working group last call on</div>=0A<div>draft-ietf-mpls-lsp-pi=
ng-relay-</div>=0A<div>&gt; reply</div>=0A<div>&gt; </div>=0A<div>&gt; Wor=
king Group,</div>=0A<div>&gt; </div>=0A<div>&gt; This is to initiate a two=
 week working group last call on</div>=0A<div>&gt; draft-ietf-mpls-lsp-pin=
g-relay-reply.</div>=0A<div>&gt; </div>=0A<div>&gt; Please send your comme=
nts to the mpls wg mailing list (mpls@ietf.org).</div>=0A<div>&gt; </div>=
=0A<div>&gt; There are two IPR disclosures against this document. All the =
authors</div>=0A<div>&gt; and contributors have stated on the working grou=
p mailing list that</div>=0A<div>&gt; they are not aware of any other IPRs=
 that relates to this draft.</div>=0A<div>&gt; </div>=0A<div>&gt; This wor=
king group last call ends June 10, 2015.</div>=0A<div>&gt; </div>=0A<div>&=
gt; A little bit of background. We requested publication for this draft</d=
iv>=0A<div>&gt; earlier, but very late in the process it was discovered th=
at the</div>=0A<div>&gt; document needed more work - and it was returned t=
o the working group.</div>=0A<div>&gt; Document has been updated, and you =
can find a diff:</div>=0A<div>&gt; </div>=0A<div>&gt; https://www.ietf.org=
/rfcdiff?url1=3Ddraft-ietf-mpls-lsp-ping-relay-reply-</div>=0A<div>&gt; 05=
&amp;url2=3Ddraft-ietf-mpls-lsp-ping-relay-reply-09</div>=0A<div>&gt; </di=
v>=0A<div>&gt; A discussion on the updates can be found at:</div>=0A<div>&=
gt; http://www.ietf.org/proceedings/92/slides/slides-92-mpls-8.pdf</div>=
=0A<div>&gt; </div>=0A<div>&gt; /Loa</div>=0A<div>&gt; for the MPLS wg cha=
irs</div>=0A<div>&gt; --</div>=0A<div>&gt; </div>=0A<div>&gt; </div>=0A<di=
v>&gt; Loa Andersson&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; email: loa@mail01.huawei.com</div>=0A<div>&gt; Senior MPLS Expe=
rt&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; loa@pi.nu</div>=0A<div>&gt; Huawei Technologies (consultant)&nbsp;&nb=
sp;&nbsp;&nbsp; phone: +46 739 81 21 64</div>=0A<div>&gt; </div>=0A<div>&g=
t; _______________________________________________</div>=0A<div>&gt; mpls =
mailing list</div>=0A<div>&gt; mpls@ietf.org</div>=0A<div>&gt; https://www=
.ietf.org/mailman/listinfo/mpls</div>=0A<div>&nbsp;</div>=0A</div></blockq=
uote>=0A</div></div></blockquote>=0A</body></html>
------=_001_NextPart471582760202_=------


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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: <mpls@ietf.org>
References: <20150617152318.17106.19358.idtracker@ietfa.amsl.com>
In-Reply-To: <20150617152318.17106.19358.idtracker@ietfa.amsl.com>
Date: Wed, 17 Jun 2015 16:43:59 +0100
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Subject: [mpls] FW: New Version Notification for draft-farrelll-mpls-opportunistic-encrypt-05.txt
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Many thanks to the MPLS-RT and to Charlie for valuable review comments.

Stephen and I have updated the draft to include resolution of these =
points and, I hope, this has improved the document.

I think, at this point, we can hand back to the WG chairs on the =
question of adoption.

Thanks,
Adrian

> -----Original Message-----
> From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
> Sent: 17 June 2015 16:23
> To: Adrian Farrel; Stephen Farrell; Adrian Farrel; Stephen Farrell
> Subject: New Version Notification for =
draft-farrelll-mpls-opportunistic-encrypt-
> 05.txt
>=20
>=20
> A new version of I-D, draft-farrelll-mpls-opportunistic-encrypt-05.txt
> has been successfully submitted by Adrian Farrel and posted to the
> IETF repository.
>=20
> Name:		draft-farrelll-mpls-opportunistic-encrypt
> Revision:	05
> Title:		Opportunistic Security in MPLS Networks
> Document date:	2015-06-16
> Group:		Individual Submission
> Pages:		34
> =
https://datatracker.ietf.org/doc/draft-farrelll-mpls-opportunistic-encryp=
t
>=20
> Abstract:
>    This document describes a way to apply opportunistic security
>    between adjacent nodes on an MPLS Label Switched Path (LSP) or
>    between end points of an LSP.  It explains how keys may be agreed
>    to enable encryption, and how key identifiers are exchanged in
>    encrypted MPLS packets.  Finally, this document describes the
>    applicability of this approach to opportunistic security in MPLS
>    networks with an indication of the level of improved security as
>    well as the continued vulnerabilities.
>=20
>    This document does not describe security for MPLS control plane
>    protocols.


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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: <lizho.jin@gmail.com>, "'loa'" <loa@pi.nu>, "'mpls'" <mpls@ietf.org>, "'mpls-chairs'" <mpls-chairs@tools.ietf.org>, "'draft-ietf-mpls-lsp-ping-relay-reply'" <draft-ietf-mpls-lsp-ping-relay-reply@tools.ietf.org>,  "'db3546'" <db3546@att.com>
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Subject: Re: [mpls] MPLS working group last call on draft-ietf-mpls-lsp-ping-relay-reply
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Lizhong,

Apologies, I fumbled your response.

I snipped out the stuff we agree on.

> Thank you for the review. Please see my reply inline below. Correct me
> if other authors have different opinion.
>
> I will update the draft after the end of last call.

>> Just being a good citizen and reviewing this I-D during WG last call.
>> I didn't have much time so I only found a number of nits most of =
which
>> are probably not significant.
>> ---
>>=20
>> idnits notes the presence of a pre-RFC5378 disclaimer. Do you really=20
>> need that?
>> [Lizhong] this may need the answer from chairs and AD. We only follow
>> the rules.

If you are following the rules, that's fine. I think the rules are that =
you only
need to include the disclaimer if text included in the document was =
written
before the date of RFC 5378 and if at least one of the authors of the =
text has
not given up their copyright as described in that RFC.

[snip]

>> Section 4.1
>>=A0
>>=A0=A0 The source UDP port field MUST be set
>>=A0=A0 to the source UDP port.
>>=A0
>> There is no "source UDP port" field. Perhaps the "Initiator Source =
Port"
>> field?
>>=A0
>> But also, this text is quite confusing. The text in 3.2 is much =
clearer.
> [Lizhong] yes, should be:=A0
> The source UDP port field MUST be set=A0to the initiator=A0source =
port.

Hmmm, I think...

"The Initiator Source Port field MUST be set to the source UDP port."
=A0
[snip]
=A0
> [Lizhong] traceroute is not mandatory before ping. If operator has =
knowledge=A0
> of the relay nodes, the initiator could directly send ping =
with=A0Relay Node=A0
> Address Stack TLV containing the already known relay nodes.

That would make a valuable addition to 4.1, as well.

[snip]

>> I tried to work out how things would pan out if two ASes on the path=20
>> used the same address space within their AS. Would an address appear =
in
>> the stack and seem to be routable when it is really an address in the
>> other AS?
> [Lizhong] we have an example in section 5. And address of P1 and P2 =
could be=A0
> same. In that=A0case, ASBR1 must=A0adds its=A0interface address facing =
ASBR2 with=A0
> the K bit set. Then relay reply will not be miss-routed.

Ah, I get it.
But this relies on ASBT1 setting the K bit.=20
So I suspect this needs to not be a special case: you need to require =
that the
domain boundary always sets the K bit.
=A0
[snip]
=A0
>> The third case in 4.5 is when the receiver does not understand the =
TLV
>> and ignores it. In this case it will send an Echo Reply without =
itself
>> including the TLV.
> [Lizhong] the receiver is unable to send the Echo Reply, because it =
does
> know the destination IP address and UDP port number. So if the =
receiver
> could not understand the TLV, then the relay message will be dropped.

Section 4.5 of 4379 says:

   The destination IP address and UDP port are copied from the
   source IP address and UDP port of the echo request.

That is what the legacy receiver will attempt to do. It doesn't matter =
whether
the optional Relay Node Address Stack TLV is in the echo request message =
or not,
the legacy node will follow 4379. So it *will* be able to respond.

>> Section 6 should note that the new TLV provides a way for Echo Reply
>> messages to be diverted so that information can be collected. For
>> example, if a stack entry can be inserted, the Echo Reply messages =
can
>> be caused to transit another AS unrelated to the LSP under test. =
Since
>> the Echo Reply reveals path information about the LSP, this is a
>> valuable attack.=A0 Having said that, you can say how this TLV is=20
>> protected in the Echo Reply message.
>
> [Lizhong] Do you mean the new TLV could be used to collect path =
information
> unrelated to the LSP under test? This is not true. Only the node along =
the
LSP=A0
> will add path information into the new TLV. The relay node in the new =
TLV
> will only relay the Echo Reply to the initiator, and will not add =
information
to
> the new TLV.

I think you misunderstand how security attacks might work. Suppose I am =
able to
do one of two things:
1. Modify the control plane code on a router that adds or processes a
    Relay Node Address Stack TLV so that it adds a bogus entry to the
     TLV. The prospect of modifications to control plane code is =
generally
     considered to be so disastrous that it is just noted without any=20
     further precautions (after all, if you can get at the control plane
     code, you can make the routers do anything).
2. Intercept and modify a packet in transit. This is the main risk I am=20
    talking about.

Cheers,
Adrian


From nobody Thu Jun 18 02:12:16 2015
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Subject: [mpls] Poll to see if we have consensus to adopt draft-farrelll-mpls-opportunistic-encrypt as an MPLS wg document
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Working Group,

This is to start a two week poll on adopting draft-farrelll-
mpls-opportunistic-encrypt-05 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 are no IPR disclosures directly against this document. An IPR
poll has been started in parallel to the adoption poll.

This poll ends July 2, 2015.

/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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Subject: [mpls] IPR poll on draft-farrelll-mpls-opportunistic-encrypt
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Working Group,

We have started a working group adoption poll on 
draft-farrelll-mpls-opportunistic-encrypt

We will do an IPR poll in parallel to the adoption poll.

This mail starts the IPR poll.

Are you aware of any IPR that applies to draft-farrelll-
mpls-opportunistic-encrypt?

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 no IPR disclosure that relate 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.


/Loa

(as 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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Date: Thu, 18 Jun 2015 17:46:27 +0800
From: "lizho.jin@gmail.com" <lizho.jin@gmail.com>
To: adrian <adrian@olddog.co.uk>, loa <loa@pi.nu>, mpls <mpls@ietf.org>,  mpls-chairs <mpls-chairs@tools.ietf.org>,  draft-ietf-mpls-lsp-ping-relay-reply <draft-ietf-mpls-lsp-ping-relay-reply@tools.ietf.org>,  db3546 <db3546@att.com>
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charse=
t=3Dutf-8"><style>body { line-height: 1.5; }blockquote { margin-top: 0px; =
margin-bottom: 0px; margin-left: 0.5em; }body { font-size: 10.5pt; font-fa=
mily: 'Times New Roman'; color: rgb(0, 0, 0); line-height: 1.5; }</style><=
/head><body>=0A<div><span></span>Hi Adrian,</div><div>Thanks for the reply=
. Please see inline below.</div>=0A<div><br></div><hr style=3D"width: 210p=
x; height: 1px;" color=3D"#b5c4df" size=3D"1" align=3D"left">=0A<div><span=
><div style=3D"MARGIN: 10px; FONT-FAMILY: verdana; FONT-SIZE: 10pt"><div>R=
egards</div><div>Lizhong</div></div></span></div>=0A<blockquote style=3D"m=
argin-top: 0px; margin-bottom: 0px; margin-left: 0.5em;"><div>&nbsp;</div>=
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm=
 0cm 0cm"><div style=3D"PADDING-RIGHT: 8px; PADDING-LEFT: 8px; FONT-SIZE: =
12px;FONT-FAMILY:tahoma;COLOR:#000000; BACKGROUND: #efefef; PADDING-BOTTOM=
: 8px; PADDING-TOP: 8px"><div><b>From:</b>&nbsp;<a href=3D"mailto:adrian@o=
lddog.co.uk">Adrian Farrel</a></div><div><b>Date:</b>&nbsp;2015-06-18&nbsp=
;02:28</div><div><b>To:</b>&nbsp;<a href=3D"mailto:lizho.jin@gmail.com">li=
zho.jin@gmail.com</a>; <a href=3D"mailto:loa@pi.nu">'loa'</a>; <a href=3D"=
mailto:mpls@ietf.org">'mpls'</a>; <a href=3D"mailto:mpls-chairs@tools.ietf=
.org">'mpls-chairs'</a>; <a href=3D"mailto:draft-ietf-mpls-lsp-ping-relay-=
reply@tools.ietf.org">'draft-ietf-mpls-lsp-ping-relay-reply'</a>; <a href=
=3D"mailto:db3546@att.com">'db3546'</a></div><div><b>Subject:</b>&nbsp;RE:=
 [mpls] MPLS working group last call on draft-ietf-mpls-lsp-ping-relay-rep=
ly</div></div></div><div><div>Lizhong,</div>=0A<div>&nbsp;</div>=0A<div>Ap=
ologies, I fumbled your response.</div>=0A<div>&nbsp;</div>=0A<div>I snipp=
ed out the stuff we agree on.</div>=0A<div>&nbsp;</div>=0A<div>&gt; Thank =
you for the review. Please see my reply inline below. Correct me</div>=0A<=
div>&gt; if other authors have different opinion.</div>=0A<div>&gt;</div>=
=0A<div>&gt; I will update the draft after the end of last call.</div>=0A<=
div>&nbsp;</div>=0A<div>&gt;&gt; Just being a good citizen and reviewing t=
his I-D during WG last call.</div>=0A<div>&gt;&gt; I didn't have much time=
 so I only found a number of nits most of which</div>=0A<div>&gt;&gt; are =
probably not significant.</div>=0A<div>&gt;&gt; ---</div>=0A<div>&gt;&gt; =
</div>=0A<div>&gt;&gt; idnits notes the presence of a pre-RFC5378 disclaim=
er. Do you really </div>=0A<div>&gt;&gt; need that?</div>=0A<div>&gt;&gt; =
[Lizhong] this may need the answer from chairs and AD. We only follow</div=
>=0A<div>&gt;&gt; the rules.</div>=0A<div>&nbsp;</div>=0A<div>If you are f=
ollowing the rules, that's fine. I think the rules are that you only</div>=
=0A<div>need to include the disclaimer if text included in the document wa=
s written</div>=0A<div>before the date of RFC 5378 and if at least one of =
the authors of the text has</div>=0A<div>not given up their copyright as d=
escribed in that RFC.</div>=0A<div>&nbsp;</div>=0A<div>[snip]</div>=0A<div=
>&nbsp;</div>=0A<div>&gt;&gt; Section 4.1</div>=0A<div>&gt;&gt;&nbsp;</div=
>=0A<div>&gt;&gt;&nbsp;&nbsp; The source UDP port field MUST be set</div>=
=0A<div>&gt;&gt;&nbsp;&nbsp; to the source UDP port.</div>=0A<div>&gt;&gt;=
&nbsp;</div>=0A<div>&gt;&gt; There is no "source UDP port" field. Perhaps =
the "Initiator Source Port"</div>=0A<div>&gt;&gt; field?</div>=0A<div>&gt;=
&gt;&nbsp;</div>=0A<div>&gt;&gt; But also, this text is quite confusing. T=
he text in 3.2 is much clearer.</div>=0A<div>&gt; [Lizhong] yes, should be=
:&nbsp;</div>=0A<div>&gt; The source UDP port field MUST be set&nbsp;to th=
e initiator&nbsp;source port.</div>=0A<div>&nbsp;</div>=0A<div>Hmmm, I thi=
nk...</div>=0A<div>&nbsp;</div>=0A<div>"The Initiator Source Port field MU=
ST be set to the source UDP port."</div><div>[Lizhong] accepted.</div>=0A<=
div>&nbsp;</div>=0A<div>[snip]</div>=0A<div>&nbsp;</div>=0A<div>&gt; [Lizh=
ong] traceroute is not mandatory before ping. If operator has knowledge&nb=
sp;</div>=0A<div>&gt; of the relay nodes, the initiator could directly sen=
d ping with&nbsp;Relay Node&nbsp;</div>=0A<div>&gt; Address Stack TLV cont=
aining the already known relay nodes.</div>=0A<div>&nbsp;</div>=0A<div>Tha=
t would make a valuable addition to 4.1, as well.</div><div>[Lizhong] OK, =
then we could add the following in section 4 to avoid misunderstanding:</d=
iv><div><span style=3D"font-family: &quot;" times=3D"" new=3D"" roman'";=
=3D"" font-size:=3D"" 14px;=3D"" color:=3D"" rgb(0,=3D"" 0,=3D"" 0);=3D"" =
background-color:=3D"" rgba(0,=3D"" font-weight:=3D"" normal;=3D"" font-st=
yle:=3D"" normal;text-decoration:=3D"" none;'=3D"">In the following sectio=
n, we describe the relay reply procedures with traceroute&nbsp;</span></di=
v><div><span style=3D"font-family: &quot;" times=3D"" new=3D"" roman'";=3D=
"" font-size:=3D"" 14px;=3D"" color:=3D"" rgb(0,=3D"" 0,=3D"" 0);=3D"" bac=
kground-color:=3D"" rgba(0,=3D"" font-weight:=3D"" normal;=3D"" font-style=
:=3D"" normal;text-decoration:=3D"" none;'=3D"">operation. If operator has=
 knowledge of the relay nodes, the initiator could do LSP&nbsp;</span></di=
v><div><span style=3D"font-family: &quot;" times=3D"" new=3D"" roman'";=3D=
"" font-size:=3D"" 14px;=3D"" color:=3D"" rgb(0,=3D"" 0,=3D"" 0);=3D"" bac=
kground-color:=3D"" rgba(0,=3D"" font-weight:=3D"" normal;=3D"" font-style=
:=3D"" normal;text-decoration:=3D"" none;'=3D"">Ping by directly sending E=
cho Request with Relay Node Address Stack TLV&nbsp;</span></div><div><span=
 style=3D"font-family: &quot;" times=3D"" new=3D"" roman'";=3D"" font-size=
:=3D"" 14px;=3D"" color:=3D"" rgb(0,=3D"" 0,=3D"" 0);=3D"" background-colo=
r:=3D"" rgba(0,=3D"" font-weight:=3D"" normal;=3D"" font-style:=3D"" norma=
l;text-decoration:=3D"" none;'=3D"">containing the already known relay nod=
es.</span></div>=0A<div>&nbsp;</div>=0A<div>[snip]</div>=0A<div>&nbsp;</di=
v>=0A<div>&gt;&gt; I tried to work out how things would pan out if two ASe=
s on the path </div>=0A<div>&gt;&gt; used the same address space within th=
eir AS. Would an address appear in</div>=0A<div>&gt;&gt; the stack and see=
m to be routable when it is really an address in the</div>=0A<div>&gt;&gt;=
 other AS?</div>=0A<div>&gt; [Lizhong] we have an example in section 5. An=
d address of P1 and P2 could be&nbsp;</div>=0A<div>&gt; same. In that&nbsp=
;case, ASBR1 must&nbsp;adds its&nbsp;interface address facing ASBR2 with&n=
bsp;</div>=0A<div>&gt; the K bit set. Then relay reply will not be miss-ro=
uted.</div>=0A<div>&nbsp;</div>=0A<div>Ah, I get it.</div>=0A<div>But this=
 relies on ASBT1 setting the K bit. </div>=0A<div>So I suspect this needs =
to not be a special case: you need to require that the</div>=0A<div>domain=
 boundary always sets the K bit.</div><div>[Lizhong] yes, we use "SHOULD" =
to make the requirement. See below description in section 4.2:</div><div><=
span style=3D"font-family: &quot;" times=3D"" new=3D"" roman'";=3D"" font-=
size:=3D"" 14px;=3D"" color:=3D"" rgb(0,=3D"" 0,=3D"" 0);=3D"" background-=
color:=3D"" rgba(0,=3D"" font-weight:=3D"" normal;=3D"" font-style:=3D"" n=
ormal;text-decoration:=3D"" none;'=3D"">If a node spans two addressing dom=
ains (with respect to this=0A<br>	message) where nodes on either side may =
not be able to reach nodes in the=0A<br>	other domain, then the final addr=
ess added SHOULD set the K bit.</span></div>=0A<div>&nbsp;</div>=0A<div>[s=
nip]</div>=0A<div>&nbsp;</div>=0A<div>&gt;&gt; The third case in 4.5 is wh=
en the receiver does not understand the TLV</div>=0A<div>&gt;&gt; and igno=
res it. In this case it will send an Echo Reply without itself</div>=0A<di=
v>&gt;&gt; including the TLV.</div>=0A<div>&gt; [Lizhong] the receiver is =
unable to send the Echo Reply, because it does</div>=0A<div>&gt; know the =
destination IP address and UDP port number. So if the receiver</div>=0A<di=
v>&gt; could not understand the TLV, then the relay message will be droppe=
d.</div>=0A<div>&nbsp;</div>=0A<div>Section 4.5 of 4379 says:</div>=0A<div=
>&nbsp;</div>=0A<div>&nbsp;&nbsp; The destination IP address and UDP port =
are copied from the</div>=0A<div>&nbsp;&nbsp; source IP address and UDP po=
rt of the echo request.</div>=0A<div>&nbsp;</div>=0A<div>That is what the =
legacy receiver will attempt to do. It doesn't matter whether</div>=0A<div=
>the optional Relay Node Address Stack TLV is in the echo request message =
or not,</div>=0A<div>the legacy node will follow 4379. So it *will* be abl=
e to respond.</div><div>[Lizhong] Are you referring the case when the rece=
iver receives&nbsp;<span style=3D"font-family: &quot;" times=3D"" new=3D""=
 roman'";=3D"" font-size:=3D"" 14px;=3D"" color:=3D"" rgb(0,=3D"" 0,=3D"" =
0);=3D"" background-color:=3D"" rgba(0,=3D"" font-weight:=3D"" normal;=3D"=
" font-style:=3D"" normal;text-decoration:=3D"" none;'=3D"">Echo Request? =
In that</span></div><div>case, yes, it will respond without including the =
TLV. It is a sub-case of case 1. And I</div><div>will add the following in=
 the first case:</div><div><div>If the receiver does not recognize the&nbs=
p;<span style=3D"font-family: ''; font-size: 10.5pt; line-height: 1.5; bac=
kground-color: window;">Relay Node Address Stack&nbsp;</span><span style=
=3D"font-size: 10.5pt; line-height: 1.5; background-color: window;">TLV, a=
s per&nbsp;</span></div><div><span style=3D"font-family: ''; font-size: 10=
.5pt; line-height: 1.5; background-color: window;">section 3 and 4.5 of [R=
FC4379], it will</span><span style=3D"background-color: window; font-size:=
 10.5pt; line-height: 1.5;">&nbsp;send an Echo Reply without&nbsp;</span><=
span style=3D"font-size: 10.5pt; line-height: 1.5; background-color: windo=
w;">including the TLV.</span></div></div><div>If you are referring&nbsp;<s=
pan style=3D"font-size: 10.5pt; line-height: 1.5; background-color: window=
;">the case when the receiver receives&nbsp;</span><span style=3D"font-fam=
ily: ''; font-size: 10.5pt; line-height: 1.5; background-color: window;">R=
elayed Echo Reply, if it could</span></div><div><span style=3D"font-family=
: ''; font-size: 10.5pt; line-height: 1.5; background-color: window;">not =
understand the TLV, it will also not understand the message type "</span><=
span style=3D"font-family: ''; font-size: 10.5pt; line-height: 1.5; backgr=
ound-color: window;">Relayed Echo Reply</span><span style=3D"background-co=
lor: window; font-family: ''; font-size: 10.5pt; line-height: 1.5;">".</sp=
an></div><div><span style=3D"background-color: window; font-family: ''; fo=
nt-size: 10.5pt; line-height: 1.5;">So the packet will be dropped.</span><=
/div>=0A<div>&nbsp;</div>=0A<div>&gt;&gt; Section 6 should note that the n=
ew TLV provides a way for Echo Reply</div>=0A<div>&gt;&gt; messages to be =
diverted so that information can be collected. For</div>=0A<div>&gt;&gt; e=
xample, if a stack entry can be inserted, the Echo Reply messages can</div=
>=0A<div>&gt;&gt; be caused to transit another AS unrelated to the LSP und=
er test. Since</div>=0A<div>&gt;&gt; the Echo Reply reveals path informati=
on about the LSP, this is a</div>=0A<div>&gt;&gt; valuable attack.&nbsp; H=
aving said that, you can say how this TLV is </div>=0A<div>&gt;&gt; protec=
ted in the Echo Reply message.</div>=0A<div>&gt;</div>=0A<div>&gt; [Lizhon=
g] Do you mean the new TLV could be used to collect path information</div>=
=0A<div>&gt; unrelated to the LSP under test? This is not true. Only the n=
ode along the</div>=0A<div>LSP&nbsp;</div>=0A<div>&gt; will add path infor=
mation into the new TLV. The relay node in the new TLV</div>=0A<div>&gt; w=
ill only relay the Echo Reply to the initiator, and will not add informati=
on</div>=0A<div>to</div>=0A<div>&gt; the new TLV.</div>=0A<div>&nbsp;</div=
>=0A<div>I think you misunderstand how security attacks might work. Suppos=
e I am able to</div>=0A<div>do one of two things:</div>=0A<div>1. Modify t=
he control plane code on a router that adds or processes a</div>=0A<div>&n=
bsp;&nbsp;&nbsp; Relay Node Address Stack TLV so that it adds a bogus entr=
y to the</div>=0A<div>&nbsp;&nbsp;&nbsp;&nbsp; TLV. The prospect of modifi=
cations to control plane code is generally</div>=0A<div>&nbsp;&nbsp;&nbsp;=
&nbsp; considered to be so disastrous that it is just noted without any </=
div>=0A<div>&nbsp;&nbsp;&nbsp;&nbsp; further precautions (after all, if yo=
u can get at the control plane</div>=0A<div>&nbsp;&nbsp;&nbsp;&nbsp; code,=
 you can make the routers do anything).</div>=0A<div>2. Intercept and modi=
fy a packet in transit. This is the main risk I am </div>=0A<div>&nbsp;&nb=
sp;&nbsp; talking about.</div><div>[Lizhong] If one router's control plane=
 in the network is&nbsp;<span style=3D"font-family: ''; font-size: 10.5pt;=
 line-height: 1.5; background-color: window;">hijacked,&nbsp;</span><span =
style=3D"background-color: window; font-family: ''; font-size: 10.5pt; lin=
e-height: 1.5;">it could send any&nbsp;</span></div><div><span style=3D"ba=
ckground-color: window; font-family: ''; font-size: 10.5pt; line-height: 1=
.5;">information to the third party. It is a general problem. But I unders=
tand you concern.</span></div><div><span style=3D"background-color: window=
; font-family: ''; font-size: 10.5pt; line-height: 1.5;">I will add the fo=
llowing to try to mitigate your concern.</span></div><div><span style=3D"f=
ont-family: ''; font-size: 10.5pt; line-height: 1.5; background-color: win=
dow;">The</span><span style=3D"font-size: 10.5pt; line-height: 1.5; backgr=
ound-color: window;">&nbsp;</span><span style=3D"font-size: 10.5pt; line-h=
eight: 1.5; background-color: window;">Relay Node Address Stack TLV has th=
e path information of the LSP, and&nbsp;</span></div><div><span style=3D"f=
ont-family: ''; font-size: 10.5pt; line-height: 1.5; background-color: win=
dow;">such information may be maliciously used by any uncontrolled LSR/LER=
. We have</span></div><div><span style=3D"font-family: ''; font-size: 10.5=
pt; line-height: 1.5; background-color: window;">two ways to reduce the pa=
th information in the TLV:</span></div><div><span style=3D"font-family: ''=
; font-size: 10.5pt; line-height: 1.5; background-color: window;">1. it is=
 recommended to clear the K bit in the relay address entry unless you have=
 to.</span></div><div><span style=3D"font-family: ''; font-size: 10.5pt; l=
ine-height: 1.5; background-color: window;">2. it is encouraged to use&nbs=
p;</span><span style=3D"font-family: &quot;" times=3D"" new=3D"" roman'";=
=3D"" font-size:=3D"" 14px;=3D"" color:=3D"" rgb(0,=3D"" 0,=3D"" 0);=3D"" =
background-color:=3D"" rgb(255,=3D"" 255,=3D"" 255);=3D"" font-weight:=3D"=
" normal;=3D"" font-style:=3D"" normal;text-decoration:=3D"" none;'=3D"">N=
IL address entry to hide node information if possible.</span></div><div><s=
pan style=3D"font-size: 10.5pt; line-height: 1.5; background-color: window=
;">&nbsp;</span></div>=0A<div>Cheers,</div>=0A<div>Adrian</div>=0A<div>&nb=
sp;</div>=0A</div></blockquote>=0A</body></html>
------=_001_NextPart748001227483_=------


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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>, "draft-farrelll-mpls-opportunistic-encrypt@tools.ietf.org" <draft-farrelll-mpls-opportunistic-encrypt@tools.ietf.org>
Thread-Topic: [mpls] Poll to see if we have consensus to adopt draft-farrelll-mpls-opportunistic-encrypt as an MPLS wg document
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Date: Thu, 18 Jun 2015 09:46:49 +0000
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Cc: "mpls-chairs@tools.ietf.org" <mpls-chairs@tools.ietf.org>
Subject: Re: [mpls] Poll to see if we have consensus to adopt draft-farrelll-mpls-opportunistic-encrypt as an MPLS wg document
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Support.

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com

-----Original Message-----
From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson
Sent: Thursday, June 18, 2015 12:12 PM
To: mpls@ietf.org; draft-farrelll-mpls-opportunistic-encrypt@tools.ietf.org
Cc: mpls-chairs@tools.ietf.org
Subject: [mpls] Poll to see if we have consensus to adopt draft-farrelll-mp=
ls-opportunistic-encrypt as an MPLS wg document

Working Group,

This is to start a two week poll on adopting draft-farrelll-
mpls-opportunistic-encrypt-05 as an MPLS working group document.

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 are no IPR disclosures directly against this document. An IPR poll ha=
s been started in parallel to the adoption poll.

This poll ends July 2, 2015.

/Loa
MPLS wg co-chair
--=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


From nobody Thu Jun 18 03:56:43 2015
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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'Loa Andersson'" <loa@pi.nu>
References: <55828B72.1070401@pi.nu>
In-Reply-To: <55828B72.1070401@pi.nu>
Date: Thu, 18 Jun 2015 11:56:33 +0100
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Cc: draft-farrelll-mpls-opportunistic-encrypt@tools.ietf.org, mpls@ietf.org, mpls-chairs@tools.ietf.org
Subject: Re: [mpls] IPR poll on draft-farrelll-mpls-opportunistic-encrypt
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Loa,

I'm unaware of many things, and one of those things is any IPR that =
applies to this draft.

Thanks,
Adrian

> -----Original Message-----
> From: Loa Andersson [mailto:loa@pi.nu]
> Sent: 18 June 2015 10:12
> To: mpls@ietf.org; =
draft-farrelll-mpls-opportunistic-encrypt@tools.ietf.org
> Cc: mpls-chairs@tools.ietf.org
> Subject: IPR poll on draft-farrelll-mpls-opportunistic-encrypt
>=20
> Working Group,
>=20
> We have started a working group adoption poll on
> draft-farrelll-mpls-opportunistic-encrypt
>=20
> We will do an IPR poll in parallel to the adoption poll.
>=20
> This mail starts the IPR poll.
>=20
> Are you aware of any IPR that applies to draft-farrelll-
> mpls-opportunistic-encrypt?
>=20
> If so, has this IPR been disclosed in compliance with IETF IPR rules
> (see RFCs 3979, 4879, 3669 and 5378 for more details).
>=20
> Currently there are no IPR disclosure that relate to this document.
>=20
> 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.
>=20
> 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.
>=20
>=20
> /Loa
>=20
> (as MPLS WG co-chair)
>=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


From nobody Thu Jun 18 04:01:46 2015
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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'Loa Andersson'" <loa@pi.nu>, <mpls@ietf.org>
References: <55828B69.3070603@pi.nu>
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Subject: Re: [mpls] Poll to see if we have consensus to adopt draft-farrelll-mpls-opportunistic-encrypt as an MPLS wg document
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Speaking as a co-author of this draft I am enthusiastic about getting =
more eyes on the material and particularly an understanding of whether =
the proposal is practical in implementation.

I think that bringing the work inside the working group will help =
achieve that.

Cheers,
Adrian

> -----Original Message-----
> From: Loa Andersson [mailto:loa@pi.nu]
> Sent: 18 June 2015 10:12
> To: mpls@ietf.org; =
draft-farrelll-mpls-opportunistic-encrypt@tools.ietf.org
> Cc: mpls-chairs@tools.ietf.org
> Subject: Poll to see if we have consensus to adopt =
draft-farrelll-mpls-
> opportunistic-encrypt as an MPLS wg document
>=20
> Working Group,
>=20
> This is to start a two week poll on adopting draft-farrelll-
> mpls-opportunistic-encrypt-05 as an MPLS working group document.
>=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 are no IPR disclosures directly against this document. An IPR
> poll has been started in parallel to the adoption poll.
>=20
> This poll ends July 2, 2015.
>=20
> /Loa
> MPLS wg co-chair
> --
>=20
>=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 Thu Jun 18 07:04:35 2015
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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Thu, 18 Jun 2015 07:04:05 -0700
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Subject: Re: [mpls] Poll to see if we have consensus to adopt draft-farrelll-mpls-opportunistic-encrypt as an MPLS wg document
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--047d7b8738d00b58ca0518cb498c
Content-Type: text/plain; charset=UTF-8

Loa,

I support the adoption of this draft.

Thanks,
Andy

On Thu, Jun 18, 2015 at 2:12 AM, Loa Andersson <loa@pi.nu> wrote:

> Working Group,
>
> This is to start a two week poll on adopting draft-farrelll-
> mpls-opportunistic-encrypt-05 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 are no IPR disclosures directly against this document. An IPR
> poll has been started in parallel to the adoption poll.
>
> This poll ends July 2, 2015.
>
> /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
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

--047d7b8738d00b58ca0518cb498c
Content-Type: text/html; charset=UTF-8
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<div dir=3D"ltr">Loa,<div><br></div><div>I support the adoption of this dra=
ft.</div><div><br></div><div>Thanks,</div><div>Andy</div></div><div class=
=3D"gmail_extra"><br><div class=3D"gmail_quote">On Thu, Jun 18, 2015 at 2:1=
2 AM, Loa Andersson <span dir=3D"ltr">&lt;<a href=3D"mailto:loa@pi.nu" targ=
et=3D"_blank">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">Working Group,<br>
<br>
This is to start a two week poll on adopting draft-farrelll-<br>
mpls-opportunistic-encrypt-05 as an MPLS working group document.<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 are no IPR disclosures directly against this document. An IPR<br>
poll has been started in parallel to the adoption poll.<br>
<br>
This poll ends July 2, 2015.<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>
_______________________________________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
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arget=3D"_blank">https://www.ietf.org/mailman/listinfo/mpls</a><br>
</font></span></blockquote></div><br></div>

--047d7b8738d00b58ca0518cb498c--


From nobody Thu Jun 18 09:29:11 2015
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Date: Thu, 18 Jun 2015 17:29:01 +0100
From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Subject: Re: [mpls] IPR poll on draft-farrelll-mpls-opportunistic-encrypt
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On 18/06/15 11:56, Adrian Farrel wrote:
> Loa,
> 
> I'm unaware of many things, and one of those things is any IPR that applies to this draft.

I also unaware of any IPR that applies to this draft.

S.


> 
> Thanks,
> Adrian
> 
>> -----Original Message-----
>> From: Loa Andersson [mailto:loa@pi.nu]
>> Sent: 18 June 2015 10:12
>> To: mpls@ietf.org; draft-farrelll-mpls-opportunistic-encrypt@tools.ietf.org
>> Cc: mpls-chairs@tools.ietf.org
>> Subject: IPR poll on draft-farrelll-mpls-opportunistic-encrypt
>>
>> Working Group,
>>
>> We have started a working group adoption poll on
>> draft-farrelll-mpls-opportunistic-encrypt
>>
>> We will do an IPR poll in parallel to the adoption poll.
>>
>> This mail starts the IPR poll.
>>
>> Are you aware of any IPR that applies to draft-farrelll-
>> mpls-opportunistic-encrypt?
>>
>> 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 no IPR disclosure that relate 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.
>>
>>
>> /Loa
>>
>> (as 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
> 
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
> 


From nobody Thu Jun 18 09:31:50 2015
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From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Cc: draft-farrelll-mpls-opportunistic-encrypt@tools.ietf.org, mpls-chairs@tools.ietf.org
Subject: Re: [mpls] Poll to see if we have consensus to adopt draft-farrelll-mpls-opportunistic-encrypt as an MPLS wg document
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Seems odd to "support" one's own draft, but sure, I do:-)

I think defining this mechanism at this layer fills a gap
in the set of ways in which we can defend networks so is
well worth doing.

S.


On 18/06/15 12:01, Adrian Farrel wrote:
> Speaking as a co-author of this draft I am enthusiastic about getting
> more eyes on the material and particularly an understanding of
> whether the proposal is practical in implementation.
> 
> I think that bringing the work inside the working group will help
> achieve that.
> 
> Cheers, Adrian
> 
>> -----Original Message----- From: Loa Andersson [mailto:loa@pi.nu] 
>> Sent: 18 June 2015 10:12 To: mpls@ietf.org;
>> draft-farrelll-mpls-opportunistic-encrypt@tools.ietf.org Cc:
>> mpls-chairs@tools.ietf.org Subject: Poll to see if we have
>> consensus to adopt draft-farrelll-mpls- opportunistic-encrypt as an
>> MPLS wg document
>> 
>> Working Group,
>> 
>> This is to start a two week poll on adopting draft-farrelll- 
>> mpls-opportunistic-encrypt-05 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 are no IPR disclosures directly against this document. An
>> IPR poll has been started in parallel to the adoption poll.
>> 
>> This poll ends July 2, 2015.
>> 
>> /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
> 
> 


From nobody Thu Jun 18 12:27:25 2015
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: "Osborne, Eric" <eric.osborne@level3.com>, "Yaakov Stein (yaakov_s@rad.com)" <yaakov_s@rad.com>, Lucy yong <lucy.yong@huawei.com>, "draft-mirsky-mpls-residence-time@tools.ietf.org" <draft-mirsky-mpls-residence-time@tools.ietf.org>, "mpls-chairs@tools.ietf.org" <mpls-chairs@tools.ietf.org>, Markus Jork <mjork@juniper.net>
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Subject: Re: [mpls] MPLS_RT review of draft-mirsky-mpls-residence-time-06.txt
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--_003_7347100B5761DC41A166AC17F22DF1121B9DE1F0eusaamb103erics_
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Hi Lucy, Markus, Eric, and Yaakov,
many thanks for your kind consideration and thoughtful comments. Attached a=
re new version of the draft and diff that highlights changes proposed. Grea=
tly appreciate your review and hope that you find your comments being addre=
ssed, mostly if not completely.

	Regards,
		Greg


-----Original Message-----
From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Osborne, Eric
Sent: Tuesday, May 26, 2015 6:45 AM
To: Lucy yong; draft-mirsky-mpls-residence-time@tools.ietf.org; mpls-chairs=
@tools.ietf.org
Cc: mpls@ietf.org
Subject: Re: [mpls] MPLS_RT review of draft-mirsky-mpls-residence-time-06.t=
xt

I finally had some time to read this draft as well.  I agree with Lucy's ge=
neral comments - this doc seems to achieve the goal it sets out.  Is it use=
ful?  Not to me.  It seems like it's maybe for mobile networks?  I'm not an=
 expert in the matter of timing so this review assumes that the actual timi=
ng procedures work.  My comments below are about how RTM fits into the larg=
er picture.


General question: does RTM work over LAGs?  They're a flavor of ECMP in som=
e respects.  If not, that needs to be spelled out somewhere.

It might be worth spending a few lines in the introduction talking about wh=
o might want to use this and what sort of restrictions it places on a netwo=
rk design.



Specific comments:

Section 4 talks about LDP and ECMP and the problems it causes.  It suggests=
 that one solution is to disable ECMP used for RTM LSPs.  This seems like i=
t would only make the problem worse; the more you separate the OAM path fro=
m the actual data path, the less useful your measurements are.  You may be =
far better off just saying "don't do RTM with MP2P LSPs".

Section 4.1, "LSAs sent from an interface".  This doesn't line up with how =
link-state protocols work.  There should be no property of an LSA dependant=
 upon the interface that it's sent out (OK, modulo type 9 opaques and stuff=
).  I think this really wants to say "LSAs sent from a router which describ=
e a particular interface". =20


Section 4.5 could use a review from an ISIS expert.  I scanned the GENINFO =
TLV and it's not clear to me how RTM will associate a capability with a spe=
cific interface between peers.  What if I have several interfaces between A=
-B and only some of them support RTM?  I'm not saying this isn't covered, b=
ut that it's not clear to me as a casual reader of Section 4.5 and GENINFO.

Section 4.6, "egress LSR's egress interface".  So if I have


A---B---C---D---E---F

a TE LSP B->E and IP nodes A and F, is section 4.6 really referring to the =
E->F interface?


What if I have a TE LSP A->F?  Where's the 'egress LSR's egress interface'?
What if I have a TE LSP A->C, C->E and E->F?  Or LDP A->C, TE C->E, LDP E->=
F?




eric



> -----Original Message-----
> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Lucy yong
> Sent: Wednesday, May 06, 2015 6:39 PM
> To: draft-mirsky-mpls-residence-time@tools.ietf.org; mpls-=20
> chairs@tools.ietf.org
> Cc: mpls@ietf.org
> Subject: Re: [mpls] MPLS_RT review of=20
> draft-mirsky-mpls-residence-time- 06.txt
>=20
> Hi All,
>=20
> I reviewed draft-mirsky-mpls-residence-time as the member of MPLS=20
> Review Team and have the following comments:
>=20
> is the document coherent?
>=20
> Yes. It specifies how MPLS supports residence time measurement.
>=20
> is it useful (ie, is it likely to be actually useful in operational netwo=
rks)?
>=20
> The document claims that such measurement can improve the accuracy of=20
> clock synchronization across the network. I am not an operator and=20
> author and not sure how useful this feature provides compared to the=20
> complexity adding to.
>=20
> is the document technically sound?
> Yes. The draft provides a detail solution in control plane and data=20
> plane to achieve this purpose.
>=20
> is the document ready to be considered for WG adoption?
> Yes. The document states the problem clearly and provides a solution=20
> to address this problem.
>=20
> IMHO:  after adopting it as the WG draft, the WG should further=20
> evaluate if control plane and data plane solution can be simplified.=20
> The areas may be
> considered:
> 1) Do we have to use IGP to announce node RTM capability? Can RSVP-TE=20
> resolve the issue by itself?
> 2) Will possible to enhance RRO to serve RSO purpose instead of=20
> carrying both RRO and RSO in the message?
> 3) Since this feature is designed for the LSP that is used for clock=20
> synchronization, such LSPs are not majority, so it should be option in=20
> LSP setup. Make that very clear.
> 4) two-step clock mode is quite complex. The description in Section 7=20
> is not clear to me why this mode is necessary.
>=20
> Regards,
> Lucy
>=20
> _______________________________________________
> 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

--_003_7347100B5761DC41A166AC17F22DF1121B9DE1F0eusaamb103erics_
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--_003_7347100B5761DC41A166AC17F22DF1121B9DE1F0eusaamb103erics_--


From nobody Thu Jun 18 12:28:57 2015
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>, "draft-farrelll-mpls-opportunistic-encrypt@tools.ietf.org" <draft-farrelll-mpls-opportunistic-encrypt@tools.ietf.org>
Thread-Topic: [mpls] Poll to see if we have consensus to adopt draft-farrelll-mpls-opportunistic-encrypt as an MPLS wg document
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Date: Thu, 18 Jun 2015 19:28:52 +0000
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Cc: "mpls-chairs@tools.ietf.org" <mpls-chairs@tools.ietf.org>
Subject: Re: [mpls] Poll to see if we have consensus to adopt draft-farrelll-mpls-opportunistic-encrypt as an MPLS wg document
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yes/support

	Regards,
		Greg

-----Original Message-----
From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson
Sent: Thursday, June 18, 2015 2:12 AM
To: mpls@ietf.org; draft-farrelll-mpls-opportunistic-encrypt@tools.ietf.org
Cc: mpls-chairs@tools.ietf.org
Subject: [mpls] Poll to see if we have consensus to adopt draft-farrelll-mp=
ls-opportunistic-encrypt as an MPLS wg document

Working Group,

This is to start a two week poll on adopting draft-farrelll-
mpls-opportunistic-encrypt-05 as an MPLS working group document.

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 are no IPR disclosures directly against this document. An IPR poll ha=
s been started in parallel to the adoption poll.

This poll ends July 2, 2015.

/Loa
MPLS wg co-chair
--=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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Subject: [mpls] RFC 7555 on Proxy MPLS Echo Request
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A new Request for Comments is now available in online RFC libraries.

        
        RFC 7555

        Title:      Proxy MPLS Echo Request 
        Author:     G. Swallow, V. Lim, S. Aldrin
        Status:     Standards Track
        Stream:     IETF
        Date:       June 2015
        Mailbox:    swallow@cisco.com, 
                    vlim@cisco.com, 
                    aldrin.ietf@gmail.com
        Pages:      28
        Characters: 62109
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-mpls-proxy-lsp-ping-05.txt

        URL:        https://www.rfc-editor.org/info/rfc7555

        DOI:        http://dx.doi.org/10.17487/RFC7555

This document defines a means of remotely initiating Multiprotocol Label
Switched Protocol (MPLS) Pings on Label Switched Paths.  An MPLS Proxy Ping
Request is sent to any Label Switching Router along a Label Switched Path.
The primary motivations for this facility are first to limit the number of
messages and related processing when using LSP Ping in large
Point-to-Multipoint LSPs, and second to enable tracing from leaf to leaf 
(or root).

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 
memo is unlimited.

This announcement is sent to the IETF-Announce and rfc-dist lists.
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The RFC Editor Team
Association Management Solutions, LLC



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From: "Tarek Saad (tsaad)" <tsaad@cisco.com>
To: "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: Slot requests for MPLS WG sessions - IETF 93 - Prague
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Subject: [mpls] Slot requests for MPLS WG sessions - IETF 93 - Prague
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--_000_D1AC537229EB7tsaadciscocom_
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Hi all,

We are starting to build the MPLS WG agenda for Prague IETF93. The prelimin=
ary IETF93 agenda, is available at:
https://datatracker.ietf.org/meeting/93/agenda.html

The MPLS WG sessions are scheduled on:
Wednesday, July 22 afternoon session III, 17:40-19:40
and
Thursday, July 23 afternoon session III, 17:40-19:10

Please send (reply to this e-mail and copy myself and the MPLS co-chairs) y=
our requests for a presentation slot. Please indicate: draft name, speaker =
and desired duration (covering presentation + Q&As).
Please send your requests by June 25th, 2015.
If presenting, your slides will be due on Sunday July 19, 2015. Please send=
 slides to the addresses above.

Regards,
Tarek




--_000_D1AC537229EB7tsaadciscocom_
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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-lin=
e-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-fami=
ly: Calibri, sans-serif;">
<div style=3D"color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-s=
ize: 14px;">
Hi all,</div>
<div style=3D"color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-s=
ize: 14px;">
<br>
</div>
<div>
<div><font face=3D"Calibri,sans-serif">We are starting to build the MPLS WG=
 agenda for Prague IETF93. The preliminary IETF93 agenda, is available at:<=
/font></div>
<div><a href=3D"https://datatracker.ietf.org/meeting/93/agenda.html" style=
=3D"font-family: Calibri, sans-serif; font-size: 14px;">https://datatracker=
.ietf.org/meeting/93/agenda.html</a></div>
<div><font face=3D"Calibri,sans-serif"><br>
</font></div>
<div><font face=3D"Calibri,sans-serif">The MPLS WG sessions are scheduled o=
n:</font></div>
<div><font face=3D"Calibri,sans-serif">Wednesday, July 22&nbsp;</font><font=
 face=3D"Calibri,sans-serif">afternoon session III,&nbsp;</font><span style=
=3D"font-family: Calibri, sans-serif;">17:40-19:40</span></div>
<div><span style=3D"font-family: Calibri, sans-serif;">and</span></div>
<div><font face=3D"Calibri,sans-serif">Thursday, July 23&nbsp;</font><font =
face=3D"Calibri,sans-serif">afternoon session III,&nbsp;</font><span style=
=3D"font-family: Calibri, sans-serif;">17:40-19:10</span></div>
<div><br>
</div>
<div><font face=3D"Calibri,sans-serif">Please send (reply to this e-mail an=
d copy myself and the MPLS co-chairs) your requests for a presentation slot=
. Please indicate: draft name, speaker and desired duration (covering prese=
ntation &#43; Q&amp;As).</font></div>
<div><span style=3D"font-family: Calibri, sans-serif; font-size: 14px;">Ple=
ase send your requests by June 25th, 2015.</span></div>
<div><font face=3D"Calibri,sans-serif">If presenting, your slides will be d=
ue on Sunday July 19, 2015. Please send slides to the addresses above.</fon=
t></div>
</div>
<div style=3D"color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-s=
ize: 14px;">
<br>
</div>
<div style=3D"color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-s=
ize: 14px;">
Regards,</div>
<div style=3D"color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-s=
ize: 14px;">
Tarek</div>
<div style=3D"color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-s=
ize: 14px;">
<br>
</div>
<div style=3D"color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-s=
ize: 14px;">
<br>
</div>
<div style=3D"color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-s=
ize: 14px;">
<br>
</div>
</body>
</html>

--_000_D1AC537229EB7tsaadciscocom_--


From nobody Sun Jun 21 14:58:05 2015
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From: "Nagendra Kumar Nainar (naikumar)" <naikumar@cisco.com>
To: Jeffrey Haas <jhaas@pfrc.org>, "rtg-bfd@ietf.org" <rtg-bfd@ietf.org>
Thread-Topic: [mpls] Working Group Last Call for draft-ietf-bfd-rfc5884-clarifications
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Hi,

Support.

(Sorry for the delay)

-Nagendra

On 5/4/15, 3:58 PM, "Jeffrey Haas" <jhaas@pfrc.org> wrote:

>The BFD mailing list has been quiet since shortly after IETF 92.  We have
>a
>number of documents that seem stable and ready to advance.
>
>This email begins a two week Working Group Last Call for
>draft-ietf-bfd-rfc5884-clarifications-01, Clarifications to RFC 5884.
>
>This last call will end on May 15.
>
>Simultaneously, the authors of this draft should state to the mailing list
>whether there is any IPR associated with this draft or not.
>
>This WGLC is also being cc'd to mpls@ietf to permit additional commentary.
>
>-- Jeff and Nobo
>
>_______________________________________________
>mpls mailing list
>mpls@ietf.org
>https://www.ietf.org/mailman/listinfo/mpls


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Subject: Re: [mpls] Poll to see if we have consensus to adopt draft-farrelll-mpls-opportunistic-encrypt as an MPLS wg document
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I don't think we can tell yet whether this draft really provides a good 
basis for future work.  As such, it seems premature for the WG to adopt 
it.  I think there are several major issues that should be confronted first.

The draft seems heavily focused on P2P LSPs.  That wouldn't be a problem 
if it were about pseudowire security.  But it's a big problem if the 
draft is supposed to apply to MPLS generally.  There's a lot of MPLS out 
there that uses LDP or BGP (or even IGP) to bind labels to address 
prefixes, thereby creating MP2P LSPs.  If that's not going to be 
handled, I don't see how the draft can claim to be providing an MPLS 
security scheme.

Of course, it could be that MPLS is not the right layer for security; 
I'm not sure that any one security scheme is going to be suitable for 
all uses of MPLS.

The idea of applying security on a per-LSP basis doesn't really seem 
right either.  In VPN, with per-address-prefix labeling, there could be 
hundreds of thousands of LSPs.  I can see someone claiming that security 
needs to be provided on a VRF-to-VRF basis rather than on a PE-to-PE 
basis, but having security on a per-address-prefix basis seems like way 
too much granularity.  I can't really tell from the draft how it would 
be intended to apply to VPN, so I don't really know what the authors 
have in mind for securing VPNs.

The draft would really benefit from having some worked out examples of 
how MPLS security would work in various VPN deployment scenarios, 
including the following (and combinations thereof):

- Multi-AS VPN with "option b" interconnect

- Multi-AS VPN with "option c" interconnect

- VPN with per-address-prefix labels assigned by BGP

- VPN with per-VRF labels assigned by BGP

The multi-AS VPN cases are particularly interesting, because they make 
use (in different ways) of nested LSPs.  Someone who wants privacy for 
his VPN traffic will want security applied to the inner LSP (the one 
that goes from the ingress PE to the egress PE), not just to the outer 
LSPs (the ones that go from ingress PE to ASBR, etc.) but it's not clear 
whether any of the techniques in the draft can be used that way.

There are also cases where labels get assigned to anycast addresses.  I 
wonder how the security scheme would be applied to those cases.

There are other issues in the draft as well, such as whether 
MPLS-specific hop-by-hop security is really useful when one can use 
simpler layer 2 security schemes instead.  But right now my main concern 
is that the end-to-end scheme will turn out to have very limited 
applicability.

Working out some realistic examples would help us understand whether 
this is really the right way to proceed.



From nobody Mon Jun 22 10:21:50 2015
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From: Ross Callon <rcallon@juniper.net>
To: "mpls@ietf.org" <mpls@ietf.org>, "alexander.vainshtein@ecitele.com" <alexander.vainshtein@ecitele.com>, "loa@mail01.huawei.com" <loa@mail01.huawei.com>, "adrian@olddog.co.uk" <adrian@olddog.co.uk>
Thread-Topic: IPR poll on draft-vainshtein-mpls-gal-tc-ttl-handling
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Subject: [mpls] IPR poll on draft-vainshtein-mpls-gal-tc-ttl-handling
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Working Group,

The authors of draft-vainshtein-mpls-gal-tc-ttl-handling have told us that =
the
draft is ready to be polled to see if we have consensus to make it a workin=
g
group document.

Before we start the adoption poll we will do an IPR poll. This mail starts =
the IPR poll.

Are you aware of any IPR that applies to draft-vainshtein-mpls-gal-tc-ttl-h=
andling?

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 no IPR disclosures that relate 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.

Ross
(as MPLS WG co-chair)


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<div>Working Group,</div>
<div>&nbsp;</div>
<div>The authors of draft-vainshtein-mpls-gal-tc-ttl-handling have told us =
that the </div>
<div>draft is ready to be polled to see if we have consensus to make it a w=
orking</div>
<div>group document.</div>
<div>&nbsp;</div>
<div>Before we start the adoption poll we will do an IPR poll. This mail st=
arts the IPR poll. </div>
<div>&nbsp;</div>
<div>Are you aware of any IPR that applies to draft-vainshtein-mpls-gal-tc-=
ttl-handling?</div>
<div>&nbsp;</div>
<div>If so, has this IPR been disclosed in compliance with IETF IPR rules</=
div>
<div>(see RFCs 3979, 4879, 3669 and 5378 for more details).</div>
<div>&nbsp;</div>
<div>Currently there are no IPR disclosures that relate to this document.</=
div>
<div>&nbsp;</div>
<div>If you are listed as a document author or contributor please respond t=
o</div>
<div>this email regardless of whether or not you are aware of any relevant<=
/div>
<div>IPR. *The response needs to be sent to the MPLS wg mailing list.* The<=
/div>
<div>document will not advance to the next stage until a response has been<=
/div>
<div>received from each author and contributor.</div>
<div>&nbsp;</div>
<div>If you are on the MPLS WG email list but are not listed as an author o=
r</div>
<div>contributor, then please explicitly respond only if you are aware of a=
ny</div>
<div>IPR that has not yet been disclosed in conformance with IETF rules.</d=
iv>
<div>&nbsp;</div>
<div>Ross</div>
<div>(as MPLS WG co-chair)</div>
<div>&nbsp;</div>
</span></font>
</body>
</html>

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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'Ross Callon'" <rcallon@juniper.net>, <mpls@ietf.org>, <alexander.vainshtein@ecitele.com>, <loa@mail01.huawei.com>
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Subject: Re: [mpls] IPR poll on draft-vainshtein-mpls-gal-tc-ttl-handling
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Hi Ross,
 
No, I'm not aware of any IPR concerning this draft.
 
A
 
From: Ross Callon [mailto:rcallon@juniper.net] 
Sent: 22 June 2015 18:22
To: mpls@ietf.org; alexander.vainshtein@ecitele.com; loa@mail01.huawei.com;
adrian@olddog.co.uk
Cc: mpls-chairs@ietf.org
Subject: IPR poll on draft-vainshtein-mpls-gal-tc-ttl-handling
 
Working Group,
 
The authors of draft-vainshtein-mpls-gal-tc-ttl-handling have told us that the 
draft is ready to be polled to see if we have consensus to make it a working
group document.
 
Before we start the adoption poll we will do an IPR poll. This mail starts the
IPR poll. 
 
Are you aware of any IPR that applies to
draft-vainshtein-mpls-gal-tc-ttl-handling?
 
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 no IPR disclosures that relate 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.
 
Ross
(as MPLS WG co-chair)
 

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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-GB link=3Dblue =
vlink=3Dpurple style=3D'tab-interval:36.0pt'><div =
class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-fon=
t-family:"Times New Roman";color:#1F497D'>Hi =
Ross,<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-fon=
t-family:"Times New Roman";color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-fon=
t-family:"Times New Roman";color:#1F497D'>No, I'm not aware of any IPR =
concerning this draft.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-fon=
t-family:"Times New Roman";color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-fon=
t-family:"Times New Roman";color:#1F497D'>A<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-fon=
t-family:"Times New =
Roman";color:#1F497D'><o:p>&nbsp;</o:p></span></p><div =
style=3D'border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt'><div><div style=3D'border:none;border-top:solid #B5C4DF =
1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=3DMsoNormal><b><span =
lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-f=
ont-family:"Times New =
Roman";mso-ansi-language:EN-US'>From:</span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-f=
ont-family:"Times New Roman";mso-ansi-language:EN-US'> Ross Callon =
[mailto:rcallon@juniper.net] <br><b>Sent:</b> 22 June 2015 =
18:22<br><b>To:</b> mpls@ietf.org; alexander.vainshtein@ecitele.com; =
loa@mail01.huawei.com; adrian@olddog.co.uk<br><b>Cc:</b> =
mpls-chairs@ietf.org<br><b>Subject:</b> IPR poll on =
draft-vainshtein-mpls-gal-tc-ttl-handling<o:p></o:p></span></p></div></di=
v><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>Working =
Group,<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>The authors of =
draft-vainshtein-mpls-gal-tc-ttl-handling have told us that the =
<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>draft is ready to be polled to see if we =
have consensus to make it a working<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>group =
document.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>Before we start the adoption poll we will =
do an IPR poll. This mail starts the IPR poll. =
<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>Are you aware of any IPR that applies to =
draft-vainshtein-mpls-gal-tc-ttl-handling?<o:p></o:p></span></p></div><di=
v><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>If so, has this IPR been disclosed in =
compliance with IETF IPR rules<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>(see RFCs 3979, 4879, 3669 and 5378 for =
more details).<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>Currently there are no IPR disclosures =
that relate to this document.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>If you are listed as a document author or =
contributor please respond to<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>this email regardless of whether or not =
you are aware of any relevant<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>IPR. *The response needs to be sent to =
the MPLS wg mailing list.* The<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>document will not advance to the next =
stage until a response has been<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>received from each author and =
contributor.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>If you are on the MPLS WG email list but =
are not listed as an author or<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>contributor, then please explicitly =
respond only if you are aware of any<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>IPR that has not yet been disclosed in =
conformance with IETF rules.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>Ross<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New Roman"'>(as MPLS WG =
co-chair)<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-fareast-=
font-family:"Times New =
Roman"'>&nbsp;<o:p></o:p></span></p></div></div></div></body></html>
------=_NextPart_000_0010_01D0AD1C.131E8080--


From nobody Mon Jun 22 13:00:36 2015
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To: Ross Callon <rcallon@juniper.net>
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Subject: Re: [mpls] IPR poll on draft-vainshtein-mpls-gal-tc-ttl-handling
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Ross,

No I'm not aware of any IPRs that relates to this draft.=20

/Loa

Sent from my iPad

> On 22 Jun 2015, at 19:21, Ross Callon <rcallon@juniper.net> wrote:
>=20
> Working Group,
> =20
> The authors of draft-vainshtein-mpls-gal-tc-ttl-handling have told us that=
 the
> draft is ready to be polled to see if we have consensus to make it a worki=
ng
> group document.
> =20
> Before we start the adoption poll we will do an IPR poll. This mail starts=
 the IPR poll.
> =20
> Are you aware of any IPR that applies to draft-vainshtein-mpls-gal-tc-ttl-=
handling?
> =20
> If so, has this IPR been disclosed in compliance with IETF IPR rules
> (see RFCs 3979, 4879, 3669 and 5378 for more details).
> =20
> Currently there are no IPR disclosures that relate to this document.
> =20
> 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.
> =20
> 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.
> =20
> Ross
> (as MPLS WG co-chair)
> =20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls

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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Ross,</div><div><br></div><div>No I'm not aware of any IPRs that relates to this draft.&nbsp;</div><div><br></div><div>/Loa<br><br>Sent from my iPad</div><div><br>On 22 Jun 2015, at 19:21, Ross Callon &lt;<a href="mailto:rcallon@juniper.net">rcallon@juniper.net</a>&gt; wrote:<br><br></div><blockquote type="cite"><div>

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<font face="Calibri" size="2"><span style="font-size:11pt;">
<div>Working Group,</div>
<div>&nbsp;</div>
<div>The authors of draft-vainshtein-mpls-gal-tc-ttl-handling have told us that the </div>
<div>draft is ready to be polled to see if we have consensus to make it a working</div>
<div>group document.</div>
<div>&nbsp;</div>
<div>Before we start the adoption poll we will do an IPR poll. This mail starts the IPR poll. </div>
<div>&nbsp;</div>
<div>Are you aware of any IPR that applies to draft-vainshtein-mpls-gal-tc-ttl-handling?</div>
<div>&nbsp;</div>
<div>If so, has this IPR been disclosed in compliance with IETF IPR rules</div>
<div>(see RFCs 3979, 4879, 3669 and 5378 for more details).</div>
<div>&nbsp;</div>
<div>Currently there are no IPR disclosures that relate to this document.</div>
<div>&nbsp;</div>
<div>If you are listed as a document author or contributor please respond to</div>
<div>this email regardless of whether or not you are aware of any relevant</div>
<div>IPR. *The response needs to be sent to the MPLS wg mailing list.* The</div>
<div>document will not advance to the next stage until a response has been</div>
<div>received from each author and contributor.</div>
<div>&nbsp;</div>
<div>If you are on the MPLS WG email list but are not listed as an author or</div>
<div>contributor, then please explicitly respond only if you are aware of any</div>
<div>IPR that has not yet been disclosed in conformance with IETF rules.</div>
<div>&nbsp;</div>
<div>Ross</div>
<div>(as MPLS WG co-chair)</div>
<div>&nbsp;</div>
</span></font>


</div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>mpls mailing list</span><br><span><a href="mailto:mpls@ietf.org">mpls@ietf.org</a></span><br><span><a href="https://www.ietf.org/mailman/listinfo/mpls">https://www.ietf.org/mailman/listinfo/mpls</a></span><br></div></blockquote></body></html>
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From nobody Tue Jun 23 00:03:35 2015
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: Ross Callon <rcallon@juniper.net>
Thread-Topic: IPR poll on draft-vainshtein-mpls-gal-tc-ttl-handling
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Subject: Re: [mpls] IPR poll on draft-vainshtein-mpls-gal-tc-ttl-handling
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Ross and all,

I am not aware of any IPR that applies to this draft.


Regards,

Sasha


________________________________
From: Ross Callon <rcallon@juniper.net>
Sent: Monday, June 22, 2015 8:21 PM
To: mpls@ietf.org; Alexander Vainshtein; loa@mail01.huawei.com; adrian@oldd=
og.co.uk
Cc: mpls-chairs@ietf.org
Subject: IPR poll on draft-vainshtein-mpls-gal-tc-ttl-handling

Working Group,

The authors of draft-vainshtein-mpls-gal-tc-ttl-handling have told us that =
the
draft is ready to be polled to see if we have consensus to make it a workin=
g
group document.

Before we start the adoption poll we will do an IPR poll. This mail starts =
the IPR poll.

Are you aware of any IPR that applies to draft-vainshtein-mpls-gal-tc-ttl-h=
andling?

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 no IPR disclosures that relate 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.

Ross
(as MPLS WG co-chair)


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<body dir=3D"ltr">
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ground-color:#FFFFFF;font-family:'Times New Roman', Times, serif;">
<p><br>
</p>
<p>Ross and all,</p>
<p>I am not aware of any IPR that applies to this draft.</p>
<p><br>
</p>
<p>Regards,</p>
<p>Sasha<br>
<br>
</p>
<div style=3D"color: rgb(0, 0, 0);">
<hr tabindex=3D"-1" style=3D"width: 98%; display: inline-block;">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font color=3D"#000000" face=3D"Calib=
ri, sans-serif" style=3D"font-size: 11pt;"><b>From:</b> Ross Callon &lt;rca=
llon@juniper.net&gt;<br>
<b>Sent:</b> Monday, June 22, 2015 8:21 PM<br>
<b>To:</b> mpls@ietf.org; Alexander Vainshtein; loa@mail01.huawei.com; adri=
an@olddog.co.uk<br>
<b>Cc:</b> mpls-chairs@ietf.org<br>
<b>Subject:</b> IPR poll on draft-vainshtein-mpls-gal-tc-ttl-handling</font=
>
<div>&nbsp;</div>
</div>
<div><font face=3D"Calibri" size=3D"2"><span style=3D"font-size: 11pt;">
<div>Working Group,</div>
<div>&nbsp;</div>
<div>The authors of draft-vainshtein-mpls-gal-tc-ttl-handling have told us =
that the
</div>
<div>draft is ready to be polled to see if we have consensus to make it a w=
orking</div>
<div>group document.</div>
<div>&nbsp;</div>
<div>Before we start the adoption poll we will do an IPR poll. This mail st=
arts the IPR poll.
</div>
<div>&nbsp;</div>
<div>Are you aware of any IPR that applies to draft-vainshtein-mpls-gal-tc-=
ttl-handling?</div>
<div>&nbsp;</div>
<div>If so, has this IPR been disclosed in compliance with IETF IPR rules</=
div>
<div>(see RFCs 3979, 4879, 3669 and 5378 for more details).</div>
<div>&nbsp;</div>
<div>Currently there are no IPR disclosures that relate to this document.</=
div>
<div>&nbsp;</div>
<div>If you are listed as a document author or contributor please respond t=
o</div>
<div>this email regardless of whether or not you are aware of any relevant<=
/div>
<div>IPR. *The response needs to be sent to the MPLS wg mailing list.* The<=
/div>
<div>document will not advance to the next stage until a response has been<=
/div>
<div>received from each author and contributor.</div>
<div>&nbsp;</div>
<div>If you are on the MPLS WG email list but are not listed as an author o=
r</div>
<div>contributor, then please explicitly respond only if you are aware of a=
ny</div>
<div>IPR that has not yet been disclosed in conformance with IETF rules.</d=
iv>
<div>&nbsp;</div>
<div>Ross</div>
<div>(as MPLS WG co-chair)</div>
<div>&nbsp;</div>
</span></font></div>
</div>
</div>
</body>
</html>

--_000_DB3PR03MB0780F8B46E2FB6CB778D231F9DA00DB3PR03MB0780eurp_--


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To: "adrian@olddog.co.uk" <adrian@olddog.co.uk>, "lizho.jin@gmail.com" <lizho.jin@gmail.com>, "'loa'" <loa@pi.nu>, "'mpls'" <mpls@ietf.org>, "'mpls-chairs'" <mpls-chairs@tools.ietf.org>, "'draft-ietf-mpls-lsp-ping-relay-reply'" <draft-ietf-mpls-lsp-ping-relay-reply@tools.ietf.org>, "'db3546'" <db3546@att.com>, Thomas Nadeau <tnadeau@lucidvision.com>
Thread-Topic: [mpls] MPLS working group last call on draft-ietf-mpls-lsp-ping-relay-reply
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Subject: Re: [mpls] MPLS working group last call on draft-ietf-mpls-lsp-ping-relay-reply
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Lizhong -

If there's any text left from the original draft, then it belongs to
either me or Tom.  I hereby surrender my rights.

Tom?

George

On 6/17/15 2:28 PM, "Adrian Farrel" <adrian@olddog.co.uk> wrote:

>Lizhong,
>
>Apologies, I fumbled your response.
>
>I snipped out the stuff we agree on.
>
>> Thank you for the review. Please see my reply inline below. Correct me
>> if other authors have different opinion.
>>
>> I will update the draft after the end of last call.
>
>>> Just being a good citizen and reviewing this I-D during WG last call.
>>> I didn't have much time so I only found a number of nits most of which
>>> are probably not significant.
>>> ---
>>>=20
>>> idnits notes the presence of a pre-RFC5378 disclaimer. Do you really
>>> need that?
>>> [Lizhong] this may need the answer from chairs and AD. We only follow
>>> the rules.
>
>If you are following the rules, that's fine. I think the rules are that
>you only
>need to include the disclaimer if text included in the document was
>written
>before the date of RFC 5378 and if at least one of the authors of the
>text has
>not given up their copyright as described in that RFC.
>
>[snip]
>
>>> Section 4.1
>>>=20
>>>   The source UDP port field MUST be set
>>>   to the source UDP port.
>>>=20
>>> There is no "source UDP port" field. Perhaps the "Initiator Source
>>>Port"
>>> field?
>>>=20
>>> But also, this text is quite confusing. The text in 3.2 is much
>>>clearer.
>> [Lizhong] yes, should be:
>> The source UDP port field MUST be set to the initiator source port.
>
>Hmmm, I think...
>
>"The Initiator Source Port field MUST be set to the source UDP port."
>=20
>[snip]
>=20
>> [Lizhong] traceroute is not mandatory before ping. If operator has
>>knowledge=20
>> of the relay nodes, the initiator could directly send ping with Relay
>>Node=20
>> Address Stack TLV containing the already known relay nodes.
>
>That would make a valuable addition to 4.1, as well.
>
>[snip]
>
>>> I tried to work out how things would pan out if two ASes on the path
>>> used the same address space within their AS. Would an address appear in
>>> the stack and seem to be routable when it is really an address in the
>>> other AS?
>> [Lizhong] we have an example in section 5. And address of P1 and P2
>>could be=20
>> same. In that case, ASBR1 must adds its interface address facing ASBR2
>>with=20
>> the K bit set. Then relay reply will not be miss-routed.
>
>Ah, I get it.
>But this relies on ASBT1 setting the K bit.
>So I suspect this needs to not be a special case: you need to require
>that the
>domain boundary always sets the K bit.
>=20
>[snip]
>=20
>>> The third case in 4.5 is when the receiver does not understand the TLV
>>> and ignores it. In this case it will send an Echo Reply without itself
>>> including the TLV.
>> [Lizhong] the receiver is unable to send the Echo Reply, because it does
>> know the destination IP address and UDP port number. So if the receiver
>> could not understand the TLV, then the relay message will be dropped.
>
>Section 4.5 of 4379 says:
>
>   The destination IP address and UDP port are copied from the
>   source IP address and UDP port of the echo request.
>
>That is what the legacy receiver will attempt to do. It doesn't matter
>whether
>the optional Relay Node Address Stack TLV is in the echo request message
>or not,
>the legacy node will follow 4379. So it *will* be able to respond.
>
>>> Section 6 should note that the new TLV provides a way for Echo Reply
>>> messages to be diverted so that information can be collected. For
>>> example, if a stack entry can be inserted, the Echo Reply messages can
>>> be caused to transit another AS unrelated to the LSP under test. Since
>>> the Echo Reply reveals path information about the LSP, this is a
>>> valuable attack.  Having said that, you can say how this TLV is
>>> protected in the Echo Reply message.
>>
>> [Lizhong] Do you mean the new TLV could be used to collect path
>>information
>> unrelated to the LSP under test? This is not true. Only the node along
>>the
>LSP=20
>> will add path information into the new TLV. The relay node in the new
>>TLV
>> will only relay the Echo Reply to the initiator, and will not add
>>information
>to
>> the new TLV.
>
>I think you misunderstand how security attacks might work. Suppose I am
>able to
>do one of two things:
>1. Modify the control plane code on a router that adds or processes a
>    Relay Node Address Stack TLV so that it adds a bogus entry to the
>     TLV. The prospect of modifications to control plane code is generally
>     considered to be so disastrous that it is just noted without any
>     further precautions (after all, if you can get at the control plane
>     code, you can make the routers do anything).
>2. Intercept and modify a packet in transit. This is the main risk I am
>    talking about.
>
>Cheers,
>Adrian
>
>_______________________________________________
>mpls mailing list
>mpls@ietf.org
>https://www.ietf.org/mailman/listinfo/mpls


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From: "George Swallow (swallow)" <swallow@cisco.com>
To: "adrian@olddog.co.uk" <adrian@olddog.co.uk>, "lizho.jin@gmail.com" <lizho.jin@gmail.com>, "'loa'" <loa@pi.nu>, "'mpls'" <mpls@ietf.org>, "'mpls-chairs'" <mpls-chairs@tools.ietf.org>, "'draft-ietf-mpls-lsp-ping-relay-reply'" <draft-ietf-mpls-lsp-ping-relay-reply@tools.ietf.org>, "'db3546'" <db3546@att.com>
Thread-Topic: [mpls] MPLS working group last call on draft-ietf-mpls-lsp-ping-relay-reply
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Lizhong, Adrian -=20

Inline -

On 6/17/15 2:28 PM, "Adrian Farrel" <adrian@olddog.co.uk> wrote:

>Lizhong,
>
>Apologies, I fumbled your response.
>
>I snipped out the stuff we agree on.
>
>> Thank you for the review. Please see my reply inline below. Correct me
>> if other authors have different opinion.
>>
>> I will update the draft after the end of last call.
>
>>> Just being a good citizen and reviewing this I-D during WG last call.
>>> I didn't have much time so I only found a number of nits most of which
>>> are probably not significant.
>>> ---
>>>=20
>>> idnits notes the presence of a pre-RFC5378 disclaimer. Do you really
>>> need that?
>>> [Lizhong] this may need the answer from chairs and AD. We only follow
>>> the rules.
>
>If you are following the rules, that's fine. I think the rules are that
>you only
>need to include the disclaimer if text included in the document was
>written
>before the date of RFC 5378 and if at least one of the authors of the
>text has
>not given up their copyright as described in that RFC.

GS> Sent mail giving up my rights.  Need to get Tom as well.
>
>>> Section 4.1
>>>=20
>>>   The source UDP port field MUST be set
>>>   to the source UDP port.
>>>=20
>>> There is no "source UDP port" field. Perhaps the "Initiator Source
>>>Port"
>>> field?
>>>=20
>>> But also, this text is quite confusing. The text in 3.2 is much
>>>clearer.
>> [Lizhong] yes, should be:
>> The source UDP port field MUST be set to the initiator source port.
>
>Hmmm, I think...
>
>"The Initiator Source Port field MUST be set to the source UDP port."

GS> Agree.
>=20
>> [Lizhong] traceroute is not mandatory before ping. If operator has
>>knowledge=20
>> of the relay nodes, the initiator could directly send ping with Relay
>>Node=20
>> Address Stack TLV containing the already known relay nodes.
>
>That would make a valuable addition to 4.1, as well.

GS> Indeed.  One of the applications here is to trace only so that you can
successfully ping.
>
>>> I tried to work out how things would pan out if two ASes on the path
>>> used the same address space within their AS. Would an address appear in
>>> the stack and seem to be routable when it is really an address in the
>>> other AS?
>> [Lizhong] we have an example in section 5. And address of P1 and P2
>>could be=20
>> same. In that case, ASBR1 must adds its interface address facing ASBR2
>>with=20
>> the K bit set. Then relay reply will not be miss-routed.
>
>Ah, I get it.
>But this relies on ASBT1 setting the K bit.
>So I suspect this needs to not be a special case: you need to require
>that the
>domain boundary always sets the K bit.

GS>  I made such a change awhile back.  It got shot down on the list.
There was push back due to the requirement for topological awareness
within the LSP Ping module.

Adrian - If you want to try pushing back on that, would you send a message
to the list on just this topic and see if we can convince folks.

>=20
>>> The third case in 4.5 is when the receiver does not understand the TLV
>>> and ignores it. In this case it will send an Echo Reply without itself
>>> including the TLV.
>> [Lizhong] the receiver is unable to send the Echo Reply, because it does
>> know the destination IP address and UDP port number. So if the receiver
>> could not understand the TLV, then the relay message will be dropped.
>
>Section 4.5 of 4379 says:
>
>   The destination IP address and UDP port are copied from the
>   source IP address and UDP port of the echo request.
>
>That is what the legacy receiver will attempt to do. It doesn't matter
>whether
>the optional Relay Node Address Stack TLV is in the echo request message
>or not,
>the legacy node will follow 4379. So it *will* be able to respond.

GS> Adrian - what you say about what the receiver will do is spot on.
However, there is no guarantee that it will be routable back to the source

>>> Section 6 should note that the new TLV provides a way for Echo Reply
>>> messages to be diverted so that information can be collected. For
>>> example, if a stack entry can be inserted, the Echo Reply messages can
>>> be caused to transit another AS unrelated to the LSP under test. Since
>>> the Echo Reply reveals path information about the LSP, this is a
>>> valuable attack.  Having said that, you can say how this TLV is
>>> protected in the Echo Reply message.
>>
>> [Lizhong] Do you mean the new TLV could be used to collect path
>>information
>> unrelated to the LSP under test? This is not true. Only the node along
>>the
>LSP=20
>> will add path information into the new TLV. The relay node in the new
>>TLV
>> will only relay the Echo Reply to the initiator, and will not add
>>information
>to
>> the new TLV.
>
>I think you misunderstand how security attacks might work. Suppose I am
>able to
>do one of two things:
>1. Modify the control plane code on a router that adds or processes a
>    Relay Node Address Stack TLV so that it adds a bogus entry to the
>     TLV. The prospect of modifications to control plane code is generally
>     considered to be so disastrous that it is just noted without any
>     further precautions (after all, if you can get at the control plane
>     code, you can make the routers do anything).
>2. Intercept and modify a packet in transit. This is the main risk I am
>    talking about.

GS> This is a good thing to include.

Thanks for the review.

George
>
>Cheers,
>Adrian
>
>_______________________________________________
>mpls mailing list
>mpls@ietf.org
>https://www.ietf.org/mailman/listinfo/mpls


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Thread-Topic: [mpls] Working Group Last Call for draft-ietf-bfd-rfc5884-clarifications
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Jeff,

Late reply =E2=80=94 I support advancing this document as it provides =
useful clarifications for RFC 5884.

Thanks,

=E2=80=94 Carlos.

> On May 4, 2015, at 3:58 PM, Jeffrey Haas <jhaas@pfrc.org> wrote:
>=20
> The BFD mailing list has been quiet since shortly after IETF 92.  We =
have a
> number of documents that seem stable and ready to advance.
>=20
> This email begins a two week Working Group Last Call for
> draft-ietf-bfd-rfc5884-clarifications-01, Clarifications to RFC 5884.
>=20
> This last call will end on May 15.
>=20
> Simultaneously, the authors of this draft should state to the mailing =
list
> whether there is any IPR associated with this draft or not.
>=20
> This WGLC is also being cc'd to mpls@ietf to permit additional =
commentary.
>=20
> -- Jeff and Nobo
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls


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From nobody Wed Jun 24 01:32:52 2015
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Date: Wed, 24 Jun 2015 10:32:42 +0200
From: Loa Andersson <loa@pi.nu>
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To: "George Swallow (swallow)" <swallow@cisco.com>,  "adrian@olddog.co.uk" <adrian@olddog.co.uk>, "lizho.jin@gmail.com" <lizho.jin@gmail.com>, 'mpls' <mpls@ietf.org>,  'mpls-chairs' <mpls-chairs@tools.ietf.org>, 'draft-ietf-mpls-lsp-ping-relay-reply' <draft-ietf-mpls-lsp-ping-relay-reply@tools.ietf.org>,  'db3546' <db3546@att.com>, Thomas Nadeau <tnadeau@lucidvision.com>
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Subject: Re: [mpls] MPLS working group last call on draft-ietf-mpls-lsp-ping-relay-reply
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George,

I sympathize with this, but as I recall it the current document is the
result of a merger between two earlier drafts:

draft-ietf-mpls-interas-lspping (first version posted  March 2007) and
that one goes back to draft-nadeau-mpls-interas-lspping (first version
posted July 2005).
and
draft-zj-mpls-lsp-ping-reply-relay (first version posted October 2011)

RFC 5378 was published Oct 2008, to be on the safe side any work that
pre-dates RFC 5378 should have the "pre-RFC5378 disclaimer". So draft-zj
is in the clear.

However, since both draft-ietf-mpls-interas-lspping and
draft-nadeau-mpls-interas-lspping predates RFC 5378, we need the
pre-RFC5378 disclaimer unless both authors of the two draft grant their
rights to the IETF trust. My straw man advice would be to try to remove
the pre-RFC5378 disclaimer based on statements from both authors.

George does so in the mail below.

Tom are you willing to do so also?

/Loa


On 2015-06-23 17:30, George Swallow (swallow) wrote:
> Lizhong -
>
> If there's any text left from the original draft, then it belongs to
> either me or Tom.  I hereby surrender my rights.
>
> Tom?
>
> George
>
> On 6/17/15 2:28 PM, "Adrian Farrel" <adrian@olddog.co.uk> wrote:
>
>> Lizhong,
>>
>> Apologies, I fumbled your response.
>>
>> I snipped out the stuff we agree on.
>>
>>> Thank you for the review. Please see my reply inline below. Correct me
>>> if other authors have different opinion.
>>>
>>> I will update the draft after the end of last call.
>>
>>>> Just being a good citizen and reviewing this I-D during WG last call.
>>>> I didn't have much time so I only found a number of nits most of which
>>>> are probably not significant.
>>>> ---
>>>>
>>>> idnits notes the presence of a pre-RFC5378 disclaimer. Do you really
>>>> need that?
>>>> [Lizhong] this may need the answer from chairs and AD. We only follow
>>>> the rules.
>>
>> If you are following the rules, that's fine. I think the rules are that
>> you only
>> need to include the disclaimer if text included in the document was
>> written
>> before the date of RFC 5378 and if at least one of the authors of the
>> text has
>> not given up their copyright as described in that RFC.
>>
>> [snip]
>>
>>>> Section 4.1
>>>>
>>>>    The source UDP port field MUST be set
>>>>    to the source UDP port.
>>>>
>>>> There is no "source UDP port" field. Perhaps the "Initiator Source
>>>> Port"
>>>> field?
>>>>
>>>> But also, this text is quite confusing. The text in 3.2 is much
>>>> clearer.
>>> [Lizhong] yes, should be:
>>> The source UDP port field MUST be set to the initiator source port.
>>
>> Hmmm, I think...
>>
>> "The Initiator Source Port field MUST be set to the source UDP port."
>>
>> [snip]
>>
>>> [Lizhong] traceroute is not mandatory before ping. If operator has
>>> knowledge
>>> of the relay nodes, the initiator could directly send ping with Relay
>>> Node
>>> Address Stack TLV containing the already known relay nodes.
>>
>> That would make a valuable addition to 4.1, as well.
>>
>> [snip]
>>
>>>> I tried to work out how things would pan out if two ASes on the path
>>>> used the same address space within their AS. Would an address appear in
>>>> the stack and seem to be routable when it is really an address in the
>>>> other AS?
>>> [Lizhong] we have an example in section 5. And address of P1 and P2
>>> could be
>>> same. In that case, ASBR1 must adds its interface address facing ASBR2
>>> with
>>> the K bit set. Then relay reply will not be miss-routed.
>>
>> Ah, I get it.
>> But this relies on ASBT1 setting the K bit.
>> So I suspect this needs to not be a special case: you need to require
>> that the
>> domain boundary always sets the K bit.
>>
>> [snip]
>>
>>>> The third case in 4.5 is when the receiver does not understand the TLV
>>>> and ignores it. In this case it will send an Echo Reply without itself
>>>> including the TLV.
>>> [Lizhong] the receiver is unable to send the Echo Reply, because it does
>>> know the destination IP address and UDP port number. So if the receiver
>>> could not understand the TLV, then the relay message will be dropped.
>>
>> Section 4.5 of 4379 says:
>>
>>    The destination IP address and UDP port are copied from the
>>    source IP address and UDP port of the echo request.
>>
>> That is what the legacy receiver will attempt to do. It doesn't matter
>> whether
>> the optional Relay Node Address Stack TLV is in the echo request message
>> or not,
>> the legacy node will follow 4379. So it *will* be able to respond.
>>
>>>> Section 6 should note that the new TLV provides a way for Echo Reply
>>>> messages to be diverted so that information can be collected. For
>>>> example, if a stack entry can be inserted, the Echo Reply messages can
>>>> be caused to transit another AS unrelated to the LSP under test. Since
>>>> the Echo Reply reveals path information about the LSP, this is a
>>>> valuable attack.  Having said that, you can say how this TLV is
>>>> protected in the Echo Reply message.
>>>
>>> [Lizhong] Do you mean the new TLV could be used to collect path
>>> information
>>> unrelated to the LSP under test? This is not true. Only the node along
>>> the
>> LSP
>>> will add path information into the new TLV. The relay node in the new
>>> TLV
>>> will only relay the Echo Reply to the initiator, and will not add
>>> information
>> to
>>> the new TLV.
>>
>> I think you misunderstand how security attacks might work. Suppose I am
>> able to
>> do one of two things:
>> 1. Modify the control plane code on a router that adds or processes a
>>     Relay Node Address Stack TLV so that it adds a bogus entry to the
>>      TLV. The prospect of modifications to control plane code is generally
>>      considered to be so disastrous that it is just noted without any
>>      further precautions (after all, if you can get at the control plane
>>      code, you can make the routers do anything).
>> 2. Intercept and modify a packet in transit. This is the main risk I am
>>     talking about.
>>
>> Cheers,
>> Adrian
>>
>> _______________________________________________
>> 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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> On Jun 24, 2015, at 4:32 AM, Loa Andersson <loa@pi.nu> wrote:
> 
> George,
> 
> I sympathize with this, but as I recall it the current document is the
> result of a merger between two earlier drafts:
> 
> draft-ietf-mpls-interas-lspping (first version posted  March 2007) and
> that one goes back to draft-nadeau-mpls-interas-lspping (first version
> posted July 2005).
> and
> draft-zj-mpls-lsp-ping-reply-relay (first version posted October 2011)
> 
> RFC 5378 was published Oct 2008, to be on the safe side any work that
> pre-dates RFC 5378 should have the "pre-RFC5378 disclaimer". So draft-zj
> is in the clear.
> 
> However, since both draft-ietf-mpls-interas-lspping and
> draft-nadeau-mpls-interas-lspping predates RFC 5378, we need the
> pre-RFC5378 disclaimer unless both authors of the two draft grant their
> rights to the IETF trust. My straw man advice would be to try to remove
> the pre-RFC5378 disclaimer based on statements from both authors.
> 
> George does so in the mail below.
> 
> Tom are you willing to do so also?

yes i agree.

> 
> /Loa
> 
> 
>> On 2015-06-23 17:30, George Swallow (swallow) wrote:
>> Lizhong -
>> 
>> If there's any text left from the original draft, then it belongs to
>> either me or Tom.  I hereby surrender my rights.
>> 
>> Tom?
>> 
>> George
>> 
>>> On 6/17/15 2:28 PM, "Adrian Farrel" <adrian@olddog.co.uk> wrote:
>>> 
>>> Lizhong,
>>> 
>>> Apologies, I fumbled your response.
>>> 
>>> I snipped out the stuff we agree on.
>>> 
>>>> Thank you for the review. Please see my reply inline below. Correct me
>>>> if other authors have different opinion.
>>>> 
>>>> I will update the draft after the end of last call.
>>> 
>>>>> Just being a good citizen and reviewing this I-D during WG last call.
>>>>> I didn't have much time so I only found a number of nits most of which
>>>>> are probably not significant.
>>>>> ---
>>>>> 
>>>>> idnits notes the presence of a pre-RFC5378 disclaimer. Do you really
>>>>> need that?
>>>>> [Lizhong] this may need the answer from chairs and AD. We only follow
>>>>> the rules.
>>> 
>>> If you are following the rules, that's fine. I think the rules are that
>>> you only
>>> need to include the disclaimer if text included in the document was
>>> written
>>> before the date of RFC 5378 and if at least one of the authors of the
>>> text has
>>> not given up their copyright as described in that RFC.
>>> 
>>> [snip]
>>> 
>>>>> Section 4.1
>>>>> 
>>>>>   The source UDP port field MUST be set
>>>>>   to the source UDP port.
>>>>> 
>>>>> There is no "source UDP port" field. Perhaps the "Initiator Source
>>>>> Port"
>>>>> field?
>>>>> 
>>>>> But also, this text is quite confusing. The text in 3.2 is much
>>>>> clearer.
>>>> [Lizhong] yes, should be:
>>>> The source UDP port field MUST be set to the initiator source port.
>>> 
>>> Hmmm, I think...
>>> 
>>> "The Initiator Source Port field MUST be set to the source UDP port."
>>> 
>>> [snip]
>>> 
>>>> [Lizhong] traceroute is not mandatory before ping. If operator has
>>>> knowledge
>>>> of the relay nodes, the initiator could directly send ping with Relay
>>>> Node
>>>> Address Stack TLV containing the already known relay nodes.
>>> 
>>> That would make a valuable addition to 4.1, as well.
>>> 
>>> [snip]
>>> 
>>>>> I tried to work out how things would pan out if two ASes on the path
>>>>> used the same address space within their AS. Would an address appear in
>>>>> the stack and seem to be routable when it is really an address in the
>>>>> other AS?
>>>> [Lizhong] we have an example in section 5. And address of P1 and P2
>>>> could be
>>>> same. In that case, ASBR1 must adds its interface address facing ASBR2
>>>> with
>>>> the K bit set. Then relay reply will not be miss-routed.
>>> 
>>> Ah, I get it.
>>> But this relies on ASBT1 setting the K bit.
>>> So I suspect this needs to not be a special case: you need to require
>>> that the
>>> domain boundary always sets the K bit.
>>> 
>>> [snip]
>>> 
>>>>> The third case in 4.5 is when the receiver does not understand the TLV
>>>>> and ignores it. In this case it will send an Echo Reply without itself
>>>>> including the TLV.
>>>> [Lizhong] the receiver is unable to send the Echo Reply, because it does
>>>> know the destination IP address and UDP port number. So if the receiver
>>>> could not understand the TLV, then the relay message will be dropped.
>>> 
>>> Section 4.5 of 4379 says:
>>> 
>>>   The destination IP address and UDP port are copied from the
>>>   source IP address and UDP port of the echo request.
>>> 
>>> That is what the legacy receiver will attempt to do. It doesn't matter
>>> whether
>>> the optional Relay Node Address Stack TLV is in the echo request message
>>> or not,
>>> the legacy node will follow 4379. So it *will* be able to respond.
>>> 
>>>>> Section 6 should note that the new TLV provides a way for Echo Reply
>>>>> messages to be diverted so that information can be collected. For
>>>>> example, if a stack entry can be inserted, the Echo Reply messages can
>>>>> be caused to transit another AS unrelated to the LSP under test. Since
>>>>> the Echo Reply reveals path information about the LSP, this is a
>>>>> valuable attack.  Having said that, you can say how this TLV is
>>>>> protected in the Echo Reply message.
>>>> 
>>>> [Lizhong] Do you mean the new TLV could be used to collect path
>>>> information
>>>> unrelated to the LSP under test? This is not true. Only the node along
>>>> the
>>> LSP
>>>> will add path information into the new TLV. The relay node in the new
>>>> TLV
>>>> will only relay the Echo Reply to the initiator, and will not add
>>>> information
>>> to
>>>> the new TLV.
>>> 
>>> I think you misunderstand how security attacks might work. Suppose I am
>>> able to
>>> do one of two things:
>>> 1. Modify the control plane code on a router that adds or processes a
>>>    Relay Node Address Stack TLV so that it adds a bogus entry to the
>>>     TLV. The prospect of modifications to control plane code is generally
>>>     considered to be so disastrous that it is just noted without any
>>>     further precautions (after all, if you can get at the control plane
>>>     code, you can make the routers do anything).
>>> 2. Intercept and modify a packet in transit. This is the main risk I am
>>>    talking about.
>>> 
>>> Cheers,
>>> Adrian
>>> 
>>> _______________________________________________
>>> 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 Wed Jun 24 08:37:59 2015
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: "draft-ietf-pals-mpls-tp-oam-config@tools.ietf.org" <draft-ietf-pals-mpls-tp-oam-config@tools.ietf.org>
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Subject: Re: [mpls] draft-ietf-pals-mpls-tp-oam-config
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Dear Authors,
I would like to bring your attention to the  Configuration of Proactive Ope=
rations, Administration, and Maintenance  (OAM) Functions for MPLS-based Tr=
ansport Networks using LSP Ping<https://tools.ietf.org/html/draft-ietf-mpls=
-lsp-ping-mpls-tp-oam-conf-09> that is ready for WG LC and will be presente=
d in Prague. The goal of the draft was to provide OAM Configuration to MPLS=
-TP PWs and, possibly, LSPs. Should note that OAM for MPLS-TP LSPs may be c=
onfigured based on RFC 7487 Configuration of Proactive Operations, Administ=
ration, and Maintenance (OAM) Functions  for MPLS-Based Transport Networks =
Using RSVP-TE. I think that there are lots of commonalities, especially fun=
ctionally, between all three documents and perhaps we can discuss that on t=
he list and/or in Prague.

                Regards,
                                Greg

--_000_7347100B5761DC41A166AC17F22DF1121B9E259Feusaamb103erics_
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<p class=3D"MsoNormal">Dear Authors,<o:p></o:p></p>
<p class=3D"MsoNormal">I would like to bring your attention to the &nbsp;<a=
 href=3D"https://tools.ietf.org/html/draft-ietf-mpls-lsp-ping-mpls-tp-oam-c=
onf-09">Configuration of Proactive Operations, Administration, and Maintena=
nce&nbsp; (OAM) Functions for MPLS-based Transport
 Networks using LSP Ping</a> that is ready for WG LC and will be presented =
in Prague. The goal of the draft was to provide OAM Configuration to MPLS-T=
P PWs and, possibly, LSPs. Should note that OAM for MPLS-TP LSPs may be con=
figured based on RFC 7487 Configuration
 of Proactive Operations, Administration, and Maintenance (OAM) Functions&n=
bsp; for MPLS-Based Transport Networks Using RSVP-TE. I think that there ar=
e lots of commonalities, especially functionally, between all three documen=
ts and perhaps we can discuss that on
 the list and/or in Prague.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Regards,<o:p></o:p></p>
<p class=3D"MsoNormal">&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; Greg<o:p></o:p>=
</p>
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--_000_7347100B5761DC41A166AC17F22DF1121B9E259Feusaamb103erics_--


From nobody Wed Jun 24 18:45:49 2015
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From: Mach Chen <mach.chen@huawei.com>
To: Gregory Mirsky <gregory.mirsky@ericsson.com>, "draft-ietf-pals-mpls-tp-oam-config@tools.ietf.org" <draft-ietf-pals-mpls-tp-oam-config@tools.ietf.org>
Thread-Topic: [Pals] draft-ietf-pals-mpls-tp-oam-config
Thread-Index: AdCuk7qCESQ/YrVxQTSobactqO9vTAAU5bzQ
Date: Thu, 25 Jun 2015 01:45:33 +0000
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Cc: "mpls@ietf.org" <mpls@ietf.org>, "draft-ietf-mpls-lsp-ping-mpls-tp-oam-conf@tools.ietf.org" <draft-ietf-mpls-lsp-ping-mpls-tp-oam-conf@tools.ietf.org>, "pals@ietf.org" <pals@ietf.org>
Subject: Re: [mpls] [Pals] draft-ietf-pals-mpls-tp-oam-config
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Hi Greg,

Indeed, and the drafts have common authors, I guess, to keep commonalities =
is the intention. I'd like to discuss with you about this either on the lis=
t /or in Prague.

We'd like more people to review the drafts, it would be very helpful to pro=
gress the drafts.

Thanks,
Mach

From: Pals [mailto:pals-bounces@ietf.org] On Behalf Of Gregory Mirsky
Sent: Wednesday, June 24, 2015 11:38 PM
To: draft-ietf-pals-mpls-tp-oam-config@tools.ietf.org
Cc: mpls@ietf.org; draft-ietf-mpls-lsp-ping-mpls-tp-oam-conf@tools.ietf.org=
; pals@ietf.org
Subject: Re: [Pals] draft-ietf-pals-mpls-tp-oam-config

Dear Authors,
I would like to bring your attention to the  Configuration of Proactive Ope=
rations, Administration, and Maintenance  (OAM) Functions for MPLS-based Tr=
ansport Networks using LSP Ping<https://tools.ietf.org/html/draft-ietf-mpls=
-lsp-ping-mpls-tp-oam-conf-09> that is ready for WG LC and will be presente=
d in Prague. The goal of the draft was to provide OAM Configuration to MPLS=
-TP PWs and, possibly, LSPs. Should note that OAM for MPLS-TP LSPs may be c=
onfigured based on RFC 7487 Configuration of Proactive Operations, Administ=
ration, and Maintenance (OAM) Functions  for MPLS-Based Transport Networks =
Using RSVP-TE. I think that there are lots of commonalities, especially fun=
ctionally, between all three documents and perhaps we can discuss that on t=
he list and/or in Prague.

                Regards,
                                Greg

--_000_F73A3CB31E8BE34FA1BBE3C8F0CB2AE28B47EF30SZXEMA510MBXchi_
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<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Hi Greg,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Indeed, and the drafts have common authors, I guess, to keep comm=
onalities is the intention. I&#8217;d like to discuss with you about this e=
ither on the list /or in Prague.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">We&#8217;d like more people to review the drafts, it would be ver=
y helpful to progress the drafts.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Mach<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<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;"> Pals [mailto:pals-bounces@ietf.org]
<b>On Behalf Of </b>Gregory Mirsky<br>
<b>Sent:</b> Wednesday, June 24, 2015 11:38 PM<br>
<b>To:</b> draft-ietf-pals-mpls-tp-oam-config@tools.ietf.org<br>
<b>Cc:</b> mpls@ietf.org; draft-ietf-mpls-lsp-ping-mpls-tp-oam-conf@tools.i=
etf.org; pals@ietf.org<br>
<b>Subject:</b> Re: [Pals] draft-ietf-pals-mpls-tp-oam-config<o:p></o:p></s=
pan></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">Dear Authors,<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I would like to bring your atte=
ntion to the &nbsp;<a href=3D"https://tools.ietf.org/html/draft-ietf-mpls-l=
sp-ping-mpls-tp-oam-conf-09">Configuration of Proactive Operations, Adminis=
tration, and Maintenance&nbsp; (OAM) Functions for
 MPLS-based Transport Networks using LSP Ping</a> that is ready for WG LC a=
nd will be presented in Prague. The goal of the draft was to provide OAM Co=
nfiguration to MPLS-TP PWs and, possibly, LSPs. Should note that OAM for MP=
LS-TP LSPs may be configured based
 on RFC 7487 Configuration of Proactive Operations, Administration, and Mai=
ntenance (OAM) Functions&nbsp; for MPLS-Based Transport Networks Using RSVP=
-TE. I think that there are lots of commonalities, especially functionally,=
 between all three documents and perhaps
 we can discuss that on the list and/or in Prague.<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">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Regards,<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&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; Greg<o:p></o:p></span></p>
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From nobody Wed Jun 24 23:04:48 2015
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Tarek,

If you can see this, please respond to the alias again.

/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 Wed Jun 24 23:22:02 2015
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Working Group,

This mail did go to the wrong mail address. Please ignore.

/Loa

On 2015-06-25 08:04, Loa Andersson wrote:
> Tarek,
>
> If you can see this, please respond to the alias again.
>
> /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 Thu Jun 25 00:47:36 2015
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To: thomas nadeau <tnadeau@lucidvision.com>,  "lizho.jin@gmail.com" <lizho.jin@gmail.com>
References: <D1AEF31A.3B607%swallow@cisco.com> <558A6B2A.9010000@pi.nu> <334FDAB8-48A3-40CC-A4A4-DB414F53EAD5@lucidvision.com>
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Subject: Re: [mpls] MPLS working group last call on draft-ietf-mpls-lsp-ping-relay-reply
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Lizhong,

It should be safe to remove the pre-RFC5378 disclaimer. I will address
the issue in the shepherds write-up.

/Loa

On 2015-06-24 12:02, thomas nadeau wrote:
>
>
>
>
>> On Jun 24, 2015, at 4:32 AM, Loa Andersson <loa@pi.nu> wrote:
>>
>> George,
>>
>> I sympathize with this, but as I recall it the current document is the
>> result of a merger between two earlier drafts:
>>
>> draft-ietf-mpls-interas-lspping (first version posted  March 2007) and
>> that one goes back to draft-nadeau-mpls-interas-lspping (first version
>> posted July 2005).
>> and
>> draft-zj-mpls-lsp-ping-reply-relay (first version posted October 2011)
>>
>> RFC 5378 was published Oct 2008, to be on the safe side any work that
>> pre-dates RFC 5378 should have the "pre-RFC5378 disclaimer". So draft-zj
>> is in the clear.
>>
>> However, since both draft-ietf-mpls-interas-lspping and
>> draft-nadeau-mpls-interas-lspping predates RFC 5378, we need the
>> pre-RFC5378 disclaimer unless both authors of the two draft grant their
>> rights to the IETF trust. My straw man advice would be to try to remove
>> the pre-RFC5378 disclaimer based on statements from both authors.
>>
>> George does so in the mail below.
>>
>> Tom are you willing to do so also?
>
> yes i agree.
>
>>
>> /Loa
>>
>>
>>> On 2015-06-23 17:30, George Swallow (swallow) wrote:
>>> Lizhong -
>>>
>>> If there's any text left from the original draft, then it belongs to
>>> either me or Tom.  I hereby surrender my rights.
>>>
>>> Tom?
>>>
>>> George
>>>
>>>> On 6/17/15 2:28 PM, "Adrian Farrel" <adrian@olddog.co.uk> wrote:
>>>>
>>>> Lizhong,
>>>>
>>>> Apologies, I fumbled your response.
>>>>
>>>> I snipped out the stuff we agree on.
>>>>
>>>>> Thank you for the review. Please see my reply inline below. Correct me
>>>>> if other authors have different opinion.
>>>>>
>>>>> I will update the draft after the end of last call.
>>>>
>>>>>> Just being a good citizen and reviewing this I-D during WG last call.
>>>>>> I didn't have much time so I only found a number of nits most of which
>>>>>> are probably not significant.
>>>>>> ---
>>>>>>
>>>>>> idnits notes the presence of a pre-RFC5378 disclaimer. Do you really
>>>>>> need that?
>>>>>> [Lizhong] this may need the answer from chairs and AD. We only follow
>>>>>> the rules.
>>>>
>>>> If you are following the rules, that's fine. I think the rules are that
>>>> you only
>>>> need to include the disclaimer if text included in the document was
>>>> written
>>>> before the date of RFC 5378 and if at least one of the authors of the
>>>> text has
>>>> not given up their copyright as described in that RFC.
>>>>
>>>> [snip]
>>>>
>>>>>> Section 4.1
>>>>>>
>>>>>>    The source UDP port field MUST be set
>>>>>>    to the source UDP port.
>>>>>>
>>>>>> There is no "source UDP port" field. Perhaps the "Initiator Source
>>>>>> Port"
>>>>>> field?
>>>>>>
>>>>>> But also, this text is quite confusing. The text in 3.2 is much
>>>>>> clearer.
>>>>> [Lizhong] yes, should be:
>>>>> The source UDP port field MUST be set to the initiator source port.
>>>>
>>>> Hmmm, I think...
>>>>
>>>> "The Initiator Source Port field MUST be set to the source UDP port."
>>>>
>>>> [snip]
>>>>
>>>>> [Lizhong] traceroute is not mandatory before ping. If operator has
>>>>> knowledge
>>>>> of the relay nodes, the initiator could directly send ping with Relay
>>>>> Node
>>>>> Address Stack TLV containing the already known relay nodes.
>>>>
>>>> That would make a valuable addition to 4.1, as well.
>>>>
>>>> [snip]
>>>>
>>>>>> I tried to work out how things would pan out if two ASes on the path
>>>>>> used the same address space within their AS. Would an address appear in
>>>>>> the stack and seem to be routable when it is really an address in the
>>>>>> other AS?
>>>>> [Lizhong] we have an example in section 5. And address of P1 and P2
>>>>> could be
>>>>> same. In that case, ASBR1 must adds its interface address facing ASBR2
>>>>> with
>>>>> the K bit set. Then relay reply will not be miss-routed.
>>>>
>>>> Ah, I get it.
>>>> But this relies on ASBT1 setting the K bit.
>>>> So I suspect this needs to not be a special case: you need to require
>>>> that the
>>>> domain boundary always sets the K bit.
>>>>
>>>> [snip]
>>>>
>>>>>> The third case in 4.5 is when the receiver does not understand the TLV
>>>>>> and ignores it. In this case it will send an Echo Reply without itself
>>>>>> including the TLV.
>>>>> [Lizhong] the receiver is unable to send the Echo Reply, because it does
>>>>> know the destination IP address and UDP port number. So if the receiver
>>>>> could not understand the TLV, then the relay message will be dropped.
>>>>
>>>> Section 4.5 of 4379 says:
>>>>
>>>>    The destination IP address and UDP port are copied from the
>>>>    source IP address and UDP port of the echo request.
>>>>
>>>> That is what the legacy receiver will attempt to do. It doesn't matter
>>>> whether
>>>> the optional Relay Node Address Stack TLV is in the echo request message
>>>> or not,
>>>> the legacy node will follow 4379. So it *will* be able to respond.
>>>>
>>>>>> Section 6 should note that the new TLV provides a way for Echo Reply
>>>>>> messages to be diverted so that information can be collected. For
>>>>>> example, if a stack entry can be inserted, the Echo Reply messages can
>>>>>> be caused to transit another AS unrelated to the LSP under test. Since
>>>>>> the Echo Reply reveals path information about the LSP, this is a
>>>>>> valuable attack.  Having said that, you can say how this TLV is
>>>>>> protected in the Echo Reply message.
>>>>>
>>>>> [Lizhong] Do you mean the new TLV could be used to collect path
>>>>> information
>>>>> unrelated to the LSP under test? This is not true. Only the node along
>>>>> the
>>>> LSP
>>>>> will add path information into the new TLV. The relay node in the new
>>>>> TLV
>>>>> will only relay the Echo Reply to the initiator, and will not add
>>>>> information
>>>> to
>>>>> the new TLV.
>>>>
>>>> I think you misunderstand how security attacks might work. Suppose I am
>>>> able to
>>>> do one of two things:
>>>> 1. Modify the control plane code on a router that adds or processes a
>>>>     Relay Node Address Stack TLV so that it adds a bogus entry to the
>>>>      TLV. The prospect of modifications to control plane code is generally
>>>>      considered to be so disastrous that it is just noted without any
>>>>      further precautions (after all, if you can get at the control plane
>>>>      code, you can make the routers do anything).
>>>> 2. Intercept and modify a packet in transit. This is the main risk I am
>>>>     talking about.
>>>>
>>>> Cheers,
>>>> Adrian
>>>>
>>>> _______________________________________________
>>>> 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

-- 


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: "Lizhong Jin" <lizho.jin@gmail.com>
To: "'Loa Andersson'" <loa@pi.nu>, "'thomas nadeau'" <tnadeau@lucidvision.com>
References: <D1AEF31A.3B607%swallow@cisco.com> <558A6B2A.9010000@pi.nu> <334FDAB8-48A3-40CC-A4A4-DB414F53EAD5@lucidvision.com> <558BB212.5040303@pi.nu>
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Subject: Re: [mpls] MPLS working group last call on draft-ietf-mpls-lsp-ping-relay-reply
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Thank you all for the help. We will update accordingly in the next =
version.

Regards
Lizhong

> -----Original Message-----
> From: Loa Andersson [mailto:loa@pi.nu]
> Sent: 2015=C4=EA6=D4=C225=C8=D5 15:48
> To: thomas nadeau; lizho.jin@gmail.com
> Cc: George Swallow (swallow); adrian@olddog.co.uk; mpls; mpls-chairs;
> draft-ietf-mpls-lsp-ping-relay-reply; db3546
> Subject: Re: [mpls] MPLS working group last call on
> draft-ietf-mpls-lsp-ping-relay-reply
>=20
> Lizhong,
>=20
> It should be safe to remove the pre-RFC5378 disclaimer. I will address =
the
issue
> in the shepherds write-up.
>=20
> /Loa
>=20
> On 2015-06-24 12:02, thomas nadeau wrote:
> >
> >
> >
> >
> >> On Jun 24, 2015, at 4:32 AM, Loa Andersson <loa@pi.nu> wrote:
> >>
> >> George,
> >>
> >> I sympathize with this, but as I recall it the current document is
> >> the result of a merger between two earlier drafts:
> >>
> >> draft-ietf-mpls-interas-lspping (first version posted  March 2007)
> >> and that one goes back to draft-nadeau-mpls-interas-lspping (first
> >> version posted July 2005).
> >> and
> >> draft-zj-mpls-lsp-ping-reply-relay (first version posted October
> >> 2011)
> >>
> >> RFC 5378 was published Oct 2008, to be on the safe side any work =
that
> >> pre-dates RFC 5378 should have the "pre-RFC5378 disclaimer". So
> >> draft-zj is in the clear.
> >>
> >> However, since both draft-ietf-mpls-interas-lspping and
> >> draft-nadeau-mpls-interas-lspping predates RFC 5378, we need the
> >> pre-RFC5378 disclaimer unless both authors of the two draft grant
> >> their rights to the IETF trust. My straw man advice would be to try
> >> to remove the pre-RFC5378 disclaimer based on statements from both
> authors.
> >>
> >> George does so in the mail below.
> >>
> >> Tom are you willing to do so also?
> >
> > yes i agree.
> >
> >>
> >> /Loa
> >>
> >>
> >>> On 2015-06-23 17:30, George Swallow (swallow) wrote:
> >>> Lizhong -
> >>>
> >>> If there's any text left from the original draft, then it belongs =
to
> >>> either me or Tom.  I hereby surrender my rights.
> >>>
> >>> Tom?
> >>>
> >>> George
> >>>
> >>>> On 6/17/15 2:28 PM, "Adrian Farrel" <adrian@olddog.co.uk> wrote:
> >>>>
> >>>> Lizhong,
> >>>>
> >>>> Apologies, I fumbled your response.
> >>>>
> >>>> I snipped out the stuff we agree on.
> >>>>
> >>>>> Thank you for the review. Please see my reply inline below.
> >>>>> Correct me if other authors have different opinion.
> >>>>>
> >>>>> I will update the draft after the end of last call.
> >>>>
> >>>>>> Just being a good citizen and reviewing this I-D during WG last
call.
> >>>>>> I didn't have much time so I only found a number of nits most =
of
> >>>>>> which are probably not significant.
> >>>>>> ---
> >>>>>>
> >>>>>> idnits notes the presence of a pre-RFC5378 disclaimer. Do you
> >>>>>> really need that?
> >>>>>> [Lizhong] this may need the answer from chairs and AD. We only
> >>>>>> follow the rules.
> >>>>
> >>>> If you are following the rules, that's fine. I think the rules =
are
> >>>> that you only need to include the disclaimer if text included in
> >>>> the document was written before the date of RFC 5378 and if at
> >>>> least one of the authors of the text has not given up their
> >>>> copyright as described in that RFC.
> >>>>
> >>>> [snip]
> >>>>
> >>>>>> Section 4.1
> >>>>>>
> >>>>>>    The source UDP port field MUST be set
> >>>>>>    to the source UDP port.
> >>>>>>
> >>>>>> There is no "source UDP port" field. Perhaps the "Initiator
> >>>>>> Source Port"
> >>>>>> field?
> >>>>>>
> >>>>>> But also, this text is quite confusing. The text in 3.2 is much
> >>>>>> clearer.
> >>>>> [Lizhong] yes, should be:
> >>>>> The source UDP port field MUST be set to the initiator source =
port.
> >>>>
> >>>> Hmmm, I think...
> >>>>
> >>>> "The Initiator Source Port field MUST be set to the source UDP =
port."
> >>>>
> >>>> [snip]
> >>>>
> >>>>> [Lizhong] traceroute is not mandatory before ping. If operator =
has
> >>>>> knowledge of the relay nodes, the initiator could directly send
> >>>>> ping with Relay Node Address Stack TLV containing the already
> >>>>> known relay nodes.
> >>>>
> >>>> That would make a valuable addition to 4.1, as well.
> >>>>
> >>>> [snip]
> >>>>
> >>>>>> I tried to work out how things would pan out if two ASes on the
> >>>>>> path used the same address space within their AS. Would an
> >>>>>> address appear in the stack and seem to be routable when it is
> >>>>>> really an address in the other AS?
> >>>>> [Lizhong] we have an example in section 5. And address of P1 and
> >>>>> P2 could be same. In that case, ASBR1 must adds its interface
> >>>>> address facing ASBR2 with the K bit set. Then relay reply will =
not
> >>>>> be miss-routed.
> >>>>
> >>>> Ah, I get it.
> >>>> But this relies on ASBT1 setting the K bit.
> >>>> So I suspect this needs to not be a special case: you need to
> >>>> require that the domain boundary always sets the K bit.
> >>>>
> >>>> [snip]
> >>>>
> >>>>>> The third case in 4.5 is when the receiver does not understand
> >>>>>> the TLV and ignores it. In this case it will send an Echo Reply
> >>>>>> without itself including the TLV.
> >>>>> [Lizhong] the receiver is unable to send the Echo Reply, because
> >>>>> it does know the destination IP address and UDP port number. So =
if
> >>>>> the receiver could not understand the TLV, then the relay =
message
will
> be dropped.
> >>>>
> >>>> Section 4.5 of 4379 says:
> >>>>
> >>>>    The destination IP address and UDP port are copied from the
> >>>>    source IP address and UDP port of the echo request.
> >>>>
> >>>> That is what the legacy receiver will attempt to do. It doesn't
> >>>> matter whether the optional Relay Node Address Stack TLV is in =
the
> >>>> echo request message or not, the legacy node will follow 4379. So
> >>>> it *will* be able to respond.
> >>>>
> >>>>>> Section 6 should note that the new TLV provides a way for Echo
> >>>>>> Reply messages to be diverted so that information can be
> >>>>>> collected. For example, if a stack entry can be inserted, the
> >>>>>> Echo Reply messages can be caused to transit another AS =
unrelated
> >>>>>> to the LSP under test. Since the Echo Reply reveals path
> >>>>>> information about the LSP, this is a valuable attack.  Having
> >>>>>> said that, you can say how this TLV is protected in the Echo =
Reply
> message.
> >>>>>
> >>>>> [Lizhong] Do you mean the new TLV could be used to collect path
> >>>>> information unrelated to the LSP under test? This is not true.
> >>>>> Only the node along the
> >>>> LSP
> >>>>> will add path information into the new TLV. The relay node in =
the
> >>>>> new TLV will only relay the Echo Reply to the initiator, and =
will
> >>>>> not add information
> >>>> to
> >>>>> the new TLV.
> >>>>
> >>>> I think you misunderstand how security attacks might work. =
Suppose
> >>>> I am able to do one of two things:
> >>>> 1. Modify the control plane code on a router that adds or =
processes a
> >>>>     Relay Node Address Stack TLV so that it adds a bogus entry to =
the
> >>>>      TLV. The prospect of modifications to control plane code is
> generally
> >>>>      considered to be so disastrous that it is just noted without =
any
> >>>>      further precautions (after all, if you can get at the =
control
plane
> >>>>      code, you can make the routers do anything).
> >>>> 2. Intercept and modify a packet in transit. This is the main =
risk I
am
> >>>>     talking about.
> >>>>
> >>>> Cheers,
> >>>> Adrian
> >>>>
> >>>> _______________________________________________
> >>>> 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
>=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


From nobody Thu Jun 25 04:55:04 2015
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Date: Thu, 25 Jun 2015 07:54:39 -0400
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Subject: [mpls] PALS and MPLS have swapped Thursday slots at IETF 93
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--047d7b5d978ffb50d10519564af1
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PALS and MPLS WGs:

Note that on the IETF 93 agenda
https://datatracker.ietf.org/meeting/93/agenda.html , MPLS will now meet at
15:20 and PALS at 17:40 on Thursday. This removes a conflict between MPLS
and I2RS, and gives more meeting time to the MPLS WG. PALS now conflicts
with I2RS, but this is a less serious conflict than MPLS and I2RS.

Cheers,
Andy

--047d7b5d978ffb50d10519564af1
Content-Type: text/html; charset=UTF-8
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<div dir=3D"ltr">PALS and MPLS WGs:<br><div><br></div><div>Note that on the=
 IETF 93 agenda=C2=A0<a href=3D"https://datatracker.ietf.org/meeting/93/age=
nda.html">https://datatracker.ietf.org/meeting/93/agenda.html</a> , MPLS wi=
ll now meet at 15:20 and PALS at 17:40 on Thursday. This removes a conflict=
 between MPLS and I2RS, and gives more meeting time to the MPLS WG. PALS no=
w conflicts with I2RS, but this is a less serious conflict than MPLS and I2=
RS.</div><div><br></div><div>Cheers,</div><div>Andy</div><div><br></div></d=
iv>

--047d7b5d978ffb50d10519564af1--


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From: "George Swallow (swallow)" <swallow@cisco.com>
To: "adrian@olddog.co.uk" <adrian@olddog.co.uk>, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: draft-vainshtein-mpls-gal-tc-ttl-handling-00.txt
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Subject: [mpls] draft-vainshtein-mpls-gal-tc-ttl-handling-00.txt
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Sasha, Adrian -

In the abstract this document claims to "clarify" RFC5586.  However it
actually modifies the behavior in two ways.

First in section 4.2.1.1, RFC5586 states:

  The TTL field of the GAL LSE MUST be set to at least 1.

This can equally be stated as "MUST NOT set the TTL to 0.  However this
document changes that to "SHOULD NOT".  I see absolutely no reason for
this change.

Second, as per 5586 a receiver that discarded a received GAL with TTL=3D0
was not out of compliance with that rfc.  Now you say that a receiver that
a receiver "that examines an LSE that contains the GAL MUST ignore the
value of the TTL field".

So a piece of hardware, say an ASIC, was designed years ago to discard
packets with a TTL of 0 in the top label is now out of compliance whereas
in RFC5586 the fault in this situation would lie clearly with the sender.

Now suppose further that our ASIC is also programmed to put packets with a
TTL of 1 in the top label on the slow path.  Here the ASIC is not ignoring
the TTL value - it is making a decision based on it.  It is, however,
still enabling a CP or RP to process the GAL.  This, of course, may not be
optimal, but it should not be illegal.
=20
So how about we say that "the LER that originates the G-ACh packet SHOULD
   NOT set this value to 1 and MUST NOT set this value to 0."

For the receiver, I think it suffices to say "SHOULD ignore the value of
the TTL field".  But if you want to work a MUST into the language - its
scope should not include the value 0 and the language should not be about
"examining".

Something like "MUST not discard =8A based on a TTL value of 1 or more."

George






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To: Gregory Mirsky <gregory.mirsky@ericsson.com>, "Osborne, Eric" <eric.osborne@level3.com>, "Yaakov Stein (yaakov_s@rad.com)" <yaakov_s@rad.com>, Lucy yong <lucy.yong@huawei.com>, "draft-mirsky-mpls-residence-time@tools.ietf.org" <draft-mirsky-mpls-residence-time@tools.ietf.org>, "mpls-chairs@tools.ietf.org" <mpls-chairs@tools.ietf.org>, Markus Jork <mjork@juniper.net>
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Subject: Re: [mpls] MPLS_RT review of draft-mirsky-mpls-residence-time-06.txt
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Dear Reviewers,
would greatly appreciate your comments on proposed changes. Please let us k=
now whether  your comments, suggestions been addressed in -07 version of th=
e draft.

	Regards,
		Greg

-----Original Message-----
From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Gregory Mirsky
Sent: Thursday, June 18, 2015 12:27 PM
To: Osborne, Eric; Yaakov Stein (yaakov_s@rad.com); Lucy yong; draft-mirsky=
-mpls-residence-time@tools.ietf.org; mpls-chairs@tools.ietf.org; Markus Jor=
k
Cc: mpls@ietf.org
Subject: Re: [mpls] MPLS_RT review of draft-mirsky-mpls-residence-time-06.t=
xt

Hi Lucy, Markus, Eric, and Yaakov,
many thanks for your kind consideration and thoughtful comments. Attached a=
re new version of the draft and diff that highlights changes proposed. Grea=
tly appreciate your review and hope that you find your comments being addre=
ssed, mostly if not completely.

	Regards,
		Greg


-----Original Message-----
From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Osborne, Eric
Sent: Tuesday, May 26, 2015 6:45 AM
To: Lucy yong; draft-mirsky-mpls-residence-time@tools.ietf.org; mpls-chairs=
@tools.ietf.org
Cc: mpls@ietf.org
Subject: Re: [mpls] MPLS_RT review of draft-mirsky-mpls-residence-time-06.t=
xt

I finally had some time to read this draft as well.  I agree with Lucy's ge=
neral comments - this doc seems to achieve the goal it sets out.  Is it use=
ful?  Not to me.  It seems like it's maybe for mobile networks?  I'm not an=
 expert in the matter of timing so this review assumes that the actual timi=
ng procedures work.  My comments below are about how RTM fits into the larg=
er picture.


General question: does RTM work over LAGs?  They're a flavor of ECMP in som=
e respects.  If not, that needs to be spelled out somewhere.

It might be worth spending a few lines in the introduction talking about wh=
o might want to use this and what sort of restrictions it places on a netwo=
rk design.



Specific comments:

Section 4 talks about LDP and ECMP and the problems it causes.  It suggests=
 that one solution is to disable ECMP used for RTM LSPs.  This seems like i=
t would only make the problem worse; the more you separate the OAM path fro=
m the actual data path, the less useful your measurements are.  You may be =
far better off just saying "don't do RTM with MP2P LSPs".

Section 4.1, "LSAs sent from an interface".  This doesn't line up with how =
link-state protocols work.  There should be no property of an LSA dependant=
 upon the interface that it's sent out (OK, modulo type 9 opaques and stuff=
).  I think this really wants to say "LSAs sent from a router which describ=
e a particular interface". =20


Section 4.5 could use a review from an ISIS expert.  I scanned the GENINFO =
TLV and it's not clear to me how RTM will associate a capability with a spe=
cific interface between peers.  What if I have several interfaces between A=
-B and only some of them support RTM?  I'm not saying this isn't covered, b=
ut that it's not clear to me as a casual reader of Section 4.5 and GENINFO.

Section 4.6, "egress LSR's egress interface".  So if I have


A---B---C---D---E---F

a TE LSP B->E and IP nodes A and F, is section 4.6 really referring to the =
E->F interface?


What if I have a TE LSP A->F?  Where's the 'egress LSR's egress interface'?
What if I have a TE LSP A->C, C->E and E->F?  Or LDP A->C, TE C->E, LDP E->=
F?




eric



> -----Original Message-----
> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Lucy yong
> Sent: Wednesday, May 06, 2015 6:39 PM
> To: draft-mirsky-mpls-residence-time@tools.ietf.org; mpls-=20
> chairs@tools.ietf.org
> Cc: mpls@ietf.org
> Subject: Re: [mpls] MPLS_RT review of
> draft-mirsky-mpls-residence-time- 06.txt
>=20
> Hi All,
>=20
> I reviewed draft-mirsky-mpls-residence-time as the member of MPLS=20
> Review Team and have the following comments:
>=20
> is the document coherent?
>=20
> Yes. It specifies how MPLS supports residence time measurement.
>=20
> is it useful (ie, is it likely to be actually useful in operational netwo=
rks)?
>=20
> The document claims that such measurement can improve the accuracy of=20
> clock synchronization across the network. I am not an operator and=20
> author and not sure how useful this feature provides compared to the=20
> complexity adding to.
>=20
> is the document technically sound?
> Yes. The draft provides a detail solution in control plane and data=20
> plane to achieve this purpose.
>=20
> is the document ready to be considered for WG adoption?
> Yes. The document states the problem clearly and provides a solution=20
> to address this problem.
>=20
> IMHO:  after adopting it as the WG draft, the WG should further=20
> evaluate if control plane and data plane solution can be simplified.
> The areas may be
> considered:
> 1) Do we have to use IGP to announce node RTM capability? Can RSVP-TE=20
> resolve the issue by itself?
> 2) Will possible to enhance RRO to serve RSO purpose instead of=20
> carrying both RRO and RSO in the message?
> 3) Since this feature is designed for the LSP that is used for clock=20
> synchronization, such LSPs are not majority, so it should be option in=20
> LSP setup. Make that very clear.
> 4) two-step clock mode is quite complex. The description in Section 7=20
> is not clear to me why this mode is necessary.
>=20
> Regards,
> Lucy
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls

_______________________________________________
mpls mailing list
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From nobody Sat Jun 27 15:26:56 2015
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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: "draft-vainshtein-mpls-gal-tc-ttl-handling@tools.ietf.org" <draft-vainshtein-mpls-gal-tc-ttl-handling@tools.ietf.org>, "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>
Thread-Topic: MPLS-RT review of draft-vainshtein-mpls-gal-tc-ttl-handling-01
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Date: Sat, 27 Jun 2015 22:26:51 +0000
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Subject: [mpls] MPLS-RT review of draft-vainshtein-mpls-gal-tc-ttl-handling-01
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Hi,

I=E2=80=99ve been selected as MPLS-RT reviewer for =
draft-vainshtein-mpls-gal-tc-ttl-handling-01. Please find my review =
below.

I believe this is a useful, coherent, and technically sound document. =
However, it does have issues that require attention and consideration.

Technical Issues:

3.1.  New Procedures for Handling the TC Field in an LSE That Contains
      the GAL

   Setting the value of the TC field in an LSE that contains the GAL is
   done by the LER that originates the G-ACh packet and is a matter of
   local policy for that LER.  It is RECOMMENDED that implementations
   set the TC field of an LSE that contains the GAL to all zero (0b000).

CMP: If it is a local policy, why the RECOMMENDED language? Why not =
state a default policy, such that lacking any other it is set to 0, but =
RECOMMENDED sounds too strong. In fact, it has no interop =
considerations, does it?

CMP: A nit, is 0b000 the same as 000b? Not sure the notation.

   The LER that inspects an LSE that contains the GAL MUST ignore the
   value of the TC field.

CMP: Similarly, this document concerns itself with maximizing =
interoperability. Why this strongest =E2=80=9CMUST=E2=80=9D? Setting =
ourselves up for updating this when there is a use?

3.2.  New Procedures for Handling the TTL Field in an LSE Containing GAL

CMP: I agree with this comment: =
http://www.ietf.org/mail-archive/web/mpls/current/msg14300.html =
<http://www.ietf.org/mail-archive/web/mpls/current/msg14300.html>

Nits:

 Handling the TC and TTL fields in a Label Stack Entry when the Generic
                  Associated Channel Label is Present

CMP: When I read this, I was not sure if the GAL was present in any LSE. =
This is likely just me, but it would be best to disambiguate potential =
misreads (like mine) with "Label Stack Entry (LSE) containing the GAL=E2=80=
=9D (i.e., otherwise present where?)

I hope these are useful =E2=80=94 thanks!

=E2=80=94 Carlos.


--Apple-Mail=_B5F1E650-B3F4-4F3F-9F1A-CDAADDD508C6
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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,<div class=3D""><br class=3D""></div><div class=3D"">I=E2=80=
=99ve been&nbsp;selected as MPLS-RT reviewer for =
draft-vainshtein-mpls-gal-tc-ttl-handling-01. Please find my review =
below.</div><div class=3D""><br class=3D""></div><div class=3D"">I =
believe this is a useful, coherent, and technically sound document. =
However, it does have issues that require attention and =
consideration.</div><div class=3D""><br class=3D""></div><div =
class=3D"">Technical Issues:</div><div class=3D""><br =
class=3D""></div><div class=3D"">3.1. &nbsp;New Procedures for Handling =
the TC Field in an LSE That Contains<br class=3D"">&nbsp; &nbsp; &nbsp; =
the GAL</div><div class=3D""><br class=3D""></div><div class=3D""><div =
class=3D"">&nbsp; &nbsp;Setting the value of the TC field in an LSE that =
contains the GAL is</div><div class=3D"">&nbsp; &nbsp;done by the LER =
that originates the G-ACh packet and is a matter of</div><div =
class=3D"">&nbsp; &nbsp;local policy for that LER. &nbsp;It is =
RECOMMENDED that implementations</div><div class=3D"">&nbsp; &nbsp;set =
the TC field of an LSE that contains the GAL to all zero =
(0b000).</div><div class=3D""><br class=3D""></div><div class=3D"">CMP: =
If it is a local policy, why the RECOMMENDED language? Why not state a =
default policy, such that lacking any other it is set to 0, but =
RECOMMENDED sounds too strong. In fact, it has no interop =
considerations, does it?</div><div class=3D""><br class=3D""></div><div =
class=3D"">CMP: A nit, is 0b000 the same as 000b? Not sure the =
notation.</div><div class=3D""><br class=3D""></div><div class=3D"">&nbsp;=
 &nbsp;The LER that inspects an LSE that contains the GAL MUST ignore =
the</div><div class=3D"">&nbsp; &nbsp;value of the TC =
field.</div></div><div class=3D""><br class=3D""></div><div =
class=3D"">CMP: Similarly, this document concerns itself with maximizing =
interoperability. Why this strongest =E2=80=9CMUST=E2=80=9D? Setting =
ourselves up for updating this when there is a use?</div><div =
class=3D""><br class=3D""></div><div class=3D"">3.2. &nbsp;New =
Procedures for Handling the TTL Field in an LSE Containing GAL</div><div =
class=3D""><br class=3D""></div><div class=3D"">CMP: I agree with this =
comment:&nbsp;<a =
href=3D"http://www.ietf.org/mail-archive/web/mpls/current/msg14300.html" =
class=3D"">http://www.ietf.org/mail-archive/web/mpls/current/msg14300.html=
</a></div><div class=3D""><br class=3D""></div><div =
class=3D"">Nits:</div><div class=3D""><br class=3D""></div><div =
class=3D"">&nbsp;Handling the TC and TTL fields in a Label Stack Entry =
when the Generic<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; Associated Channel Label is Present</div><div =
class=3D""><br class=3D""></div><div class=3D"">CMP: When I read this, I =
was not sure if the GAL was present in any LSE. This is likely just me, =
but it would be best to disambiguate potential misreads (like mine) with =
"Label Stack Entry (LSE) containing the GAL=E2=80=9D (i.e., otherwise =
present where?)</div><div class=3D""><br class=3D""></div><div =
class=3D"">I hope these are useful =E2=80=94 thanks!</div><div =
class=3D""><br class=3D""></div><div class=3D"">=E2=80=94 =
Carlos.</div><div class=3D""><br class=3D""></div></body></html>=

--Apple-Mail=_B5F1E650-B3F4-4F3F-9F1A-CDAADDD508C6--

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From nobody Sun Jun 28 02:59:38 2015
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Cc: draft-ietf-mpls-self-ping@tools.ietf.org, "mpls-chairs@tools.ietf.org" <mpls-chairs@tools.ietf.org>
Subject: [mpls] MPLS working group last call on draft-ietf-mpls-self-ping
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Working Group,

This is to initiate a two week working group last call on
draft-ietf-mpls-self-ping.

Please send your comments to the mpls wg mailing list (mpls@ietf.org).

An IPR poll has been started in parallel to the wglc.


This working group last call ends July 13, 2015.


/Loa
for the MPLS wg chairs

-- 


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: [mpls] IPR Poll on draft-ietf-mpls-self-ping
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Working Group,

We have started a working group adoption poll on draft-ietf-mpls-self-ping

We will do an IPR poll in parallel to the adoption poll.

This mail starts the IPR poll.

Are you aware of any IPR that applies to draft-ietf-mpls-self-ping?

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

There were one IPR disclosure filed against thsi document when it still
were an individual document, it has not been re-filed against the
working group 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.


/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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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'Carlos Pignataro \(cpignata\)'" <cpignata@cisco.com>, <draft-vainshtein-mpls-gal-tc-ttl-handling@tools.ietf.org>, <mpls-chairs@ietf.org>
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Subject: Re: [mpls] MPLS-RT review of draft-vainshtein-mpls-gal-tc-ttl-handling-01
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Hi Carlos

Thanks for the time and effort.

> I=E2=80=99ve been selected as MPLS-RT reviewer for =
draft-vainshtein-mpls-gal-tc-
> ttl-handling-01. Please find my review below.
>
> I believe this is a useful, coherent, and technically sound document.=20
> However, it does have issues that require attention and consideration.

I'll start discussing these issues here, but hopefully these are not =
points (given your summary) that need delay adoption.

> Technical Issues:
>
> 3.1.  New Procedures for Handling the TC Field in an LSE That Contains
>      the GAL
>
>  Setting the value of the TC field in an LSE that contains the GAL is
>  done by the LER that originates the G-ACh packet and is a matter of
>  local policy for that LER.  It is RECOMMENDED that implementations
>  set the TC field of an LSE that contains the GAL to all zero (0b000).
>
> CMP: If it is a local policy, why the RECOMMENDED language? Why not =
state a
> default policy, such that lacking any other it is set to 0, but =
RECOMMENDED=20
> sounds too strong. In fact, it has no interop considerations, does it?

2119 "RECOMMENDED" is the equivalent of "SHOULD". That means that =
implementations "MAY" vary the behavior. In this case, the variance is =
local policy. I think that "RECOMMENDED" means exactly what you suggest, =
viz. "If you don't have a good reason to do otherwise, your default =
behavior is (should be) to set to zero."

I'm happy to be guided by WG opinion on this.=20

I suppose a return question to you is "What damage will it do to make =
this recommendation"?

> CMP: A nit, is 0b000 the same as 000b? Not sure the notation.

I looked at...
    https://en.wikipedia.org/wiki/Binary_number#Representation
and found a number of options including:
      0b100101 (a prefix indicating binary format, common in programming =
languages)

>  The LER that inspects an LSE that contains the GAL MUST ignore the
>  value of the TC field.
>
> CMP: Similarly, this document concerns itself with maximizing =
interoperability.
> Why this strongest =E2=80=9CMUST=E2=80=9D? Setting ourselves up for =
updating this when there
> is a use?

I think there is a common misunderstanding of "MUST" in this sort of =
case.
Consider that when a specific meaning is assigned to the TC in the GAL =
LSE, this will be done in a new document that will update this document.
It will be really, really important that when new meanings of this TC =
are defined, they pass safely through legacy nodes.
It's also pretty important that this TC field is not used as a covert =
channel by implementations that might fail to interoperate correctly.

So, there is an alternative to "MUST ignore on receipt" and that is =
"MUST set to zero on transmission".
I'd be happy to go either way.

> 3.2.  New Procedures for Handling the TTL Field in an LSE Containing =
GAL
>
> CMP: I agree with this comment:
> http://www.ietf.org/mail-archive/web/mpls/current/msg14300.html

I'll respond to George in his thread.

> Nits:
>
> Handling the TC and TTL fields in a Label Stack Entry when the Generic
>                  Associated Channel Label is Present
>
> CMP: When I read this, I was not sure if the GAL was present in any =
LSE.=20
> This is likely just me, but it would be best to disambiguate potential
>  misreads (like mine) with "Label Stack Entry (LSE) containing the =
GAL=E2=80=9D
> (i.e., otherwise present where?)

Yup.

> I hope these are useful =E2=80=94 thanks!

Thanks again.

Adrian


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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: Adrian Farrel <adrian@olddog.co.uk>
Thread-Topic: MPLS-RT review of draft-vainshtein-mpls-gal-tc-ttl-handling-01
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Subject: Re: [mpls] MPLS-RT review of draft-vainshtein-mpls-gal-tc-ttl-handling-01
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Hi Adrian,

> On Jun 28, 2015, at 1:02 PM, Adrian Farrel <adrian@olddog.co.uk> =
wrote:
>=20
> Hi Carlos
>=20
> Thanks for the time and effort.
>=20
>> I=E2=80=99ve been selected as MPLS-RT reviewer for =
draft-vainshtein-mpls-gal-tc-
>> ttl-handling-01. Please find my review below.
>>=20
>> I believe this is a useful, coherent, and technically sound document.
>> However, it does have issues that require attention and =
consideration.
>=20
> I'll start discussing these issues here, but hopefully these are not =
points (given your summary) that need delay adoption.
>=20

Certainly non-blocking.

>> Technical Issues:
>>=20
>> 3.1.  New Procedures for Handling the TC Field in an LSE That =
Contains
>>     the GAL
>>=20
>> Setting the value of the TC field in an LSE that contains the GAL is
>> done by the LER that originates the G-ACh packet and is a matter of
>> local policy for that LER.  It is RECOMMENDED that implementations
>> set the TC field of an LSE that contains the GAL to all zero (0b000).
>>=20
>> CMP: If it is a local policy, why the RECOMMENDED language? Why not =
state a
>> default policy, such that lacking any other it is set to 0, but =
RECOMMENDED
>> sounds too strong. In fact, it has no interop considerations, does =
it?
>=20
> 2119 "RECOMMENDED" is the equivalent of "SHOULD". That means that =
implementations "MAY" vary the behavior. In this case, the variance is =
local policy. I think that "RECOMMENDED" means exactly what you suggest, =
viz. "If you don't have a good reason to do otherwise, your default =
behavior is (should be) to set to zero.=E2=80=9D
>=20

My point is that the current text does not say what you say. The text =
says "It is RECOMMENDED that implementations set the TC field of an LSE =
that contains the GAL to all zero (0b000).=E2=80=9D, and that statement =
does not include any qualifiers or conditionals. I understand you say =
that there is an =E2=80=9Cthere may be valid reasons to do otherwise, =
with implications carefully understood before doing so=E2=80=9D implicit =
to the SHOULD. However, that is different than saying =E2=80=9CIn the =
absence of local policy for setting those values, it is RECOMMENDED =
=E2=80=A6=E2=80=9D.

I suggest that a =E2=80=9CAbsent such local policy, =E2=80=9C be =
prepended to the reco.


> I'm happy to be guided by WG opinion on this.
>=20
> I suppose a return question to you is "What damage will it do to make =
this recommendation"?

To me, it is an absolute recommendation without basis on interop, and =
somewhat contradics the previous sentence.

>=20
>> CMP: A nit, is 0b000 the same as 000b? Not sure the notation.
>=20
> I looked at...
>    https://en.wikipedia.org/wiki/Binary_number#Representation
> and found a number of options including:
>      0b100101 (a prefix indicating binary format, common in =
programming languages)

Ack.

>=20
>> The LER that inspects an LSE that contains the GAL MUST ignore the
>> value of the TC field.
>>=20
>> CMP: Similarly, this document concerns itself with maximizing =
interoperability.
>> Why this strongest =E2=80=9CMUST=E2=80=9D? Setting ourselves up for =
updating this when there
>> is a use?
>=20
> I think there is a common misunderstanding of "MUST" in this sort of =
case.
> Consider that when a specific meaning is assigned to the TC in the GAL =
LSE, this will be done in a new document that will update this document.
> It will be really, really important that when new meanings of this TC =
are defined, they pass safely through legacy nodes.
> It's also pretty important that this TC field is not used as a covert =
channel by implementations that might fail to interoperate correctly.
>=20
> So, there is an alternative to "MUST ignore on receipt" and that is =
"MUST set to zero on transmission".
> I'd be happy to go either way.

What if the receiving LER wants to apply a specific TC treatment? That =
is not a covert channel. Can there be different LSPs per TC?

In other words, is the document saying =E2=80=9Con send you can use a =
local policy to set a value, but on receipt there is absolutely no =
reason to read it=E2=80=9D?

>=20
>> 3.2.  New Procedures for Handling the TTL Field in an LSE Containing =
GAL
>>=20
>> CMP: I agree with this comment:
>> http://www.ietf.org/mail-archive/web/mpls/current/msg14300.html
>=20
> I'll respond to George in his thread.
>=20
>> Nits:
>>=20
>> Handling the TC and TTL fields in a Label Stack Entry when the =
Generic
>>                 Associated Channel Label is Present
>>=20
>> CMP: When I read this, I was not sure if the GAL was present in any =
LSE.
>> This is likely just me, but it would be best to disambiguate =
potential
>> misreads (like mine) with "Label Stack Entry (LSE) containing the =
GAL=E2=80=9D
>> (i.e., otherwise present where?)
>=20
> Yup.
>=20
>> I hope these are useful =E2=80=94 thanks!
>=20
> Thanks again.


Thank you for the quick response!

=E2=80=94 Carlos.


>=20
> Adrian
>=20


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From: Ronald Bonica <rbonica@juniper.net>
To: Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>, "mpls-chairs@tools.ietf.org" <mpls-chairs@tools.ietf.org>, "draft-ietf-mpls-self-ping@tools.ietf.org" <draft-ietf-mpls-self-ping@tools.ietf.org>
Thread-Topic: IPR Poll on draft-ietf-mpls-self-ping
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Subject: Re: [mpls] IPR Poll on draft-ietf-mpls-self-ping
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From nobody Mon Jun 29 01:01:10 2015
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Subject: Re: [mpls] IPR Poll on draft-ietf-mpls-self-ping
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Ron,

Thanks for this.

I had a discussion with the tools people and our AD at the time about
whether a disclosure of an IPR on a individual draft is copied forward
when the draft becomes a wg draft.

As far as I remember I was the only one that thought it should be.
Since you say that "Juniper has disclosed IPR regarding ths draft". And
our tools does not reflect it, it is necessary to update when a draft
is adopted as a wg draft.

/Loa

On 2015-06-28 23:58, Ronald Bonica wrote:
> Loa,
>
> Juniper Networks has disclosed IPR regarding this draft. Please see https://datatracker.ietf.org/ipr/2476/.
>
> If necessary, we can update this disclosure to reflect the draft's new filename (draft-ietf-mpls-self-ping).
>
>                                                                                                   Ron
>
>
>> -----Original Message-----
>> From: Loa Andersson [mailto:loa@pi.nu]
>> Sent: Sunday, June 28, 2015 6:00 AM
>> To: mpls@ietf.org; mpls-chairs@tools.ietf.org; draft-ietf-mpls-self-
>> ping@tools.ietf.org
>> Subject: IPR Poll on draft-ietf-mpls-self-ping
>>
>> Working Group,
>>
>> We have started a working group adoption poll on draft-ietf-mpls-self-ping
>>
>> We will do an IPR poll in parallel to the adoption poll.
>>
>> This mail starts the IPR poll.
>>
>> Are you aware of any IPR that applies to draft-ietf-mpls-self-ping?
>>
>> If so, has this IPR been disclosed in compliance with IETF IPR rules (see RFCs
>> 3979, 4879, 3669 and 5378 for more details).
>>
>> There were one IPR disclosure filed against thsi document when it still were
>> an individual document, it has not been re-filed against the working group
>> 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.
>>
>>
>> /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

-- 


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 Jun 29 04:19:42 2015
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To: Eric C Rosen <erosen@juniper.net>, Loa Andersson <loa@pi.nu>,  "mpls@ietf.org" <mpls@ietf.org>, "draft-farrelll-mpls-opportunistic-encrypt@tools.ietf.org" <draft-farrelll-mpls-opportunistic-encrypt@tools.ietf.org>
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Subject: Re: [mpls] Poll to see if we have consensus to adopt draft-farrelll-mpls-opportunistic-encrypt as an MPLS wg document
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Hi Eric,

On 22/06/15 14:24, Eric C Rosen wrote:
> I don't think we can tell yet whether this draft really provides a good
> basis for future work.  As such, it seems premature for the WG to adopt
> it.  I think there are several major issues that should be confronted
> first.
> 
> The draft seems heavily focused on P2P LSPs.  That wouldn't be a problem
> if it were about pseudowire security.  But it's a big problem if the
> draft is supposed to apply to MPLS generally.  There's a lot of MPLS out
> there that uses LDP or BGP (or even IGP) to bind labels to address
> prefixes, thereby creating MP2P LSPs.  If that's not going to be
> handled, I don't see how the draft can claim to be providing an MPLS
> security scheme.

The key exchange in the draft only covers two party cases, yes. That's
deliberate since multi-party key exchange is a really hard problem with
a history of solutions that don't get deployed.

If or when someone documented a way to establish a key between multiple
parties, then that key could be used as documented here. However, I
think it's still better to document both a two party key exchange and
the bulk encryption in one document as we've done, as that combination
is basically the minimum needed to get something useful.

I have no opinion on whether that causes some terminology issue, but
wouldn't have any problem with clarifying any such.

> Of course, it could be that MPLS is not the right layer for security;
> I'm not sure that any one security scheme is going to be suitable for
> all uses of MPLS.

I think it's fairly well accepted that there is no "right layer for
security." What we're doing here I think is documenting a security
mechanism for this layer for use in cases when this layer turns out
to be what someone wants to use.

I don't think it's a goal of this draft to define every cryptographic
security mechanism that will ever be needed for all uses of MPLS, and
I think it'd be unwise to adopt such a goal.

> 
> The idea of applying security on a per-LSP basis doesn't really seem
> right either.  In VPN, with per-address-prefix labeling, there could be
> hundreds of thousands of LSPs.  I can see someone claiming that security
> needs to be provided on a VRF-to-VRF basis rather than on a PE-to-PE
> basis, but having security on a per-address-prefix basis seems like way
> too much granularity.  I can't really tell from the draft how it would
> be intended to apply to VPN, so I don't really know what the authors
> have in mind for securing VPNs.

Is it possible you're missing out on the opportunistic nature of
the scheme here? When you say "securing" a VPN, I would have thought
that one would want endpoint authentication for that, and ways to
do endpoint authentication are outside the scope of this draft. So
any work to address endpoint-authenticated VPNs could build on this
draft, but wouldn't be a part of this draft.

I personally think that the approach of defining the basic mechanism
opportunistically and then figuring out ways to bootstrap from that
to endpoint-authentication is much more likely to work out than if
we followed the approach of trying to define all of the automated
key management needed for multiparty endpoint authentication now.

> The draft would really benefit from having some worked out examples of
> how MPLS security would work in various VPN deployment scenarios,
> including the following (and combinations thereof):
> 
> - Multi-AS VPN with "option b" interconnect
> 
> - Multi-AS VPN with "option c" interconnect
> 
> - VPN with per-address-prefix labels assigned by BGP
> 
> - VPN with per-VRF labels assigned by BGP

Again, I think that the above would be done building on top of this
scheme, but not as part of this scheme. But I admit that I don't myself
understand those deployment scenarios enough to be certain of that.

> The multi-AS VPN cases are particularly interesting, because they make
> use (in different ways) of nested LSPs.  Someone who wants privacy for
> his VPN traffic will want security applied to the inner LSP (the one

(Aside: I'm not sure what you mean by "want security" there, but I
think we maybe don't need to bottom out on that right now. And I also
assume you mean confidentiality when you say privacy.)

> that goes from the ingress PE to the egress PE), not just to the outer
> LSPs (the ones that go from ingress PE to ASBR, etc.) but it's not clear
> whether any of the techniques in the draft can be used that way.

Yes, it ought be possible to nest the scheme. If not, we should fix
it so it can be, but I think that should just work. In any case,
there's no  cryptographic reason why that should be hard so long as
we're talking about nesting.

> There are also cases where labels get assigned to anycast addresses.  I
> wonder how the security scheme would be applied to those cases.

Again, we're only defining a two party key exchange here. More complex
things could be done later.

> 
> There are other issues in the draft as well, such as whether
> MPLS-specific hop-by-hop security is really useful when one can use
> simpler layer 2 security schemes instead. 

Why would layer 2 be simpler? If you mean because it already exists
and can be used that's fine, but I'd be interested if there were some
way in which MACsec were substantively simpler. (I don't believe there
is but maybe I'm wrong.)

> But right now my main concern
> is that the end-to-end scheme will turn out to have very limited
> applicability.
> 
> Working out some realistic examples would help us understand whether
> this is really the right way to proceed.

Actually, I think regardless of what kind of scenario one considers,
you will end up needing to define a two party key exchange and a
way to do the bulk encryption, so I think what's proposed here is
basically the minimum needed to provide any confidentiality service.

I do agree that how one might build from that is something to consider,
but I don't think the WG need to hold off on doing this work in order
to later figure out how to handle much more complex endpoint-
authenticated multiparty scenarios.

Cheers,
S.


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


From nobody Mon Jun 29 06:53:20 2015
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Date: Mon, 29 Jun 2015 15:53:11 +0200
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Subject: Re: [mpls] MPLS-RT review of draft-vainshtein-mpls-gal-tc-ttl-handling-01
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Carlos,

On 2015-06-28 21:07, Carlos Pignataro (cpignata) wrote:
> Hi Adrian,
<snip>

>>

>
> My point is that the current text does not say what you say.
> The text says "It is RECOMMENDED that implementations set the
> TC field of an LSE that contains the GAL to all zero (0b000).”,

> and that statement does not include any qualifiers or conditionals.
> I understand you say that there is an “there may be valid reasons
> to do otherwise, with implications carefully understood before
> doing so” implicit to the SHOULD.

Maybe naive, but I thought SHOULD and RECOMMENDED have the same implicit
conditions, RFC 2119 says:

3. SHOULD   This word, or the adjective "RECOMMENDED", mean that there
    may exist valid reasons in particular circumstances to ignore a
    particular item, but the full implications must be understood and
    carefully weighed before choosing a different course.

/Loa


However, that is different

than saying “In the absence of local policy for setting those values, it 
is RECOMMENDED …”.
>
> I suggest that a “Absent such local policy, “ be prepended to the reco.
>
>
>> I'm happy to be guided by WG opinion on this.
>>
>> I suppose a return question to you is "What damage will it do to make this recommendation"?
>
> To me, it is an absolute recommendation without basis on interop, and somewhat contradics the previous sentence.
>
>>
>>> CMP: A nit, is 0b000 the same as 000b? Not sure the notation.
>>
>> I looked at...
>>     https://en.wikipedia.org/wiki/Binary_number#Representation
>> and found a number of options including:
>>       0b100101 (a prefix indicating binary format, common in programming languages)
>
> Ack.
>
>>
>>> The LER that inspects an LSE that contains the GAL MUST ignore the
>>> value of the TC field.
>>>
>>> CMP: Similarly, this document concerns itself with maximizing interoperability.
>>> Why this strongest “MUST”? Setting ourselves up for updating this when there
>>> is a use?
>>
>> I think there is a common misunderstanding of "MUST" in this sort of case.
>> Consider that when a specific meaning is assigned to the TC in the GAL LSE, this will be done in a new document that will update this document.
>> It will be really, really important that when new meanings of this TC are defined, they pass safely through legacy nodes.
>> It's also pretty important that this TC field is not used as a covert channel by implementations that might fail to interoperate correctly.
>>
>> So, there is an alternative to "MUST ignore on receipt" and that is "MUST set to zero on transmission".
>> I'd be happy to go either way.
>
> What if the receiving LER wants to apply a specific TC treatment? That is not a covert channel. Can there be different LSPs per TC?
>
> In other words, is the document saying “on send you can use a local policy to set a value, but on receipt there is absolutely no reason to read it”?
>
>>
>>> 3.2.  New Procedures for Handling the TTL Field in an LSE Containing GAL
>>>
>>> CMP: I agree with this comment:
>>> http://www.ietf.org/mail-archive/web/mpls/current/msg14300.html
>>
>> I'll respond to George in his thread.
>>
>>> Nits:
>>>
>>> Handling the TC and TTL fields in a Label Stack Entry when the Generic
>>>                  Associated Channel Label is Present
>>>
>>> CMP: When I read this, I was not sure if the GAL was present in any LSE.
>>> This is likely just me, but it would be best to disambiguate potential
>>> misreads (like mine) with "Label Stack Entry (LSE) containing the GAL”
>>> (i.e., otherwise present where?)
>>
>> Yup.
>>
>>> I hope these are useful — thanks!
>>
>> Thanks again.
>
>
> Thank you for the quick response!
>
> — Carlos.
>
>
>>
>> Adrian
>>
>

-- 


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: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: Loa Andersson <loa@pi.nu>, Adrian Farrel <adrian@olddog.co.uk>
Thread-Topic: MPLS-RT review of draft-vainshtein-mpls-gal-tc-ttl-handling-01
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Subject: Re: [mpls] MPLS-RT review of draft-vainshtein-mpls-gal-tc-ttl-handling-01
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Loa,

-----Original Message-----
From: Loa Andersson <loa@pi.nu>
Date: Monday, June 29, 2015 at 9:53 AM
To: Carlos Pignataro <cpignata@cisco.com>, Adrian Farrel
<adrian@olddog.co.uk>
Cc: "draft-vainshtein-mpls-gal-tc-ttl-handling@tools.ietf.org"
<draft-vainshtein-mpls-gal-tc-ttl-handling@tools.ietf.org>,
"mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "mpls@ietf.org"
<mpls@ietf.org>
Subject: Re: MPLS-RT review of draft-vainshtein-mpls-gal-tc-ttl-handling-01

>Carlos,
>
>On 2015-06-28 21:07, Carlos Pignataro (cpignata) wrote:
>> Hi Adrian,
><snip>
>
>>>
>
>>
>> My point is that the current text does not say what you say.
>> The text says "It is RECOMMENDED that implementations set the
>> TC field of an LSE that contains the GAL to all zero (0b000).=B2,
>
>> and that statement does not include any qualifiers or conditionals.
>> I understand you say that there is an =B3there may be valid reasons
>> to do otherwise, with implications carefully understood before
>> doing so=B2 implicit to the SHOULD.
>
>Maybe naive, but I thought SHOULD and RECOMMENDED have the same implicit
>conditions, RFC 2119 says:
>
>3. SHOULD   This word, or the adjective "RECOMMENDED", mean that there
>    may exist valid reasons in particular circumstances to ignore a
>    particular item, but the full implications must be understood and
>    carefully weighed before choosing a different course.

That does not mean =B3Absent local policy, then it is RECOMMENDED =8A=B2. T=
he
text shows an absolute recommendation.

Carlos.

>
>/Loa
>
>
>However, that is different
>
>than saying =B3In the absence of local policy for setting those values, it
>is RECOMMENDED =8A=B2.
>>
>> I suggest that a =B3Absent such local policy, =B3 be prepended to the re=
co.
>>
>>
>>> I'm happy to be guided by WG opinion on this.
>>>
>>> I suppose a return question to you is "What damage will it do to make
>>>this recommendation"?
>>
>> To me, it is an absolute recommendation without basis on interop, and
>>somewhat contradics the previous sentence.
>>
>>>
>>>> CMP: A nit, is 0b000 the same as 000b? Not sure the notation.
>>>
>>> I looked at...
>>>     https://en.wikipedia.org/wiki/Binary_number#Representation
>>> and found a number of options including:
>>>       0b100101 (a prefix indicating binary format, common in
>>>programming languages)
>>
>> Ack.
>>
>>>
>>>> The LER that inspects an LSE that contains the GAL MUST ignore the
>>>> value of the TC field.
>>>>
>>>> CMP: Similarly, this document concerns itself with maximizing
>>>>interoperability.
>>>> Why this strongest =B3MUST=B2? Setting ourselves up for updating this
>>>>when there
>>>> is a use?
>>>
>>> I think there is a common misunderstanding of "MUST" in this sort of
>>>case.
>>> Consider that when a specific meaning is assigned to the TC in the GAL
>>>LSE, this will be done in a new document that will update this document.
>>> It will be really, really important that when new meanings of this TC
>>>are defined, they pass safely through legacy nodes.
>>> It's also pretty important that this TC field is not used as a covert
>>>channel by implementations that might fail to interoperate correctly.
>>>
>>> So, there is an alternative to "MUST ignore on receipt" and that is
>>>"MUST set to zero on transmission".
>>> I'd be happy to go either way.
>>
>> What if the receiving LER wants to apply a specific TC treatment? That
>>is not a covert channel. Can there be different LSPs per TC?
>>
>> In other words, is the document saying =B3on send you can use a local
>>policy to set a value, but on receipt there is absolutely no reason to
>>read it=B2?
>>
>>>
>>>> 3.2.  New Procedures for Handling the TTL Field in an LSE Containing
>>>>GAL
>>>>
>>>> CMP: I agree with this comment:
>>>> http://www.ietf.org/mail-archive/web/mpls/current/msg14300.html
>>>
>>> I'll respond to George in his thread.
>>>
>>>> Nits:
>>>>
>>>> Handling the TC and TTL fields in a Label Stack Entry when the Generic
>>>>                  Associated Channel Label is Present
>>>>
>>>> CMP: When I read this, I was not sure if the GAL was present in any
>>>>LSE.
>>>> This is likely just me, but it would be best to disambiguate potential
>>>> misreads (like mine) with "Label Stack Entry (LSE) containing the GAL=
=B2
>>>> (i.e., otherwise present where?)
>>>
>>> Yup.
>>>
>>>> I hope these are useful =8B thanks!
>>>
>>> Thanks again.
>>
>>
>> Thank you for the quick response!
>>
>> =8B Carlos.
>>
>>
>>>
>>> Adrian
>>>
>>
>
>--=20
>
>
>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] Poll to see if we have consensus to adopt draft-farrelll-mpls-opportunistic-encrypt as an MPLS wg document
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On 6/29/2015 7:19 AM, Stephen Farrell wrote:
> What we're doing here I think is documenting a security
> mechanism for this layer for use in cases when this layer turns out
> to be what someone wants to use.

That sounds like a solution in search of a problem.

My point is that between the applicability restrictions (no MP2P) and 
the excessive granularity (security state per label), it's hard to see 
that this is a reasonable approach.  Even if you brought it to PALS and 
renamed it to be "pseudowire security", the need to have security state 
per pseudowire seems like a problem.

>> The draft would really benefit from having some worked out examples of
>> how MPLS security would work in various VPN deployment scenarios,

> Again, I think that the above would be done building on top of this
> scheme, but not as part of this scheme. But I admit that I don't myself
> understand those deployment scenarios enough to be certain of that.

First design the hammer, then figure out later whether we need to pound 
any nails?

I'd have thought that before the WG adopts the draft, there should be 
some clue as to how the proposed MPLS security mechanism would be 
applied to most of the uses of MPLS.  When asked about how it might work 
in various common deployment scenarios, I don't think it's appropriate 
to say "first we need to design the mechanisms, later on we'll figure 
out how to use them to actually solve problems".

> Why would layer 2 [security] be simpler? If you mean because it already exists
> and can be used that's fine, but I'd be interested if there were some
> way in which MACsec were substantively simpler.

No impact to MPLS, fixed and unchanging granularity (per-link rather 
than per-LSP), reduced state (no constantly changing nonce per label, no 
key per label) simplified data flow (security processing cleanly 
separated from network layer processing), not to mention simplified key 
distribution.  I'm having trouble seeing what hop-by-hop MPLS security 
adds except more complexity.








From nobody Mon Jun 29 14:12:13 2015
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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'Carlos Pignataro \(cpignata\)'" <cpignata@cisco.com>, "'Loa Andersson'" <loa@pi.nu>
References: <817278D5-7352-49F4-A4AE-A0358A91288E@cisco.com> <066801d0b1c4$4846f2e0$d8d4d8a0$@olddog.co.uk> <7AB7C826-B9C5-4260-971F-FA4E4BDB8233@cisco.com> <55914DC7.5080101@pi.nu> <D1B6CB5D.1C5FA%cpignata@cisco.com>
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Date: Mon, 29 Jun 2015 22:12:05 +0100
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Subject: Re: [mpls] MPLS-RT review of draft-vainshtein-mpls-gal-tc-ttl-handling-01
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I'd like to avoid going round and round on this (partly because I am too =
busy to
be pedantic today :-)

> >> My point is that the current text does not say what you say.
> >> The text says "It is RECOMMENDED that implementations set the
> >> TC field of an LSE that contains the GAL to all zero (0b000).=B2,
> >
> >> and that statement does not include any qualifiers or conditionals.
> >> I understand you say that there is an =B3there may be valid reasons
> >> to do otherwise, with implications carefully understood before
> >> doing so=B2 implicit to the SHOULD.
> >
> >Maybe naive, but I thought SHOULD and RECOMMENDED have the same
> > implicit conditions, RFC 2119 says:
> >
> >3. SHOULD   This word, or the adjective "RECOMMENDED", mean that =
there
> >    may exist valid reasons in particular circumstances to ignore a
> >    particular item, but the full implications must be understood and
> >    carefully weighed before choosing a different course.
>=20
> That does not mean =B3Absent local policy, then it is RECOMMENDED =
=D0=B2. The
> text shows an absolute recommendation.

There is no such thing as "an absolute recommendation" because a 2119
recommendation is a should.

[Aside: Two years ago, in an airport not far from Washington DC...
TSA Officer: You are recommended to remove your shoes.
Me: No thanks, I'm OK with them on.
TSA Officer: No sir, you are recommended to remove your shoes.
Me: I think I'll be OK with them on.=20
TSA Officer (louder): Sir! You are recommended to remove your shoes.
Me: Ah, I see. I'm sorry. I didn't realise. You're telling me to remove =
my
shoes.
TSA Officer: No sir, I cannot tell you to remove your shoes.

When we do a 2119 recommendation we mean "absent a reason to do =
otherwise".

But the crunch is that the documentation needs to give advice about when =
to vary
from the recommendation.
I thought we had that covered, albeit implicitly, by the previous =
sentence.

However, I have no problem with being super-explicit.

OLD
   Setting the value of the TC field in an LSE that contains the GAL is
   done by the LER that originates the G-ACh packet and is a matter of
   local policy for that LER.  It is RECOMMENDED that implementations
   set the TC field of an LSE that contains the GAL to all zero (0b000).
NEW
   Setting the value of the TC field in an LSE that contains the GAL is
   done by the LER that originates the G-ACh packet and is a matter of
   local policy for that LER.  It is RECOMMENDED that implementations
   set the TC field of an LSE that contains the GAL to all zero (0b000), =

   but they MAY vary this according to local policy.
END

Ciao,
Adrian


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Subject: Re: [mpls] Poll to see if we have consensus to adopt draft-farrelll-mpls-opportunistic-encrypt as an MPLS wg document
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On 29/06/15 20:05, Eric C Rosen wrote:
> On 6/29/2015 7:19 AM, Stephen Farrell wrote:
>> What we're doing here I think is documenting a security
>> mechanism for this layer for use in cases when this layer turns out
>> to be what someone wants to use.
> 
> That sounds like a solution in search of a problem.

I guess it could if one wants to be argumentative but I'm
interested that other folks here who know far more about mpls
than I think this ought be adopted, so presumably others
disagree with your evaluation.

I would repeat though, that even if one wants some additional
more complex functionality later starting now with a simpler
specification on which one can build is IMO a far better and
much more practical approach when considering key management.

That said, I'm just a plumber here, and it's really for others
to say that they'd find this useful I think.

> 
> My point is that between the applicability restrictions (no MP2P) and
> the excessive granularity (security state per label), 

I'm not clear how one could avoid some state per LSP (is that
the same as per-label?) without getting into multiparty key
management, which is a technology with very little deployment
no matter the layer at which it is defined.

> it's hard to see
> that this is a reasonable approach.  Even if you brought it to PALS and
> renamed it to be "pseudowire security", the need to have security state
> per pseudowire seems like a problem.
> 
>>> The draft would really benefit from having some worked out examples of
>>> how MPLS security would work in various VPN deployment scenarios,
> 
>> Again, I think that the above would be done building on top of this
>> scheme, but not as part of this scheme. But I admit that I don't myself
>> understand those deployment scenarios enough to be certain of that.
> 
> First design the hammer, then figure out later whether we need to pound
> any nails?

Isn't that purely pejorative? I don't see how that's helpful.

> 
> I'd have thought that before the WG adopts the draft, there should be
> some clue as to how the proposed MPLS security mechanism would be
> applied to most of the uses of MPLS.  When asked about how it might work
> in various common deployment scenarios, I don't think it's appropriate
> to say "first we need to design the mechanisms, later on we'll figure
> out how to use them to actually solve problems".

Again, we're positing a two party key exchange here. If the WG don't
think that's useful that's fine. But (to up my rhetoric in response
to yours:-) asking to boil the multiparty key exchange ocean before
doing anything would be a fine recipe for doing nothing at all.

> 
>> Why would layer 2 [security] be simpler? If you mean because it
>> already exists
>> and can be used that's fine, but I'd be interested if there were some
>> way in which MACsec were substantively simpler.
> 
> No impact to MPLS, fixed and unchanging granularity (per-link rather
> than per-LSP), reduced state (no constantly changing nonce per label, no
> key per label) simplified data flow (security processing cleanly
> separated from network layer processing), not to mention simplified key
> distribution.  I'm having trouble seeing what hop-by-hop MPLS security
> adds except more complexity.

I disagree that that makes layer 2 security much simpler. It means
the complexity is hidden from the layer above, which is a benefit if
you don't need to see it, but most of the complexity is there just
as much even if hidden. Bear in mind that we are not saying that
there's anything wrong with layer 2 security here, but claiming
that it's that much simpler isn't convincing.

Cheers,
S.


> 
> 
> 
> 
> 
> 
> 
> 
> 


From nobody Tue Jun 30 04:24:18 2015
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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'Stephen Farrell'" <stephen.farrell@cs.tcd.ie>, "'Eric C Rosen'" <erosen@juniper.net>, "'Loa Andersson'" <loa@pi.nu>, <mpls@ietf.org>, <draft-farrelll-mpls-opportunistic-encrypt@tools.ietf.org>
References: <55828B69.3070603@pi.nu> <55880C91.507@juniper.net> <559129C8.7000407@cs.tcd.ie> <559196F1.90006@juniper.net> <5591BE65.3080409@cs.tcd.ie>
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Cc: mpls-chairs@tools.ietf.org
Subject: Re: [mpls] Poll to see if we have consensus to adopt draft-farrelll-mpls-opportunistic-encrypt as an MPLS wg document
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I think there are two things going on in one conversation. There is =
multi-party key exchange that one might need for P2MP or MP2P so that =
all senders/receivers on a multi(>2)-party LSP have the sam key. And =
there is multi-LSP keying where all LSPs (or a subset of all LSPs?) =
between a pair of LSRs use the same key.

The former would be ugly especially in an opportunistic world. That =
limits the applicability of MPLS-OS to P2P LSPs. Eric is right that this =
cuts out "routed MPLS" so that the classic LDP application would be =
unable to use MPLS-OS. (Although, there may be scope to identify the =
sender or the MPLS-OS SA per packet as is done for OAM - the question is =
whether it can be handled at line rate for a large number of senders.)=20

So this degrades to determining whether MPLS-OS would be useful if =
limited to TE LSPs (RSVP-TE and static provisioning) and PWs (T-LDP and =
static provisioning).


The second issue is a trade...
- maintain security state per LSP
versus
- maintain a nonce across LSPs
- handle "all or nothing" for LSPs between a pair of LSRs


My feeling from various conversations over the last 18 months is that =
the desired applicability is for virtual links that span multiple hops =
in an MPLS network (which maps to TE LSPs and PWs quite well), and that =
OS would be enabled in a somewhat ad hoc manner on key LSPs but not all =
of them.

I think that at this point we need operators to speak. Even though we =
are still looking at this as an experiment and a feasibility study, it =
would help a lot to know where and how this might get used.

And that last point cuts a little into "a solution in search of a =
problem". We know, in general that there is a problem with wholesale =
tapping of data in tier 1 networks: and we know that organised crime is =
in this business. We also know that individual users should but do not =
protect their own transactions, and would find it hard to protect their =
metadata. So there is a problem that needs attention. Is this the single =
solution that will fix it? No. Could it be a tool to help? That is what =
we would like to find out. Is a WG Experimental I-D something vendors =
should feel pressure to implement? No, absolutely not especially if the =
operators on this list are not joining in the discussion.=20

Thanks,
Adrian


> -----Original Message-----
> From: Stephen Farrell [mailto:stephen.farrell@cs.tcd.ie]
> Sent: 29 June 2015 22:54
> To: Eric C Rosen; Loa Andersson; mpls@ietf.org; =
draft-farrelll-mpls-opportunistic-
> encrypt@tools.ietf.org
> Cc: mpls-chairs@tools.ietf.org
> Subject: Re: [mpls] Poll to see if we have consensus to adopt =
draft-farrelll-mpls-
> opportunistic-encrypt as an MPLS wg document
>=20
>=20
>=20
> On 29/06/15 20:05, Eric C Rosen wrote:
> > On 6/29/2015 7:19 AM, Stephen Farrell wrote:
> >> What we're doing here I think is documenting a security
> >> mechanism for this layer for use in cases when this layer turns out
> >> to be what someone wants to use.
> >
> > That sounds like a solution in search of a problem.
>=20
> I guess it could if one wants to be argumentative but I'm
> interested that other folks here who know far more about mpls
> than I think this ought be adopted, so presumably others
> disagree with your evaluation.
>=20
> I would repeat though, that even if one wants some additional
> more complex functionality later starting now with a simpler
> specification on which one can build is IMO a far better and
> much more practical approach when considering key management.
>=20
> That said, I'm just a plumber here, and it's really for others
> to say that they'd find this useful I think.
>=20
> >
> > My point is that between the applicability restrictions (no MP2P) =
and
> > the excessive granularity (security state per label),
>=20
> I'm not clear how one could avoid some state per LSP (is that
> the same as per-label?) without getting into multiparty key
> management, which is a technology with very little deployment
> no matter the layer at which it is defined.
>=20
> > it's hard to see
> > that this is a reasonable approach.  Even if you brought it to PALS =
and
> > renamed it to be "pseudowire security", the need to have security =
state
> > per pseudowire seems like a problem.
> >
> >>> The draft would really benefit from having some worked out =
examples of
> >>> how MPLS security would work in various VPN deployment scenarios,
> >
> >> Again, I think that the above would be done building on top of this
> >> scheme, but not as part of this scheme. But I admit that I don't =
myself
> >> understand those deployment scenarios enough to be certain of that.
> >
> > First design the hammer, then figure out later whether we need to =
pound
> > any nails?
>=20
> Isn't that purely pejorative? I don't see how that's helpful.
>=20
> >
> > I'd have thought that before the WG adopts the draft, there should =
be
> > some clue as to how the proposed MPLS security mechanism would be
> > applied to most of the uses of MPLS.  When asked about how it might =
work
> > in various common deployment scenarios, I don't think it's =
appropriate
> > to say "first we need to design the mechanisms, later on we'll =
figure
> > out how to use them to actually solve problems".
>=20
> Again, we're positing a two party key exchange here. If the WG don't
> think that's useful that's fine. But (to up my rhetoric in response
> to yours:-) asking to boil the multiparty key exchange ocean before
> doing anything would be a fine recipe for doing nothing at all.
>=20
> >
> >> Why would layer 2 [security] be simpler? If you mean because it
> >> already exists
> >> and can be used that's fine, but I'd be interested if there were =
some
> >> way in which MACsec were substantively simpler.
> >
> > No impact to MPLS, fixed and unchanging granularity (per-link rather
> > than per-LSP), reduced state (no constantly changing nonce per =
label, no
> > key per label) simplified data flow (security processing cleanly
> > separated from network layer processing), not to mention simplified =
key
> > distribution.  I'm having trouble seeing what hop-by-hop MPLS =
security
> > adds except more complexity.
>=20
> I disagree that that makes layer 2 security much simpler. It means
> the complexity is hidden from the layer above, which is a benefit if
> you don't need to see it, but most of the complexity is there just
> as much even if hidden. Bear in mind that we are not saying that
> there's anything wrong with layer 2 security here, but claiming
> that it's that much simpler isn't convincing.
>=20
> Cheers,
> S.
>=20
>=20
> >
> >
> >
> >
> >
> >
> >
> >
> >


From nobody Tue Jun 30 04:31:01 2015
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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: <lizho.jin@gmail.com>, "'loa'" <loa@pi.nu>, "'mpls'" <mpls@ietf.org>, "'mpls-chairs'" <mpls-chairs@tools.ietf.org>, "'draft-ietf-mpls-lsp-ping-relay-reply'" <draft-ietf-mpls-lsp-ping-relay-reply@tools.ietf.org>,  "'db3546'" <db3546@att.com>
References: <55658C63.5020209@pi.nu>, <04a101d09fad$72a48e90$57edabb0$@olddog.co.uk>, <2015060823572860485834@gmail.com>, <0cc101d0a92b$58745050$095cf0f0$@olddog.co.uk> <2015061817462442258541@gmail.com>
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Subject: Re: [mpls] MPLS working group last call on draft-ietf-mpls-lsp-ping-relay-reply
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I'm fine with all this. Thanks.
=20
See follow-up to catch one of George's points.
=20
Adrian
=20
From: lizho.jin@gmail.com [mailto:lizho.jin@gmail.com]=20
Sent: 18 June 2015 10:46
To: adrian; loa; mpls; mpls-chairs; =
draft-ietf-mpls-lsp-ping-relay-reply; db3546
Subject: Re: [mpls] MPLS working group last call on =
draft-ietf-mpls-lsp-ping-relay-reply
=20
Hi Adrian,
Thanks for the reply. Please see inline below.
=20
  _____ =20

Regards
Lizhong
=20
From: Adrian Farrel <mailto:adrian@olddog.co.uk>=20
Date: 2015-06-18 02:28
To: lizho.jin@gmail.com; 'loa' <mailto:loa@pi.nu> ; 'mpls' =
<mailto:mpls@ietf.org> ; 'mpls-chairs' =
<mailto:mpls-chairs@tools.ietf.org> ; =
'draft-ietf-mpls-lsp-ping-relay-reply' =
<mailto:draft-ietf-mpls-lsp-ping-relay-reply@tools.ietf.org> ; 'db3546' =
<mailto:db3546@att.com>=20
Subject: RE: [mpls] MPLS working group last call on =
draft-ietf-mpls-lsp-ping-relay-reply
Lizhong,
=20
Apologies, I fumbled your response.
=20
I snipped out the stuff we agree on.
=20
> Thank you for the review. Please see my reply inline below. Correct me
> if other authors have different opinion.
>=20
> I will update the draft after the end of last call.
=20
>> Just being a good citizen and reviewing this I-D during WG last call.
>> I didn't have much time so I only found a number of nits most of =
which
>> are probably not significant.
>> ---
>>=20
>> idnits notes the presence of a pre-RFC5378 disclaimer. Do you really=20
>> need that?
>> [Lizhong] this may need the answer from chairs and AD. We only follow
>> the rules.
=20
If you are following the rules, that's fine. I think the rules are that =
you only
need to include the disclaimer if text included in the document was =
written
before the date of RFC 5378 and if at least one of the authors of the =
text has
not given up their copyright as described in that RFC.
=20
[snip]
=20
>> Section 4.1
>>=20
>>   The source UDP port field MUST be set
>>   to the source UDP port.
>>=20
>> There is no "source UDP port" field. Perhaps the "Initiator Source =
Port"
>> field?
>>=20
>> But also, this text is quite confusing. The text in 3.2 is much =
clearer.
> [Lizhong] yes, should be:=20
> The source UDP port field MUST be set to the initiator source port.
=20
Hmmm, I think...
=20
"The Initiator Source Port field MUST be set to the source UDP port."
[Lizhong] accepted.
=20
[snip]
=20
> [Lizhong] traceroute is not mandatory before ping. If operator has =
knowledge=20
> of the relay nodes, the initiator could directly send ping with Relay =
Node=20
> Address Stack TLV containing the already known relay nodes.
=20
That would make a valuable addition to 4.1, as well.
[Lizhong] OK, then we could add the following in section 4 to avoid =
misunderstanding:
In the following section, we describe the relay reply procedures with =
traceroute=20
operation. If operator has knowledge of the relay nodes, the initiator =
could do LSP=20
Ping by directly sending Echo Request with Relay Node Address Stack TLV=20
containing the already known relay nodes.
=20
[snip]
=20
>> I tried to work out how things would pan out if two ASes on the path=20
>> used the same address space within their AS. Would an address appear =
in
>> the stack and seem to be routable when it is really an address in the
>> other AS?
> [Lizhong] we have an example in section 5. And address of P1 and P2 =
could be=20
> same. In that case, ASBR1 must adds its interface address facing ASBR2 =
with=20
> the K bit set. Then relay reply will not be miss-routed.
=20
Ah, I get it.
But this relies on ASBT1 setting the K bit.=20
So I suspect this needs to not be a special case: you need to require =
that the
domain boundary always sets the K bit.
[Lizhong] yes, we use "SHOULD" to make the requirement. See below =
description in section 4.2:
If a node spans two addressing domains (with respect to this=20
message) where nodes on either side may not be able to reach nodes in =
the=20
other domain, then the final address added SHOULD set the K bit.
=20
[snip]
=20
>> The third case in 4.5 is when the receiver does not understand the =
TLV
>> and ignores it. In this case it will send an Echo Reply without =
itself
>> including the TLV.
> [Lizhong] the receiver is unable to send the Echo Reply, because it =
does
> know the destination IP address and UDP port number. So if the =
receiver
> could not understand the TLV, then the relay message will be dropped.
=20
Section 4.5 of 4379 says:
=20
   The destination IP address and UDP port are copied from the
   source IP address and UDP port of the echo request.
=20
That is what the legacy receiver will attempt to do. It doesn't matter =
whether
the optional Relay Node Address Stack TLV is in the echo request message =
or not,
the legacy node will follow 4379. So it *will* be able to respond.
[Lizhong] Are you referring the case when the receiver receives Echo =
Request? In that
case, yes, it will respond without including the TLV. It is a sub-case =
of case 1. And I
will add the following in the first case:
If the receiver does not recognize the Relay Node Address Stack TLV, as =
per=20
section 3 and 4.5 of [RFC4379], it will send an Echo Reply without =
including the TLV.
If you are referring the case when the receiver receives Relayed Echo =
Reply, if it could
not understand the TLV, it will also not understand the message type =
"Relayed Echo Reply".
So the packet will be dropped.
=20
>> Section 6 should note that the new TLV provides a way for Echo Reply
>> messages to be diverted so that information can be collected. For
>> example, if a stack entry can be inserted, the Echo Reply messages =
can
>> be caused to transit another AS unrelated to the LSP under test. =
Since
>> the Echo Reply reveals path information about the LSP, this is a
>> valuable attack.  Having said that, you can say how this TLV is=20
>> protected in the Echo Reply message.
>=20
> [Lizhong] Do you mean the new TLV could be used to collect path =
information
> unrelated to the LSP under test? This is not true. Only the node along =
the
LSP=20
> will add path information into the new TLV. The relay node in the new =
TLV
> will only relay the Echo Reply to the initiator, and will not add =
information
to
> the new TLV.
=20
I think you misunderstand how security attacks might work. Suppose I am =
able to
do one of two things:
1. Modify the control plane code on a router that adds or processes a
    Relay Node Address Stack TLV so that it adds a bogus entry to the
     TLV. The prospect of modifications to control plane code is =
generally
     considered to be so disastrous that it is just noted without any=20
     further precautions (after all, if you can get at the control plane
     code, you can make the routers do anything).
2. Intercept and modify a packet in transit. This is the main risk I am=20
    talking about.
[Lizhong] If one router's control plane in the network is hijacked, it =
could send any=20
information to the third party. It is a general problem. But I =
understand you concern.
I will add the following to try to mitigate your concern.
The Relay Node Address Stack TLV has the path information of the LSP, =
and=20
such information may be maliciously used by any uncontrolled LSR/LER. We =
have
two ways to reduce the path information in the TLV:
1. it is recommended to clear the K bit in the relay address entry =
unless you have to.
2. it is encouraged to use NIL address entry to hide node information if =
possible.
=20
Cheers,
Adrian
=20

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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-GB link=3Dblue =
vlink=3Dpurple style=3D'tab-interval:36.0pt'><div =
class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-fon=
t-family:"Times New Roman";color:#1F497D'>I'm fine with all this. =
Thanks.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-fon=
t-family:"Times New Roman";color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-fon=
t-family:"Times New Roman";color:#1F497D'>See follow-up to catch one of =
George's points.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-fon=
t-family:"Times New Roman";color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-fon=
t-family:"Times New Roman";color:#1F497D'>Adrian<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-fon=
t-family:"Times New =
Roman";color:#1F497D'><o:p>&nbsp;</o:p></span></p><div =
style=3D'border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt'><div><div style=3D'border:none;border-top:solid #B5C4DF =
1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=3DMsoNormal><b><span =
lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-f=
ont-family:"Times New =
Roman";mso-ansi-language:EN-US'>From:</span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-f=
ont-family:"Times New Roman";mso-ansi-language:EN-US'> =
lizho.jin@gmail.com [mailto:lizho.jin@gmail.com] <br><b>Sent:</b> 18 =
June 2015 10:46<br><b>To:</b> adrian; loa; mpls; mpls-chairs; =
draft-ietf-mpls-lsp-ping-relay-reply; db3546<br><b>Subject:</b> Re: =
[mpls] MPLS working group last call on =
draft-ietf-mpls-lsp-ping-relay-reply<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>Hi Adrian,<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>Thanks for the reply. Please see inline =
below.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'><o:p>&nbsp;</o:p></span></p></div><div =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'><hr size=3D1 width=3D210 style=3D'width:157.5pt' =
noshade style=3D'color:#B5C4DF' align=3Dleft></span></div><div><div =
style=3D'margin-left:7.5pt;margin-top:7.5pt;margin-right:7.5pt;margin-bot=
tom:7.5pt'><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";mso-fareast-=
font-family:"Times New =
Roman";color:black'>Regards<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana","sans-serif";mso-fareast-=
font-family:"Times New =
Roman";color:black'>Lizhong<o:p></o:p></span></p></div></div></div><block=
quote style=3D'margin-left:6.0pt'><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><div><div><p class=3DMsoNormal =
style=3D'background:#EFEFEF'><b><span =
style=3D'font-size:9.0pt;font-family:"Tahoma","sans-serif";mso-fareast-fo=
nt-family:"Times New Roman";color:black'>From:</span></b><span =
style=3D'font-size:9.0pt;font-family:"Tahoma","sans-serif";mso-fareast-fo=
nt-family:"Times New Roman";color:black'>&nbsp;<a =
href=3D"mailto:adrian@olddog.co.uk">Adrian =
Farrel</a><o:p></o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'background:#EFEFEF'><b><span =
style=3D'font-size:9.0pt;font-family:"Tahoma","sans-serif";mso-fareast-fo=
nt-family:"Times New Roman";color:black'>Date:</span></b><span =
style=3D'font-size:9.0pt;font-family:"Tahoma","sans-serif";mso-fareast-fo=
nt-family:"Times New =
Roman";color:black'>&nbsp;2015-06-18&nbsp;02:28<o:p></o:p></span></p></di=
v><div><p class=3DMsoNormal style=3D'background:#EFEFEF'><b><span =
style=3D'font-size:9.0pt;font-family:"Tahoma","sans-serif";mso-fareast-fo=
nt-family:"Times New Roman";color:black'>To:</span></b><span =
style=3D'font-size:9.0pt;font-family:"Tahoma","sans-serif";mso-fareast-fo=
nt-family:"Times New Roman";color:black'>&nbsp;<a =
href=3D"mailto:lizho.jin@gmail.com">lizho.jin@gmail.com</a>; <a =
href=3D"mailto:loa@pi.nu">'loa'</a>; <a =
href=3D"mailto:mpls@ietf.org">'mpls'</a>; <a =
href=3D"mailto:mpls-chairs@tools.ietf.org">'mpls-chairs'</a>; <a =
href=3D"mailto:draft-ietf-mpls-lsp-ping-relay-reply@tools.ietf.org">'draf=
t-ietf-mpls-lsp-ping-relay-reply'</a>; <a =
href=3D"mailto:db3546@att.com">'db3546'</a><o:p></o:p></span></p></div><d=
iv><p class=3DMsoNormal style=3D'background:#EFEFEF'><b><span =
style=3D'font-size:9.0pt;font-family:"Tahoma","sans-serif";mso-fareast-fo=
nt-family:"Times New Roman";color:black'>Subject:</span></b><span =
style=3D'font-size:9.0pt;font-family:"Tahoma","sans-serif";mso-fareast-fo=
nt-family:"Times New Roman";color:black'>&nbsp;RE: [mpls] MPLS working =
group last call on =
draft-ietf-mpls-lsp-ping-relay-reply<o:p></o:p></span></p></div></div></d=
iv><div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>Lizhong,<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>Apologies, I fumbled your =
response.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>I snipped out the stuff we agree =
on.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt; Thank you for the review. Please see my reply =
inline below. Correct me<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt; if other authors have different =
opinion.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;<o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt; I will update the draft after the end of last =
call.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; Just being a good citizen and reviewing =
this I-D during WG last call.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; I didn't have much time so I only found a =
number of nits most of which<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; are probably not =
significant.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; ---<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; <o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; idnits notes the presence of a pre-RFC5378 =
disclaimer. Do you really <o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; need =
that?<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; [Lizhong] this may need the answer from =
chairs and AD. We only follow<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; the =
rules.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>If you are following the rules, that's fine. I think =
the rules are that you only<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>need to include the disclaimer if text included in =
the document was written<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>before the date of RFC 5378 and if at least one of =
the authors of the text has<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>not given up their copyright as described in that =
RFC.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>[snip]<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; Section =
4.1<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt;&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt;&nbsp;&nbsp; The source UDP port field MUST =
be set<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt;&nbsp;&nbsp; to the source UDP =
port.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt;&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; There is no &quot;source UDP port&quot; =
field. Perhaps the &quot;Initiator Source =
Port&quot;<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; field?<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt;&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; But also, this text is quite confusing. The =
text in 3.2 is much clearer.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt; [Lizhong] yes, should =
be:&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt; The source UDP port field MUST be set&nbsp;to =
the initiator&nbsp;source port.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>Hmmm, I think...<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&quot;The Initiator Source Port field MUST be set to =
the source UDP port.&quot;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>[Lizhong] =
accepted.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>[snip]<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt; [Lizhong] traceroute is not mandatory before =
ping. If operator has knowledge&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt; of the relay nodes, the initiator could =
directly send ping with&nbsp;Relay =
Node&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt; Address Stack TLV containing the already known =
relay nodes.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>That would make a valuable addition to 4.1, as =
well.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>[Lizhong] OK, then we could add the following in =
section 4 to avoid misunderstanding:<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>In the following section, we describe the relay =
reply procedures with =
traceroute&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>operation. If operator has knowledge of the relay =
nodes, the initiator could do =
LSP&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>Ping by directly sending Echo Request with Relay =
Node Address Stack TLV&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>containing the already known relay =
nodes.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>[snip]<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; I tried to work out how things would pan =
out if two ASes on the path <o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; used the same address space within their =
AS. Would an address appear in<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; the stack and seem to be routable when it =
is really an address in the<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; other =
AS?<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt; [Lizhong] we have an example in section 5. And =
address of P1 and P2 could be&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt; same. In that&nbsp;case, ASBR1 must&nbsp;adds =
its&nbsp;interface address facing ASBR2 =
with&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt; the K bit set. Then relay reply will not be =
miss-routed.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>Ah, I get it.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>But this relies on ASBT1 setting the K bit. =
<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>So I suspect this needs to not be a special case: =
you need to require that the<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>domain boundary always sets the K =
bit.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>[Lizhong] yes, we use &quot;SHOULD&quot; to make the =
requirement. See below description in section =
4.2:<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>If a node spans two addressing domains (with respect =
to this <br>message) where nodes on either side may not be able to reach =
nodes in the <br>other domain, then the final address added SHOULD set =
the K bit.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>[snip]<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; The third case in 4.5 is when the receiver =
does not understand the TLV<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; and ignores it. In this case it will send =
an Echo Reply without itself<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; including the =
TLV.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt; [Lizhong] the receiver is unable to send the =
Echo Reply, because it does<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt; know the destination IP address and UDP port =
number. So if the receiver<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt; could not understand the TLV, then the relay =
message will be dropped.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>Section 4.5 of 4379 =
says:<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;&nbsp; The destination IP address and UDP port =
are copied from the<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;&nbsp; source IP address and UDP port of the =
echo request.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>That is what the legacy receiver will attempt to do. =
It doesn't matter whether<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>the optional Relay Node Address Stack TLV is in the =
echo request message or not,<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>the legacy node will follow 4379. So it *will* be =
able to respond.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>[Lizhong] Are you referring the case when the =
receiver receives&nbsp;Echo Request? In =
that<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>case, yes, it will respond without including the =
TLV. It is a sub-case of case 1. And =
I<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>will add the following in the first =
case:<o:p></o:p></span></p></div><div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>If the receiver does not recognize the&nbsp;<span =
style=3D'background:white'>Relay Node Address Stack&nbsp;TLV, as =
per&nbsp;</span><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black;background:white'>section 3 and 4.5 of [RFC4379], it =
will&nbsp;send an Echo Reply without&nbsp;including the TLV.</span><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'><o:p></o:p></span></p></div></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>If you are referring&nbsp;<span =
style=3D'background:white'>the case when the receiver =
receives&nbsp;Relayed Echo Reply, if it =
could</span><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black;background:white'>not understand the TLV, it will =
also not understand the message type &quot;Relayed Echo =
Reply&quot;.</span><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black;background:white'>So the packet will be =
dropped.</span><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; Section 6 should note that the new TLV =
provides a way for Echo Reply<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; messages to be diverted so that information =
can be collected. For<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; example, if a stack entry can be inserted, =
the Echo Reply messages can<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; be caused to transit another AS unrelated =
to the LSP under test. Since<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; the Echo Reply reveals path information =
about the LSP, this is a<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; valuable attack.&nbsp; Having said that, =
you can say how this TLV is <o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;&gt; protected in the Echo Reply =
message.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt;<o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt; [Lizhong] Do you mean the new TLV could be used =
to collect path information<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt; unrelated to the LSP under test? This is not =
true. Only the node along the<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>LSP&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt; will add path information into the new TLV. The =
relay node in the new TLV<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt; will only relay the Echo Reply to the =
initiator, and will not add =
information<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>to<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&gt; the new TLV.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>I think you misunderstand how security attacks might =
work. Suppose I am able to<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>do one of two =
things:<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>1. Modify the control plane code on a router that =
adds or processes a<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;&nbsp;&nbsp; Relay Node Address Stack TLV so =
that it adds a bogus entry to the<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;&nbsp;&nbsp;&nbsp; TLV. The prospect of =
modifications to control plane code is =
generally<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;&nbsp;&nbsp;&nbsp; considered to be so =
disastrous that it is just noted without any =
<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;&nbsp;&nbsp;&nbsp; further precautions (after =
all, if you can get at the control =
plane<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;&nbsp;&nbsp;&nbsp; code, you can make the =
routers do anything).<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>2. Intercept and modify a packet in transit. This is =
the main risk I am <o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;&nbsp;&nbsp; talking =
about.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>[Lizhong] If one router's control plane in the =
network is&nbsp;<span style=3D'background:white'>hijacked,&nbsp;it could =
send any&nbsp;</span><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black;background:white'>information to the third party. It =
is a general problem. But I understand you concern.</span><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black;background:white'>I will add the following to try to =
mitigate your concern.</span><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black;background:white'>The&nbsp;Relay Node Address Stack =
TLV has the path information of the LSP, and&nbsp;</span><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black;background:white'>such information may be maliciously =
used by any uncontrolled LSR/LER. We have</span><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black;background:white'>two ways to reduce the path =
information in the TLV:</span><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black;background:white'>1. it is recommended to clear the K =
bit in the relay address entry unless you have to.</span><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black;background:white'>2. it is encouraged to =
use&nbsp;</span><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>NIL address entry to hide node information if =
possible.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black;background:white'>&nbsp;</span><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>Cheers,<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>Adrian<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;mso-fareast-font-family:"Times New =
Roman";color:black'>&nbsp;<o:p></o:p></span></p></div></div></blockquote>=
</div></div></body></html>
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From nobody Tue Jun 30 04:36:07 2015
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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'George Swallow \(swallow\)'" <swallow@cisco.com>, <lizho.jin@gmail.com>,  "'loa'" <loa@pi.nu>, "'mpls'" <mpls@ietf.org>, "'mpls-chairs'" <mpls-chairs@tools.ietf.org>, "'draft-ietf-mpls-lsp-ping-relay-reply'" <draft-ietf-mpls-lsp-ping-relay-reply@tools.ietf.org>,  "'db3546'" <db3546@att.com>
References: <0cc101d0a92b$58745050$095cf0f0$@olddog.co.uk> <D1AEF47A.3B610%swallow@cisco.com>
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Date: Tue, 30 Jun 2015 12:35:42 +0100
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Subject: Re: [mpls] MPLS working group last call on draft-ietf-mpls-lsp-ping-relay-reply
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Thanks George,

[snip]

> >>> I tried to work out how things would pan out if two ASes on the path
> >>> used the same address space within their AS. Would an address appear in
> >>> the stack and seem to be routable when it is really an address in the
> >>> other AS?
> >> [Lizhong] we have an example in section 5. And address of P1 and P2
> >> could be same. In that case, ASBR1 must add its interface address
> >> facing ASBR2 with the K bit set. Then relay reply will not be miss-routed.
> >
> >Ah, I get it.
> >But this relies on ASBT1 setting the K bit.
> >So I suspect this needs to not be a special case: you need to require
> >that the domain boundary always sets the K bit.
> 
> GS>  I made such a change awhile back.  It got shot down on the list.
> There was push back due to the requirement for topological awareness
> within the LSP Ping module.
> 
> Adrian - If you want to try pushing back on that, would you send a message
> to the list on just this topic and see if we can convince folks.

Consider this to be the push-back! :-)

It seems that the domain boundary (probably just an ASBR?) either has to know
that some other domain in the path is using the same address space as it is
using, or it has to know that it is an ASBR. Without applying the K bit for one
of these criteria, the mechanism is broken.

I suggest that the former is hard to know, but the latter is easy and can be
injected into the "LSP Ping module". This is NOT topological awareness since it
does not do harm to have extra K bits set, so in the relatively rare case of an
ASBR being on the path of an LSP that does not actually exit the AS, no harm
will be done.

The authors may want to ask the chairs how they establish whether there is WG
agreement on this point.

Cheers,
Adrian


From nobody Tue Jun 30 08:56:28 2015
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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'Loa Andersson'" <loa@pi.nu>, <mpls@ietf.org>
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Cc: draft-ietf-mpls-self-ping@tools.ietf.org, mpls-chairs@tools.ietf.org
Subject: Re: [mpls] MPLS working group last call on draft-ietf-mpls-self-ping
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Hi Loa,

I reviewed this document at WG adoption and made a few comments. The authors
have resolved them in this version and I think the document is good to go.

Cheers,
Adrian

> -----Original Message-----
> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson
> Sent: 28 June 2015 11:00
> To: mpls@ietf.org
> Cc: draft-ietf-mpls-self-ping@tools.ietf.org; mpls-chairs@tools.ietf.org
> Subject: [mpls] MPLS working group last call on draft-ietf-mpls-self-ping
> 
> Working Group,
> 
> This is to initiate a two week working group last call on
> draft-ietf-mpls-self-ping.
> 
> Please send your comments to the mpls wg mailing list (mpls@ietf.org).
> 
> An IPR poll has been started in parallel to the wglc.
> 
> 
> This working group last call ends July 13, 2015.
> 
> 
> /Loa
> for the MPLS wg chairs
> 
> --
> 
> 
> 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

