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From: Alexander Okonnikov <alexander.okonnikov@gmail.com>
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Date: Mon, 1 Oct 2018 11:29:13 +0300
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Cc: IETF MPLS List <mpls@ietf.org>
To: Vishnu Pavan Beeram <vishnupavan@gmail.com>
References: <CA+YzgTskvvzq6n=v156C8hB1=Yws--7nRFbNpUbUTSgWzhh9cw@mail.gmail.com> <211770d4-8279-33e2-b6bf-289261b6f6ff@gmail.com> <CA+YzgTt6qPhk83gjf+yG7zYVuDnTiUf=SMYJ3VYvKxqaWSHdQg@mail.gmail.com> <D06589AC-990F-4D31-8E68-098D4603CCD7@gmail.com> <5437736B-6E12-4595-A333-367AB7232692@gmail.com> <CA+YzgTt4XRQKpAmxk50cLTfAfOmt_csX9Q-zrddsn70cAdyQXA@mail.gmail.com> <EF52917C-814E-4107-9035-F4E6A36A9BB2@gmail.com> <CA+YzgTvuFj7xaB3NJ+HRQ7MAB2xNHFsSqkTEM9zV0ego0sDj=w@mail.gmail.com> <790008AA-4DB9-4FBD-AFCB-BC4FC75D4D4C@gmail.com> <CA+YzgTv9c-8z0=dJ0LNv7dsdGGUq+h+R5v43wSWbuUqz1bZKCw@mail.gmail.com>
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Subject: Re: [mpls] Requesting WG LC for draft-ietf-mpls-rsvp-shared-labels
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Hi Pavan,

The text proposed assumes that both kinds of bypass tunnels - regular =
and segment-routed - can be used. But, if segment-routed one is used, it =
can cause re-election of delegation hops and re-signaling protected LSP. =
For example, when segment-routed bypass tunnel has been rerouted, and =
its path length has been changed, ETLD value will be modified.

Hence, I think that description should be more precise - which kinds of =
bypass tunnel are allowed for different kinds of segment-routed LSPs =
(w/o delegation hops, w/ explicit/automatic delegation hops), and what =
are procedures for using them.

Thank you.

> 27 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 10:44, Vishnu Pavan =
Beeram <vishnupavan@gmail.com> =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=
=D0=B0):
>=20
> Alexander, Hi!
> =20
> As you have observed, the draft doesn=E2=80=99t preclude the use of =
shared labels for bypass tunnels (when there is such a desire to do so). =
The intent of the text in Section 5.3.1 (that you have highlighted) is =
to simply say that the ETLD processing at the ingress/delegation-hop =
MUST account for the bypass tunnel=E2=80=99s label(s). The following =
update to the text should address your concern:
> =20
>    When an LSP that requests automatic delegation also requests =
facility
>    backup protection [RFC4090 <https://tools.ietf.org/html/rfc4090>], =
the ingress or the delegation hop MUST
>    account for the bypass tunnel's label(s) when populating the ETLD.  =
Hence,
>    when a regular bypass tunnel is used to protect the facility, the =
ETLD
>    that gets populated on these nodes is one less than what gets =
populated
>    for a corresponding unprotected LSP.
> =20
> Regards,
> -Pavan
>=20
> On Wed, Sep 26, 2018 at 10:44 AM Alexander Okonnikov =
<alexander.okonnikov@gmail.com <mailto:alexander.okonnikov@gmail.com>> =
wrote:
> Hi Pavan,
>=20
> The fact that facility bypass LSP is being established according to =
RFC 4090 doesn't necessary mean that it itself cannot be shared segment =
RSVP-TE LSP. One can assume that the same approach is used for bypass =
tunnels too (to take benefits of shared segment approach). And it could =
be, unless automatic delegation is used for some protected LSP.
>=20
> Thank you.
>=20
>> 26 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 17:20, Vishnu Pavan =
Beeram <vishnupavan@gmail.com <mailto:vishnupavan@gmail.com>> =
=D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):
>>=20
>> Alex, Hi!
>>=20
>> Yes, the bypass tunnel (as indicated by the reference) referred to =
here is a regular RFC4090 bypass tunnel.
>>=20
>> Regards,
>> -Pavan
>>=20
>> On Tue, Sep 25, 2018 at 11:43 AM Alexander Okonnikov =
<alexander.okonnikov@gmail.com <mailto:alexander.okonnikov@gmail.com>> =
wrote:
>> Hi Pavan,
>>=20
>> One question regarding ETLD. The draft says (section 5.3.1):
>>=20
>>    When an LSP that requests automatic delegation also requests =
facility
>>    backup protection [RFC4090 <https://tools.ietf.org/html/rfc4090>], =
the ingress or the delegation hop MUST
>>    account for the bypass tunnel's label when populating the ETLD.  =
So,
>>    the ETLD that gets populated on these nodes is one less than what
>>    gets populated for a corresponding unprotected LSP.
>>=20
>> I.e. is it assumed that bypass tunnel itself will be regular RSVP-TE =
LSP? Otherwise, if bypass LSP is signalled using shared labels approach, =
ETLD should be decreased for amount of label stack depth, imposed by =
this PLR (ingress or delegation hop) for bypass tunnel.
>>=20
>> Thank you.
>>=20
>>> 16 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 3:03, Vishnu Pavan =
Beeram <vishnupavan@gmail.com <mailto:vishnupavan@gmail.com>> =
=D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):
>>>=20
>>> Alexander, Hi!
>>> =20
>>> Much Thanks for the review comments. Please keep them coming.
>>> Please see inline for responses (prefixed VPB).
>>> =20
>>> Regards,
>>> -Pavan
>>>=20
>>>=20
>>> On Thu, Sep 13, 2018 at 1:28 PM Alexander Okonnikov =
<alexander.okonnikov@gmail.com <mailto:alexander.okonnikov@gmail.com>> =
wrote:
>>> Hi Panav,
>>>=20
>>> Questions regarding ETLD:
>>>=20
>>> The draft is not clear about signaling of ETLD attribute. It says =
that ETLD is conveyed as per-hop attribute. Is my understanding correct =
that it is conveyed as RRO Hop attribute? Probably it could be cleaned =
to avoid confusion whether ERO or RRO Hop attribute mechanism is used.
>>>=20
>>> [VPB] The ETLD specific protocol extensions are discussed in Section =
9.7. This section clearly states that the ETLD TLV is carried in the =
HOP_ATTRIBUTES subobject of an RRO object in the Path message. That =
said, the following tweak to the text in Section 5.3.1 should address =
your comment:
>>> =20
>>> OLD:
>>> The ETLD is signaled as a per-hop attribute in the Path message =
[RFC7570 <https://tools.ietf.org/html/rfc7570>].
>>> =20
>>> NEW:
>>> The ETLD is signaled as a per-hop recorded attribute in the Path =
message [RFC7570 <https://tools.ietf.org/html/rfc7570>].
>>> =20
>>>  =20
>>>=20
>>> Next, the draft says that:
>>>=20
>>> 	"... If a node is reached where the ETLD set from the previous =
hop is 1, then that
>>> 	node MUST select itself as the delegation hop.  If a node is =
reached and it is=20
>>> 	determined that this hop cannot receive more than one transport =
label, then that node=20
>>> 	MUST select itself as the delegation hop. ..."
>>>=20
>>> What is purpose of the second sentence/rule?
>>>=20
>>> [VPB] Selecting oneself as a delegation hop ensures that the =
incoming packet will not carry more than one transport label. The second =
sentence above was added to let the transit node have the ability to =
influence the delegation decision if it ran into some local =
policy/limitation that prevented it from receiving more than one =
transport label. As an alternative, the transit node may decide to =
choose a regular swap label in such scenarios and let some downstream =
node be the delegation hop.
>>>  =20
>>>=20
>>> Next:
>>>=20
>>> 	"If there is a node or a sequence of nodes along the path of the =
LSP that do not=20
>>> 	support ETLD, then the immediate hop that supports ETLD MUST =
select itself as the=20
>>> 	delegation hop."
>>>=20
>>> If some node (consecutive nodes) doesn't support ETLD then it =
doesn't support TE labels. Hence, that node (regular RSVP-TE LSR) will =
do SWAP and not POP. As a result non-decremented ETLD is OK and =
immediate hop that supports ETLD not necessary should become delegation =
hop?
>>>=20
>>>=20
>>> [VPB] If an intermediate transit node doesn=E2=80=99t support ETLD, =
it will not record ETLD for that hop. The immediate hop that supports =
ETLD will realize that the previous hop doesn=E2=80=99t support ETLD (no =
recording available for the previous hop) and designates itself as a =
delegation hop.
>>> =20
>>> Also, from Section 9.7:
>>>=20
>>> "The ETLD field specifies the maximum number of transport labels =
that this hop can potentially send to its downstream hop.  It MUST be =
set to a non-zero value."
>>>=20
>>> Strictly speaking it is not correct. ETLD reflects decrementing =
counter and not capability of some transit node. I.e. if we consider LSP =
R1-R2-R3, R1 puts value 5 in ETLD,and R2 supports imposing of 2 labels, =
it doesn't mean that R2 should rewrite ETLD with value 2. It just should =
decrement value 5. Correct?
>>>=20
>>>=20
>>> [VPB] I agree that the above sentence can read better. The intent =
was to say =E2=80=93 =E2=80=9Cthe maximum number of transport labels =
that the hop can send in relation to its position in the path=E2=80=9D. =
The following tweak to the sentence should address your concern:
>>> =20
>>> OLD:
>>> The ETLD field specifies the maximum number of transport labels that =
this hop can potentially send to its downstream hop.
>>> =20
>>> NEW:
>>> The ETLD field specifies the effective number of transport labels =
that this hop (in relation to its position in the path) can potentially =
send to its downstream hop.
>>> =20
>>>  =20
>>> Also, per my understanding it is supposed that in fact ETLD value =
will not be just decremented, but it will be copied from previous RRO =
Hop attributes subobject into being inserted RRO Hop attributes =
subobject with decrementing. May be it would be better to signal ETLD =
value in LSP Attributes object (and each capable node decrements ETLD =
value there), while signaling support of ETLD itself in RRO Hop =
attributes subobject?
>>>=20
>>>=20
>>> [VPB] The authors did consider the alternative protocol extensions =
that you have specified above. We decided to use the current encoding in =
the draft because there was no good reason to get 2 code-points for ETLD =
when the same objective could be achieved with one code-point.
>>> =20
>>> Thank you.
>>>=20
>>>> 13 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 20:22, Alexander =
Okonnikov <alexander.okonnikov@gmail.com =
<mailto:alexander.okonnikov@gmail.com>> =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=
=D0=BB(=D0=B0):
>>>>=20
>>>> Hi Pavan,
>>>>=20
>>>> I'm sorry for delay with answer.
>>>>=20
>>>> If ingress uses regular Path MTU discovery mechanism, it could =
produce value of MTU lower than actual one. This is because ingress =
doesn't know MTU per each hop. Let's consider case with four routers: R1 =
- R2 - R3 - R4. MTU for R1-R2 link is 2000, MTU for R2-R3 is 1600 and =
MTU for R3-R4 is 2000. By virtue of regular Path MTU discovery mechanism =
R1 will derive from FLOWSPEC that path MTU is 1600. As soon as R1 =
doesn't know how many labels in the stack will be on the lowest MTU hop, =
it can only set LSP MTU to most conservative value (1600 - 4 - 4 =3D =
1592, provided that R4 has advertised implicit null label). In fact =
actual path MTU is 1596 (1600 - 4 on R2-R3 hop). Of course, it could be =
acceptable, but calculated LSP MTU as more lower than actual as longer =
LSP path. For correct path MTU discovery ingress needs to know MTU per =
each hop.
>>>>=20
>>>> Thank you.
>>>>=20
>>>>> 6 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 18:27, Vishnu =
Pavan Beeram <vishnupavan@gmail.com <mailto:vishnupavan@gmail.com>> =
=D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):
>>>>>=20
>>>>> Alexander, Hi!
>>>>> =20
>>>>> I apologize for the delayed response.
>>>>> =20
>>>>> This draft does not propose any changes to the standard RSVP MTU =
signaling procedures (Int Serv object specific signaling procedures). =
After the initial signaling sequence is complete, an ingress =
implementation (RFC3209) would typically take the path MTU learnt via =
signaling, run it through some local logic and then arrive at an MTU =
value that can be assigned to the LSP. This local logic typically =
involves deducting the number of bytes in the label stack used for the =
LSP from the path MTU learnt via signaling. The ingress implementation =
supporting this draft will rely on the Resv RRO to accurately determine =
the max-number of labels pushed along the path of the LSP (note that =
with delegation, downstream hops can impose label stacks) and account =
for it in the local logic used to arrive at the MTU value assigned to =
the LSP.
>>>>> =20
>>>>> I hope this addresses your question.
>>>>> =20
>>>>> Regards,
>>>>> -Pavan
>>>>>=20
>>>>> On Tue, Aug 7, 2018 at 12:22 PM Alexander Okonnikov =
<alexander.okonnikov@gmail.com <mailto:alexander.okonnikov@gmail.com>> =
wrote:
>>>>> Hi Pavan,
>>>>>=20
>>>>>=20
>>>>> Regular RSVP-TE LSPs use standard RSVP path MTU discovery =
mechanism. That one cannot be used "as is" for approach described in the =
draft, and the draft doesn't address path MTU identification. Is it to =
be considered?
>>>>>=20
>>>>> Thank you.
>>>>>=20
>>>>> 26.07.2018 06:07, Vishnu Pavan Beeram =D0=BF=D0=B8=D1=88=D0=B5=D1=82=
:
>>>>>> Chairs, Hi!
>>>>>>=20
>>>>>> As mentioned (in our presentation) in last week's WG session, we =
believe that the draft is sufficiently baked and ready to progress to =
the next stage. We would like to formally request this draft to be =
considered for WG LC.
>>>>>>=20
>>>>>> Regards,
>>>>>> - Pavan (on behalf of the authors)
>>>>>>=20
>>>>>>=20
>>>>>> _______________________________________________
>>>>>> mpls mailing list
>>>>>> mpls@ietf.org <mailto:mpls@ietf.org>
>>>>>> https://www.ietf.org/mailman/listinfo/mpls =
<https://www.ietf.org/mailman/listinfo/mpls>
>>>>>=20
>>>>> _______________________________________________
>>>>> mpls mailing list
>>>>> mpls@ietf.org <mailto:mpls@ietf.org>
>>>>> https://www.ietf.org/mailman/listinfo/mpls =
<https://www.ietf.org/mailman/listinfo/mpls>
>>>>=20
>>>=20
>>=20
>=20


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><div =
class=3D"">Hi Pavan,</div><div class=3D""><br class=3D""></div><div =
class=3D"">The text proposed assumes that both kinds of bypass tunnels - =
regular and segment-routed - can be used. But, if segment-routed one is =
used, it can cause re-election of delegation hops and re-signaling =
protected LSP. For example, when segment-routed bypass tunnel has been =
rerouted, and its path length has been changed, ETLD value will be =
modified.</div><div class=3D""><br class=3D""></div><div class=3D"">Hence,=
 I think that description should be more precise - which kinds of bypass =
tunnel are allowed for different kinds of segment-routed LSPs (w/o =
delegation hops, w/ explicit/automatic delegation hops), and what are =
procedures for using them.</div><div class=3D""><br class=3D""></div><div =
class=3D"">Thank you.</div><div><br class=3D""><blockquote type=3D"cite" =
class=3D""><div class=3D"">27 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2=
 10:44, Vishnu Pavan Beeram &lt;<a href=3D"mailto:vishnupavan@gmail.com" =
class=3D"">vishnupavan@gmail.com</a>&gt; =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=
=B0=D0=BB(=D0=B0):</div><br class=3D"Apple-interchange-newline"><div =
class=3D""><div dir=3D"ltr" class=3D""><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span class=3D"">Alexander,
Hi!<span class=3D""></span></span></div><p class=3D"MsoNormal" =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span =
class=3D""><span class=3D"">&nbsp;</span></span></p><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span class=3D"">As you
have observed, the draft doesn=E2=80=99t preclude the use of shared =
labels for bypass
tunnels (when there is such a desire to do so). The intent of the text =
in Section
5.3.1 (that you have highlighted) is to simply say that the ETLD =
processing at
the ingress/delegation-hop MUST account for the bypass tunnel=E2=80=99s =
label(s). The
following update to the text should address your concern:<span =
class=3D""></span></span></div><p class=3D"MsoNormal" style=3D"margin:0in =
0in =
0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span =
class=3D""><span class=3D"">&nbsp;</span></span></p><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-size:10pt;font-family:&quot;Courier =
New&quot;" class=3D""><span class=3D"">&nbsp;&nbsp; </span>When an LSP =
that requests automatic
delegation also requests facility<span class=3D""></span></span></div><div=
 style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><span =
style=3D"font-size:10pt;font-family:&quot;Courier New&quot;" =
class=3D""><span class=3D"">&nbsp;&nbsp; </span>backup protection [<a =
href=3D"https://tools.ietf.org/html/rfc4090" title=3D"&quot;Fast Reroute =
Extensions to RSVP-TE for LSP Tunnels&quot;" class=3D""><span =
style=3D"color:blue" class=3D"">RFC4090</span></a>], the ingress or the =
delegation hop MUST<span class=3D""></span></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><span =
style=3D"font-size:10pt;font-family:&quot;Courier New&quot;" =
class=3D""><span class=3D"">&nbsp;&nbsp; </span>account for the bypass =
tunnel's label(s)
when populating the ETLD.<span class=3D"">&nbsp; </span>Hence,<span =
class=3D""></span></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
style=3D"font-size:10pt;font-family:&quot;Courier New&quot;" =
class=3D""><span class=3D"">&nbsp;&nbsp; </span>when a regular bypass =
tunnel is used to
protect the facility, the ETLD <span class=3D""></span></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><span =
style=3D"font-size:10pt;font-family:&quot;Courier New&quot;" =
class=3D""><span class=3D"">&nbsp;&nbsp; </span>that gets populated on =
these nodes is one
less than what gets populated <span class=3D""></span></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><span =
style=3D"font-size:10pt;font-family:&quot;Courier New&quot;" =
class=3D""><span class=3D"">&nbsp;&nbsp; </span>for a corresponding =
unprotected LSP.<span class=3D""></span></span></div><p =
class=3D"MsoNormal" style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span =
class=3D""><span class=3D"">&nbsp;</span></span></p><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span class=3D"">Regards,<span =
class=3D""></span></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
class=3D"">-Pavan<span class=3D""></span></span></div>





</div><br class=3D""><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"">On Wed, Sep 26, 2018 at 10:44 AM Alexander Okonnikov &lt;<a =
href=3D"mailto:alexander.okonnikov@gmail.com" =
class=3D"">alexander.okonnikov@gmail.com</a>&gt; wrote:<br =
class=3D""></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 =
.8ex;border-left:1px #ccc solid;padding-left:1ex"><div =
style=3D"word-wrap:break-word;line-break:after-white-space" class=3D"">Hi =
Pavan,<div class=3D""><br class=3D""></div><div class=3D"">The fact that =
facility bypass LSP is being established according to RFC 4090 doesn't =
necessary mean that it itself cannot be shared segment RSVP-TE LSP. One =
can assume that the same approach is used for bypass tunnels too (to =
take benefits of shared segment approach). And it could be, unless =
automatic delegation is used for some protected LSP.</div><div =
class=3D""><br class=3D""></div><div class=3D"">Thank you.<br =
class=3D""><div class=3D""><br class=3D""><blockquote type=3D"cite" =
class=3D""><div class=3D"">26 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2=
 17:20, Vishnu Pavan Beeram &lt;<a href=3D"mailto:vishnupavan@gmail.com" =
target=3D"_blank" class=3D"">vishnupavan@gmail.com</a>&gt; =
=D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):</div><br =
class=3D"m_8165476047265226579Apple-interchange-newline"><div =
class=3D""><div dir=3D"ltr" class=3D""><div dir=3D"ltr" class=3D""><div =
class=3D"">Alex, Hi!</div><div class=3D""><br class=3D""></div><div =
class=3D"">Yes, the bypass tunnel (as indicated by the reference) =
referred to here is a regular RFC4090 bypass tunnel.</div><div =
class=3D""><br class=3D""></div><div class=3D"">Regards,</div><div =
class=3D"">-Pavan<br class=3D""></div><div class=3D""><br class=3D""><div =
class=3D"gmail_quote"><div dir=3D"ltr" class=3D"">On Tue, Sep 25, 2018 =
at 11:43 AM Alexander Okonnikov &lt;<a =
href=3D"mailto:alexander.okonnikov@gmail.com" target=3D"_blank" =
class=3D"">alexander.okonnikov@gmail.com</a>&gt; wrote:<br =
class=3D""></div><blockquote class=3D"gmail_quote" style=3D"margin:0px =
0px 0px 0.8ex;border-left:1px solid =
rgb(204,204,204);padding-left:1ex"><div class=3D"">Hi Pavan,<div =
class=3D""><br class=3D""></div><div class=3D"">One question regarding =
ETLD. The draft says (section 5.3.1):</div><div class=3D""><br =
class=3D""></div><div class=3D""><pre =
class=3D"m_8165476047265226579gmail-m_-4583328448852969928newpage" =
style=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px">   When =
an LSP that requests automatic delegation also requests facility
   backup protection [<a href=3D"https://tools.ietf.org/html/rfc4090" =
title=3D"&quot;Fast Reroute Extensions to RSVP-TE for LSP Tunnels&quot;" =
target=3D"_blank" class=3D"">RFC4090</a>], the ingress or the delegation =
hop MUST
   account for the bypass tunnel's label when populating the ETLD.  So,
   the ETLD that gets populated on these nodes is one less than what
   gets populated for a corresponding unprotected LSP.</pre><div =
class=3D""><br class=3D""></div><div class=3D"">I.e. is it assumed that =
bypass tunnel itself will be regular RSVP-TE LSP? Otherwise, if bypass =
LSP is signalled using shared labels approach, ETLD should be decreased =
for amount of label stack depth, imposed by this PLR (ingress or =
delegation hop) for bypass tunnel.</div><div class=3D""><br =
class=3D""></div><div class=3D"">Thank you.</div><div class=3D""><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D"">16 =
=D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 3:03, Vishnu Pavan Beeram =
&lt;<a href=3D"mailto:vishnupavan@gmail.com" target=3D"_blank" =
class=3D"">vishnupavan@gmail.com</a>&gt; =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=
=B0=D0=BB(=D0=B0):</div><br =
class=3D"m_8165476047265226579gmail-m_-4583328448852969928Apple-interchang=
e-newline"><div class=3D""><div dir=3D"ltr" class=3D""><div =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
class=3D"">Alexander,
Hi!<span class=3D""></span></span></div><p class=3D"MsoNormal" =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span =
class=3D""><span class=3D"">&nbsp;</span></span></p><div =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
class=3D"">Much
Thanks for the review comments. Please keep them coming.<span =
class=3D""></span></span></div><div style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
class=3D"">Please
see inline for responses (prefixed VPB).<span =
class=3D""></span></span></div><p class=3D"MsoNormal" style=3D"margin:0in =
0in =
0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span =
class=3D""><span class=3D"">&nbsp;</span></span></p><div =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
class=3D"">Regards,<span class=3D""></span></span></div><div =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
class=3D"">-Pavan<span class=3D""></span></span></div>





<br class=3D""><span style=3D"font-size:10pt;font-family:&quot;Courier =
New&quot;" class=3D""><span class=3D""></span></span>





<br class=3D""><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"">On =
Thu, Sep 13, 2018 at 1:28 PM Alexander Okonnikov &lt;<a =
href=3D"mailto:alexander.okonnikov@gmail.com" target=3D"_blank" =
class=3D"">alexander.okonnikov@gmail.com</a>&gt; wrote:<br =
class=3D""></div><blockquote class=3D"gmail_quote" style=3D"margin:0px =
0px 0px 0.8ex;border-left:1px solid =
rgb(204,204,204);padding-left:1ex"><div class=3D"">Hi Panav,<div =
class=3D""><br class=3D""></div><div class=3D""><div class=3D"">Questions =
regarding ETLD:</div><div class=3D""><br class=3D""></div><div =
class=3D"">The draft is not clear about signaling of ETLD attribute. It =
says that ETLD is conveyed as per-hop attribute. Is my understanding =
correct that it is conveyed as RRO Hop attribute? Probably it could be =
cleaned to avoid confusion whether ERO or RRO Hop attribute mechanism is =
used.</div></div></div></blockquote><div class=3D""><br =
class=3D""></div><div class=3D""><div style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
class=3D"">[VPB] The
ETLD specific protocol extensions are discussed in Section 9.7. This =
section
clearly states that the ETLD TLV is carried in the HOP_ATTRIBUTES =
subobject of
an RRO object in the Path message. That said, the following tweak to the =
text
in Section 5.3.1 should address your comment:<span =
class=3D""></span></span></div><p class=3D"MsoNormal" style=3D"margin:0in =
0in =
0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span =
class=3D""><span class=3D"">&nbsp;</span></span></p><div =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
class=3D"">OLD:<span class=3D""></span></span></div><div =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
style=3D"font-size:10pt;font-family:&quot;Courier New&quot;" =
class=3D"">The
ETLD is signaled as a per-hop attribute in the Path message [<a =
href=3D"https://tools.ietf.org/html/rfc7570" title=3D"&quot;Label =
Switched Path (LSP) Attribute in the Explicit Route Object (ERO)&quot;" =
target=3D"_blank" class=3D""><span style=3D"color:blue" =
class=3D"">RFC7570</span></a>].<span class=3D""></span></span></div><p =
class=3D"MsoNormal" style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span =
style=3D"font-size:10pt;font-family:&quot;Courier New&quot;" =
class=3D""><span class=3D"">&nbsp;</span></span></p><div =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
class=3D"">NEW:<span class=3D""></span></span></div><div =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
style=3D"font-size:10pt;font-family:&quot;Courier New&quot;" =
class=3D"">The
ETLD is signaled as a per-hop recorded attribute in the Path message [<a =
href=3D"https://tools.ietf.org/html/rfc7570" title=3D"&quot;Label =
Switched Path (LSP) Attribute in the Explicit Route Object (ERO)&quot;" =
target=3D"_blank" class=3D""><span style=3D"color:blue" =
class=3D"">RFC7570</span></a>].<span class=3D""></span></span></div><p =
class=3D"MsoNormal" style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span =
class=3D""><span class=3D"">&nbsp;</span></span></p>&nbsp;





<br class=3D""></div><blockquote class=3D"gmail_quote" style=3D"margin:0px=
 0px 0px 0.8ex;border-left:1px solid =
rgb(204,204,204);padding-left:1ex"><div class=3D""><div class=3D""><div =
class=3D""><br class=3D""></div><div class=3D"">Next, the draft says =
that:</div><div class=3D""><br class=3D""></div><div class=3D""><span =
class=3D"m_8165476047265226579gmail-m_-4583328448852969928m_-3476666688711=
270356Apple-tab-span" style=3D"white-space:pre-wrap">	</span>"... If a =
node is reached where the ETLD set from the previous hop is 1, then =
that</div><div class=3D""><span =
class=3D"m_8165476047265226579gmail-m_-4583328448852969928m_-3476666688711=
270356Apple-tab-span" style=3D"white-space:pre-wrap">	</span>node MUST =
select itself as the delegation hop.&nbsp; If a node is reached and it =
is&nbsp;</div><div class=3D""><span =
class=3D"m_8165476047265226579gmail-m_-4583328448852969928m_-3476666688711=
270356Apple-tab-span" style=3D"white-space:pre-wrap">	=
</span>determined that this hop cannot receive more than one transport =
label, then that node&nbsp;</div><div class=3D""><span =
class=3D"m_8165476047265226579gmail-m_-4583328448852969928m_-3476666688711=
270356Apple-tab-span" style=3D"white-space:pre-wrap">	</span>MUST =
select itself as the delegation hop. ..."</div><div class=3D""><br =
class=3D""></div><div class=3D"">What is purpose of the second =
sentence/rule?</div></div></div></blockquote><div class=3D""><br =
class=3D""></div><div class=3D""><div style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
class=3D"">[VPB] Selecting
oneself as a delegation hop ensures that the incoming packet will not =
carry more
than one transport label. The second sentence above was added to let
the transit node have the ability to influence the delegation decision =
if it
ran into some local policy/limitation that prevented it from receiving =
more
than one transport label. As an alternative, the transit node may decide =
to choose
a regular swap label in such scenarios and let some downstream node be =
the delegation
hop.<span class=3D""></span></span></div>&nbsp;





<br class=3D""></div><blockquote class=3D"gmail_quote" style=3D"margin:0px=
 0px 0px 0.8ex;border-left:1px solid =
rgb(204,204,204);padding-left:1ex"><div class=3D""><div class=3D""><div =
class=3D""><br class=3D""></div><div class=3D"">Next:</div><div =
class=3D""><br class=3D""></div><div class=3D""><span =
class=3D"m_8165476047265226579gmail-m_-4583328448852969928m_-3476666688711=
270356Apple-tab-span" style=3D"white-space:pre-wrap">	</span>"If there =
is a node or a sequence of nodes along the path of the LSP that do =
not&nbsp;</div><div class=3D""><span =
class=3D"m_8165476047265226579gmail-m_-4583328448852969928m_-3476666688711=
270356Apple-tab-span" style=3D"white-space:pre-wrap">	</span>support =
ETLD, then the immediate hop that supports ETLD MUST select itself as =
the&nbsp;</div><div class=3D""><span =
class=3D"m_8165476047265226579gmail-m_-4583328448852969928m_-3476666688711=
270356Apple-tab-span" style=3D"white-space:pre-wrap">	=
</span>delegation hop."</div><div class=3D""><br class=3D""></div><div =
class=3D"">If some node (consecutive nodes) doesn't support ETLD then it =
doesn't support TE labels. Hence, that node (regular RSVP-TE LSR) will =
do SWAP and not POP. As a result non-decremented ETLD is OK and =
immediate hop that supports ETLD not necessary should become delegation =
hop?</div><div class=3D""><br =
class=3D""></div></div></div></blockquote><div class=3D""><br =
class=3D""></div><div class=3D""><div style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
class=3D"">[VPB] If
an intermediate transit node doesn=E2=80=99t support ETLD, it will not =
record ETLD for
that hop. The immediate hop that supports ETLD will realize that the =
previous
hop doesn=E2=80=99t support ETLD (no recording available for the =
previous hop) and designates itself as a
delegation hop.<span class=3D""></span></span></div>

</div><div class=3D"">&nbsp;</div><blockquote class=3D"gmail_quote" =
style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid =
rgb(204,204,204);padding-left:1ex"><div class=3D""><div class=3D""><div =
class=3D""></div><div class=3D"">Also, from Section 9.7:</div><div =
class=3D""><br class=3D""></div><div class=3D"">"The ETLD field =
specifies the maximum number of transport labels that this hop can =
potentially send to its downstream hop.&nbsp; It MUST be set to a =
non-zero value."</div><div class=3D""><br class=3D""></div><div =
class=3D"">Strictly speaking it is not correct. ETLD reflects =
decrementing counter and not capability of some transit node. I.e. if we =
consider LSP R1-R2-R3, R1 puts value 5 in ETLD,and R2 supports imposing =
of 2 labels, it doesn't mean that R2 should rewrite ETLD with value 2. =
It just should decrement value 5. Correct?</div><div class=3D""><br =
class=3D""></div></div></div></blockquote><div class=3D""><br =
class=3D""></div><div class=3D""><div style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
class=3D"">[VPB] I
agree that the above sentence can read better. The intent was to say =E2=80=
=93 =E2=80=9Cthe maximum
number of transport labels that the hop can send in relation to its =
position in
the path=E2=80=9D. The following tweak to the sentence should address =
your concern:<span class=3D""></span></span></div><p class=3D"MsoNormal" =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span =
class=3D""><span class=3D"">&nbsp;</span></span></p><div =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
class=3D"">OLD:<span class=3D""></span></span></div><div =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
style=3D"font-size:10pt;font-family:&quot;Courier New&quot;" =
class=3D"">The
ETLD field specifies the maximum number of transport labels that this =
hop can
potentially send to its downstream hop.<span =
class=3D""></span></span></div><p class=3D"MsoNormal" style=3D"margin:0in =
0in =
0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span =
class=3D""><span class=3D"">&nbsp;</span></span></p><div =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
class=3D"">NEW:<span class=3D""></span></span></div><div =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
style=3D"font-size:10pt;font-family:&quot;Courier New&quot;" =
class=3D"">The
ETLD field specifies the effective number of transport labels that this =
hop (in
relation to its position in the path) can potentially send to its =
downstream
hop.<span class=3D""></span></span></div><p class=3D"MsoNormal" =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span =
class=3D""><span class=3D"">&nbsp;</span></span></p>&nbsp;





<br class=3D""></div><blockquote class=3D"gmail_quote" style=3D"margin:0px=
 0px 0px 0.8ex;border-left:1px solid =
rgb(204,204,204);padding-left:1ex"><div class=3D""><div class=3D""><div =
class=3D""></div><div class=3D"">Also, per my understanding it is =
supposed that in fact ETLD value will not be just decremented, but it =
will be copied from previous RRO Hop attributes subobject into being =
inserted RRO Hop attributes subobject with decrementing. May be it would =
be better to signal ETLD value in LSP Attributes object (and each =
capable node decrements ETLD value there), while signaling support of =
ETLD itself in RRO Hop attributes subobject?</div><div class=3D""><br =
class=3D""></div></div></div></blockquote><div class=3D""><br =
class=3D""></div><div class=3D""><div style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
class=3D"">[VPB] The
authors did consider the alternative protocol extensions that you have
specified above. We decided to use the current encoding in the draft =
because there was no
good reason to get 2 code-points for ETLD when the same objective could =
be
achieved with one code-point.<span class=3D""></span></span></div>

</div><div class=3D"">&nbsp;</div><blockquote class=3D"gmail_quote" =
style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid =
rgb(204,204,204);padding-left:1ex"><div class=3D""><div class=3D""><div =
class=3D""></div><div class=3D"">Thank you.</div><div class=3D""><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D"">13 =
=D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 20:22, Alexander =
Okonnikov &lt;<a href=3D"mailto:alexander.okonnikov@gmail.com" =
target=3D"_blank" class=3D"">alexander.okonnikov@gmail.com</a>&gt; =
=D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):</div><br =
class=3D"m_8165476047265226579gmail-m_-4583328448852969928m_-3476666688711=
270356Apple-interchange-newline"><div class=3D""><div class=3D""><div =
class=3D"">Hi Pavan,</div><div class=3D""><br class=3D""></div><div =
class=3D"">I'm sorry for delay with answer.</div><div class=3D""><br =
class=3D""></div><div class=3D"">If ingress uses regular Path MTU =
discovery mechanism, it could produce value of MTU lower than actual =
one. This is because ingress doesn't know MTU per each hop. Let's =
consider case with four routers: R1 - R2 - R3 - R4. MTU for R1-R2 link =
is 2000, MTU for R2-R3 is 1600 and MTU for R3-R4 is 2000. By virtue of =
regular Path MTU discovery mechanism R1 will derive from FLOWSPEC that =
path MTU is 1600. As soon as R1 doesn't know how many labels in the =
stack will be on the lowest MTU hop, it can only set LSP MTU to most =
conservative value (1600 - 4 - 4 =3D 1592, provided that R4 has =
advertised implicit null label). In fact actual path MTU is 1596 (1600 - =
4 on R2-R3 hop). Of course, it could be acceptable, but calculated LSP =
MTU as more lower than actual as longer LSP path. For correct path MTU =
discovery ingress needs to know MTU per each hop.</div><div class=3D""><br=
 class=3D""></div><div class=3D"">Thank you.</div><div class=3D""><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D"">6 =
=D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 18:27, Vishnu Pavan =
Beeram &lt;<a href=3D"mailto:vishnupavan@gmail.com" target=3D"_blank" =
class=3D"">vishnupavan@gmail.com</a>&gt; =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=
=B0=D0=BB(=D0=B0):</div><br =
class=3D"m_8165476047265226579gmail-m_-4583328448852969928m_-3476666688711=
270356Apple-interchange-newline"><div class=3D""><div dir=3D"ltr" =
class=3D""><div dir=3D"ltr" class=3D"">Alexander, Hi!<br =
class=3D"">&nbsp;<br class=3D"">I apologize for the delayed response.<br =
class=3D"">&nbsp;<br class=3D"">This draft does not propose any changes =
to the standard RSVP MTU signaling procedures (Int Serv object specific =
signaling procedures). After the initial signaling sequence is complete, =
an ingress implementation (RFC3209) would typically take the path MTU =
learnt via signaling, run it through some local logic and then arrive at =
an MTU value that can be assigned to the LSP. This local logic typically =
involves deducting the number of bytes in the label stack used for the =
LSP from the path MTU learnt via signaling. The ingress implementation =
supporting this draft will rely on the Resv RRO to accurately determine =
the max-number of labels pushed along the path of the LSP (note that =
with delegation, downstream hops can impose label stacks) and account =
for it in the local logic used to arrive at the MTU value assigned to =
the LSP.<br class=3D"">&nbsp;<br class=3D"">I hope this addresses your =
question.<br class=3D"">&nbsp;<br class=3D"">Regards,<br =
class=3D"">-Pavan<br class=3D""></div></div><br class=3D""><div =
class=3D"gmail_quote"><div dir=3D"ltr" class=3D"">On Tue, Aug 7, 2018 at =
12:22 PM Alexander Okonnikov &lt;<a =
href=3D"mailto:alexander.okonnikov@gmail.com" target=3D"_blank" =
class=3D"">alexander.okonnikov@gmail.com</a>&gt; wrote:<br =
class=3D""></div><blockquote class=3D"gmail_quote" style=3D"margin:0px =
0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
 =20
   =20
 =20
  <div bgcolor=3D"#FFFFFF" class=3D""><p class=3D"">Hi Pavan,</p><p =
class=3D""><br class=3D"">
    </p><p class=3D"">Regular RSVP-TE LSPs use standard RSVP path MTU =
discovery
      mechanism. That one cannot be used "as is" for approach described
      in the draft, and the draft doesn't address path MTU
      identification. Is it to be considered?<br class=3D"">
    </p><p class=3D""><br class=3D"">
    </p><p class=3D"">Thank you.<br class=3D"">
    </p>
    <br class=3D"">
    <div =
class=3D"m_8165476047265226579gmail-m_-4583328448852969928m_-3476666688711=
270356m_-6153622752759840168moz-cite-prefix">26.07.2018 06:07, Vishnu =
Pavan Beeram
      =D0=BF=D0=B8=D1=88=D0=B5=D1=82:<br class=3D"">
    </div>
    <blockquote type=3D"cite" class=3D"">
     =20
      <div dir=3D"ltr" class=3D"">
        <div class=3D"">Chairs, Hi!</div>
        <div class=3D""><br class=3D"">
        </div>
        <div class=3D"">As mentioned (in our presentation) in last =
week's WG
          session, we believe that the draft is sufficiently baked and
          ready to progress to the next stage. We would like to formally
          request this draft to be considered for WG LC.<br class=3D"">
        </div>
        <div class=3D""><br class=3D"">
        </div>
        <div class=3D"">Regards,</div>
        <div class=3D"">- Pavan (on behalf of the authors)<br class=3D"">
        </div>
      </div>
      <br class=3D"">
      <fieldset =
class=3D"m_8165476047265226579gmail-m_-4583328448852969928m_-3476666688711=
270356m_-6153622752759840168mimeAttachmentHeader"></fieldset>
      <br class=3D"">
      <pre class=3D"">_______________________________________________
mpls mailing list
<a =
class=3D"m_8165476047265226579gmail-m_-4583328448852969928m_-3476666688711=
270356m_-6153622752759840168moz-txt-link-abbreviated" =
href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a>
<a =
class=3D"m_8165476047265226579gmail-m_-4583328448852969928m_-3476666688711=
270356m_-6153622752759840168moz-txt-link-freetext" =
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</pre>
    </blockquote>
    <br class=3D"">
  </div>

_______________________________________________<br class=3D"">
mpls mailing list<br class=3D"">
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank" =
class=3D"">mpls@ietf.org</a><br class=3D"">
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target=3D"_blank" =
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</blockquote></div>
</div></blockquote></div><br class=3D""></div></div></blockquote></div><br=
 class=3D""></div></div></blockquote></div></div>
</div></blockquote></div><br =
class=3D""></div></div></blockquote></div></div></div></div>
</div></blockquote></div><br class=3D""></div></div></blockquote></div>
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Hi Pavan,

Maybe it would be better to take out FRR link-protection description =
from this draft to draft-chandra-mpls-rsvp-shared-labels-np. Like we =
have RFC 3209 and RFC 4090 that describe RSVP-TE LSP and FRR for RSVP-TE =
LSP, respectively.

Thank you.

> 27 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 17:47, Matt Hartley =
<mhartley.ietf@gmail.com> =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0=
):
>=20
> Pavan,
>=20
> OK. That's reasonable, but it might be worth adding a line to the =
draft to say so.
>=20
> Cheers
>=20
> Matt
>=20
> On Thu, Sep 27, 2018 at 4:30 AM Vishnu Pavan Beeram =
<vishnupavan@gmail.com <mailto:vishnupavan@gmail.com>> wrote:
> Matt, Hi!
> =20
> The purpose of this document is to provide a mechanism to bring up =
MPLS RSVP-TE LSPs on a shared forwarding plane. There is a set of key =
RSVP-TE features/functionalities specified in the Introduction Section =
that would continue to work with this forwarding plane (without needing =
any special extensions). The authors believe that a deployable solution =
can be implemented with this set of features/functionalities.
> =20
> If there are any other desirable features/functionalities (that are =
not specified as supported in this document) that can be supported on =
this forwarding plane by introducing a few protocol extensions, then =
those are expected to be discussed separately =
(draft-chandra-mpls-rsvp-shared-labels-np is an example of that).
> =20
> Regards,
> -Pavan
>=20
> On Wed, Sep 26, 2018 at 10:56 AM Matt Hartley <mhartley.ietf@gmail.com =
<mailto:mhartley.ietf@gmail.com>> wrote:
> Pavan,
>=20
> The problem with lists like this (in general) is that it's not clear =
what the status is for anything that isn't on the list, and most lists =
will probably manage to omit *something*. I think there's three =
reasonable options:
>=20
> 1. State unequivocally that everything works
> 2. List the functionalities that definitely don't work, and make it =
clear that everything else does
> 3. List the functionalities that definitely work, and explicitly make =
no guarantees about anything that isn't listed.
>=20
> It isn't really clear what you're trying to do here.
>=20
> Note that in this case option 1 isn't on the table because we've =
already established that nnhop FRR requires further extensions.
>=20
> Cheers
>=20
> Matt
>=20
> On Wed, Sep 26, 2018 at 10:17 AM Vishnu Pavan Beeram =
<vishnupavan@gmail.com <mailto:vishnupavan@gmail.com>> wrote:
> Alexander Hi!
> =20
> The intent of the following statement in Section 1 is certainly not to =
be evasive (slightly or otherwise).
>    Functionalities such as bandwidth admission control, LSP
>    priorities, preemption, auto-bandwidth and Fast Reroute
>    continue to work with this forwarding plane.
> =20
> We (the authors) still don=E2=80=99t see any problem with the above =
statement. But we=E2=80=99ll go ahead and make a slight adjustment (see =
below) to address your concern.
>    Key functionalities such as bandwidth admission control, LSP
>    priorities, preemption, auto-bandwidth and Fast Reroute via
>    facility backup protection continue to work with this
>    forwarding plane.
> =20
> Regards,
> -Pavan
>=20
>=20
> On Tue, Sep 25, 2018 at 11:34 AM Alexander Okonnikov =
<alexander.okonnikov@gmail.com <mailto:alexander.okonnikov@gmail.com>> =
wrote:
> Hi Panav,
>=20
> Ok, 1:1 is not to be supported by this approach. In general, 1:1 has =
its own benefits  - for example, it is more attractive versus N:1 in =
ring topologies. After all, it is FRR too, as N:1 one. My point was that =
description in section 1 is slightly evasive regarding FRR and other =
RSVP-TE properties (PMTUD).
>=20
> Thank you.
>=20
>=20
>> 16 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 4:38, Vishnu Pavan =
Beeram <vishnupavan@gmail.com <mailto:vishnupavan@gmail.com>> =
=D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):
>>=20
>> Alexander, Hi!
>> =20
>> Please see inline for responses (prefixed VPB).
>> =20
>> Regards,
>> -Pavan
>>=20
>> On Thu, Sep 13, 2018 at 1:37 PM Alexander Okonnikov =
<alexander.okonnikov@gmail.com <mailto:alexander.okonnikov@gmail.com>> =
wrote:
>> Hi Panav,
>>=20
>> =46rom section 7:
>>=20
>>=20
>> 	"If the label type is a delegation label, then the stacking =
procedure stops at that delegation hop."
>> =09
>> It is OK for "Stack to Reach Delegation Hop" approach, but it doesn't =
work for "Stack to Reach Egress", isn't it?
>>=20
>> [VPB] The logic specified in Section 7 could be used by any node =
constructing the label stack (this could be the ingress or a delegation =
hop). The sentence immediately following the above quoted sentence in =
Section 7 is important. It currently reads =E2=80=93
>> Approaches in Section 5.1 =
<https://tools.ietf.org/html/draft-ietf-mpls-rsvp-shared-labels-03#section=
-5.1> SHOULD be used to determine how the delegation labels are pushed =
in the label stack.
>> =20
>> The intent here is to say that if you encounter a delegation label, =
use the procedures outlined in Section 5.1 to determine how the =
delegation labels are pushed in the label stack. The following change to =
the text should address this comment:
>>=20
>> OLD:
>> If the label type is a delegation label, then the stacking procedure =
stops at that delegation hop. =20
>> Approaches in Section 5.1 =
<https://tools.ietf.org/html/draft-ietf-mpls-rsvp-shared-labels-03#section=
-5.1> SHOULD be used to determine how the delegation labels are pushed =
in the label stack.
>> =20
>> NEW:
>> If the label type is a delegation label, then the type of stacking =
approach chosen by the ingress for this LSP (Section 5.1) MUST be used =
to determine how the delegation labels are pushed in the label stack.
>>  =20
>>=20
>> Also, regarding FRR support. Section 1 says:
>>=20
>> 	"Functionalities such as bandwidth admission control, LSP =
priorities, preemption,=20
>> 	auto-bandwidth and Fast Reroute continue to work with this =
forwarding plane."
>> =09
>> It seems that shared labels approach supports only facility bypass =
link-protection. It doesn't support one-to-one link- and =
node-protection, per my understanding. Facility bypass node-protection =
is not supported as well (as mentioned in Section 8). Hence, FRR support =
is very limited, and section 1 needs correction.
>>=20
>> [VPB] I don=E2=80=99t see anything wrong with the quoted text. Fast =
Reroute for MPLS-TE LSPs can be realized by either the 1-to-1 protection =
mechanism (detours) or the facility bypass mechanism. The authors =
don=E2=80=99t intend to add procedures for 1-to-1 link/node protection =
(who needs it?).  The facility bypass link-protection procedure is =
discussed in this draft. The facility bypass node-protection procedure =
is discussed in =
https://tools.ietf.org/html/draft-chandra-mpls-rsvp-shared-labels-np-00 =
<https://tools.ietf.org/html/draft-chandra-mpls-rsvp-shared-labels-np-00> =
(this was presented at the last IETF).
>>  =20
>>=20
>> Thank you.
>>=20
>>> 13 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 20:28, Alexander =
Okonnikov <alexander.okonnikov@gmail.com =
<mailto:alexander.okonnikov@gmail.com>> =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=
=D0=BB(=D0=B0):
>>>=20
>>> Hi Panav,
>>>=20
>>> Questions regarding ETLD:
>>>=20
>>> The draft is not clear about signaling of ETLD attribute. It says =
that ETLD is conveyed as per-hop attribute. Is my understanding correct =
that it is conveyed as RRO Hop attribute? Probably it could be cleaned =
to avoid confusion whether ERO or RRO Hop attribute mechanism is used.
>>>=20
>>> Next, the draft says that:
>>>=20
>>> 	"... If a node is reached where the ETLD set from the previous =
hop is 1, then that
>>> 	node MUST select itself as the delegation hop.  If a node is =
reached and it is=20
>>> 	determined that this hop cannot receive more than one transport =
label, then that node=20
>>> 	MUST select itself as the delegation hop. ..."
>>>=20
>>> What is purpose of the second sentence/rule?
>>>=20
>>> Next:
>>>=20
>>> 	"If there is a node or a sequence of nodes along the path of the =
LSP that do not=20
>>> 	support ETLD, then the immediate hop that supports ETLD MUST =
select itself as the=20
>>> 	delegation hop."
>>>=20
>>> If some node (consecutive nodes) doesn't support ETLD then it =
doesn't support TE labels. Hence, that node (regular RSVP-TE LSR) will =
do SWAP and not POP. As a result non-decremented ETLD is OK and =
immediate hop that supports ETLD not necessary should become delegation =
hop?
>>>=20
>>> Also, from Section 9.7:
>>>=20
>>> "The ETLD field specifies the maximum number of transport labels =
that this hop can potentially send to its downstream hop.  It MUST be =
set to a non-zero value."
>>>=20
>>> Strictly speaking it is not correct. ETLD reflects decrementing =
counter and not capability of some transit node. I.e. if we consider LSP =
R1-R2-R3, R1 puts value 5 in ETLD,and R2 supports imposing of 2 labels, =
it doesn't mean that R2 should rewrite ETLD with value 2. It just should =
decrement value 5. Correct?
>>>=20
>>> Also, per my understanding it is supposed that in fact ETLD value =
will not be just decremented, but it will be copied from previous RRO =
Hop attributes subobject into being inserted RRO Hop attributes =
subobject with decrementing. May be it would be better to signal ETLD =
value in LSP Attributes object (and each capable node decrements ETLD =
value there), while signaling support of ETLD itself in RRO Hop =
attributes subobject?
>>>=20
>>> Thank you.
>>>=20
>>>> 13 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 20:22, Alexander =
Okonnikov <alexander.okonnikov@gmail.com =
<mailto:alexander.okonnikov@gmail.com>> =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=
=D0=BB(=D0=B0):
>>>>=20
>>>> Hi Pavan,
>>>>=20
>>>> I'm sorry for delay with answer.
>>>>=20
>>>> If ingress uses regular Path MTU discovery mechanism, it could =
produce value of MTU lower than actual one. This is because ingress =
doesn't know MTU per each hop. Let's consider case with four routers: R1 =
- R2 - R3 - R4. MTU for R1-R2 link is 2000, MTU for R2-R3 is 1600 and =
MTU for R3-R4 is 2000. By virtue of regular Path MTU discovery mechanism =
R1 will derive from FLOWSPEC that path MTU is 1600. As soon as R1 =
doesn't know how many labels in the stack will be on the lowest MTU hop, =
it can only set LSP MTU to most conservative value (1600 - 4 - 4 =3D =
1592, provided that R4 has advertised implicit null label). In fact =
actual path MTU is 1596 (1600 - 4 on R2-R3 hop). Of course, it could be =
acceptable, but calculated LSP MTU as more lower than actual as longer =
LSP path. For correct path MTU discovery ingress needs to know MTU per =
each hop.
>>>>=20
>>>> Thank you.
>>>>=20
>>>>> 6 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 18:27, Vishnu =
Pavan Beeram <vishnupavan@gmail.com <mailto:vishnupavan@gmail.com>> =
=D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):
>>>>>=20
>>>>> Alexander, Hi!
>>>>> =20
>>>>> I apologize for the delayed response.
>>>>> =20
>>>>> This draft does not propose any changes to the standard RSVP MTU =
signaling procedures (Int Serv object specific signaling procedures). =
After the initial signaling sequence is complete, an ingress =
implementation (RFC3209) would typically take the path MTU learnt via =
signaling, run it through some local logic and then arrive at an MTU =
value that can be assigned to the LSP. This local logic typically =
involves deducting the number of bytes in the label stack used for the =
LSP from the path MTU learnt via signaling. The ingress implementation =
supporting this draft will rely on the Resv RRO to accurately determine =
the max-number of labels pushed along the path of the LSP (note that =
with delegation, downstream hops can impose label stacks) and account =
for it in the local logic used to arrive at the MTU value assigned to =
the LSP.
>>>>> =20
>>>>> I hope this addresses your question..
>>>>> =20
>>>>> Regards,
>>>>> -Pavan
>>>>>=20
>>>>> On Tue, Aug 7, 2018 at 12:22 PM Alexander Okonnikov =
<alexander.okonnikov@gmail.com <mailto:alexander.okonnikov@gmail.com>> =
wrote:
>>>>> Hi Pavan,
>>>>>=20
>>>>>=20
>>>>> Regular RSVP-TE LSPs use standard RSVP path MTU discovery =
mechanism. That one cannot be used "as is" for approach described in the =
draft, and the draft doesn't address path MTU identification. Is it to =
be considered?
>>>>>=20
>>>>> Thank you.
>>>>>=20
>>>>> 26.07.2018 06:07, Vishnu Pavan Beeram =D0=BF=D0=B8=D1=88=D0=B5=D1=82=
:
>>>>>> Chairs, Hi!
>>>>>>=20
>>>>>> As mentioned (in our presentation) in last week's WG session, we =
believe that the draft is sufficiently baked and ready to progress to =
the next stage. We would like to formally request this draft to be =
considered for WG LC.
>>>>>>=20
>>>>>> Regards,
>>>>>> - Pavan (on behalf of the authors)
>>>>>>=20
>>>>>>=20
>>>>>> _______________________________________________
>>>>>> mpls mailing list
>>>>>> mpls@ietf.org <mailto:mpls@ietf.org>
>>>>>> https://www.ietf.org/mailman/listinfo/mpls =
<https://www.ietf.org/mailman/listinfo/mpls>
>>>>>=20
>>>>> _______________________________________________
>>>>> mpls mailing list
>>>>> mpls@ietf.org <mailto:mpls@ietf.org>
>>>>> https://www.ietf.org/mailman/listinfo/mpls =
<https://www.ietf.org/mailman/listinfo/mpls>
>>>>=20
>>>=20
>>=20
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org <mailto:mpls@ietf.org>
> https://www.ietf.org/mailman/listinfo/mpls =
<https://www.ietf.org/mailman/listinfo/mpls>


--Apple-Mail=_B22BB52A-C5C4-42EE-8890-C6BCCE8DDB88
Content-Transfer-Encoding: quoted-printable
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	charset=utf-8

<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; line-break: after-white-space;" class=3D"">Hi =
Pavan,<div class=3D""><br class=3D""></div><div class=3D"">Maybe it =
would be better to take out FRR link-protection description from this =
draft to&nbsp;<span style=3D"font-size: 1em;" =
class=3D"">draft-chandra-mpls-rsvp-shared-labels-np. Like we have RFC =
3209 and RFC 4090 that describe RSVP-TE LSP and FRR for RSVP-TE LSP, =
respectively.</span></div><div class=3D""><span style=3D"font-size: =
1em;" class=3D""><br class=3D""></span></div><div class=3D""><span =
style=3D"font-size: 1em;" class=3D"">Thank you.</span></div><div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D"">27 =
=D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 17:47, Matt Hartley =
&lt;<a href=3D"mailto:mhartley.ietf@gmail.com" =
class=3D"">mhartley.ietf@gmail.com</a>&gt; =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=
=B0=D0=BB(=D0=B0):</div><br class=3D"Apple-interchange-newline"><div =
class=3D""><div dir=3D"ltr" class=3D""><div class=3D"">Pavan,</div><div =
class=3D""><br class=3D""></div><div class=3D"">OK. That's reasonable, =
but it might be worth adding a line to the draft to say so.</div><div =
class=3D""><br class=3D""></div><div class=3D"">Cheers</div><div =
class=3D""><br class=3D""></div><div class=3D"">Matt<br =
class=3D""></div></div><br class=3D""><div class=3D"gmail_quote"><div =
dir=3D"ltr" class=3D"">On Thu, Sep 27, 2018 at 4:30 AM Vishnu Pavan =
Beeram &lt;<a href=3D"mailto:vishnupavan@gmail.com" =
class=3D"">vishnupavan@gmail.com</a>&gt; wrote:<br =
class=3D""></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 =
.8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr" =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><span class=3D"">Matt,
Hi!<span class=3D""></span></span></div><p class=3D"MsoNormal" =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span =
class=3D""><span class=3D"">&nbsp;</span></span></p><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span class=3D"">The
purpose of this document is to provide a mechanism to bring up MPLS =
RSVP-TE LSPs on a shared forwarding plane. There is a set of key RSVP-TE =
features/functionalities
specified in the Introduction Section that would <span =
class=3D""></span>continue to work with this forwarding plane
(without needing any special extensions). The authors believe that a =
deployable
solution can be implemented with this set of features/functionalities. =
<span class=3D""></span></span></div><p class=3D"MsoNormal" =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span =
class=3D""><span class=3D"">&nbsp;</span></span></p><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span class=3D"">If there
are any other desirable features/functionalities (that are not specified =
as
supported in this document) that can be supported on this forwarding =
plane by introducing a few protocol extensions, then those are expected =
to be discussed separately
(draft-chandra-mpls-rsvp-shared-labels-np is an example of that).<span =
class=3D""></span></span></div><p class=3D"MsoNormal" style=3D"margin:0in =
0in =
0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span =
class=3D""><span class=3D"">&nbsp;</span></span></p><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span class=3D"">Regards,<span =
class=3D""></span></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
class=3D"">-Pavan<span class=3D""></span></span></div>





</div><br class=3D""><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"">On Wed, Sep 26, 2018 at 10:56 AM Matt Hartley &lt;<a =
href=3D"mailto:mhartley.ietf@gmail.com" target=3D"_blank" =
class=3D"">mhartley.ietf@gmail.com</a>&gt; wrote:<br =
class=3D""></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 =
.8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr" =
class=3D""><div class=3D"">Pavan,</div><div class=3D""><br =
class=3D""></div><div class=3D"">The problem with lists like this (in =
general) is that it's not clear what the status is for anything that =
isn't on the list, and most lists will probably manage to omit =
*something*. I think there's three reasonable options:</div><div =
class=3D""><br class=3D""></div><div class=3D"">1. State unequivocally =
that everything works</div><div class=3D"">2. List the functionalities =
that definitely don't work, and make it clear that everything else =
does<br class=3D""></div><div class=3D"">3. List the functionalities =
that definitely work, and explicitly make no guarantees about anything =
that isn't listed.</div><div class=3D""><br class=3D""></div><div =
class=3D"">It isn't really clear what you're trying to do =
here.</div><div class=3D""><br class=3D""></div><div class=3D"">Note =
that in this case option 1 isn't on the table because we've already =
established that nnhop FRR requires further extensions.<br =
class=3D""></div><div class=3D""><br class=3D""></div><div =
class=3D"">Cheers</div><div class=3D""><br class=3D""></div><div =
class=3D"">Matt<br class=3D""></div><div class=3D""><br class=3D""><div =
class=3D"gmail_quote"><div dir=3D"ltr" class=3D"">On Wed, Sep 26, 2018 =
at 10:17 AM Vishnu Pavan Beeram &lt;<a =
href=3D"mailto:vishnupavan@gmail.com" target=3D"_blank" =
class=3D"">vishnupavan@gmail.com</a>&gt; wrote:<br =
class=3D""></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 =
.8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr" =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><span class=3D"">Alexander
Hi!<span class=3D""></span></span></div><p class=3D"MsoNormal" =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span =
class=3D""><span class=3D"">&nbsp;</span></span></p><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span class=3D"">The
intent of the following statement in Section 1 is certainly not to be =
evasive
(slightly or otherwise).<span class=3D""></span></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><span =
style=3D"font-size:10pt;font-family:&quot;Courier New&quot;" =
class=3D""><span class=3D"">&nbsp;&nbsp; </span>Functionalities such as =
bandwidth admission
control, LSP <span class=3D""></span></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-size:10pt;font-family:&quot;Courier =
New&quot;" class=3D""><span class=3D"">&nbsp;&nbsp; </span>priorities, =
preemption, auto-bandwidth and
Fast Reroute <span class=3D""></span></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-size:10pt;font-family:&quot;Courier =
New&quot;" class=3D""><span class=3D"">&nbsp;&nbsp; </span>continue to =
work with this forwarding plane.<span class=3D""></span></span></div><p =
class=3D"MsoNormal" style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span =
style=3D"font-size:10pt;font-family:&quot;Courier New&quot;" =
class=3D""><span class=3D"">&nbsp;</span></span></p><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span class=3D"">We (the authors) still don=E2=80=99t see
any problem with the above statement. But we=E2=80=99ll go ahead and =
make a slight
adjustment (see below) to address your concern.<span =
class=3D""></span></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
style=3D"font-size:10pt;font-family:&quot;Courier New&quot;" =
class=3D""><span class=3D"">&nbsp;&nbsp; </span>Key functionalities such =
as bandwidth
admission control, LSP <span class=3D""></span></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><span =
style=3D"font-size:10pt;font-family:&quot;Courier New&quot;" =
class=3D""><span class=3D"">&nbsp;&nbsp; </span>priorities, preemption, =
auto-bandwidth and
Fast Reroute via <span class=3D""></span></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><span =
style=3D"font-size:10pt;font-family:&quot;Courier New&quot;" =
class=3D""><span class=3D"">&nbsp;&nbsp; </span>facility backup =
protection continue to work
with this <span class=3D""></span></span></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-size:10pt;font-family:&quot;Courier =
New&quot;" class=3D""><span class=3D"">&nbsp;&nbsp; </span>forwarding =
plane.<span class=3D""></span></span></div><p class=3D"MsoNormal" =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span =
style=3D"font-size:10pt;font-family:&quot;Courier New&quot;" =
class=3D""><span class=3D"">&nbsp;</span></span></p><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span class=3D"">Regards,<span =
class=3D""></span></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
class=3D"">-Pavan<span class=3D""></span></span></div>





<br class=3D""><br class=3D""><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"">On Tue, Sep 25, 2018 at 11:34 AM Alexander Okonnikov &lt;<a =
href=3D"mailto:alexander.okonnikov@gmail.com" target=3D"_blank" =
class=3D"">alexander.okonnikov@gmail.com</a>&gt; wrote:<br =
class=3D""></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 =
.8ex;border-left:1px #ccc solid;padding-left:1ex"><div =
style=3D"word-wrap:break-word;line-break:after-white-space" class=3D"">Hi =
Panav,<div class=3D""><br class=3D""></div><div class=3D"">Ok, 1:1 is =
not to be supported by this approach. In general, 1:1 has its own =
benefits &nbsp;- for example, it is more attractive versus N:1 in ring =
topologies. After all, it is FRR too, as N:1 one. My point was that =
description in section 1 is slightly evasive regarding FRR and other =
RSVP-TE properties (PMTUD).</div><div class=3D""><br class=3D""></div><div=
 class=3D"">Thank you.</div><div class=3D""><br class=3D""><div =
class=3D""><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">16 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 4:38, =
Vishnu Pavan Beeram &lt;<a href=3D"mailto:vishnupavan@gmail.com" =
target=3D"_blank" class=3D"">vishnupavan@gmail.com</a>&gt; =
=D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):</div><br =
class=3D"m_-385941263647088565m_-1830687956985248383m_1343084799946502028m=
_2764878390082138059Apple-interchange-newline"><div class=3D""><div =
dir=3D"ltr" class=3D""><div style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
class=3D"">Alexander,
Hi!<span class=3D""></span></span></div><p class=3D"MsoNormal" =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span =
class=3D""><span class=3D"">&nbsp;</span></span></p><div =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
class=3D"">Please
see inline for responses (prefixed VPB).<span =
class=3D""></span></span></div><p class=3D"MsoNormal" style=3D"margin:0in =
0in =
0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span =
class=3D"">&nbsp;<span class=3D""></span></span></p><div =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
class=3D"">Regards,<span class=3D""></span></span></div><div =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
class=3D"">-Pavan<span class=3D""></span></span></div>





<br class=3D""><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"">On =
Thu, Sep 13, 2018 at 1:37 PM Alexander Okonnikov &lt;<a =
href=3D"mailto:alexander.okonnikov@gmail.com" target=3D"_blank" =
class=3D"">alexander.okonnikov@gmail.com</a>&gt; wrote:<br =
class=3D""></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 =
.8ex;border-left:1px #ccc solid;padding-left:1ex"><div =
style=3D"word-wrap:break-word;line-break:after-white-space" class=3D"">Hi =
Panav,<div class=3D""><br class=3D""></div><div class=3D""><div =
class=3D"">=46rom section 7:</div><div class=3D""><br =
class=3D""></div><div class=3D""><br class=3D""></div><div =
class=3D""><span =
class=3D"m_-385941263647088565m_-1830687956985248383m_1343084799946502028m=
_2764878390082138059m_879809512118735882Apple-tab-span" =
style=3D"white-space:pre-wrap">	</span>"If the label type is a =
delegation label, then the stacking procedure stops at that delegation =
hop."</div><div class=3D""><span =
class=3D"m_-385941263647088565m_-1830687956985248383m_1343084799946502028m=
_2764878390082138059m_879809512118735882Apple-tab-span" =
style=3D"white-space:pre-wrap">	</span></div><div class=3D"">It is OK =
for "Stack to Reach Delegation Hop" approach, but it doesn't work for =
"Stack to Reach Egress", isn't it?</div></div></div></blockquote><div =
class=3D""><br class=3D""></div><div class=3D""><div style=3D"margin:0in =
0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" =
class=3D""><span class=3D"">[VPB] The
logic specified in Section 7 could be used by any node constructing the =
label
stack (this could be the ingress or a delegation hop). The sentence =
immediately
following the above quoted sentence in Section 7 is important. It =
currently reads
=E2=80=93 <span class=3D""></span></span></div><div style=3D"margin:0in =
0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" =
class=3D""><span style=3D"font-size:10pt;font-family:&quot;Courier =
New&quot;" class=3D"">Approaches
in <a =
href=3D"https://tools.ietf.org/html/draft-ietf-mpls-rsvp-shared-labels-03#=
section-5.1" target=3D"_blank" class=3D""><span style=3D"color:blue" =
class=3D"">Section 5.1</span></a> SHOULD be used to determine how the
delegation labels are pushed in the label stack.<span =
class=3D""></span></span></div><p class=3D"MsoNormal" style=3D"margin:0in =
0in =
0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span =
class=3D""><span class=3D"">&nbsp;</span></span></p><div =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
class=3D"">The
intent here is to say that if you encounter a delegation label, use the
procedures outlined in Section 5.1 to determine how the delegation =
labels are
pushed in the label stack. The following change to the text should =
address
this comment:<span class=3D""></span></span></div>

</div><div class=3D""><br class=3D""><div style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
class=3D"">OLD:<span class=3D""></span></span></div>

<pre style=3D"margin:0in 0in =
0.0001pt;font-size:10pt;font-family:&quot;Courier New&quot;" =
class=3D""><span class=3D"">If the label type is a delegation label, =
then the stacking procedure stops at that delegation hop.<span =
class=3D"">&nbsp; </span><br class=3D"">Approaches in <a =
href=3D"https://tools.ietf.org/html/draft-ietf-mpls-rsvp-shared-labels-03#=
section-5.1" target=3D"_blank" class=3D""><span style=3D"color:blue" =
class=3D"">Section 5.1</span></a> SHOULD be used to determine how the =
delegation labels are pushed in the label stack.<span =
class=3D""></span></span></pre><p class=3D"MsoNormal" style=3D"margin:0in =
0in =
0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span =
class=3D""><span class=3D"">&nbsp;</span></span></p><div =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
class=3D"">NEW:<span class=3D""></span></span></div><div =
style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
style=3D"font-size:10pt;font-family:&quot;Courier New&quot;" class=3D"">If=
 the label type is a delegation
label, then the type of stacking approach chosen by the ingress for this =
LSP (Section
5.1) MUST be used to determine how the delegation labels are pushed in =
the label stack.</span><span class=3D""><span =
class=3D""></span></span></div><p class=3D"MsoNormal" style=3D"margin:0in =
0in =
0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span =
style=3D"font-size:10pt;font-family:&quot;Courier New&quot;" =
class=3D""><span class=3D""></span></span></p><div style=3D"margin:0in =
0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" =
class=3D""><span class=3D""><span class=3D""></span></span>&nbsp;





<br class=3D""></div></div><blockquote class=3D"gmail_quote" =
style=3D"margin:0 0 0 .8ex;border-left:1px #ccc =
solid;padding-left:1ex"><div =
style=3D"word-wrap:break-word;line-break:after-white-space" =
class=3D""><div class=3D""><div class=3D""><br class=3D""></div><div =
class=3D"">Also, regarding FRR support. Section 1 says:</div><div =
class=3D""><br class=3D""></div><div class=3D""><span =
class=3D"m_-385941263647088565m_-1830687956985248383m_1343084799946502028m=
_2764878390082138059m_879809512118735882Apple-tab-span" =
style=3D"white-space:pre-wrap">	</span>"Functionalities such as =
bandwidth admission control, LSP priorities, preemption,&nbsp;</div><div =
class=3D""><span =
class=3D"m_-385941263647088565m_-1830687956985248383m_1343084799946502028m=
_2764878390082138059m_879809512118735882Apple-tab-span" =
style=3D"white-space:pre-wrap">	</span>auto-bandwidth and Fast Reroute =
continue to work with this forwarding plane."</div><div class=3D""><span =
class=3D"m_-385941263647088565m_-1830687956985248383m_1343084799946502028m=
_2764878390082138059m_879809512118735882Apple-tab-span" =
style=3D"white-space:pre-wrap">	</span></div><div class=3D"">It seems =
that shared labels approach supports only facility bypass =
link-protection. It doesn't support one-to-one link- and =
node-protection, per my understanding. Facility bypass node-protection =
is not supported as well (as mentioned in Section 8). Hence, FRR support =
is very limited, and section 1 needs =
correction.</div></div></div></blockquote><div class=3D""><br =
class=3D""></div><div class=3D""><div style=3D"margin:0in 0in =
0.0001pt;font-size:11pt;font-family:Calibri,sans-serif" class=3D""><span =
class=3D"">[VPB] I don=E2=80=99t
see anything wrong with the quoted text. Fast Reroute for MPLS-TE LSPs =
can be realized
by either the 1-to-1 protection mechanism (detours) or the facility =
bypass mechanism.
The authors don=E2=80=99t intend to add procedures for 1-to-1 link/node =
protection (who
needs it?). <span class=3D"">&nbsp;</span>The facility bypass
link-protection procedure is discussed in this draft. The facility =
bypass
node-protection procedure is discussed in <a =
href=3D"https://tools.ietf.org/html/draft-chandra-mpls-rsvp-shared-labels-=
np-00" style=3D"color:blue;text-decoration:underline" target=3D"_blank" =
class=3D"">https://tools.ietf.org/html/draft-chandra-mpls-rsvp-shared-labe=
ls-np-00</a>
(this was presented at the last IETF). <span =
class=3D""></span></span></div>&nbsp;





<br class=3D""></div><blockquote class=3D"gmail_quote" style=3D"margin:0 =
0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div =
style=3D"word-wrap:break-word;line-break:after-white-space" =
class=3D""><div class=3D""><div class=3D""><br class=3D""></div><div =
class=3D"">Thank you.</div><div class=3D""><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D"">13 =D1=81=D0=B5=D0=BD=D1=82. =
2018 =D0=B3., =D0=B2 20:28, Alexander Okonnikov &lt;<a =
href=3D"mailto:alexander.okonnikov@gmail.com" target=3D"_blank" =
class=3D"">alexander.okonnikov@gmail.com</a>&gt; =
=D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):</div><br =
class=3D"m_-385941263647088565m_-1830687956985248383m_1343084799946502028m=
_2764878390082138059m_879809512118735882Apple-interchange-newline"><div =
class=3D""><div =
style=3D"word-wrap:break-word;line-break:after-white-space" class=3D"">Hi =
Panav,<div class=3D""><br class=3D""></div><div class=3D""><div =
class=3D"">Questions regarding ETLD:</div><div class=3D""><br =
class=3D""></div><div class=3D"">The draft is not clear about signaling =
of ETLD attribute. It says that ETLD is conveyed as per-hop attribute. =
Is my understanding correct that it is conveyed as RRO Hop attribute? =
Probably it could be cleaned to avoid confusion whether ERO or RRO Hop =
attribute mechanism is used.</div><div class=3D""><br =
class=3D""></div><div class=3D"">Next, the draft says that:</div><div =
class=3D""><br class=3D""></div><div class=3D""><span =
class=3D"m_-385941263647088565m_-1830687956985248383m_1343084799946502028m=
_2764878390082138059m_879809512118735882Apple-tab-span" =
style=3D"white-space:pre-wrap">	</span>"... If a node is reached where =
the ETLD set from the previous hop is 1, then that</div><div =
class=3D""><span =
class=3D"m_-385941263647088565m_-1830687956985248383m_1343084799946502028m=
_2764878390082138059m_879809512118735882Apple-tab-span" =
style=3D"white-space:pre-wrap">	</span>node MUST select itself as the =
delegation hop.&nbsp; If a node is reached and it is&nbsp;</div><div =
class=3D""><span =
class=3D"m_-385941263647088565m_-1830687956985248383m_1343084799946502028m=
_2764878390082138059m_879809512118735882Apple-tab-span" =
style=3D"white-space:pre-wrap">	</span>determined that this hop cannot =
receive more than one transport label, then that node&nbsp;</div><div =
class=3D""><span =
class=3D"m_-385941263647088565m_-1830687956985248383m_1343084799946502028m=
_2764878390082138059m_879809512118735882Apple-tab-span" =
style=3D"white-space:pre-wrap">	</span>MUST select itself as the =
delegation hop. ..."</div><div class=3D""><br class=3D""></div><div =
class=3D"">What is purpose of the second sentence/rule?</div><div =
class=3D""><br class=3D""></div><div class=3D"">Next:</div><div =
class=3D""><br class=3D""></div><div class=3D""><span =
class=3D"m_-385941263647088565m_-1830687956985248383m_1343084799946502028m=
_2764878390082138059m_879809512118735882Apple-tab-span" =
style=3D"white-space:pre-wrap">	</span>"If there is a node or a sequence =
of nodes along the path of the LSP that do not&nbsp;</div><div =
class=3D""><span =
class=3D"m_-385941263647088565m_-1830687956985248383m_1343084799946502028m=
_2764878390082138059m_879809512118735882Apple-tab-span" =
style=3D"white-space:pre-wrap">	</span>support ETLD, then the immediate =
hop that supports ETLD MUST select itself as the&nbsp;</div><div =
class=3D""><span =
class=3D"m_-385941263647088565m_-1830687956985248383m_1343084799946502028m=
_2764878390082138059m_879809512118735882Apple-tab-span" =
style=3D"white-space:pre-wrap">	</span>delegation hop."</div><div =
class=3D""><br class=3D""></div><div class=3D"">If some node =
(consecutive nodes) doesn't support ETLD then it doesn't support TE =
labels. Hence, that node (regular RSVP-TE LSR) will do SWAP and not POP. =
As a result non-decremented ETLD is OK and immediate hop that supports =
ETLD not necessary should become delegation hop?</div><div class=3D""><br =
class=3D""></div><div class=3D"">Also, from Section 9.7:</div><div =
class=3D""><br class=3D""></div><div class=3D"">"The ETLD field =
specifies the maximum number of transport labels that this hop can =
potentially send to its downstream hop.&nbsp; It MUST be set to a =
non-zero value."</div><div class=3D""><br class=3D""></div><div =
class=3D"">Strictly speaking it is not correct. ETLD reflects =
decrementing counter and not capability of some transit node. I.e. if we =
consider LSP R1-R2-R3, R1 puts value 5 in ETLD,and R2 supports imposing =
of 2 labels, it doesn't mean that R2 should rewrite ETLD with value 2. =
It just should decrement value 5. Correct?</div><div class=3D""><br =
class=3D""></div><div class=3D"">Also, per my understanding it is =
supposed that in fact ETLD value will not be just decremented, but it =
will be copied from previous RRO Hop attributes subobject into being =
inserted RRO Hop attributes subobject with decrementing. May be it would =
be better to signal ETLD value in LSP Attributes object (and each =
capable node decrements ETLD value there), while signaling support of =
ETLD itself in RRO Hop attributes subobject?</div><div class=3D""><br =
class=3D""></div><div class=3D"">Thank you.</div><div class=3D""><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D"">13 =
=D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 20:22, Alexander =
Okonnikov &lt;<a href=3D"mailto:alexander.okonnikov@gmail.com" =
target=3D"_blank" class=3D"">alexander.okonnikov@gmail.com</a>&gt; =
=D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):</div><br =
class=3D"m_-385941263647088565m_-1830687956985248383m_1343084799946502028m=
_2764878390082138059m_879809512118735882Apple-interchange-newline"><div =
class=3D""><div =
style=3D"word-wrap:break-word;line-break:after-white-space" =
class=3D""><div class=3D"">Hi Pavan,</div><div class=3D""><br =
class=3D""></div><div class=3D"">I'm sorry for delay with =
answer.</div><div class=3D""><br class=3D""></div><div class=3D"">If =
ingress uses regular Path MTU discovery mechanism, it could produce =
value of MTU lower than actual one. This is because ingress doesn't know =
MTU per each hop. Let's consider case with four routers: R1 - R2 - R3 - =
R4. MTU for R1-R2 link is 2000, MTU for R2-R3 is 1600 and MTU for R3-R4 =
is 2000. By virtue of regular Path MTU discovery mechanism R1 will =
derive from FLOWSPEC that path MTU is 1600. As soon as R1 doesn't know =
how many labels in the stack will be on the lowest MTU hop, it can only =
set LSP MTU to most conservative value (1600 - 4 - 4 =3D 1592, provided =
that R4 has advertised implicit null label). In fact actual path MTU is =
1596 (1600 - 4 on R2-R3 hop). Of course, it could be acceptable, but =
calculated LSP MTU as more lower than actual as longer LSP path. For =
correct path MTU discovery ingress needs to know MTU per each =
hop.</div><div class=3D""><br class=3D""></div><div class=3D"">Thank =
you.</div><div class=3D""><br class=3D""><blockquote type=3D"cite" =
class=3D""><div class=3D"">6 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2=
 18:27, Vishnu Pavan Beeram &lt;<a href=3D"mailto:vishnupavan@gmail.com" =
target=3D"_blank" class=3D"">vishnupavan@gmail.com</a>&gt; =
=D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):</div><br =
class=3D"m_-385941263647088565m_-1830687956985248383m_1343084799946502028m=
_2764878390082138059m_879809512118735882Apple-interchange-newline"><div =
class=3D""><div dir=3D"ltr" class=3D""><div dir=3D"ltr" =
class=3D"">Alexander, Hi!<br class=3D"">&nbsp;<br class=3D"">I apologize =
for the delayed response.<br class=3D"">&nbsp;<br class=3D"">This draft =
does not propose any changes to the standard RSVP MTU signaling =
procedures (Int Serv object specific signaling procedures). After the =
initial signaling sequence is complete, an ingress implementation =
(RFC3209) would typically take the path MTU learnt via signaling, run it =
through some local logic and then arrive at an MTU value that can be =
assigned to the LSP. This local logic typically involves deducting the =
number of bytes in the label stack used for the LSP from the path MTU =
learnt via signaling. The ingress implementation supporting this draft =
will rely on the Resv RRO to accurately determine the max-number of =
labels pushed along the path of the LSP (note that with delegation, =
downstream hops can impose label stacks) and account for it in the local =
logic used to arrive at the MTU value assigned to the LSP.<br =
class=3D"">&nbsp;<br class=3D"">I hope this addresses your question..<br =
class=3D"">&nbsp;<br class=3D"">Regards,<br class=3D"">-Pavan<br =
class=3D""></div></div><br class=3D""><div class=3D"gmail_quote"><div =
dir=3D"ltr" class=3D"">On Tue, Aug 7, 2018 at 12:22 PM Alexander =
Okonnikov &lt;<a href=3D"mailto:alexander.okonnikov@gmail.com" =
target=3D"_blank" class=3D"">alexander.okonnikov@gmail.com</a>&gt; =
wrote:<br class=3D""></div><blockquote class=3D"gmail_quote" =
style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
 =20
   =20
 =20
  <div text=3D"#000000" bgcolor=3D"#FFFFFF" class=3D""><p class=3D"">Hi =
Pavan,</p><p class=3D""><br class=3D"">
    </p><p class=3D"">Regular RSVP-TE LSPs use standard RSVP path MTU =
discovery
      mechanism. That one cannot be used "as is" for approach described
      in the draft, and the draft doesn't address path MTU
      identification. Is it to be considered?<br class=3D"">
    </p><p class=3D""><br class=3D"">
    </p><p class=3D"">Thank you.<br class=3D"">
    </p>
    <br class=3D"">
    <div =
class=3D"m_-385941263647088565m_-1830687956985248383m_1343084799946502028m=
_2764878390082138059m_879809512118735882m_-6153622752759840168moz-cite-pre=
fix">26.07.2018 06:07, Vishnu Pavan Beeram
      =D0=BF=D0=B8=D1=88=D0=B5=D1=82:<br class=3D"">
    </div>
    <blockquote type=3D"cite" class=3D"">
     =20
      <div dir=3D"ltr" class=3D"">
        <div class=3D"">Chairs, Hi!</div>
        <div class=3D""><br class=3D"">
        </div>
        <div class=3D"">As mentioned (in our presentation) in last =
week's WG
          session, we believe that the draft is sufficiently baked and
          ready to progress to the next stage. We would like to formally
          request this draft to be considered for WG LC.<br class=3D"">
        </div>
        <div class=3D""><br class=3D"">
        </div>
        <div class=3D"">Regards,</div>
        <div class=3D"">- Pavan (on behalf of the authors)<br class=3D"">
        </div>
      </div>
      <br class=3D"">
      <fieldset =
class=3D"m_-385941263647088565m_-1830687956985248383m_1343084799946502028m=
_2764878390082138059m_879809512118735882m_-6153622752759840168mimeAttachme=
ntHeader"></fieldset>
      <br class=3D"">
      <pre class=3D"">_______________________________________________
mpls mailing list
<a =
class=3D"m_-385941263647088565m_-1830687956985248383m_1343084799946502028m=
_2764878390082138059m_879809512118735882m_-6153622752759840168moz-txt-link=
-abbreviated" href=3D"mailto:mpls@ietf.org" =
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</pre>
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    <br class=3D"">
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 class=3D""></div></div></div></blockquote></div><br =
class=3D""></div></div></blockquote></div></div>
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From: Anil Kumar <anil.ietf@gmail.com>
Date: Fri, 5 Oct 2018 11:53:50 +0530
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Subject: [mpls] New Version Notification for draft-abd-mpls-ldp-identifier-name-00.txt
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--00000000000045adab057775513f
Content-Type: text/plain; charset="UTF-8"

Hi All,

Request for review comments and suggestions.

A new version of I-D, draft-abd-mpls-ldp-identifier-name-00.txt
has been successfully submitted by Anil Kumar S N and posted to the
IETF repository.

Name:           draft-abd-mpls-ldp-identifier-name
Revision:       00
Title:          MPLS LDP Identifier Name
Document date:  2018-09-21
Group:          Individual Submission
Pages:          7
URL:
https://www.ietf.org/internet-drafts/draft-abd-mpls-ldp-identifier-name-00.txt
Status:
https://datatracker.ietf.org/doc/draft-abd-mpls-ldp-identifier-name/
Htmlized:
https://tools.ietf.org/html/draft-abd-mpls-ldp-identifier-name-00
Htmlized:
https://datatracker.ietf.org/doc/html/draft-abd-mpls-ldp-identifier-name


Abstract:
   This document introduces a new optional LDP Identifier Name TLV that
   allows LDP routers to inform their LDP-Identifier-to-Name mapping in
   LDP Hello messages as part of the LDP Discovery Mechanism.  This
   document describes a mechanism to provide a simple and dynamic
   mechanism for ldp routers to learn about symbolic LDP Identifier
   Names.

--00000000000045adab057775513f
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_quote">Hi All,</div><div class=3D"gmai=
l_quote"><br></div><div class=3D"gmail_quote">Request for review comments a=
nd suggestions.=C2=A0</div><div class=3D"gmail_quote"><br>
A new version of I-D, draft-abd-mpls-ldp-identifier-name-00.txt<br>
has been successfully submitted by Anil Kumar S N and posted to the<br>
IETF repository.<br>
<br>
Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-abd-mpls-ldp-identifier=
-name<br>
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A000<br>
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 MPLS LDP Identifier Name<br>
Document date:=C2=A0 2018-09-21<br>
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission<br>
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 7<br>
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"https://www.ietf.o=
rg/internet-drafts/draft-abd-mpls-ldp-identifier-name-00.txt" rel=3D"norefe=
rrer" target=3D"_blank">https://www.ietf.org/internet-drafts/draft-abd-mpls=
-ldp-identifier-name-00.txt</a><br>
Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.iet=
f.org/doc/draft-abd-mpls-ldp-identifier-name/" rel=3D"noreferrer" target=3D=
"_blank">https://datatracker.ietf.org/doc/draft-abd-mpls-ldp-identifier-nam=
e/</a><br>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://tools.ietf.org/html/=
draft-abd-mpls-ldp-identifier-name-00" rel=3D"noreferrer" target=3D"_blank"=
>https://tools.ietf.org/html/draft-abd-mpls-ldp-identifier-name-00</a><br>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.ietf.org=
/doc/html/draft-abd-mpls-ldp-identifier-name" rel=3D"noreferrer" target=3D"=
_blank">https://datatracker.ietf.org/doc/html/draft-abd-mpls-ldp-identifier=
-name</a><br>
<br>
<br>
Abstract:<br>
=C2=A0 =C2=A0This document introduces a new optional LDP Identifier Name TL=
V that<br>
=C2=A0 =C2=A0allows LDP routers to inform their LDP-Identifier-to-Name mapp=
ing in<br>
=C2=A0 =C2=A0LDP Hello messages as part of the LDP Discovery Mechanism.=C2=
=A0 This<br>
=C2=A0 =C2=A0document describes a mechanism to provide a simple and dynamic=
<br>
=C2=A0 =C2=A0mechanism for ldp routers to learn about symbolic LDP Identifi=
er<br>
=C2=A0 =C2=A0Names.<br><br>
</div></div>

--00000000000045adab057775513f--


From nobody Sun Oct  7 23:10:24 2018
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From: Loa Andersson <loa@pi.nu>
To: "mpls@ietf.org" <mpls@ietf.org>, "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "draft-ietf-mpls-egress-protection-framework@ietf.org" <draft-ietf-mpls-egress-protection-framework@ietf.org>
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Subject: [mpls] Closed: working group last call on draft-ietf-mpls-egress-protection-framework
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  Working Group,

This working group last call is closed. We will put it in "Waiting for
working group chair go ahead" and ask the authors if they have any last
minutes changes, before proceeding to request publication.

/Loa
mpls we co-chair

On 2018-09-13 18:05, Loa Andersson wrote:
> Working Group,
> 
> This is to initiate a two week working group last call on draft-
> ietf-mpls-egress-protection-framework.
> 
> Please send your comments to the mpls wg mailing list (mpls@ietf.org).
> 
> There are no IPR disclosures against draft-ietf-mpls-egress-protection-
> framework, however there are 3 disclosures against the individual
> document that we accepted as a working group 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 document.
> 
> This working group last call ends October 10, 2018.
> 
> 
> /Loa
> mpls wg co-chair

-- 


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


From nobody Mon Oct  8 12:11:40 2018
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Subject: [mpls] I-D Action: draft-ietf-mpls-rsvp-shared-labels-04.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Multiprotocol Label Switching WG of the IETF.

        Title           : Signaling RSVP-TE tunnels on a shared MPLS forwarding plane
        Authors         : Harish Sitaraman
                          Vishnu Pavan Beeram
                          Tejal Parikh
                          Tarek Saad
	Filename        : draft-ietf-mpls-rsvp-shared-labels-04.txt
	Pages           : 21
	Date            : 2018-10-08

Abstract:
   As the scale of MPLS RSVP-TE networks has grown, so the number of
   Label Switched Paths (LSPs) supported by individual network elements
   has increased.  Various implementation recommendations have been
   proposed to manage the resulting increase in control plane state.

   However, those changes have had no effect on the number of labels
   that a transit Label Switching Router (LSR) has to support in the
   forwarding plane.  That number is governed by the number of LSPs
   transiting or terminated at the LSR and is directly related to the
   total LSP state in the control plane.

   This document defines a mechanism to prevent the maximum size of the
   label space limit on an LSR from being a constraint to control plane
   scaling on that node.  It introduces the notion of pre-installed 'per
   Traffic Engineering (TE) link labels' that can be shared by MPLS
   RSVP-TE LSPs that traverse these TE links.  This approach
   significantly reduces the forwarding plane state required to support
   a large number of LSPs.  This couples the feature benefits of the
   RSVP-TE control plane with the simplicity of the Segment Routing MPLS
   forwarding plane.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-rsvp-shared-labels/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-mpls-rsvp-shared-labels-04
https://datatracker.ietf.org/doc/html/draft-ietf-mpls-rsvp-shared-labels-04

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-rsvp-shared-labels-04


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 Mon Oct  8 12:15:51 2018
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From: Vishnu Pavan Beeram <vishnupavan@gmail.com>
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Cc: IETF MPLS List <mpls@ietf.org>, mpls-chairs@ietf.org,  draft-ietf-mpls-rsvp-shared-labels@ietf.org, TEAS WG <teas@ietf.org>
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Subject: Re: [mpls] Closed: working group last call on draft-ietf-mpls-rsvp-shared-labels
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Loa, Hi!

We just uploaded a new version (-04) of this draft. This covers all the
changes that the authors agreed to incorporate into the document during the
LC.

Regards,
-Pavan (on behalf of the authors)

On Fri, Sep 28, 2018 at 10:05 PM Loa Andersson <loa@pi.nu> wrote:

> Working Group(s),
>
> This wglc has been closed! There have been comments and I think good
> progress in resolving them.
>
> Can the authors please detail how/if they want to change the document
> and post the new version as necessary.
>
> /Loa
>
>
> On 2018-09-11 15:56, Loa Andersson wrote:
> > Working Group,
> >
> > This is to initiate a two week working group last call on draft-
> > ietf-mpls-rsvp-shared-labels.
> >
> > Please send your comments to the mpls wg mailing list (mpls@ietf.org).
> >
> > There are five IPR disclosures against draft-ietf-mpls-rsvp-shared-
> > labels, however some of them are updates.
> >
> > 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 document.
> >
> > The draft is very specific to MPLS, but since it uses and makes
> > additions to RSVP-TE we are copying the wglc to the TEAS working group.
> >
> > This working group last call ends September 26, 2018.
> >
> >
> > /Loa
> > MPLS wg co-chair
>
> --
>
>
> Loa Andersson                        email: loa@pi.nu
> Senior MPLS Expert
> Bronze Dragon Consulting             phone: +46 739 81 21 64
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

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<div dir=3D"ltr">Loa, Hi!<br><div><br></div><div>We just uploaded a new ver=
sion (-04) of this draft. This covers all the changes that the authors agre=
ed to incorporate into the document during the LC.</div><div><br></div><div=
>Regards,</div><div>-Pavan (on behalf of the authors)<br></div></div><br><d=
iv class=3D"gmail_quote"><div dir=3D"ltr">On Fri, Sep 28, 2018 at 10:05 PM =
Loa Andersson &lt;<a href=3D"mailto:loa@pi.nu">loa@pi.nu</a>&gt; wrote:<br>=
</div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-l=
eft:1px #ccc solid;padding-left:1ex">Working Group(s),<br>
<br>
This wglc has been closed! There have been comments and I think good<br>
progress in resolving them.<br>
<br>
Can the authors please detail how/if they want to change the document<br>
and post the new version as necessary.<br>
<br>
/Loa<br>
<br>
<br>
On 2018-09-11 15:56, Loa Andersson wrote:<br>
&gt; Working Group,<br>
&gt; <br>
&gt; This is to initiate a two week working group last call on draft-<br>
&gt; ietf-mpls-rsvp-shared-labels.<br>
&gt; <br>
&gt; Please send your comments to the mpls wg mailing list (<a href=3D"mail=
to:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a>).<br>
&gt; <br>
&gt; There are five IPR disclosures against draft-ietf-mpls-rsvp-shared-<br=
>
&gt; labels, however some of them are updates.<br>
&gt; <br>
&gt; All the authors and contributors have stated on the working group<br>
&gt; mailing list that they are not aware of any other IPRs that relates<br=
>
&gt; to this document.<br>
&gt; <br>
&gt; The draft is very specific to MPLS, but since it uses and makes<br>
&gt; additions to RSVP-TE we are copying the wglc to the TEAS working group=
.<br>
&gt; <br>
&gt; This working group last call ends September 26, 2018.<br>
&gt; <br>
&gt; <br>
&gt; /Loa<br>
&gt; MPLS wg co-chair<br>
<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@pi.nu" target=3D"_blank"=
>loa@pi.nu</a><br>
Senior MPLS Expert<br>
Bronze Dragon Consulting=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pho=
ne: +46 739 81 21 64<br>
<br>
_______________________________________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/mpls</a><br>
</blockquote></div>

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From: Vishnu Pavan Beeram <vishnupavan@gmail.com>
Date: Mon, 8 Oct 2018 15:24:18 -0400
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To: Alexander Okonnikov <alexander.okonnikov@gmail.com>
Cc: IETF MPLS List <mpls@ietf.org>
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Subject: Re: [mpls] Requesting WG LC for draft-ietf-mpls-rsvp-shared-labels
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Alexander, Hi!

Please review the latest version of the draft. We have left the use of
segment routed bypass tunnels for further study. This should address your
comment about the previous text being not precise enough.

Regards,
-Pavan

On Mon, Oct 1, 2018 at 4:29 AM Alexander Okonnikov <
alexander.okonnikov@gmail.com> wrote:

> Hi Pavan,
>
> The text proposed assumes that both kinds of bypass tunnels - regular and
> segment-routed - can be used. But, if segment-routed one is used, it can
> cause re-election of delegation hops and re-signaling protected LSP. For
> example, when segment-routed bypass tunnel has been rerouted, and its pat=
h
> length has been changed, ETLD value will be modified.
>
> Hence, I think that description should be more precise - which kinds of
> bypass tunnel are allowed for different kinds of segment-routed LSPs (w/o
> delegation hops, w/ explicit/automatic delegation hops), and what are
> procedures for using them.
>
> Thank you.
>
> 27 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 10:44, Vishnu Pavan Bee=
ram <vishnupavan@gmail.com>
> =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):
>
> Alexander, Hi!
>
>
> As you have observed, the draft doesn=E2=80=99t preclude the use of share=
d labels
> for bypass tunnels (when there is such a desire to do so). The intent of
> the text in Section 5.3.1 (that you have highlighted) is to simply say th=
at
> the ETLD processing at the ingress/delegation-hop MUST account for the
> bypass tunnel=E2=80=99s label(s). The following update to the text should=
 address
> your concern:
>
>
>    When an LSP that requests automatic delegation also requests facility
>    backup protection [RFC4090 <https://tools.ietf.org/html/rfc4090>], the
> ingress or the delegation hop MUST
>    account for the bypass tunnel's label(s) when populating the ETLD.
> Hence,
>    when a regular bypass tunnel is used to protect the facility, the ETLD
>    that gets populated on these nodes is one less than what gets
> populated
>    for a corresponding unprotected LSP.
>
>
> Regards,
> -Pavan
>
> On Wed, Sep 26, 2018 at 10:44 AM Alexander Okonnikov <
> alexander.okonnikov@gmail.com> wrote:
>
>> Hi Pavan,
>>
>> The fact that facility bypass LSP is being established according to RFC
>> 4090 doesn't necessary mean that it itself cannot be shared segment RSVP=
-TE
>> LSP. One can assume that the same approach is used for bypass tunnels to=
o
>> (to take benefits of shared segment approach). And it could be, unless
>> automatic delegation is used for some protected LSP.
>>
>> Thank you.
>>
>> 26 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 17:20, Vishnu Pavan Be=
eram <vishnupavan@gmail.com>
>> =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):
>>
>> Alex, Hi!
>>
>> Yes, the bypass tunnel (as indicated by the reference) referred to here
>> is a regular RFC4090 bypass tunnel.
>>
>> Regards,
>> -Pavan
>>
>> On Tue, Sep 25, 2018 at 11:43 AM Alexander Okonnikov <
>> alexander.okonnikov@gmail.com> wrote:
>>
>>> Hi Pavan,
>>>
>>> One question regarding ETLD. The draft says (section 5.3.1):
>>>
>>>    When an LSP that requests automatic delegation also requests facilit=
y
>>>    backup protection [RFC4090 <https://tools.ietf.org/html/rfc4090>], t=
he ingress or the delegation hop MUST
>>>    account for the bypass tunnel's label when populating the ETLD.  So,
>>>    the ETLD that gets populated on these nodes is one less than what
>>>    gets populated for a corresponding unprotected LSP.
>>>
>>>
>>> I.e. is it assumed that bypass tunnel itself will be regular RSVP-TE
>>> LSP? Otherwise, if bypass LSP is signalled using shared labels approach=
,
>>> ETLD should be decreased for amount of label stack depth, imposed by th=
is
>>> PLR (ingress or delegation hop) for bypass tunnel.
>>>
>>> Thank you.
>>>
>>> 16 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 3:03, Vishnu Pavan Be=
eram <vishnupavan@gmail.com>
>>> =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):
>>>
>>> Alexander, Hi!
>>>
>>>
>>> Much Thanks for the review comments. Please keep them coming.
>>> Please see inline for responses (prefixed VPB).
>>>
>>>
>>> Regards,
>>> -Pavan
>>>
>>>
>>> On Thu, Sep 13, 2018 at 1:28 PM Alexander Okonnikov <
>>> alexander.okonnikov@gmail.com> wrote:
>>>
>>>> Hi Panav,
>>>>
>>>> Questions regarding ETLD:
>>>>
>>>> The draft is not clear about signaling of ETLD attribute. It says that
>>>> ETLD is conveyed as per-hop attribute. Is my understanding correct tha=
t it
>>>> is conveyed as RRO Hop attribute? Probably it could be cleaned to avoi=
d
>>>> confusion whether ERO or RRO Hop attribute mechanism is used.
>>>>
>>>
>>> [VPB] The ETLD specific protocol extensions are discussed in Section
>>> 9.7. This section clearly states that the ETLD TLV is carried in the
>>> HOP_ATTRIBUTES subobject of an RRO object in the Path message. That sai=
d,
>>> the following tweak to the text in Section 5.3.1 should address your
>>> comment:
>>>
>>>
>>> OLD:
>>> The ETLD is signaled as a per-hop attribute in the Path message [RFC757=
0
>>> <https://tools.ietf.org/html/rfc7570>].
>>>
>>>
>>> NEW:
>>> The ETLD is signaled as a per-hop recorded attribute in the Path messag=
e
>>> [RFC7570 <https://tools.ietf.org/html/rfc7570>].
>>>
>>>
>>>
>>>
>>>>
>>>> Next, the draft says that:
>>>>
>>>> "... If a node is reached where the ETLD set from the previous hop is
>>>> 1, then that
>>>> node MUST select itself as the delegation hop.  If a node is reached
>>>> and it is
>>>> determined that this hop cannot receive more than one transport label,
>>>> then that node
>>>> MUST select itself as the delegation hop. ..."
>>>>
>>>> What is purpose of the second sentence/rule?
>>>>
>>>
>>> [VPB] Selecting oneself as a delegation hop ensures that the incoming
>>> packet will not carry more than one transport label. The second sentenc=
e
>>> above was added to let the transit node have the ability to influence t=
he
>>> delegation decision if it ran into some local policy/limitation that
>>> prevented it from receiving more than one transport label. As an
>>> alternative, the transit node may decide to choose a regular swap label=
 in
>>> such scenarios and let some downstream node be the delegation hop.
>>>
>>>
>>>>
>>>> Next:
>>>>
>>>> "If there is a node or a sequence of nodes along the path of the LSP
>>>> that do not
>>>> support ETLD, then the immediate hop that supports ETLD MUST select
>>>> itself as the
>>>> delegation hop."
>>>>
>>>> If some node (consecutive nodes) doesn't support ETLD then it doesn't
>>>> support TE labels. Hence, that node (regular RSVP-TE LSR) will do SWAP=
 and
>>>> not POP. As a result non-decremented ETLD is OK and immediate hop that
>>>> supports ETLD not necessary should become delegation hop?
>>>>
>>>>
>>> [VPB] If an intermediate transit node doesn=E2=80=99t support ETLD, it =
will not
>>> record ETLD for that hop. The immediate hop that supports ETLD will rea=
lize
>>> that the previous hop doesn=E2=80=99t support ETLD (no recording availa=
ble for the
>>> previous hop) and designates itself as a delegation hop.
>>>
>>>
>>>> Also, from Section 9.7:
>>>>
>>>> "The ETLD field specifies the maximum number of transport labels that
>>>> this hop can potentially send to its downstream hop.  It MUST be set t=
o a
>>>> non-zero value."
>>>>
>>>> Strictly speaking it is not correct. ETLD reflects decrementing counte=
r
>>>> and not capability of some transit node. I.e. if we consider LSP R1-R2=
-R3,
>>>> R1 puts value 5 in ETLD,and R2 supports imposing of 2 labels, it doesn=
't
>>>> mean that R2 should rewrite ETLD with value 2. It just should decremen=
t
>>>> value 5. Correct?
>>>>
>>>>
>>> [VPB] I agree that the above sentence can read better. The intent was t=
o
>>> say =E2=80=93 =E2=80=9Cthe maximum number of transport labels that the =
hop can send in
>>> relation to its position in the path=E2=80=9D. The following tweak to t=
he sentence
>>> should address your concern:
>>>
>>>
>>> OLD:
>>> The ETLD field specifies the maximum number of transport labels that
>>> this hop can potentially send to its downstream hop.
>>>
>>>
>>> NEW:
>>> The ETLD field specifies the effective number of transport labels that
>>> this hop (in relation to its position in the path) can potentially send=
 to
>>> its downstream hop.
>>>
>>>
>>>
>>>
>>>> Also, per my understanding it is supposed that in fact ETLD value will
>>>> not be just decremented, but it will be copied from previous RRO Hop
>>>> attributes subobject into being inserted RRO Hop attributes subobject =
with
>>>> decrementing. May be it would be better to signal ETLD value in LSP
>>>> Attributes object (and each capable node decrements ETLD value there),
>>>> while signaling support of ETLD itself in RRO Hop attributes subobject=
?
>>>>
>>>>
>>> [VPB] The authors did consider the alternative protocol extensions that
>>> you have specified above. We decided to use the current encoding in the
>>> draft because there was no good reason to get 2 code-points for ETLD wh=
en
>>> the same objective could be achieved with one code-point.
>>>
>>>
>>>> Thank you.
>>>>
>>>> 13 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 20:22, Alexander Oko=
nnikov <
>>>> alexander.okonnikov@gmail.com> =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=
=BB(=D0=B0):
>>>>
>>>> Hi Pavan,
>>>>
>>>> I'm sorry for delay with answer.
>>>>
>>>> If ingress uses regular Path MTU discovery mechanism, it could produce
>>>> value of MTU lower than actual one. This is because ingress doesn't kn=
ow
>>>> MTU per each hop. Let's consider case with four routers: R1 - R2 - R3 =
- R4.
>>>> MTU for R1-R2 link is 2000, MTU for R2-R3 is 1600 and MTU for R3-R4 is
>>>> 2000. By virtue of regular Path MTU discovery mechanism R1 will derive=
 from
>>>> FLOWSPEC that path MTU is 1600. As soon as R1 doesn't know how many la=
bels
>>>> in the stack will be on the lowest MTU hop, it can only set LSP MTU to=
 most
>>>> conservative value (1600 - 4 - 4 =3D 1592, provided that R4 has advert=
ised
>>>> implicit null label). In fact actual path MTU is 1596 (1600 - 4 on R2-=
R3
>>>> hop). Of course, it could be acceptable, but calculated LSP MTU as mor=
e
>>>> lower than actual as longer LSP path. For correct path MTU discovery
>>>> ingress needs to know MTU per each hop.
>>>>
>>>> Thank you.
>>>>
>>>> 6 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 18:27, Vishnu Pavan B=
eeram <vishnupavan@gmail.com>
>>>> =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):
>>>>
>>>> Alexander, Hi!
>>>>
>>>> I apologize for the delayed response.
>>>>
>>>> This draft does not propose any changes to the standard RSVP MTU
>>>> signaling procedures (Int Serv object specific signaling procedures). =
After
>>>> the initial signaling sequence is complete, an ingress implementation
>>>> (RFC3209) would typically take the path MTU learnt via signaling, run =
it
>>>> through some local logic and then arrive at an MTU value that can be
>>>> assigned to the LSP. This local logic typically involves deducting the
>>>> number of bytes in the label stack used for the LSP from the path MTU
>>>> learnt via signaling. The ingress implementation supporting this draft=
 will
>>>> rely on the Resv RRO to accurately determine the max-number of labels
>>>> pushed along the path of the LSP (note that with delegation, downstrea=
m
>>>> hops can impose label stacks) and account for it in the local logic us=
ed to
>>>> arrive at the MTU value assigned to the LSP.
>>>>
>>>> I hope this addresses your question.
>>>>
>>>> Regards,
>>>> -Pavan
>>>>
>>>> On Tue, Aug 7, 2018 at 12:22 PM Alexander Okonnikov <
>>>> alexander.okonnikov@gmail.com> wrote:
>>>>
>>>>> Hi Pavan,
>>>>>
>>>>>
>>>>> Regular RSVP-TE LSPs use standard RSVP path MTU discovery mechanism.
>>>>> That one cannot be used "as is" for approach described in the draft, =
and
>>>>> the draft doesn't address path MTU identification. Is it to be consid=
ered?
>>>>>
>>>>>
>>>>> Thank you.
>>>>>
>>>>> 26.07.2018 06:07, Vishnu Pavan Beeram =D0=BF=D0=B8=D1=88=D0=B5=D1=82:
>>>>>
>>>>> Chairs, Hi!
>>>>>
>>>>> As mentioned (in our presentation) in last week's WG session, we
>>>>> believe that the draft is sufficiently baked and ready to progress to=
 the
>>>>> next stage. We would like to formally request this draft to be consid=
ered
>>>>> for WG LC.
>>>>>
>>>>> Regards,
>>>>> - Pavan (on behalf of the authors)
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> mpls mailing listmpls@ietf.orghttps://www.ietf.org/mailman/listinfo/m=
pls
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> mpls mailing list
>>>>> mpls@ietf.org
>>>>> https://www.ietf.org/mailman/listinfo/mpls
>>>>>
>>>>
>>>>
>>>>
>>>
>>
>

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

<div dir=3D"ltr"><div>Alexander, Hi!</div><div><br></div><div>Please review=
 the latest version of the draft. We have left the use of segment routed by=
pass tunnels for further study. This should address your comment about the =
previous text being not precise enough.<br></div><div><br></div><div>Regard=
s,</div><div>-Pavan<br></div></div><br><div class=3D"gmail_quote"><div dir=
=3D"ltr">On Mon, Oct 1, 2018 at 4:29 AM Alexander Okonnikov &lt;<a href=3D"=
mailto:alexander.okonnikov@gmail.com">alexander.okonnikov@gmail.com</a>&gt;=
 wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8=
ex;border-left:1px #ccc solid;padding-left:1ex"><div style=3D"word-wrap:bre=
ak-word;line-break:after-white-space"><div>Hi Pavan,</div><div><br></div><d=
iv>The text proposed assumes that both kinds of bypass tunnels - regular an=
d segment-routed - can be used. But, if segment-routed one is used, it can =
cause re-election of delegation hops and re-signaling protected LSP. For ex=
ample, when segment-routed bypass tunnel has been rerouted, and its path le=
ngth has been changed, ETLD value will be modified.</div><div><br></div><di=
v>Hence, I think that description should be more precise - which kinds of b=
ypass tunnel are allowed for different kinds of segment-routed LSPs (w/o de=
legation hops, w/ explicit/automatic delegation hops), and what are procedu=
res for using them.</div><div><br></div><div>Thank you.</div><div><br><bloc=
kquote type=3D"cite"><div>27 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2=
 10:44, Vishnu Pavan Beeram &lt;<a href=3D"mailto:vishnupavan@gmail.com" ta=
rget=3D"_blank">vishnupavan@gmail.com</a>&gt; =D0=BD=D0=B0=D0=BF=D0=B8=D1=
=81=D0=B0=D0=BB(=D0=B0):</div><br class=3D"m_-8697369896937408904Apple-inte=
rchange-newline"><div><div dir=3D"ltr"><div style=3D"margin:0in 0in 0.0001p=
t;font-size:11pt;font-family:Calibri,sans-serif"><span>Alexander,
Hi!<span></span></span></div><p class=3D"MsoNormal" style=3D"margin:0in 0in=
 0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span>=
<span>=C2=A0</span></span></p><div style=3D"margin:0in 0in 0.0001pt;font-si=
ze:11pt;font-family:Calibri,sans-serif"><span>As you
have observed, the draft doesn=E2=80=99t preclude the use of shared labels =
for bypass
tunnels (when there is such a desire to do so). The intent of the text in S=
ection
5.3.1 (that you have highlighted) is to simply say that the ETLD processing=
 at
the ingress/delegation-hop MUST account for the bypass tunnel=E2=80=99s lab=
el(s). The
following update to the text should address your concern:<span></span></spa=
n></div><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:1=
1pt;font-family:&quot;Calibri&quot;,sans-serif"><span><span>=C2=A0</span></=
span></p><div style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:C=
alibri,sans-serif"><span style=3D"font-size:10pt;font-family:&quot;Courier =
New&quot;"><span>=C2=A0=C2=A0 </span>When an LSP that requests automatic
delegation also requests facility<span></span></span></div><div style=3D"ma=
rgin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span =
style=3D"font-size:10pt;font-family:&quot;Courier New&quot;"><span>=C2=A0=
=C2=A0 </span>backup protection [<a href=3D"https://tools.ietf.org/html/rfc=
4090" title=3D"&quot;Fast Reroute Extensions to RSVP-TE for LSP Tunnels&quo=
t;" target=3D"_blank"><span style=3D"color:blue">RFC4090</span></a>], the i=
ngress or the delegation hop MUST<span></span></span></div><div style=3D"ma=
rgin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span =
style=3D"font-size:10pt;font-family:&quot;Courier New&quot;"><span>=C2=A0=
=C2=A0 </span>account for the bypass tunnel&#39;s label(s)
when populating the ETLD.<span>=C2=A0 </span>Hence,<span></span></span></di=
v><div style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,=
sans-serif"><span style=3D"font-size:10pt;font-family:&quot;Courier New&quo=
t;"><span>=C2=A0=C2=A0 </span>when a regular bypass tunnel is used to
protect the facility, the ETLD <span></span></span></div><div style=3D"marg=
in:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span st=
yle=3D"font-size:10pt;font-family:&quot;Courier New&quot;"><span>=C2=A0=C2=
=A0 </span>that gets populated on these nodes is one
less than what gets populated <span></span></span></div><div style=3D"margi=
n:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span sty=
le=3D"font-size:10pt;font-family:&quot;Courier New&quot;"><span>=C2=A0=C2=
=A0 </span>for a corresponding unprotected LSP.<span></span></span></div><p=
 class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-f=
amily:&quot;Calibri&quot;,sans-serif"><span><span>=C2=A0</span></span></p><=
div style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,san=
s-serif"><span>Regards,<span></span></span></div><div style=3D"margin:0in 0=
in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span>-Pavan<spa=
n></span></span></div>





</div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Wed, Sep 26, 2018 =
at 10:44 AM Alexander Okonnikov &lt;<a href=3D"mailto:alexander.okonnikov@g=
mail.com" target=3D"_blank">alexander.okonnikov@gmail.com</a>&gt; wrote:<br=
></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-=
left:1px #ccc solid;padding-left:1ex"><div style=3D"word-wrap:break-word;li=
ne-break:after-white-space">Hi Pavan,<div><br></div><div>The fact that faci=
lity bypass LSP is being established according to RFC 4090 doesn&#39;t nece=
ssary mean that it itself cannot be shared segment RSVP-TE LSP. One can ass=
ume that the same approach is used for bypass tunnels too (to take benefits=
 of shared segment approach). And it could be, unless automatic delegation =
is used for some protected LSP.</div><div><br></div><div>Thank you.<br><div=
><br><blockquote type=3D"cite"><div>26 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=
=B3., =D0=B2 17:20, Vishnu Pavan Beeram &lt;<a href=3D"mailto:vishnupavan@g=
mail.com" target=3D"_blank">vishnupavan@gmail.com</a>&gt; =D0=BD=D0=B0=D0=
=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):</div><br class=3D"m_-86973698969374089=
04m_8165476047265226579Apple-interchange-newline"><div><div dir=3D"ltr"><di=
v dir=3D"ltr"><div>Alex, Hi!</div><div><br></div><div>Yes, the bypass tunne=
l (as indicated by the reference) referred to here is a regular RFC4090 byp=
ass tunnel.</div><div><br></div><div>Regards,</div><div>-Pavan<br></div><di=
v><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Tue, Sep 25, 2018 at 1=
1:43 AM Alexander Okonnikov &lt;<a href=3D"mailto:alexander.okonnikov@gmail=
.com" target=3D"_blank">alexander.okonnikov@gmail.com</a>&gt; wrote:<br></d=
iv><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bord=
er-left:1px solid rgb(204,204,204);padding-left:1ex"><div>Hi Pavan,<div><br=
></div><div>One question regarding ETLD. The draft says (section 5.3.1):</d=
iv><div><br></div><div><pre class=3D"m_-8697369896937408904m_81654760472652=
26579gmail-m_-4583328448852969928newpage" style=3D"font-size:13.3333px;marg=
in-top:0px;margin-bottom:0px">   When an LSP that requests automatic delega=
tion also requests facility
   backup protection [<a href=3D"https://tools.ietf.org/html/rfc4090" title=
=3D"&quot;Fast Reroute Extensions to RSVP-TE for LSP Tunnels&quot;" target=
=3D"_blank">RFC4090</a>], the ingress or the delegation hop MUST
   account for the bypass tunnel&#39;s label when populating the ETLD.  So,
   the ETLD that gets populated on these nodes is one less than what
   gets populated for a corresponding unprotected LSP.</pre><div><br></div>=
<div>I.e. is it assumed that bypass tunnel itself will be regular RSVP-TE L=
SP? Otherwise, if bypass LSP is signalled using shared labels approach, ETL=
D should be decreased for amount of label stack depth, imposed by this PLR =
(ingress or delegation hop) for bypass tunnel.</div><div><br></div><div>Tha=
nk you.</div><div><br><blockquote type=3D"cite"><div>16 =D1=81=D0=B5=D0=BD=
=D1=82. 2018 =D0=B3., =D0=B2 3:03, Vishnu Pavan Beeram &lt;<a href=3D"mailt=
o:vishnupavan@gmail.com" target=3D"_blank">vishnupavan@gmail.com</a>&gt; =
=D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):</div><br class=3D"m_-86=
97369896937408904m_8165476047265226579gmail-m_-4583328448852969928Apple-int=
erchange-newline"><div><div dir=3D"ltr"><div style=3D"margin:0in 0in 0.0001=
pt;font-size:11pt;font-family:Calibri,sans-serif"><span>Alexander,
Hi!<span></span></span></div><p class=3D"MsoNormal" style=3D"margin:0in 0in=
 0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span>=
<span>=C2=A0</span></span></p><div style=3D"margin:0in 0in 0.0001pt;font-si=
ze:11pt;font-family:Calibri,sans-serif"><span>Much
Thanks for the review comments. Please keep them coming.<span></span></span=
></div><div style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:Cal=
ibri,sans-serif"><span>Please
see inline for responses (prefixed VPB).<span></span></span></div><p class=
=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:=
&quot;Calibri&quot;,sans-serif"><span><span>=C2=A0</span></span></p><div st=
yle=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-seri=
f"><span>Regards,<span></span></span></div><div style=3D"margin:0in 0in 0.0=
001pt;font-size:11pt;font-family:Calibri,sans-serif"><span>-Pavan<span></sp=
an></span></div>





<br><span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;"><spa=
n></span></span>





<br><div class=3D"gmail_quote"><div dir=3D"ltr">On Thu, Sep 13, 2018 at 1:2=
8 PM Alexander Okonnikov &lt;<a href=3D"mailto:alexander.okonnikov@gmail.co=
m" target=3D"_blank">alexander.okonnikov@gmail.com</a>&gt; wrote:<br></div>=
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex"><div>Hi Panav,<div><br></=
div><div><div>Questions regarding ETLD:</div><div><br></div><div>The draft =
is not clear about signaling of ETLD attribute. It says that ETLD is convey=
ed as per-hop attribute. Is my understanding correct that it is conveyed as=
 RRO Hop attribute? Probably it could be cleaned to avoid confusion whether=
 ERO or RRO Hop attribute mechanism is used.</div></div></div></blockquote>=
<div><br></div><div><div style=3D"margin:0in 0in 0.0001pt;font-size:11pt;fo=
nt-family:Calibri,sans-serif"><span>[VPB] The
ETLD specific protocol extensions are discussed in Section 9.7. This sectio=
n
clearly states that the ETLD TLV is carried in the HOP_ATTRIBUTES subobject=
 of
an RRO object in the Path message. That said, the following tweak to the te=
xt
in Section 5.3.1 should address your comment:<span></span></span></div><p c=
lass=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-fam=
ily:&quot;Calibri&quot;,sans-serif"><span><span>=C2=A0</span></span></p><di=
v style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-=
serif"><span>OLD:<span></span></span></div><div style=3D"margin:0in 0in 0.0=
001pt;font-size:11pt;font-family:Calibri,sans-serif"><span style=3D"font-si=
ze:10pt;font-family:&quot;Courier New&quot;">The
ETLD is signaled as a per-hop attribute in the Path message [<a href=3D"htt=
ps://tools.ietf.org/html/rfc7570" title=3D"&quot;Label Switched Path (LSP) =
Attribute in the Explicit Route Object (ERO)&quot;" target=3D"_blank"><span=
 style=3D"color:blue">RFC7570</span></a>].<span></span></span></div><p clas=
s=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family=
:&quot;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-family:=
&quot;Courier New&quot;"><span>=C2=A0</span></span></p><div style=3D"margin=
:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span>NEW:=
<span></span></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:1=
1pt;font-family:Calibri,sans-serif"><span style=3D"font-size:10pt;font-fami=
ly:&quot;Courier New&quot;">The
ETLD is signaled as a per-hop recorded attribute in the Path message [<a hr=
ef=3D"https://tools.ietf.org/html/rfc7570" title=3D"&quot;Label Switched Pa=
th (LSP) Attribute in the Explicit Route Object (ERO)&quot;" target=3D"_bla=
nk"><span style=3D"color:blue">RFC7570</span></a>].<span></span></span></di=
v><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif"><span><span>=C2=A0</span></span><=
/p>=C2=A0





<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8=
ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div><div>=
<br></div><div>Next, the draft says that:</div><div><br></div><div><span cl=
ass=3D"m_-8697369896937408904m_8165476047265226579gmail-m_-4583328448852969=
928m_-3476666688711270356Apple-tab-span" style=3D"white-space:pre-wrap">	</=
span>&quot;... If a node is reached where the ETLD set from the previous ho=
p is 1, then that</div><div><span class=3D"m_-8697369896937408904m_81654760=
47265226579gmail-m_-4583328448852969928m_-3476666688711270356Apple-tab-span=
" style=3D"white-space:pre-wrap">	</span>node MUST select itself as the del=
egation hop.=C2=A0 If a node is reached and it is=C2=A0</div><div><span cla=
ss=3D"m_-8697369896937408904m_8165476047265226579gmail-m_-45833284488529699=
28m_-3476666688711270356Apple-tab-span" style=3D"white-space:pre-wrap">	</s=
pan>determined that this hop cannot receive more than one transport label, =
then that node=C2=A0</div><div><span class=3D"m_-8697369896937408904m_81654=
76047265226579gmail-m_-4583328448852969928m_-3476666688711270356Apple-tab-s=
pan" style=3D"white-space:pre-wrap">	</span>MUST select itself as the deleg=
ation hop. ...&quot;</div><div><br></div><div>What is purpose of the second=
 sentence/rule?</div></div></div></blockquote><div><br></div><div><div styl=
e=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"=
><span>[VPB] Selecting
oneself as a delegation hop ensures that the incoming packet will not carry=
 more
than one transport label. The second sentence above was added to let
the transit node have the ability to influence the delegation decision if i=
t
ran into some local policy/limitation that prevented it from receiving more
than one transport label. As an alternative, the transit node may decide to=
 choose
a regular swap label in such scenarios and let some downstream node be the =
delegation
hop.<span></span></span></div>=C2=A0





<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8=
ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div><div>=
<br></div><div>Next:</div><div><br></div><div><span class=3D"m_-86973698969=
37408904m_8165476047265226579gmail-m_-4583328448852969928m_-347666668871127=
0356Apple-tab-span" style=3D"white-space:pre-wrap">	</span>&quot;If there i=
s a node or a sequence of nodes along the path of the LSP that do not=C2=A0=
</div><div><span class=3D"m_-8697369896937408904m_8165476047265226579gmail-=
m_-4583328448852969928m_-3476666688711270356Apple-tab-span" style=3D"white-=
space:pre-wrap">	</span>support ETLD, then the immediate hop that supports =
ETLD MUST select itself as the=C2=A0</div><div><span class=3D"m_-8697369896=
937408904m_8165476047265226579gmail-m_-4583328448852969928m_-34766666887112=
70356Apple-tab-span" style=3D"white-space:pre-wrap">	</span>delegation hop.=
&quot;</div><div><br></div><div>If some node (consecutive nodes) doesn&#39;=
t support ETLD then it doesn&#39;t support TE labels. Hence, that node (reg=
ular RSVP-TE LSR) will do SWAP and not POP. As a result non-decremented ETL=
D is OK and immediate hop that supports ETLD not necessary should become de=
legation hop?</div><div><br></div></div></div></blockquote><div><br></div><=
div><div style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibr=
i,sans-serif"><span>[VPB] If
an intermediate transit node doesn=E2=80=99t support ETLD, it will not reco=
rd ETLD for
that hop. The immediate hop that supports ETLD will realize that the previo=
us
hop doesn=E2=80=99t support ETLD (no recording available for the previous h=
op) and designates itself as a
delegation hop.<span></span></span></div>

</div><div>=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0p=
x 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><d=
iv><div><div></div><div>Also, from Section 9.7:</div><div><br></div><div>&q=
uot;The ETLD field specifies the maximum number of transport labels that th=
is hop can potentially send to its downstream hop.=C2=A0 It MUST be set to =
a non-zero value.&quot;</div><div><br></div><div>Strictly speaking it is no=
t correct. ETLD reflects decrementing counter and not capability of some tr=
ansit node. I.e. if we consider LSP R1-R2-R3, R1 puts value 5 in ETLD,and R=
2 supports imposing of 2 labels, it doesn&#39;t mean that R2 should rewrite=
 ETLD with value 2. It just should decrement value 5. Correct?</div><div><b=
r></div></div></div></blockquote><div><br></div><div><div style=3D"margin:0=
in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span>[VPB] =
I
agree that the above sentence can read better. The intent was to say =E2=80=
=93 =E2=80=9Cthe maximum
number of transport labels that the hop can send in relation to its positio=
n in
the path=E2=80=9D. The following tweak to the sentence should address your =
concern:<span></span></span></div><p class=3D"MsoNormal" style=3D"margin:0i=
n 0in 0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><=
span><span>=C2=A0</span></span></p><div style=3D"margin:0in 0in 0.0001pt;fo=
nt-size:11pt;font-family:Calibri,sans-serif"><span>OLD:<span></span></span>=
</div><div style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:Cali=
bri,sans-serif"><span style=3D"font-size:10pt;font-family:&quot;Courier New=
&quot;">The
ETLD field specifies the maximum number of transport labels that this hop c=
an
potentially send to its downstream hop.<span></span></span></div><p class=
=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:=
&quot;Calibri&quot;,sans-serif"><span><span>=C2=A0</span></span></p><div st=
yle=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-seri=
f"><span>NEW:<span></span></span></div><div style=3D"margin:0in 0in 0.0001p=
t;font-size:11pt;font-family:Calibri,sans-serif"><span style=3D"font-size:1=
0pt;font-family:&quot;Courier New&quot;">The
ETLD field specifies the effective number of transport labels that this hop=
 (in
relation to its position in the path) can potentially send to its downstrea=
m
hop.<span></span></span></div><p class=3D"MsoNormal" style=3D"margin:0in 0i=
n 0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span=
><span>=C2=A0</span></span></p>=C2=A0





<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8=
ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div><div>=
</div><div>Also, per my understanding it is supposed that in fact ETLD valu=
e will not be just decremented, but it will be copied from previous RRO Hop=
 attributes subobject into being inserted RRO Hop attributes subobject with=
 decrementing. May be it would be better to signal ETLD value in LSP Attrib=
utes object (and each capable node decrements ETLD value there), while sign=
aling support of ETLD itself in RRO Hop attributes subobject?</div><div><br=
></div></div></div></blockquote><div><br></div><div><div style=3D"margin:0i=
n 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span>[VPB] T=
he
authors did consider the alternative protocol extensions that you have
specified above. We decided to use the current encoding in the draft becaus=
e there was no
good reason to get 2 code-points for ETLD when the same objective could be
achieved with one code-point.<span></span></span></div>

</div><div>=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0p=
x 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><d=
iv><div><div></div><div>Thank you.</div><div><br><blockquote type=3D"cite">=
<div>13 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 20:22, Alexander Oko=
nnikov &lt;<a href=3D"mailto:alexander.okonnikov@gmail.com" target=3D"_blan=
k">alexander.okonnikov@gmail.com</a>&gt; =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=
=B0=D0=BB(=D0=B0):</div><br class=3D"m_-8697369896937408904m_81654760472652=
26579gmail-m_-4583328448852969928m_-3476666688711270356Apple-interchange-ne=
wline"><div><div><div>Hi Pavan,</div><div><br></div><div>I&#39;m sorry for =
delay with answer.</div><div><br></div><div>If ingress uses regular Path MT=
U discovery mechanism, it could produce value of MTU lower than actual one.=
 This is because ingress doesn&#39;t know MTU per each hop. Let&#39;s consi=
der case with four routers: R1 - R2 - R3 - R4. MTU for R1-R2 link is 2000, =
MTU for R2-R3 is 1600 and MTU for R3-R4 is 2000. By virtue of regular Path =
MTU discovery mechanism R1 will derive from FLOWSPEC that path MTU is 1600.=
 As soon as R1 doesn&#39;t know how many labels in the stack will be on the=
 lowest MTU hop, it can only set LSP MTU to most conservative value (1600 -=
 4 - 4 =3D 1592, provided that R4 has advertised implicit null label). In f=
act actual path MTU is 1596 (1600 - 4 on R2-R3 hop). Of course, it could be=
 acceptable, but calculated LSP MTU as more lower than actual as longer LSP=
 path. For correct path MTU discovery ingress needs to know MTU per each ho=
p.</div><div><br></div><div>Thank you.</div><div><br><blockquote type=3D"ci=
te"><div>6 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 18:27, Vishnu Pav=
an Beeram &lt;<a href=3D"mailto:vishnupavan@gmail.com" target=3D"_blank">vi=
shnupavan@gmail.com</a>&gt; =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=
=B0):</div><br class=3D"m_-8697369896937408904m_8165476047265226579gmail-m_=
-4583328448852969928m_-3476666688711270356Apple-interchange-newline"><div><=
div dir=3D"ltr"><div dir=3D"ltr">Alexander, Hi!<br>=C2=A0<br>I apologize fo=
r the delayed response.<br>=C2=A0<br>This draft does not propose any change=
s to the standard RSVP MTU signaling procedures (Int Serv object specific s=
ignaling procedures). After the initial signaling sequence is complete, an =
ingress implementation (RFC3209) would typically take the path MTU learnt v=
ia signaling, run it through some local logic and then arrive at an MTU val=
ue that can be assigned to the LSP. This local logic typically involves ded=
ucting the number of bytes in the label stack used for the LSP from the pat=
h MTU learnt via signaling. The ingress implementation supporting this draf=
t will rely on the Resv RRO to accurately determine the max-number of label=
s pushed along the path of the LSP (note that with delegation, downstream h=
ops can impose label stacks) and account for it in the local logic used to =
arrive at the MTU value assigned to the LSP.<br>=C2=A0<br>I hope this addre=
sses your question.<br>=C2=A0<br>Regards,<br>-Pavan<br></div></div><br><div=
 class=3D"gmail_quote"><div dir=3D"ltr">On Tue, Aug 7, 2018 at 12:22 PM Ale=
xander Okonnikov &lt;<a href=3D"mailto:alexander.okonnikov@gmail.com" targe=
t=3D"_blank">alexander.okonnikov@gmail.com</a>&gt; wrote:<br></div><blockqu=
ote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px=
 solid rgb(204,204,204);padding-left:1ex">
 =20
   =20
 =20
  <div bgcolor=3D"#FFFFFF"><p>Hi Pavan,</p><p><br>
    </p><p>Regular RSVP-TE LSPs use standard RSVP path MTU discovery
      mechanism. That one cannot be used &quot;as is&quot; for approach des=
cribed
      in the draft, and the draft doesn&#39;t address path MTU
      identification. Is it to be considered?<br>
    </p><p><br>
    </p><p>Thank you.<br>
    </p>
    <br>
    <div class=3D"m_-8697369896937408904m_8165476047265226579gmail-m_-45833=
28448852969928m_-3476666688711270356m_-6153622752759840168moz-cite-prefix">=
26.07.2018 06:07, Vishnu Pavan Beeram
      =D0=BF=D0=B8=D1=88=D0=B5=D1=82:<br>
    </div>
    <blockquote type=3D"cite">
     =20
      <div dir=3D"ltr">
        <div>Chairs, Hi!</div>
        <div><br>
        </div>
        <div>As mentioned (in our presentation) in last week&#39;s WG
          session, we believe that the draft is sufficiently baked and
          ready to progress to the next stage. We would like to formally
          request this draft to be considered for WG LC.<br>
        </div>
        <div><br>
        </div>
        <div>Regards,</div>
        <div>- Pavan (on behalf of the authors)<br>
        </div>
      </div>
      <br>
      <fieldset class=3D"m_-8697369896937408904m_8165476047265226579gmail-m=
_-4583328448852969928m_-3476666688711270356m_-6153622752759840168mimeAttach=
mentHeader"></fieldset>
      <br>
      <pre>_______________________________________________
mpls mailing list
<a class=3D"m_-8697369896937408904m_8165476047265226579gmail-m_-45833284488=
52969928m_-3476666688711270356m_-6153622752759840168moz-txt-link-abbreviate=
d" href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a>
<a class=3D"m_-8697369896937408904m_8165476047265226579gmail-m_-45833284488=
52969928m_-3476666688711270356m_-6153622752759840168moz-txt-link-freetext" =
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</pre>
    </blockquote>
    <br>
  </div>

_______________________________________________<br>
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</blockquote></div>
</div></blockquote></div><br></div></div></blockquote></div><br></div></div=
></blockquote></div></div>
</div></blockquote></div><br></div></div></blockquote></div></div></div></d=
iv>
</div></blockquote></div><br></div></div></blockquote></div>
</div></blockquote></div><br></div></blockquote></div>

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From: Vishnu Pavan Beeram <vishnupavan@gmail.com>
Date: Mon, 8 Oct 2018 15:30:48 -0400
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Cc: IETF MPLS List <mpls@ietf.org>, mhartley.ietf@gmail.com
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Subject: Re: [mpls] Requesting WG LC for draft-ietf-mpls-rsvp-shared-labels
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Alexander, Hi!

There isn't any strong reason to strip link protection out of this
document.

In our (authors) opinion, this base draft is sufficiently baked for an
implementation to adopt and deliver a deployable solution. Please note that
there are network deployments out there that don=E2=80=99t have node-protec=
tion
turned on. Our preference would be to progress the base draft without any
references to the node protection draft and let the node protection draft
go through the WG process independently (take the natural course). The
procedures in draft-chandra-mpls-rsvp-shared-labels-np  are fully backwards
compatible with the procedures discussed in the base draft.

Regards,
-Pavan (on behalf of the authors)


On Mon, Oct 1, 2018 at 5:54 AM Alexander Okonnikov <
alexander.okonnikov@gmail.com> wrote:

> Hi Pavan,
>
> Maybe it would be better to take out FRR link-protection description from
> this draft to draft-chandra-mpls-rsvp-shared-labels-np. Like we have RFC
> 3209 and RFC 4090 that describe RSVP-TE LSP and FRR for RSVP-TE LSP,
> respectively.
>
> Thank you.
>
> 27 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 17:47, Matt Hartley <mh=
artley.ietf@gmail.com>
> =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):
>
> Pavan,
>
> OK. That's reasonable, but it might be worth adding a line to the draft t=
o
> say so.
>
> Cheers
>
> Matt
>
> On Thu, Sep 27, 2018 at 4:30 AM Vishnu Pavan Beeram <vishnupavan@gmail.co=
m>
> wrote:
>
>> Matt, Hi!
>>
>>
>> The purpose of this document is to provide a mechanism to bring up MPLS
>> RSVP-TE LSPs on a shared forwarding plane. There is a set of key RSVP-TE
>> features/functionalities specified in the Introduction Section that woul=
d continue
>> to work with this forwarding plane (without needing any special
>> extensions). The authors believe that a deployable solution can be
>> implemented with this set of features/functionalities.
>>
>>
>> If there are any other desirable features/functionalities (that are not
>> specified as supported in this document) that can be supported on this
>> forwarding plane by introducing a few protocol extensions, then those ar=
e
>> expected to be discussed separately
>> (draft-chandra-mpls-rsvp-shared-labels-np is an example of that).
>>
>>
>> Regards,
>> -Pavan
>>
>> On Wed, Sep 26, 2018 at 10:56 AM Matt Hartley <mhartley.ietf@gmail.com>
>> wrote:
>>
>>> Pavan,
>>>
>>> The problem with lists like this (in general) is that it's not clear
>>> what the status is for anything that isn't on the list, and most lists =
will
>>> probably manage to omit *something*. I think there's three reasonable
>>> options:
>>>
>>> 1. State unequivocally that everything works
>>> 2. List the functionalities that definitely don't work, and make it
>>> clear that everything else does
>>> 3. List the functionalities that definitely work, and explicitly make n=
o
>>> guarantees about anything that isn't listed.
>>>
>>> It isn't really clear what you're trying to do here.
>>>
>>> Note that in this case option 1 isn't on the table because we've alread=
y
>>> established that nnhop FRR requires further extensions.
>>>
>>> Cheers
>>>
>>> Matt
>>>
>>> On Wed, Sep 26, 2018 at 10:17 AM Vishnu Pavan Beeram <
>>> vishnupavan@gmail.com> wrote:
>>>
>>>> Alexander Hi!
>>>>
>>>>
>>>> The intent of the following statement in Section 1 is certainly not to
>>>> be evasive (slightly or otherwise).
>>>>    Functionalities such as bandwidth admission control, LSP
>>>>    priorities, preemption, auto-bandwidth and Fast Reroute
>>>>    continue to work with this forwarding plane.
>>>>
>>>>
>>>> We (the authors) still don=E2=80=99t see any problem with the above st=
atement.
>>>> But we=E2=80=99ll go ahead and make a slight adjustment (see below) to=
 address your
>>>> concern.
>>>>    Key functionalities such as bandwidth admission control, LSP
>>>>    priorities, preemption, auto-bandwidth and Fast Reroute via
>>>>    facility backup protection continue to work with this
>>>>    forwarding plane.
>>>>
>>>>
>>>> Regards,
>>>> -Pavan
>>>>
>>>>
>>>> On Tue, Sep 25, 2018 at 11:34 AM Alexander Okonnikov <
>>>> alexander.okonnikov@gmail.com> wrote:
>>>>
>>>>> Hi Panav,
>>>>>
>>>>> Ok, 1:1 is not to be supported by this approach. In general, 1:1 has
>>>>> its own benefits  - for example, it is more attractive versus N:1 in =
ring
>>>>> topologies. After all, it is FRR too, as N:1 one. My point was that
>>>>> description in section 1 is slightly evasive regarding FRR and other
>>>>> RSVP-TE properties (PMTUD).
>>>>>
>>>>> Thank you.
>>>>>
>>>>>
>>>>> 16 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 4:38, Vishnu Pavan =
Beeram <vishnupavan@gmail.com>
>>>>> =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):
>>>>>
>>>>> Alexander, Hi!
>>>>>
>>>>>
>>>>> Please see inline for responses (prefixed VPB).
>>>>>
>>>>>
>>>>> Regards,
>>>>> -Pavan
>>>>>
>>>>> On Thu, Sep 13, 2018 at 1:37 PM Alexander Okonnikov <
>>>>> alexander.okonnikov@gmail.com> wrote:
>>>>>
>>>>>> Hi Panav,
>>>>>>
>>>>>> From section 7:
>>>>>>
>>>>>>
>>>>>> "If the label type is a delegation label, then the stacking procedur=
e
>>>>>> stops at that delegation hop."
>>>>>> It is OK for "Stack to Reach Delegation Hop" approach, but it doesn'=
t
>>>>>> work for "Stack to Reach Egress", isn't it?
>>>>>>
>>>>>
>>>>> [VPB] The logic specified in Section 7 could be used by any node
>>>>> constructing the label stack (this could be the ingress or a delegati=
on
>>>>> hop). The sentence immediately following the above quoted sentence in
>>>>> Section 7 is important. It currently reads =E2=80=93
>>>>> Approaches in Section 5.1
>>>>> <https://tools.ietf.org/html/draft-ietf-mpls-rsvp-shared-labels-03#se=
ction-5.1>
>>>>> SHOULD be used to determine how the delegation labels are pushed in t=
he
>>>>> label stack.
>>>>>
>>>>>
>>>>> The intent here is to say that if you encounter a delegation label,
>>>>> use the procedures outlined in Section 5.1 to determine how the deleg=
ation
>>>>> labels are pushed in the label stack. The following change to the tex=
t
>>>>> should address this comment:
>>>>>
>>>>> OLD:
>>>>>
>>>>> If the label type is a delegation label, then the stacking procedure =
stops at that delegation hop.
>>>>> Approaches in Section 5.1 <https://tools.ietf.org/html/draft-ietf-mpl=
s-rsvp-shared-labels-03#section-5.1> SHOULD be used to determine how the de=
legation labels are pushed in the label stack.
>>>>>
>>>>>
>>>>> NEW:
>>>>> If the label type is a delegation label, then the type of stacking
>>>>> approach chosen by the ingress for this LSP (Section 5.1) MUST be use=
d to
>>>>> determine how the delegation labels are pushed in the label stack.
>>>>>
>>>>>
>>>>>
>>>>>>
>>>>>> Also, regarding FRR support. Section 1 says:
>>>>>>
>>>>>> "Functionalities such as bandwidth admission control, LSP priorities=
,
>>>>>> preemption,
>>>>>> auto-bandwidth and Fast Reroute continue to work with this forwardin=
g
>>>>>> plane."
>>>>>> It seems that shared labels approach supports only facility bypass
>>>>>> link-protection. It doesn't support one-to-one link- and node-protec=
tion,
>>>>>> per my understanding. Facility bypass node-protection is not support=
ed as
>>>>>> well (as mentioned in Section 8). Hence, FRR support is very limited=
, and
>>>>>> section 1 needs correction.
>>>>>>
>>>>>
>>>>> [VPB] I don=E2=80=99t see anything wrong with the quoted text. Fast R=
eroute
>>>>> for MPLS-TE LSPs can be realized by either the 1-to-1 protection mech=
anism
>>>>> (detours) or the facility bypass mechanism. The authors don=E2=80=99t=
 intend to add
>>>>> procedures for 1-to-1 link/node protection (who needs it?).  The
>>>>> facility bypass link-protection procedure is discussed in this draft.=
 The
>>>>> facility bypass node-protection procedure is discussed in
>>>>> https://tools.ietf.org/html/draft-chandra-mpls-rsvp-shared-labels-np-=
00
>>>>> (this was presented at the last IETF).
>>>>>
>>>>>
>>>>>>
>>>>>> Thank you.
>>>>>>
>>>>>> 13 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 20:28, Alexander O=
konnikov <
>>>>>> alexander.okonnikov@gmail.com> =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=
=D0=BB(=D0=B0):
>>>>>>
>>>>>> Hi Panav,
>>>>>>
>>>>>> Questions regarding ETLD:
>>>>>>
>>>>>> The draft is not clear about signaling of ETLD attribute. It says
>>>>>> that ETLD is conveyed as per-hop attribute. Is my understanding corr=
ect
>>>>>> that it is conveyed as RRO Hop attribute? Probably it could be clean=
ed to
>>>>>> avoid confusion whether ERO or RRO Hop attribute mechanism is used.
>>>>>>
>>>>>> Next, the draft says that:
>>>>>>
>>>>>> "... If a node is reached where the ETLD set from the previous hop i=
s
>>>>>> 1, then that
>>>>>> node MUST select itself as the delegation hop.  If a node is reached
>>>>>> and it is
>>>>>> determined that this hop cannot receive more than one transport
>>>>>> label, then that node
>>>>>> MUST select itself as the delegation hop. ..."
>>>>>>
>>>>>> What is purpose of the second sentence/rule?
>>>>>>
>>>>>> Next:
>>>>>>
>>>>>> "If there is a node or a sequence of nodes along the path of the LSP
>>>>>> that do not
>>>>>> support ETLD, then the immediate hop that supports ETLD MUST select
>>>>>> itself as the
>>>>>> delegation hop."
>>>>>>
>>>>>> If some node (consecutive nodes) doesn't support ETLD then it doesn'=
t
>>>>>> support TE labels. Hence, that node (regular RSVP-TE LSR) will do SW=
AP and
>>>>>> not POP. As a result non-decremented ETLD is OK and immediate hop th=
at
>>>>>> supports ETLD not necessary should become delegation hop?
>>>>>>
>>>>>> Also, from Section 9.7:
>>>>>>
>>>>>> "The ETLD field specifies the maximum number of transport labels tha=
t
>>>>>> this hop can potentially send to its downstream hop.  It MUST be set=
 to a
>>>>>> non-zero value."
>>>>>>
>>>>>> Strictly speaking it is not correct. ETLD reflects decrementing
>>>>>> counter and not capability of some transit node. I.e. if we consider=
 LSP
>>>>>> R1-R2-R3, R1 puts value 5 in ETLD,and R2 supports imposing of 2 labe=
ls, it
>>>>>> doesn't mean that R2 should rewrite ETLD with value 2. It just shoul=
d
>>>>>> decrement value 5. Correct?
>>>>>>
>>>>>> Also, per my understanding it is supposed that in fact ETLD value
>>>>>> will not be just decremented, but it will be copied from previous RR=
O Hop
>>>>>> attributes subobject into being inserted RRO Hop attributes subobjec=
t with
>>>>>> decrementing. May be it would be better to signal ETLD value in LSP
>>>>>> Attributes object (and each capable node decrements ETLD value there=
),
>>>>>> while signaling support of ETLD itself in RRO Hop attributes subobje=
ct?
>>>>>>
>>>>>> Thank you.
>>>>>>
>>>>>> 13 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 20:22, Alexander O=
konnikov <
>>>>>> alexander.okonnikov@gmail.com> =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=
=D0=BB(=D0=B0):
>>>>>>
>>>>>> Hi Pavan,
>>>>>>
>>>>>> I'm sorry for delay with answer.
>>>>>>
>>>>>> If ingress uses regular Path MTU discovery mechanism, it could
>>>>>> produce value of MTU lower than actual one. This is because ingress =
doesn't
>>>>>> know MTU per each hop. Let's consider case with four routers: R1 - R=
2 - R3
>>>>>> - R4. MTU for R1-R2 link is 2000, MTU for R2-R3 is 1600 and MTU for =
R3-R4
>>>>>> is 2000. By virtue of regular Path MTU discovery mechanism R1 will d=
erive
>>>>>> from FLOWSPEC that path MTU is 1600. As soon as R1 doesn't know how =
many
>>>>>> labels in the stack will be on the lowest MTU hop, it can only set L=
SP MTU
>>>>>> to most conservative value (1600 - 4 - 4 =3D 1592, provided that R4 =
has
>>>>>> advertised implicit null label). In fact actual path MTU is 1596 (16=
00 - 4
>>>>>> on R2-R3 hop). Of course, it could be acceptable, but calculated LSP=
 MTU as
>>>>>> more lower than actual as longer LSP path. For correct path MTU disc=
overy
>>>>>> ingress needs to know MTU per each hop.
>>>>>>
>>>>>> Thank you.
>>>>>>
>>>>>> 6 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 18:27, Vishnu Pavan=
 Beeram <vishnupavan@gmail.com>
>>>>>> =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):
>>>>>>
>>>>>> Alexander, Hi!
>>>>>>
>>>>>> I apologize for the delayed response.
>>>>>>
>>>>>> This draft does not propose any changes to the standard RSVP MTU
>>>>>> signaling procedures (Int Serv object specific signaling procedures)=
. After
>>>>>> the initial signaling sequence is complete, an ingress implementatio=
n
>>>>>> (RFC3209) would typically take the path MTU learnt via signaling, ru=
n it
>>>>>> through some local logic and then arrive at an MTU value that can be
>>>>>> assigned to the LSP. This local logic typically involves deducting t=
he
>>>>>> number of bytes in the label stack used for the LSP from the path MT=
U
>>>>>> learnt via signaling. The ingress implementation supporting this dra=
ft will
>>>>>> rely on the Resv RRO to accurately determine the max-number of label=
s
>>>>>> pushed along the path of the LSP (note that with delegation, downstr=
eam
>>>>>> hops can impose label stacks) and account for it in the local logic =
used to
>>>>>> arrive at the MTU value assigned to the LSP.
>>>>>>
>>>>>> I hope this addresses your question..
>>>>>>
>>>>>> Regards,
>>>>>> -Pavan
>>>>>>
>>>>>> On Tue, Aug 7, 2018 at 12:22 PM Alexander Okonnikov <
>>>>>> alexander.okonnikov@gmail.com> wrote:
>>>>>>
>>>>>>> Hi Pavan,
>>>>>>>
>>>>>>>
>>>>>>> Regular RSVP-TE LSPs use standard RSVP path MTU discovery mechanism=
.
>>>>>>> That one cannot be used "as is" for approach described in the draft=
, and
>>>>>>> the draft doesn't address path MTU identification. Is it to be cons=
idered?
>>>>>>>
>>>>>>>
>>>>>>> Thank you.
>>>>>>>
>>>>>>> 26.07.2018 06:07, Vishnu Pavan Beeram =D0=BF=D0=B8=D1=88=D0=B5=D1=
=82:
>>>>>>>
>>>>>>> Chairs, Hi!
>>>>>>>
>>>>>>> As mentioned (in our presentation) in last week's WG session, we
>>>>>>> believe that the draft is sufficiently baked and ready to progress =
to the
>>>>>>> next stage. We would like to formally request this draft to be cons=
idered
>>>>>>> for WG LC.
>>>>>>>
>>>>>>> Regards,
>>>>>>> - Pavan (on behalf of the authors)
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> mpls mailing listmpls@ietf.orghttps://www.ietf.org/mailman/listinfo=
/mpls
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> 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
>>>>
>>>
>

--0000000000004bc7510577bca91b
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><div>Alexander, Hi!</div><div><br></div><=
div>There isn&#39;t any strong reason to strip link protection out of this =
document. <br></div><div><br></div><div>In our (authors) opinion, this base=
 draft is sufficiently baked for an implementation to adopt and deliver a d=
eployable solution. Please note that there are network deployments out ther=
e that don=E2=80=99t have node-protection turned on. Our preference would b=
e to progress the base draft without any references to the node protection =
draft and let the node protection draft go through the WG process independe=
ntly (take the natural course). The procedures in draft-chandra-mpls-rsvp-s=
hared-labels-np=C2=A0 are fully backwards compatible with the procedures di=
scussed in the base draft. <br></div><div><br></div><div>Regards,</div><div=
>-Pavan (on behalf of the authors)</div><div><br></div></div></div><br><div=
 class=3D"gmail_quote"><div dir=3D"ltr">On Mon, Oct 1, 2018 at 5:54 AM Alex=
ander Okonnikov &lt;<a href=3D"mailto:alexander.okonnikov@gmail.com">alexan=
der.okonnikov@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_=
quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1=
ex"><div style=3D"word-wrap:break-word;line-break:after-white-space">Hi Pav=
an,<div><br></div><div>Maybe it would be better to take out FRR link-protec=
tion description from this draft to=C2=A0<span style=3D"font-size:1em">draf=
t-chandra-mpls-rsvp-shared-labels-np. Like we have RFC 3209 and RFC 4090 th=
at describe RSVP-TE LSP and FRR for RSVP-TE LSP, respectively.</span></div>=
<div><span style=3D"font-size:1em"><br></span></div><div><span style=3D"fon=
t-size:1em">Thank you.</span></div><div><br><blockquote type=3D"cite"><div>=
27 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 17:47, Matt Hartley &lt;<=
a href=3D"mailto:mhartley.ietf@gmail.com" target=3D"_blank">mhartley.ietf@g=
mail.com</a>&gt; =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):</div><=
br class=3D"m_-297057523195160134Apple-interchange-newline"><div><div dir=
=3D"ltr"><div>Pavan,</div><div><br></div><div>OK. That&#39;s reasonable, bu=
t it might be worth adding a line to the draft to say so.</div><div><br></d=
iv><div>Cheers</div><div><br></div><div>Matt<br></div></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr">On Thu, Sep 27, 2018 at 4:30 AM Vishnu Pa=
van Beeram &lt;<a href=3D"mailto:vishnupavan@gmail.com" target=3D"_blank">v=
ishnupavan@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quo=
te" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"=
><div dir=3D"ltr"><div style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:Calibri,sans-serif"><span>Matt,
Hi!<span></span></span></div><p class=3D"MsoNormal" style=3D"margin:0in 0in=
 0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span>=
<span>=C2=A0</span></span></p><div style=3D"margin:0in 0in 0.0001pt;font-si=
ze:11pt;font-family:Calibri,sans-serif"><span>The
purpose of this document is to provide a mechanism to bring up MPLS RSVP-TE=
 LSPs on a shared forwarding plane. There is a set of key RSVP-TE features/=
functionalities
specified in the Introduction Section that would <span></span>continue to w=
ork with this forwarding plane
(without needing any special extensions). The authors believe that a deploy=
able
solution can be implemented with this set of features/functionalities. <spa=
n></span></span></div><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001=
pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span><span>=
=C2=A0</span></span></p><div style=3D"margin:0in 0in 0.0001pt;font-size:11p=
t;font-family:Calibri,sans-serif"><span>If there
are any other desirable features/functionalities (that are not specified as
supported in this document) that can be supported on this forwarding plane =
by introducing a few protocol extensions, then those are expected to be dis=
cussed separately
(draft-chandra-mpls-rsvp-shared-labels-np is an example of that).<span></sp=
an></span></div><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;fon=
t-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span><span>=C2=A0<=
/span></span></p><div style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-=
family:Calibri,sans-serif"><span>Regards,<span></span></span></div><div sty=
le=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif=
"><span>-Pavan<span></span></span></div>





</div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Wed, Sep 26, 2018 =
at 10:56 AM Matt Hartley &lt;<a href=3D"mailto:mhartley.ietf@gmail.com" tar=
get=3D"_blank">mhartley.ietf@gmail.com</a>&gt; wrote:<br></div><blockquote =
class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid=
;padding-left:1ex"><div dir=3D"ltr"><div>Pavan,</div><div><br></div><div>Th=
e problem with lists like this (in general) is that it&#39;s not clear what=
 the status is for anything that isn&#39;t on the list, and most lists will=
 probably manage to omit *something*. I think there&#39;s three reasonable =
options:</div><div><br></div><div>1. State unequivocally that everything wo=
rks</div><div>2. List the functionalities that definitely don&#39;t work, a=
nd make it clear that everything else does<br></div><div>3. List the functi=
onalities that definitely work, and explicitly make no guarantees about any=
thing that isn&#39;t listed.</div><div><br></div><div>It isn&#39;t really c=
lear what you&#39;re trying to do here.</div><div><br></div><div>Note that =
in this case option 1 isn&#39;t on the table because we&#39;ve already esta=
blished that nnhop FRR requires further extensions.<br></div><div><br></div=
><div>Cheers</div><div><br></div><div>Matt<br></div><div><br><div class=3D"=
gmail_quote"><div dir=3D"ltr">On Wed, Sep 26, 2018 at 10:17 AM Vishnu Pavan=
 Beeram &lt;<a href=3D"mailto:vishnupavan@gmail.com" target=3D"_blank">vish=
nupavan@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote"=
 style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><d=
iv dir=3D"ltr"><div style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-fa=
mily:Calibri,sans-serif"><span>Alexander
Hi!<span></span></span></div><p class=3D"MsoNormal" style=3D"margin:0in 0in=
 0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span>=
<span>=C2=A0</span></span></p><div style=3D"margin:0in 0in 0.0001pt;font-si=
ze:11pt;font-family:Calibri,sans-serif"><span>The
intent of the following statement in Section 1 is certainly not to be evasi=
ve
(slightly or otherwise).<span></span></span></div><div style=3D"margin:0in =
0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span style=3D"=
font-size:10pt;font-family:&quot;Courier New&quot;"><span>=C2=A0=C2=A0 </sp=
an>Functionalities such as bandwidth admission
control, LSP <span></span></span></div><div style=3D"margin:0in 0in 0.0001p=
t;font-size:11pt;font-family:Calibri,sans-serif"><span style=3D"font-size:1=
0pt;font-family:&quot;Courier New&quot;"><span>=C2=A0=C2=A0 </span>prioriti=
es, preemption, auto-bandwidth and
Fast Reroute <span></span></span></div><div style=3D"margin:0in 0in 0.0001p=
t;font-size:11pt;font-family:Calibri,sans-serif"><span style=3D"font-size:1=
0pt;font-family:&quot;Courier New&quot;"><span>=C2=A0=C2=A0 </span>continue=
 to work with this forwarding plane.<span></span></span></div><p class=3D"M=
soNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:&quot=
;Calibri&quot;,sans-serif"><span style=3D"font-size:10pt;font-family:&quot;=
Courier New&quot;"><span>=C2=A0</span></span></p><div style=3D"margin:0in 0=
in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span>We (the au=
thors) still don=E2=80=99t see
any problem with the above statement. But we=E2=80=99ll go ahead and make a=
 slight
adjustment (see below) to address your concern.<span></span></span></div><d=
iv style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans=
-serif"><span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;">=
<span>=C2=A0=C2=A0 </span>Key functionalities such as bandwidth
admission control, LSP <span></span></span></div><div style=3D"margin:0in 0=
in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span style=3D"f=
ont-size:10pt;font-family:&quot;Courier New&quot;"><span>=C2=A0=C2=A0 </spa=
n>priorities, preemption, auto-bandwidth and
Fast Reroute via <span></span></span></div><div style=3D"margin:0in 0in 0.0=
001pt;font-size:11pt;font-family:Calibri,sans-serif"><span style=3D"font-si=
ze:10pt;font-family:&quot;Courier New&quot;"><span>=C2=A0=C2=A0 </span>faci=
lity backup protection continue to work
with this <span></span></span></div><div style=3D"margin:0in 0in 0.0001pt;f=
ont-size:11pt;font-family:Calibri,sans-serif"><span style=3D"font-size:10pt=
;font-family:&quot;Courier New&quot;"><span>=C2=A0=C2=A0 </span>forwarding =
plane.<span></span></span></div><p class=3D"MsoNormal" style=3D"margin:0in =
0in 0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><sp=
an style=3D"font-size:10pt;font-family:&quot;Courier New&quot;"><span>=C2=
=A0</span></span></p><div style=3D"margin:0in 0in 0.0001pt;font-size:11pt;f=
ont-family:Calibri,sans-serif"><span>Regards,<span></span></span></div><div=
 style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-s=
erif"><span>-Pavan<span></span></span></div>





<br><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Tue, Sep 25, 2018 at=
 11:34 AM Alexander Okonnikov &lt;<a href=3D"mailto:alexander.okonnikov@gma=
il.com" target=3D"_blank">alexander.okonnikov@gmail.com</a>&gt; wrote:<br><=
/div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-le=
ft:1px #ccc solid;padding-left:1ex"><div style=3D"word-wrap:break-word;line=
-break:after-white-space">Hi Panav,<div><br></div><div>Ok, 1:1 is not to be=
 supported by this approach. In general, 1:1 has its own benefits =C2=A0- f=
or example, it is more attractive versus N:1 in ring topologies. After all,=
 it is FRR too, as N:1 one. My point was that description in section 1 is s=
lightly evasive regarding FRR and other RSVP-TE properties (PMTUD).</div><d=
iv><br></div><div>Thank you.</div><div><br><div><br><blockquote type=3D"cit=
e"><div>16 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 4:38, Vishnu Pava=
n Beeram &lt;<a href=3D"mailto:vishnupavan@gmail.com" target=3D"_blank">vis=
hnupavan@gmail.com</a>&gt; =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=
=B0):</div><br class=3D"m_-297057523195160134m_-385941263647088565m_-183068=
7956985248383m_1343084799946502028m_2764878390082138059Apple-interchange-ne=
wline"><div><div dir=3D"ltr"><div style=3D"margin:0in 0in 0.0001pt;font-siz=
e:11pt;font-family:Calibri,sans-serif"><span>Alexander,
Hi!<span></span></span></div><p class=3D"MsoNormal" style=3D"margin:0in 0in=
 0.0001pt;font-size:11pt;font-family:&quot;Calibri&quot;,sans-serif"><span>=
<span>=C2=A0</span></span></p><div style=3D"margin:0in 0in 0.0001pt;font-si=
ze:11pt;font-family:Calibri,sans-serif"><span>Please
see inline for responses (prefixed VPB).<span></span></span></div><p class=
=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:=
&quot;Calibri&quot;,sans-serif"><span>=C2=A0<span></span></span></p><div st=
yle=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-seri=
f"><span>Regards,<span></span></span></div><div style=3D"margin:0in 0in 0.0=
001pt;font-size:11pt;font-family:Calibri,sans-serif"><span>-Pavan<span></sp=
an></span></div>





<br><div class=3D"gmail_quote"><div dir=3D"ltr">On Thu, Sep 13, 2018 at 1:3=
7 PM Alexander Okonnikov &lt;<a href=3D"mailto:alexander.okonnikov@gmail.co=
m" target=3D"_blank">alexander.okonnikov@gmail.com</a>&gt; wrote:<br></div>=
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div style=3D"word-wrap:break-word;line-brea=
k:after-white-space">Hi Panav,<div><br></div><div><div>From section 7:</div=
><div><br></div><div><br></div><div><span class=3D"m_-297057523195160134m_-=
385941263647088565m_-1830687956985248383m_1343084799946502028m_276487839008=
2138059m_879809512118735882Apple-tab-span" style=3D"white-space:pre-wrap">	=
</span>&quot;If the label type is a delegation label, then the stacking pro=
cedure stops at that delegation hop.&quot;</div><div><span class=3D"m_-2970=
57523195160134m_-385941263647088565m_-1830687956985248383m_1343084799946502=
028m_2764878390082138059m_879809512118735882Apple-tab-span" style=3D"white-=
space:pre-wrap">	</span></div><div>It is OK for &quot;Stack to Reach Delega=
tion Hop&quot; approach, but it doesn&#39;t work for &quot;Stack to Reach E=
gress&quot;, isn&#39;t it?</div></div></div></blockquote><div><br></div><di=
v><div style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,=
sans-serif"><span>[VPB] The
logic specified in Section 7 could be used by any node constructing the lab=
el
stack (this could be the ingress or a delegation hop). The sentence immedia=
tely
following the above quoted sentence in Section 7 is important. It currently=
 reads
=E2=80=93 <span></span></span></div><div style=3D"margin:0in 0in 0.0001pt;f=
ont-size:11pt;font-family:Calibri,sans-serif"><span style=3D"font-size:10pt=
;font-family:&quot;Courier New&quot;">Approaches
in <a href=3D"https://tools.ietf.org/html/draft-ietf-mpls-rsvp-shared-label=
s-03#section-5.1" target=3D"_blank"><span style=3D"color:blue">Section 5.1<=
/span></a> SHOULD be used to determine how the
delegation labels are pushed in the label stack.<span></span></span></div><=
p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-=
family:&quot;Calibri&quot;,sans-serif"><span><span>=C2=A0</span></span></p>=
<div style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sa=
ns-serif"><span>The
intent here is to say that if you encounter a delegation label, use the
procedures outlined in Section 5.1 to determine how the delegation labels a=
re
pushed in the label stack. The following change to the text should address
this comment:<span></span></span></div>

</div><div><br><div style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-fa=
mily:Calibri,sans-serif"><span>OLD:<span></span></span></div>

<pre style=3D"margin:0in 0in 0.0001pt;font-size:10pt;font-family:&quot;Cour=
ier New&quot;"><span>If the label type is a delegation label, then the stac=
king procedure stops at that delegation hop.<span>=C2=A0 </span><br>Approac=
hes in <a href=3D"https://tools.ietf.org/html/draft-ietf-mpls-rsvp-shared-l=
abels-03#section-5.1" target=3D"_blank"><span style=3D"color:blue">Section =
5.1</span></a> SHOULD be used to determine how the delegation labels are pu=
shed in the label stack.<span></span></span></pre><p class=3D"MsoNormal" st=
yle=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:&quot;Calibri&quo=
t;,sans-serif"><span><span>=C2=A0</span></span></p><div style=3D"margin:0in=
 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif"><span>NEW:<spa=
n></span></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:11pt;=
font-family:Calibri,sans-serif"><span style=3D"font-size:10pt;font-family:&=
quot;Courier New&quot;">If the label type is a delegation
label, then the type of stacking approach chosen by the ingress for this LS=
P (Section
5.1) MUST be used to determine how the delegation labels are pushed in the =
label stack.</span><span><span></span></span></div><p class=3D"MsoNormal" s=
tyle=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:&quot;Calibri&qu=
ot;,sans-serif"><span style=3D"font-size:10pt;font-family:&quot;Courier New=
&quot;"><span></span></span></p><div style=3D"margin:0in 0in 0.0001pt;font-=
size:11pt;font-family:Calibri,sans-serif"><span><span></span></span>=C2=A0





<br></div></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8e=
x;border-left:1px #ccc solid;padding-left:1ex"><div style=3D"word-wrap:brea=
k-word;line-break:after-white-space"><div><div><br></div><div>Also, regardi=
ng FRR support. Section 1 says:</div><div><br></div><div><span class=3D"m_-=
297057523195160134m_-385941263647088565m_-1830687956985248383m_134308479994=
6502028m_2764878390082138059m_879809512118735882Apple-tab-span" style=3D"wh=
ite-space:pre-wrap">	</span>&quot;Functionalities such as bandwidth admissi=
on control, LSP priorities, preemption,=C2=A0</div><div><span class=3D"m_-2=
97057523195160134m_-385941263647088565m_-1830687956985248383m_1343084799946=
502028m_2764878390082138059m_879809512118735882Apple-tab-span" style=3D"whi=
te-space:pre-wrap">	</span>auto-bandwidth and Fast Reroute continue to work=
 with this forwarding plane.&quot;</div><div><span class=3D"m_-297057523195=
160134m_-385941263647088565m_-1830687956985248383m_1343084799946502028m_276=
4878390082138059m_879809512118735882Apple-tab-span" style=3D"white-space:pr=
e-wrap">	</span></div><div>It seems that shared labels approach supports on=
ly facility bypass link-protection. It doesn&#39;t support one-to-one link-=
 and node-protection, per my understanding. Facility bypass node-protection=
 is not supported as well (as mentioned in Section 8). Hence, FRR support i=
s very limited, and section 1 needs correction.</div></div></div></blockquo=
te><div><br></div><div><div style=3D"margin:0in 0in 0.0001pt;font-size:11pt=
;font-family:Calibri,sans-serif"><span>[VPB] I don=E2=80=99t
see anything wrong with the quoted text. Fast Reroute for MPLS-TE LSPs can =
be realized
by either the 1-to-1 protection mechanism (detours) or the facility bypass =
mechanism.
The authors don=E2=80=99t intend to add procedures for 1-to-1 link/node pro=
tection (who
needs it?). <span>=C2=A0</span>The facility bypass
link-protection procedure is discussed in this draft. The facility bypass
node-protection procedure is discussed in <a href=3D"https://tools.ietf.org=
/html/draft-chandra-mpls-rsvp-shared-labels-np-00" style=3D"color:blue;text=
-decoration:underline" target=3D"_blank">https://tools.ietf.org/html/draft-=
chandra-mpls-rsvp-shared-labels-np-00</a>
(this was presented at the last IETF). <span></span></span></div>=C2=A0





<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bord=
er-left:1px #ccc solid;padding-left:1ex"><div style=3D"word-wrap:break-word=
;line-break:after-white-space"><div><div><br></div><div>Thank you.</div><di=
v><br><blockquote type=3D"cite"><div>13 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=
=B3., =D0=B2 20:28, Alexander Okonnikov &lt;<a href=3D"mailto:alexander.oko=
nnikov@gmail.com" target=3D"_blank">alexander.okonnikov@gmail.com</a>&gt; =
=D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):</div><br class=3D"m_-29=
7057523195160134m_-385941263647088565m_-1830687956985248383m_13430847999465=
02028m_2764878390082138059m_879809512118735882Apple-interchange-newline"><d=
iv><div style=3D"word-wrap:break-word;line-break:after-white-space">Hi Pana=
v,<div><br></div><div><div>Questions regarding ETLD:</div><div><br></div><d=
iv>The draft is not clear about signaling of ETLD attribute. It says that E=
TLD is conveyed as per-hop attribute. Is my understanding correct that it i=
s conveyed as RRO Hop attribute? Probably it could be cleaned to avoid conf=
usion whether ERO or RRO Hop attribute mechanism is used.</div><div><br></d=
iv><div>Next, the draft says that:</div><div><br></div><div><span class=3D"=
m_-297057523195160134m_-385941263647088565m_-1830687956985248383m_134308479=
9946502028m_2764878390082138059m_879809512118735882Apple-tab-span" style=3D=
"white-space:pre-wrap">	</span>&quot;... If a node is reached where the ETL=
D set from the previous hop is 1, then that</div><div><span class=3D"m_-297=
057523195160134m_-385941263647088565m_-1830687956985248383m_134308479994650=
2028m_2764878390082138059m_879809512118735882Apple-tab-span" style=3D"white=
-space:pre-wrap">	</span>node MUST select itself as the delegation hop.=C2=
=A0 If a node is reached and it is=C2=A0</div><div><span class=3D"m_-297057=
523195160134m_-385941263647088565m_-1830687956985248383m_134308479994650202=
8m_2764878390082138059m_879809512118735882Apple-tab-span" style=3D"white-sp=
ace:pre-wrap">	</span>determined that this hop cannot receive more than one=
 transport label, then that node=C2=A0</div><div><span class=3D"m_-29705752=
3195160134m_-385941263647088565m_-1830687956985248383m_1343084799946502028m=
_2764878390082138059m_879809512118735882Apple-tab-span" style=3D"white-spac=
e:pre-wrap">	</span>MUST select itself as the delegation hop. ...&quot;</di=
v><div><br></div><div>What is purpose of the second sentence/rule?</div><di=
v><br></div><div>Next:</div><div><br></div><div><span class=3D"m_-297057523=
195160134m_-385941263647088565m_-1830687956985248383m_1343084799946502028m_=
2764878390082138059m_879809512118735882Apple-tab-span" style=3D"white-space=
:pre-wrap">	</span>&quot;If there is a node or a sequence of nodes along th=
e path of the LSP that do not=C2=A0</div><div><span class=3D"m_-29705752319=
5160134m_-385941263647088565m_-1830687956985248383m_1343084799946502028m_27=
64878390082138059m_879809512118735882Apple-tab-span" style=3D"white-space:p=
re-wrap">	</span>support ETLD, then the immediate hop that supports ETLD MU=
ST select itself as the=C2=A0</div><div><span class=3D"m_-29705752319516013=
4m_-385941263647088565m_-1830687956985248383m_1343084799946502028m_27648783=
90082138059m_879809512118735882Apple-tab-span" style=3D"white-space:pre-wra=
p">	</span>delegation hop.&quot;</div><div><br></div><div>If some node (con=
secutive nodes) doesn&#39;t support ETLD then it doesn&#39;t support TE lab=
els. Hence, that node (regular RSVP-TE LSR) will do SWAP and not POP. As a =
result non-decremented ETLD is OK and immediate hop that supports ETLD not =
necessary should become delegation hop?</div><div><br></div><div>Also, from=
 Section 9.7:</div><div><br></div><div>&quot;The ETLD field specifies the m=
aximum number of transport labels that this hop can potentially send to its=
 downstream hop.=C2=A0 It MUST be set to a non-zero value.&quot;</div><div>=
<br></div><div>Strictly speaking it is not correct. ETLD reflects decrement=
ing counter and not capability of some transit node. I.e. if we consider LS=
P R1-R2-R3, R1 puts value 5 in ETLD,and R2 supports imposing of 2 labels, i=
t doesn&#39;t mean that R2 should rewrite ETLD with value 2. It just should=
 decrement value 5. Correct?</div><div><br></div><div>Also, per my understa=
nding it is supposed that in fact ETLD value will not be just decremented, =
but it will be copied from previous RRO Hop attributes subobject into being=
 inserted RRO Hop attributes subobject with decrementing. May be it would b=
e better to signal ETLD value in LSP Attributes object (and each capable no=
de decrements ETLD value there), while signaling support of ETLD itself in =
RRO Hop attributes subobject?</div><div><br></div><div>Thank you.</div><div=
><br><blockquote type=3D"cite"><div>13 =D1=81=D0=B5=D0=BD=D1=82. 2018 =D0=
=B3., =D0=B2 20:22, Alexander Okonnikov &lt;<a href=3D"mailto:alexander.oko=
nnikov@gmail.com" target=3D"_blank">alexander.okonnikov@gmail.com</a>&gt; =
=D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):</div><br class=3D"m_-29=
7057523195160134m_-385941263647088565m_-1830687956985248383m_13430847999465=
02028m_2764878390082138059m_879809512118735882Apple-interchange-newline"><d=
iv><div style=3D"word-wrap:break-word;line-break:after-white-space"><div>Hi=
 Pavan,</div><div><br></div><div>I&#39;m sorry for delay with answer.</div>=
<div><br></div><div>If ingress uses regular Path MTU discovery mechanism, i=
t could produce value of MTU lower than actual one. This is because ingress=
 doesn&#39;t know MTU per each hop. Let&#39;s consider case with four route=
rs: R1 - R2 - R3 - R4. MTU for R1-R2 link is 2000, MTU for R2-R3 is 1600 an=
d MTU for R3-R4 is 2000. By virtue of regular Path MTU discovery mechanism =
R1 will derive from FLOWSPEC that path MTU is 1600. As soon as R1 doesn&#39=
;t know how many labels in the stack will be on the lowest MTU hop, it can =
only set LSP MTU to most conservative value (1600 - 4 - 4 =3D 1592, provide=
d that R4 has advertised implicit null label). In fact actual path MTU is 1=
596 (1600 - 4 on R2-R3 hop). Of course, it could be acceptable, but calcula=
ted LSP MTU as more lower than actual as longer LSP path. For correct path =
MTU discovery ingress needs to know MTU per each hop.</div><div><br></div><=
div>Thank you.</div><div><br><blockquote type=3D"cite"><div>6 =D1=81=D0=B5=
=D0=BD=D1=82. 2018 =D0=B3., =D0=B2 18:27, Vishnu Pavan Beeram &lt;<a href=
=3D"mailto:vishnupavan@gmail.com" target=3D"_blank">vishnupavan@gmail.com</=
a>&gt; =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB(=D0=B0):</div><br class=
=3D"m_-297057523195160134m_-385941263647088565m_-1830687956985248383m_13430=
84799946502028m_2764878390082138059m_879809512118735882Apple-interchange-ne=
wline"><div><div dir=3D"ltr"><div dir=3D"ltr">Alexander, Hi!<br>=C2=A0<br>I=
 apologize for the delayed response.<br>=C2=A0<br>This draft does not propo=
se any changes to the standard RSVP MTU signaling procedures (Int Serv obje=
ct specific signaling procedures). After the initial signaling sequence is =
complete, an ingress implementation (RFC3209) would typically take the path=
 MTU learnt via signaling, run it through some local logic and then arrive =
at an MTU value that can be assigned to the LSP. This local logic typically=
 involves deducting the number of bytes in the label stack used for the LSP=
 from the path MTU learnt via signaling. The ingress implementation support=
ing this draft will rely on the Resv RRO to accurately determine the max-nu=
mber of labels pushed along the path of the LSP (note that with delegation,=
 downstream hops can impose label stacks) and account for it in the local l=
ogic used to arrive at the MTU value assigned to the LSP.<br>=C2=A0<br>I ho=
pe this addresses your question..<br>=C2=A0<br>Regards,<br>-Pavan<br></div>=
</div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Tue, Aug 7, 2018 a=
t 12:22 PM Alexander Okonnikov &lt;<a href=3D"mailto:alexander.okonnikov@gm=
ail.com" target=3D"_blank">alexander.okonnikov@gmail.com</a>&gt; wrote:<br>=
</div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-l=
eft:1px #ccc solid;padding-left:1ex">
 =20
   =20
 =20
  <div text=3D"#000000" bgcolor=3D"#FFFFFF"><p>Hi Pavan,</p><p><br>
    </p><p>Regular RSVP-TE LSPs use standard RSVP path MTU discovery
      mechanism. That one cannot be used &quot;as is&quot; for approach des=
cribed
      in the draft, and the draft doesn&#39;t address path MTU
      identification. Is it to be considered?<br>
    </p><p><br>
    </p><p>Thank you.<br>
    </p>
    <br>
    <div class=3D"m_-297057523195160134m_-385941263647088565m_-183068795698=
5248383m_1343084799946502028m_2764878390082138059m_879809512118735882m_-615=
3622752759840168moz-cite-prefix">26.07.2018 06:07, Vishnu Pavan Beeram
      =D0=BF=D0=B8=D1=88=D0=B5=D1=82:<br>
    </div>
    <blockquote type=3D"cite">
     =20
      <div dir=3D"ltr">
        <div>Chairs, Hi!</div>
        <div><br>
        </div>
        <div>As mentioned (in our presentation) in last week&#39;s WG
          session, we believe that the draft is sufficiently baked and
          ready to progress to the next stage. We would like to formally
          request this draft to be considered for WG LC.<br>
        </div>
        <div><br>
        </div>
        <div>Regards,</div>
        <div>- Pavan (on behalf of the authors)<br>
        </div>
      </div>
      <br>
      <fieldset class=3D"m_-297057523195160134m_-385941263647088565m_-18306=
87956985248383m_1343084799946502028m_2764878390082138059m_87980951211873588=
2m_-6153622752759840168mimeAttachmentHeader"></fieldset>
      <br>
      <pre>_______________________________________________
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3m_1343084799946502028m_2764878390082138059m_879809512118735882m_-615362275=
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</pre>
    </blockquote>
    <br>
  </div>

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</blockquote></div>
</div></blockquote></div><br></div></div></blockquote></div><br></div></div=
></div></blockquote></div><br></div></div></blockquote></div></div>
</div></blockquote></div><br></div></div></blockquote></div></div>
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</blockquote></div></div></div>
</blockquote></div>
</blockquote></div>
</div></blockquote></div><br></div></blockquote></div>

--0000000000004bc7510577bca91b--


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From: "Kamran Raza (skraza)" <skraza@cisco.com>
To: tom petch <ietfc@btconnect.com>, "N.Leymann@telekom.de" <N.Leymann@telekom.de>, "mpls@ietf.org" <mpls@ietf.org>
CC: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "draft-ietf-mpls-ldp-yang@ietf.org" <draft-ietf-mpls-ldp-yang@ietf.org>
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Subject: Re: [mpls] WGLC for draft-ietf-mpls-ldp-yang
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From: Mach Chen <mach.chen@huawei.com>
To: "BRUNGARD, DEBORAH A" <db3546@att.com>, "draft-ietf-mpls-lsp-ping-lag-multipath@ietf.org" <draft-ietf-mpls-lsp-ping-lag-multipath@ietf.org>
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Thread-Topic: AD review of draft-ietf-mpls-lsp-ping-lag-multipath
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Subject: Re: [mpls] AD review of draft-ietf-mpls-lsp-ping-lag-multipath
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Hi Deborah,

Sorry for the delayed response!

Thanks for your detailed review and the comments, we will try to improve th=
e draft according to your suggestion.

Best regards,
Mach

From: BRUNGARD, DEBORAH A [mailto:db3546@att.com]
Sent: Saturday, August 18, 2018 2:58 AM
To: draft-ietf-mpls-lsp-ping-lag-multipath@ietf.org
Cc: mpls@ietf.org; mpls-chairs@ietf.org
Subject: AD review of draft-ietf-mpls-lsp-ping-lag-multipath

Hi Authors,

I've reviewed your draft before starting IETF Last Call:

-          my major concern is the readability - grammar, sentence clarity.=
 I've done a mark up of the document which I will send to the authors with =
my suggestions. I think reviewers in the other areas will have a difficult =
time if we don't improve it.
-          The template for requirements language now includes reference to=
 RFC8174. I've noted it in the mark up.
-          I noted some gaps on "what happens if not supported" that need t=
o be clarified.

Thanks!
Deborah


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<span style=3D"font-size:11.0pt;color:#1F497D">Hi Deborah,<o:p></o:p></span=
></font></p>
<p class=3D"MsoNormal"><font size=3D"2" color=3D"#1f497d" face=3D"Calibri">=
<span style=3D"font-size:11.0pt;color:#1F497D"><o:p>&nbsp;</o:p></span></fo=
nt></p>
<p class=3D"MsoNormal"><font size=3D"2" color=3D"#1f497d" face=3D"Calibri">=
<span style=3D"font-size:11.0pt;color:#1F497D">Sorry for the delayed respon=
se!<o:p></o:p></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" color=3D"#1f497d" face=3D"Calibri">=
<span style=3D"font-size:11.0pt;color:#1F497D"><o:p>&nbsp;</o:p></span></fo=
nt></p>
<p class=3D"MsoNormal"><font size=3D"2" color=3D"#1f497d" face=3D"Calibri">=
<span style=3D"font-size:11.0pt;color:#1F497D">Thanks for your detailed rev=
iew and the comments, we will try to improve the draft according to your su=
ggestion.<o:p></o:p></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" color=3D"#1f497d" face=3D"Calibri">=
<span style=3D"font-size:11.0pt;color:#1F497D"><o:p>&nbsp;</o:p></span></fo=
nt></p>
<p class=3D"MsoNormal"><font size=3D"2" color=3D"#1f497d" face=3D"Calibri">=
<span style=3D"font-size:11.0pt;color:#1F497D">Best regards,<o:p></o:p></sp=
an></font></p>
<p class=3D"MsoNormal"><font size=3D"2" color=3D"#1f497d" face=3D"Calibri">=
<span style=3D"font-size:11.0pt;color:#1F497D">Mach
<o:p></o:p></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" color=3D"#1f497d" face=3D"Calibri">=
<span style=3D"font-size:11.0pt;color:#1F497D"><o:p>&nbsp;</o:p></span></fo=
nt></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 #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><font size=3D"2" face=3D"Calibri"><span style=3D"=
font-size:11.0pt;font-weight:bold">From:</span></font></b> BRUNGARD, DEBORA=
H A [mailto:db3546@att.com]
<br>
<b><span style=3D"font-weight:bold">Sent:</span></b> Saturday, August 18, 2=
018 2:58 AM<br>
<b><span style=3D"font-weight:bold">To:</span></b> draft-ietf-mpls-lsp-ping=
-lag-multipath@ietf.org<br>
<b><span style=3D"font-weight:bold">Cc:</span></b> mpls@ietf.org; mpls-chai=
rs@ietf.org<br>
<b><span style=3D"font-weight:bold">Subject:</span></b> AD review of draft-=
ietf-mpls-lsp-ping-lag-multipath<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><o:p>&nbsp;</o:p></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Hi Authors,<o:p></o:p></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><o:p>&nbsp;</o:p></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">I&#8217;ve reviewed your draft before starting IETF Last Cal=
l:<o:p></o:p></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><o:p>&nbsp;</o:p></span></font></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l1 level1 lfo3">
<![if !supportLists]><font size=3D"2" face=3D"Calibri"><span style=3D"font-=
size:11.0pt"><span style=3D"mso-list:Ignore">-<font size=3D"1" face=3D"Time=
s New Roman"><span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></font></span></span></font><![endif]>my major concern is the readab=
ility &#8211; grammar, sentence clarity. I&#8217;ve done a mark up of the d=
ocument which I will send to the authors with my suggestions. I think revie=
wers in the other areas will have a difficult
 time if we don&#8217;t improve it.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l1 level1 lfo3">
<![if !supportLists]><font size=3D"2" face=3D"Calibri"><span style=3D"font-=
size:11.0pt"><span style=3D"mso-list:Ignore">-<font size=3D"1" face=3D"Time=
s New Roman"><span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></font></span></span></font><![endif]>The template for requirements =
language now includes reference to RFC8174. I&#8217;ve noted it in the mark=
 up.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-=
list:l1 level1 lfo3">
<![if !supportLists]><font size=3D"2" face=3D"Calibri"><span style=3D"font-=
size:11.0pt"><span style=3D"mso-list:Ignore">-<font size=3D"1" face=3D"Time=
s New Roman"><span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></font></span></span></font><![endif]>I noted some gaps on &#8220;wh=
at happens if not supported&#8221; that need to be clarified.<o:p></o:p></p=
>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><o:p>&nbsp;</o:p></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Thanks!<o:p></o:p></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt">Deborah<o:p></o:p></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Calibri"><span style=3D"fon=
t-size:11.0pt"><o:p>&nbsp;</o:p></span></font></p>
</div>
</div>
</body>
</html>

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From: "Bocci, Matthew (Nokia - GB)" <matthew.bocci@nokia.com>
To: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "draft-malis-mpls-sfc-encapsulation@ietf.org" <draft-malis-mpls-sfc-encapsulation@ietf.org>
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Thread-Topic: MPLS-RT review of draft-malis-mpls-sfc-encapsulation-02
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Subject: [mpls] MPLS-RT review of draft-malis-mpls-sfc-encapsulation-02
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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Wed, 10 Oct 2018 15:06:37 -0400
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To: BOCCI Matthew <matthew.bocci@nokia.com>
Cc: mpls-chairs <mpls-chairs@ietf.org>, draft-malis-mpls-sfc-encapsulation@ietf.org, mpls@ietf.org
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Subject: Re: [mpls] MPLS-RT review of draft-malis-mpls-sfc-encapsulation-02
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--0000000000006a78c50577e48ea7
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Matthew,

Thanks for your review. I'll incorporate the changes post WG adoption.

Cheers,
Andy


On Wed, Oct 10, 2018 at 6:59 AM Bocci, Matthew (Nokia - GB) <
matthew.bocci@nokia.com> wrote:

> I=E2=80=99ve been selected as an MPLS-RT reviewer for
> draft-malis-mpls-sfc-encapsulation-02.
>
>
>
> This draft documents a method for encapsulating SFC packets (including an
> NSH) in an MPLS label stack that includes a label (the SFF label) allocat=
ed
> to the chain, in conformance with the MPLS architecture.
>
>
>
> I found the draft well written and the scheme makes sense if SFC needs to
> be transported directly over MPLS.
>
>
>
> In my opinion, the draft is ready for WG adoption at this time.
>
>
>
> I have a few nits that can be resolved either before or after adoption.
>
>
>
> In section 2:
>
>
>
> =E2=80=9C...by having the receiving advertise...=E2=80=9D should read =E2=
=80=9C...by having the
> receiving node advertise...=E2=80=9D
>
> =E2=80=9C...cases where additional label stack entries...=E2=80=9D should=
 read =E2=80=9C... cases
> where there are additional label stack entries...=E2=80=9D
>
> =E2=80=9C...when ACH...=E2=80=9D should read =E2=80=9C...when an ACH...=
=E2=80=9D
>
>
>
> Regards
>
>
>
> Matthew
>
>
>
>
>

--0000000000006a78c50577e48ea7
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<div dir=3D"ltr">Matthew,<div><br></div><div>Thanks for your review. I&#39;=
ll incorporate the changes post WG adoption.</div><div><br></div><div>Cheer=
s,</div><div>Andy</div><div><br></div></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr">On Wed, Oct 10, 2018 at 6:59 AM Bocci, Matthew (Nokia - GB=
) &lt;<a href=3D"mailto:matthew.bocci@nokia.com">matthew.bocci@nokia.com</a=
>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0=
 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">





<div lang=3D"EN-GB" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"m_-3664581577505654180WordSection1">
<p class=3D"MsoNormal">I=E2=80=99ve been selected as an MPLS-RT reviewer fo=
r draft-malis-mpls-sfc-encapsulation-02.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">This draft documents a method for encapsulating SFC =
packets (including an NSH) in an MPLS label stack that includes a label (th=
e SFF label) allocated to the chain, in conformance with the MPLS architect=
ure.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">I found the draft well written and the scheme makes =
sense if SFC needs to be transported directly over MPLS.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">In my opinion, the draft is ready for WG adoption at=
 this time.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">I have a few nits that can be resolved either before=
 or after adoption.
<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">In section 2:<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">=E2=80=9C...by having the receiving advertise...=E2=
=80=9D should read =E2=80=9C...by having the receiving node advertise...=E2=
=80=9D<u></u><u></u></p>
<p class=3D"MsoNormal">=E2=80=9C...cases where additional label stack entri=
es...=E2=80=9D should read =E2=80=9C... cases where there are additional la=
bel stack entries...=E2=80=9D<u></u><u></u></p>
<p class=3D"MsoNormal">=E2=80=9C...when ACH...=E2=80=9D should read =E2=80=
=9C...when an ACH...=E2=80=9D<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Regards<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Matthew<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div>

</blockquote></div>

--0000000000006a78c50577e48ea7--


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Subject: [mpls] MPLS agenda requests for IETF 103 in Bangkok
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From: "Hejia (Jia)" <hejia@huawei.com>
To: Loa Andersson <loa@pi.nu>, Sam Aldrin <aldrin.ietf@gmail.com>, "Bocci, Matthew (Nokia - GB)" <matthew.bocci@nokia.com>, Yimin Shen <yshen@juniper.net>
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Thread-Topic: MPLS-RT review of draft-malis-mpls-sfc-encapsulation
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Date: Thu, 11 Oct 2018 09:31:01 +0000
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Subject: Re: [mpls] MPLS-RT review of draft-malis-mpls-sfc-encapsulation
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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Thu, 11 Oct 2018 09:56:19 -0400
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To: Jia HE <hejia@huawei.com>
Cc: Loa Andersson <loa@pi.nu>, Sam Aldrin <aldrin.ietf@gmail.com>,  BOCCI Matthew <matthew.bocci@nokia.com>, Yimin Shen <yshen@juniper.net>,  draft-malis-mpls-sfc-encapsulation@ietf.org,  mpls-chairs <mpls-chairs@ietf.org>, mpls@ietf.org
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Subject: Re: [mpls] MPLS-RT review of draft-malis-mpls-sfc-encapsulation
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Jia,

Thanks for your review. I personally prefer keeping section 2 as it is, so
that a reader doesn't have to looking through the document for all of the
cases, as someone not particularly interested (for example) in OAM may not
read the section on OAM considerations. Of course, once this is a WG
document, if the WG prefers a restructuring, we can do that.

Your suggestion to illustrate the label stack is a good one, and something
we can pursue once it's a WG draft.

Thanks again,
Andy


On Thu, Oct 11, 2018 at 5:31 AM Hejia (Jia) <hejia@huawei.com> wrote:

> Hi,
>
>
>
> I have reviewed draft-malis-mpls-sfc-encapsulation-02. The draft
> introduces a SFF label in the MPLS label stack, which is used to transpor=
t
> SFC packets with the NSH over an MPLS infrastructure. In summary, I think
> the draft is useful and ready to be considered for WG adoption.
>
> I have found one comment and some nits, which can be resolved either
> before or after WG adoption.
>
>
>
> Comments:
>
> As indicated by the first sentence of Section 2.1, it is to describe the
> steps of constructing label stack to "send an SFC packet with the NSF
> (typo? NSH?)". However, the first step that follows describes the special
> cases and uses OAM as an example using GAL/G-ACh where no NSH is applied =
if
> I understand correctly. It looks inconsistent somehow. Since there are
> already separate sections for OAM and ECMP considerations. Can I suggest
> leaving Section 2 to describe only the general SFF label processing and
> leave the special cases to OAM and ECMP sections respectively? And if
> possible, a figure to show the structure of label stack (e.g. the general
> case, the OAM case, the ECMP case) will be more direct and absolutely cle=
ar
> :-)
>
>
>
> Nits:
>
> Section 2, s/by having the receiving advertise .../by having the receivin=
g
> node advertise ...
>
> Section 2.1, s/When one SFF wishes to send an SFC packet with the NSF to
> another SFF.../When one SFF wishes to send an SFC packet with the NSH to
> another SFF...
>
>
>
>
>
> B.R.
>
> Jia
>
>
>
> -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
> =E5=8F=91=E4=BB=B6=E4=BA=BA: Loa Andersson [mailto:loa@pi.nu]
> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B49=E6=9C=8826=E6=97=A5 =
20:34
> =E6=94=B6=E4=BB=B6=E4=BA=BA: Sam Aldrin <aldrin.ietf@gmail.com>; Hejia (J=
ia) <hejia@huawei.com>;
> Bocci, Matthew (Nokia - GB) <matthew.bocci@nokia.com>; Yimin Shen <
> yshen@juniper.net>
> =E6=8A=84=E9=80=81: draft-malis-mpls-sfc-encapsulation@ietf.org; mpls-cha=
irs@ietf.org
> =E4=B8=BB=E9=A2=98: MPLS-RT review of draft-malis-mpls-sfc-encapsulation
>
>
>
> Sam, Jia, Matthew and Yimin,
>
>
>
>
>
> You have been selected as MPLS-RT reviewers for draft-malis-mpls-sfc-
> encapsulation.
>
>
>
> Note to authors: You have been CC'd on this email so that you can know
> that this review is going on. However, please do not review your own
> document.
>
>
>
> Reviews should comment on whether the document is coherent, is it useful
> (ie, is it likely to be actually useful in operational networks), and is
> the document technically sound?
>
>
>
> We are interested in knowing whether the document is ready to be
> considered for WG adoption (ie, it doesn't have to be perfect at this
> point, but should be a good start). Please remember that it often is easi=
er
> to progress the document when it has become a working group document. All
> comments in the MPLS-RT review needs to be addressed, but please think
> carefully about whether a comment is gating the adoption or could just as
> easily be addressed after the adoption.
>
>
>
> Reviews should be sent to the document authors, WG co-chairs and WG
> secretary, and CC'd to the MPLS WG email list. If necessary, comments may
> be sent privately to only the WG chairs.
>
>
>
> If you have technical comments you should try to be explicit about what
> needs to be resolved before adopting it as a working group document, and
> what can wait until the document is a working group document and the
> working group has the revision control.
>
>
>
> Are you able to review this draft by October 11, 2018? Please respond
> whether you are available to do the review in a timely fashion.
>
>
>
>
>
> Thanks, Loa
>
> (as MPLS WG co-chair)
>
> --
>
>
>
>
>
> Loa Andersson                        email: loa@pi.nu
>
> Senior MPLS Expert
>
> Bronze Dragon Consulting             phone: +46 739 81 21 64
>

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<div dir=3D"ltr">Jia,<div><br></div><div>Thanks for your review. I personal=
ly prefer keeping section 2 as it is, so that a reader doesn&#39;t have to =
looking through the document for all of the cases, as someone not particula=
rly interested (for example) in OAM may not read the section on OAM conside=
rations. Of=C2=A0course, once this is a WG document, if the WG prefers a re=
structuring, we can do that.</div><div><br></div><div>Your suggestion to il=
lustrate the label stack is a good one, and something we can pursue once it=
&#39;s a WG draft.</div><div><br></div><div>Thanks again,</div><div>Andy</d=
iv><div><br></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On =
Thu, Oct 11, 2018 at 5:31 AM Hejia (Jia) &lt;<a href=3D"mailto:hejia@huawei=
.com">hejia@huawei.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_q=
uote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1e=
x">





<div lang=3D"ZH-CN" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"m_4326594101303991824WordSection1">
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">Hi,<u><=
/u><u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">I have =
reviewed draft-malis-mpls-sfc-encapsulation-02. The draft introduces a SFF =
label in the MPLS label stack, which is used to transport SFC packets with =
the NSH over an MPLS infrastructure. In summary, I think
 the draft is useful and ready to be considered for WG adoption.<u></u><u><=
/u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">I have =
found one comment and some nits, which can be resolved either before or aft=
er WG adoption.
<u></u><u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">Comment=
s:<u></u><u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">As indi=
cated by the first sentence of Section 2.1, it is to describe the steps of =
constructing label stack to &quot;send an SFC packet with the NSF (typo? NS=
H?)&quot;. However, the first step that follows describes the special
 cases and uses OAM as an example using GAL/G-ACh where no NSH is applied i=
f I understand correctly. It looks inconsistent somehow. Since there are al=
ready separate sections for OAM and ECMP considerations. Can I suggest leav=
ing Section 2 to describe only the
 general SFF label processing and leave the special cases to OAM and ECMP s=
ections respectively? And if possible, a figure to show the structure of la=
bel stack (e.g. the general case, the OAM case, the ECMP case) will be more=
 direct and absolutely clear :-)<u></u><u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">Nits:<u=
></u><u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">Section=
 2, s/by having the receiving advertise .../by having the receiving
<span style=3D"background:yellow">node</span> advertise ...<u></u><u></u></=
span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">Section=
 2.1, s/When one SFF wishes to send an SFC packet with the
<span style=3D"background:yellow">NSF</span> to another SFF.../When one SFF=
 wishes to send an SFC packet with the
<span style=3D"background:yellow">NSH</span> to another SFF...<u></u><u></u=
></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">B.R.<u>=
</u><u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">Jia<u><=
/u><u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">-----</=
span><span style=3D"font-family:=E5=AE=8B=E4=BD=93">=E9=82=AE=E4=BB=B6=E5=
=8E=9F=E4=BB=B6</span><span lang=3D"EN-US">-----<br>
</span><span style=3D"font-family:=E5=AE=8B=E4=BD=93">=E5=8F=91=E4=BB=B6=E4=
=BA=BA</span><span lang=3D"EN-US">: Loa Andersson [mailto:<a href=3D"mailto=
:loa@pi.nu" target=3D"_blank">loa@pi.nu</a>]
<br>
</span><span style=3D"font-family:=E5=AE=8B=E4=BD=93">=E5=8F=91=E9=80=81=E6=
=97=B6=E9=97=B4</span><span lang=3D"EN-US">: 2018</span><span style=3D"font=
-family:=E5=AE=8B=E4=BD=93">=E5=B9=B4</span><span lang=3D"EN-US">9</span><s=
pan style=3D"font-family:=E5=AE=8B=E4=BD=93">=E6=9C=88</span><span lang=3D"=
EN-US">26</span><span style=3D"font-family:=E5=AE=8B=E4=BD=93">=E6=97=A5</s=
pan><span lang=3D"EN-US">
 20:34<br>
</span><span style=3D"font-family:=E5=AE=8B=E4=BD=93">=E6=94=B6=E4=BB=B6=E4=
=BA=BA</span><span lang=3D"EN-US">: Sam Aldrin &lt;<a href=3D"mailto:aldrin=
.ietf@gmail.com" target=3D"_blank">aldrin.ietf@gmail.com</a>&gt;; Hejia (Ji=
a) &lt;<a href=3D"mailto:hejia@huawei.com" target=3D"_blank">hejia@huawei.c=
om</a>&gt;; Bocci, Matthew (Nokia - GB) &lt;<a href=3D"mailto:matthew.bocci=
@nokia.com" target=3D"_blank">matthew.bocci@nokia.com</a>&gt;; Yimin Shen &=
lt;<a href=3D"mailto:yshen@juniper.net" target=3D"_blank">yshen@juniper.net=
</a>&gt;<br>
</span><span style=3D"font-family:=E5=AE=8B=E4=BD=93">=E6=8A=84=E9=80=81</s=
pan><span lang=3D"EN-US">: <a href=3D"mailto:draft-malis-mpls-sfc-encapsula=
tion@ietf.org" target=3D"_blank">draft-malis-mpls-sfc-encapsulation@ietf.or=
g</a>; <a href=3D"mailto:mpls-chairs@ietf.org" target=3D"_blank">mpls-chair=
s@ietf.org</a><br>
</span><span style=3D"font-family:=E5=AE=8B=E4=BD=93">=E4=B8=BB=E9=A2=98</s=
pan><span lang=3D"EN-US">: MPLS-RT review of draft-malis-mpls-sfc-encapsula=
tion</span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">Sam, Ji=
a, Matthew and Yimin,<u></u><u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">You hav=
e been selected as MPLS-RT reviewers for draft-malis-mpls-sfc- encapsulatio=
n.<u></u><u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">Note to=
 authors: You have been CC&#39;d on this email so that you can know that th=
is review is going on. However, please do not review your own document.<u><=
/u><u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">Reviews=
 should comment on whether the document is coherent, is it useful (ie, is i=
t likely to be actually useful in operational networks), and is the documen=
t technically sound?<u></u><u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">We are =
interested in knowing whether the document is ready to be considered for WG=
 adoption (ie, it doesn&#39;t have to be perfect at this point, but should =
be a good start). Please remember that it often is easier to
 progress the document when it has become a working group document. All com=
ments in the MPLS-RT review needs to be addressed, but please think careful=
ly about whether a comment is gating the adoption or could just as easily b=
e addressed after the adoption.<u></u><u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">Reviews=
 should be sent to the document authors, WG co-chairs and WG secretary, and=
 CC&#39;d to the MPLS WG email list. If necessary, comments may be sent pri=
vately to only the WG chairs.<u></u><u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">If you =
have technical comments you should try to be explicit about what needs to b=
e resolved before adopting it as a working group document, and what can wai=
t until the document is a working group document and the
 working group has the revision control.<u></u><u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">Are you=
 able to review this draft by October 11, 2018? Please respond whether you =
are available to do the review in a timely fashion.<u></u><u></u></span></p=
>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">Thanks,=
 Loa<u></u><u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">(as MPL=
S WG co-chair)<u></u><u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">-- <u><=
/u><u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">Loa And=
ersson=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 email=
:
<a href=3D"mailto:loa@pi.nu" target=3D"_blank"><span style=3D"color:windowt=
ext;text-decoration:none">loa@pi.nu</span></a><u></u><u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">Senior =
MPLS Expert<u></u><u></u></span></p>
<p class=3D"m_4326594101303991824MsoPlainText"><span lang=3D"EN-US">Bronze =
Dragon Consulting=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 phone: +46 739 81 21 64<u></u><u></u></span></p>
</div>
</div>

</blockquote></div>

--000000000000788efb0577f456cb--


From nobody Thu Oct 11 23:01:04 2018
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From: Loa Andersson <loa@pi.nu>
To: "mpls@ietf.org" <mpls@ietf.org>
Cc: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "draft-malis-mpls-sfc-encapsulation@ietf.org" <draft-malis-mpls-sfc-encapsulation@ietf.org>
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Date: Fri, 12 Oct 2018 14:00:53 +0800
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Subject: [mpls] IPR poll on draft-malis-mpls-sfc-encapsulation
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Working Group,

We are currently preparing draft draft-malis-mpls-sfc-encapsulation for
working group last call.

Part of this preparation is to do an IPR poll.

This mail is to start the IPR poll.

Are you aware of any IPR that applies to draft-malis-mpls-sfc-encapsulation?

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

There are no IPR disclosures directly against 
draft-ietf-mpls-egress-protection-framework.

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@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


From nobody Fri Oct 12 06:01:44 2018
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To: Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>
Cc: "draft-malis-mpls-sfc-encapsulation@ietf.org" <draft-malis-mpls-sfc-encapsulation@ietf.org>, "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>
References: <956f5067-862a-6bae-1cd8-cdd7ae92d650@pi.nu>
From: "Joel M. Halpern" <jmh@joelhalpern.com>
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Subject: Re: [mpls] IPR poll on draft-malis-mpls-sfc-encapsulation
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I am not aware of any relevant IPR.
Yours,
Joel

On 10/12/18 2:00 AM, Loa Andersson wrote:
> Working Group,
> 
> We are currently preparing draft draft-malis-mpls-sfc-encapsulation for
> working group last call.
> 
> Part of this preparation is to do an IPR poll.
> 
> This mail is to start the IPR poll.
> 
> Are you aware of any IPR that applies to 
> draft-malis-mpls-sfc-encapsulation?
> 
> If so, has this IPR been disclosed in compliance with IETF IPR rules
> (see RFCs 3979, 4879, 3669 and 5378 for more details).
> 
> There are no IPR disclosures directly against 
> draft-ietf-mpls-egress-protection-framework.
> 
> 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


From nobody Fri Oct 12 06:05:20 2018
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From: "Henderickx, Wim (Nokia - BE/Antwerp)" <wim.henderickx@nokia.com>
To: Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>
CC: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "draft-malis-mpls-sfc-encapsulation@ietf.org" <draft-malis-mpls-sfc-encapsulation@ietf.org>
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In-Reply-To: <162F4389-DFC1-49F8-B952-68029750B174@nokia.com>
From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Fri, 12 Oct 2018 09:07:29 -0400
Message-ID: <CAA=duU1FTjLdQ+oSBmTj3-8-8JAojbbqD7h0KntQ_AtD5MU9Zw@mail.gmail.com>
To: "Henderickx, Wim (Nokia - BE/Antwerp)" <wim.henderickx@nokia.com>
Cc: Loa Andersson <loa@pi.nu>, mpls@ietf.org, mpls-chairs <mpls-chairs@ietf.org>,  draft-malis-mpls-sfc-encapsulation@ietf.org
Content-Type: multipart/alternative; boundary="000000000000ae939c057807c504"
Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/EF6C5OcfiL7bRlQgjFqNRq5HQV0>
Subject: Re: [mpls] IPR poll on draft-malis-mpls-sfc-encapsulation
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Loa,

I am not aware of any relevant IPR.

Cheers,
Andy


On Fri, Oct 12, 2018 at 9:05 AM Henderickx, Wim (Nokia - BE/Antwerp) <
wim.henderickx@nokia.com> wrote:

> Not aware of IPR related to this draft
>
> =EF=BB=BFOn 12/10/2018, 08:01, "Loa Andersson" <loa@pi.nu> wrote:
>
>     Working Group,
>
>     We are currently preparing draft draft-malis-mpls-sfc-encapsulation f=
or
>     working group last call.
>
>     Part of this preparation is to do an IPR poll.
>
>     This mail is to start the IPR poll.
>
>     Are you aware of any IPR that applies to
> draft-malis-mpls-sfc-encapsulation?
>
>     If so, has this IPR been disclosed in compliance with IETF IPR rules
>     (see RFCs 3979, 4879, 3669 and 5378 for more details).
>
>     There are no IPR disclosures directly against
>     draft-ietf-mpls-egress-protection-framework.
>
>     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@pi.nu
>     Senior MPLS Expert
>     Bronze Dragon Consulting             phone: +46 739 81 21 64
>
>
>

--000000000000ae939c057807c504
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<div dir=3D"ltr">Loa,<div><br></div><div>I am not aware of any relevant IPR=
.<br></div><div><br></div><div>Cheers,</div><div>Andy</div><div><br></div><=
/div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Fri, Oct 12, 2018 a=
t 9:05 AM Henderickx, Wim (Nokia - BE/Antwerp) &lt;<a href=3D"mailto:wim.he=
nderickx@nokia.com">wim.henderickx@nokia.com</a>&gt; wrote:<br></div><block=
quote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc=
 solid;padding-left:1ex">Not aware of IPR related to this draft<br>
<br>
=EF=BB=BFOn 12/10/2018, 08:01, &quot;Loa Andersson&quot; &lt;<a href=3D"mai=
lto:loa@pi.nu" target=3D"_blank">loa@pi.nu</a>&gt; wrote:<br>
<br>
=C2=A0 =C2=A0 Working Group,<br>
<br>
=C2=A0 =C2=A0 We are currently preparing draft draft-malis-mpls-sfc-encapsu=
lation for<br>
=C2=A0 =C2=A0 working group last call.<br>
<br>
=C2=A0 =C2=A0 Part of this preparation is to do an IPR poll.<br>
<br>
=C2=A0 =C2=A0 This mail is to start the IPR poll.<br>
<br>
=C2=A0 =C2=A0 Are you aware of any IPR that applies to draft-malis-mpls-sfc=
-encapsulation?<br>
<br>
=C2=A0 =C2=A0 If so, has this IPR been disclosed in compliance with IETF IP=
R rules<br>
=C2=A0 =C2=A0 (see RFCs 3979, 4879, 3669 and 5378 for more details).<br>
<br>
=C2=A0 =C2=A0 There are no IPR disclosures directly against <br>
=C2=A0 =C2=A0 draft-ietf-mpls-egress-protection-framework.<br>
<br>
=C2=A0 =C2=A0 If you are listed as a document author or contributor please =
respond to<br>
=C2=A0 =C2=A0 this email regardless of whether or not you are aware of any =
relevant<br>
=C2=A0 =C2=A0 IPR. *The response needs to be sent to the MPLS WG mailing li=
st.* The<br>
=C2=A0 =C2=A0 document will not advance to the next stage until a response =
has been<br>
=C2=A0 =C2=A0 received from each author and contributor.<br>
<br>
=C2=A0 =C2=A0 If you are on the MPLS WG email list but are not listed as an=
 author or<br>
=C2=A0 =C2=A0 contributor, then please explicitly respond only if you are a=
ware of any<br>
=C2=A0 =C2=A0 IPR that has not yet been disclosed in conformance with IETF =
rules.<br>
<br>
<br>
=C2=A0 =C2=A0 /Loa<br>
=C2=A0 =C2=A0 mpls wg co-chair<br>
=C2=A0 =C2=A0 -- <br>
<br>
<br>
=C2=A0 =C2=A0 Loa Andersson=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 email: <a href=3D"mailto:loa@pi.nu" tar=
get=3D"_blank">loa@pi.nu</a><br>
=C2=A0 =C2=A0 Senior MPLS Expert<br>
=C2=A0 =C2=A0 Bronze Dragon Consulting=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0phone: +46 739 81 21 64<br>
<br>
<br>
</blockquote></div>

--000000000000ae939c057807c504--


From nobody Fri Oct 12 08:04:02 2018
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Subject: [mpls] I-D Action: draft-ietf-mpls-base-yang-07.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 WG of the IETF.

        Title           : A YANG Data Model for MPLS Base
        Authors         : Tarek Saad
                          Kamran Raza
                          Rakesh Gandhi
                          Xufeng Liu
                          Vishnu Pavan Beeram
	Filename        : draft-ietf-mpls-base-yang-07.txt
	Pages           : 18
	Date            : 2018-10-12

Abstract:
   This document contains a specification of the the MPLS base YANG
   model.  The MPLS base YANG model serves as a base framework for
   configuring and managing an MPLS switching subsystem on an MPLS-
   enabled router.  It is expected that other MPLS YANG models (e.g.
   MPLS LSP Static, LDP or RSVP-TE YANG models) will augment the MPLS
   base YANG model.


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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-mpls-base-yang-07
https://datatracker.ietf.org/doc/html/draft-ietf-mpls-base-yang-07

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-base-yang-07


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 Sat Oct 13 01:31:47 2018
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To: "mpls@ietf.org" <mpls@ietf.org>
Cc: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "draft-ietf-mpls-egress-protection-framework@ietf.org" <draft-ietf-mpls-egress-protection-framework@ietf.org>
From: Loa Andersson <loa@pi.nu>
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Date: Sat, 13 Oct 2018 16:31:36 +0800
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Subject: [mpls] Implementation poll on draft-ietf-mpls-egress-protection-framework
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Working Group,

We are preparing the publication request for
draft-ietf-mpls-egress-protection-framework.

One question we have to answer in the Shepherd Write-up is about
existing implementations.

The mail starts an implementation poll for draft-ietf-mpls-egress-
protection-framework.

Are you aware of any existing implementations and/or deployments
of draft-ietf-mpls-egress-protection-framework, please inform the
working group chairs, either through the working group mailing list
or directly to the chairs.

/Loa
mpls wg co-chair
-- 


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


From nobody Sat Oct 13 09:05:09 2018
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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 WG of the IETF.

        Title           : An MPLS-Based Forwarding Plane for Service Function Chaining
        Authors         : Adrian Farrel
                          Stewart Bryant
                          John Drake
	Filename        : draft-ietf-mpls-sfc-03.txt
	Pages           : 28
	Date            : 2018-10-13

Abstract:
   Service Function Chaining (SFC) is the process of directing packets
   through a network so that they can be acted on by an ordered set of
   abstract service functions before being delivered to the intended
   destination.  An architecture for SFC is defined in RFC7665.

   The Network Service Header (NSH) can be inserted into packets to
   steer them along a specific path to realize a Service Function Chain.

   Multiprotocol Label Switching (MPLS) is a widely deployed forwarding
   technology that uses labels placed in a packet in a label stack to
   identify the forwarding actions to be taken at each hop through a
   network.  Actions may include swapping or popping the labels as well,
   as using the labels to determine the next hop for forwarding the
   packet.  Labels may also be used to establish the context under which
   the packet is forwarded.

   This document describes how Service Function Chaining can be achieved
   in an MPLS network by means of a logical representation of the NSH in
   an MPLS label stack.  It does not deprecate or replace the NSH, but
   acknowledges that there may be a need for an interim deployment of
   SFC functionality in brownfield networks.


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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-mpls-sfc-03
https://datatracker.ietf.org/doc/html/draft-ietf-mpls-sfc-03

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-sfc-03


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

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


From nobody Sat Oct 13 09:09:22 2018
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Reply-To: <adrian@olddog.co.uk>
From: "Adrian Farrel" <adrian@olddog.co.uk>
To: <mpls@ietf.org>
Date: Sat, 13 Oct 2018 17:09:13 +0100
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Subject: [mpls] New version: draft-ietf-mpls-sfc-03.txt
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Hi,

The update here is just to fix an email address and a reference.

>From my point of view this work is done with just one open question for the
WG...

Currently we use an extended special purpose label to identify that SFC labels
follow. The question is: is this work sufficiently mainstream to use a regular
special purpose label?

Thoughts?

Thanks,
Adrian
> -----Original Message-----
> From: I-D-Announce [mailto:i-d-announce-bounces@ietf.org] On Behalf Of
> internet-drafts@ietf.org
> Sent: 13 October 2018 17:05
> To: i-d-announce@ietf.org
> Cc: mpls@ietf.org
> Subject: I-D Action: draft-ietf-mpls-sfc-03.txt
> 
> 
> A New Internet-Draft is available from the on-line Internet-Drafts
directories.
> This draft is a work item of the Multiprotocol Label Switching WG of the IETF.
> 
>         Title           : An MPLS-Based Forwarding Plane for Service Function
Chaining
>         Authors         : Adrian Farrel
>                           Stewart Bryant
>                           John Drake
> 	Filename        : draft-ietf-mpls-sfc-03.txt
> 	Pages           : 28
> 	Date            : 2018-10-13
> 
> Abstract:
>    Service Function Chaining (SFC) is the process of directing packets
>    through a network so that they can be acted on by an ordered set of
>    abstract service functions before being delivered to the intended
>    destination.  An architecture for SFC is defined in RFC7665.
> 
>    The Network Service Header (NSH) can be inserted into packets to
>    steer them along a specific path to realize a Service Function Chain.
> 
>    Multiprotocol Label Switching (MPLS) is a widely deployed forwarding
>    technology that uses labels placed in a packet in a label stack to
>    identify the forwarding actions to be taken at each hop through a
>    network.  Actions may include swapping or popping the labels as well,
>    as using the labels to determine the next hop for forwarding the
>    packet.  Labels may also be used to establish the context under which
>    the packet is forwarded.
> 
>    This document describes how Service Function Chaining can be achieved
>    in an MPLS network by means of a logical representation of the NSH in
>    an MPLS label stack.  It does not deprecate or replace the NSH, but
>    acknowledges that there may be a need for an interim deployment of
>    SFC functionality in brownfield networks.
> 
> 
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-mpls-sfc/
> 
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-mpls-sfc-03
> https://datatracker.ietf.org/doc/html/draft-ietf-mpls-sfc-03
> 
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-sfc-03
> 
> 
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
> _______________________________________________
> I-D-Announce mailing list
> I-D-Announce@ietf.org
> https://www.ietf.org/mailman/listinfo/i-d-announce
> Internet-Draft directories: http://www.ietf.org/shadow.html
> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt


From nobody Sat Oct 13 13:24:52 2018
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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Sat, 13 Oct 2018 13:24:35 -0700
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--000000000000baf3ae057821fea6
Content-Type: text/plain; charset="UTF-8"

Dear WG Chairs, et al.,
as the author of the BFD for Multipoint Networks over Point-to-Multi-Point
MPLS LSP (draft-mirsky-mpls-p2mp-bfd) I would like to ask you to consider
WG adoption call of the draft. The document addresses non-IP encapsulation
of p2mp BFD over MPLS LSP that may be useful if the overhead of IP,
particularly IPv6, encapsulation is the concern. The base specification of
BFD for Multipoint Networks is at this time in IESG LC.

Regards,
Greg

--000000000000baf3ae057821fea6
Content-Type: text/html; charset="UTF-8"
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<div dir=3D"ltr">Dear WG Chairs, et al.,<div>as the author of the BFD for M=
ultipoint Networks over Point-to-Multi-Point MPLS LSP (draft-mirsky-mpls-p2=
mp-bfd) I would like to ask you to consider WG adoption call of the draft. =
The document addresses non-IP encapsulation of p2mp BFD over MPLS LSP that =
may be useful if the overhead of IP, particularly IPv6, encapsulation is th=
e concern. The base specification of BFD for Multipoint Networks is at this=
 time in IESG LC.</div><div><br></div><div>Regards,</div><div>Greg</div></d=
iv>

--000000000000baf3ae057821fea6--


From nobody Sat Oct 13 17:48:04 2018
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Subject: [mpls] I-D Action: draft-ietf-mpls-static-yang-06.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 WG of the IETF.

        Title           : A YANG Data Model for MPLS Static LSPs
        Authors         : Tarek Saad
                          Kamran Raza
                          Rakesh Gandhi
                          Xufeng Liu
                          Vishnu Pavan Beeram
                          Himanshu Shah
                          Igor Bryskin
	Filename        : draft-ietf-mpls-static-yang-06.txt
	Pages           : 17
	Date            : 2018-10-13

Abstract:
   This document contains the specification for the MPLS Static Label
   Switched Paths (LSPs) YANG model.  The model allows for the
   provisioning of static LSP(s) on LER(s) and LSR(s) devices along a
   LSP path without the dependency on any signaling protocol.  The MPLS
   Static LSP model augments the MPLS base YANG model with specific data
   to configure and manage MPLS Static LSP(s).


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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-mpls-static-yang-06
https://datatracker.ietf.org/doc/html/draft-ietf-mpls-static-yang-06

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-static-yang-06


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 Sat Oct 13 19:14:05 2018
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From: Gyan Mishra <hayabusagsm@gmail.com>
Date: Sat, 13 Oct 2018 22:13:48 -0400
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Hi Greg

So this Draft would support BFD with IPv6 encap along with the IPV4 encap
for P2MP MVPN LSP so would this support all MVPN profiles.

Thank you

Gyan

On Sat, Oct 13, 2018, 4:25 PM Greg Mirsky <gregimirsky@gmail.com> wrote:

> Dear WG Chairs, et al.,
> as the author of the BFD for Multipoint Networks over Point-to-Multi-Point
> MPLS LSP (draft-mirsky-mpls-p2mp-bfd) I would like to ask you to consider
> WG adoption call of the draft. The document addresses non-IP encapsulation
> of p2mp BFD over MPLS LSP that may be useful if the overhead of IP,
> particularly IPv6, encapsulation is the concern. The base specification of
> BFD for Multipoint Networks is at this time in IESG LC.
>
> Regards,
> Greg
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

--000000000000aca4c9057826df6f
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<div dir=3D"auto">Hi Greg<div dir=3D"auto"><br></div><div dir=3D"auto">So t=
his Draft would support BFD with IPv6 encap along with the IPV4 encap for P=
2MP MVPN LSP so would this support all MVPN profiles.</div><div dir=3D"auto=
"><br></div><div dir=3D"auto">Thank you</div><div dir=3D"auto"><br></div><d=
iv dir=3D"auto">Gyan</div></div><br><div class=3D"gmail_quote"><div dir=3D"=
ltr">On Sat, Oct 13, 2018, 4:25 PM Greg Mirsky &lt;<a href=3D"mailto:gregim=
irsky@gmail.com">gregimirsky@gmail.com</a>&gt; wrote:<br></div><blockquote =
class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid=
;padding-left:1ex"><div dir=3D"ltr">Dear WG Chairs, et al.,<div>as the auth=
or of the BFD for Multipoint Networks over Point-to-Multi-Point MPLS LSP (d=
raft-mirsky-mpls-p2mp-bfd) I would like to ask you to consider WG adoption =
call of the draft. The document addresses non-IP encapsulation of p2mp BFD =
over MPLS LSP that may be useful if the overhead of IP, particularly IPv6, =
encapsulation is the concern. The base specification of BFD for Multipoint =
Networks is at this time in IESG LC.</div><div><br></div><div>Regards,</div=
><div>Greg</div></div>
_______________________________________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank" rel=3D"noreferrer">mpls@=
ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" rel=3D"noreferrer no=
referrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/mpls</a><=
br>
</blockquote></div>

--000000000000aca4c9057826df6f--


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To: adrian@olddog.co.uk, mpls@ietf.org
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From: Loa Andersson <loa@pi.nu>
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Subject: Re: [mpls] New version: draft-ietf-mpls-sfc-03.txt
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Adrian, Authors, working group,

Speaking as someone that has to manage the rather scarce pool of
"regular" special purpose labels.

If there is no compelling reason to use the "regular" special purpose
labels, I'd say that we stay with the extended special purpose label.

/Loa

On 2018-10-14 00:09, Adrian Farrel wrote:
> Hi,
> 
> The update here is just to fix an email address and a reference.
> 
>>From my point of view this work is done with just one open question for the
> WG...
> 
> Currently we use an extended special purpose label to identify that SFC labels
> follow. The question is: is this work sufficiently mainstream to use a regular
> special purpose label?
> 
> Thoughts?
> 
> Thanks,
> Adrian
>> -----Original Message-----
>> From: I-D-Announce [mailto:i-d-announce-bounces@ietf.org] On Behalf Of
>> internet-drafts@ietf.org
>> Sent: 13 October 2018 17:05
>> To: i-d-announce@ietf.org
>> Cc: mpls@ietf.org
>> Subject: I-D Action: draft-ietf-mpls-sfc-03.txt
>>
>>
>> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
>> This draft is a work item of the Multiprotocol Label Switching WG of the IETF.
>>
>>          Title           : An MPLS-Based Forwarding Plane for Service Function
> Chaining
>>          Authors         : Adrian Farrel
>>                            Stewart Bryant
>>                            John Drake
>> 	Filename        : draft-ietf-mpls-sfc-03.txt
>> 	Pages           : 28
>> 	Date            : 2018-10-13
>>
>> Abstract:
>>     Service Function Chaining (SFC) is the process of directing packets
>>     through a network so that they can be acted on by an ordered set of
>>     abstract service functions before being delivered to the intended
>>     destination.  An architecture for SFC is defined in RFC7665.
>>
>>     The Network Service Header (NSH) can be inserted into packets to
>>     steer them along a specific path to realize a Service Function Chain.
>>
>>     Multiprotocol Label Switching (MPLS) is a widely deployed forwarding
>>     technology that uses labels placed in a packet in a label stack to
>>     identify the forwarding actions to be taken at each hop through a
>>     network.  Actions may include swapping or popping the labels as well,
>>     as using the labels to determine the next hop for forwarding the
>>     packet.  Labels may also be used to establish the context under which
>>     the packet is forwarded.
>>
>>     This document describes how Service Function Chaining can be achieved
>>     in an MPLS network by means of a logical representation of the NSH in
>>     an MPLS label stack.  It does not deprecate or replace the NSH, but
>>     acknowledges that there may be a need for an interim deployment of
>>     SFC functionality in brownfield networks.
>>
>>
>> The IETF datatracker status page for this draft is:
>> https://datatracker.ietf.org/doc/draft-ietf-mpls-sfc/
>>
>> There are also htmlized versions available at:
>> https://tools.ietf.org/html/draft-ietf-mpls-sfc-03
>> https://datatracker.ietf.org/doc/html/draft-ietf-mpls-sfc-03
>>
>> A diff from the previous version is available at:
>> https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-sfc-03
>>
>>
>> Please note that it may take a couple of minutes from the time of submission
>> until the htmlized version and diff are available at tools.ietf.org.
>>
>> Internet-Drafts are also available by anonymous FTP at:
>> ftp://ftp.ietf.org/internet-drafts/
>>
>> _______________________________________________
>> I-D-Announce mailing list
>> I-D-Announce@ietf.org
>> https://www.ietf.org/mailman/listinfo/i-d-announce
>> Internet-Draft directories: http://www.ietf.org/shadow.html
>> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
> 
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
> 

-- 


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


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The MPLS WG has placed draft-mirsky-mpls-p2mp-bfd in state
Candidate for WG Adoption (entered by Loa Andersson)

The document is available at
https://datatracker.ietf.org/doc/draft-mirsky-mpls-p2mp-bfd/


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Subject: [mpls] The MPLS WG has placed draft-malis-mpls-sfc-encapsulation in state "Candidate for WG Adoption"
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The MPLS WG has placed draft-malis-mpls-sfc-encapsulation in state
Candidate for WG Adoption (entered by Loa Andersson)

The document is available at
https://datatracker.ietf.org/doc/draft-malis-mpls-sfc-encapsulation/


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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Mon, 15 Oct 2018 07:44:10 -0700
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To: hayabusagsm@gmail.com
Cc: mpls-chairs@ietf.org, mpls@ietf.org
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Subject: Re: [mpls] p2mp BFD over MPLS LSP
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Hi Gyan,
thank you for your very pointed question. The base specification for BFD in
multipoint networks (often referred to as "p2mp BFD") explains that in p2mp
and mp2mp MPLS LSP cases p2mp BFD MAY use IP/UDP encapsulation in Section
5.8:

   For multipoint LSPs, when IP/UDP encapsulation of BFD control packets
   is used, MultipointTail MUST expect destination UDP port 3784.
   Destination IP address of BFD control packet MUST be in 127.0.0.0/8
   range for IPv4 or in 0:0:0:0:0:FFFF:7F00:0/104 range for IPv6.  The
   use of these destination addresses is consistent with the
   explanations and usage in [RFC8029].  Packets identified as BFD
   packets MUST be consumed by MultipointTail and demultiplexed as
   described in Section 5.13.2.  Use of other types of encapsulation of
   the BFD control message over multipoint LSP is outside the scope of
   this document.

In some environments using IP/UDP encapsulation for BFD Control packet is
overburden, and this draft explains how p2mp BFD must be used with G-ACh
encapsulation. Both types, IP/UDP and G-ACh, may be used to monitor MVPN.
Additionally, note that the base p2mp BFD mode does not support tail
notification of the path failure to the head. If the protection action to
be performed not by the tail but the head, you'd need to use BFD for
Multipoint Networks with Active Tail specification. G-ACh encapsulation may
be used in any of these specs.

Regards,
Greg

On Sat, Oct 13, 2018 at 7:14 PM Gyan Mishra <hayabusagsm@gmail.com> wrote:

> Hi Greg
>
> So this Draft would support BFD with IPv6 encap along with the IPV4 encap
> for P2MP MVPN LSP so would this support all MVPN profiles.
>
> Thank you
>
> Gyan
>
> On Sat, Oct 13, 2018, 4:25 PM Greg Mirsky <gregimirsky@gmail.com> wrote:
>
>> Dear WG Chairs, et al.,
>> as the author of the BFD for Multipoint Networks over
>> Point-to-Multi-Point MPLS LSP (draft-mirsky-mpls-p2mp-bfd) I would like to
>> ask you to consider WG adoption call of the draft. The document addresses
>> non-IP encapsulation of p2mp BFD over MPLS LSP that may be useful if the
>> overhead of IP, particularly IPv6, encapsulation is the concern. The base
>> specification of BFD for Multipoint Networks is at this time in IESG LC.
>>
>> Regards,
>> Greg
>> _______________________________________________
>> mpls mailing list
>> mpls@ietf.org
>> https://www.ietf.org/mailman/listinfo/mpls
>>
>

--000000000000f42aa105784578cf
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr">Hi Gyan,<div>thank you for your very poin=
ted question. The base specification for BFD in multipoint networks (often =
referred to as &quot;p2mp BFD&quot;) explains that in p2mp and mp2mp MPLS L=
SP cases p2mp BFD MAY use IP/UDP encapsulation in Section 5.8:</div><div><d=
iv><br></div><div>=C2=A0 =C2=A0For multipoint LSPs, when IP/UDP encapsulati=
on of BFD control packets</div><div>=C2=A0 =C2=A0is used, MultipointTail MU=
ST expect destination UDP port 3784.</div><div>=C2=A0 =C2=A0Destination IP =
address of BFD control packet MUST be in <a href=3D"http://127.0.0.0/8">127=
.0.0.0/8</a></div><div>=C2=A0 =C2=A0range for IPv4 or in 0:0:0:0:0:FFFF:7F0=
0:0/104 range for IPv6.=C2=A0 The</div><div>=C2=A0 =C2=A0use of these desti=
nation addresses is consistent with the</div><div>=C2=A0 =C2=A0explanations=
 and usage in [RFC8029].=C2=A0 Packets identified as BFD</div><div>=C2=A0 =
=C2=A0packets MUST be consumed by MultipointTail and demultiplexed as</div>=
<div>=C2=A0 =C2=A0described in Section 5.13.2.=C2=A0 Use of other types of =
encapsulation of</div><div>=C2=A0 =C2=A0the BFD control message over multip=
oint LSP is outside the scope of</div><div>=C2=A0 =C2=A0this document.</div=
><div><br></div><div>In some environments using IP/UDP encapsulation for BF=
D Control packet=C2=A0is overburden, and this draft explains how p2mp BFD m=
ust be used with G-ACh encapsulation. Both types, IP/UDP and G-ACh, may be =
used to monitor MVPN. Additionally, note that the base p2mp BFD mode does n=
ot support tail notification of the path failure to the head. If the protec=
tion action to be performed not by the tail but the head, you&#39;d need to=
 use BFD for Multipoint Networks=C2=A0with Active Tail specification. G-ACh=
 encapsulation may be used in any of these specs.</div><div><br></div><div>=
Regards,</div><div>Greg</div><br><div class=3D"gmail_quote"><div dir=3D"ltr=
">On Sat, Oct 13, 2018 at 7:14 PM Gyan Mishra &lt;<a href=3D"mailto:hayabus=
agsm@gmail.com">hayabusagsm@gmail.com</a>&gt; wrote:<br></div><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px soli=
d rgb(204,204,204);padding-left:1ex"><div dir=3D"auto">Hi Greg<div dir=3D"a=
uto"><br></div><div dir=3D"auto">So this Draft would support BFD with IPv6 =
encap along with the IPV4 encap for P2MP MVPN LSP so would this support all=
 MVPN profiles.</div><div dir=3D"auto"><br></div><div dir=3D"auto">Thank yo=
u</div><div dir=3D"auto"><br></div><div dir=3D"auto">Gyan</div></div><br><d=
iv class=3D"gmail_quote"><div dir=3D"ltr">On Sat, Oct 13, 2018, 4:25 PM Gre=
g Mirsky &lt;<a href=3D"mailto:gregimirsky@gmail.com">gregimirsky@gmail.com=
</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:=
0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">=
<div dir=3D"ltr">Dear WG Chairs, et al.,<div>as the author of the BFD for M=
ultipoint Networks over Point-to-Multi-Point MPLS LSP (draft-mirsky-mpls-p2=
mp-bfd) I would like to ask you to consider WG adoption call of the draft. =
The document addresses non-IP encapsulation of p2mp BFD over MPLS LSP that =
may be useful if the overhead of IP, particularly IPv6, encapsulation is th=
e concern. The base specification of BFD for Multipoint Networks is at this=
 time in IESG LC.</div><div><br></div><div>Regards,</div><div>Greg</div></d=
iv>
_______________________________________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" rel=3D"noreferrer">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" rel=3D"noreferrer no=
referrer">https://www.ietf.org/mailman/listinfo/mpls</a><br>
</blockquote></div>
</blockquote></div></div></div></div>

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To: Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>
Cc: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "draft-malis-mpls-sfc-encapsulation@ietf.org" <draft-malis-mpls-sfc-encapsulation@ietf.org>
References: <956f5067-862a-6bae-1cd8-cdd7ae92d650@pi.nu>
From: Stewart Bryant <stewart.bryant@gmail.com>
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Date: Mon, 15 Oct 2018 17:08:19 +0100
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Subject: Re: [mpls] IPR poll on draft-malis-mpls-sfc-encapsulation
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I am not aware of any applicable IPR that needs to be declared.

- Stewart


On 12/10/2018 07:00, Loa Andersson wrote:
> Working Group,
>
> We are currently preparing draft draft-malis-mpls-sfc-encapsulation for
> working group last call.
>
> Part of this preparation is to do an IPR poll.
>
> This mail is to start the IPR poll.
>
> Are you aware of any IPR that applies to 
> draft-malis-mpls-sfc-encapsulation?
>
> If so, has this IPR been disclosed in compliance with IETF IPR rules
> (see RFCs 3979, 4879, 3669 and 5378 for more details).
>
> There are no IPR disclosures directly against 
> draft-ietf-mpls-egress-protection-framework.
>
> 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


From nobody Mon Oct 15 09:47:53 2018
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From: Loa Andersson <loa@pi.nu>
To: "mpls@ietf.org" <mpls@ietf.org>
Cc: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "draft-malis-mpls-sfc-encapsulation@ietf.org" <draft-malis-mpls-sfc-encapsulation@ietf.org>
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Subject: [mpls] Working Group Adoption poll on draft-malis-mpls-sfc-encapsulation
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Working Group,

This is to start a two week poll on adopting
draft-malis-mpls-sfc-encapsulation
as a 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 against this document.

The authors have all stated on the MPLS wg mailing list that they are
unaware of any IPRs that relate to this document.

The working group adoption poll ends October 30, 2018.

/Loa
mpls wg co-chair
-- 


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


From nobody Mon Oct 15 19:00:32 2018
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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Mon, 15 Oct 2018 21:00:15 -0500
Message-ID: <CAA=duU2K0D60AWB91B1AwFhk1dbEvt_AvRZ9FR3r2iPHTMhzpA@mail.gmail.com>
To: Loa Andersson <loa@pi.nu>
Cc: mpls@ietf.org, mpls-chairs <mpls-chairs@ietf.org>,  draft-malis-mpls-sfc-encapsulation@ietf.org
Content-Type: multipart/alternative; boundary="000000000000f256a305784eea0a"
Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/A1ywgZ7hoqBzhi2pWU9guAu4CfE>
Subject: Re: [mpls] Working Group Adoption poll on draft-malis-mpls-sfc-encapsulation
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Loa,

As an author, I support adoption.

Thanks,
Andy


On Mon, Oct 15, 2018 at 11:47 AM Loa Andersson <loa@pi.nu> wrote:

> Working Group,
>
> This is to start a two week poll on adopting
> draft-malis-mpls-sfc-encapsulation
> as a 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 against this document.
>
> The authors have all stated on the MPLS wg mailing list that they are
> unaware of any IPRs that relate to this document.
>
> The working group adoption poll ends October 30, 2018.
>
> /Loa
> mpls wg co-chair
> --
>
>
> Loa Andersson                        email: loa@pi.nu
> Senior MPLS Expert
> Bronze Dragon Consulting             phone: +46 739 81 21 64
>

--000000000000f256a305784eea0a
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<div dir=3D"ltr">Loa,<div><br></div><div>As an author, I support adoption.<=
/div><div><br></div><div>Thanks,</div><div>Andy</div><div><br></div></div><=
br><div class=3D"gmail_quote"><div dir=3D"ltr">On Mon, Oct 15, 2018 at 11:4=
7 AM Loa Andersson &lt;<a href=3D"mailto:loa@pi.nu">loa@pi.nu</a>&gt; wrote=
:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bor=
der-left:1px #ccc solid;padding-left:1ex">Working Group,<br>
<br>
This is to start a two week poll on adopting<br>
draft-malis-mpls-sfc-encapsulation<br>
as a 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 against this document.<br>
<br>
The authors have all stated on the MPLS wg mailing list that they are<br>
unaware of any IPRs that relate to this document.<br>
<br>
The working group adoption poll ends October 30, 2018.<br>
<br>
/Loa<br>
mpls wg co-chair<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@pi.nu" target=3D"_blank"=
>loa@pi.nu</a><br>
Senior MPLS Expert<br>
Bronze Dragon Consulting=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pho=
ne: +46 739 81 21 64<br>
</blockquote></div>

--000000000000f256a305784eea0a--


From nobody Mon Oct 15 20:09:47 2018
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Subject: [mpls] I-D Action: draft-ietf-mpls-rsvp-shared-labels-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 WG of the IETF.

        Title           : Signaling RSVP-TE tunnels on a shared MPLS forwarding plane
        Authors         : Harish Sitaraman
                          Vishnu Pavan Beeram
                          Tejal Parikh
                          Tarek Saad
	Filename        : draft-ietf-mpls-rsvp-shared-labels-05.txt
	Pages           : 22
	Date            : 2018-10-15

Abstract:
   As the scale of MPLS RSVP-TE networks has grown, so the number of
   Label Switched Paths (LSPs) supported by individual network elements
   has increased.  Various implementation recommendations have been
   proposed to manage the resulting increase in control plane state.

   However, those changes have had no effect on the number of labels
   that a transit Label Switching Router (LSR) has to support in the
   forwarding plane.  That number is governed by the number of LSPs
   transiting or terminated at the LSR and is directly related to the
   total LSP state in the control plane.

   This document defines a mechanism to prevent the maximum size of the
   label space limit on an LSR from being a constraint to control plane
   scaling on that node.  It introduces the notion of pre-installed 'per
   Traffic Engineering (TE) link labels' that can be shared by MPLS
   RSVP-TE LSPs that traverse these TE links.  This approach
   significantly reduces the forwarding plane state required to support
   a large number of LSPs.  This couples the feature benefits of the
   RSVP-TE control plane with the simplicity of the Segment Routing MPLS
   forwarding plane.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-rsvp-shared-labels/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-mpls-rsvp-shared-labels-05
https://datatracker.ietf.org/doc/html/draft-ietf-mpls-rsvp-shared-labels-05

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


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

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


From nobody Mon Oct 15 20:18:48 2018
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--000000000000c40b78057850021a
Content-Type: text/plain; charset="UTF-8"

WG,

This document requests the addition of a new sub-registry for Label
Sub-object Flags. We just uploaded a new revision (-05) clarifying the
allocation policy for this new sub-registry (Thanks to Loa for pointing
this out).

Regards,
-Pavan (on behalf of the authors)


---------- Forwarded message ---------
From: <internet-drafts@ietf.org>
Date: Mon, Oct 15, 2018 at 11:11 PM
Subject: [mpls] I-D Action: draft-ietf-mpls-rsvp-shared-labels-05.txt
To: <i-d-announce@ietf.org>
Cc: <mpls@ietf.org>



A New Internet-Draft is available from the on-line Internet-Drafts
directories.
This draft is a work item of the Multiprotocol Label Switching WG of the
IETF.

        Title           : Signaling RSVP-TE tunnels on a shared MPLS
forwarding plane
        Authors         : Harish Sitaraman
                          Vishnu Pavan Beeram
                          Tejal Parikh
                          Tarek Saad
        Filename        : draft-ietf-mpls-rsvp-shared-labels-05.txt
        Pages           : 22
        Date            : 2018-10-15

Abstract:
   As the scale of MPLS RSVP-TE networks has grown, so the number of
   Label Switched Paths (LSPs) supported by individual network elements
   has increased.  Various implementation recommendations have been
   proposed to manage the resulting increase in control plane state.

   However, those changes have had no effect on the number of labels
   that a transit Label Switching Router (LSR) has to support in the
   forwarding plane.  That number is governed by the number of LSPs
   transiting or terminated at the LSR and is directly related to the
   total LSP state in the control plane.

   This document defines a mechanism to prevent the maximum size of the
   label space limit on an LSR from being a constraint to control plane
   scaling on that node.  It introduces the notion of pre-installed 'per
   Traffic Engineering (TE) link labels' that can be shared by MPLS
   RSVP-TE LSPs that traverse these TE links.  This approach
   significantly reduces the forwarding plane state required to support
   a large number of LSPs.  This couples the feature benefits of the
   RSVP-TE control plane with the simplicity of the Segment Routing MPLS
   forwarding plane.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-rsvp-shared-labels/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-mpls-rsvp-shared-labels-05
https://datatracker.ietf.org/doc/html/draft-ietf-mpls-rsvp-shared-labels-05

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


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

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

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

--000000000000c40b78057850021a
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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr">WG,<br></div><div dir=3D"ltr"><br></div><=
div>This document requests the addition of a new sub-registry for Label Sub=
-object Flags. We just uploaded a new revision (-05) clarifying the allocat=
ion policy for this new sub-registry (Thanks to Loa for pointing this out).=
<br></div><div><br></div><div>Regards,</div><div>-Pavan (on behalf of the a=
uthors)<br></div><br><div dir=3D"ltr"><br><div class=3D"gmail_quote"><div d=
ir=3D"ltr">---------- Forwarded message ---------<br>From: <span dir=3D"ltr=
">&lt;<a href=3D"mailto:internet-drafts@ietf.org">internet-drafts@ietf.org<=
/a>&gt;</span><br>Date: Mon, Oct 15, 2018 at 11:11 PM<br>Subject: [mpls] I-=
D Action: draft-ietf-mpls-rsvp-shared-labels-05.txt<br>To:  &lt;<a href=3D"=
mailto:i-d-announce@ietf.org">i-d-announce@ietf.org</a>&gt;<br>Cc:  &lt;<a =
href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>&gt;<br></div><br><br><br>
A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.<br>
This draft is a work item of the Multiprotocol Label Switching WG of the IE=
TF.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Title=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:=
 Signaling RSVP-TE tunnels on a shared MPLS forwarding plane<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Authors=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: Hari=
sh Sitaraman<br>
=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 Vishnu Pavan Beeram<br>
=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 Tejal Parikh<br>
=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 Tarek Saad<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Filename=C2=A0 =C2=A0 =C2=A0 =C2=A0 : draft-iet=
f-mpls-rsvp-shared-labels-05.txt<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pages=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:=
 22<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Date=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 :=
 2018-10-15<br>
<br>
Abstract:<br>
=C2=A0 =C2=A0As the scale of MPLS RSVP-TE networks has grown, so the number=
 of<br>
=C2=A0 =C2=A0Label Switched Paths (LSPs) supported by individual network el=
ements<br>
=C2=A0 =C2=A0has increased.=C2=A0 Various implementation recommendations ha=
ve been<br>
=C2=A0 =C2=A0proposed to manage the resulting increase in control plane sta=
te.<br>
<br>
=C2=A0 =C2=A0However, those changes have had no effect on the number of lab=
els<br>
=C2=A0 =C2=A0that a transit Label Switching Router (LSR) has to support in =
the<br>
=C2=A0 =C2=A0forwarding plane.=C2=A0 That number is governed by the number =
of LSPs<br>
=C2=A0 =C2=A0transiting or terminated at the LSR and is directly related to=
 the<br>
=C2=A0 =C2=A0total LSP state in the control plane.<br>
<br>
=C2=A0 =C2=A0This document defines a mechanism to prevent the maximum size =
of the<br>
=C2=A0 =C2=A0label space limit on an LSR from being a constraint to control=
 plane<br>
=C2=A0 =C2=A0scaling on that node.=C2=A0 It introduces the notion of pre-in=
stalled &#39;per<br>
=C2=A0 =C2=A0Traffic Engineering (TE) link labels&#39; that can be shared b=
y MPLS<br>
=C2=A0 =C2=A0RSVP-TE LSPs that traverse these TE links.=C2=A0 This approach=
<br>
=C2=A0 =C2=A0significantly reduces the forwarding plane state required to s=
upport<br>
=C2=A0 =C2=A0a large number of LSPs.=C2=A0 This couples the feature benefit=
s of the<br>
=C2=A0 =C2=A0RSVP-TE control plane with the simplicity of the Segment Routi=
ng MPLS<br>
=C2=A0 =C2=A0forwarding plane.<br>
<br>
<br>
<br>
The IETF datatracker status page for this draft is:<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-mpls-rsvp-shared-lab=
els/" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/doc=
/draft-ietf-mpls-rsvp-shared-labels/</a><br>
<br>
There are also htmlized versions available at:<br>
<a href=3D"https://tools.ietf.org/html/draft-ietf-mpls-rsvp-shared-labels-0=
5" rel=3D"noreferrer" target=3D"_blank">https://tools.ietf.org/html/draft-i=
etf-mpls-rsvp-shared-labels-05</a><br>
<a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-mpls-rsvp-share=
d-labels-05" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.=
org/doc/html/draft-ietf-mpls-rsvp-shared-labels-05</a><br>
<br>
A diff from the previous version is available at:<br>
<a href=3D"https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-mpls-rsvp-shared-=
labels-05" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/rfcdif=
f?url2=3Ddraft-ietf-mpls-rsvp-shared-labels-05</a><br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submissio=
n<br>
until the htmlized version and diff are available at <a href=3D"http://tool=
s.ietf.org" rel=3D"noreferrer" target=3D"_blank">tools.ietf.org</a>.<br>
<br>
Internet-Drafts are also available by anonymous FTP at:<br>
<a href=3D"ftp://ftp.ietf.org/internet-drafts/" rel=3D"noreferrer" target=
=3D"_blank">ftp://ftp.ietf.org/internet-drafts/</a><br>
<br>
_______________________________________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/mpls</a><br>
</div></div></div>

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From: "Henderickx, Wim (Nokia - BE/Antwerp)" <wim.henderickx@nokia.com>
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CC: "mpls@ietf.org" <mpls@ietf.org>, mpls-chairs <mpls-chairs@ietf.org>, "draft-malis-mpls-sfc-encapsulation@ietf.org" <draft-malis-mpls-sfc-encapsulation@ietf.org>
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From: Jeff Tantsura <jefftant.ietf@gmail.com>
Date: Mon, 15 Oct 2018 21:58:04 -0700
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To: "Henderickx, Wim (Nokia - BE/Antwerp)" <wim.henderickx@nokia.com>
Cc: "Andrew G. Malis" <agmalis@gmail.com>, Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>,  "draft-malis-mpls-sfc-encapsulation@ietf.org" <draft-malis-mpls-sfc-encapsulation@ietf.org>,  mpls-chairs <mpls-chairs@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/DyVPeEgCriUVyn7XpaiJzOBSzs4>
Subject: Re: [mpls] Working Group Adoption poll on draft-malis-mpls-sfc-encapsulation
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Yes/support
On Mon, Oct 15, 2018 at 21:07 Henderickx, Wim (Nokia - BE/Antwerp) <
wim.henderickx@nokia.com> wrote:

> Same here, support WG adoption. The draft defines a simple way of using
> NSH with MPLS
>
>
>
> *From: *"Andrew G. Malis" <agmalis@gmail.com>
> *Date: *Tuesday, 16 October 2018 at 04:00
> *To: *Loa Andersson <loa@pi.nu>
> *Cc: *"mpls@ietf.org" <mpls@ietf.org>, mpls-chairs <mpls-chairs@ietf.org>,
> "draft-malis-mpls-sfc-encapsulation@ietf.org" <
> draft-malis-mpls-sfc-encapsulation@ietf.org>
> *Subject: *Re: Working Group Adoption poll on
> draft-malis-mpls-sfc-encapsulation
> *Resent-From: *<alias-bounces@ietf.org>
> *Resent-To: *<agmalis@gmail.com>, <stewart.bryant@gmail.com>, <
> joel.halpern@ericsson.com>, <wim.henderickx@nokia.com>
> *Resent-Date: *Tuesday, 16 October 2018 at 04:00
>
>
>
> Loa,
>
>
>
> As an author, I support adoption.
>
>
>
> Thanks,
>
> Andy
>
>
>
>
>
> On Mon, Oct 15, 2018 at 11:47 AM Loa Andersson <loa@pi.nu> wrote:
>
> Working Group,
>
> This is to start a two week poll on adopting
> draft-malis-mpls-sfc-encapsulation
> as a 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 against this document.
>
> The authors have all stated on the MPLS wg mailing list that they are
> unaware of any IPRs that relate to this document.
>
> The working group adoption poll ends October 30, 2018.
>
> /Loa
> mpls wg co-chair
> --
>
>
> Loa Andersson                        email: loa@pi.nu
> Senior MPLS Expert
> Bronze Dragon Consulting             phone: +46 739 81 21 64
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

--000000000000bf199b057851661e
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

Yes/support<br><div class=3D"gmail_quote"><div dir=3D"ltr">On Mon, Oct 15, =
2018 at 21:07 Henderickx, Wim (Nokia - BE/Antwerp) &lt;<a href=3D"mailto:wi=
m.henderickx@nokia.com">wim.henderickx@nokia.com</a>&gt; wrote:<br></div><b=
lockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px =
#ccc solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_-5306711077931582711WordSection1">
<p class=3D"MsoNormal">Same here, support WG adoption. The draft defines a =
simple way of using NSH with MPLS<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-size:12.0pt;color:black">From=
: </span></b><span style=3D"font-size:12.0pt;color:black">&quot;Andrew G. M=
alis&quot; &lt;<a href=3D"mailto:agmalis@gmail.com" target=3D"_blank">agmal=
is@gmail.com</a>&gt;<br>
<b>Date: </b>Tuesday, 16 October 2018 at 04:00<br>
<b>To: </b>Loa Andersson &lt;<a href=3D"mailto:loa@pi.nu" target=3D"_blank"=
>loa@pi.nu</a>&gt;<br>
<b>Cc: </b>&quot;<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ie=
tf.org</a>&quot; &lt;<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpl=
s@ietf.org</a>&gt;, mpls-chairs &lt;<a href=3D"mailto:mpls-chairs@ietf.org"=
 target=3D"_blank">mpls-chairs@ietf.org</a>&gt;, &quot;<a href=3D"mailto:dr=
aft-malis-mpls-sfc-encapsulation@ietf.org" target=3D"_blank">draft-malis-mp=
ls-sfc-encapsulation@ietf.org</a>&quot; &lt;<a href=3D"mailto:draft-malis-m=
pls-sfc-encapsulation@ietf.org" target=3D"_blank">draft-malis-mpls-sfc-enca=
psulation@ietf.org</a>&gt;<br>
<b>Subject: </b>Re: Working Group Adoption poll on draft-malis-mpls-sfc-enc=
apsulation<br>
<b>Resent-From: </b>&lt;<a href=3D"mailto:alias-bounces@ietf.org" target=3D=
"_blank">alias-bounces@ietf.org</a>&gt;<br>
<b>Resent-To: </b>&lt;<a href=3D"mailto:agmalis@gmail.com" target=3D"_blank=
">agmalis@gmail.com</a>&gt;, &lt;<a href=3D"mailto:stewart.bryant@gmail.com=
" target=3D"_blank">stewart.bryant@gmail.com</a>&gt;, &lt;<a href=3D"mailto=
:joel.halpern@ericsson.com" target=3D"_blank">joel.halpern@ericsson.com</a>=
&gt;, &lt;<a href=3D"mailto:wim.henderickx@nokia.com" target=3D"_blank">wim=
.henderickx@nokia.com</a>&gt;<br>
<b>Resent-Date: </b>Tuesday, 16 October 2018 at 04:00<u></u><u></u></span><=
/p>
</div></div></div><div lang=3D"EN-US" link=3D"blue" vlink=3D"purple"><div c=
lass=3D"m_-5306711077931582711WordSection1">
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Loa, <u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">As an author, I support adoption.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Thanks,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Andy<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal">On Mon, Oct 15, 2018 at 11:47 AM Loa Andersson &lt;<=
a href=3D"mailto:loa@pi.nu" target=3D"_blank">loa@pi.nu</a>&gt; wrote:<u></=
u><u></u></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<p class=3D"MsoNormal">Working Group,<br>
<br>
This is to start a two week poll on adopting<br>
draft-malis-mpls-sfc-encapsulation<br>
as a 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 against this document.<br>
<br>
The authors have all stated on the MPLS wg mailing list that they are<br>
unaware of any IPRs that relate to this document.<br>
<br>
The working group adoption poll ends October 30, 2018.<br>
<br>
/Loa<br>
mpls wg co-chair<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@pi.nu" target=3D"_blank"=
>
loa@pi.nu</a><br>
Senior MPLS Expert<br>
Bronze Dragon Consulting=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pho=
ne: +46 739 81 21 64<u></u><u></u></p>
</blockquote>
</div>
</div>
</div>

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

--000000000000bf199b057851661e--


From nobody Mon Oct 15 22:02:46 2018
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From: Zhuangshunwan <zhuangshunwan@huawei.com>
To: Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>
CC: "draft-malis-mpls-sfc-encapsulation@ietf.org" <draft-malis-mpls-sfc-encapsulation@ietf.org>, "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>
Thread-Topic: [mpls] Working Group Adoption poll on draft-malis-mpls-sfc-encapsulation
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Subject: Re: [mpls] Working Group Adoption poll on draft-malis-mpls-sfc-encapsulation
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Yes/support

-----Original Message-----
From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson
Sent: Tuesday, October 16, 2018 12:48 AM
To: mpls@ietf.org
Cc: draft-malis-mpls-sfc-encapsulation@ietf.org; mpls-chairs@ietf.org
Subject: [mpls] Working Group Adoption poll on draft-malis-mpls-sfc-encapsu=
lation

Working Group,

This is to start a two week poll on adopting draft-malis-mpls-sfc-encapsula=
tion
as a 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 against this document.

The authors have all stated on the MPLS wg mailing list that they are unawa=
re of any IPRs that relate to this document.

The working group adoption poll ends October 30, 2018.

/Loa
mpls wg co-chair
--=20


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64

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


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To: "Andrew G. Malis" <agmalis@gmail.com>, Loa Andersson <loa@pi.nu>
Cc: mpls@ietf.org, mpls-chairs <mpls-chairs@ietf.org>, draft-malis-mpls-sfc-encapsulation@ietf.org
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From: Stewart Bryant <stewart.bryant@gmail.com>
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Subject: Re: [mpls] Working Group Adoption poll on draft-malis-mpls-sfc-encapsulation
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+1 ( for obvious reasons)

Stewart

On 16/10/2018 03:00, Andrew G. Malis wrote:
> Loa,
>
> As an author, I support adoption.
>
> Thanks,
> Andy
>
>
> On Mon, Oct 15, 2018 at 11:47 AM Loa Andersson <loa@pi.nu 
> <mailto:loa@pi.nu>> wrote:
>
>     Working Group,
>
>     This is to start a two week poll on adopting
>     draft-malis-mpls-sfc-encapsulation
>     as a MPLS working group document.
>
>     Please send your comments (support/not support) to the mpls working
>     group mailing list (mpls@ietf.org <mailto:mpls@ietf.org>). Please
>     give a technical
>     motivation for your support/not support, especially if you think that
>     the document should not be adopted as a working group document.
>
>     There are no IPR disclosures against this document.
>
>     The authors have all stated on the MPLS wg mailing list that they are
>     unaware of any IPRs that relate to this document.
>
>     The working group adoption poll ends October 30, 2018.
>
>     /Loa
>     mpls wg co-chair
>     -- 
>
>
>     Loa Andersson                        email: loa@pi.nu
>     <mailto:loa@pi.nu>
>     Senior MPLS Expert
>     Bronze Dragon Consulting             phone: +46 739 81 21 64
>


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<html>
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    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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    <p>+1 ( for obvious reasons)<br>
    </p>
    Stewart<br>
    <br>
    <div class="moz-cite-prefix">On 16/10/2018 03:00, Andrew G. Malis
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAA=duU2K0D60AWB91B1AwFhk1dbEvt_AvRZ9FR3r2iPHTMhzpA@mail.gmail.com">
      <meta http-equiv="content-type" content="text/html; charset=utf-8">
      <div dir="ltr">Loa,
        <div><br>
        </div>
        <div>As an author, I support adoption.</div>
        <div><br>
        </div>
        <div>Thanks,</div>
        <div>Andy</div>
        <div><br>
        </div>
      </div>
      <br>
      <div class="gmail_quote">
        <div dir="ltr">On Mon, Oct 15, 2018 at 11:47 AM Loa Andersson
          &lt;<a href="mailto:loa@pi.nu" moz-do-not-send="true">loa@pi.nu</a>&gt;
          wrote:<br>
        </div>
        <blockquote class="gmail_quote" style="margin:0 0 0
          .8ex;border-left:1px #ccc solid;padding-left:1ex">Working
          Group,<br>
          <br>
          This is to start a two week poll on adopting<br>
          draft-malis-mpls-sfc-encapsulation<br>
          as a MPLS working group document.<br>
          <br>
          Please send your comments (support/not support) to the mpls
          working<br>
          group mailing list (<a href="mailto:mpls@ietf.org"
            target="_blank" moz-do-not-send="true">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 against this document.<br>
          <br>
          The authors have all stated on the MPLS wg mailing list that
          they are<br>
          unaware of any IPRs that relate to this document.<br>
          <br>
          The working group adoption poll ends October 30, 2018.<br>
          <br>
          /Loa<br>
          mpls wg co-chair<br>
          -- <br>
          <br>
          <br>
          Loa Andersson                        email: <a
            href="mailto:loa@pi.nu" target="_blank"
            moz-do-not-send="true">loa@pi.nu</a><br>
          Senior MPLS Expert<br>
          Bronze Dragon Consulting             phone: +46 739 81 21 64<br>
        </blockquote>
      </div>
    </blockquote>
    <br>
  </body>
</html>

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From nobody Tue Oct 16 21:15:20 2018
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Subject: [mpls] I-D Action: draft-ietf-mpls-base-yang-08.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 WG of the IETF.

        Title           : A YANG Data Model for MPLS Base
        Authors         : Tarek Saad
                          Kamran Raza
                          Rakesh Gandhi
                          Xufeng Liu
                          Vishnu Pavan Beeram
	Filename        : draft-ietf-mpls-base-yang-08.txt
	Pages           : 18
	Date            : 2018-10-16

Abstract:
   This document contains a specification of the the MPLS base YANG
   model.  The MPLS base YANG model serves as a base framework for
   configuring and managing an MPLS switching subsystem on an MPLS-
   enabled router.  It is expected that other MPLS YANG models (e.g.
   MPLS LSP Static, LDP or RSVP-TE YANG models) will augment the MPLS
   base YANG model.


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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-mpls-base-yang-08
https://datatracker.ietf.org/doc/html/draft-ietf-mpls-base-yang-08

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-base-yang-08


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 Wed Oct 17 04:24:13 2018
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Reply-To: <adrian@olddog.co.uk>
From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'Loa Andersson'" <loa@pi.nu>, <mpls@ietf.org>
References: <017501d4630f$15fa9530$41efbf90$@olddog.co.uk> <19b32d43-6404-918a-96ed-a2aabd9d0f5e@pi.nu>
In-Reply-To: <19b32d43-6404-918a-96ed-a2aabd9d0f5e@pi.nu>
Date: Wed, 17 Oct 2018 12:24:04 +0100
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Subject: Re: [mpls] New version: draft-ietf-mpls-sfc-03.txt
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Thanks Loa,

Not hearing any raised voices on this, we probably leave the text as it =
is (with an extended special purpose label).

What's next, chairs? Are we good for WG last call?

Thanks,
Adrian

> -----Original Message-----
> From: Loa Andersson [mailto:loa@pi.nu]
> Sent: 14 October 2018 05:29
> To: adrian@olddog.co.uk; mpls@ietf.org
> Subject: Re: [mpls] New version: draft-ietf-mpls-sfc-03.txt
>=20
> Adrian, Authors, working group,
>=20
> Speaking as someone that has to manage the rather scarce pool of
> "regular" special purpose labels.
>=20
> If there is no compelling reason to use the "regular" special purpose
> labels, I'd say that we stay with the extended special purpose label.
>=20
> /Loa
>=20
> On 2018-10-14 00:09, Adrian Farrel wrote:
> > Hi,
> >
> > The update here is just to fix an email address and a reference.
> >
> >>From my point of view this work is done with just one open question =
for the
> > WG...
> >
> > Currently we use an extended special purpose label to identify that =
SFC labels
> > follow. The question is: is this work sufficiently mainstream to use =
a regular
> > special purpose label?
> >
> > Thoughts?
> >
> > Thanks,
> > Adrian
> >> -----Original Message-----
> >> From: I-D-Announce [mailto:i-d-announce-bounces@ietf.org] On Behalf =
Of
> >> internet-drafts@ietf.org
> >> Sent: 13 October 2018 17:05
> >> To: i-d-announce@ietf.org
> >> Cc: mpls@ietf.org
> >> Subject: I-D Action: draft-ietf-mpls-sfc-03.txt
> >>
> >>
> >> A New Internet-Draft is available from the on-line Internet-Drafts
> > directories.
> >> This draft is a work item of the Multiprotocol Label Switching WG =
of the IETF.
> >>
> >>          Title           : An MPLS-Based Forwarding Plane for =
Service Function
> > Chaining
> >>          Authors         : Adrian Farrel
> >>                            Stewart Bryant
> >>                            John Drake
> >> 	Filename        : draft-ietf-mpls-sfc-03.txt
> >> 	Pages           : 28
> >> 	Date            : 2018-10-13
> >>
> >> Abstract:
> >>     Service Function Chaining (SFC) is the process of directing =
packets
> >>     through a network so that they can be acted on by an ordered =
set of
> >>     abstract service functions before being delivered to the =
intended
> >>     destination.  An architecture for SFC is defined in RFC7665.
> >>
> >>     The Network Service Header (NSH) can be inserted into packets =
to
> >>     steer them along a specific path to realize a Service Function =
Chain.
> >>
> >>     Multiprotocol Label Switching (MPLS) is a widely deployed =
forwarding
> >>     technology that uses labels placed in a packet in a label stack =
to
> >>     identify the forwarding actions to be taken at each hop through =
a
> >>     network.  Actions may include swapping or popping the labels as =
well,
> >>     as using the labels to determine the next hop for forwarding =
the
> >>     packet.  Labels may also be used to establish the context under =
which
> >>     the packet is forwarded.
> >>
> >>     This document describes how Service Function Chaining can be =
achieved
> >>     in an MPLS network by means of a logical representation of the =
NSH in
> >>     an MPLS label stack.  It does not deprecate or replace the NSH, =
but
> >>     acknowledges that there may be a need for an interim deployment =
of
> >>     SFC functionality in brownfield networks.
> >>
> >>
> >> The IETF datatracker status page for this draft is:
> >> https://datatracker.ietf.org/doc/draft-ietf-mpls-sfc/
> >>
> >> There are also htmlized versions available at:
> >> https://tools.ietf.org/html/draft-ietf-mpls-sfc-03
> >> https://datatracker.ietf.org/doc/html/draft-ietf-mpls-sfc-03
> >>
> >> A diff from the previous version is available at:
> >> https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-mpls-sfc-03
> >>
> >>
> >> Please note that it may take a couple of minutes from the time of =
submission
> >> until the htmlized version and diff are available at =
tools.ietf.org.
> >>
> >> Internet-Drafts are also available by anonymous FTP at:
> >> ftp://ftp.ietf.org/internet-drafts/
> >>
> >> _______________________________________________
> >> I-D-Announce mailing list
> >> I-D-Announce@ietf.org
> >> https://www.ietf.org/mailman/listinfo/i-d-announce
> >> Internet-Draft directories: http://www.ietf.org/shadow.html
> >> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
> >
> > _______________________________________________
> > mpls mailing list
> > mpls@ietf.org
> > https://www.ietf.org/mailman/listinfo/mpls
> >
>=20
> --
>=20
>=20
> Loa Andersson                        email: loa@pi.nu
> Senior MPLS Expert
> Bronze Dragon Consulting             phone: +46 739 81 21 64


From nobody Wed Oct 17 06:35:00 2018
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To: adrian@olddog.co.uk, mpls@ietf.org
References: <017501d4630f$15fa9530$41efbf90$@olddog.co.uk> <19b32d43-6404-918a-96ed-a2aabd9d0f5e@pi.nu> <069301d4660b$e99e3500$bcda9f00$@olddog.co.uk>
From: Loa Andersson <loa@pi.nu>
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Subject: Re: [mpls] New version: draft-ietf-mpls-sfc-03.txt
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Adrian, authors,

Yes I'd say you are OK to start the wglc process.

Normally that involves:
- sheperd review (updates as necessary)
- IPR poll
- wglc (updates as mecessary)

I normally start the IPR poll as soon as I'm convinced that we
will do the wglc on the current version (maybe +1)



/Loa

On 2018-10-17 19:24, Adrian Farrel wrote:
> Thanks Loa,
> 
> Not hearing any raised voices on this, we probably leave the text as it is (with an extended special purpose label).
> 
> What's next, chairs? Are we good for WG last call?
> 
> Thanks,
> Adrian
> 
>> -----Original Message-----
>> From: Loa Andersson [mailto:loa@pi.nu]
>> Sent: 14 October 2018 05:29
>> To: adrian@olddog.co.uk; mpls@ietf.org
>> Subject: Re: [mpls] New version: draft-ietf-mpls-sfc-03.txt
>>
>> Adrian, Authors, working group,
>>
>> Speaking as someone that has to manage the rather scarce pool of
>> "regular" special purpose labels.
>>
>> If there is no compelling reason to use the "regular" special purpose
>> labels, I'd say that we stay with the extended special purpose label.
>>
>> /Loa
>>
>> On 2018-10-14 00:09, Adrian Farrel wrote:
>>> Hi,
>>>
>>> The update here is just to fix an email address and a reference.
>>>
>>> >From my point of view this work is done with just one open question for the
>>> WG...
>>>
>>> Currently we use an extended special purpose label to identify that SFC labels
>>> follow. The question is: is this work sufficiently mainstream to use a regular
>>> special purpose label?
>>>
>>> Thoughts?
>>>
>>> Thanks,
>>> Adrian
>>>> -----Original Message-----
>>>> From: I-D-Announce [mailto:i-d-announce-bounces@ietf.org] On Behalf Of
>>>> internet-drafts@ietf.org
>>>> Sent: 13 October 2018 17:05
>>>> To: i-d-announce@ietf.org
>>>> Cc: mpls@ietf.org
>>>> Subject: I-D Action: draft-ietf-mpls-sfc-03.txt
>>>>
>>>>
>>>> A New Internet-Draft is available from the on-line Internet-Drafts
>>> directories.
>>>> This draft is a work item of the Multiprotocol Label Switching WG of the IETF.
>>>>
>>>>           Title           : An MPLS-Based Forwarding Plane for Service Function
>>> Chaining
>>>>           Authors         : Adrian Farrel
>>>>                             Stewart Bryant
>>>>                             John Drake
>>>> 	Filename        : draft-ietf-mpls-sfc-03.txt
>>>> 	Pages           : 28
>>>> 	Date            : 2018-10-13
>>>>
>>>> Abstract:
>>>>      Service Function Chaining (SFC) is the process of directing packets
>>>>      through a network so that they can be acted on by an ordered set of
>>>>      abstract service functions before being delivered to the intended
>>>>      destination.  An architecture for SFC is defined in RFC7665.
>>>>
>>>>      The Network Service Header (NSH) can be inserted into packets to
>>>>      steer them along a specific path to realize a Service Function Chain.
>>>>
>>>>      Multiprotocol Label Switching (MPLS) is a widely deployed forwarding
>>>>      technology that uses labels placed in a packet in a label stack to
>>>>      identify the forwarding actions to be taken at each hop through a
>>>>      network.  Actions may include swapping or popping the labels as well,
>>>>      as using the labels to determine the next hop for forwarding the
>>>>      packet.  Labels may also be used to establish the context under which
>>>>      the packet is forwarded.
>>>>
>>>>      This document describes how Service Function Chaining can be achieved
>>>>      in an MPLS network by means of a logical representation of the NSH in
>>>>      an MPLS label stack.  It does not deprecate or replace the NSH, but
>>>>      acknowledges that there may be a need for an interim deployment of
>>>>      SFC functionality in brownfield networks.
>>>>
>>>>
>>>> The IETF datatracker status page for this draft is:
>>>> https://datatracker.ietf.org/doc/draft-ietf-mpls-sfc/
>>>>
>>>> There are also htmlized versions available at:
>>>> https://tools.ietf.org/html/draft-ietf-mpls-sfc-03
>>>> https://datatracker.ietf.org/doc/html/draft-ietf-mpls-sfc-03
>>>>
>>>> A diff from the previous version is available at:
>>>> https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-sfc-03
>>>>
>>>>
>>>> Please note that it may take a couple of minutes from the time of submission
>>>> until the htmlized version and diff are available at tools.ietf.org.
>>>>
>>>> Internet-Drafts are also available by anonymous FTP at:
>>>> ftp://ftp.ietf.org/internet-drafts/
>>>>
>>>> _______________________________________________
>>>> I-D-Announce mailing list
>>>> I-D-Announce@ietf.org
>>>> https://www.ietf.org/mailman/listinfo/i-d-announce
>>>> Internet-Draft directories: http://www.ietf.org/shadow.html
>>>> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
>>>
>>> _______________________________________________
>>> mpls mailing list
>>> mpls@ietf.org
>>> https://www.ietf.org/mailman/listinfo/mpls
>>>
>>
>> --
>>
>>
>> Loa Andersson                        email: loa@pi.nu
>> Senior MPLS Expert
>> Bronze Dragon Consulting             phone: +46 739 81 21 64
> 

-- 


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


From nobody Wed Oct 17 07:44:21 2018
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To: "mpls@ietf.org" <mpls@ietf.org>
Cc: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, draft-ietf-mpls-sfc@ietf.org, Deborah A Brungard <db3546@att.com>
From: Loa Andersson <loa@pi.nu>
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Date: Wed, 17 Oct 2018 22:44:11 +0800
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Subject: [mpls] IPR poll on draft-ietf-mpls-sfc
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Working Group,

We are currently preparing draft draft-ietf-mpls-sfc for working
group last call.

Part of this preparation is to do an IPR poll.

This mail is to start the IPR poll.

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

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

There are no IPR disclosures directly against 
draft-ietf-mpls-egress-protection-framework.

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@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


From nobody Wed Oct 17 07:48:03 2018
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From: Loa Andersson <loa@pi.nu>
To: "mpls@ietf.org" <mpls@ietf.org>
Cc: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, draft-ietf-mpls-sfc@ietf.org
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Date: Wed, 17 Oct 2018 22:47:53 +0800
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/x5lrpBDMiUHT77Q6Gyin9oBpkeo>
Subject: Re: [mpls] IPR poll on draft-ietf-mpls-sfc
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Working group,

there was a copy and paste mistake in the first mail that did go ut,
this is the correct text.

/Loa
On 2018-10-17 22:44, Loa Andersson wrote:
> Working Group,
> 
> We are currently preparing draft draft-ietf-mpls-sfc for working
> group last call.
> 
> Part of this preparation is to do an IPR poll.
> 
> This mail is to start the IPR poll.
> 
> Are you aware of any IPR that applies to draft-ietf-mpls-sfc?
> 
> If so, has this IPR been disclosed in compliance with IETF IPR rules
> (see RFCs 3979, 4879, 3669 and 5378 for more details).
> 
> There are no IPR disclosures directly against draft-ietf-mpls-sfc.
> 
> 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@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


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From: John E Drake <jdrake@juniper.net>
To: "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: IPR poll on draft-ietf-mpls-sfc
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/_Od6lUoUcFHCO97UvZ-5VVNgA04>
Subject: Re: [mpls] IPR poll on draft-ietf-mpls-sfc
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From: Gyan Mishra <hayabusagsm@gmail.com>
Date: Wed, 17 Oct 2018 10:58:22 -0400
Message-ID: <CABNhwV0zr5WeN+3jpxhw-8mR_gDOGdyCNf5sbesMMvPvmaZt+w@mail.gmail.com>
To: Greg Mirsky <gregimirsky@gmail.com>
Cc: mpls-chairs@ietf.org, mpls@ietf.org
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Subject: Re: [mpls] p2mp BFD over MPLS LSP
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Thanks Greg for the thorough explanation.

P2MP BFD over mpls lsp so that could be mldp or TE p2mp lsp correct and for
either if protection is done at the head of the lsp which would be the FEC
root you would not need the P2MP bfd with active tail spec.

Thank you

Gyan

Gyan


On Mon, Oct 15, 2018, 10:44 AM Greg Mirsky <gregimirsky@gmail.com> wrote:

> Hi Gyan,
> thank you for your very pointed question. The base specification for BFD
> in multipoint networks (often referred to as "p2mp BFD") explains that in
> p2mp and mp2mp MPLS LSP cases p2mp BFD MAY use IP/UDP encapsulation in
> Section 5.8:
>
>    For multipoint LSPs, when IP/UDP encapsulation of BFD control packets
>    is used, MultipointTail MUST expect destination UDP port 3784.
>    Destination IP address of BFD control packet MUST be in 127.0.0.0/8
>    range for IPv4 or in 0:0:0:0:0:FFFF:7F00:0/104 range for IPv6.  The
>    use of these destination addresses is consistent with the
>    explanations and usage in [RFC8029].  Packets identified as BFD
>    packets MUST be consumed by MultipointTail and demultiplexed as
>    described in Section 5.13.2.  Use of other types of encapsulation of
>    the BFD control message over multipoint LSP is outside the scope of
>    this document.
>
> In some environments using IP/UDP encapsulation for BFD Control packet is
> overburden, and this draft explains how p2mp BFD must be used with G-ACh
> encapsulation. Both types, IP/UDP and G-ACh, may be used to monitor MVPN.
> Additionally, note that the base p2mp BFD mode does not support tail
> notification of the path failure to the head. If the protection action to
> be performed not by the tail but the head, you'd need to use BFD for
> Multipoint Networks with Active Tail specification. G-ACh encapsulation may
> be used in any of these specs.
>
> Regards,
> Greg
>
> On Sat, Oct 13, 2018 at 7:14 PM Gyan Mishra <hayabusagsm@gmail.com> wrote:
>
>> Hi Greg
>>
>> So this Draft would support BFD with IPv6 encap along with the IPV4 encap
>> for P2MP MVPN LSP so would this support all MVPN profiles.
>>
>> Thank you
>>
>> Gyan
>>
>> On Sat, Oct 13, 2018, 4:25 PM Greg Mirsky <gregimirsky@gmail.com> wrote:
>>
>>> Dear WG Chairs, et al.,
>>> as the author of the BFD for Multipoint Networks over
>>> Point-to-Multi-Point MPLS LSP (draft-mirsky-mpls-p2mp-bfd) I would like to
>>> ask you to consider WG adoption call of the draft. The document addresses
>>> non-IP encapsulation of p2mp BFD over MPLS LSP that may be useful if the
>>> overhead of IP, particularly IPv6, encapsulation is the concern. The base
>>> specification of BFD for Multipoint Networks is at this time in IESG LC.
>>>
>>> Regards,
>>> Greg
>>> _______________________________________________
>>> mpls mailing list
>>> mpls@ietf.org
>>> https://www.ietf.org/mailman/listinfo/mpls
>>>
>>

--000000000000882c8f05786de764
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Content-Transfer-Encoding: quoted-printable

<div dir=3D"auto"><div>Thanks Greg for the thorough explanation.=C2=A0</div=
><div dir=3D"auto"><br></div><div dir=3D"auto">P2MP BFD over mpls lsp so th=
at could be mldp or TE p2mp lsp correct and for either if protection is don=
e at the head of the lsp which would be the FEC root you would not need the=
 P2MP bfd with active tail spec.</div><div dir=3D"auto"><br></div><div dir=
=3D"auto">Thank you=C2=A0</div><div dir=3D"auto"><br></div><div dir=3D"auto=
">Gyan</div><div dir=3D"auto"><div dir=3D"auto"><br></div><div dir=3D"auto"=
>Gyan</div><br><br><div class=3D"gmail_quote" dir=3D"auto"><div dir=3D"ltr"=
>On Mon, Oct 15, 2018, 10:44 AM Greg Mirsky &lt;<a href=3D"mailto:gregimirs=
ky@gmail.com" target=3D"_blank" rel=3D"noreferrer">gregimirsky@gmail.com</a=
>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0=
 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div =
dir=3D"ltr">Hi Gyan,<div>thank you for your very pointed question. The base=
 specification for BFD in multipoint networks (often referred to as &quot;p=
2mp BFD&quot;) explains that in p2mp and mp2mp MPLS LSP cases p2mp BFD MAY =
use IP/UDP encapsulation in Section 5.8:</div><div><div><br></div><div>=C2=
=A0 =C2=A0For multipoint LSPs, when IP/UDP encapsulation of BFD control pac=
kets</div><div>=C2=A0 =C2=A0is used, MultipointTail MUST expect destination=
 UDP port 3784.</div><div>=C2=A0 =C2=A0Destination IP address of BFD contro=
l packet MUST be in <a href=3D"http://127.0.0.0/8" rel=3D"noreferrer norefe=
rrer" target=3D"_blank">127.0.0.0/8</a></div><div>=C2=A0 =C2=A0range for IP=
v4 or in 0:0:0:0:0:FFFF:7F00:0/104 range for IPv6.=C2=A0 The</div><div>=C2=
=A0 =C2=A0use of these destination addresses is consistent with the</div><d=
iv>=C2=A0 =C2=A0explanations and usage in [RFC8029].=C2=A0 Packets identifi=
ed as BFD</div><div>=C2=A0 =C2=A0packets MUST be consumed by MultipointTail=
 and demultiplexed as</div><div>=C2=A0 =C2=A0described in Section 5.13.2.=
=C2=A0 Use of other types of encapsulation of</div><div>=C2=A0 =C2=A0the BF=
D control message over multipoint LSP is outside the scope of</div><div>=C2=
=A0 =C2=A0this document.</div><div><br></div><div>In some environments usin=
g IP/UDP encapsulation for BFD Control packet=C2=A0is overburden, and this =
draft explains how p2mp BFD must be used with G-ACh encapsulation. Both typ=
es, IP/UDP and G-ACh, may be used to monitor MVPN. Additionally, note that =
the base p2mp BFD mode does not support tail notification of the path failu=
re to the head. If the protection action to be performed not by the tail bu=
t the head, you&#39;d need to use BFD for Multipoint Networks=C2=A0with Act=
ive Tail specification. G-ACh encapsulation may be used in any of these spe=
cs.</div><div><br></div><div>Regards,</div><div>Greg</div><br><div class=3D=
"gmail_quote"><div dir=3D"ltr">On Sat, Oct 13, 2018 at 7:14 PM Gyan Mishra =
&lt;<a href=3D"mailto:hayabusagsm@gmail.com" rel=3D"noreferrer noreferrer" =
target=3D"_blank">hayabusagsm@gmail.com</a>&gt; wrote:<br></div><blockquote=
 class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px so=
lid rgb(204,204,204);padding-left:1ex"><div dir=3D"auto">Hi Greg<div dir=3D=
"auto"><br></div><div dir=3D"auto">So this Draft would support BFD with IPv=
6 encap along with the IPV4 encap for P2MP MVPN LSP so would this support a=
ll MVPN profiles.</div><div dir=3D"auto"><br></div><div dir=3D"auto">Thank =
you</div><div dir=3D"auto"><br></div><div dir=3D"auto">Gyan</div></div><br>=
<div class=3D"gmail_quote"><div dir=3D"ltr">On Sat, Oct 13, 2018, 4:25 PM G=
reg Mirsky &lt;<a href=3D"mailto:gregimirsky@gmail.com" rel=3D"noreferrer n=
oreferrer" target=3D"_blank">gregimirsky@gmail.com</a>&gt; wrote:<br></div>=
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr">Dear WG =
Chairs, et al.,<div>as the author of the BFD for Multipoint Networks over P=
oint-to-Multi-Point MPLS LSP (draft-mirsky-mpls-p2mp-bfd) I would like to a=
sk you to consider WG adoption call of the draft. The document addresses no=
n-IP encapsulation of p2mp BFD over MPLS LSP that may be useful if the over=
head of IP, particularly IPv6, encapsulation is the concern. The base speci=
fication of BFD for Multipoint Networks is at this time in IESG LC.</div><d=
iv><br></div><div>Regards,</div><div>Greg</div></div>
_______________________________________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" rel=3D"noreferrer noreferrer noreferrer" t=
arget=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" rel=3D"noreferrer no=
referrer noreferrer noreferrer" target=3D"_blank">https://www.ietf.org/mail=
man/listinfo/mpls</a><br>
</blockquote></div>
</blockquote></div></div></div></div>
</blockquote></div></div></div>

--000000000000882c8f05786de764--


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Subject: Re: [mpls] IPR poll on draft-ietf-mpls-sfc
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Hi Loa,

I'm unaware of any IPR that applies to this document.

Thanks,
Adrian

> We are currently preparing draft draft-ietf-mpls-sfc for working
> group last call.
> 
> Part of this preparation is to do an IPR poll.
> 
> This mail is to start the IPR poll.
> 
> Are you aware of any IPR that applies to draft-ietf-mpls-sfc?
> 
> If so, has this IPR been disclosed in compliance with IETF IPR rules
> (see RFCs 3979, 4879, 3669 and 5378 for more details).
> 
> There are no IPR disclosures directly against
> draft-ietf-mpls-egress-protection-framework.
> 
> 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.


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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Wed, 17 Oct 2018 08:56:09 -0700
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To: Gyan Mishra <hayabusagsm@gmail.com>
Cc: mpls-chairs@ietf.org, mpls@ietf.org
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Subject: Re: [mpls] p2mp BFD over MPLS LSP
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Hi Gyan,
if the application requires protection switchover to be performed by the
head of the p2mp LSP, then you may take advantage of p2mp BFD with active
tails. I think that it is a more suitable mode of p2mp BFD for such
scenario. For the case of 1+1 protection p2mp BFD without active tails
seems an appropriate choice.

Regards,
Greg

On Wed, Oct 17, 2018 at 7:58 AM Gyan Mishra <hayabusagsm@gmail.com> wrote:

> Thanks Greg for the thorough explanation.
>
> P2MP BFD over mpls lsp so that could be mldp or TE p2mp lsp correct and
> for either if protection is done at the head of the lsp which would be the
> FEC root you would not need the P2MP bfd with active tail spec.
>
> Thank you
>
> Gyan
>
> Gyan
>
>
> On Mon, Oct 15, 2018, 10:44 AM Greg Mirsky <gregimirsky@gmail.com> wrote:
>
>> Hi Gyan,
>> thank you for your very pointed question. The base specification for BFD
>> in multipoint networks (often referred to as "p2mp BFD") explains that in
>> p2mp and mp2mp MPLS LSP cases p2mp BFD MAY use IP/UDP encapsulation in
>> Section 5.8:
>>
>>    For multipoint LSPs, when IP/UDP encapsulation of BFD control packets
>>    is used, MultipointTail MUST expect destination UDP port 3784.
>>    Destination IP address of BFD control packet MUST be in 127.0.0.0/8
>>    range for IPv4 or in 0:0:0:0:0:FFFF:7F00:0/104 range for IPv6.  The
>>    use of these destination addresses is consistent with the
>>    explanations and usage in [RFC8029].  Packets identified as BFD
>>    packets MUST be consumed by MultipointTail and demultiplexed as
>>    described in Section 5.13.2.  Use of other types of encapsulation of
>>    the BFD control message over multipoint LSP is outside the scope of
>>    this document.
>>
>> In some environments using IP/UDP encapsulation for BFD Control packet is
>> overburden, and this draft explains how p2mp BFD must be used with G-ACh
>> encapsulation. Both types, IP/UDP and G-ACh, may be used to monitor MVPN.
>> Additionally, note that the base p2mp BFD mode does not support tail
>> notification of the path failure to the head. If the protection action to
>> be performed not by the tail but the head, you'd need to use BFD for
>> Multipoint Networks with Active Tail specification. G-ACh encapsulation may
>> be used in any of these specs.
>>
>> Regards,
>> Greg
>>
>> On Sat, Oct 13, 2018 at 7:14 PM Gyan Mishra <hayabusagsm@gmail.com>
>> wrote:
>>
>>> Hi Greg
>>>
>>> So this Draft would support BFD with IPv6 encap along with the IPV4
>>> encap for P2MP MVPN LSP so would this support all MVPN profiles.
>>>
>>> Thank you
>>>
>>> Gyan
>>>
>>> On Sat, Oct 13, 2018, 4:25 PM Greg Mirsky <gregimirsky@gmail.com> wrote:
>>>
>>>> Dear WG Chairs, et al.,
>>>> as the author of the BFD for Multipoint Networks over
>>>> Point-to-Multi-Point MPLS LSP (draft-mirsky-mpls-p2mp-bfd) I would like to
>>>> ask you to consider WG adoption call of the draft. The document addresses
>>>> non-IP encapsulation of p2mp BFD over MPLS LSP that may be useful if the
>>>> overhead of IP, particularly IPv6, encapsulation is the concern. The base
>>>> specification of BFD for Multipoint Networks is at this time in IESG LC.
>>>>
>>>> Regards,
>>>> Greg
>>>> _______________________________________________
>>>> mpls mailing list
>>>> mpls@ietf.org
>>>> https://www.ietf.org/mailman/listinfo/mpls
>>>>
>>>

--000000000000093c6d05786eb659
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Gyan,<div>if the application requires protection switch=
over to be performed by the head of the p2mp LSP, then you may take advanta=
ge of p2mp BFD with active tails. I think that it is a more suitable mode o=
f p2mp BFD for such scenario. For the case of 1+1 protection p2mp BFD witho=
ut active tails seems an appropriate choice.</div><div><br></div><div>Regar=
ds,</div><div>Greg</div></div><br><div class=3D"gmail_quote"><div dir=3D"lt=
r">On Wed, Oct 17, 2018 at 7:58 AM Gyan Mishra &lt;<a href=3D"mailto:hayabu=
sagsm@gmail.com">hayabusagsm@gmail.com</a>&gt; wrote:<br></div><blockquote =
class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid=
;padding-left:1ex"><div dir=3D"auto"><div>Thanks Greg for the thorough expl=
anation.=C2=A0</div><div dir=3D"auto"><br></div><div dir=3D"auto">P2MP BFD =
over mpls lsp so that could be mldp or TE p2mp lsp correct and for either i=
f protection is done at the head of the lsp which would be the FEC root you=
 would not need the P2MP bfd with active tail spec.</div><div dir=3D"auto">=
<br></div><div dir=3D"auto">Thank you=C2=A0</div><div dir=3D"auto"><br></di=
v><div dir=3D"auto">Gyan</div><div dir=3D"auto"><div dir=3D"auto"><br></div=
><div dir=3D"auto">Gyan</div><br><br><div class=3D"gmail_quote" dir=3D"auto=
"><div dir=3D"ltr">On Mon, Oct 15, 2018, 10:44 AM Greg Mirsky &lt;<a href=
=3D"mailto:gregimirsky@gmail.com" rel=3D"noreferrer" target=3D"_blank">greg=
imirsky@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote"=
 style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><d=
iv dir=3D"ltr"><div dir=3D"ltr">Hi Gyan,<div>thank you for your very pointe=
d question. The base specification for BFD in multipoint networks (often re=
ferred to as &quot;p2mp BFD&quot;) explains that in p2mp and mp2mp MPLS LSP=
 cases p2mp BFD MAY use IP/UDP encapsulation in Section 5.8:</div><div><div=
><br></div><div>=C2=A0 =C2=A0For multipoint LSPs, when IP/UDP encapsulation=
 of BFD control packets</div><div>=C2=A0 =C2=A0is used, MultipointTail MUST=
 expect destination UDP port 3784.</div><div>=C2=A0 =C2=A0Destination IP ad=
dress of BFD control packet MUST be in <a href=3D"http://127.0.0.0/8" rel=
=3D"noreferrer noreferrer" target=3D"_blank">127.0.0.0/8</a></div><div>=C2=
=A0 =C2=A0range for IPv4 or in 0:0:0:0:0:FFFF:7F00:0/104 range for IPv6.=C2=
=A0 The</div><div>=C2=A0 =C2=A0use of these destination addresses is consis=
tent with the</div><div>=C2=A0 =C2=A0explanations and usage in [RFC8029].=
=C2=A0 Packets identified as BFD</div><div>=C2=A0 =C2=A0packets MUST be con=
sumed by MultipointTail and demultiplexed as</div><div>=C2=A0 =C2=A0describ=
ed in Section 5.13.2.=C2=A0 Use of other types of encapsulation of</div><di=
v>=C2=A0 =C2=A0the BFD control message over multipoint LSP is outside the s=
cope of</div><div>=C2=A0 =C2=A0this document.</div><div><br></div><div>In s=
ome environments using IP/UDP encapsulation for BFD Control packet=C2=A0is =
overburden, and this draft explains how p2mp BFD must be used with G-ACh en=
capsulation. Both types, IP/UDP and G-ACh, may be used to monitor MVPN. Add=
itionally, note that the base p2mp BFD mode does not support tail notificat=
ion of the path failure to the head. If the protection action to be perform=
ed not by the tail but the head, you&#39;d need to use BFD for Multipoint N=
etworks=C2=A0with Active Tail specification. G-ACh encapsulation may be use=
d in any of these specs.</div><div><br></div><div>Regards,</div><div>Greg</=
div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Sat, Oct 13, 2018 at=
 7:14 PM Gyan Mishra &lt;<a href=3D"mailto:hayabusagsm@gmail.com" rel=3D"no=
referrer noreferrer" target=3D"_blank">hayabusagsm@gmail.com</a>&gt; wrote:=
<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8=
ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"aut=
o">Hi Greg<div dir=3D"auto"><br></div><div dir=3D"auto">So this Draft would=
 support BFD with IPv6 encap along with the IPV4 encap for P2MP MVPN LSP so=
 would this support all MVPN profiles.</div><div dir=3D"auto"><br></div><di=
v dir=3D"auto">Thank you</div><div dir=3D"auto"><br></div><div dir=3D"auto"=
>Gyan</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Sat, Oc=
t 13, 2018, 4:25 PM Greg Mirsky &lt;<a href=3D"mailto:gregimirsky@gmail.com=
" rel=3D"noreferrer noreferrer" target=3D"_blank">gregimirsky@gmail.com</a>=
&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px =
0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div=
 dir=3D"ltr">Dear WG Chairs, et al.,<div>as the author of the BFD for Multi=
point Networks over Point-to-Multi-Point MPLS LSP (draft-mirsky-mpls-p2mp-b=
fd) I would like to ask you to consider WG adoption call of the draft. The =
document addresses non-IP encapsulation of p2mp BFD over MPLS LSP that may =
be useful if the overhead of IP, particularly IPv6, encapsulation is the co=
ncern. The base specification of BFD for Multipoint Networks is at this tim=
e in IESG LC.</div><div><br></div><div>Regards,</div><div>Greg</div></div>
_______________________________________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" rel=3D"noreferrer noreferrer noreferrer" t=
arget=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" rel=3D"noreferrer no=
referrer noreferrer noreferrer" target=3D"_blank">https://www.ietf.org/mail=
man/listinfo/mpls</a><br>
</blockquote></div>
</blockquote></div></div></div></div>
</blockquote></div></div></div>
</blockquote></div>

--000000000000093c6d05786eb659--


From nobody Thu Oct 18 19:13:51 2018
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Subject: [mpls] I-D Action: draft-ietf-mpls-sr-over-ip-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 WG of the IETF.

        Title           : SR-MPLS over IP
        Authors         : Xiaohu Xu
                          Stewart Bryant
                          Adrian Farrel
                          Syed Hassan
                          Wim Henderickx
                          Zhenbin Li
	Filename        : draft-ietf-mpls-sr-over-ip-01.txt
	Pages           : 15
	Date            : 2018-10-18

Abstract:
   MPLS Segment Routing (SR-MPLS) is an MPLS data plane-based source
   routing paradigm in which the sender of a packet is allowed to
   partially or completely specify the route the packet takes through
   the network by imposing stacked MPLS labels on the packet.  SR-MPLS
   could be leveraged to realize a source routing mechanism across MPLS,
   IPv4, and IPv6 data planes by using an MPLS label stack as a source
   routing instruction set while preserving backward compatibility with
   SR-MPLS.

   This document describes how SR-MPLS capable routers and IP-only
   routers can seamlessly co-exist and interoperate through the use of
   SR-MPLS label stacks and IP encapsulation/tunneling such as MPLS-in-
   UDP as defined in RFC 7510.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-sr-over-ip/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-mpls-sr-over-ip-01
https://datatracker.ietf.org/doc/html/draft-ietf-mpls-sr-over-ip-01

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-sr-over-ip-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 Oct 19 11:58:38 2018
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Subject: [mpls] mpls - Requested sessions have been scheduled for IETF 103
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Dear Tarek Saad,

The session(s) that you have requested have been scheduled.
Below is the scheduled session information followed by
the original request. 


    mpls Session 1 (2:00 requested)
    Tuesday, 6 November 2018, Afternoon Session I 1350-1550
    Room Name: Meeting 1 size: 150
    ---------------------------------------------
    mpls Session 2 (1:00 requested)
    Wednesday, 7 November 2018, Morning Session II 1120-1220
    Room Name: Chitlada 3 size: 200
    ---------------------------------------------


iCalendar: https://datatracker.ietf.org/meeting/103/sessions/mpls.ics

Request Information:


---------------------------------------------------------
Working Group Name: Multiprotocol Label Switching
Area Name: Routing Area
Session Requester: Tarek Saad

Number of Sessions: 2
Length of Session(s):  2 Hours, 1 Hour
Number of Attendees: 100
Conflicts to Avoid: 
 First Priority: teas ccamp pce spring bess bfd idr pals bier detnet
 Second Priority: nvo3 sfc i2rs rtgarea rtgwg lsvr lsr



People who must be present:
  George Swallow
  Loa Andersson
  Deborah Brungard
  Nicolai Leymann
  Tarek Saad

Resources Requested:

Special Requests:
  
---------------------------------------------------------


From nobody Sat Oct 20 11:25:42 2018
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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 WG of the IETF.

        Title           : MPLS Egress Protection Framework
        Authors         : Yimin Shen
                          Minto Jeyananth
                          Bruno Decraene
                          Hannes Gredler
                          Carsten Michel
                          Huaimo Chen
                          Yuanlong Jiang
	Filename        : draft-ietf-mpls-egress-protection-framework-03.txt
	Pages           : 28
	Date            : 2018-10-20

Abstract:
   This document specifies a fast reroute framework for protecting IP/
   MPLS services and MPLS transport tunnels against egress node and
   egress link failures.  In this framework, the penultimate-hop router
   of an MPLS tunnel acts as the point of local repair (PLR) for an
   egress node failure, and the egress router of the MPLS tunnel acts as
   the PLR for an egress link failure.  Each of them pre-establishes a
   bypass tunnel to a protector.  Upon an egress node or link failure,
   the corresponding PLR performs local failure detection and local
   repair, by rerouting packets over the corresponding bypass tunnel.
   The protector in turn performs context label switching or context IP
   forwarding to send the packets to the ultimate service
   destination(s).  This mechanism can be used to reduce traffic loss
   before global repair reacts to the failure and control plane
   protocols converge on the topology changes due to the failure.  The
   framework is applicable to all types of IP/MPLS services and MPLS
   tunnels.  Under the framework, service protocol extensions may be
   further specified to support service label distribution from an
   egress router to a protector.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-mpls-egress-protection-framework/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-mpls-egress-protection-framework-03
https://datatracker.ietf.org/doc/html/draft-ietf-mpls-egress-protection-framework-03

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-egress-protection-framework-03


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

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


From nobody Sun Oct 21 22:40:10 2018
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Subject: [mpls] Publication has been requested for draft-ietf-mpls-egress-protection-framework-03
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Loa Andersson has requested publication of draft-ietf-mpls-egress-protection-framework-03 as Proposed Standard on behalf of the MPLS working group.

Please verify the document's state at https://datatracker.ietf.org/doc/draft-ietf-mpls-egress-protection-framework/


From nobody Sun Oct 21 23:08:32 2018
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From: Mach Chen <mach.chen@huawei.com>
To: Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>
CC: "draft-malis-mpls-sfc-encapsulation@ietf.org" <draft-malis-mpls-sfc-encapsulation@ietf.org>, "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>
Thread-Topic: [mpls] Working Group Adoption poll on draft-malis-mpls-sfc-encapsulation
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Date: Mon, 22 Oct 2018 06:08:22 +0000
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Subject: Re: [mpls] Working Group Adoption poll on draft-malis-mpls-sfc-encapsulation
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Yes/support.

Best regards,
Mach

> -----Original Message-----
> From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Loa Andersson
> Sent: Tuesday, October 16, 2018 12:48 AM
> To: mpls@ietf.org
> Cc: draft-malis-mpls-sfc-encapsulation@ietf.org; mpls-chairs@ietf.org
> Subject: [mpls] Working Group Adoption poll on draft-malis-mpls-sfc-
> encapsulation
>=20
> Working Group,
>=20
> This is to start a two week poll on adopting draft-malis-mpls-sfc-
> encapsulation
> as a 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 fo=
r 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 against this document.
>=20
> The authors have all stated on the MPLS wg mailing list that they are una=
ware
> of any IPRs that relate to this document.
>=20
> The working group adoption poll ends October 30, 2018.
>=20
> /Loa
> mpls wg co-chair
> --
>=20
>=20
> Loa Andersson                        email: loa@pi.nu
> Senior MPLS Expert
> Bronze Dragon Consulting             phone: +46 739 81 21 64
>=20
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls


From nobody Mon Oct 22 09:38:18 2018
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Subject: [mpls] I-D Action: draft-ietf-mpls-ldp-yang-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 WG of the IETF.

        Title           : YANG Data Model for MPLS LDP
        Authors         : Kamran Raza
                          Rajiv Asati
                          Xufeng Liu
                          Santosh Esale
                          Xia Chen
                          Himanshu Shah
	Filename        : draft-ietf-mpls-ldp-yang-05.txt
	Pages           : 97
	Date            : 2018-10-22

Abstract:
   This document describes a YANG data model for Multi-Protocol Label
   Switching (MPLS) Label Distribution Protocol (LDP).  The model also
   serves as the base model to define Multipoint LDP (mLDP) model.

   The YANG modules in this document conform to the Network Management
   Datastore Architecture (NMDA).


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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-mpls-ldp-yang-05
https://datatracker.ietf.org/doc/html/draft-ietf-mpls-ldp-yang-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-ldp-yang-05


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From nobody Mon Oct 22 09:44:12 2018
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From: "Kamran Raza (skraza)" <skraza@cisco.com>
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CC: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "draft-ietf-mpls-ldp-yang@ietf.org" <draft-ietf-mpls-ldp-yang@ietf.org>
Thread-Topic: LDP YANG rev -05 posted [Re: [mpls] WGLC for draft-ietf-mpls-ldp-yang]
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From nobody Mon Oct 22 10:18:09 2018
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Subject: [mpls] I-D Action: draft-ietf-mpls-mldp-yang-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 WG of the IETF.

        Title           : YANG Data Model for MPLS mLDP
        Authors         : Kamran Raza
                          Xufeng Liu
                          Santosh Esale
                          Loa Andersson
                          Jeff Tantsura
                          Sowmya Krishnaswamy
	Filename        : draft-ietf-mpls-mldp-yang-05.txt
	Pages           : 69
	Date            : 2018-10-22

Abstract:
   This document describes a YANG data model for Multi-Protocol Label
   Switching (MPLS) Multipoint Label Distribution Protocol (mLDP).  The
   mLDP data model augments the LDP data model.

   The YANG modules in this document conform to the Network Management
   Datastore Architecture (NMDA).


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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-mpls-mldp-yang-05
https://datatracker.ietf.org/doc/html/draft-ietf-mpls-mldp-yang-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-mldp-yang-05


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

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From nobody Mon Oct 22 10:21:40 2018
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From: "Kamran Raza (skraza)" <skraza@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, "draft-ietf-mpls-mldp-yang@ietf.org" <draft-ietf-mpls-mldp-yang@ietf.org>
CC: "mpls@ietf.org" <mpls@ietf.org>, YANG Doctors <yang-doctors@ietf.org>
Thread-Topic: mLDP YANG ID rev -05 uploaded [Re: [mpls] YANG Doctor Early Review for "YANG Data Model for MPLS mLDP" - draft-ietf-mpls-mldp-yang-03]
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--_000_39961B31E98043069C7CFE910C90AB29ciscocom_--


From nobody Mon Oct 22 12:03:40 2018
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Subject: [mpls] I-D Action: draft-ietf-mpls-rmr-08.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 WG of the IETF.

        Title           : Resilient MPLS Rings
        Authors         : Kireeti Kompella
                          Luis M. Contreras
	Filename        : draft-ietf-mpls-rmr-08.txt
	Pages           : 14
	Date            : 2018-10-22

Abstract:
   This document describes the use of the MPLS control and data planes
   on ring topologies.  It describes the special nature of rings, and
   proceeds to show how MPLS can be effectively used in such topologies.
   It describes how MPLS rings are configured, auto-discovered and
   signaled, as well as how the data plane works.  Companion documents
   describe the details of discovery and signaling for specific
   protocols.



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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-mpls-rmr-08
https://datatracker.ietf.org/doc/html/draft-ietf-mpls-rmr-08

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-rmr-08


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 Tue Oct 23 00:15:11 2018
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From: Loa Andersson <loa@pi.nu>
To: "mpls@ietf.org" <mpls@ietf.org>
Cc: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "draft-ietf-mpls-rmr@ietf.org" <draft-ietf-mpls-rmr@ietf.org>, Deborah A Brungard <db3546@att.com>
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Subject: [mpls] IPR poll on draft-ietf-mpls-rmr
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Working Group,

We are currently preparing draft draft-ietf-mpls-rmr for working
group last call.

Part of this preparation is to do an IPR poll.

This mail is to start the IPR poll.

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

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

There is one IPR disclosures directly against draft-ietf-mpls-rmr.

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@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


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From: LUIS MIGUEL CONTRERAS MURILLO <luismiguel.contrerasmurillo@telefonica.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/8SRnQCEPdxO3EFxTK_b1aY4wQdg>
Subject: Re: [mpls] IPR poll on draft-ietf-mpls-rmr
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From nobody Tue Oct 23 03:26:53 2018
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Subject: [mpls] I-D Action: draft-ietf-mpls-lsp-ping-lag-multipath-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 WG of the IETF.

        Title           : Label Switched Path (LSP) Ping/Trace Multipath Support for Link Aggregation Group (LAG) Interfaces
        Authors         : Nobo Akiya
                          George Swallow
                          Stephane Litkowski
                          Bruno Decraene
                          John E. Drake
                          Mach(Guoyi) Chen
	Filename        : draft-ietf-mpls-lsp-ping-lag-multipath-05.txt
	Pages           : 27
	Date            : 2018-10-23

Abstract:
   This document defines extensions to the MPLS Label Switched Path
   (LSP) Ping and Traceroute mechanisms as specified in RFC 8029.  The
   extensions allow the MPLS LSP Ping and Traceroute mechanisms to
   discover and exercise specific paths of Layer 2 (L2) Equal-Cost
   Multipath (ECMP) over Link Aggregation Group (LAG) interfaces.
   Additionally, a mechanism is defined to enable determination of the
   capabilities of an LSR supported.

   This document updates RFC8029.



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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-mpls-lsp-ping-lag-multipath-05
https://datatracker.ietf.org/doc/html/draft-ietf-mpls-lsp-ping-lag-multipath-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-lsp-ping-lag-multipath-05


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

Internet-Drafts are also available by anonymous FTP at:
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Subject: Re: [mpls] IPR poll on draft-ietf-mpls-sfc
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I cannot remember if I replied on this or not.

I am not aware of any IPR that needs to be declared relating to this draft.

- Stewart


On 17/10/2018 15:47, Loa Andersson wrote:
> Working group,
>
> there was a copy and paste mistake in the first mail that did go ut,
> this is the correct text.
>
> /Loa
> On 2018-10-17 22:44, Loa Andersson wrote:
>> Working Group,
>>
>> We are currently preparing draft draft-ietf-mpls-sfc for working
>> group last call.
>>
>> Part of this preparation is to do an IPR poll.
>>
>> This mail is to start the IPR poll.
>>
>> Are you aware of any IPR that applies to draft-ietf-mpls-sfc?
>>
>> If so, has this IPR been disclosed in compliance with IETF IPR rules
>> (see RFCs 3979, 4879, 3669 and 5378 for more details).
>>
>> There are no IPR disclosures directly against draft-ietf-mpls-sfc.
>>
>> 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
>


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From: "Tarek Saad (tsaad)" <tsaad@cisco.com>
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Thread-Topic: MPLS agenda requests for IETF 103 in Bangkok
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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Wed, 24 Oct 2018 07:07:18 -0400
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To: Stewart Bryant <stewart.bryant@gmail.com>
Cc: Loa Andersson <loa@pi.nu>, mpls@ietf.org, mpls-chairs <mpls-chairs@ietf.org>, draft-ietf-mpls-sfc@ietf.org
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Subject: Re: [mpls] IPR poll on draft-ietf-mpls-sfc
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I'm also not aware of any IPR related to this draft.

Cheers,
Andy


On Tue, Oct 23, 2018 at 10:25 AM Stewart Bryant <stewart.bryant@gmail.com>
wrote:

> I cannot remember if I replied on this or not.
>
> I am not aware of any IPR that needs to be declared relating to this draft.
>
> - Stewart
>
>
> On 17/10/2018 15:47, Loa Andersson wrote:
> > Working group,
> >
> > there was a copy and paste mistake in the first mail that did go ut,
> > this is the correct text.
> >
> > /Loa
> > On 2018-10-17 22:44, Loa Andersson wrote:
> >> Working Group,
> >>
> >> We are currently preparing draft draft-ietf-mpls-sfc for working
> >> group last call.
> >>
> >> Part of this preparation is to do an IPR poll.
> >>
> >> This mail is to start the IPR poll.
> >>
> >> Are you aware of any IPR that applies to draft-ietf-mpls-sfc?
> >>
> >> If so, has this IPR been disclosed in compliance with IETF IPR rules
> >> (see RFCs 3979, 4879, 3669 and 5378 for more details).
> >>
> >> There are no IPR disclosures directly against draft-ietf-mpls-sfc.
> >>
> >> 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
> >
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

--000000000000f82b5c0578f77d51
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<div dir=3D"ltr">I&#39;m also not aware of any IPR related to this draft.<d=
iv><br></div><div>Cheers,</div><div>Andy</div><div><br></div></div><br><div=
 class=3D"gmail_quote"><div dir=3D"ltr">On Tue, Oct 23, 2018 at 10:25 AM St=
ewart Bryant &lt;<a href=3D"mailto:stewart.bryant@gmail.com">stewart.bryant=
@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I cannot=
 remember if I replied on this or not.<br>
<br>
I am not aware of any IPR that needs to be declared relating to this draft.=
<br>
<br>
- Stewart<br>
<br>
<br>
On 17/10/2018 15:47, Loa Andersson wrote:<br>
&gt; Working group,<br>
&gt;<br>
&gt; there was a copy and paste mistake in the first mail that did go ut,<b=
r>
&gt; this is the correct text.<br>
&gt;<br>
&gt; /Loa<br>
&gt; On 2018-10-17 22:44, Loa Andersson wrote:<br>
&gt;&gt; Working Group,<br>
&gt;&gt;<br>
&gt;&gt; We are currently preparing draft draft-ietf-mpls-sfc for working<b=
r>
&gt;&gt; group last call.<br>
&gt;&gt;<br>
&gt;&gt; Part of this preparation is to do an IPR poll.<br>
&gt;&gt;<br>
&gt;&gt; This mail is to start the IPR poll.<br>
&gt;&gt;<br>
&gt;&gt; Are you aware of any IPR that applies to draft-ietf-mpls-sfc?<br>
&gt;&gt;<br>
&gt;&gt; If so, has this IPR been disclosed in compliance with IETF IPR rul=
es<br>
&gt;&gt; (see RFCs 3979, 4879, 3669 and 5378 for more details).<br>
&gt;&gt;<br>
&gt;&gt; There are no IPR disclosures directly against draft-ietf-mpls-sfc.=
<br>
&gt;&gt;<br>
&gt;&gt; If you are listed as a document author or contributor please respo=
nd to<br>
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ant<br>
&gt;&gt; IPR. *The response needs to be sent to the MPLS WG mailing list.* =
The<br>
&gt;&gt; document will not advance to the next stage until a response has b=
een<br>
&gt;&gt; received from each author and contributor.<br>
&gt;&gt;<br>
&gt;&gt; If you are on the MPLS WG email list but are not listed as an auth=
or or<br>
&gt;&gt; contributor, then please explicitly respond only if you are aware =
of any<br>
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.<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; /Loa<br>
&gt;&gt; =C2=A0=C2=A0mpls wg co-chair<br>
&gt;<br>
<br>
_______________________________________________<br>
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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Wed, 24 Oct 2018 12:17:11 -0400
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Subject: [mpls] MPLS-RT review of draft-mirsky-mpls-p2mp-bfd-04
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I=E2=80=99ve been selected as an MPLS-RT reviewer for
draft-mirsky-mpls-p2mp-bfd-04, which is currently a candidate for MPLS WG
adoption. This draft documents procedures for using BFD for multipoint
networks to detect data plane failures in MPLS p2mp LSPs.

The BFD WG has been working on draft-ietf-bfd-multipoint, which describes
BFD procedures for multipoint and multicast networks.
draft-mirsky-mpls-p2mp-bfd uses that draft as a basis to detect MPLS data
plane failures for p2mp LSPs. This is a straightforward and useful
application of the BFD draft for MPLS data plane failure detection.

However, I would have expected to see at least a reference to RFC 4687,
"Operations and Management (OAM) Requirements for Point-to-Multipoint MPLS
Networks", and some text on how this draft addresses the requirements in
that draft.

I also expected more text on the relationship between this draft and RFC
6425, "Detecting Data-Plane Failures in Point-to-Multipoint MPLS -
Extensions to LSP Ping"', and more of an explanation of why the keyword MAY
is used in sections 4.1 and 4.2 - what are the implications of following or
not following the MAY in each case?

The draft also needs an editing pass, for example "MaultipointHead"
for "MultipointHead"
and some incorrect English grammar in several places.

Once these items have been addressed, I think that the draft should be
ready for an adoption call.

Cheers,
Andy

--00000000000030efae0578fbd220
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div di=
r=3D"ltr"><div dir=3D"ltr">I=E2=80=99ve been selected as an=C2=A0<span clas=
s=3D"gmail-il">MPLS</span>-<span class=3D"gmail-il">RT</span>=C2=A0reviewer=
 for draft-mirsky-mpls-p2mp-bfd-04, which is currently a candidate for=C2=
=A0<span class=3D"gmail-il">MPLS</span>=C2=A0WG adoption. This draft docume=
nts procedures for using BFD for multipoint networks to detect data plane f=
ailures in MPLS p2mp LSPs.<div><br></div><div>The BFD WG has been working o=
n=C2=A0draft-ietf-bfd-multipoint, which describes BFD procedures for multip=
oint and multicast networks. draft-mirsky-mpls-p2mp-bfd uses that draft as =
a basis to detect MPLS data plane failures for p2mp LSPs. This is a straigh=
tforward and useful application of the BFD draft for MPLS data plane failur=
e detection.</div><div><br></div><div>However, I would have expected to see=
 at least a reference to RFC 4687, &quot;Operations and Management (OAM) Re=
quirements for Point-to-Multipoint MPLS Networks&quot;, and some text on ho=
w this draft addresses the requirements in that draft.</div><div><br></div>=
<div>I also expected more text on the relationship between this draft and R=
FC 6425, &quot;Detecting Data-Plane Failures in Point-to-Multipoint MPLS - =
Extensions to LSP Ping&quot;&#39;, and more of an explanation of why the ke=
yword MAY is used in sections 4.1 and 4.2 - what are the implications of fo=
llowing or not following the MAY in each case?</div><div><br></div><div>The=
 draft also needs an editing pass, for example &quot;<span style=3D"color:r=
gb(0,0,0);font-size:13.3333px">MaultipointHead&quot; for &quot;</span><span=
 style=3D"color:rgb(0,0,0);font-size:13.3333px">MultipointHead&quot; and so=
me incorrect English grammar in several places.</span></div><div><br></div>=
<div>Once these items have been addressed, I think that the draft should be=
 ready for an adoption call.</div><div><br></div><div>Cheers,</div><div>And=
y</div><div><br></div><div><span style=3D"color:rgb(0,0,0);font-size:13.333=
3px"><br></span></div></div></div></div></div></div></div>

--00000000000030efae0578fbd220--


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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Wed, 24 Oct 2018 11:11:49 -0700
Message-ID: <CA+RyBmVLDKOsaJhDzdDKmF9WEk1Hwg7-LN25onVdK3fXk7bHSw@mail.gmail.com>
To: "Andrew G. Malis" <agmalis@gmail.com>
Cc: mpls-chairs@ietf.org, draft-mirsky-mpls-p2mp-bfd@ietf.org, mpls@ietf.org
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/Jw24ztrN6EgPD4ZtkXRjrF6dEHY>
Subject: Re: [mpls] MPLS-RT review of draft-mirsky-mpls-p2mp-bfd-04
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Dear Andy,
thank you for your thorough review and the most helpful comments. I'll work
on the update to address them.

Regards,
Greg

On Wed, Oct 24, 2018 at 9:17 AM Andrew G. Malis <agmalis@gmail.com> wrote:

> I=E2=80=99ve been selected as an MPLS-RT reviewer for
> draft-mirsky-mpls-p2mp-bfd-04, which is currently a candidate for MPLS WG
> adoption. This draft documents procedures for using BFD for multipoint
> networks to detect data plane failures in MPLS p2mp LSPs.
>
> The BFD WG has been working on draft-ietf-bfd-multipoint, which describes
> BFD procedures for multipoint and multicast networks.
> draft-mirsky-mpls-p2mp-bfd uses that draft as a basis to detect MPLS data
> plane failures for p2mp LSPs. This is a straightforward and useful
> application of the BFD draft for MPLS data plane failure detection.
>
> However, I would have expected to see at least a reference to RFC 4687,
> "Operations and Management (OAM) Requirements for Point-to-Multipoint MPL=
S
> Networks", and some text on how this draft addresses the requirements in
> that draft.
>
> I also expected more text on the relationship between this draft and RFC
> 6425, "Detecting Data-Plane Failures in Point-to-Multipoint MPLS -
> Extensions to LSP Ping"', and more of an explanation of why the keyword M=
AY
> is used in sections 4.1 and 4.2 - what are the implications of following =
or
> not following the MAY in each case?
>
> The draft also needs an editing pass, for example "MaultipointHead" for "=
MultipointHead"
> and some incorrect English grammar in several places.
>
> Once these items have been addressed, I think that the draft should be
> ready for an adoption call.
>
> Cheers,
> Andy
>
>
>

--000000000000204c3b0578fd6ca4
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<div dir=3D"ltr">Dear Andy,<div>thank you for your thorough review and the =
most helpful comments. I&#39;ll work on the update to address them.</div><d=
iv><br></div><div>Regards,</div><div>Greg</div></div><br><div class=3D"gmai=
l_quote"><div dir=3D"ltr">On Wed, Oct 24, 2018 at 9:17 AM Andrew G. Malis &=
lt;<a href=3D"mailto:agmalis@gmail.com">agmalis@gmail.com</a>&gt; wrote:<br=
></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-=
left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div dir=3D"ltr"><di=
v dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr">I=E2=80=99=
ve been selected as an=C2=A0<span class=3D"m_-1369470530874045245gmail-il">=
MPLS</span>-<span class=3D"m_-1369470530874045245gmail-il">RT</span>=C2=A0r=
eviewer for draft-mirsky-mpls-p2mp-bfd-04, which is currently a candidate f=
or=C2=A0<span class=3D"m_-1369470530874045245gmail-il">MPLS</span>=C2=A0WG =
adoption. This draft documents procedures for using BFD for multipoint netw=
orks to detect data plane failures in MPLS p2mp LSPs.<div><br></div><div>Th=
e BFD WG has been working on=C2=A0draft-ietf-bfd-multipoint, which describe=
s BFD procedures for multipoint and multicast networks. draft-mirsky-mpls-p=
2mp-bfd uses that draft as a basis to detect MPLS data plane failures for p=
2mp LSPs. This is a straightforward and useful application of the BFD draft=
 for MPLS data plane failure detection.</div><div><br></div><div>However, I=
 would have expected to see at least a reference to RFC 4687, &quot;Operati=
ons and Management (OAM) Requirements for Point-to-Multipoint MPLS Networks=
&quot;, and some text on how this draft addresses the requirements in that =
draft.</div><div><br></div><div>I also expected more text on the relationsh=
ip between this draft and RFC 6425, &quot;Detecting Data-Plane Failures in =
Point-to-Multipoint MPLS - Extensions to LSP Ping&quot;&#39;, and more of a=
n explanation of why the keyword MAY is used in sections 4.1 and 4.2 - what=
 are the implications of following or not following the MAY in each case?</=
div><div><br></div><div>The draft also needs an editing pass, for example &=
quot;<span style=3D"color:rgb(0,0,0);font-size:13.3333px">MaultipointHead&q=
uot; for &quot;</span><span style=3D"color:rgb(0,0,0);font-size:13.3333px">=
MultipointHead&quot; and some incorrect English grammar in several places.<=
/span></div><div><br></div><div>Once these items have been addressed, I thi=
nk that the draft should be ready for an adoption call.</div><div><br></div=
><div>Cheers,</div><div>Andy</div><div><br></div><div><span style=3D"color:=
rgb(0,0,0);font-size:13.3333px"><br></span></div></div></div></div></div></=
div></div>
</blockquote></div>

--000000000000204c3b0578fd6ca4--


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From: Shraddha Hegde <shraddha@juniper.net>
To: "Tarek Saad (tsaad)" <tsaad@cisco.com>, "mpls@ietf.org" <mpls@ietf.org>
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Thread-Topic: MPLS agenda requests for IETF 103 in Bangkok
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/3ukCA4nenC7VYwfKPhXKiSTlawY>
Subject: Re: [mpls] MPLS agenda requests for IETF 103 in Bangkok
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--_000_BYAPR05MB39436067B71F85B48E3E1BC6D5F70BYAPR05MB3943namp_--


From nobody Wed Oct 24 23:04:10 2018
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To: Shraddha Hegde <shraddha@juniper.net>, "Tarek Saad (tsaad)" <tsaad@cisco.com>, "mpls@ietf.org" <mpls@ietf.org>
Cc: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>
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From: Loa Andersson <loa@pi.nu>
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Date: Thu, 25 Oct 2018 14:03:56 +0800
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/pQPrcWVZrFa06MIxAacfWvTC0gw>
Subject: Re: [mpls] MPLS agenda requests for IETF 103 in Bangkok
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Shraddha, and anyone else who has requested slots at the mpls f2f,

We, the wg-chairs and secreatary, had a meeting to discuss the
preliminary agenda.

Tarek will post it today (Thursday) during working hours in the US.

A note will be sent to the wg mailing list. When the not goes out
check that your request is correctly captured.

Having said that, I can say that both slots Shraddha requested are
on the preliminary agenda, though the eorder of the pressentations
might be changed.


/Loa

On 2018-10-25 13:51, Shraddha Hegde wrote:
> Hi Tarek,
> 
> I had sent below request a week back.I did not see an ack so sending it 
> again.
> 
> Also I could not see the mpls agenda has details in below link
> 
> https://datatracker.ietf.org/meeting/103/agenda.html 
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__datatracker.ietf.org_meeting_103_agenda.html&d=DwMGaQ&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&m=yLI1zSBOwrt6YFvFXelSRON6R4h0WB9hh5z2dXw2Ob0&s=8CQJwT0gw6ChjOi68YYCYwKVTfnc29ebhOgwVdp3mL4&e=>
> 
> Topic: TTL procedures for SR-TE Paths
> 
> Draft: draft-arora-mpls-spring-ttl-procedures-srte-paths-00.
> 
> Presenter: Shraddha Hegde
> 
> Duration: 15 mins
> 
> Topic: EPE OAM
> 
> Draft: draft-hegde-mpls-spring-epe-oam-00
> 
> Presenter:Shraddha Hegde
> 
> Duration: 5 mins
> 
> Rgds
> 
> Shraddha
> 
> *From:*mpls <mpls-bounces@ietf.org> *On Behalf Of *Tarek Saad (tsaad)
> *Sent:* Wednesday, October 24, 2018 8:48 AM
> *To:* mpls@ietf.org
> *Cc:* mpls-chairs@ietf.org
> *Subject:* Re: [mpls] MPLS agenda requests for IETF 103 in Bangkok
> 
> Hi all,
> 
> Reminder to send your requests for slot presentation for the MPLS WG 
> sessions below by this Friday Oct 26 so we can include it on the Agenda.
> 
> https://datatracker.ietf.org/meeting/103/agenda.html 
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__datatracker.ietf.org_meeting_103_agenda.html&d=DwMGaQ&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&m=yLI1zSBOwrt6YFvFXelSRON6R4h0WB9hh5z2dXw2Ob0&s=8CQJwT0gw6ChjOi68YYCYwKVTfnc29ebhOgwVdp3mL4&e=>
> 
> The MPLS WG session is currently scheduled for the 2 sessions below:
> 
> Tuesday, November 6, 13:50-15:50 (+07) Afternoon session I
> 
> Wednesday November 7, 11:20-12:20 (+07) Morning session II
> 
> Regards,
> 
> Tarek
> 
> **
> 
> *===========*
> 
> **
> 
> Hi all,
> 
> We are building the MPLS WG session’s agenda for IETF103 in Bangkok. The 
> preliminary agenda for IETF103, is available at:
> 
> https://datatracker.ietf.org/meeting/103/agenda.html 
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__datatracker.ietf.org_meeting_103_agenda.html&d=DwMGaQ&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&m=yLI1zSBOwrt6YFvFXelSRON6R4h0WB9hh5z2dXw2Ob0&s=8CQJwT0gw6ChjOi68YYCYwKVTfnc29ebhOgwVdp3mL4&e=>
> 
> The MPLS WG session is currently scheduled for the 2 sessions below:
> 
> Tuesday, November 6, 13:50-15:50 (+07) Afternoon session I
> 
> Wednesday November 7, 11:20-12:20 (+07) Morning session II
> 
> Please send slot requests for presenting at the MPLS session copying 
> myself and the WG chairs - indicate draft name, speaker and desired 
> duration.
> 
> If presenting, your slides will be due by Friday July 13th. Please send 
> slides to myself and the WG chairs.
> 
> A reminder to authors/editors of MPLS WG drafts that will not be 
> discussed/presented at IET103 to send a status report to the WG list by 
> Friday Oct 26th so it can be included in the MPLS WG progress report.
> 
> Important dates:
> 
> 2018-10-12 (Friday): Final agenda to be published.
> 
> 2018-10-22 (Monday): Internet Draft submission cut-off (for all drafts, 
> including -00) by UTC 23:59.
> 
> 2018-10-22 (Monday): Standard rate registration and payment cut-off at 
> UTC 23:59..
> 
> 2018-10-24 (Wednesday): Draft Working Group agendas due by UTC 23:59.
> 
> 2018-10-29 (Monday): Registration cancellation cut-off at UTC 23:59.
> 
> 2018-10-29 (Monday): Revised Working Group agendas due by UTC 23:59.
> 
> 2018-11-30 (Friday): Proceedings submission cutoff date by UTC 23:59.
> 
> 2018-12-24 (Monday): Proceedings submission corrections cutoff date by 
> UTC 23:59.
> 
> Regards,
> 
> Tarek and MPLS WG chairs
> 
> 
> 
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
> 

-- 


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Fri, 26 Oct 2018 09:56:09 -0700
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Subject: [mpls] BFD in Demand mode over p2p MPLS tunnels
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Dear All,
this work has been presented to MPLS WG, and I think it is of interest to
you to learn that the call for adoption by BFD WG is ongoing. Please
consider sharing your comments on BFD WG list.

Regards,
Greg

Working Group,

The BFD chairs have received an adoption request for
"BFD in Demand Mode over Point-to-Point MPLS LSP"
(draft-mirsky-bfd-mpls-demand).
https://datatracker.ietf.org/doc/draft-mirsky-bfd-mpls-demand/

The adoption call will end on the Friday after IETF 103, November 9.

Note that there is are existing IPR statements on this
draft:https://datatracker.ietf.org/ipr/3301/https://datatracker.ietf.org/ipr/3104/

Please indicate to the mailing list whether you support adoption of this
draft.

-- Jeff & Reshad

--00000000000036038d0579249967
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Dear All,</div><div>this work has been presented to M=
PLS WG, and I think it is of interest to you to learn that the call for ado=
ption by BFD WG is ongoing. Please consider sharing your comments on BFD WG=
 list.</div><div><br></div><div>Regards,</div><div>Greg</div><div><br></div=
><div><pre class=3D"gmail-wordwrap" style=3D"box-sizing:border-box;overflow=
:auto;font-family:Menlo,Monaco,Consolas,&quot;Courier New&quot;,monospace;f=
ont-size:13px;padding:0px;margin-top:0px;margin-bottom:10px;line-height:1.4=
2857;word-break:normal;color:rgb(51,51,51);border:0px none black;border-rad=
ius:4px;white-space:pre-wrap">Working Group,

The BFD chairs have received an adoption request for=20
&quot;BFD in Demand Mode over Point-to-Point MPLS LSP&quot;
(draft-mirsky-bfd-mpls-demand).

<a href=3D"https://datatracker.ietf.org/doc/draft-mirsky-bfd-mpls-demand/" =
rel=3D"nofollow" style=3D"box-sizing:border-box;background-color:transparen=
t;color:rgb(51,122,183);text-decoration-line:none">https://datatracker.ietf=
.org/doc/draft-mirsky-bfd-mpls-demand/</a>

The adoption call will end on the Friday after IETF 103, November 9.

Note that there is are existing IPR statements on this draft:
<a href=3D"https://datatracker.ietf.org/ipr/3301/" rel=3D"nofollow" style=
=3D"box-sizing:border-box;background-color:transparent;color:rgb(51,122,183=
);text-decoration-line:none">https://datatracker.ietf.org/ipr/3301/</a>
<a href=3D"https://datatracker.ietf.org/ipr/3104/" rel=3D"nofollow" style=
=3D"box-sizing:border-box;background-color:transparent;color:rgb(51,122,183=
);text-decoration-line:none">https://datatracker.ietf.org/ipr/3104/</a>

Please indicate to the mailing list whether you support adoption of this
draft.

-- Jeff &amp; Reshad</pre></div></div>

--00000000000036038d0579249967--


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To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, "stephane.litkowski@orange.com" <stephane.litkowski@orange.com>
Cc: "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "'mpls@ietf.org'" <mpls@ietf.org>,  "'adrian@olddog.co.uk'" <adrian@olddog.co.uk>, "Jonathan Hardwick (Jonathan.Hardwick@metaswitch.com)" <jonathan.hardwick@metaswitch.com>, "shraddha@juniper.net" <shraddha@juniper.net>, "spring@ietf.org" <spring@ietf.org>, "spring-chairs@ietf.org" <spring-chairs@ietf.org>, "draft-ietf-spring-segment-routing-mpls.authors@ietf.org" <draft-ietf-spring-segment-routing-mpls.authors@ietf.org>
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From: Ahmed Bashandy <abashandy.ietf@gmail.com>
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Subject: Re: [mpls] RtgDir Early review: draft-ietf-spring-segment-routing-mpls-13
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This is a multi-part message in MIME format.
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Sasha

I uploaded version 15. But I was not sure how to best address your concern

So Please propose the wording/modifications that looks reasonable to you 
and I will be more than happy to incorporate them

Ahmed


On 7/25/18 12:20 AM, Alexander Vainshtein wrote:
>
> Stephane,
>
> Lots of thanks for your email, and apologies for a long delayed response.
>
> Regarding you reference to “BGP 3107 label over an LDP label over an 
> RSVP label to build an end-to-end transport”, I have looked up RFC 
> 8277 <https://tools.ietf.org/html/rfc8277>  that has replaced RFC 
> 3107, and found there the following */explicit/* statement:
>
>    When pushing labels onto a packet's label stack, the Time-to-Live
>    (TTL) field ([RFC3032 <https://tools.ietf.org/html/rfc3032>], 
> [RFC3443 <https://tools.ietf.org/html/rfc3443>]) and the Traffic Class 
> (TC) field
>    ([RFC3032 <https://tools.ietf.org/html/rfc3032>], [RFC5462 
> <https://tools.ietf.org/html/rfc5462>]) of each label stack entry 
> must, of course, be
>    set.  This document does not specify any set of rules for setting
>    these fields; that is a matter of local policy.
>
> No equivalent of this statement could be found in RFC 3107 – probably 
> because RFC 3443 has not yet been published then.
>
> From my POV including the same (or equivalent) explicit statement in 
> the draft would be sufficient to resolve the issue.
>
> Hope this helps.
>
> Regards,
>
> Sasha
>
> Office: +972-39266302
>
> Cell: +972-549266302
>
> Email: Alexander.Vainshtein@ecitele.com
>
> *From:*stephane.litkowski@orange.com 
> [mailto:stephane.litkowski@orange.com]
> *Sent:* Wednesday, July 18, 2018 2:27 PM
> *To:* Ahmed Bashandy <abashandy.ietf@gmail.com>; Alexander Vainshtein 
> <Alexander.Vainshtein@ecitele.com>
> *Cc:* rtg-dir@ietf.org; 'mpls@ietf.org' <mpls@ietf.org>; 
> 'adrian@olddog.co.uk' <adrian@olddog.co.uk>; Jonathan Hardwick 
> (Jonathan.Hardwick@metaswitch.com) <jonathan.hardwick@metaswitch.com>; 
> shraddha@juniper.net; spring@ietf.org; spring-chairs@ietf.org; 
> draft-ietf-spring-segment-routing-mpls.authors@ietf.org
> *Subject:* RE: RtgDir Early review: 
> draft-ietf-spring-segment-routing-mpls-13
>
> Hi Sasha,
>
> >*/The head-end node sends SR-MPLS packets across a path defined by an 
> ordered set of SIDs with more than one SID in the list. Each SID is 
> represented by a label stack entry (LSE) in the MPLS label stack, and 
> the label field in each LSE is the label that matches the 
> corresponding SID. However, each LSE also includes the TTL and TC 
> fields. How does the head-end node set these fields in each of the 
> LSEs following the top one? This clearly depends on the model (Uniform 
> vs. Pipe/Short Pipe) implemented in each node that that performs Next 
> operation on the packet along the path – but the head-end node usually 
> is not aware of that. /*
>
> Why do you think this is different from a nested MPLS tunnel that 
> exists today ? I completely agree with you that the head end does not 
> know the behavior of the tail-end in term of TTL/TC processing. But 
> that’s already the case today, and it’s the job of engineers to ensure 
> that all nodes in the network are operating in the same mode (uniform 
> vs pipe/short pipe).
>
> We can already stack today a BGP 3107 label over an LDP label over an 
> RSVP label to build an end-to-end transport, the TTL processing should 
> not be essentially different.
>
> Could you pin point the difference that you see ?
>
> Brgds,
>
> Stephane
>
> *From:*Ahmed Bashandy [mailto:abashandy.ietf@gmail.com]
> *Sent:* Monday, July 16, 2018 22:03
> *To:* Alexander Vainshtein
> *Cc:* rtg-dir@ietf.org <mailto:rtg-dir@ietf.org>; 'mpls@ietf.org'; 
> 'adrian@olddog.co.uk'; Jonathan Hardwick 
> (Jonathan.Hardwick@metaswitch.com 
> <mailto:Jonathan.Hardwick@metaswitch.com>); shraddha@juniper.net 
> <mailto:shraddha@juniper.net>; spring@ietf.org 
> <mailto:spring@ietf.org>; spring-chairs@ietf.org 
> <mailto:spring-chairs@ietf.org>; 
> draft-ietf-spring-segment-routing-mpls.authors@ietf.org 
> <mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org>
> *Subject:* Re: RtgDir Early review: 
> draft-ietf-spring-segment-routing-mpls-13
>
> Thanks a lot for the reply
>
> See inline "##Ahmed"
>
> On 7/11/18 2:02 AM, Alexander Vainshtein wrote:
>
>     Ahmed, and all,
>
>     Lots of thanks for a detailed response to my comments.
>
>     Please see */inline below/*my position on each of them.
>
>     Regards,
>
>     Sasha
>
>     Office: +972-39266302
>
>     Cell: +972-549266302
>
>     Email: Alexander.Vainshtein@ecitele.com
>     <mailto:Alexander.Vainshtein@ecitele.com>
>
>     *From:*Ahmed Bashandy [mailto:abashandy.ietf@gmail.com]
>     *Sent:* Wednesday, July 11, 2018 4:42 AM
>     *To:* Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
>     <mailto:Alexander.Vainshtein@ecitele.com>; spring-chairs@ietf.org
>     <mailto:spring-chairs@ietf.org>;
>     draft-ietf-spring-segment-routing-mpls.authors@ietf.org
>     <mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org>
>     *Cc:* rtg-dir@ietf.org <mailto:rtg-dir@ietf.org>; 'mpls@ietf.org
>     <mailto:mpls@ietf.org>' <mpls@ietf.org> <mailto:mpls@ietf.org>;
>     'adrian@olddog.co.uk <mailto:adrian@olddog.co.uk>'
>     <adrian@olddog.co.uk> <mailto:adrian@olddog.co.uk>; Jonathan
>     Hardwick (Jonathan.Hardwick@metaswitch.com
>     <mailto:Jonathan.Hardwick@metaswitch.com>)
>     <jonathan.hardwick@metaswitch.com>
>     <mailto:jonathan.hardwick@metaswitch.com>; shraddha@juniper.net
>     <mailto:shraddha@juniper.net>; spring@ietf.org
>     <mailto:spring@ietf.org>
>     *Subject:* Re: RtgDir Early review:
>     draft-ietf-spring-segment-routing-mpls-13
>
>     Thanks for thorough (and VERY clear) the review
>
>     See inline #Ahmed
>
>     Ahmed
>
>     On 6/15/18 11:08 PM, Alexander Vainshtein wrote:
>
>         Re-sending to  correct SPRING WG list.
>
>         Sincere apologies for the delay caused by a typo.
>
>         Thumb typed by Sasha Vainshtein
>
>         ------------------------------------------------------------------------
>
>         *From:* Alexander Vainshtein
>         *Sent:* Sunday, June 10, 2018 10:43:52 AM
>         *To:* spring-chairs@ietf.org <mailto:spring-chairs@ietf.org>;
>         draft-ietf-spring-segment-routing-mpls.authors@ietf.org
>         <mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org>
>         *Cc:* spring@ietf.com <mailto:spring@ietf.com>;
>         rtg-dir@ietf.org <mailto:rtg-dir@ietf.org>; 'mpls@ietf.org
>         <mailto:mpls@ietf.org>'; 'adrian@olddog.co.uk
>         <mailto:adrian@olddog.co.uk>'; Jonathan Hardwick
>         (Jonathan.Hardwick@metaswitch.com
>         <mailto:Jonathan.Hardwick@metaswitch.com>);
>         shraddha@juniper.net <mailto:shraddha@juniper.net>
>         *Subject:* RE: RtgDir Early review:
>         draft-ietf-spring-segment-routing-mpls-13
>
>         Explicitly adding Shraddha  who is the shepherd of this draft.
>
>         Regards,
>
>         Sasha
>
>         Office: +972-39266302
>
>         Cell: +972-549266302
>
>         Email: Alexander.Vainshtein@ecitele.com
>         <mailto:Alexander.Vainshtein@ecitele.com>
>
>         *From:* Alexander Vainshtein
>         *Sent:* Friday, June 8, 2018 5:43 PM
>         *To:* 'spring-chairs@ietf.org <mailto:spring-chairs@ietf.org>'
>         <spring-chairs@ietf.org> <mailto:spring-chairs@ietf.org>;
>         'draft-ietf-spring-segment-routing-mpls.authors@ietf.org
>         <mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org>'
>         <draft-ietf-spring-segment-routing-mpls.authors@ietf.org>
>         <mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org>
>         *Cc:* 'spring@ietf.com <mailto:spring@ietf.com>'
>         <spring@ietf.com> <mailto:spring@ietf.com>; rtg-dir@ietf.org
>         <mailto:rtg-dir@ietf.org>; mpls@ietf.org
>         <mailto:mpls@ietf.org>; 'adrian@olddog.co.uk
>         <mailto:adrian@olddog.co.uk>' <adrian@olddog.co.uk>
>         <mailto:adrian@olddog.co.uk>
>         *Subject:* RtgDir Early review:
>         draft-ietf-spring-segment-routing-mpls-13
>
>         Hello,
>
>         I have been selected to do a routing directorate “early”
>         review of this draft:
>         https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/
>
>         The routing directorate will, on request from the working
>         group chair, perform an “early” review of a draft before it is
>         submitted for publication to the IESG. The early review can be
>         performed at any time during the draft’s lifetime as a working
>         group document. The purpose of the early review depends on the
>         stage that the document has reached. As this document is
>         currently in the WG Last call, my focus for the review was to
>         determine whether the document is ready to be published.
>         Please consider my comments along with the other working group
>         last call comments.
>
>         For more information about the Routing Directorate, please see
>         ​http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir
>
>         *Document*: draft-ietf-spring-segment-routing-mpls-13
>
>         *Reviewer*: Alexander (“Sasha”) Vainshtein
>         (alexander.vainshtein@ecitele.com
>         <mailto:alexander.vainshtein@ecitele.com>)
>
>         *Review Date*: 08-Jun-18
>
>         *Intended Status*: Proposed Standard.
>
>         *Summary*:
>
>         I have some minor concerns about this document that I think
>         should be resolved before it is submitted to the IESG.
>
>         *Comments*:
>
>         I consider this draft as an important  companion document to
>         the Segment Routing Architecture
>         <https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15>
>         draft that, ideally, should augment definitions of the Segment
>         Routing (SR) notions and constructs given there with details
>         specific for the SR instantiation that uses  the MPLS data
>         plane (SR-MPLS).  Many issues raised in my review reflect
>         either gaps that should be, but have not been, closed, or
>         inconsistencies between the two drafts.
>
>         Since RFC 8287 <https://tools.ietf.org/html/rfc8287> is
>         already published as a Standards Track RFC, I expect such
>         augmentation to be backward compatible with this document (or
>         to provide clear indications of required updates to this
>         document). And I include the MPLS WG into distribution list.
>
>         This draft was not easy reading for me. In particular, the
>         style of Section 2.5 that discusses at length and in some
>         detail multiple “corner cases” resulting, presumably, from
>         misconfiguration, before it explains the basic (and relatively
>         simple) “normal” behavior, looks problematic to me.
>
>         The WG Last Call has been extended by one week. Nevertheless,
>         I am sending out my comments
>
>         *Major Issues*: None found
>
>     #Ahmed: thanks a lot
>
>
>
>         *Minor Issues*: Quite a few but, hopefully, easy to resolve.
>
>         1.*Encapsulation of SR-MPLS packets*:
>
>         a.RFC 3032 (referenced by the draft) and RFC 5332 (*/not
>         mentioned in the draft/*) depend two encapsulations of labeled
>         packets - one for Downstream-allocated labels and another for
>         Upstream-allocated ones.
>
>     #Ahmed: RFC5332 is for multicast. As mentioned in Section 6 of
>     draft-ietf-spring-segment-routing-15, multicast is outside the
>     scope of SR. Hence the RFC was not referred to in the SR-MPLS draft
>
>     */[[Sasha]] I would be satisfied with this response, would it not
>     be for the following text I see in Section 2.2 of the/**/SR Policy
>     Architecture
>     <https://tools.ietf.org/html/draft-ietf-spring-segment-routing-policy-01>
>     /**/draft:/*
>
>        A variation of SR Policy can be used for packet replication.  A
>
>        candidate path could comprise multiple SID-Lists; one for each
>
>        replication path.  In such a scenario, packets are actually
>
>        replicated through each SID List of the SR Policy to realize a
>     point-
>
>        to-multipoint service delivery.
>
>     */This looks to me as being very much multicast in SR, and, unless
>     you want to say that it is limited to SRv6, makes my question
>     relevant IMHO./*
>
> ##Ahmed: The main reference for this draft is the sr-architecture, 
> which clearly states that multicast is out of SR scope. SR-MPLS, being 
> an MPLS instantiation of the SR-architecture, follows the 
> SR-architecture as close as possible. If another draft proposes 
> something related to SR, then it is the responsibility of the other 
> draft to mention any extensions/restrictions in relation to the basic 
> draft-ietf-spring-segment-routing and/or SR-MPLS, or to specifically 
> say that it does not apply to SR-MPLS.
>
>
>     b.From my POV the ST-MPLS only uses Downstream-allocated labels –
>     but I expect the draft to state that explicitly, one way or
>     another. (If Upstream-allocated labels are relevant for SR-MPLS, I
>     would see it as a major gap, so I hope that this is not the case).
>
> #Ahmed: I will add a statement in section 2.2 to mention that it is 
> down-stream allocated as you mentioned
>
> */[[Sasha]] This is quite unambiguous and, once added, would resolve 
> my comment in full – the previous comment notwithstanding. In 
> particular, it would imply that even labels representing BSIDs of a SR 
> Replication policies will be downstream-allocated. /*
>
> */#Ahmed: Binding SID is just a special case of a SID. So what applies 
> to a SID applies to a binding SID/*
>
>
>     2.*Label spaces in SR-MPLS*:
>
>     a.RFC 3031 (referenced by the draft) defines per-platform and
>     per-interface label spaces, and RFC 5331 (*/not mentioned in the
>     draft/*) adds context-specific label spaces and context labels.
>
>     b.The draft does not say which of these are or are not relevant
>     for SR-MPLS
>
>     c.From my POV:
>
>     i.Labels representing all kinds of SIDs mentioned in the draft
>     MUST be allocated from the per-platform label space only
>
>     ii.At the same time, instantiation of Mirror Segment IDs defined
>     in Section 5.1 of the Segment Routing Architecture draft using
>     MPLS data plane clearly calls for context labels and
>     context-specific label spaces
>
>     d.I expect the draft to provide a clear-cut position on these
>     aspects of SR-MPLS.
>
> #Ahmed: I will add a statement to section 2.2 to say that the it is 
> per-platform. Regarding the function "mirroring", SR attaches a 
> *function* to each SID. The "mirroring" function is already described 
> in Section 5.1 of draft-ietf-spring-segment-routing and is not 
> specific to the MPLS forwarding plane. Hence there is no need to 
> re-mention it here because this document is trying to be as specific 
> as possible to the MPLS forwarding plane. General functions attached 
> to SID are described in the segment routing architecture document or 
> future documents. Furture documents proposing new SR function must be 
> as specific and clear as possible
>
> */[[Sasha]] Looks OK to me./*
>
>
>
>
>
>     3.*SR-MPLS and hierarchical LSPs*:
>
>     a.SR LSPs that include more than one segment are hierarchical LSPs
>     from the POV of the MPLS data plane. Therefore some (possibly,
>     all) of the models for handling TTL and TC bits that have been
>     defined in RFC 3443 (*/not mentioned in the draft/*) should apply
>     to SR-MPLS
>
>     b.RFC 8287 (*/not referenced in the draft/*) specifically
>     discussed operation of the LSP Traceroute function for SR LSPs in
>     the case when Pipe/Short Pipe model for TTL handling is used
>
>     c.I expect the draft to provide at least some guidelines regarding
>     applicability of each specific model defined in RFC 3443
>     (separately for TTL and TC bits) to SR-MPLS.
>
> #Ahmed: BY design, the instantiation of SR over the MPLS forwarding 
> plane (and hence this draft) does not modify the MPLS forwarding plan 
> behavior as it is mentioned in the first sentence in Section 1. So the 
> TTL behavior specified in rfc3443 is already implied and there is no 
> need to re-mention it here just like all aspects of MPLS forwarding. 
> RFC8287 is OAM-specific.  SR-OAM is handled in a separate document so 
> is outside the scope of this draft
>
> */[[Sasha]] Unfortunately I do not think this is good enough. Let me 
> ask a specific question reflecting my concerns:/*
>
> */The head-end node sends SR-MPLS packets across a path defined by an 
> ordered set of SIDs with more than one SID in the list. Each SID is 
> represented by a label stack entry (LSE) in the MPLS label stack, and 
> the label field in each LSE is the label that matches the 
> corresponding SID. However, each LSE also includes the TTL and TC 
> fields. How does the head-end node set these fields in each of the 
> LSEs following the top one? This clearly depends on the model (Uniform 
> vs. Pipe/Short Pipe) implemented in each node that that performs Next 
> operation on the packet along the path – but the head-end node usually 
> is not aware of that. /*
>
> */RFC 8287 is relevant as an example here IMHO because it recommends 
> the following setting of TTL in Traceroute packets:/*
>
> -*/Set the TTL of all the labels above one that represents the segment 
> you are currently tracing to maximum/*
>
> -*/Set the TTL of the label one that represents the segment you are 
> currently tracing to the desired value (to be incremented until end of 
> segment is reached/*
>
> -*/Set the TTL of all the labels below one that represents the segment 
> you are currently tracing to 0./*
>
> */I expect the draft to provide some recommendations for traffic 
> (non-OAM) packets as well./*
>
> */##Ahmed: The setting of the TTL for non-OAM packets are subject to 
> the policy that constructed the label stack. SR-policy is handled in a 
> separate draft /*
>
>
>
>
>
>
>     4.*Inferring network layer protocol in SR-MPLS*:
>
>     a.I wonder if the draft could provide any details on the situation
>     when a label that represents some kind of SID is the
>     bottom-of-stack label to be popped by the egress LER
>
> #ahmed: This is part of the "Next" function. It is described in detail 
> in this document.
>
> */[[Sasha]] NEXT function is mentioned in several places in the 
> document. Can you please point to the specific text that is relevant 
> for my question?/*
>
> */##Ahmed: Part (a) here is a statement not a question. What is the 
> question?/*
>
>
>
>
>
>
>     b.For the reference, RFC 3032 says that “the identity of the
>     network layer protocol  must be inferable from the value of the
>     label which is popped from  the bottom of the stack, possibly
>     along with the contents  of the network layer header itself”
>
>     c.From my POV the following scenario indicates relevance of this
>     expectation for SR-MPLS:
>
>     i.IS-IS is used for distributing both IPv4 and IPv6 reachability
>     in a given domain
>
>     ii.An IS-IS adjacency over some dual-stack link is established,
>     and a single Adj-SID for this adjacency is advertised
>
>     iii.The node that has assigned and advertised this Adj-SID
>     receives a labeled packet with the label representing this Adj-SID
>     being both the top and bottom-of-stack label
>
>     iv.The implementers must be given unambiguous instructions for
>     forwarding the unlabeled packet via the dual-stack link as an Ipv4
>     or an IPv6 packet.
>
> #Ahmed: If you take a look at the SR-ISIS , SR-OSPFv2 and SR-OSFv3 
> drafts, you will see all 3 protocol advertise different adj-SIDS for 
> IPv4 next-hop and IPv6 next-hop. For example, ISIS uses the "F-Flag" 
> (section 2.2.1 in draft-ietf-isis-segment-routing-extensions-18) to 
> specify whether the adj-SID is for IPv4 and IPv6. Similarly, the 
> SR-ISIS draft attaches a prefix-SID to the prefix advertisement and 
> hence implies the identity of the protocol underneath the bottom most 
> label. For any other "function" attached to a SID, it is part of the 
> specification of this function to describe what happens when the SID 
> is represented by a label in the MPLS forwarding plane and this label 
> is the bottom most label
>
> */[[Sasha]] OK, got it. This issue is resolved./*
>
>
>
>
>
>     5.*Resolution**of Conflicts*: Are the
>
>     a.Are the conflict resolution procedures listed in section 2.5
>     mandatory to implement?
>
>     b.If they are mandatory to implement, are they also mandatory to
>     deploy, or can the operators simply treat any detected conflict as
>     requiring human intervention and preventing normal operation of
>     SR-MPLS?
>
> #Ahmed: They are recommended. I will modify the paragraph after the 
> first 3 bullets in Section 2.5 to say that it is recommeded.
>
>
>
> */[[Sasha]] OK. However, it would be nice if you could refer 
> separately for “RECOMMENDED to implement” and “RECOMMENDED to deploy”. 
>  The latter probably requires a configuration knob for enabling 
> conflict resolution rules (if they are implemented). /*
>
>     c.For the reference, the IETF capitalized MUST appears just in a
>     few places in Section 2.5, and each appearance has very narrow
>     context:
>
>     i.For MCCs where the "Topology" and/or "Algorithm" fields are not
>     defined, the numerical value of zero MUST be used for these two fields
>
>     ii.If the same set of FECs are attached to the same label "L1",
>     then the tie-breaking rules MUST always select the same FEC
>     irrespective of the order in which the FECs and the label "L1" are
>     received. In other words, the tie-breaking rule MUST be
>     deterministic.
>
>     iii.An implementation of explicit SID assignment MUST guarantee
>     collision freeness on the same router
>
>     From my POV, it is not possible to infer the answer to my question
>     from these statements. Some explicit statement is required.
>
> #Ahmed: I agree with you POV and as mentioned in my reply to items (a) 
> and (b), I will modify the paragraph to say that it is RECOMMENDED to 
> answer you questions in items (a) and (b)
>
>
>
>     d.The tie-breaking rules in section 2.5.1 include some specific
>     values for encoding FEC types and address families – but these
>     values are not supposed to appear in any IANA registries (because
>     the draft does not request any IANA actions). Can you please
>     clarify what is so special about these values?
>
> #Ahmed: There is no significance to the values but there is a 
> significance to the order among them. I will modify the text to 
> clarify that
>
> */[[Sasha]] OK. /*
>
>
>
>
>
>     e.I also doubt that comparison of FECs that represent IPv4 and
>     IPv6 prefix SIDs makes much sense (for conflict resolution or
>     else), because, among other things, there are valid scenarios when
>     an IPv4 /32 prefix is embedded in an IPv6 /128 one.
>
> #Ahmed: A prefix-SID is assigned to a prefix. An IPv6 prefix that 
> embeds an IPv4 prefix is different from the IPv4 prefix. The 
> specifications of SR extensions to ISIS, OSPFv2, OSPFv3, and BGP treat 
> IPv4 and IPv6 prefixes separately, including the IPV6 prefixes with 
> embedded IPv4 ones. Besides not all IPv6 prefixes embed IPv4 prefix in 
> them. Hence the distinction between IPv4 and IPv6 prefixes is quite clear
>
> */[[Sasha]] My concern was mainly about IPv4-mapped IPv6 addresses. 
> Quoting from RFC 4291:/*
>
>
>           *2.5.5.2*
>           <https://tools.ietf.org/html/rfc4291#section-2.5.5.2>*. 
>           IPv4-Mapped IPv6 Address*
>
>    A second type of IPv6 address that holds an embedded IPv4 address is
>
>    defined. This address type is used to represent the addresses of
>
> IPv4 nodes as IPv6 addresses.
>
> *//*
>
> */From my POV this means that a /128 prefix associated with an 
> IPv4-mapped IPv6 address and a /32 prefix associated with the IPv4 
> address that was mapped to this IPv6 address represent the same 
> entity. This understanding fully matches usage of IPv4-mapped IPv6 
> addresses as BGP Next Hops of VPN-IPv6 addresses defined in RFC 4798. 
> However, the comparison rules you have defined will treat them as two 
> different prefixes.  I wonder if these rules, in the case of a 
> conflict, could result in preferring the IPv6 prefix to an IPv4 one 
> and therefore loosing MPLS connectivity for the ingress PE of a 6VPE 
> service to its egress PE?/*
>
> */##Ahmed: The basic MPLS architecture does not forbid assigning 
> different labels to the same prefix, nonetheless to different prefixes 
> belonging to the same node or the same interface on the same node. One 
> of the fundamental concepts of SR-MPLS is that the same prefix-SID 
> must not be assigned to two different prefixes. So for the particular 
> scenario of embedding IPv4 in IPv6, the operator must assign different 
> SIDs to the IPv4 address and the IPv4-mapped IPv6 address that embeds 
> it, otherwise the label will be subject to the incoming label 
> collision resolution
>
>
>
> /*
>
>
>
>
>
>     f.Section 2.5.1 defines 3 types of SR-MPLS FECs, but I am not sure
>     all SID types defined in the Segment Routing Architecture draft
>     can be unambiguously mapped to one of these types. Problematic
>     examples include at least the following:
>
>     i.Parallel Adjacency SID
>
>     ii.Mirror SID
>
>     Explicit mapping of SID types to SR-MPLS FEC types would be most
>     useful IMO. If some SID types cannot be mapped to SR-MPLS FECs,
>     this must be explicitly stated in the draft.
>
> #Ahmed:
> Parallel adjacency SID are handled in the type "(next-hop, outgoing 
> interface)"
>
> */[[Sasha]] OK/*
>
>
> Mirror SID is a type of binding-SID as mentioned in Section 5.1 in the 
> SR architecture draft (draft-ietf-spring-segment-routing-15). Also as 
> described in Section 2.4 draft-ietf-isis-segment-routing-extensions-18 
> (also see the equivalent in the OSPFv2 and OSPFv3 draft), a binding 
> SID is identified by a prefix. Hence it is covered by the type 
> "(Prefix, Routing Instance, Topology, Algorithm)"
>
> */[[Sasha]] I respectfully disagree. There is definitely no mention of 
> Algorithm in the definition of the Mirror SID. /*
>
> */##Ahmed:
> The last paragraph in Section 2 of 
> draft-ietf-spring-segment-routing-14 says/*
>
>     We call "MPLS Control Plane Client (MCC)" any control plane entity
>     installing forwarding entries in the MPLS data plane.
>
> */The sentence starting at the 5th line of the first bullet of Section 
> 2.5 of draft-ietf-spring-segment-routing-14 says/*
>
> For MCCs where the "Topology" and/or "Algorithm"
>        fields are not defined, the numerical value of zero MUST be used
>        for these two fields.
>
> */If a binding-SID is downloaded to the forwarding plane, then it must 
> be associated with an MCC and hence it either has an "algorithm" or 
> the value zero is assumed for the "algorithm" field. If the 
> binding-SID is not downloaded to the forwarding plane, then it is 
> irrelevant to the entire draft not only to incoming label collision/*
>
>
>
>
>
>     6.*Node SIDs in SR-MPLS*:
>
>     a.Node SIDs are explicitly defined and discussed in the Segment
>     Routing Architecture draft but are not mentioned even once in this
>     draft
>
>     b.AFAIK, the common implementation practice today includes
>     assignment of at least one Node SID to every node in the SR-MPLS
>     domain
>
>     c.Is there a requirement to assign at least one Node SID per
>     {routing instance, topology, algorithm} in SR-MPLS? If not, can
>     the authors explain expected behavior of such a node? (See also my
>     comment about routing instances below).
>
> #Ahmed: A Node-SID is a special case of prefix-SID. So there nothing 
> specific about it from the MPLS forwarding plane point of view. 
> Similarly from a standard tracks draft point of view, there is no 
> requirement to assign a SID to every prefix just like there is no 
> requirement to bind every prefix to an LDP label. Common and/or 
> recommended practices or description of deployment scenarios are more 
> befitting to BCP or informational drafts. This draft is a standards 
> track draft
>
> */[[Sasha]] Well, you’ve just said that conflict resolution rules are 
> RECOMMENDED, and this is quite common in the Standards Track RFCs. /*
>
> */##Ahmed: OK., I think we are in agreement here:)/*
>
>
>
> If a {routing instance, topology, algorithm} is not assigned a SID, 
> then this FEC is totally irrelavant to this draft and hence describing 
> how a node treats it is totally outside the scope of this draft
>
> */[[Sasha]] AFAIK, neither of the SR extension drafts for IGPs mention 
> routing instances that can be associated with the prefix, so I think 
> that your reference to it is incorrect./*
>
> */What’s more I suspect that Node SIDs represent the most used special 
> case of Prefix SIDs with Anycast SIDs being quite behind.  Therefore 
> some recommendation pertaining to the usage of Node SIDs would be very 
> much in place IMHO. /*
>
> */##Ahmed: The  term "routing instance" within the context of incoming 
> label collision is defined in the first bullet in Section 2.5.
> As for any recommendation for useage of node-SID, anycast-SID,...,etc 
> , it is out of the scope of this draft because it is a matter of of 
> deployment/informational/BCP draft
>
>
> /*
>
>
>
>
>
>     7.*SRGB Size in SR-MPLS*:
>
>     a.The draft correctly treats the situation when an index assigned
>     to some global SID cannot be mapped to a label using the procedure
>     in Section 2.4 as a conflict.
>
>     b.At the same time the draft does not define any minimum size of
>     SRGB (be it defined as a single contiguous block or as a sequence
>     of such blocks) that MUST be implemented by all SR-capable nodes
>
>     c.I suspect that lack of such a definition could be detrimental to
>     interoperability of SR-MPLS solutions. AFAIK, the IETF has been
>     following, for quite some time, a policy that some reasonable
>     MUST-to-implement defaults should be assigned for all configurable
>     parameters exactly in order to prevent this.
>
> #Ahmed: This document specifies how the SRGB is used and the behavior 
> of routers when a prefix-SID index maps to a label inside and/or 
> outside the SRGB. The actual size of the SRGB is a task in 
> partitioning the label space, which is very specific to a particular 
> deployment scenario. So IMO it is outside the scope of a standards 
> track document. Now that SR-MPLS is deployed in many places, I expect 
> the community to gain sufficient experience to recommend (or not 
> recommend) a particular minimum/maximum size for the SRGB is some 
> future informational or BCP draft/RFC
>
> */[[Sasha]] My reading of your response is that minimum size of SRGB 
> is an issue for future study. Can you please just add this to the draft?/*
>
> */##Ahmed: OK. Added a sentence to the last paragraph of section 2.3/*
>
>
>
>
>
>
>     8.*Algorithms and Prefix SIDs*:
>
>     a.The draft mentions Algorithms (as part of SR-MPLS Prefix FEC)
>     in, but it does not explicitly link them with the Prefix-SID
>     algorithms defined in section 3.1.1 of the Segment Routing
>     Architecture draft
>
> #Ahmed: I will just add the reference 
> [I-D.ietf-spring-segment-routing]right beside the first time 
> "Algorithm" is mentioned
>
> */[[Sasha]] OK/*
>
>
>
>
>
>     b.From my POV, the draft should explicitly state that the default
>     Prefix-SID algorithm MUST be implemented in all SR-MPLS-compliant
>     routers.
>
> #Ahmed: The specification of what path calculation method should or 
> must be supported is a routing protocol property not a forwarding 
> plane property. In fact, the choice of a path calculation method or 
> algorithm is completely orthogonal to the routed protocol. Hence 
> mandating the support of a particular routing algorithm is beyond the 
> scope of this document.
>
> */[[Sasha]] OK/*
>
>
>
>
>
>     c.The Segment Routing Architecture draft states (in section 3.1.3)
>     that “Support of multiple algorithms applies to SRv6”. But neither
>     draft states whether multiple algorithms apply to SR-MPLS. Can you
>     please clarify this point?
>
> #Ahmed: The last paragraph of Section 3.1.2 titled SR-MPLS in 
> draft-ietf-spring-segment-routing-15 discusses the support of multiple 
> algorithms. So it is implied that the concept of algorithm applies to 
> SR-MPLS. Hence there is no need to re-mention it here
>
> */[[Sasha]] The paragraph to which you refer only says that if a 
> packet with the active Prefix-SID that is associated with a specific 
> algorithm is received by a node that does not support this algorithm, 
> this packet will be discarded. If this is the only type of support for 
> multiple algorithms SR provides, it is not very useful IMHO/**/. /*
>
> */##Ahmed: The SR-MPLS draft that we are discussing here does not 
> attempt to modify the SR-architecture draft. Any concerns related to 
> the SR-architecture should be addressed to the SR-architecture draft 
> not to this draft. /*
>
>
>
>
>
>     9.*Routing instances and the context for Prefix-SIDs*:
>
>     a.The Segment Routing Architecture draft states in Section 3.1
>     that the “context for an IGP-Prefix segment includes the prefix,
>     topology, and algorithm”
>
>     b.This draft seems to define (in section 2.5) the context for the
>     Prefix SID as “Prefix, Routing Instance, Topology, Algorithm”
>     where ”a routing instance is identified by a single incoming label
>     downloader to FIB” (but the notion of the label downloader to FIB
>     is not defined).
>
>     c.These two definitions look different to me.
>
>     d.At the very least I would expect alignment between the
>     definitions of context for the Prefix-SID between the two drafts.
>     Preferably, the definition given in the Segment Routing
>     Architecture draft should be used in both drafts.
>
> #Ahmed: The context of the section 2.5 is limited to the resolution of 
> local label collision. The use of "routing instance" in section 2.5 is 
> just there for tie-breaking if there is local label collision.
>
> */[[Sasha]] I have already mentioned that “routing instances” are not 
> defined in any the drafts dealing with SR Extensions for IGPs. So I do 
> not understand how the conflict resolution procedure is supposed to 
> use this. And in any case the difference between two definitions of 
> the context of Prefix-SID requires some explanation./*
>
> */##Ahmed: incoming label collision defines what is a routing instance 
> within its context. I do not understand what explanation you are 
> looking for/*
>
>
>
>
>
>
>
>     10.*Example of PUSH operation in Section 2.10.1*:
>
>     a.The first para of this section begins with the sentence “Suppose
>     an MCC on a router "R0" determines that PUSH or CONTINUE  
>     operation is to be applied to an incoming packet whose active SID
>     is the global SID "Si"”. In the context of SR-MPLS this means (to
>     me) that the incoming packet is a labeled packet and its top label
>     matches the global SID “Si”.
>
>     b.However, the example for PUSH operation in the next para of this
>     section is the case of an (unlabeled) IP packet with the
>     destination address covered by the IP prefix for which “Si” has
>     been assigned.
>
>     c.From my POV:
>
>     i.Mapping unlabeled packets to SIDs is indeed out of scope of the
>     draft. Therefore an example of a PUSH operation that is applied to
>     a labeled packet (with the active SID inferred from the top label
>     in the stack) is preferable.
>
>     ii.Valid examples of  PUSH operation applied to a labeled incoming
>     packet can be found in Sections 4.2 or 4.3 of the TI-LFA
>     <https://tools.ietf.org/html/draft-bashandy-rtgwg-segment-routing-ti-lfa-04>
>     draft
>
> #Ahmed: I do not understand your concern here:)
>
>
>
> */[[Sasha]] I think it is pretty clear: can you provide an example of 
> a PUSH operation applied to a labeled packet instead of your current 
> example?/*
>
> */##Ahmed: The example in the draft is included to clarify the concept 
> of a prefix SID attached to a prefix. As mentioned more than once, 
> SR-MPLS does not modify MPLS forwarding including pushing a label on a 
> labeled packet. It is something that has been done by routers and 
> switches for 20+ years. So including it here is redundant/*
>
>
>     *Nits*:
>
>     1.I concur with Adrian regarding numerous nits he has reported in
>     his WG LC Comment
>     <https://mailarchive.ietf.org/arch/msg/spring/FRhO2lgR8r4VlKP2ZN2dZwHU5BY>.
>     I would like to thank Adrian for an excellent review that have
>     saved me lots of hard work.
>
> #Ahmed: I also agree that Adrian's review is exceptional. I believe I 
> addressed all his comments in the latest version.
>
>
>
>     2.In addition, I’d like to report the following nits:
>
>     a.Ti-LFA in Section 2.11.1 should be TI-LFA (as in the TI-LFA
>     <https://tools.ietf.org/html/draft-bashandy-rtgwg-segment-routing-ti-lfa-04>
>     draft)
>
> #Ahmed: Already done in the latest version*/[[Sasha]] OK/*
>
>
>
>     b.TI-LFA draft is referenced in the text of Section 2.11.1, but
>     there is no matching reference in the “References” section
>     (probably, Informational)
>
> #Ahmed: Already done in the latest version*/[[Sasha]] OK/*
>
>
>
>     c.“zero Algorithm” in Section 2.5 (immediately above Section
>     2.5.1) must be replaced with “default algorithm”. Similarly,
>     “non-zero Algorithm” should be replaced with “non-default algorithm”
>
> #Ahmed: Will be done in the next version*/[[Sasha]] /* OK
>
>
>
>     3.I think that RFC 3443 and RFC 5332 should be listed as Normative
>     references in this draft while RFC 5331 and RFC 8277 should be
>     listed as Informative references. This would improve the
>     readability of the draft without any impact on its advancement.
>
> #Ahmed RFC5331 describes upstream label assignment. As you mentioned 
> above (and I will modify the draft to indicate that) SR-MPLS behavior 
> is similar to downstream label assignment. RFC 3443 describes TTL 
> behavior. This is an MPLS forwarding behavior. As mentioned in the 
> draft, SR-MPLS does not modify at the MPLS forwarding behavior
>
> */[[Sasha]] Regarding RFC 5331 – you may skip this reference if you 
> state (as discussed below) that SR-MPLS only allocates labels from the 
> per-platform label space. Regarding RFC 3443 – I do not think that you 
> can fully avoid discussion of Uniform and Pipe/Short Pipe models, and 
> therefore you will need this reference./*
>
> */##Ahmed: I did not add rfc5331 as a reference . Again pushing 
> multiple labels on top of a packet is a matter of SR-policy, which is 
> handled in a separate draft. /*
>
>
>
>
>
>
>
>     Hopefully, these comments will be useful.
>
> #Ahmed: They are certainly quite useful. Thanks a lot
>
>
>
>     Regards,
>
>     Sasha
>
>     Office: +972-39266302
>
>     Cell:      +972-549266302
>
>     Email: Alexander.Vainshtein@ecitele.com
>     <mailto:Alexander.Vainshtein@ecitele.com>
>
>
>     ___________________________________________________________________________
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    Sasha<br>
    <br>
    I uploaded version 15. But I was not sure how to best address your
    concern<br>
    <br>
    So Please propose the wording/modifications that looks reasonable to
    you and I will be more than happy to incorporate them<br>
    <div class="moz-cite-prefix"><br>
      Ahmed<br>
      <br>
      <br>
      On 7/25/18 12:20 AM, Alexander Vainshtein wrote:<br>
    </div>
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        <p class="MsoNormal" style="margin-left:0cm"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Stephane,<o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:0cm"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Lots
            of thanks for your email, and apologies for a long delayed
            response.<o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:0cm"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Regarding
            you reference to “</span><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D;background:yellow;mso-highlight:yellow">BGP
            3107 label over an LDP label over an RSVP label to build an
            end-to-end transport</span><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">”,
            I have looked up
            <a href="https://tools.ietf.org/html/rfc8277"
              moz-do-not-send="true">RFC 8277</a>  that has replaced RFC
            3107, and found there the following
            <b><i>explicit</i></b> statement:<o:p></o:p></span></p>
        <pre><span style="color:black">   When pushing labels onto a packet's label stack, the Time-to-Live<o:p></o:p></span></pre>
        <pre><span style="color:black">   (TTL) field ([<a href="https://tools.ietf.org/html/rfc3032" title="&quot;MPLS Label Stack Encoding&quot;" moz-do-not-send="true">RFC3032</a>], [<a href="https://tools.ietf.org/html/rfc3443" title="&quot;Time To Live (TTL) Processing in Multi-Protocol Label Switching (MPLS) Networks&quot;" moz-do-not-send="true">RFC3443</a>]) and the Traffic Class (TC) field<o:p></o:p></span></pre>
        <pre><span style="color:black">   ([<a href="https://tools.ietf.org/html/rfc3032" title="&quot;MPLS Label Stack Encoding&quot;" moz-do-not-send="true">RFC3032</a>], [<a href="https://tools.ietf.org/html/rfc5462" title="&quot;Multiprotocol Label Switching (MPLS) Label Stack Entry: &quot;" moz-do-not-send="true">RFC5462</a>]) of each label stack entry must, of course, be<o:p></o:p></span></pre>
        <pre><span style="color:black">   set.  This document does not specify any set of rules for setting<o:p></o:p></span></pre>
        <pre><span style="color:black">   these fields; that is a matter of local policy.</span><span style="color:black"><o:p></o:p></span></pre>
        <p class="MsoNormal" style="margin-left:0cm"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal" style="margin-left:0cm"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">No
            equivalent of this statement could be found in RFC 3107 –
            probably because RFC 3443 has not yet been published then.
            <o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:0cm"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">From
            my POV including the same (or equivalent) explicit statement
            in the draft would be sufficient to resolve the issue.<o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:0cm"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Hope
            this helps.<o:p></o:p></span></p>
        <div>
          <p class="MsoNormal"
            style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
            <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Regards,<o:p></o:p></span></p>
          <p class="MsoNormal"
            style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
            <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Sasha<o:p></o:p></span></p>
          <p class="MsoNormal"
            style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
            <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p> </o:p></span></p>
          <p class="MsoNormal"
            style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
            <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Office:
              +972-39266302<o:p></o:p></span></p>
          <p class="MsoNormal"
            style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
            <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Cell:     
              +972-549266302<o:p></o:p></span></p>
          <p class="MsoNormal"
            style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
            <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Email:  
              <a class="moz-txt-link-abbreviated" href="mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></span></p>
        </div>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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            <p class="MsoNormal"
              style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
              <b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">From:</span></b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">
                <a class="moz-txt-link-abbreviated" href="mailto:stephane.litkowski@orange.com">stephane.litkowski@orange.com</a>
                [<a class="moz-txt-link-freetext" href="mailto:stephane.litkowski@orange.com">mailto:stephane.litkowski@orange.com</a>]
                <br>
                <b>Sent:</b> Wednesday, July 18, 2018 2:27 PM<br>
                <b>To:</b> Ahmed Bashandy
                <a class="moz-txt-link-rfc2396E" href="mailto:abashandy.ietf@gmail.com">&lt;abashandy.ietf@gmail.com&gt;</a>; Alexander Vainshtein
                <a class="moz-txt-link-rfc2396E" href="mailto:Alexander.Vainshtein@ecitele.com">&lt;Alexander.Vainshtein@ecitele.com&gt;</a><br>
                <b>Cc:</b> <a class="moz-txt-link-abbreviated" href="mailto:rtg-dir@ietf.org">rtg-dir@ietf.org</a>; '<a class="moz-txt-link-abbreviated" href="mailto:mpls@ietf.org">mpls@ietf.org</a>'
                <a class="moz-txt-link-rfc2396E" href="mailto:mpls@ietf.org">&lt;mpls@ietf.org&gt;</a>; '<a class="moz-txt-link-abbreviated" href="mailto:adrian@olddog.co.uk">adrian@olddog.co.uk</a>'
                <a class="moz-txt-link-rfc2396E" href="mailto:adrian@olddog.co.uk">&lt;adrian@olddog.co.uk&gt;</a>; Jonathan Hardwick
                (<a class="moz-txt-link-abbreviated" href="mailto:Jonathan.Hardwick@metaswitch.com">Jonathan.Hardwick@metaswitch.com</a>)
                <a class="moz-txt-link-rfc2396E" href="mailto:jonathan.hardwick@metaswitch.com">&lt;jonathan.hardwick@metaswitch.com&gt;</a>;
                <a class="moz-txt-link-abbreviated" href="mailto:shraddha@juniper.net">shraddha@juniper.net</a>; <a class="moz-txt-link-abbreviated" href="mailto:spring@ietf.org">spring@ietf.org</a>;
                <a class="moz-txt-link-abbreviated" href="mailto:spring-chairs@ietf.org">spring-chairs@ietf.org</a>;
                <a class="moz-txt-link-abbreviated" href="mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org">draft-ietf-spring-segment-routing-mpls.authors@ietf.org</a><br>
                <b>Subject:</b> RE: RtgDir Early review:
                draft-ietf-spring-segment-routing-mpls-13<o:p></o:p></span></p>
          </div>
        </div>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Hi
            Sasha,</span><o:p></o:p></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">&gt;</span><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">
                The head-end node sends SR-MPLS packets across a path
                defined by an ordered set of SIDs with more than one SID
                in the list. Each SID is represented by a label stack
                entry (LSE) in the MPLS label stack, and the label field
                in each LSE is the label that matches the corresponding
                SID. However, each LSE also includes the TTL and TC
                fields. How does the head-end node set these fields in
                each of the LSEs following the top one? This clearly
                depends on the model (Uniform vs. Pipe/Short Pipe)
                implemented in each node that that performs Next
                operation on the packet along the path – but the
                head-end node usually is not aware of that. </span></i></b><o:p></o:p></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Why
            do you think this is different from a nested MPLS tunnel
            that exists today ? I completely agree with you that the
            head end does not know the behavior of the tail-end in term
            of TTL/TC processing. But that’s already the case today, and
            it’s the job of engineers to ensure that all nodes in the
            network are operating in the same mode (uniform vs
            pipe/short pipe).</span><o:p></o:p></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">We
            can already stack today a BGP 3107 label over an LDP label
            over an RSVP label to build an end-to-end transport, the TTL
            processing should not be essentially different.</span><o:p></o:p></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Could
            you pin point the difference that you see ?</span><o:p></o:p></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"> </span><o:p></o:p></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Brgds,</span><o:p></o:p></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"> </span><o:p></o:p></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Stephane</span><o:p></o:p></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"> </span><o:p></o:p></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"> </span><o:p></o:p></p>
        <div>
          <div style="border:none;border-top:solid #B5C4DF
            1.0pt;padding:3.0pt 0cm 0cm 0cm">
            <p class="MsoNormal"
              style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
              <b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:windowtext">From:</span></b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif;color:windowtext">
                Ahmed Bashandy [<a
                  href="mailto:abashandy.ietf@gmail.com"
                  moz-do-not-send="true">mailto:abashandy.ietf@gmail.com</a>]
                <br>
                <b>Sent:</b> Monday, July 16, 2018 22:03<br>
                <b>To:</b> Alexander Vainshtein<br>
                <b>Cc:</b> <a href="mailto:rtg-dir@ietf.org"
                  moz-do-not-send="true">rtg-dir@ietf.org</a>;
                '<a class="moz-txt-link-abbreviated" href="mailto:mpls@ietf.org">mpls@ietf.org</a>'; '<a class="moz-txt-link-abbreviated" href="mailto:adrian@olddog.co.uk">adrian@olddog.co.uk</a>'; Jonathan
                Hardwick (<a
                  href="mailto:Jonathan.Hardwick@metaswitch.com"
                  moz-do-not-send="true">Jonathan.Hardwick@metaswitch.com</a>);
                <a href="mailto:shraddha@juniper.net"
                  moz-do-not-send="true">shraddha@juniper.net</a>; <a
                  href="mailto:spring@ietf.org" moz-do-not-send="true">
                  spring@ietf.org</a>; <a
                  href="mailto:spring-chairs@ietf.org"
                  moz-do-not-send="true">spring-chairs@ietf.org</a>;
                <a
                  href="mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org"
                  moz-do-not-send="true">draft-ietf-spring-segment-routing-mpls.authors@ietf.org</a><br>
                <b>Subject:</b> Re: RtgDir Early review:
                draft-ietf-spring-segment-routing-mpls-13</span><o:p></o:p></p>
          </div>
        </div>
        <p class="MsoNormal"> <o:p></o:p></p>
        <p>Thanks a lot for the reply<o:p></o:p></p>
        <p>See inline "##Ahmed"<o:p></o:p></p>
        <p class="MsoNormal"> <o:p></o:p></p>
        <div>
          <p class="MsoNormal">On 7/11/18 2:02 AM, Alexander Vainshtein
            wrote:<o:p></o:p></p>
        </div>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <p class="MsoNormal" style="margin-left:0cm"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Ahmed,
              and all,</span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:0cm"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Lots
              of thanks for a detailed response to my comments.
            </span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:0cm"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Please
              see
            </span><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">inline
                  below</span></i></b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">
              my position on each of them.</span><o:p></o:p></p>
          <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"> </span><o:p></o:p></p>
          <div>
            <p class="MsoNormal"
              style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
              <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Regards,</span><o:p></o:p></p>
            <p class="MsoNormal"
              style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
              <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Sasha</span><o:p></o:p></p>
            <p class="MsoNormal"
              style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
              <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"> </span><o:p></o:p></p>
            <p class="MsoNormal"
              style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
              <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Office:
                +972-39266302</span><o:p></o:p></p>
            <p class="MsoNormal"
              style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
              <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Cell:     
                +972-549266302</span><o:p></o:p></p>
            <p class="MsoNormal"
              style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
              <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Email:  
                <a href="mailto:Alexander.Vainshtein@ecitele.com"
                  moz-do-not-send="true">Alexander.Vainshtein@ecitele.com</a></span><o:p></o:p></p>
          </div>
          <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"> </span><o:p></o:p></p>
          <div>
            <div style="border:none;border-top:solid #E1E1E1
              1.0pt;padding:3.0pt 0cm 0cm 0cm">
              <p class="MsoNormal"
                style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
                <b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">From:</span></b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">
                  Ahmed Bashandy [<a
                    href="mailto:abashandy.ietf@gmail.com"
                    moz-do-not-send="true">mailto:abashandy.ietf@gmail.com</a>]
                  <br>
                  <b>Sent:</b> Wednesday, July 11, 2018 4:42 AM<br>
                  <b>To:</b> Alexander Vainshtein <a
                    href="mailto:Alexander.Vainshtein@ecitele.com"
                    moz-do-not-send="true">
                    &lt;Alexander.Vainshtein@ecitele.com&gt;</a>; <a
                    href="mailto:spring-chairs@ietf.org"
                    moz-do-not-send="true">spring-chairs@ietf.org</a>;
                  <a
                    href="mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org"
                    moz-do-not-send="true">draft-ietf-spring-segment-routing-mpls.authors@ietf.org</a><br>
                  <b>Cc:</b> <a href="mailto:rtg-dir@ietf.org"
                    moz-do-not-send="true">rtg-dir@ietf.org</a>; '<a
                    href="mailto:mpls@ietf.org" moz-do-not-send="true">mpls@ietf.org</a>'
                  <a href="mailto:mpls@ietf.org" moz-do-not-send="true">&lt;mpls@ietf.org&gt;</a>;
                  '<a href="mailto:adrian@olddog.co.uk"
                    moz-do-not-send="true">adrian@olddog.co.uk</a>'
                  <a href="mailto:adrian@olddog.co.uk"
                    moz-do-not-send="true">&lt;adrian@olddog.co.uk&gt;</a>;
                  Jonathan Hardwick (<a
                    href="mailto:Jonathan.Hardwick@metaswitch.com"
                    moz-do-not-send="true">Jonathan.Hardwick@metaswitch.com</a>)
                  <a href="mailto:jonathan.hardwick@metaswitch.com"
                    moz-do-not-send="true">&lt;jonathan.hardwick@metaswitch.com&gt;</a>;
                  <a href="mailto:shraddha@juniper.net"
                    moz-do-not-send="true">shraddha@juniper.net</a>; <a
                    href="mailto:spring@ietf.org" moz-do-not-send="true">
                    spring@ietf.org</a><br>
                  <b>Subject:</b> Re: RtgDir Early review:
                  draft-ietf-spring-segment-routing-mpls-13</span><o:p></o:p></p>
            </div>
          </div>
          <p class="MsoNormal"> <o:p></o:p></p>
          <p>Thanks for thorough (and VERY clear) the review<o:p></o:p></p>
          <p>See inline #Ahmed<o:p></o:p></p>
          <p> <o:p></o:p></p>
          <p>Ahmed<o:p></o:p></p>
          <p> <o:p></o:p></p>
          <p class="MsoNormal"> <o:p></o:p></p>
          <div>
            <p class="MsoNormal">On 6/15/18 11:08 PM, Alexander
              Vainshtein wrote:<o:p></o:p></p>
          </div>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <p class="MsoNormal"><span
                  style="font-family:&quot;Arial&quot;,sans-serif">Re-sending
                  to  correct SPRING WG list.</span><o:p></o:p></p>
            </div>
            <div>
              <p class="MsoNormal"><span
                  style="font-family:&quot;Arial&quot;,sans-serif">Sincere
                  apologies for the delay caused by a typo.</span><o:p></o:p></p>
            </div>
            <div>
              <div>
                <p class="MsoNormal"
                  style="margin-bottom:0inmargin-bottom:.0001pt"><span
                    style="font-family:&quot;Arial&quot;,sans-serif">Thumb
                    typed by Sasha Vainshtein</span><o:p></o:p></p>
              </div>
              <p class="MsoNormal"><span
                  style="font-family:&quot;Arial&quot;,sans-serif"> </span><o:p></o:p></p>
            </div>
            <div style="margin-left:21.6pt;margin-bottom:12.0pt">
              <div class="MsoNormal"
                style="margin:0cm;margin-bottom:.0001pt;text-align:center"
                align="center">
                <span style="font-family:&quot;Times New Roman
                  \,serif&quot;">
                  <hr align="center" size="2" width="98%">
                </span></div>
            </div>
            <div id="divRplyFwdMsg">
              <p class="MsoNormal"><b>From:</b> Alexander Vainshtein<br>
                <b>Sent:</b> Sunday, June 10, 2018 10:43:52 AM<br>
                <b>To:</b> <a href="mailto:spring-chairs@ietf.org"
                  moz-do-not-send="true">spring-chairs@ietf.org</a>; <a
href="mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org"
                  moz-do-not-send="true">
draft-ietf-spring-segment-routing-mpls.authors@ietf.org</a><br>
                <b>Cc:</b> <a href="mailto:spring@ietf.com"
                  moz-do-not-send="true">spring@ietf.com</a>; <a
                  href="mailto:rtg-dir@ietf.org" moz-do-not-send="true">
                  rtg-dir@ietf.org</a>; '<a href="mailto:mpls@ietf.org"
                  moz-do-not-send="true">mpls@ietf.org</a>'; '<a
                  href="mailto:adrian@olddog.co.uk"
                  moz-do-not-send="true">adrian@olddog.co.uk</a>';
                Jonathan Hardwick (<a
                  href="mailto:Jonathan.Hardwick@metaswitch.com"
                  moz-do-not-send="true">Jonathan.Hardwick@metaswitch.com</a>);
                <a href="mailto:shraddha@juniper.net"
                  moz-do-not-send="true">shraddha@juniper.net</a><br>
                <b>Subject:</b> RE: RtgDir Early review:
                draft-ietf-spring-segment-routing-mpls-13<span
                  style="font-family:&quot;Times New Roman&quot;,serif">
                </span><o:p></o:p></p>
              <div>
                <p class="MsoNormal"><span
                    style="font-family:&quot;Times New Roman
                    \,serif&quot;"> </span><o:p></o:p></p>
              </div>
            </div>
            <div>
              <div>
                <p class="MsoNormal"><span style="color:#1F497D">Explicitly
                    adding Shraddha  who is the shepherd of this draft.
                  </span><o:p></o:p></p>
                <p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
                <div>
                  <p class="MsoNormal"><span style="color:#1F497D">Regards,</span><o:p></o:p></p>
                  <p class="MsoNormal"><span style="color:#1F497D">Sasha</span><o:p></o:p></p>
                  <p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
                  <p class="MsoNormal"><span style="color:#1F497D">Office:
                      +972-39266302</span><o:p></o:p></p>
                  <p class="MsoNormal"><span style="color:#1F497D">Cell:     
                      +972-549266302</span><o:p></o:p></p>
                  <p class="MsoNormal"><span style="color:#1F497D">Email:  
                      <a href="mailto:Alexander.Vainshtein@ecitele.com"
                        moz-do-not-send="true">
                        Alexander.Vainshtein@ecitele.com</a></span><o:p></o:p></p>
                </div>
                <p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
                <div>
                  <div style="border:none;border-top:solid #E1E1E1
                    1.0pt;padding:3.0pt 0cm 0cm 0cm">
                    <p class="MsoNormal"><b>From:</b> Alexander
                      Vainshtein <br>
                      <b>Sent:</b> Friday, June 8, 2018 5:43 PM<br>
                      <b>To:</b> '<a
                        href="mailto:spring-chairs@ietf.org"
                        moz-do-not-send="true">spring-chairs@ietf.org</a>'
                      <a href="mailto:spring-chairs@ietf.org"
                        moz-do-not-send="true">
                        &lt;spring-chairs@ietf.org&gt;</a>; '<a
                        href="mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org"
                        moz-do-not-send="true">draft-ietf-spring-segment-routing-mpls.authors@ietf.org</a>'
                      <a
                        href="mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org"
                        moz-do-not-send="true">&lt;draft-ietf-spring-segment-routing-mpls.authors@ietf.org&gt;</a><br>
                      <b>Cc:</b> '<a href="mailto:spring@ietf.com"
                        moz-do-not-send="true">spring@ietf.com</a>' <a
                        href="mailto:spring@ietf.com"
                        moz-do-not-send="true">
                        &lt;spring@ietf.com&gt;</a>; <a
                        href="mailto:rtg-dir@ietf.org"
                        moz-do-not-send="true">rtg-dir@ietf.org</a>; <a
                        href="mailto:mpls@ietf.org"
                        moz-do-not-send="true">
                        mpls@ietf.org</a>; '<a
                        href="mailto:adrian@olddog.co.uk"
                        moz-do-not-send="true">adrian@olddog.co.uk</a>'
                      <a href="mailto:adrian@olddog.co.uk"
                        moz-do-not-send="true">&lt;adrian@olddog.co.uk&gt;</a><br>
                      <b>Subject:</b> RtgDir Early review:
                      draft-ietf-spring-segment-routing-mpls-13<o:p></o:p></p>
                  </div>
                </div>
                <p class="MsoNormal"> <o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Hello,</span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">I
                    have been selected to do a routing directorate
                    “early” review of this draft:
                    <a
href="https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/"
                      moz-do-not-send="true">
https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/</a></span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">The
                    routing directorate will, on request from the
                    working group chair, perform an “early” review of a
                    draft before it is submitted for publication to the
                    IESG. The early review can be performed at any time
                    during the draft’s lifetime as a working group
                    document. The purpose of the early review depends on
                    the stage that the document has reached. As this
                    document is currently in the WG Last call, my focus
                    for the review was to determine whether the document
                    is ready to be published. Please consider my
                    comments along with the other working group last
                    call comments.</span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">For
                    more information about the Routing Directorate,
                    please see
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Arial&quot;,sans-serif">​</span><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"><a
                      href="http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir"
                      moz-do-not-send="true">http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir</a>
                  </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><b><span
                      style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Document</span></b><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:
                    draft-ietf-spring-segment-routing-mpls-13</span><o:p></o:p></p>
                <p class="MsoNormal"><b><span
                      style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Reviewer</span></b><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:
                    Alexander (“Sasha”) Vainshtein (<a
                      href="mailto:alexander.vainshtein@ecitele.com"
                      moz-do-not-send="true">alexander.vainshtein@ecitele.com</a>)</span><o:p></o:p></p>
                <p class="MsoNormal"><b><span
                      style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Review
                      Date</span></b><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:
                    08-Jun-18</span><o:p></o:p></p>
                <p class="MsoNormal"><b><span
                      style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Intended
                      Status</span></b><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:
                    Proposed Standard.</span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><b><span
                      style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Summary</span></b><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:</span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">I
                    have some minor concerns about this document that I
                    think should be resolved before it is submitted to
                    the IESG.</span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><b><span
                      style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Comments</span></b><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:</span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">I
                    consider this draft as an important  companion
                    document to the
                    <a
                      href="https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15"
                      moz-do-not-send="true">Segment Routing
                      Architecture</a> draft that, ideally, should
                    augment definitions of the Segment Routing (SR)
                    notions and constructs given there with details
                    specific for the SR instantiation that uses  the
                    MPLS data plane (SR-MPLS).  Many issues raised in my
                    review reflect either gaps that should be, but have
                    not been, closed, or inconsistencies between the two
                    drafts.
                  </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Since
                    <a href="https://tools.ietf.org/html/rfc8287"
                      moz-do-not-send="true">RFC 8287</a> is already
                    published as a Standards Track RFC, I expect such
                    augmentation to be backward compatible with this
                    document (or to provide clear indications of
                    required updates to this document). And I include
                    the MPLS WG into distribution list. </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">This
                    draft was not easy reading for me. In particular,
                    the style of Section 2.5 that discusses at length
                    and in some detail multiple “corner cases”
                    resulting, presumably, from misconfiguration, before
                    it explains the basic (and relatively simple)
                    “normal” behavior, looks problematic to me.</span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">The
                    WG Last Call has been extended by one week.
                    Nevertheless, I am sending out my comments
                  </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><b><span
                      style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Major
                      Issues</span></b><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:
                    None found</span><o:p></o:p></p>
              </div>
            </div>
          </blockquote>
          <p class="MsoNormal"><span style="font-family:&quot;Times New
              Roman \,serif&quot;">#Ahmed: thanks a lot<br>
              <br>
              <br>
              <br>
            </span><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <div>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><b><span
                      style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Minor
                      Issues</span></b><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:
                    Quite a few but, hopefully, easy to resolve.</span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoListParagraph" style="text-indent:-18.0pt"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">1.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><b><span
                      style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Encapsulation
                      of SR-MPLS packets</span></b><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:
                  </span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:72.0pt;text-indent:-18.0pt"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">a.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">RFC
                    3032 (referenced by the draft) and RFC 5332 (<b><i>not
                        mentioned in the draft</i></b>) depend two
                    encapsulations of labeled packets - one for
                    Downstream-allocated labels and another for
                    Upstream-allocated ones.</span><o:p></o:p></p>
              </div>
            </div>
          </blockquote>
          <p class="MsoNormal"><span style="font-family:&quot;Times New
              Roman \,serif&quot;">#Ahmed: RFC5332 is for multicast. As
              mentioned in Section 6 of
              draft-ietf-spring-segment-routing-15, multicast is outside
              the scope of SR. Hence the RFC was not referred to in the
              SR-MPLS draft</span><o:p></o:p></p>
          <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                  I would be satisfied with this response, would it not
                  be for the following text I see in Section 2.2 of the</span></i></b><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">
                  <a
href="https://tools.ietf.org/html/draft-ietf-spring-segment-routing-policy-01"
                    moz-do-not-send="true">
                    SR Policy Architecture</a> </span></i></b><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">draft:</span></i></b><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
            <span style="font-size:10.0pt">   A variation of SR Policy
              can be used for packet replication.  A</span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
            <span style="font-size:10.0pt">   candidate path could
              comprise multiple SID-Lists; one for each</span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
            <span style="font-size:10.0pt">   replication path.  In such
              a scenario, packets are actually</span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
            <span style="font-size:10.0pt">   replicated through each
              SID List of the SR Policy to realize a point-</span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
            <span style="font-size:10.0pt">   to-multipoint service
              delivery. </span><o:p></o:p></p>
          <p class="MsoNormal"> <o:p></o:p></p>
          <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">This
                  looks to me as being very much multicast in SR, and,
                  unless you want to say that it is limited to SRv6,
                  makes my question relevant IMHO.</span></i></b><o:p></o:p></p>
        </blockquote>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif">##Ahmed:
            The main reference for this draft is the sr-architecture,
            which clearly states that multicast is out of SR scope.
            SR-MPLS, being an MPLS instantiation of the SR-architecture,
            follows the SR-architecture as close as possible. If another
            draft proposes something related to SR, then it is the
            responsibility of the other draft to mention any
            extensions/restrictions in relation to the basic
            draft-ietf-spring-segment-routing and/or SR-MPLS, or to
            specifically say that it does not apply to SR-MPLS.<br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <div>
              <p class="MsoListParagraph"
                style="margin-left:72.0pt;text-indent:-18.0pt"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">b.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">From
                  my POV the ST-MPLS only uses Downstream-allocated
                  labels – but I expect the draft to state that
                  explicitly, one way or another. (If Upstream-allocated
                  labels are relevant for SR-MPLS, I would see it as a
                  major gap, so I hope that this is not the case).</span><o:p></o:p></p>
            </div>
          </div>
        </blockquote>
        <p class="MsoNormal"><span style="font-family:&quot;Times New
            Roman \,serif&quot;">#Ahmed: I will add a statement in
            section 2.2 to mention that it is down-stream allocated as
            you mentioned</span><o:p></o:p></p>
        <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">[[Sasha]]
                This is quite unambiguous and, once added, would resolve
                my comment in full – the previous comment
                notwithstanding. In particular, it would imply that even
                labels representing BSIDs of a SR Replication policies
                will be downstream-allocated.
              </span></i></b><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span style="font-family:&quot;Times New
                Roman&quot;,serif">#Ahmed: Binding SID is just a special
                case of a SID. So what applies to a SID applies to a
                binding SID</span></i></b><span
            style="font-family:&quot;Times New Roman&quot;,serif"><br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <p class="MsoNormal"><span style="font-family:&quot;Times New
            Roman \,serif&quot;"> </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <div>
              <p class="MsoListParagraph" style="text-indent:-18.0pt"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">2.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><b><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Label
                    spaces in SR-MPLS</span></b><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:72.0pt;text-indent:-18.0pt"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">a.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">RFC
                  3031 (referenced by the draft) defines per-platform
                  and per-interface label spaces, and RFC 5331 (<b><i>not
                      mentioned in the draft</i></b>) adds
                  context-specific label spaces and context labels. </span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:72.0pt;text-indent:-18.0pt"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">b.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">The
                  draft does not say which of these are or are not
                  relevant for SR-MPLS</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:72.0pt;text-indent:-18.0pt"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">c.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">From
                  my POV:</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:108.0pt;text-indent:-108.0pt"><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">                                        
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">i.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Labels
                  representing all kinds of SIDs mentioned in the draft
                  MUST be allocated from the per-platform label space
                  only
                </span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:108.0pt;text-indent:-108.0pt"><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">                                       
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">ii.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">At
                  the same time, instantiation of Mirror Segment IDs
                  defined in Section 5.1 of the Segment Routing
                  Architecture draft using MPLS data plane clearly calls
                  for context labels and context-specific label spaces</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:72.0pt;text-indent:-18.0pt"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">d.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">I
                  expect the draft to provide a clear-cut position on
                  these aspects of SR-MPLS.</span><o:p></o:p></p>
            </div>
          </div>
        </blockquote>
        <p class="MsoNormal"><span style="font-family:&quot;Times New
            Roman \,serif&quot;">#Ahmed: I will add a statement to
            section 2.2 to say that the it is per-platform. Regarding
            the function "mirroring", SR attaches a *function* to each
            SID. The "mirroring" function is already described in
            Section 5.1 of draft-ietf-spring-segment-routing and is not
            specific to the MPLS forwarding plane. Hence there is no
            need to re-mention it here because this document is trying
            to be as specific as possible to the MPLS forwarding plane.
            General functions attached to SID are described in the
            segment routing architecture document or future documents.
            Furture documents proposing new SR function must be as
            specific and clear as possible</span><o:p></o:p></p>
        <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                Looks OK to me.</span></i></b><o:p></o:p></p>
        <p class="MsoNormal"><span style="font-family:&quot;Times New
            Roman \,serif&quot;"><br>
            <br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <div>
              <p class="MsoListParagraph" style="text-indent:-18.0pt"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">3.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><b><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">SR-MPLS
                    and hierarchical LSPs</span></b><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:72.0pt;text-indent:-18.0pt"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">a.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">SR
                  LSPs that include more than one segment are
                  hierarchical LSPs from the POV of the MPLS data plane.
                  Therefore some (possibly, all) of the models for
                  handling TTL and TC bits that have been defined in RFC
                  3443 (<b><i>not mentioned in the draft</i></b>) should
                  apply to SR-MPLS</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:72.0pt;text-indent:-18.0pt"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">b.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">RFC
                  8287 (<b><i>not referenced in the draft</i></b>)
                  specifically discussed operation of the LSP Traceroute
                  function for SR LSPs in the case when Pipe/Short Pipe
                  model for TTL handling is used</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:72.0pt;text-indent:-18.0pt"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">c.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">I
                  expect the draft to provide at least some guidelines
                  regarding applicability of each specific model defined
                  in RFC 3443 (separately for TTL and TC bits) to
                  SR-MPLS.</span><o:p></o:p></p>
            </div>
          </div>
        </blockquote>
        <p class="MsoNormal"><span style="font-family:&quot;Times New
            Roman \,serif&quot;">#Ahmed: BY design, the instantiation of
            SR over the MPLS forwarding plane (and hence this draft)
            does not modify the MPLS forwarding plan behavior as it is
            mentioned in the first sentence in Section 1. So the TTL
            behavior specified in rfc3443 is already implied and there
            is no need to re-mention it here just like all aspects of
            MPLS forwarding. RFC8287 is OAM-specific.  SR-OAM is handled
            in a separate document so is outside the scope of this draft</span><o:p></o:p></p>
        <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                Unfortunately I do not think this is good enough. Let me
                ask a specific question reflecting my concerns:</span></i></b><o:p></o:p></p>
        <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">The
                head-end node sends SR-MPLS packets across a path
                defined by an ordered set of SIDs with more than one SID
                in the list. Each SID is represented by a label stack
                entry (LSE) in the MPLS label stack, and the label field
                in each LSE is the label that matches the corresponding
                SID. However, each LSE also includes the TTL and TC
                fields. How does the head-end node set these fields in
                each of the LSEs following the top one? This clearly
                depends on the model (Uniform vs. Pipe/Short Pipe)
                implemented in each node that that performs Next
                operation on the packet along the path – but the
                head-end node usually is not aware of that.
              </span></i></b><o:p></o:p></p>
        <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">RFC
                8287 is relevant as an example here IMHO because it
                recommends the following setting of TTL in Traceroute
                packets:</span></i></b><o:p></o:p></p>
        <p class="MsoListParagraph"
          style="margin-left:39.6pt;text-indent:-18.0pt"><span
            style="color:#00B050">-</span><span
            style="font-size:7.0pt;font-family:&quot;Times New
            Roman&quot;,serif;color:#00B050">         
          </span><b><i><span style="color:#00B050">Set the TTL of all
                the labels above one that represents the segment you are
                currently tracing to maximum</span></i></b><o:p></o:p></p>
        <p class="MsoListParagraph"
          style="margin-left:39.6pt;text-indent:-18.0pt"><span
            style="color:#00B050">-</span><span
            style="font-size:7.0pt;font-family:&quot;Times New
            Roman&quot;,serif;color:#00B050">         
          </span><b><i><span style="color:#00B050">Set the TTL of the
                label one that represents the segment you are currently
                tracing to the desired value (to be incremented until
                end of segment is reached</span></i></b><o:p></o:p></p>
        <p class="MsoListParagraph"
          style="margin-left:39.6pt;text-indent:-18.0pt"><span
            style="color:#00B050">-</span><span
            style="font-size:7.0pt;font-family:&quot;Times New
            Roman&quot;,serif;color:#00B050">         
          </span><b><i><span style="color:#00B050">Set the TTL of all
                the labels below one that represents the segment you are
                currently tracing to 0.</span></i></b><o:p></o:p></p>
        <p class="MsoNormal"><b><i><span
                style="font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">I
                expect the draft to provide some recommendations for
                traffic (non-OAM) packets as well.</span></i></b><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span style="font-family:&quot;Times New
                Roman&quot;,serif">##Ahmed: The setting of the TTL for
                non-OAM packets are subject to the policy that
                constructed the label stack. SR-policy is handled in a
                separate draft 
              </span></i></b><span style="font-family:&quot;Times New
            Roman&quot;,serif"><br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <p class="MsoNormal"><span style="font-family:&quot;Times New
            Roman \,serif&quot;"><br>
            <br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <div>
              <p class="MsoListParagraph" style="text-indent:-18.0pt"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">4.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><b><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Inferring
                    network layer protocol in SR-MPLS</span></b><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:72.0pt;text-indent:-18.0pt"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">a.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">I
                  wonder if the draft could provide any details on the
                  situation when a label that represents some kind of
                  SID is the bottom-of-stack label to be popped by the
                  egress LER</span><o:p></o:p></p>
            </div>
          </div>
        </blockquote>
        <p class="MsoNormal"><span style="font-family:&quot;Times New
            Roman \,serif&quot;">#ahmed: This is part of the "Next"
            function. It is described in detail in this document.
          </span><o:p></o:p></p>
        <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                NEXT function is mentioned in several places in the
                document. Can you please point to the specific text that
                is relevant for my question?</span></i></b><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span style="font-family:&quot;Times New
                Roman&quot;,serif">##Ahmed: Part (a) here is a statement
                not a question. What is the question?</span></i></b><span
            style="font-family:&quot;Times New Roman&quot;,serif"><br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <p class="MsoNormal"><span style="font-family:&quot;Times New
            Roman \,serif&quot;"><br>
            <br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <div>
              <p class="MsoListParagraph"
                style="margin-left:72.0pt;text-indent:-18.0pt"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">b.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">For
                  the reference, RFC 3032 says that “the identity of the
                  network layer protocol  must be inferable from the
                  value of the label which is popped from  the bottom of
                  the stack, possibly along with the contents  of the
                  network layer header itself”</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:72.0pt;text-indent:-18.0pt"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">c.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">From
                  my POV the following scenario indicates relevance of
                  this expectation for SR-MPLS:</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:108.0pt;text-indent:-108.0pt"><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">                                        
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">i.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">IS-IS
                  is used for distributing both IPv4 and IPv6
                  reachability in a given domain</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:108.0pt;text-indent:-108.0pt"><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">                                       
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">ii.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">An
                  IS-IS adjacency over some dual-stack link is
                  established, and a single Adj-SID for this adjacency
                  is advertised</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:108.0pt;text-indent:-108.0pt"><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">                                      
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">iii.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">The
                  node that has assigned and advertised this Adj-SID
                  receives a labeled packet with the label representing
                  this Adj-SID being both the top and bottom-of-stack
                  label</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:108.0pt;text-indent:-108.0pt"><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">                                      
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">iv.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">The
                  implementers must be given unambiguous instructions
                  for forwarding the unlabeled packet via the dual-stack
                  link as an Ipv4 or an IPv6 packet.</span><o:p></o:p></p>
            </div>
          </div>
        </blockquote>
        <p class="MsoNormal"><span style="font-family:&quot;Times New
            Roman \,serif&quot;">#Ahmed: If you take a look at the
            SR-ISIS , SR-OSPFv2 and SR-OSFv3 drafts, you will see all 3
            protocol advertise different adj-SIDS for IPv4 next-hop and
            IPv6 next-hop. For example, ISIS uses the "F-Flag" (section
            2.2.1 in draft-ietf-isis-segment-routing-extensions-18) to
            specify whether the adj-SID is for IPv4 and IPv6. Similarly,
            the SR-ISIS draft attaches a prefix-SID to the prefix
            advertisement and hence implies the identity of the protocol
            underneath the bottom most label. For any other "function"
            attached to a SID, it is part of the specification of this
            function to describe what happens when the SID is
            represented by a label in the MPLS forwarding plane and this
            label is the bottom most label
          </span><o:p></o:p></p>
        <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                OK, got it. This issue is resolved.</span></i></b><o:p></o:p></p>
        <p class="MsoNormal"><span style="font-family:&quot;Times New
            Roman \,serif&quot;"><br>
            <br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <div>
              <p class="MsoListParagraph" style="text-indent:-18.0pt"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">5.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><b><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Resolution</span></b><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">
                  <b>of Conflicts</b>: Are the</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:72.0pt;text-indent:-18.0pt"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">a.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Are
                  the conflict resolution procedures listed in section
                  2.5 mandatory to implement?
                </span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:72.0pt;text-indent:-18.0pt"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">b.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">If
                  they are mandatory to implement, are they also
                  mandatory to deploy, or can the operators simply treat
                  any detected conflict as requiring human intervention
                  and preventing normal operation of SR-MPLS?</span><o:p></o:p></p>
            </div>
          </div>
        </blockquote>
        <p class="MsoNormal"><span style="font-family:&quot;Times New
            Roman \,serif&quot;">#Ahmed: They are recommended. I will
            modify the paragraph after the first 3 bullets in Section
            2.5 to say that it is recommeded.  
            <br>
            <br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                OK. However, it would be nice if you could refer
                separately for “RECOMMENDED to implement” and
                “RECOMMENDED to deploy”.  The latter probably requires a
                configuration knob for enabling conflict resolution
                rules (if they are implemented).
              </span></i></b><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <div>
              <p class="MsoListParagraph"
                style="margin-left:72.0pt;text-indent:-18.0pt"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">c.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">For
                  the reference, the IETF capitalized MUST appears just
                  in a few places in Section 2.5, and each appearance
                  has very narrow context:</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:108.0pt;text-indent:-108.0pt"><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">                                        
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">i.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">For
                  MCCs where the "Topology" and/or "Algorithm" fields
                  are not defined, the numerical value of zero MUST be
                  used for these two fields</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:108.0pt;text-indent:-108.0pt"><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">                                       
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">ii.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">If
                  the same set of FECs are attached to the same label
                  "L1", then the tie-breaking rules MUST always select
                  the same FEC irrespective of the order in which the
                  FECs and the label "L1" are received. In other words,
                  the tie-breaking rule MUST be deterministic. </span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:108.0pt;text-indent:-108.0pt"><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">                                      
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">iii.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">An
                  implementation of explicit SID assignment MUST
                  guarantee collision freeness on the same router</span><o:p></o:p></p>
              <p class="MsoNormal" style="margin-left:72.0pt"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">From
                  my POV, it is not possible to infer the answer to my
                  question from these statements. Some explicit
                  statement is required.</span><o:p></o:p></p>
            </div>
          </div>
        </blockquote>
        <p class="MsoNormal"><span style="font-family:&quot;Times New
            Roman \,serif&quot;">#Ahmed: I agree with you POV and as
            mentioned in my reply to items (a) and (b), I will modify
            the paragraph to say that it is RECOMMENDED to answer you
            questions in items (a) and (b)<br>
            <br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <div>
              <p class="MsoListParagraph"
                style="margin-left:72.0pt;text-indent:-18.0pt"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">d.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">The
                  tie-breaking rules in section 2.5.1 include some
                  specific values for encoding FEC types and address
                  families – but these values are not supposed to appear
                  in any IANA registries (because the draft does not
                  request any IANA actions). Can you please clarify what
                  is so special about these values?
                </span><o:p></o:p></p>
            </div>
          </div>
        </blockquote>
        <p class="MsoNormal"><span style="font-family:&quot;Times New
            Roman \,serif&quot;">#Ahmed: There is no significance to the
            values but there is a significance to the order among them.
            I will modify the text to clarify that</span><o:p></o:p></p>
        <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                OK.
              </span></i></b><o:p></o:p></p>
        <p class="MsoNormal"><span style="font-family:&quot;Times New
            Roman \,serif&quot;"><br>
            <br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <div>
              <p class="MsoListParagraph"
                style="margin-left:72.0pt;text-indent:-18.0pt"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">e.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">I
                  also doubt that comparison of FECs that represent IPv4
                  and IPv6 prefix SIDs makes much sense (for conflict
                  resolution or else), because, among other things,
                  there are valid scenarios when an IPv4 /32 prefix is
                  embedded in an IPv6 /128 one.</span><o:p></o:p></p>
            </div>
          </div>
        </blockquote>
        <p class="MsoNormal"><span style="font-family:&quot;Times New
            Roman \,serif&quot;">#Ahmed: A prefix-SID is assigned to a
            prefix. An IPv6 prefix that embeds an IPv4 prefix is
            different from the IPv4 prefix. The specifications of SR
            extensions to ISIS, OSPFv2, OSPFv3, and BGP treat IPv4 and
            IPv6 prefixes separately, including the IPV6 prefixes with
            embedded IPv4 ones. Besides not all IPv6 prefixes embed IPv4
            prefix in them. Hence the distinction between IPv4 and IPv6
            prefixes is quite clear
          </span><o:p></o:p></p>
        <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                My concern was mainly about IPv4-mapped IPv6 addresses.
                Quoting from RFC 4291:</span></i></b><o:p></o:p></p>
        <h5 style="mso-line-height-alt:0pt"><a
            href="https://tools.ietf.org/html/rfc4291#section-2.5.5.2"
            moz-do-not-send="true"><b><span
                style="font-size:10.0pt;font-family:&quot;Courier New
                \;color\:black&quot;">2.5.5.2</span></b></a><a
            name="section-2.5.5.2" moz-do-not-send="true"></a><b><span
              style="font-size:10.0pt;font-family:&quot;Courier New
              \;color\:black&quot;">.  IPv4-Mapped IPv6 Address</span></b><o:p></o:p></h5>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-size:10.0pt"> </span><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-size:10.0pt"> </span><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-size:10.0pt">   A second type of IPv6
            address that holds an embedded IPv4 address is</span><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-size:10.0pt">   defined.  <span
              style="background:yellow;mso-highlight:yellow">
              This address type is used to represent the addresses of</span></span><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span
            style="font-size:10.0pt;background:yellow;mso-highlight:yellow">  
            IPv4 nodes as IPv6 addresses</span><span
            style="font-size:10.0pt">.</span><o:p></o:p></p>
        <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"> </span></i></b><o:p></o:p></p>
        <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">From
                my POV this means that a /128 prefix associated with an
                IPv4-mapped IPv6 address and a /32 prefix associated
                with the IPv4 address that was mapped to this IPv6
                address represent the same entity. This understanding
                fully matches usage of IPv4-mapped IPv6 addresses as BGP
                Next Hops of VPN-IPv6 addresses defined in RFC 4798.
                However, the comparison rules you have defined will
                treat them as two different prefixes.  I wonder if these
                rules, in the case of a conflict, could result in
                preferring the IPv6 prefix to an IPv4 one and therefore
                loosing MPLS connectivity for the ingress PE of a 6VPE
                service to its egress PE?</span></i></b><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span style="font-family:&quot;Times New
                Roman&quot;,serif">##Ahmed: The basic MPLS architecture
                does not forbid assigning different labels to the same
                prefix, nonetheless to different prefixes belonging to
                the same node or the same interface on the same node.
                One of the fundamental concepts of SR-MPLS is that the
                same prefix-SID must not be assigned to two different
                prefixes. So for the particular scenario of embedding
                IPv4 in IPv6, the operator must assign different SIDs to
                the IPv4 address and the IPv4-mapped IPv6 address that
                embeds it, otherwise the label will be subject to the
                incoming label collision resolution<br>
                <br>
                <br>
                <br>
              </span></i></b><o:p></o:p></p>
        <p class="MsoNormal"><span style="font-family:&quot;Times New
            Roman \,serif&quot;"><br>
            <br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <div>
              <p class="MsoListParagraph"
                style="margin-left:72.0pt;text-indent:-18.0pt"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">f.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">    
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Section
                  2.5.1 defines 3 types of SR-MPLS FECs, but I am not
                  sure all SID types defined in the Segment Routing
                  Architecture draft can be unambiguously mapped to one
                  of these types. Problematic examples include at least
                  the following:</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:108.0pt;text-indent:-108.0pt"><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">                                        
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">i.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Parallel
                  Adjacency SID</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:108.0pt;text-indent:-108.0pt"><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">                                       
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">ii.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Mirror
                  SID</span><o:p></o:p></p>
              <p class="MsoNormal" style="margin-left:72.0pt"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Explicit
                  mapping of SID types to SR-MPLS FEC types would be
                  most useful IMO. If some SID types cannot be mapped to
                  SR-MPLS FECs, this must be explicitly stated in the
                  draft.</span><o:p></o:p></p>
            </div>
          </div>
        </blockquote>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
            <br>
            Parallel adjacency SID are handled in the type "(next-hop,
            outgoing interface)" </span>
          <o:p></o:p></p>
        <p class="MsoNormal"
          style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                OK</span></i></b><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif"><br>
            Mirror SID is a type of binding-SID as mentioned in Section
            5.1 in the SR architecture draft
            (draft-ietf-spring-segment-routing-15). Also as described in
            Section 2.4 draft-ietf-isis-segment-routing-extensions-18
            (also see the equivalent in the OSPFv2 and OSPFv3 draft), a
            binding SID is identified by a prefix. Hence it is covered
            by the type "(Prefix, Routing Instance, Topology,
            Algorithm)"</span><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                I respectfully disagree. There is definitely no mention
                of Algorithm in the definition of the Mirror SID.
              </span></i></b><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span style="font-family:&quot;Times New
                Roman&quot;,serif">##Ahmed: <br>
                The last paragraph in Section 2 of
                draft-ietf-spring-segment-routing-14 says</span></i></b><o:p></o:p></p>
        <pre>   We call "MPLS Control Plane Client (MCC)" any control plane entity<o:p></o:p></pre>
        <pre>   installing forwarding entries in the MPLS data plane. <o:p></o:p></pre>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span style="font-family:&quot;Times New
                Roman&quot;,serif">The sentence starting at the 5th line
                of the first bullet of Section 2.5 of
                draft-ietf-spring-segment-routing-14 says</span></i></b><o:p></o:p></p>
        <pre>For MCCs where the "Topology" and/or "Algorithm"<o:p></o:p></pre>
        <pre>      fields are not defined, the numerical value of zero MUST be used<o:p></o:p></pre>
        <pre>      for these two fields. <o:p></o:p></pre>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span style="font-family:&quot;Times New
                Roman&quot;,serif">If a binding-SID is downloaded to the
                forwarding plane, then it must be associated with an MCC
                and hence it either has an "algorithm" or the value zero
                is assumed for the "algorithm" field. If the binding-SID
                is not downloaded to the forwarding plane, then it is
                irrelevant to the entire draft not only to incoming
                label collision</span></i></b><span
            style="font-family:&quot;Times New Roman&quot;,serif"><br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif"><br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <p class="MsoListParagraph" style="text-indent:-18.0pt"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">6.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><b><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Node
                  SIDs in SR-MPLS</span></b><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:</span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="margin-left:72.0pt;text-indent:-18.0pt"><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">a.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Node
                SIDs are explicitly defined and discussed in the Segment
                Routing Architecture draft but are not mentioned even
                once in this draft</span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="margin-left:72.0pt;text-indent:-18.0pt"><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">b.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">AFAIK,
                the common implementation practice today includes
                assignment of at least one Node SID to every node in the
                SR-MPLS domain</span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="margin-left:72.0pt;text-indent:-18.0pt"><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">c.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Is
                there a requirement to assign at least one Node SID per
                {routing instance, topology, algorithm} in SR-MPLS? If
                not, can the authors explain expected behavior of such a
                node? (See also my comment about routing instances
                below).</span><o:p></o:p></p>
          </div>
        </blockquote>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
            A Node-SID is a special case of prefix-SID. So there nothing
            specific about it from the MPLS forwarding plane point of
            view. Similarly from a standard tracks draft point of view,
            there is no requirement to assign a SID to every prefix just
            like there is no requirement to bind every prefix to an LDP
            label. Common and/or recommended practices or description of
            deployment scenarios are more befitting to BCP or
            informational drafts. This draft is a standards track draft</span><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                Well, you’ve just said that conflict resolution rules
                are RECOMMENDED, and this is quite common in the
                Standards Track RFCs.
              </span></i></b><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span style="font-family:&quot;Times New
                Roman&quot;,serif">##Ahmed: OK., I think we are in
                agreement here:)</span></i></b><span
            style="font-family:&quot;Times New Roman&quot;,serif"><br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif"><br>
            If a {routing instance, topology, algorithm} is not assigned
            a SID, then this FEC is totally irrelavant to this draft and
            hence describing how a node treats it is totally outside the
            scope of this draft</span><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                AFAIK, neither of the SR extension drafts for IGPs
                mention routing instances that can be associated with
                the prefix, so I think that your reference to it is
                incorrect.</span></i></b><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">What’s
                more I suspect that Node SIDs represent the most used
                special case of Prefix SIDs with Anycast SIDs being
                quite behind.  Therefore some recommendation pertaining
                to the usage of Node SIDs would be very much in place
                IMHO. </span></i></b><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span style="font-family:&quot;Times New
                Roman&quot;,serif">##Ahmed: The  term "routing instance"
                within the context of incoming label collision is
                defined in the first bullet in Section 2.5.
                <br>
                As for any recommendation for useage of node-SID,
                anycast-SID,...,etc , it is out of the scope of this
                draft because it is a matter of of
                deployment/informational/BCP draft<br>
                <br>
                <br>
              </span></i></b><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif"><br>
            <br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <p class="MsoListParagraph" style="text-indent:-18.0pt"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">7.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><b><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">SRGB
                  Size in SR-MPLS</span></b><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:
              </span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="margin-left:72.0pt;text-indent:-18.0pt"><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">a.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">The
                draft correctly treats the situation when an index
                assigned to some global SID cannot be mapped to a label
                using the procedure in Section 2.4 as a conflict.</span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="margin-left:72.0pt;text-indent:-18.0pt"><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">b.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">At
                the same time the draft does not define any minimum size
                of SRGB (be it defined as a single contiguous block or
                as a sequence of such blocks) that MUST be implemented
                by all SR-capable nodes</span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="margin-left:72.0pt;text-indent:-18.0pt"><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">c.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">I
                suspect that lack of such a definition could be
                detrimental to interoperability of SR-MPLS solutions.
                AFAIK, the IETF has been following, for quite some time,
                a policy that some reasonable MUST-to-implement defaults
                should be assigned for all configurable parameters
                exactly in order to prevent this.</span><o:p></o:p></p>
          </div>
        </blockquote>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
            This document specifies how the SRGB is used and the
            behavior of routers when a prefix-SID index maps to a label
            inside and/or outside the SRGB. The actual size of the SRGB
            is a task in partitioning the label space, which is very
            specific to a particular deployment scenario. So IMO it is
            outside the scope of a standards track document. Now that
            SR-MPLS is deployed in many places, I expect the community
            to gain sufficient experience to recommend (or not
            recommend) a particular minimum/maximum size for the SRGB is
            some future informational or BCP draft/RFC</span><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                My reading of your response is that minimum size of SRGB
                is an issue for future study. Can you please just add
                this to the draft?</span></i></b><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span style="font-family:&quot;Times New
                Roman&quot;,serif">##Ahmed: OK. Added a sentence to the
                last paragraph of section 2.3</span></i></b><span
            style="font-family:&quot;Times New Roman&quot;,serif"><br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif"><br>
            <br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <p class="MsoListParagraph" style="text-indent:-18.0pt"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">8.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><b><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Algorithms
                  and Prefix SIDs</span></b><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:</span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="margin-left:72.0pt;text-indent:-18.0pt"><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">a.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">The
                draft mentions Algorithms (as part of SR-MPLS Prefix
                FEC) in, but it does not explicitly link them with the
                Prefix-SID algorithms defined in section 3.1.1 of the
                Segment Routing Architecture draft</span><o:p></o:p></p>
          </div>
        </blockquote>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
            I will just add the reference
          </span><span style="font-family:&quot;Times New Roman
            \,serif&quot;">[I-D.ietf-spring-segment-routing]</span><span
            style="font-family:&quot;Times New Roman&quot;,serif"> right
            beside the first time "Algorithm" is mentioned</span><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">[[Sasha]]
                OK</span></i></b><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif"><br>
            <br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <p class="MsoListParagraph"
              style="margin-left:72.0pt;text-indent:-18.0pt"><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">b.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">From
                my POV, the draft should explicitly state that the
                default Prefix-SID algorithm MUST be implemented in all
                SR-MPLS-compliant routers.</span><o:p></o:p></p>
          </div>
        </blockquote>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
            The specification of what path calculation method should or
            must be supported is a routing protocol property not a
            forwarding plane property. In fact, the choice of a path
            calculation method or algorithm is completely orthogonal to
            the routed protocol. Hence mandating the support of a
            particular routing algorithm is beyond the scope of this
            document.</span><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">[[Sasha]]
                OK</span></i></b><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif"><br>
            <br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <p class="MsoListParagraph"
              style="margin-left:72.0pt;text-indent:-18.0pt"><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">c.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">The
                Segment Routing Architecture draft states (in section
                3.1.3) that “Support of multiple algorithms applies to
                SRv6”. But neither draft states whether multiple
                algorithms apply to SR-MPLS. Can you please clarify this
                point?</span><o:p></o:p></p>
          </div>
        </blockquote>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
            The last paragraph of Section 3.1.2 titled SR-MPLS in
            draft-ietf-spring-segment-routing-15 discusses the support
            of multiple algorithms. So it is implied that the concept of
            algorithm applies to SR-MPLS. Hence there is no need to
            re-mention it here</span><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                The paragraph to which you refer only says that if a
                packet with the active Prefix-SID that is associated
                with a specific algorithm is received by a node that
                does not support this algorithm, this packet will be
                discarded. If this is the only type of support for
                multiple algorithms SR provides, it is not very useful
                IMHO</span></i></b><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">.
              </span></i></b><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span style="font-family:&quot;Times New
                Roman&quot;,serif">##Ahmed: The SR-MPLS draft that we
                are discussing here does not attempt to modify the
                SR-architecture draft. Any concerns related to the
                SR-architecture should be addressed to the
                SR-architecture draft not to this draft. </span></i></b><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif"><br>
            <br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <p class="MsoListParagraph" style="text-indent:-18.0pt"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">9.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><b><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Routing
                  instances and the context for Prefix-SIDs</span></b><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:</span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="margin-left:72.0pt;text-indent:-18.0pt"><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">a.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">The
                Segment Routing Architecture draft states in Section 3.1
                that the “context for an IGP-Prefix segment includes the
                prefix, topology, and algorithm”</span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="margin-left:72.0pt;text-indent:-18.0pt"><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">b.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">This
                draft seems to define (in section 2.5) the context for
                the Prefix SID as “Prefix, Routing Instance, Topology,
                Algorithm” where ”a routing instance is identified by a
                single incoming label downloader to FIB” (but the notion
                of the label downloader to FIB is not defined).</span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="margin-left:72.0pt;text-indent:-18.0pt"><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">c.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">These
                two definitions look different to me.
              </span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="margin-left:72.0pt;text-indent:-18.0pt"><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">d.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">At
                the very least I would expect alignment between the
                definitions of context for the Prefix-SID between the
                two drafts. Preferably, the definition given in the
                Segment Routing Architecture draft should be used in
                both drafts.</span><o:p></o:p></p>
          </div>
        </blockquote>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
            The context of the section 2.5 is limited to the resolution
            of local label collision. The use of "routing instance" in
            section 2.5 is just there for tie-breaking if there is local
            label collision.</span><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                I have already mentioned that “routing instances” are
                not defined in any the drafts dealing with SR Extensions
                for IGPs. So I do not understand how the conflict
                resolution procedure is supposed to use this. And in any
                case the difference between two definitions of the
                context of Prefix-SID requires some explanation.</span></i></b><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span style="font-family:&quot;Times New
                Roman&quot;,serif">##Ahmed: incoming label collision
                defines what is a routing instance within its context. I
                do not understand what explanation you are looking for</span></i></b><span
            style="font-family:&quot;Times New Roman&quot;,serif"><br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif"><br>
            <br>
            <br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <p class="MsoListParagraph" style="text-indent:-18.0pt"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">10.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">
              </span><b><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Example
                  of PUSH operation in Section 2.10.1</span></b><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:</span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="margin-left:72.0pt;text-indent:-18.0pt"><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">a.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">The
                first para of this section begins with the sentence
                “Suppose an MCC on a router "R0" determines that PUSH or
                CONTINUE   operation is to be applied to an incoming
                packet whose active SID is the global SID "Si"”. In the
                context of SR-MPLS this means (to me) that the incoming
                packet is a labeled packet and its top label matches the
                global SID “Si”.
              </span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="margin-left:72.0pt;text-indent:-18.0pt"><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">b.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">However,
                the example for PUSH operation in the next para of this
                section is the case of an (unlabeled) IP packet with the
                destination address covered by the IP prefix for which
                “Si” has been assigned. </span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="margin-left:72.0pt;text-indent:-18.0pt"><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">c.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">From
                my POV:</span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="margin-left:108.0pt;text-indent:-108.0pt"><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">                                        
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">i.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Mapping
                unlabeled packets to SIDs is indeed out of scope of the
                draft. Therefore an example of a PUSH operation that is
                applied to a labeled packet (with the active SID
                inferred from the top label in the stack) is preferable.</span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="margin-left:108.0pt;text-indent:-108.0pt"><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">                                       
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">ii.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Valid
                examples of  PUSH operation applied to a labeled
                incoming packet can be found in Sections 4.2 or 4.3 of
                the
                <a
href="https://tools.ietf.org/html/draft-bashandy-rtgwg-segment-routing-ti-lfa-04"
                  moz-do-not-send="true">
                  TI-LFA</a> draft</span><o:p></o:p></p>
            <p class="MsoNormal"><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
          </div>
        </blockquote>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
            I do not understand your concern here:)<br>
            <br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                I think it is pretty clear: can you provide an example
                of a PUSH operation applied to a labeled packet instead
                of your current example?</span></i></b><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span style="font-family:&quot;Times New
                Roman&quot;,serif">##Ahmed: The example in the draft is
                included to clarify the concept of a prefix SID attached
                to a prefix. As mentioned more than once, SR-MPLS does
                not modify MPLS forwarding including pushing a label on
                a labeled packet. It is something that has been done by
                routers and switches for 20+ years. So including it here
                is redundant</span></i></b><span
            style="font-family:&quot;Times New Roman&quot;,serif"><br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <p class="MsoNormal"><b><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Nits</span></b><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:</span>
              <o:p></o:p></p>
            <p class="MsoListParagraph" style="text-indent:-18.0pt"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">1.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">I
                concur with Adrian regarding numerous nits he has
                reported in his
                <a
href="https://mailarchive.ietf.org/arch/msg/spring/FRhO2lgR8r4VlKP2ZN2dZwHU5BY"
                  moz-do-not-send="true">
                  WG LC Comment</a>. I would like to thank Adrian for an
                excellent review that have saved me lots of hard work.</span><o:p></o:p></p>
          </div>
        </blockquote>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
            I also agree that Adrian's review is exceptional. I believe
            I addressed all his comments in the latest version.<br>
            <br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <p class="MsoListParagraph" style="text-indent:-18.0pt"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">2.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">In
                addition, I’d like to report the following nits:</span><o:p></o:p></p>
            <p class="MsoListParagraph"
              style="margin-left:72.0pt;text-indent:-18.0pt"><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">a.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Ti-LFA
                in Section 2.11.1 should be TI-LFA (as in the
                <a
href="https://tools.ietf.org/html/draft-bashandy-rtgwg-segment-routing-ti-lfa-04"
                  moz-do-not-send="true">
                  TI-LFA</a> draft)</span><o:p></o:p></p>
          </div>
        </blockquote>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
            Already done in the latest version</span><b><i>[[Sasha]] OK</i></b>
          <span style="font-family:&quot;Times New Roman \,serif&quot;"><br>
            <br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <p class="MsoListParagraph"
              style="margin-left:72.0pt;text-indent:-18.0pt"><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">b.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">TI-LFA
                draft is referenced in the text of Section 2.11.1, but
                there is no matching reference in the “References”
                section (probably, Informational)</span><o:p></o:p></p>
          </div>
        </blockquote>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
            Already done in the latest version</span><b><i>[[Sasha]] OK</i></b>
          <span style="font-family:&quot;Times New Roman \,serif&quot;"><br>
            <br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <p class="MsoListParagraph"
              style="margin-left:72.0pt;text-indent:-18.0pt"><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">c.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">“zero
                Algorithm” in Section 2.5 (immediately above Section
                2.5.1) must be replaced with “default algorithm”.
                Similarly, “non-zero Algorithm” should be replaced with
                “non-default algorithm”</span><o:p></o:p></p>
          </div>
        </blockquote>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
            Will be done in the next version</span><b><i>[[Sasha]]
            </i></b> OK<span style="font-family:&quot;Times New
            Roman&quot;,serif"><br>
            <br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <p class="MsoListParagraph" style="text-indent:-18.0pt"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">3.</span><span
                style="font-size:7.0pt;font-family:&quot;Times New Roman
                \,serif&quot;">   
              </span><span
                style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">I
                think that RFC 3443 and RFC 5332 should be listed as
                Normative references in this draft while RFC 5331 and
                RFC 8277 should be listed as Informative references.
                This would improve the readability of the draft without
                any impact on its advancement. </span><o:p></o:p></p>
            <p class="MsoNormal"> <o:p></o:p></p>
          </div>
        </blockquote>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed
            RFC5331 describes upstream label assignment. As you
            mentioned above (and I will modify the draft to indicate
            that) SR-MPLS behavior is similar to downstream label
            assignment. RFC 3443 describes TTL behavior. This is an MPLS
            forwarding behavior. As mentioned in the draft, SR-MPLS does
            not modify at the MPLS forwarding behavior</span><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                Regarding RFC 5331 – you may skip this reference if you
                state (as discussed below) that SR-MPLS only allocates
                labels from the per-platform label space. Regarding RFC
                3443 – I do not think that you can fully avoid
                discussion of Uniform and Pipe/Short Pipe models, and
                therefore you will need this reference.</span></i></b><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <b><i><span style="font-family:&quot;Times New
                Roman&quot;,serif">##Ahmed: I did not add rfc5331 as a
                reference . Again pushing multiple labels on top of a
                packet is a matter of SR-policy, which is handled in a
                separate draft.
              </span></i></b><span style="font-family:&quot;Times New
            Roman&quot;,serif"><br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif"><br>
            <br>
            <br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <p class="MsoNormal">Hopefully, these comments will be
              useful.<o:p></o:p></p>
          </div>
        </blockquote>
        <p class="MsoNormal"
          style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
            They are certainly quite useful. Thanks a lot<br>
            <br>
            <br>
            <br>
          </span><o:p></o:p></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <p class="MsoNormal"> <o:p></o:p></p>
            <p class="MsoNormal">Regards,<o:p></o:p></p>
            <p class="MsoNormal">Sasha<o:p></o:p></p>
            <p class="MsoNormal"> <o:p></o:p></p>
            <p class="MsoNormal">Office: +972-39266302<o:p></o:p></p>
            <p class="MsoNormal">Cell:      +972-549266302<o:p></o:p></p>
            <p class="MsoNormal">Email:   <a
                href="mailto:Alexander.Vainshtein@ecitele.com"
                moz-do-not-send="true">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
            <p class="MsoNormal"> <o:p></o:p></p>
          </div>
          <p class="MsoNormal"
            style="margin:0cm;margin-bottom:.0001pt;line-height:normal">
            <span style="font-family:&quot;Times New Roman&quot;,serif"><br
                clear="all">
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To: Shraddha Hegde <shraddha@juniper.net>, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "'mpls@ietf.org'" <mpls@ietf.org>,  "'adrian@olddog.co.uk'" <adrian@olddog.co.uk>, "Jonathan Hardwick (Jonathan.Hardwick@metaswitch.com)" <jonathan.hardwick@metaswitch.com>, "spring@ietf.org" <spring@ietf.org>, "spring-chairs@ietf.org" <spring-chairs@ietf.org>, "draft-ietf-spring-segment-routing-mpls.authors@ietf.org" <draft-ietf-spring-segment-routing-mpls.authors@ietf.org>
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From: Ahmed Bashandy <abashandy.ietf@gmail.com>
Message-ID: <c33105ce-41b2-3beb-f8d7-826999a8f588@gmail.com>
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Subject: Re: [mpls] RtgDir Early review: draft-ietf-spring-segment-routing-mpls-13
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Thanks for the comments

While it is a clear violation of the SR architecture RFC (8402), more 
than one node advertising the same IPv4/6 PREFIX and both have the same 
prefix-SID value with "N" flag is not an incoming label collision 
because the label is associated with the same FEC, which is the prefix.

Hence handling such violation is not an SR-MPLS problem because there is 
no incoming label collision and hence it it is outside the scope of this 
draft


The second issue is which SID to choose for an SR-policy (be it a policy 
for TE, ti-lfa, uloop avoidance, security,..., etc). That is strictly a 
control layer functionality and is not specific to SR-MPLS. Hence it is 
outside the scope of this draft


The third issue is the case where an anycast prefix is advertised with a 
prefix-SID sub-TLV by some (but not all) of the nodes that advertise 
that prefix. Again this is not an incoming label collision because the 
label is associated with a single FEC, which is the anycast prefix.


On 7/19/18 8:30 PM, Shraddha Hegde wrote:
>
> Hi Ahmed,
>
> The Node-SIDs are expected to be unique to a node.
>
> “
>
>    An IGP Node-SID MUST NOT be associated with a prefix that is owned by
>
>    more than one router within the same routing domain.”
>
> If two different nodes advertise same Node-SID,
>
> For Example Node A and B both advertise prefix 1.1.1.1 and associate a 
>  SID 1000 with N bit set.
>
> There is an anomaly here and IMO, this draft should address how to 
> handle this anomaly and whether TI-LFA and other
>
> Applications can use this SID as a Node-SID.
>
> Another slight variation of this case is a scenario where A and B both 
> advertise a prefix 1.1.1.1 and A assigns a Node-Sid
>
> Of 1000 and B does not assign any SID.
>
> Rgds
>
> Shraddha
>
> *From:*Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
> *Sent:* Thursday, July 19, 2018 10:05 PM
> *To:* Ahmed Bashandy <abashandy.ietf@gmail.com>
> *Cc:* rtg-dir@ietf.org; 'mpls@ietf.org' <mpls@ietf.org>; 
> 'adrian@olddog.co.uk' <adrian@olddog.co.uk>; Jonathan Hardwick 
> (Jonathan.Hardwick@metaswitch.com) <jonathan.hardwick@metaswitch.com>; 
> Shraddha Hegde <shraddha@juniper.net>; spring@ietf.org; 
> spring-chairs@ietf.org; 
> draft-ietf-spring-segment-routing-mpls.authors@ietf.org
> *Subject:* RE: RtgDir Early review: 
> draft-ietf-spring-segment-routing-mpls-13
>
> Ahmed hi!
>
> Lots of thanks for your response.
>
> Of course Node SIDs are not different from any other Prefix SIDs when 
> it comes to the MPLS forwarding plane.
>
> But, IMHO, strictly speaking, this is correct for any other SID as well.
>
> You seem to ignore the difference between SR-MPLS and SRv6 with regard 
> to the life span of prefix SIDs in general and Node SIDs in 
> particular. From my POV this difference should be discussed in the draft.
>
> So it seems that we can only “agree to disagree” on the need to say 
> something specific about Node SIDs in the draft, and let the WG to 
> decide what to do about it.
>
> Regards,
>
> Sasha
>
> Office: +972-39266302
>
> Cell: +972-549266302
>
> Email: Alexander.Vainshtein@ecitele.com 
> <mailto:Alexander.Vainshtein@ecitele.com>
>
> *From:*Ahmed Bashandy [mailto:abashandy.ietf@gmail.com]
> *Sent:* Thursday, July 19, 2018 7:13 PM
> *To:* Alexander Vainshtein <Alexander.Vainshtein@ecitele.com 
> <mailto:Alexander.Vainshtein@ecitele.com>>
> *Cc:* rtg-dir@ietf.org <mailto:rtg-dir@ietf.org>; 'mpls@ietf.org' 
> <mpls@ietf.org <mailto:mpls@ietf.org>>; 'adrian@olddog.co.uk' 
> <adrian@olddog.co.uk <mailto:adrian@olddog.co.uk>>; Jonathan Hardwick 
> (Jonathan.Hardwick@metaswitch.com 
> <mailto:Jonathan.Hardwick@metaswitch.com>) 
> <jonathan.hardwick@metaswitch.com 
> <mailto:jonathan.hardwick@metaswitch.com>>; shraddha@juniper.net 
> <mailto:shraddha@juniper.net>; spring@ietf.org 
> <mailto:spring@ietf.org>; spring-chairs@ietf.org 
> <mailto:spring-chairs@ietf.org>; 
> draft-ietf-spring-segment-routing-mpls.authors@ietf.org 
> <mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org>
> *Subject:* Re: RtgDir Early review: 
> draft-ietf-spring-segment-routing-mpls-13
>
> Thanks for the reply
>
> See inline
>
> Ahmed
>
> On 7/12/18 12:22 AM, Alexander Vainshtein wrote:
>
>     Ahmed and all,
>
>     I would like to expand on my comments (and your responses) about
>     the role of Node SIDs in SR-MPLS.
>
>     I would like to bring your attention two points:
>
>     1.Node SIDs (and, in general, Prefix SIDs) in MPLS-SR are
>     different from the same in SRv6 because they require explicit
>     configuration action by the operator of SR domain. I.e., it is not
>     enough for a node to own some /32 or /128 prefix that is
>     advertised by IGP. The operator must explicitly configure the node
>     to use such a prefix as  Node SID and to assign to it a specific
>     index that is unique in the SR domain. From my POV, this
>     difference alone would qualify Node SIDs as a topic to be
>     discussed in the MPLS-SR Architecture
>     <https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_draft-2Dietf-2Dspring-2Dsegment-2Drouting-2Dmpls-2D14&d=DwMGaQ&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&s=q6djpRXlamUzKZlGIuXTtBcsnwevHwddqvStZrSFMnE&e=>
>     draft.
>
> #Ahmed: I disagree with your POV. From the forwarding plane 
> perspective it does not make any difference whether a the label at the 
> top of an MPLS packet (representing the prefix-SID) identifies a node 
> or not. So from the SR-mpls forwarding point of view there is no 
> difference between a prefix-SID and a node-SID. If there is any place 
> in the SR-mpls draft where there is a need to handle a node-SID 
> different from a prefix SID, it would be great to point it out
>
>
>           2.In addition, quite a few constructs associated with
>           SR-MPLS implicitly assume that each node in the SR-MPLS
>           domain is assigned with at least one Node SID. One example
>           can be found in the TI-LFA
>           <https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_draft-2Dbashandy-2Drtgwg-2Dsegment-2Drouting-2Dti-2Dlfa-2D04&d=DwMGaQ&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&s=jbH0DSYYo2UYymWZrlvAt7qUWVXsYKuCtMiEyoe-DWE&e=>
>           draft. This draft says in Section 4.2:
>
>
>           4.2
>           <https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_draft-2Dbashandy-2Drtgwg-2Dsegment-2Drouting-2Dti-2Dlfa-2D04-23section-2D4.2&d=DwMGaQ&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&s=sAi3KCWUwGS3D93t8ic64W_46xm9y8Oacs7ozcAweS8&e=>.
>           The repair node is a PQ node
>
>        When the repair node is in P(S,X), the repair list is made of a
>
>        single node segment to the repair node.
>
>     In the scope of this section, the repair node is not adjacent to
>     the PLR, and therefore, to the best of my understanding,  “a
>     single node segment to the repair node” can be only the Node SID
>     of the repair node. Since repair nodes are computed dynamically,
>     this entire scheme depends on all nodes in the MPLS=SR domain
>      having at least one Node SID each
>
> #Ahmed: The choice of the SID to identify an intermediate or exit 
> node(s) in an SR-policy is a control plane behavior, irrespective of 
> reason such policy is created (be it ti-lfa explicit path, uloop 
> avoidance explicit path, or some SR-TE explicit path). SR-Policy as 
> well as Ti-LFA and uloop avoidance are handled in separate drafts. So 
> just like the response to your previous comment, from forwarding plane 
> perspective it does not make any difference whether the label at the 
> top of an MPLS packet identifies a single or multiple nodes.
>
>     .
>
>     Hopefully these notes clarify my position on the subject.
>
>     Regards,
>
>     Sasha
>
>     Office: +972-39266302
>
>     Cell: +972-549266302
>
>     Email: Alexander.Vainshtein@ecitele.com
>     <mailto:Alexander.Vainshtein@ecitele.com>
>
>     *From:*Alexander Vainshtein
>     *Sent:* Wednesday, July 11, 2018 12:02 PM
>     *To:* Ahmed Bashandy <abashandy.ietf@gmail.com>
>     <mailto:abashandy.ietf@gmail.com>
>     *Cc:* rtg-dir@ietf.org <mailto:rtg-dir@ietf.org>; 'mpls@ietf.org
>     <mailto:mpls@ietf.org>' <mpls@ietf.org> <mailto:mpls@ietf.org>;
>     'adrian@olddog.co.uk <mailto:adrian@olddog.co.uk>'
>     <adrian@olddog.co.uk> <mailto:adrian@olddog.co.uk>; Jonathan
>     Hardwick (Jonathan.Hardwick@metaswitch.com
>     <mailto:Jonathan.Hardwick@metaswitch.com>)
>     <jonathan.hardwick@metaswitch.com>
>     <mailto:jonathan.hardwick@metaswitch.com>; shraddha@juniper.net
>     <mailto:shraddha@juniper.net>; spring@ietf.org
>     <mailto:spring@ietf.org>; spring-chairs@ietf.org
>     <mailto:spring-chairs@ietf.org>;
>     draft-ietf-spring-segment-routing-mpls.authors@ietf.org
>     <mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org>
>     *Subject:* RE: RtgDir Early review:
>     draft-ietf-spring-segment-routing-mpls-13
>
>     Ahmed, and all,
>
>     Lots of thanks for a detailed response to my comments.
>
>     Please see */inline below/*my position on each of them.
>
>     Regards,
>
>     Sasha
>
>     Office: +972-39266302
>
>     Cell: +972-549266302
>
>     Email: Alexander.Vainshtein@ecitele.com
>     <mailto:Alexander.Vainshtein@ecitele.com>
>
>     *From:*Ahmed Bashandy [mailto:abashandy.ietf@gmail.com]
>     *Sent:* Wednesday, July 11, 2018 4:42 AM
>     *To:* Alexander Vainshtein <Alexander.Vainshtein@ecitele.com
>     <mailto:Alexander.Vainshtein@ecitele.com>>; spring-chairs@ietf.org
>     <mailto:spring-chairs@ietf.org>;
>     draft-ietf-spring-segment-routing-mpls.authors@ietf.org
>     <mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org>
>     *Cc:* rtg-dir@ietf.org <mailto:rtg-dir@ietf.org>; 'mpls@ietf.org
>     <mailto:mpls@ietf.org>' <mpls@ietf.org <mailto:mpls@ietf.org>>;
>     'adrian@olddog.co.uk <mailto:adrian@olddog.co.uk>'
>     <adrian@olddog.co.uk <mailto:adrian@olddog.co.uk>>; Jonathan
>     Hardwick (Jonathan.Hardwick@metaswitch.com
>     <mailto:Jonathan.Hardwick@metaswitch.com>)
>     <jonathan.hardwick@metaswitch.com
>     <mailto:jonathan.hardwick@metaswitch.com>>; shraddha@juniper.net
>     <mailto:shraddha@juniper.net>; spring@ietf.org
>     <mailto:spring@ietf.org>
>     *Subject:* Re: RtgDir Early review:
>     draft-ietf-spring-segment-routing-mpls-13
>
>     Thanks for thorough (and VERY clear) the review
>
>     See inline #Ahmed
>
>     Ahmed
>
>     On 6/15/18 11:08 PM, Alexander Vainshtein wrote:
>
>         Re-sending to  correct SPRING WG list.
>
>         Sincere apologies for the delay caused by a typo.
>
>         Thumb typed by Sasha Vainshtein
>
>         ------------------------------------------------------------------------
>
>         *From:* Alexander Vainshtein
>         *Sent:* Sunday, June 10, 2018 10:43:52 AM
>         *To:* spring-chairs@ietf.org <mailto:spring-chairs@ietf.org>;
>         draft-ietf-spring-segment-routing-mpls.authors@ietf.org
>         <mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org>
>         *Cc:* spring@ietf.com <mailto:spring@ietf.com>;
>         rtg-dir@ietf.org <mailto:rtg-dir@ietf.org>; 'mpls@ietf.org
>         <mailto:mpls@ietf.org>'; 'adrian@olddog.co.uk
>         <mailto:adrian@olddog.co.uk>'; Jonathan Hardwick
>         (Jonathan.Hardwick@metaswitch.com
>         <mailto:Jonathan.Hardwick@metaswitch.com>);
>         shraddha@juniper.net <mailto:shraddha@juniper.net>
>         *Subject:* RE: RtgDir Early review:
>         draft-ietf-spring-segment-routing-mpls-13
>
>         Explicitly adding Shraddha  who is the shepherd of this draft.
>
>         Regards,
>
>         Sasha
>
>         Office: +972-39266302
>
>         Cell: +972-549266302
>
>         Email: Alexander.Vainshtein@ecitele.com
>         <mailto:Alexander.Vainshtein@ecitele.com>
>
>         *From:* Alexander Vainshtein
>         *Sent:* Friday, June 8, 2018 5:43 PM
>         *To:* 'spring-chairs@ietf.org <mailto:spring-chairs@ietf.org>'
>         <spring-chairs@ietf.org> <mailto:spring-chairs@ietf.org>;
>         'draft-ietf-spring-segment-routing-mpls.authors@ietf.org
>         <mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org>'
>         <draft-ietf-spring-segment-routing-mpls.authors@ietf.org>
>         <mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org>
>         *Cc:* 'spring@ietf.com <mailto:spring@ietf.com>'
>         <spring@ietf.com> <mailto:spring@ietf.com>; rtg-dir@ietf.org
>         <mailto:rtg-dir@ietf.org>; mpls@ietf.org
>         <mailto:mpls@ietf.org>; 'adrian@olddog.co.uk
>         <mailto:adrian@olddog.co.uk>' <adrian@olddog.co.uk>
>         <mailto:adrian@olddog.co.uk>
>         *Subject:* RtgDir Early review:
>         draft-ietf-spring-segment-routing-mpls-13
>
>         Hello,
>
>         I have been selected to do a routing directorate “early”
>         review of this draft:
>         https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/
>         <https://urldefense.proofpoint.com/v2/url?u=https-3A__datatracker.ietf.org_doc_draft-2Dietf-2Dspring-2Dsegment-2Drouting-2Dmpls_&d=DwMGaQ&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&s=Cxbaaf9U0kj6_meVSobSkRLQW1SwI8MJvgHpuYp0QOM&e=>
>
>         The routing directorate will, on request from the working
>         group chair, perform an “early” review of a draft before it is
>         submitted for publication to the IESG. The early review can be
>         performed at any time during the draft’s lifetime as a working
>         group document. The purpose of the early review depends on the
>         stage that the document has reached. As this document is
>         currently in the WG Last call, my focus for the review was to
>         determine whether the document is ready to be published.
>         Please consider my comments along with the other working group
>         last call comments.
>
>         For more information about the Routing Directorate, please see
>         ​http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir
>         <https://urldefense.proofpoint.com/v2/url?u=http-3A__trac.tools.ietf.org_area_rtg_trac_wiki_RtgDir&d=DwMGaQ&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&s=6pnI7l82ewwzoxgOXqTKrbKuQidt6-KBsZdsXFnoQCg&e=>
>
>
>         *Document*: draft-ietf-spring-segment-routing-mpls-13
>
>         *Reviewer*: Alexander (“Sasha”) Vainshtein
>         (alexander.vainshtein@ecitele.com
>         <mailto:alexander.vainshtein@ecitele.com>)
>
>         *Review Date*: 08-Jun-18
>
>         *Intended Status*: Proposed Standard.
>
>         *Summary*:
>
>         I have some minor concerns about this document that I think
>         should be resolved before it is submitted to the IESG.
>
>         *Comments*:
>
>         I consider this draft as an important  companion document to
>         the Segment Routing Architecture
>         <https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_draft-2Dietf-2Dspring-2Dsegment-2Drouting-2D15&d=DwMGaQ&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&s=iJShh7e7yyVkt44v1O5pyCOMfHCpAvfBNGgFr5lk130&e=>
>         draft that, ideally, should augment definitions of the Segment
>         Routing (SR) notions and constructs given there with details
>         specific for the SR instantiation that uses the MPLS data
>         plane (SR-MPLS).  Many issues raised in my review reflect
>         either gaps that should be, but have not been, closed, or
>         inconsistencies between the two drafts.
>
>         Since RFC 8287
>         <https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_rfc8287&d=DwMGaQ&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&s=y7jp3UYNTtcmm9HOulzqPTrMURTrsMiO26rWlNZN5Ws&e=>
>         is already published as a Standards Track RFC, I expect such
>         augmentation to be backward compatible with this document (or
>         to provide clear indications of required updates to this
>         document). And I include the MPLS WG into distribution list.
>
>         This draft was not easy reading for me. In particular, the
>         style of Section 2.5 that discusses at length and in some
>         detail multiple “corner cases” resulting, presumably, from
>         misconfiguration, before it explains the basic (and relatively
>         simple) “normal” behavior, looks problematic to me.
>
>         The WG Last Call has been extended by one week. Nevertheless,
>         I am sending out my comments
>
>         *Major Issues*: None found
>
>     #Ahmed: thanks a lot
>
>         *Minor Issues*: Quite a few but, hopefully, easy to resolve.
>
>         1.*Encapsulation of SR-MPLS packets*:
>
>         a.RFC 3032 (referenced by the draft) and RFC 5332 (*/not
>         mentioned in the draft/*) depend two encapsulations of labeled
>         packets - one for Downstream-allocated labels and another for
>         Upstream-allocated ones.
>
>     #Ahmed: RFC5332 is for multicast. As mentioned in Section 6 of
>     draft-ietf-spring-segment-routing-15, multicast is outside the
>     scope of SR. Hence the RFC was not referred to in the SR-MPLS draft
>
>     */[[Sasha]] I would be satisfied with this response, would it not
>     be for the following text I see in Section 2.2 of the/**/SR Policy
>     Architecture
>     <https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_draft-2Dietf-2Dspring-2Dsegment-2Drouting-2Dpolicy-2D01&d=DwMGaQ&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&s=4f0H68LTvkp7N-bYTVLOhWqiEbHaCsOQR1z_Qzz3Wf4&e=>
>     /**/draft:/*
>
>        A variation of SR Policy can be used for packet replication.  A
>
>        candidate path could comprise multiple SID-Lists; one for each
>
>        replication path.  In such a scenario, packets are actually
>
>        replicated through each SID List of the SR Policy to realize a
>     point-
>
>        to-multipoint service delivery.
>
>     */This looks to me as being very much multicast in SR, and, unless
>     you want to say that it is limited to SRv6, makes my question
>     relevant IMHO./*
>
>         b.From my POV the ST-MPLS only uses Downstream-allocated
>         labels – but I expect the draft to state that explicitly, one
>         way or another. (If Upstream-allocated labels are relevant for
>         SR-MPLS, I would see it as a major gap, so I hope that this is
>         not the case).
>
>     #Ahmed: I will add a statement in section 2.2 to mention that it
>     is down-stream allocated as you mentioned
>
>     */[[Sasha]] This is quite unambiguous and, once added, would
>     resolve my comment in full – the previous comment notwithstanding.
>     In particular, it would imply that even labels representing BSIDs
>     of a SR Replication policies will be downstream-allocated. /*
>
>         2.*Label spaces in SR-MPLS*:
>
>         a.RFC 3031 (referenced by the draft) defines per-platform and
>         per-interface label spaces, and RFC 5331 (*/not mentioned in
>         the draft/*) adds context-specific label spaces and context
>         labels.
>
>         b.The draft does not say which of these are or are not
>         relevant for SR-MPLS
>
>         c.From my POV:
>
>         i.Labels representing all kinds of SIDs mentioned in the draft
>         MUST be allocated from the per-platform label space only
>
>         ii.At the same time, instantiation of Mirror Segment IDs
>         defined in Section 5.1 of the Segment Routing Architecture
>         draft using MPLS data plane clearly calls for context labels
>         and context-specific label spaces
>
>         d.I expect the draft to provide a clear-cut position on these
>         aspects of SR-MPLS.
>
>     #Ahmed: I will add a statement to section 2.2 to say that the it
>     is per-platform. Regarding the function "mirroring", SR attaches a
>     *function* to each SID. The "mirroring" function is already
>     described in Section 5.1 of draft-ietf-spring-segment-routing and
>     is not specific to the MPLS forwarding plane. Hence there is no
>     need to re-mention it here because this document is trying to be
>     as specific as possible to the MPLS forwarding plane. General
>     functions attached to SID are described in the segment routing
>     architecture document or future documents. Furture documents
>     proposing new SR function must be as specific and clear as possible
>
>     */[[Sasha]] Looks OK to me./*
>
>         3.*SR-MPLS and hierarchical LSPs*:
>
>         a.SR LSPs that include more than one segment are hierarchical
>         LSPs from the POV of the MPLS data plane. Therefore some
>         (possibly, all) of the models for handling TTL and TC bits
>         that have been defined in RFC 3443 (*/not mentioned in the
>         draft/*) should apply to SR-MPLS
>
>         b.RFC 8287 (*/not referenced in the draft/*) specifically
>         discussed operation of the LSP Traceroute function for SR LSPs
>         in the case when Pipe/Short Pipe model for TTL handling is used
>
>         c.I expect the draft to provide at least some guidelines
>         regarding applicability of each specific model defined in RFC
>         3443 (separately for TTL and TC bits) to SR-MPLS.
>
>     #Ahmed: BY design, the instantiation of SR over the MPLS
>     forwarding plane (and hence this draft) does not modify the MPLS
>     forwarding plan behavior as it is mentioned in the first sentence
>     in Section 1. So the TTL behavior specified in rfc3443 is already
>     implied and there is no need to re-mention it here just like all
>     aspects of MPLS forwarding. RFC8287 is OAM-specific. SR-OAM is
>     handled in a separate document so is outside the scope of this draft
>
>     */[[Sasha]] Unfortunately I do not think this is good enough. Let
>     me ask a specific question reflecting my concerns:/*
>
>     */The head-end node sends SR-MPLS packets across a path defined by
>     an ordered set of SIDs with more than one SID in the list. Each
>     SID is represented by a label stack entry (LSE) in the MPLS label
>     stack, and the label field in each LSE is the label that matches
>     the corresponding SID. However, each LSE also includes the TTL and
>     TC fields. How does the head-end node set these fields in each of
>     the LSEs following the top one? This clearly depends on the model
>     (Uniform vs. Pipe/Short Pipe) implemented in each node that that
>     performs Next operation on the packet along the path – but the
>     head-end node usually is not aware of that. /*
>
>     */RFC 8287 is relevant as an example here IMHO because it
>     recommends the following setting of TTL in Traceroute packets:/*
>
>     -*/Set the TTL of all the labels above one that represents the
>     segment you are currently tracing to maximum/*
>
>     -*/Set the TTL of the label one that represents the segment you
>     are currently tracing to the desired value (to be incremented
>     until end of segment is reached/*
>
>     -*/Set the TTL of all the labels below one that represents the
>     segment you are currently tracing to 0./*
>
>     */I expect the draft to provide some recommendations for traffic
>     (non-OAM) packets as well./*
>
>         4.*Inferring network layer protocol in SR-MPLS*:
>
>         a.I wonder if the draft could provide any details on the
>         situation when a label that represents some kind of SID is the
>         bottom-of-stack label to be popped by the egress LER
>
>     #ahmed: This is part of the "Next" function. It is described in
>     detail in this document.
>
>     */[[Sasha]] NEXT function is mentioned in several places in the
>     document. Can you please point to the specific text that is
>     relevant for my question?/*
>
>         b.For the reference, RFC 3032 says that “the identity of the
>         network layer protocol  must be inferable from the value of
>         the label which is popped from  the bottom of the stack,
>         possibly along with the contents  of the network layer header
>         itself”
>
>         c.From my POV the following scenario indicates relevance of
>         this expectation for SR-MPLS:
>
>         i.IS-IS is used for distributing both IPv4 and IPv6
>         reachability in a given domain
>
>         ii.An IS-IS adjacency over some dual-stack link is
>         established, and a single Adj-SID for this adjacency is advertised
>
>         iii.The node that has assigned and advertised this Adj-SID
>         receives a labeled packet with the label representing this
>         Adj-SID being both the top and bottom-of-stack label
>
>         iv.The implementers must be given unambiguous instructions for
>         forwarding the unlabeled packet via the dual-stack link as an
>         Ipv4 or an IPv6 packet.
>
>     #Ahmed: If you take a look at the SR-ISIS , SR-OSPFv2 and SR-OSFv3
>     drafts, you will see all 3 protocol advertise different adj-SIDS
>     for IPv4 next-hop and IPv6 next-hop. For example, ISIS uses the
>     "F-Flag" (section 2.2.1 in
>     draft-ietf-isis-segment-routing-extensions-18) to specify whether
>     the adj-SID is for IPv4 and IPv6. Similarly, the SR-ISIS draft
>     attaches a prefix-SID to the prefix advertisement and hence
>     implies the identity of the protocol underneath the bottom most
>     label. For any other "function" attached to a SID, it is part of
>     the specification of this function to describe what happens when
>     the SID is represented by a label in the MPLS forwarding plane and
>     this label is the bottom most label
>
>     */[[Sasha]] OK, got it. This issue is resolved./*
>
>         5.*Resolution**of Conflicts*: Are the
>
>         a.Are the conflict resolution procedures listed in section 2.5
>         mandatory to implement?
>
>         b.If they are mandatory to implement, are they also mandatory
>         to deploy, or can the operators simply treat any detected
>         conflict as requiring human intervention and preventing normal
>         operation of SR-MPLS?
>
>     #Ahmed: They are recommended. I will modify the paragraph after
>     the first 3 bullets in Section 2.5 to say that it is recommeded.
>
>     */[[Sasha]] OK. However, it would be nice if you could refer
>     separately for “RECOMMENDED to implement” and “RECOMMENDED to
>     deploy”.  The latter probably requires a configuration knob for
>     enabling conflict resolution rules (if they are implemented). /*
>
>         c.For the reference, the IETF capitalized MUST appears just in
>         a few places in Section 2.5, and each appearance has very
>         narrow context:
>
>         i.For MCCs where the "Topology" and/or "Algorithm" fields are
>         not defined, the numerical value of zero MUST be used for
>         these two fields
>
>         ii.If the same set of FECs are attached to the same label
>         "L1", then the tie-breaking rules MUST always select the same
>         FEC irrespective of the order in which the FECs and the label
>         "L1" are received. In other words, the tie-breaking rule MUST
>         be deterministic.
>
>         iii.An implementation of explicit SID assignment MUST
>         guarantee collision freeness on the same router
>
>         From my POV, it is not possible to infer the answer to my
>         question from these statements. Some explicit statement is
>         required.
>
>     #Ahmed: I agree with you POV and as mentioned in my reply to items
>     (a) and (b), I will modify the paragraph to say that it is
>     RECOMMENDED to answer you questions in items (a) and (b)
>
>         d.The tie-breaking rules in section 2.5.1 include some
>         specific values for encoding FEC types and address families –
>         but these values are not supposed to appear in any IANA
>         registries (because the draft does not request any IANA
>         actions). Can you please clarify what is so special about
>         these values?
>
>     #Ahmed: There is no significance to the values but there is a
>     significance to the order among them. I will modify the text to
>     clarify that
>
>     */[[Sasha]] OK. /*
>
>         e.I also doubt that comparison of FECs that represent IPv4 and
>         IPv6 prefix SIDs makes much sense (for conflict resolution or
>         else), because, among other things, there are valid scenarios
>         when an IPv4 /32 prefix is embedded in an IPv6 /128 one.
>
>     #Ahmed: A prefix-SID is assigned to a prefix. An IPv6 prefix that
>     embeds an IPv4 prefix is different from the IPv4 prefix. The
>     specifications of SR extensions to ISIS, OSPFv2, OSPFv3, and BGP
>     treat IPv4 and IPv6 prefixes separately, including the IPV6
>     prefixes with embedded IPv4 ones. Besides not all IPv6 prefixes
>     embed IPv4 prefix in them. Hence the distinction between IPv4 and
>     IPv6 prefixes is quite clear
>
>     */[[Sasha]] My concern was mainly about IPv4-mapped IPv6
>     addresses. Quoting from RFC 4291:/*
>
>
>               *2.5.5.2*
>               <https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_rfc4291-23section-2D2.5.5.2&d=DwMGaQ&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&s=I14XA8I9Ruw5aBj5er_OVbvADz1sb9ZLFBGaZZlJJJ4&e=>*. 
>               IPv4-Mapped IPv6 Address*
>
>        A second type of IPv6 address that holds an embedded IPv4
>     address is
>
>        defined. This address type is used to represent the addresses of
>
>     IPv4 nodes as IPv6 addresses.
>
>     *//*
>
>     */From my POV this means that a /128 prefix associated with an
>     IPv4-mapped IPv6 address and a /32 prefix associated with the IPv4
>     address that was mapped to this IPv6 address represent the same
>     entity. This understanding fully matches usage of IPv4-mapped IPv6
>     addresses as BGP Next Hops of VPN-IPv6 addresses defined in RFC
>     4798. However, the comparison rules you have defined will treat
>     them as two different prefixes.  I wonder if these rules, in the
>     case of a conflict, could result in preferring the IPv6 prefix to
>     an IPv4 one and therefore loosing MPLS connectivity for the
>     ingress PE of a 6VPE service to its egress PE?/*
>
>         f.Section 2.5.1 defines 3 types of SR-MPLS FECs, but I am not
>         sure all SID types defined in the Segment Routing Architecture
>         draft can be unambiguously mapped to one of these types.
>         Problematic examples include at least the following:
>
>         i.Parallel Adjacency SID
>
>         ii.Mirror SID
>
>         Explicit mapping of SID types to SR-MPLS FEC types would be
>         most useful IMO. If some SID types cannot be mapped to SR-MPLS
>         FECs, this must be explicitly stated in the draft.
>
>     #Ahmed:
>     Parallel adjacency SID are handled in the type "(next-hop,
>     outgoing interface)"
>
>     */[[Sasha]] OK/*
>
>
>     Mirror SID is a type of binding-SID as mentioned in Section 5.1 in
>     the SR architecture draft (draft-ietf-spring-segment-routing-15).
>     Also as described in Section 2.4
>     draft-ietf-isis-segment-routing-extensions-18 (also see the
>     equivalent in the OSPFv2 and OSPFv3 draft), a binding SID is
>     identified by a prefix. Hence it is covered by the type "(Prefix,
>     Routing Instance, Topology, Algorithm)"
>
>     */[[Sasha]] I respectfully disagree. There is definitely no
>     mention of Algorithm in the definition of the Mirror SID. /*
>
>         6.*Node SIDs in SR-MPLS*:
>
>         a.Node SIDs are explicitly defined and discussed in the
>         Segment Routing Architecture draft but are not mentioned even
>         once in this draft
>
>         b.AFAIK, the common implementation practice today includes
>         assignment of at least one Node SID to every node in the
>         SR-MPLS domain
>
>         c.Is there a requirement to assign at least one Node SID per
>         {routing instance, topology, algorithm} in SR-MPLS? If not,
>         can the authors explain expected behavior of such a node? (See
>         also my comment about routing instances below).
>
>     #Ahmed: A Node-SID is a special case of prefix-SID. So there
>     nothing specific about it from the MPLS forwarding plane point of
>     view. Similarly from a standard tracks draft point of view, there
>     is no requirement to assign a SID to every prefix just like there
>     is no requirement to bind every prefix to an LDP label. Common
>     and/or recommended practices or description of deployment
>     scenarios are more befitting to BCP or informational drafts. This
>     draft is a standards track draft
>
>     */[[Sasha]] Well, you’ve just said that conflict resolution rules
>     are RECOMMENDED, and this is quite common in the Standards Track
>     RFCs. /*
>
>
>     If a {routing instance, topology, algorithm} is not assigned a
>     SID, then this FEC is totally irrelavant to this draft and hence
>     describing how a node treats it is totally outside the scope of
>     this draft
>
>     */[[Sasha]] AFAIK, neither of the SR extension drafts for IGPs
>     mention routing instances that can be associated with the prefix,
>     so I think that your reference to it is incorrect./*
>
>     */What’s more I suspect that Node SIDs represent the most used
>     special case of Prefix SIDs with Anycast SIDs being quite behind.
>      Therefore some recommendation pertaining to the usage of Node
>     SIDs would be very much in place IMHO. /*
>
>         7.*SRGB Size in SR-MPLS*:
>
>         a.The draft correctly treats the situation when an index
>         assigned to some global SID cannot be mapped to a label using
>         the procedure in Section 2.4 as a conflict.
>
>         b.At the same time the draft does not define any minimum size
>         of SRGB (be it defined as a single contiguous block or as a
>         sequence of such blocks) that MUST be implemented by all
>         SR-capable nodes
>
>         c.I suspect that lack of such a definition could be
>         detrimental to interoperability of SR-MPLS solutions. AFAIK,
>         the IETF has been following, for quite some time, a policy
>         that some reasonable MUST-to-implement defaults should be
>         assigned for all configurable parameters exactly in order to
>         prevent this.
>
>     #Ahmed: This document specifies how the SRGB is used and the
>     behavior of routers when a prefix-SID index maps to a label inside
>     and/or outside the SRGB. The actual size of the SRGB is a task in
>     partitioning the label space, which is very specific to a
>     particular deployment scenario. So IMO it is outside the scope of
>     a standards track document. Now that SR-MPLS is deployed in many
>     places, I expect the community to gain sufficient experience to
>     recommend (or not recommend) a particular minimum/maximum size for
>     the SRGB is some future informational or BCP draft/RFC
>
>     */[[Sasha]] My reading of your response is that minimum size of
>     SRGB is an issue for future study. Can you please just add this to
>     the draft?/*
>
>         8.*Algorithms and Prefix SIDs*:
>
>         a.The draft mentions Algorithms (as part of SR-MPLS Prefix
>         FEC) in, but it does not explicitly link them with the
>         Prefix-SID algorithms defined in section 3.1.1 of the Segment
>         Routing Architecture draft
>
>     #Ahmed: I will just add the reference
>     [I-D.ietf-spring-segment-routing] right beside the first time
>     "Algorithm" is mentioned
>
>     */[[Sasha]] OK/*
>
>         b.From my POV, the draft should explicitly state that the
>         default Prefix-SID algorithm MUST be implemented in all
>         SR-MPLS-compliant routers.
>
>     #Ahmed: The specification of what path calculation method should
>     or must be supported is a routing protocol property not a
>     forwarding plane property. In fact, the choice of a path
>     calculation method or algorithm is completely orthogonal to the
>     routed protocol. Hence mandating the support of a particular
>     routing algorithm is beyond the scope of this document.
>
>     */[[Sasha]] OK/*
>
>         c.The Segment Routing Architecture draft states (in section
>         3.1.3) that “Support of multiple algorithms applies to SRv6”.
>         But neither draft states whether multiple algorithms apply to
>         SR-MPLS. Can you please clarify this point?
>
>     #Ahmed: The last paragraph of Section 3.1.2 titled SR-MPLS in
>     draft-ietf-spring-segment-routing-15 discusses the support of
>     multiple algorithms. So it is implied that the concept of
>     algorithm applies to SR-MPLS. Hence there is no need to re-mention
>     it here
>
>     */[[Sasha]] The paragraph to which you refer only says that if a
>     packet with the active Prefix-SID that is associated with a
>     specific algorithm is received by a node that does not support
>     this algorithm, this packet will be discarded. If this is the only
>     type of support for multiple algorithms SR provides, it is not
>     very useful IMHO/**/. /*
>
>         9.*Routing instances and the context for Prefix-SIDs*:
>
>         a.The Segment Routing Architecture draft states in Section 3.1
>         that the “context for an IGP-Prefix segment includes the
>         prefix, topology, and algorithm”
>
>         b.This draft seems to define (in section 2.5) the context for
>         the Prefix SID as “Prefix, Routing Instance, Topology,
>         Algorithm” where ”a routing instance is identified by a single
>         incoming label downloader to FIB” (but the notion of the label
>         downloader to FIB is not defined).
>
>         c.These two definitions look different to me.
>
>         d.At the very least I would expect alignment between the
>         definitions of context for the Prefix-SID between the two
>         drafts. Preferably, the definition given in the Segment
>         Routing Architecture draft should be used in both drafts.
>
>     #Ahmed: The context of the section 2.5 is limited to the
>     resolution of local label collision. The use of "routing instance"
>     in section 2.5 is just there for tie-breaking if there is local
>     label collision.
>
>     */[[Sasha]] I have already mentioned that “routing instances” are
>     not defined in any the drafts dealing with SR Extensions for IGPs.
>     So I do not understand how the conflict resolution procedure is
>     supposed to use this. And in any case the difference between two
>     definitions of the context of Prefix-SID requires some explanation./*
>
>
>
>         10.*Example of PUSH operation in Section 2.10.1*:
>
>         a.The first para of this section begins with the sentence
>         “Suppose an MCC on a router "R0" determines that PUSH or
>         CONTINUE   operation is to be applied to an incoming packet
>         whose active SID is the global SID "Si"”. In the context of
>         SR-MPLS this means (to me) that the incoming packet is a
>         labeled packet and its top label matches the global SID “Si”.
>
>         b.However, the example for PUSH operation in the next para of
>         this section is the case of an (unlabeled) IP packet with the
>         destination address covered by the IP prefix for which “Si”
>         has been assigned.
>
>         c.From my POV:
>
>         i.Mapping unlabeled packets to SIDs is indeed out of scope of
>         the draft. Therefore an example of a PUSH operation that is
>         applied to a labeled packet (with the active SID inferred from
>         the top label in the stack) is preferable.
>
>         ii.Valid examples of  PUSH operation applied to a labeled
>         incoming packet can be found in Sections 4.2 or 4.3 of the
>         TI-LFA
>         <https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_draft-2Dbashandy-2Drtgwg-2Dsegment-2Drouting-2Dti-2Dlfa-2D04&d=DwMGaQ&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&s=jbH0DSYYo2UYymWZrlvAt7qUWVXsYKuCtMiEyoe-DWE&e=>
>         draft
>
>     #Ahmed: I do not understand your concern here:)
>
>     */[[Sasha]] I think it is pretty clear: can you provide an example
>     of a PUSH operation applied to a labeled packet instead of your
>     current example?/*
>
>         *Nits*:
>
>         1.I concur with Adrian regarding numerous nits he has reported
>         in his WG LC Comment
>         <https://urldefense.proofpoint.com/v2/url?u=https-3A__mailarchive.ietf.org_arch_msg_spring_FRhO2lgR8r4VlKP2ZN2dZwHU5BY&d=DwMGaQ&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&s=I_4gDFhcjR_1npqKUQDHThsejUMgJy3WlLzC90poR1w&e=>.
>         I would like to thank Adrian for an excellent review that have
>         saved me lots of hard work.
>
>     #Ahmed: I also agree that Adrian's review is exceptional. I
>     believe I addressed all his comments in the latest version.
>
>         2.In addition, I’d like to report the following nits:
>
>         a.Ti-LFA in Section 2.11.1 should be TI-LFA (as in the TI-LFA
>         <https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_draft-2Dbashandy-2Drtgwg-2Dsegment-2Drouting-2Dti-2Dlfa-2D04&d=DwMGaQ&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&s=jbH0DSYYo2UYymWZrlvAt7qUWVXsYKuCtMiEyoe-DWE&e=>
>         draft)
>
>     #Ahmed: Already done in the latest version*/[[Sasha]] OK/*
>
>         b.TI-LFA draft is referenced in the text of Section 2.11.1,
>         but there is no matching reference in the “References” section
>         (probably, Informational)
>
>     #Ahmed: Already done in the latest version*/[[Sasha]] OK/*
>
>         c.“zero Algorithm” in Section 2.5 (immediately above Section
>         2.5.1) must be replaced with “default algorithm”. Similarly,
>         “non-zero Algorithm” should be replaced with “non-default
>         algorithm”
>
>     #Ahmed: Will be done in the next version*/[[Sasha]] /* OK
>
>         3.I think that RFC 3443 and RFC 5332 should be listed as
>         Normative references in this draft while RFC 5331 and RFC 8277
>         should be listed as Informative references. This would improve
>         the readability of the draft without any impact on its
>         advancement.
>
>     #Ahmed RFC5331 describes upstream label assignment. As you
>     mentioned above (and I will modify the draft to indicate that)
>     SR-MPLS behavior is similar to downstream label assignment. RFC
>     3443 describes TTL behavior. This is an MPLS forwarding behavior.
>     As mentioned in the draft, SR-MPLS does not modify at the MPLS
>     forwarding behavior
>
>     */[[Sasha]] Regarding RFC 5331 – you may skip this reference if
>     you state (as discussed below) that SR-MPLS only allocates labels
>     from the per-platform label space. Regarding RFC 3443 – I do not
>     think that you can fully avoid discussion of Uniform and
>     Pipe/Short Pipe models, and therefore you will need this reference./*
>
>
>
>         Hopefully, these comments will be useful.
>
>     #Ahmed: They are certainly quite useful. Thanks a lot
>
>         Regards,
>
>         Sasha
>
>         Office: +972-39266302
>
>         Cell:      +972-549266302
>
>         Email: Alexander.Vainshtein@ecitele.com
>         <mailto:Alexander.Vainshtein@ecitele.com>
>
>
>         ___________________________________________________________________________
>
>         This e-mail message is intended for the recipient only and
>         contains information which is
>         CONFIDENTIAL and which may be proprietary to ECI Telecom. If
>         you have received this
>         transmission in error, please inform us by e-mail, phone or
>         fax, and then delete the original
>         and all copies thereof.
>         ___________________________________________________________________________
>
>
>     ___________________________________________________________________________
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>     This e-mail message is intended for the recipient only and
>     contains information which is
>     CONFIDENTIAL and which may be proprietary to ECI Telecom. If you
>     have received this
>     transmission in error, please inform us by e-mail, phone or fax,
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> This e-mail message is intended for the recipient only and contains 
> information which is
> CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have 
> received this
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    <p>Thanks for the comments</p>
    <p>While it is a clear violation of the SR architecture RFC (8402),
      more than one node advertising the same IPv4/6 PREFIX and both
      have the same prefix-SID value with "N" flag is not an incoming
      label collision because the label is associated with the same FEC,
      which is the prefix.  <br>
    </p>
    <p>Hence handling such violation is not an SR-MPLS problem because
      there is no incoming label collision and hence it it is outside
      the scope of this draft<br>
    </p>
    <p><br>
    </p>
    <p>The second issue is which SID to choose for an SR-policy (be it a
      policy for TE, ti-lfa, uloop avoidance, security,..., etc). That
      is strictly a control layer functionality and is not specific to
      SR-MPLS. Hence it is outside the scope of this draft</p>
    <p><br>
    </p>
    <p>The third issue is the case where an anycast prefix is advertised
      with a prefix-SID sub-TLV by some (but not all) of the nodes that
      advertise that prefix. Again this is not an incoming label
      collision because the label is associated with a single FEC, which
      is the anycast prefix.<br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 7/19/18 8:30 PM, Shraddha Hegde
      wrote:<br>
    </div>
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      <div class="WordSection1">
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Hi
            Ahmed,<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">The
            Node-SIDs are expected to be unique to a node.
            <o:p></o:p></span></p>
        <pre><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">“</span><o:p></o:p></pre>
        <p class="MsoNormal"
          style="margin:0in;margin-bottom:.0001pt;line-height:normal">
          <span style="font-size:10.0pt;color:windowtext">   An IGP
            Node-SID MUST NOT be associated with a prefix that is owned
            by<o:p></o:p></span></p>
        <p class="MsoNormal"
          style="margin:0in;margin-bottom:.0001pt;line-height:normal">
          <span style="font-size:10.0pt;color:windowtext">   more than
            one router within the same routing domain.”<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">If
            two different nodes advertise same Node-SID,<o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">        
            For Example Node A and B both advertise prefix 1.1.1.1 and
            associate a  SID 1000 with N bit set.<o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">There
            is an anomaly here and IMO, this draft should address how to
            handle this anomaly and whether TI-LFA and other<o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Applications
            can use this SID as a Node-SID.<o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Another
            slight variation of this case is a scenario where A and B
            both advertise a prefix 1.1.1.1 and A assigns a Node-Sid<o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Of
            1000 and B does not assign any SID.<o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p> </o:p></span></p>
        <p class="MsoNormal" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Rgds<o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Shraddha<o:p></o:p></span></p>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p> </o:p></span></p>
        <div>
          <div style="border:none;border-top:solid #E1E1E1
            1.0pt;padding:3.0pt 0in 0in 0in">
            <p class="MsoNormal"
              style="margin:0in;margin-bottom:.0001pt;line-height:normal">
              <b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">From:</span></b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">
                Alexander Vainshtein
                <a class="moz-txt-link-rfc2396E" href="mailto:Alexander.Vainshtein@ecitele.com">&lt;Alexander.Vainshtein@ecitele.com&gt;</a>
                <br>
                <b>Sent:</b> Thursday, July 19, 2018 10:05 PM<br>
                <b>To:</b> Ahmed Bashandy
                <a class="moz-txt-link-rfc2396E" href="mailto:abashandy.ietf@gmail.com">&lt;abashandy.ietf@gmail.com&gt;</a><br>
                <b>Cc:</b> <a class="moz-txt-link-abbreviated" href="mailto:rtg-dir@ietf.org">rtg-dir@ietf.org</a>; '<a class="moz-txt-link-abbreviated" href="mailto:mpls@ietf.org">mpls@ietf.org</a>'
                <a class="moz-txt-link-rfc2396E" href="mailto:mpls@ietf.org">&lt;mpls@ietf.org&gt;</a>; '<a class="moz-txt-link-abbreviated" href="mailto:adrian@olddog.co.uk">adrian@olddog.co.uk</a>'
                <a class="moz-txt-link-rfc2396E" href="mailto:adrian@olddog.co.uk">&lt;adrian@olddog.co.uk&gt;</a>; Jonathan Hardwick
                (<a class="moz-txt-link-abbreviated" href="mailto:Jonathan.Hardwick@metaswitch.com">Jonathan.Hardwick@metaswitch.com</a>)
                <a class="moz-txt-link-rfc2396E" href="mailto:jonathan.hardwick@metaswitch.com">&lt;jonathan.hardwick@metaswitch.com&gt;</a>; Shraddha Hegde
                <a class="moz-txt-link-rfc2396E" href="mailto:shraddha@juniper.net">&lt;shraddha@juniper.net&gt;</a>; <a class="moz-txt-link-abbreviated" href="mailto:spring@ietf.org">spring@ietf.org</a>;
                <a class="moz-txt-link-abbreviated" href="mailto:spring-chairs@ietf.org">spring-chairs@ietf.org</a>;
                <a class="moz-txt-link-abbreviated" href="mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org">draft-ietf-spring-segment-routing-mpls.authors@ietf.org</a><br>
                <b>Subject:</b> RE: RtgDir Early review:
                draft-ietf-spring-segment-routing-mpls-13<o:p></o:p></span></p>
          </div>
        </div>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Ahmed
            hi!<o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Lots
            of thanks for your response.<o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Of
            course Node SIDs are not different from any other Prefix
            SIDs when it comes to the MPLS forwarding plane.<o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">But,
            IMHO, strictly speaking, this is correct for any other SID
            as well.
            <o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">You
            seem to ignore the difference between SR-MPLS and SRv6 with
            regard to the life span of prefix SIDs in general and Node
            SIDs in particular. From my POV this difference should be
            discussed in the draft. <o:p></o:p></span></p>
        <p class="MsoNormal" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">So
            it seems that we can only “agree to disagree” on the need to
            say something specific about Node SIDs in the draft, and let
            the WG to decide what to do about it. <o:p></o:p></span></p>
        <div>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Regards,<o:p></o:p></span></p>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Sasha<o:p></o:p></span></p>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p> </o:p></span></p>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Office:
              +972-39266302<o:p></o:p></span></p>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Cell:     
              +972-549266302<o:p></o:p></span></p>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Email:  
              <a href="mailto:Alexander.Vainshtein@ecitele.com"
                moz-do-not-send="true">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></span></p>
        </div>
        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"><o:p> </o:p></span></p>
        <div>
          <div style="border:none;border-top:solid #E1E1E1
            1.0pt;padding:3.0pt 0in 0in 0in">
            <p class="MsoNormal"
              style="margin:0in;margin-bottom:.0001pt;line-height:normal">
              <b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">From:</span></b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">
                Ahmed Bashandy [<a
                  href="mailto:abashandy.ietf@gmail.com"
                  moz-do-not-send="true">mailto:abashandy.ietf@gmail.com</a>]
                <br>
                <b>Sent:</b> Thursday, July 19, 2018 7:13 PM<br>
                <b>To:</b> Alexander Vainshtein &lt;<a
                  href="mailto:Alexander.Vainshtein@ecitele.com"
                  moz-do-not-send="true">Alexander.Vainshtein@ecitele.com</a>&gt;<br>
                <b>Cc:</b> <a href="mailto:rtg-dir@ietf.org"
                  moz-do-not-send="true">rtg-dir@ietf.org</a>;
                '<a class="moz-txt-link-abbreviated" href="mailto:mpls@ietf.org">mpls@ietf.org</a>' &lt;<a href="mailto:mpls@ietf.org"
                  moz-do-not-send="true">mpls@ietf.org</a>&gt;;
                '<a class="moz-txt-link-abbreviated" href="mailto:adrian@olddog.co.uk">adrian@olddog.co.uk</a>' &lt;<a
                  href="mailto:adrian@olddog.co.uk"
                  moz-do-not-send="true">adrian@olddog.co.uk</a>&gt;;
                Jonathan Hardwick (<a
                  href="mailto:Jonathan.Hardwick@metaswitch.com"
                  moz-do-not-send="true">Jonathan.Hardwick@metaswitch.com</a>)
                &lt;<a href="mailto:jonathan.hardwick@metaswitch.com"
                  moz-do-not-send="true">jonathan.hardwick@metaswitch.com</a>&gt;;
                <a href="mailto:shraddha@juniper.net"
                  moz-do-not-send="true">shraddha@juniper.net</a>; <a
                  href="mailto:spring@ietf.org" moz-do-not-send="true">
                  spring@ietf.org</a>; <a
                  href="mailto:spring-chairs@ietf.org"
                  moz-do-not-send="true">spring-chairs@ietf.org</a>;
                <a
                  href="mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org"
                  moz-do-not-send="true">draft-ietf-spring-segment-routing-mpls.authors@ietf.org</a><br>
                <b>Subject:</b> Re: RtgDir Early review:
                draft-ietf-spring-segment-routing-mpls-13<o:p></o:p></span></p>
          </div>
        </div>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p>Thanks for the reply<o:p></o:p></p>
        <p>See inline<o:p></o:p></p>
        <p>Ahmed<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <div>
          <p class="MsoNormal">On 7/12/18 12:22 AM, Alexander Vainshtein
            wrote:<o:p></o:p></p>
        </div>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <p class="MsoNormal" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Ahmed
              and all,</span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">I
              would like to expand on my comments (and your responses)
              about the role of Node SIDs in SR-MPLS.</span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">I
              would like to bring your attention two points:</span><o:p></o:p></p>
          <p class="MsoListParagraph"
            style="text-indent:-.25in;mso-list:l2 level1 lfo4"><!--[if !supportLists]--><span
              style="mso-list:Ignore">1.<span style="font:7.0pt
                &quot;Times New Roman&quot;">      
              </span></span><!--[endif]--><span style="color:#1F497D">Node
              SIDs (and, in general, Prefix SIDs) in MPLS-SR are
              different from the same in SRv6 because they require
              explicit configuration action by the operator of SR
              domain. I.e., it is not enough for a node to own some /32
              or /128 prefix that is advertised by IGP. The operator
              must explicitly configure the node to use such a prefix
              as  Node SID and to assign to it a specific index that is
              unique in the SR domain. From my POV, this difference
              alone would qualify Node SIDs as a topic to be discussed
              in the <a
href="https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_draft-2Dietf-2Dspring-2Dsegment-2Drouting-2Dmpls-2D14&amp;d=DwMGaQ&amp;c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&amp;m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&amp;s=q6djpRXlamUzKZlGIuXTtBcsnwevHwddqvStZrSFMnE&amp;e="
                moz-do-not-send="true">
                MPLS-SR Architecture</a> draft.</span><o:p></o:p></p>
        </blockquote>
        <p class="MsoNormal" style="margin-left:0in;line-height:normal"><span
            style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
            I disagree with your POV. From the forwarding plane
            perspective it does not make any difference whether a the
            label at the top of an MPLS packet (representing the
            prefix-SID) identifies a node or not. So from the SR-mpls
            forwarding point of view there is no difference between a
            prefix-SID and a node-SID. If there is any place in the
            SR-mpls draft where there is a need to handle a node-SID
            different from a prefix SID, it would be great to point it
            out<br>
            <br>
            <o:p></o:p></span></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <h3
style="margin-left:.5in;text-indent:-.25in;mso-line-height-alt:0pt;mso-list:l2
            level1 lfo4">
            <!--[if !supportLists]--><span style="mso-list:Ignore">2.<span
                style="font:7.0pt &quot;Times New Roman&quot;">     
              </span></span><!--[endif]-->In addition, quite a few
            constructs associated with SR-MPLS implicitly assume that
            each node in the SR-MPLS domain is assigned with at least
            one Node SID. One example can be found in the
            <a
href="https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_draft-2Dbashandy-2Drtgwg-2Dsegment-2Drouting-2Dti-2Dlfa-2D04&amp;d=DwMGaQ&amp;c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&amp;m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&amp;s=jbH0DSYYo2UYymWZrlvAt7qUWVXsYKuCtMiEyoe-DWE&amp;e="
              moz-do-not-send="true">
              <span style="font-family:&quot;Calibri&quot;,sans-serif">TI-LFA</span></a>
            draft. This draft says in Section 4.2:<o:p></o:p></h3>
          <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"> </span><o:p></o:p></p>
          <h3 style="margin-left:1.0in;mso-line-height-alt:0pt"><a
href="https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_draft-2Dbashandy-2Drtgwg-2Dsegment-2Drouting-2Dti-2Dlfa-2D04-23section-2D4.2&amp;d=DwMGaQ&amp;c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&amp;m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&amp;s=sAi3KCWUwGS3D93t8ic64W_46xm9y8Oacs7ozcAweS8&amp;e="
              moz-do-not-send="true"><span
                style="font-size:10.0pt;font-family:&quot;Courier New
                \;color\:black&quot;">4.2</span></a><a
              name="section-4.2" moz-do-not-send="true"></a><span
              style="font-size:10.0pt;font-family:&quot;Courier New
              \;color\:black&quot;">. The repair node is a PQ node</span><o:p></o:p></h3>
          <pre style="margin-left:.7in"><span style="color:black"> </span><o:p></o:p></pre>
          <pre style="margin-left:.7in"><span style="color:black"> </span><o:p></o:p></pre>
          <pre style="margin-left:.7in"><span style="color:black">   When the repair node is in P(S,X), the repair list is made of a</span><o:p></o:p></pre>
          <pre style="margin-left:.7in"><span style="color:black">   single node segment to the repair node.</span><o:p></o:p></pre>
          <div>
            <p class="MsoNormal"
style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:0in;margin-left:.5in;margin-bottom:.0001pt;line-height:normal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">In
                the scope of this section, the repair node is not
                adjacent to the PLR, and therefore, to the best of my
                understanding,  “a single
                <span style="background:yellow;mso-highlight:yellow">node
                  segment</span> to the repair node” can be only the
                Node SID of the repair node. Since repair nodes are
                computed dynamically, this entire scheme depends on all
                nodes in the MPLS=SR domain  having at least one Node
                SID each</span><o:p></o:p></p>
          </div>
        </blockquote>
        <p class="MsoNormal" style="margin-left:0in;line-height:normal"><span
            style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
            The choice of the SID to identify an intermediate or exit
            node(s) in an SR-policy is a control plane behavior,
            irrespective of reason such policy is created (be it ti-lfa
            explicit path, uloop avoidance explicit path, or some SR-TE
            explicit path). SR-Policy as well as Ti-LFA and uloop
            avoidance are handled in separate drafts. So just like the
            response to your previous comment, from forwarding plane
            perspective it does not make any difference whether the
            label at the top of an MPLS packet identifies a single or
            multiple nodes.
            <br>
            <br>
            <o:p></o:p></span></p>
        <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
          <div>
            <p class="MsoNormal"
style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:0in;margin-left:.5in;margin-bottom:.0001pt;line-height:normal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">.</span><o:p></o:p></p>
            <p class="MsoNormal"
              style="margin:0in;margin-bottom:.0001pt;line-height:normal">
              <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"> </span><o:p></o:p></p>
            <p class="MsoNormal"
              style="margin:0in;margin-bottom:.0001pt;line-height:normal">
              <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Hopefully
                these notes clarify my position on the subject.</span><o:p></o:p></p>
            <p class="MsoNormal"
              style="margin:0in;margin-bottom:.0001pt;line-height:normal">
              <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"> </span><o:p></o:p></p>
            <p class="MsoNormal"
              style="margin:0in;margin-bottom:.0001pt;line-height:normal">
              <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Regards,</span><o:p></o:p></p>
            <p class="MsoNormal"
              style="margin:0in;margin-bottom:.0001pt;line-height:normal">
              <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Sasha</span><o:p></o:p></p>
            <p class="MsoNormal"
              style="margin:0in;margin-bottom:.0001pt;line-height:normal">
              <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"> </span><o:p></o:p></p>
            <p class="MsoNormal"
              style="margin:0in;margin-bottom:.0001pt;line-height:normal">
              <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Office:
                +972-39266302</span><o:p></o:p></p>
            <p class="MsoNormal"
              style="margin:0in;margin-bottom:.0001pt;line-height:normal">
              <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Cell:     
                +972-549266302</span><o:p></o:p></p>
            <p class="MsoNormal"
              style="margin:0in;margin-bottom:.0001pt;line-height:normal">
              <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Email:  
                <a href="mailto:Alexander.Vainshtein@ecitele.com"
                  moz-do-not-send="true">Alexander.Vainshtein@ecitele.com</a></span><o:p></o:p></p>
          </div>
          <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"> </span><o:p></o:p></p>
          <div>
            <div style="border:none;border-top:solid #E1E1E1
              1.0pt;padding:3.0pt 0in 0in 0in">
              <p class="MsoNormal"
                style="margin:0in;margin-bottom:.0001pt;line-height:normal">
                <b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">From:</span></b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">
                  Alexander Vainshtein
                  <br>
                  <b>Sent:</b> Wednesday, July 11, 2018 12:02 PM<br>
                  <b>To:</b> Ahmed Bashandy <a
                    href="mailto:abashandy.ietf@gmail.com"
                    moz-do-not-send="true">&lt;abashandy.ietf@gmail.com&gt;</a><br>
                  <b>Cc:</b> <a href="mailto:rtg-dir@ietf.org"
                    moz-do-not-send="true">rtg-dir@ietf.org</a>; '<a
                    href="mailto:mpls@ietf.org" moz-do-not-send="true">mpls@ietf.org</a>'
                  <a href="mailto:mpls@ietf.org" moz-do-not-send="true">&lt;mpls@ietf.org&gt;</a>;
                  '<a href="mailto:adrian@olddog.co.uk"
                    moz-do-not-send="true">adrian@olddog.co.uk</a>'
                  <a href="mailto:adrian@olddog.co.uk"
                    moz-do-not-send="true">&lt;adrian@olddog.co.uk&gt;</a>;
                  Jonathan Hardwick (<a
                    href="mailto:Jonathan.Hardwick@metaswitch.com"
                    moz-do-not-send="true">Jonathan.Hardwick@metaswitch.com</a>)
                  <a href="mailto:jonathan.hardwick@metaswitch.com"
                    moz-do-not-send="true">&lt;jonathan.hardwick@metaswitch.com&gt;</a>;
                  <a href="mailto:shraddha@juniper.net"
                    moz-do-not-send="true">shraddha@juniper.net</a>; <a
                    href="mailto:spring@ietf.org" moz-do-not-send="true">
                    spring@ietf.org</a>; <a
                    href="mailto:spring-chairs@ietf.org"
                    moz-do-not-send="true">spring-chairs@ietf.org</a>;
                  <a
                    href="mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org"
                    moz-do-not-send="true">draft-ietf-spring-segment-routing-mpls.authors@ietf.org</a><br>
                  <b>Subject:</b> RE: RtgDir Early review:
                  draft-ietf-spring-segment-routing-mpls-13</span><o:p></o:p></p>
            </div>
          </div>
          <p class="MsoNormal"> <o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Ahmed,
              and all,</span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Lots
              of thanks for a detailed response to my comments.
            </span><o:p></o:p></p>
          <p class="MsoNormal" style="margin-left:0in"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Please
              see
            </span><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">inline
                  below</span></i></b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">
              my position on each of them.</span><o:p></o:p></p>
          <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"> </span><o:p></o:p></p>
          <div>
            <p class="MsoNormal"
              style="margin:0in;margin-bottom:.0001pt;line-height:normal">
              <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Regards,</span><o:p></o:p></p>
            <p class="MsoNormal"
              style="margin:0in;margin-bottom:.0001pt;line-height:normal">
              <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Sasha</span><o:p></o:p></p>
            <p class="MsoNormal"
              style="margin:0in;margin-bottom:.0001pt;line-height:normal">
              <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"> </span><o:p></o:p></p>
            <p class="MsoNormal"
              style="margin:0in;margin-bottom:.0001pt;line-height:normal">
              <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Office:
                +972-39266302</span><o:p></o:p></p>
            <p class="MsoNormal"
              style="margin:0in;margin-bottom:.0001pt;line-height:normal">
              <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Cell:     
                +972-549266302</span><o:p></o:p></p>
            <p class="MsoNormal"
              style="margin:0in;margin-bottom:.0001pt;line-height:normal">
              <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Email:  
                <a href="mailto:Alexander.Vainshtein@ecitele.com"
                  moz-do-not-send="true">Alexander.Vainshtein@ecitele.com</a></span><o:p></o:p></p>
          </div>
          <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"> </span><o:p></o:p></p>
          <div>
            <div style="border:none;border-top:solid #E1E1E1
              1.0pt;padding:3.0pt 0in 0in 0in">
              <p class="MsoNormal"
                style="margin:0in;margin-bottom:.0001pt;line-height:normal">
                <b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">From:</span></b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:windowtext">
                  Ahmed Bashandy [<a
                    href="mailto:abashandy.ietf@gmail.com"
                    moz-do-not-send="true">mailto:abashandy.ietf@gmail.com</a>]
                  <br>
                  <b>Sent:</b> Wednesday, July 11, 2018 4:42 AM<br>
                  <b>To:</b> Alexander Vainshtein &lt;<a
                    href="mailto:Alexander.Vainshtein@ecitele.com"
                    moz-do-not-send="true">Alexander.Vainshtein@ecitele.com</a>&gt;;
                  <a href="mailto:spring-chairs@ietf.org"
                    moz-do-not-send="true">spring-chairs@ietf.org</a>; <a
href="mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org"
                    moz-do-not-send="true">
draft-ietf-spring-segment-routing-mpls.authors@ietf.org</a><br>
                  <b>Cc:</b> <a href="mailto:rtg-dir@ietf.org"
                    moz-do-not-send="true">rtg-dir@ietf.org</a>; '<a
                    href="mailto:mpls@ietf.org" moz-do-not-send="true">mpls@ietf.org</a>'
                  &lt;<a href="mailto:mpls@ietf.org"
                    moz-do-not-send="true">mpls@ietf.org</a>&gt;; '<a
                    href="mailto:adrian@olddog.co.uk"
                    moz-do-not-send="true">adrian@olddog.co.uk</a>' &lt;<a
                    href="mailto:adrian@olddog.co.uk"
                    moz-do-not-send="true">adrian@olddog.co.uk</a>&gt;;
                  Jonathan Hardwick (<a
                    href="mailto:Jonathan.Hardwick@metaswitch.com"
                    moz-do-not-send="true">Jonathan.Hardwick@metaswitch.com</a>)
                  &lt;<a href="mailto:jonathan.hardwick@metaswitch.com"
                    moz-do-not-send="true">jonathan.hardwick@metaswitch.com</a>&gt;;
                  <a href="mailto:shraddha@juniper.net"
                    moz-do-not-send="true">shraddha@juniper.net</a>; <a
                    href="mailto:spring@ietf.org" moz-do-not-send="true">
                    spring@ietf.org</a><br>
                  <b>Subject:</b> Re: RtgDir Early review:
                  draft-ietf-spring-segment-routing-mpls-13</span><o:p></o:p></p>
            </div>
          </div>
          <p class="MsoNormal"> <o:p></o:p></p>
          <p>Thanks for thorough (and VERY clear) the review<o:p></o:p></p>
          <p>See inline #Ahmed<o:p></o:p></p>
          <p> <o:p></o:p></p>
          <p>Ahmed<o:p></o:p></p>
          <p> <o:p></o:p></p>
          <p class="MsoNormal"> <o:p></o:p></p>
          <div>
            <p class="MsoNormal">On 6/15/18 11:08 PM, Alexander
              Vainshtein wrote:<o:p></o:p></p>
          </div>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <p class="MsoNormal"><span
                  style="font-family:&quot;Arial&quot;,sans-serif">Re-sending
                  to  correct SPRING WG list.</span><o:p></o:p></p>
            </div>
            <div>
              <p class="MsoNormal"><span
                  style="font-family:&quot;Arial&quot;,sans-serif">Sincere
                  apologies for the delay caused by a typo.</span><o:p></o:p></p>
            </div>
            <div>
              <div>
                <p class="MsoNormal"
                  style="margin-bottom:0cmmargin-bottom:.0001pt"><span
                    style="font-family:&quot;Arial&quot;,sans-serif">Thumb
                    typed by Sasha Vainshtein</span><o:p></o:p></p>
              </div>
              <p class="MsoNormal"><span
                  style="font-family:&quot;Arial&quot;,sans-serif"> </span><o:p></o:p></p>
            </div>
            <div style="margin-left:.3in;margin-bottom:12.0pt">
              <div class="MsoNormal"
                style="margin:0in;margin-bottom:.0001pt;text-align:center"
                align="center">
                <span style="font-family:&quot;Times New Roman
                  \,serif&quot;">
                  <hr align="center" size="2" width="98%">
                </span></div>
            </div>
            <div id="divRplyFwdMsg">
              <p class="MsoNormal"><b>From:</b> Alexander Vainshtein<br>
                <b>Sent:</b> Sunday, June 10, 2018 10:43:52 AM<br>
                <b>To:</b> <a href="mailto:spring-chairs@ietf.org"
                  moz-do-not-send="true">spring-chairs@ietf.org</a>; <a
href="mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org"
                  moz-do-not-send="true">
draft-ietf-spring-segment-routing-mpls.authors@ietf.org</a><br>
                <b>Cc:</b> <a href="mailto:spring@ietf.com"
                  moz-do-not-send="true">spring@ietf.com</a>; <a
                  href="mailto:rtg-dir@ietf.org" moz-do-not-send="true">
                  rtg-dir@ietf.org</a>; '<a href="mailto:mpls@ietf.org"
                  moz-do-not-send="true">mpls@ietf.org</a>'; '<a
                  href="mailto:adrian@olddog.co.uk"
                  moz-do-not-send="true">adrian@olddog.co.uk</a>';
                Jonathan Hardwick (<a
                  href="mailto:Jonathan.Hardwick@metaswitch.com"
                  moz-do-not-send="true">Jonathan.Hardwick@metaswitch.com</a>);
                <a href="mailto:shraddha@juniper.net"
                  moz-do-not-send="true">shraddha@juniper.net</a><br>
                <b>Subject:</b> RE: RtgDir Early review:
                draft-ietf-spring-segment-routing-mpls-13<span
                  style="font-family:&quot;Times New Roman&quot;,serif">
                </span><o:p></o:p></p>
              <div>
                <p class="MsoNormal"><span
                    style="font-family:&quot;Times New Roman
                    \,serif&quot;"> </span><o:p></o:p></p>
              </div>
            </div>
            <div>
              <div>
                <p class="MsoNormal"><span style="color:#1F497D">Explicitly
                    adding Shraddha  who is the shepherd of this draft.
                  </span><o:p></o:p></p>
                <p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
                <div>
                  <p class="MsoNormal"><span style="color:#1F497D">Regards,</span><o:p></o:p></p>
                  <p class="MsoNormal"><span style="color:#1F497D">Sasha</span><o:p></o:p></p>
                  <p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
                  <p class="MsoNormal"><span style="color:#1F497D">Office:
                      +972-39266302</span><o:p></o:p></p>
                  <p class="MsoNormal"><span style="color:#1F497D">Cell:     
                      +972-549266302</span><o:p></o:p></p>
                  <p class="MsoNormal"><span style="color:#1F497D">Email:  
                      <a href="mailto:Alexander.Vainshtein@ecitele.com"
                        moz-do-not-send="true">
                        Alexander.Vainshtein@ecitele.com</a></span><o:p></o:p></p>
                </div>
                <p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
                <div>
                  <div style="border:none;border-top:solid #E1E1E1
                    1.0pt;padding:3.0pt 0in 0in 0in">
                    <p class="MsoNormal"><b>From:</b> Alexander
                      Vainshtein <br>
                      <b>Sent:</b> Friday, June 8, 2018 5:43 PM<br>
                      <b>To:</b> '<a
                        href="mailto:spring-chairs@ietf.org"
                        moz-do-not-send="true">spring-chairs@ietf.org</a>'
                      <a href="mailto:spring-chairs@ietf.org"
                        moz-do-not-send="true">
                        &lt;spring-chairs@ietf.org&gt;</a>; '<a
                        href="mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org"
                        moz-do-not-send="true">draft-ietf-spring-segment-routing-mpls.authors@ietf.org</a>'
                      <a
                        href="mailto:draft-ietf-spring-segment-routing-mpls.authors@ietf.org"
                        moz-do-not-send="true">&lt;draft-ietf-spring-segment-routing-mpls.authors@ietf.org&gt;</a><br>
                      <b>Cc:</b> '<a href="mailto:spring@ietf.com"
                        moz-do-not-send="true">spring@ietf.com</a>' <a
                        href="mailto:spring@ietf.com"
                        moz-do-not-send="true">
                        &lt;spring@ietf.com&gt;</a>; <a
                        href="mailto:rtg-dir@ietf.org"
                        moz-do-not-send="true">rtg-dir@ietf.org</a>; <a
                        href="mailto:mpls@ietf.org"
                        moz-do-not-send="true">
                        mpls@ietf.org</a>; '<a
                        href="mailto:adrian@olddog.co.uk"
                        moz-do-not-send="true">adrian@olddog.co.uk</a>'
                      <a href="mailto:adrian@olddog.co.uk"
                        moz-do-not-send="true">&lt;adrian@olddog.co.uk&gt;</a><br>
                      <b>Subject:</b> RtgDir Early review:
                      draft-ietf-spring-segment-routing-mpls-13<o:p></o:p></p>
                  </div>
                </div>
                <p class="MsoNormal"> <o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Hello,</span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">I
                    have been selected to do a routing directorate
                    “early” review of this draft:
                    <a
href="https://urldefense.proofpoint.com/v2/url?u=https-3A__datatracker.ietf.org_doc_draft-2Dietf-2Dspring-2Dsegment-2Drouting-2Dmpls_&amp;d=DwMGaQ&amp;c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&amp;m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&amp;s=Cxbaaf9U0kj6_meVSobSkRLQW1SwI8MJvgHpuYp0QOM&amp;e="
                      moz-do-not-send="true">
https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/</a></span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">The
                    routing directorate will, on request from the
                    working group chair, perform an “early” review of a
                    draft before it is submitted for publication to the
                    IESG. The early review can be performed at any time
                    during the draft’s lifetime as a working group
                    document. The purpose of the early review depends on
                    the stage that the document has reached. As this
                    document is currently in the WG Last call, my focus
                    for the review was to determine whether the document
                    is ready to be published. Please consider my
                    comments along with the other working group last
                    call comments.</span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">For
                    more information about the Routing Directorate,
                    please see
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Arial&quot;,sans-serif">​</span><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"><a
href="https://urldefense.proofpoint.com/v2/url?u=http-3A__trac.tools.ietf.org_area_rtg_trac_wiki_RtgDir&amp;d=DwMGaQ&amp;c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&amp;m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&amp;s=6pnI7l82ewwzoxgOXqTKrbKuQidt6-KBsZdsXFnoQCg&amp;e="
                      moz-do-not-send="true">http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir</a>
                  </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><b><span
                      style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Document</span></b><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:
                    draft-ietf-spring-segment-routing-mpls-13</span><o:p></o:p></p>
                <p class="MsoNormal"><b><span
                      style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Reviewer</span></b><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:
                    Alexander (“Sasha”) Vainshtein (<a
                      href="mailto:alexander.vainshtein@ecitele.com"
                      moz-do-not-send="true">alexander.vainshtein@ecitele.com</a>)</span><o:p></o:p></p>
                <p class="MsoNormal"><b><span
                      style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Review
                      Date</span></b><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:
                    08-Jun-18</span><o:p></o:p></p>
                <p class="MsoNormal"><b><span
                      style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Intended
                      Status</span></b><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:
                    Proposed Standard.</span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><b><span
                      style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Summary</span></b><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:</span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">I
                    have some minor concerns about this document that I
                    think should be resolved before it is submitted to
                    the IESG.</span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><b><span
                      style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Comments</span></b><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:</span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">I
                    consider this draft as an important  companion
                    document to the
                    <a
href="https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_draft-2Dietf-2Dspring-2Dsegment-2Drouting-2D15&amp;d=DwMGaQ&amp;c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&amp;m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&amp;s=iJShh7e7yyVkt44v1O5pyCOMfHCpAvfBNGgFr5lk130&amp;e="
                      moz-do-not-send="true">
                      Segment Routing Architecture</a> draft that,
                    ideally, should augment definitions of the Segment
                    Routing (SR) notions and constructs given there with
                    details specific for the SR instantiation that uses 
                    the MPLS data plane (SR-MPLS).  Many issues raised
                    in my review reflect either gaps that should be, but
                    have not been, closed, or inconsistencies between
                    the two drafts.
                  </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Since
                    <a
href="https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_rfc8287&amp;d=DwMGaQ&amp;c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&amp;m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&amp;s=y7jp3UYNTtcmm9HOulzqPTrMURTrsMiO26rWlNZN5Ws&amp;e="
                      moz-do-not-send="true">
                      RFC 8287</a> is already published as a Standards
                    Track RFC, I expect such augmentation to be backward
                    compatible with this document (or to provide clear
                    indications of required updates to this document).
                    And I include the MPLS WG into distribution list.
                  </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">This
                    draft was not easy reading for me. In particular,
                    the style of Section 2.5 that discusses at length
                    and in some detail multiple “corner cases”
                    resulting, presumably, from misconfiguration, before
                    it explains the basic (and relatively simple)
                    “normal” behavior, looks problematic to me.</span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">The
                    WG Last Call has been extended by one week.
                    Nevertheless, I am sending out my comments
                  </span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><b><span
                      style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Major
                      Issues</span></b><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:
                    None found</span><o:p></o:p></p>
              </div>
            </div>
          </blockquote>
          <p class="MsoNormal"><span style="font-family:&quot;Times New
              Roman \,serif&quot;">#Ahmed: thanks a lot</span><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <div>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoNormal"><b><span
                      style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Minor
                      Issues</span></b><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:
                    Quite a few but, hopefully, easy to resolve.</span><o:p></o:p></p>
                <p class="MsoNormal"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
                <p class="MsoListParagraph" style="text-indent:-.25in"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">1.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><b><span
                      style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Encapsulation
                      of SR-MPLS packets</span></b><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:
                  </span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.0in;text-indent:-.25in"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">a.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">RFC
                    3032 (referenced by the draft) and RFC 5332 (<b><i>not
                        mentioned in the draft</i></b>) depend two
                    encapsulations of labeled packets - one for
                    Downstream-allocated labels and another for
                    Upstream-allocated ones.</span><o:p></o:p></p>
              </div>
            </div>
          </blockquote>
          <p class="MsoNormal"><span style="font-family:&quot;Times New
              Roman \,serif&quot;">#Ahmed: RFC5332 is for multicast. As
              mentioned in Section 6 of
              draft-ietf-spring-segment-routing-15, multicast is outside
              the scope of SR. Hence the RFC was not referred to in the
              SR-MPLS draft</span><o:p></o:p></p>
          <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                  I would be satisfied with this response, would it not
                  be for the following text I see in Section 2.2 of the</span></i></b><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">
                  <a
href="https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_draft-2Dietf-2Dspring-2Dsegment-2Drouting-2Dpolicy-2D01&amp;d=DwMGaQ&amp;c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&amp;m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&amp;s=4f0H68LTvkp7N-bYTVLOhWqiEbHaCsOQR1z_Qzz3Wf4&amp;e="
                    moz-do-not-send="true">
                    SR Policy Architecture</a> </span></i></b><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">draft:</span></i></b><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span style="font-size:10.0pt">   A variation of SR Policy
              can be used for packet replication.  A</span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span style="font-size:10.0pt">   candidate path could
              comprise multiple SID-Lists; one for each</span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span style="font-size:10.0pt">   replication path.  In such
              a scenario, packets are actually</span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span style="font-size:10.0pt">   replicated through each
              SID List of the SR Policy to realize a point-</span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span style="font-size:10.0pt">   to-multipoint service
              delivery. </span><o:p></o:p></p>
          <p class="MsoNormal"> <o:p></o:p></p>
          <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">This
                  looks to me as being very much multicast in SR, and,
                  unless you want to say that it is limited to SRv6,
                  makes my question relevant IMHO.</span></i></b><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <div>
                <p class="MsoListParagraph"
                  style="margin-left:1.0in;text-indent:-.25in"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">b.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">From
                    my POV the ST-MPLS only uses Downstream-allocated
                    labels – but I expect the draft to state that
                    explicitly, one way or another. (If
                    Upstream-allocated labels are relevant for SR-MPLS,
                    I would see it as a major gap, so I hope that this
                    is not the case).</span><o:p></o:p></p>
              </div>
            </div>
          </blockquote>
          <p class="MsoNormal"><span style="font-family:&quot;Times New
              Roman \,serif&quot;">#Ahmed: I will add a statement in
              section 2.2 to mention that it is down-stream allocated as
              you mentioned</span><o:p></o:p></p>
          <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">[[Sasha]]
                  This is quite unambiguous and, once added, would
                  resolve my comment in full – the previous comment
                  notwithstanding. In particular, it would imply that
                  even labels representing BSIDs of a SR Replication
                  policies will be downstream-allocated.
                </span></i></b><o:p></o:p></p>
          <p class="MsoNormal"><span style="font-family:&quot;Times New
              Roman \,serif&quot;"> </span><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <div>
                <p class="MsoListParagraph" style="text-indent:-.25in"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">2.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><b><span
                      style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Label
                      spaces in SR-MPLS</span></b><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:</span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.0in;text-indent:-.25in"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">a.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">RFC
                    3031 (referenced by the draft) defines per-platform
                    and per-interface label spaces, and RFC 5331 (<b><i>not
                        mentioned in the draft</i></b>) adds
                    context-specific label spaces and context labels. </span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.0in;text-indent:-.25in"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">b.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">The
                    draft does not say which of these are or are not
                    relevant for SR-MPLS</span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.0in;text-indent:-.25in"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">c.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">From
                    my POV:</span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.5in;text-indent:-1.5in"><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">                                        
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">i.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Labels
                    representing all kinds of SIDs mentioned in the
                    draft MUST be allocated from the per-platform label
                    space only
                  </span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.5in;text-indent:-1.5in"><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">                                       
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">ii.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">At
                    the same time, instantiation of Mirror Segment IDs
                    defined in Section 5.1 of the Segment Routing
                    Architecture draft using MPLS data plane clearly
                    calls for context labels and context-specific label
                    spaces</span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.0in;text-indent:-.25in"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">d.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">I
                    expect the draft to provide a clear-cut position on
                    these aspects of SR-MPLS.</span><o:p></o:p></p>
              </div>
            </div>
          </blockquote>
          <p class="MsoNormal"><span style="font-family:&quot;Times New
              Roman \,serif&quot;">#Ahmed: I will add a statement to
              section 2.2 to say that the it is per-platform. Regarding
              the function "mirroring", SR attaches a *function* to each
              SID. The "mirroring" function is already described in
              Section 5.1 of draft-ietf-spring-segment-routing and is
              not specific to the MPLS forwarding plane. Hence there is
              no need to re-mention it here because this document is
              trying to be as specific as possible to the MPLS
              forwarding plane. General functions attached to SID are
              described in the segment routing architecture document or
              future documents. Furture documents proposing new SR
              function must be as specific and clear as possible</span><o:p></o:p></p>
          <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                  Looks OK to me.</span></i></b><o:p></o:p></p>
          <p class="MsoNormal"><span style="font-family:&quot;Times New
              Roman \,serif&quot;"> </span><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <div>
                <p class="MsoListParagraph" style="text-indent:-.25in"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">3.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><b><span
                      style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">SR-MPLS
                      and hierarchical LSPs</span></b><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:</span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.0in;text-indent:-.25in"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">a.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">SR
                    LSPs that include more than one segment are
                    hierarchical LSPs from the POV of the MPLS data
                    plane. Therefore some (possibly, all) of the models
                    for handling TTL and TC bits that have been defined
                    in RFC 3443 (<b><i>not mentioned in the draft</i></b>)
                    should apply to SR-MPLS</span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.0in;text-indent:-.25in"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">b.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">RFC
                    8287 (<b><i>not referenced in the draft</i></b>)
                    specifically discussed operation of the LSP
                    Traceroute function for SR LSPs in the case when
                    Pipe/Short Pipe model for TTL handling is used</span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.0in;text-indent:-.25in"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">c.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">I
                    expect the draft to provide at least some guidelines
                    regarding applicability of each specific model
                    defined in RFC 3443 (separately for TTL and TC bits)
                    to SR-MPLS.</span><o:p></o:p></p>
              </div>
            </div>
          </blockquote>
          <p class="MsoNormal"><span style="font-family:&quot;Times New
              Roman \,serif&quot;">#Ahmed: BY design, the instantiation
              of SR over the MPLS forwarding plane (and hence this
              draft) does not modify the MPLS forwarding plan behavior
              as it is mentioned in the first sentence in Section 1. So
              the TTL behavior specified in rfc3443 is already implied
              and there is no need to re-mention it here just like all
              aspects of MPLS forwarding. RFC8287 is OAM-specific. 
              SR-OAM is handled in a separate document so is outside the
              scope of this draft</span><o:p></o:p></p>
          <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                  Unfortunately I do not think this is good enough. Let
                  me ask a specific question reflecting my concerns:</span></i></b><o:p></o:p></p>
          <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">The
                  head-end node sends SR-MPLS packets across a path
                  defined by an ordered set of SIDs with more than one
                  SID in the list. Each SID is represented by a label
                  stack entry (LSE) in the MPLS label stack, and the
                  label field in each LSE is the label that matches the
                  corresponding SID. However, each LSE also includes the
                  TTL and TC fields. How does the head-end node set
                  these fields in each of the LSEs following the top
                  one? This clearly depends on the model (Uniform vs.
                  Pipe/Short Pipe) implemented in each node that that
                  performs Next operation on the packet along the path –
                  but the head-end node usually is not aware of that.
                </span></i></b><o:p></o:p></p>
          <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">RFC
                  8287 is relevant as an example here IMHO because it
                  recommends the following setting of TTL in Traceroute
                  packets:</span></i></b><o:p></o:p></p>
          <p class="MsoListParagraph"
            style="margin-left:.55in;text-indent:-.25in;mso-list:l1
            level1 lfo6">
            <!--[if !supportLists]--><span style="mso-list:Ignore">-<span
                style="font:7.0pt &quot;Times New Roman&quot;">         
              </span></span><!--[endif]--><b><i><span
                  style="color:#00B050">Set the TTL of all the labels
                  above one that represents the segment you are
                  currently tracing to maximum</span></i></b><o:p></o:p></p>
          <p class="MsoListParagraph"
            style="margin-left:.55in;text-indent:-.25in;mso-list:l1
            level1 lfo6">
            <!--[if !supportLists]--><span style="mso-list:Ignore">-<span
                style="font:7.0pt &quot;Times New Roman&quot;">         
              </span></span><!--[endif]--><b><i><span
                  style="color:#00B050">Set the TTL of the label one
                  that represents the segment you are currently tracing
                  to the desired value (to be incremented until end of
                  segment is reached</span></i></b><o:p></o:p></p>
          <p class="MsoListParagraph"
            style="margin-left:.55in;text-indent:-.25in;mso-list:l1
            level1 lfo6">
            <!--[if !supportLists]--><span style="mso-list:Ignore">-<span
                style="font:7.0pt &quot;Times New Roman&quot;">         
              </span></span><!--[endif]--><b><i><span
                  style="color:#00B050">Set the TTL of all the labels
                  below one that represents the segment you are
                  currently tracing to 0.</span></i></b><o:p></o:p></p>
          <p class="MsoNormal"><b><i><span
                  style="font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">I
                  expect the draft to provide some recommendations for
                  traffic (non-OAM) packets as well.</span></i></b><o:p></o:p></p>
          <p class="MsoNormal"><span style="font-family:&quot;Times New
              Roman \,serif&quot;"> </span><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <div>
                <p class="MsoListParagraph" style="text-indent:-.25in"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">4.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><b><span
                      style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Inferring
                      network layer protocol in SR-MPLS</span></b><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:</span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.0in;text-indent:-.25in"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">a.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">I
                    wonder if the draft could provide any details on the
                    situation when a label that represents some kind of
                    SID is the bottom-of-stack label to be popped by the
                    egress LER</span><o:p></o:p></p>
              </div>
            </div>
          </blockquote>
          <p class="MsoNormal"><span style="font-family:&quot;Times New
              Roman \,serif&quot;">#ahmed: This is part of the "Next"
              function. It is described in detail in this document.
            </span><o:p></o:p></p>
          <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                  NEXT function is mentioned in several places in the
                  document. Can you please point to the specific text
                  that is relevant for my question?</span></i></b><o:p></o:p></p>
          <p class="MsoNormal"><span style="font-family:&quot;Times New
              Roman \,serif&quot;"> </span><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <div>
                <p class="MsoListParagraph"
                  style="margin-left:1.0in;text-indent:-.25in"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">b.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">For
                    the reference, RFC 3032 says that “the identity of
                    the network layer protocol  must be inferable from
                    the value of the label which is popped from  the
                    bottom of the stack, possibly along with the
                    contents  of the network layer header itself”</span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.0in;text-indent:-.25in"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">c.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">From
                    my POV the following scenario indicates relevance of
                    this expectation for SR-MPLS:</span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.5in;text-indent:-1.5in"><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">                                        
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">i.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">IS-IS
                    is used for distributing both IPv4 and IPv6
                    reachability in a given domain</span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.5in;text-indent:-1.5in"><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">                                       
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">ii.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">An
                    IS-IS adjacency over some dual-stack link is
                    established, and a single Adj-SID for this adjacency
                    is advertised</span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.5in;text-indent:-1.5in"><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">                                      
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">iii.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">The
                    node that has assigned and advertised this Adj-SID
                    receives a labeled packet with the label
                    representing this Adj-SID being both the top and
                    bottom-of-stack label</span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.5in;text-indent:-1.5in"><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">                                      
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">iv.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">The
                    implementers must be given unambiguous instructions
                    for forwarding the unlabeled packet via the
                    dual-stack link as an Ipv4 or an IPv6 packet.</span><o:p></o:p></p>
              </div>
            </div>
          </blockquote>
          <p class="MsoNormal"><span style="font-family:&quot;Times New
              Roman \,serif&quot;">#Ahmed: If you take a look at the
              SR-ISIS , SR-OSPFv2 and SR-OSFv3 drafts, you will see all
              3 protocol advertise different adj-SIDS for IPv4 next-hop
              and IPv6 next-hop. For example, ISIS uses the "F-Flag"
              (section 2.2.1 in
              draft-ietf-isis-segment-routing-extensions-18) to specify
              whether the adj-SID is for IPv4 and IPv6. Similarly, the
              SR-ISIS draft attaches a prefix-SID to the prefix
              advertisement and hence implies the identity of the
              protocol underneath the bottom most label. For any other
              "function" attached to a SID, it is part of the
              specification of this function to describe what happens
              when the SID is represented by a label in the MPLS
              forwarding plane and this label is the bottom most label
            </span><o:p></o:p></p>
          <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                  OK, got it. This issue is resolved.</span></i></b><o:p></o:p></p>
          <p class="MsoNormal"><span style="font-family:&quot;Times New
              Roman \,serif&quot;"> </span><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <div>
                <p class="MsoListParagraph" style="text-indent:-.25in"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">5.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><b><span
                      style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Resolution</span></b><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">
                    <b>of Conflicts</b>: Are the</span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.0in;text-indent:-.25in"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">a.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Are
                    the conflict resolution procedures listed in section
                    2.5 mandatory to implement?
                  </span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.0in;text-indent:-.25in"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">b.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">If
                    they are mandatory to implement, are they also
                    mandatory to deploy, or can the operators simply
                    treat any detected conflict as requiring human
                    intervention and preventing normal operation of
                    SR-MPLS?</span><o:p></o:p></p>
              </div>
            </div>
          </blockquote>
          <p class="MsoNormal"><span style="font-family:&quot;Times New
              Roman \,serif&quot;">#Ahmed: They are recommended. I will
              modify the paragraph after the first 3 bullets in Section
              2.5 to say that it is recommeded.  
            </span><o:p></o:p></p>
          <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                  OK. However, it would be nice if you could refer
                  separately for “RECOMMENDED to implement” and
                  “RECOMMENDED to deploy”.  The latter probably requires
                  a configuration knob for enabling conflict resolution
                  rules (if they are implemented).
                </span></i></b><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <div>
                <p class="MsoListParagraph"
                  style="margin-left:1.0in;text-indent:-.25in"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">c.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">For
                    the reference, the IETF capitalized MUST appears
                    just in a few places in Section 2.5, and each
                    appearance has very narrow context:</span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.5in;text-indent:-1.5in"><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">                                        
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">i.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">For
                    MCCs where the "Topology" and/or "Algorithm" fields
                    are not defined, the numerical value of zero MUST be
                    used for these two fields</span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.5in;text-indent:-1.5in"><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">                                       
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">ii.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">If
                    the same set of FECs are attached to the same label
                    "L1", then the tie-breaking rules MUST always select
                    the same FEC irrespective of the order in which the
                    FECs and the label "L1" are received. In other
                    words, the tie-breaking rule MUST be deterministic.
                  </span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.5in;text-indent:-1.5in"><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">                                      
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">iii.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">An
                    implementation of explicit SID assignment MUST
                    guarantee collision freeness on the same router</span><o:p></o:p></p>
                <p class="MsoNormal" style="margin-left:1.0in"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">From
                    my POV, it is not possible to infer the answer to my
                    question from these statements. Some explicit
                    statement is required.</span><o:p></o:p></p>
              </div>
            </div>
          </blockquote>
          <p class="MsoNormal"><span style="font-family:&quot;Times New
              Roman \,serif&quot;">#Ahmed: I agree with you POV and as
              mentioned in my reply to items (a) and (b), I will modify
              the paragraph to say that it is RECOMMENDED to answer you
              questions in items (a) and (b)</span><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <div>
                <p class="MsoListParagraph"
                  style="margin-left:1.0in;text-indent:-.25in"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">d.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">The
                    tie-breaking rules in section 2.5.1 include some
                    specific values for encoding FEC types and address
                    families – but these values are not supposed to
                    appear in any IANA registries (because the draft
                    does not request any IANA actions). Can you please
                    clarify what is so special about these values?
                  </span><o:p></o:p></p>
              </div>
            </div>
          </blockquote>
          <p class="MsoNormal"><span style="font-family:&quot;Times New
              Roman \,serif&quot;">#Ahmed: There is no significance to
              the values but there is a significance to the order among
              them. I will modify the text to clarify that</span><o:p></o:p></p>
          <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                  OK.
                </span></i></b><o:p></o:p></p>
          <p class="MsoNormal"><span style="font-family:&quot;Times New
              Roman \,serif&quot;"> </span><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <div>
                <p class="MsoListParagraph"
                  style="margin-left:1.0in;text-indent:-.25in"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">e.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">I
                    also doubt that comparison of FECs that represent
                    IPv4 and IPv6 prefix SIDs makes much sense (for
                    conflict resolution or else), because, among other
                    things, there are valid scenarios when an IPv4 /32
                    prefix is embedded in an IPv6 /128 one.</span><o:p></o:p></p>
              </div>
            </div>
          </blockquote>
          <p class="MsoNormal"><span style="font-family:&quot;Times New
              Roman \,serif&quot;">#Ahmed: A prefix-SID is assigned to a
              prefix. An IPv6 prefix that embeds an IPv4 prefix is
              different from the IPv4 prefix. The specifications of SR
              extensions to ISIS, OSPFv2, OSPFv3, and BGP treat IPv4 and
              IPv6 prefixes separately, including the IPV6 prefixes with
              embedded IPv4 ones. Besides not all IPv6 prefixes embed
              IPv4 prefix in them. Hence the distinction between IPv4
              and IPv6 prefixes is quite clear
            </span><o:p></o:p></p>
          <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                  My concern was mainly about IPv4-mapped IPv6
                  addresses. Quoting from RFC 4291:</span></i></b><o:p></o:p></p>
          <h5 style="mso-line-height-alt:0pt"><a
href="https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_rfc4291-23section-2D2.5.5.2&amp;d=DwMGaQ&amp;c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&amp;m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&amp;s=I14XA8I9Ruw5aBj5er_OVbvADz1sb9ZLFBGaZZlJJJ4&amp;e="
              moz-do-not-send="true"><b><span
                  style="font-size:10.0pt;font-family:&quot;Courier New
                  \;color\:black&quot;">2.5.5.2</span></b></a><a
              name="section-2.5.5.2" moz-do-not-send="true"></a><b><span
                style="font-size:10.0pt;font-family:&quot;Courier New
                \;color\:black&quot;">.  IPv4-Mapped IPv6 Address</span></b><o:p></o:p></h5>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span style="font-size:10.0pt"> </span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span style="font-size:10.0pt"> </span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span style="font-size:10.0pt">   A second type of IPv6
              address that holds an embedded IPv4 address is</span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span style="font-size:10.0pt">   defined.  <span
                style="background:yellow;mso-highlight:yellow">
                This address type is used to represent the addresses of</span></span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span
              style="font-size:10.0pt;background:yellow;mso-highlight:yellow">  
              IPv4 nodes as IPv6 addresses</span><span
              style="font-size:10.0pt">.</span><o:p></o:p></p>
          <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D"> </span></i></b><o:p></o:p></p>
          <p class="MsoNormal"><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">From
                  my POV this means that a /128 prefix associated with
                  an IPv4-mapped IPv6 address and a /32 prefix
                  associated with the IPv4 address that was mapped to
                  this IPv6 address represent the same entity. This
                  understanding fully matches usage of IPv4-mapped IPv6
                  addresses as BGP Next Hops of VPN-IPv6 addresses
                  defined in RFC 4798. However, the comparison rules you
                  have defined will treat them as two different
                  prefixes.  I wonder if these rules, in the case of a
                  conflict, could result in preferring the IPv6 prefix
                  to an IPv4 one and therefore loosing MPLS connectivity
                  for the ingress PE of a 6VPE service to its egress PE?</span></i></b><o:p></o:p></p>
          <p class="MsoNormal"><span style="font-family:&quot;Times New
              Roman \,serif&quot;"> </span><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <div>
                <p class="MsoListParagraph"
                  style="margin-left:1.0in;text-indent:-.25in"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">f.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">    
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Section
                    2.5.1 defines 3 types of SR-MPLS FECs, but I am not
                    sure all SID types defined in the Segment Routing
                    Architecture draft can be unambiguously mapped to
                    one of these types. Problematic examples include at
                    least the following:</span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.5in;text-indent:-1.5in"><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">                                        
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">i.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Parallel
                    Adjacency SID</span><o:p></o:p></p>
                <p class="MsoListParagraph"
                  style="margin-left:1.5in;text-indent:-1.5in"><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">                                       
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">ii.</span><span
                    style="font-size:7.0pt;font-family:&quot;Times New
                    Roman \,serif&quot;">   
                  </span><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Mirror
                    SID</span><o:p></o:p></p>
                <p class="MsoNormal" style="margin-left:1.0in"><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Explicit
                    mapping of SID types to SR-MPLS FEC types would be
                    most useful IMO. If some SID types cannot be mapped
                    to SR-MPLS FECs, this must be explicitly stated in
                    the draft.</span><o:p></o:p></p>
              </div>
            </div>
          </blockquote>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
              <br>
              Parallel adjacency SID are handled in the type "(next-hop,
              outgoing interface)" </span>
            <o:p></o:p></p>
          <p class="MsoNormal"
            style="margin-bottom:0in;margin-bottom:.0001pt;line-height:normal">
            <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                  OK</span></i></b><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span style="font-family:&quot;Times New Roman&quot;,serif"><br>
              Mirror SID is a type of binding-SID as mentioned in
              Section 5.1 in the SR architecture draft
              (draft-ietf-spring-segment-routing-15). Also as described
              in Section 2.4
              draft-ietf-isis-segment-routing-extensions-18 (also see
              the equivalent in the OSPFv2 and OSPFv3 draft), a binding
              SID is identified by a prefix. Hence it is covered by the
              type "(Prefix, Routing Instance, Topology, Algorithm)"</span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin-bottom:0in;margin-bottom:.0001pt;line-height:normal">
            <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                  I respectfully disagree. There is definitely no
                  mention of Algorithm in the definition of the Mirror
                  SID.
                </span></i></b><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin-left:0in;line-height:normal"><span
              style="font-family:&quot;Times New Roman&quot;,serif"> </span><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <p class="MsoListParagraph" style="text-indent:-.25in"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">6.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><b><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Node
                    SIDs in SR-MPLS</span></b><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:1.0in;text-indent:-.25in"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">a.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Node
                  SIDs are explicitly defined and discussed in the
                  Segment Routing Architecture draft but are not
                  mentioned even once in this draft</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:1.0in;text-indent:-.25in"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">b.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">AFAIK,
                  the common implementation practice today includes
                  assignment of at least one Node SID to every node in
                  the SR-MPLS domain</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:1.0in;text-indent:-.25in"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">c.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Is
                  there a requirement to assign at least one Node SID
                  per {routing instance, topology, algorithm} in
                  SR-MPLS? If not, can the authors explain expected
                  behavior of such a node? (See also my comment about
                  routing instances below).</span><o:p></o:p></p>
            </div>
          </blockquote>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
              A Node-SID is a special case of prefix-SID. So there
              nothing specific about it from the MPLS forwarding plane
              point of view. Similarly from a standard tracks draft
              point of view, there is no requirement to assign a SID to
              every prefix just like there is no requirement to bind
              every prefix to an LDP label. Common and/or recommended
              practices or description of deployment scenarios are more
              befitting to BCP or informational drafts. This draft is a
              standards track draft</span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin-bottom:0in;margin-bottom:.0001pt;line-height:normal">
            <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                  Well, you’ve just said that conflict resolution rules
                  are RECOMMENDED, and this is quite common in the
                  Standards Track RFCs.
                </span></i></b><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span style="font-family:&quot;Times New Roman&quot;,serif"><br>
              If a {routing instance, topology, algorithm} is not
              assigned a SID, then this FEC is totally irrelavant to
              this draft and hence describing how a node treats it is
              totally outside the scope of this draft</span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin-bottom:0in;margin-bottom:.0001pt;line-height:normal">
            <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                  AFAIK, neither of the SR extension drafts for IGPs
                  mention routing instances that can be associated with
                  the prefix, so I think that your reference to it is
                  incorrect.</span></i></b><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin-bottom:0in;margin-bottom:.0001pt;line-height:normal">
            <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">What’s
                  more I suspect that Node SIDs represent the most used
                  special case of Prefix SIDs with Anycast SIDs being
                  quite behind.  Therefore some recommendation
                  pertaining to the usage of Node SIDs would be very
                  much in place IMHO. </span></i></b><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin-left:0in;line-height:normal"><span
              style="font-family:&quot;Times New Roman&quot;,serif"> </span><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <p class="MsoListParagraph" style="text-indent:-.25in"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">7.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><b><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">SRGB
                    Size in SR-MPLS</span></b><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:
                </span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:1.0in;text-indent:-.25in"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">a.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">The
                  draft correctly treats the situation when an index
                  assigned to some global SID cannot be mapped to a
                  label using the procedure in Section 2.4 as a
                  conflict.</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:1.0in;text-indent:-.25in"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">b.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">At
                  the same time the draft does not define any minimum
                  size of SRGB (be it defined as a single contiguous
                  block or as a sequence of such blocks) that MUST be
                  implemented by all SR-capable nodes</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:1.0in;text-indent:-.25in"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">c.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">I
                  suspect that lack of such a definition could be
                  detrimental to interoperability of SR-MPLS solutions.
                  AFAIK, the IETF has been following, for quite some
                  time, a policy that some reasonable MUST-to-implement
                  defaults should be assigned for all configurable
                  parameters exactly in order to prevent this.</span><o:p></o:p></p>
            </div>
          </blockquote>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
              This document specifies how the SRGB is used and the
              behavior of routers when a prefix-SID index maps to a
              label inside and/or outside the SRGB. The actual size of
              the SRGB is a task in partitioning the label space, which
              is very specific to a particular deployment scenario. So
              IMO it is outside the scope of a standards track document.
              Now that SR-MPLS is deployed in many places, I expect the
              community to gain sufficient experience to recommend (or
              not recommend) a particular minimum/maximum size for the
              SRGB is some future informational or BCP draft/RFC</span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin-bottom:0in;margin-bottom:.0001pt;line-height:normal">
            <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                  My reading of your response is that minimum size of
                  SRGB is an issue for future study. Can you please just
                  add this to the draft?</span></i></b><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin-left:0in;line-height:normal"><span
              style="font-family:&quot;Times New Roman&quot;,serif"> </span><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <p class="MsoListParagraph" style="text-indent:-.25in"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">8.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><b><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Algorithms
                    and Prefix SIDs</span></b><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:1.0in;text-indent:-.25in"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">a.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">The
                  draft mentions Algorithms (as part of SR-MPLS Prefix
                  FEC) in, but it does not explicitly link them with the
                  Prefix-SID algorithms defined in section 3.1.1 of the
                  Segment Routing Architecture draft</span><o:p></o:p></p>
            </div>
          </blockquote>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
              I will just add the reference
              [I-D.ietf-spring-segment-routing] right beside the first
              time "Algorithm" is mentioned</span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin-bottom:0in;margin-bottom:.0001pt;line-height:normal">
            <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">[[Sasha]]
                  OK</span></i></b><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin-left:0in;line-height:normal"><span
              style="font-family:&quot;Times New Roman&quot;,serif"> </span><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <p class="MsoListParagraph"
                style="margin-left:1.0in;text-indent:-.25in"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">b.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">From
                  my POV, the draft should explicitly state that the
                  default Prefix-SID algorithm MUST be implemented in
                  all SR-MPLS-compliant routers.</span><o:p></o:p></p>
            </div>
          </blockquote>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
              The specification of what path calculation method should
              or must be supported is a routing protocol property not a
              forwarding plane property. In fact, the choice of a path
              calculation method or algorithm is completely orthogonal
              to the routed protocol. Hence mandating the support of a
              particular routing algorithm is beyond the scope of this
              document.</span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin-bottom:0in;margin-bottom:.0001pt;line-height:normal">
            <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">[[Sasha]]
                  OK</span></i></b><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin-left:0in;line-height:normal"><span
              style="font-family:&quot;Times New Roman&quot;,serif"> </span><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <p class="MsoListParagraph"
                style="margin-left:1.0in;text-indent:-.25in"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">c.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">The
                  Segment Routing Architecture draft states (in section
                  3.1.3) that “Support of multiple algorithms applies to
                  SRv6”. But neither draft states whether multiple
                  algorithms apply to SR-MPLS. Can you please clarify
                  this point?</span><o:p></o:p></p>
            </div>
          </blockquote>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
              The last paragraph of Section 3.1.2 titled SR-MPLS in
              draft-ietf-spring-segment-routing-15 discusses the support
              of multiple algorithms. So it is implied that the concept
              of algorithm applies to SR-MPLS. Hence there is no need to
              re-mention it here</span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin-bottom:0in;margin-bottom:.0001pt;line-height:normal">
            <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                  The paragraph to which you refer only says that if a
                  packet with the active Prefix-SID that is associated
                  with a specific algorithm is received by a node that
                  does not support this algorithm, this packet will be
                  discarded. If this is the only type of support for
                  multiple algorithms SR provides, it is not very useful
                  IMHO</span></i></b><b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">.
                </span></i></b><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin-left:0in;line-height:normal"><span
              style="font-family:&quot;Times New Roman&quot;,serif"> </span><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <p class="MsoListParagraph" style="text-indent:-.25in"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">9.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><b><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Routing
                    instances and the context for Prefix-SIDs</span></b><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:1.0in;text-indent:-.25in"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">a.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">The
                  Segment Routing Architecture draft states in Section
                  3.1 that the “context for an IGP-Prefix segment
                  includes the prefix, topology, and algorithm”</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:1.0in;text-indent:-.25in"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">b.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">This
                  draft seems to define (in section 2.5) the context for
                  the Prefix SID as “Prefix, Routing Instance, Topology,
                  Algorithm” where ”a routing instance is identified by
                  a single incoming label downloader to FIB” (but the
                  notion of the label downloader to FIB is not defined).</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:1.0in;text-indent:-.25in"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">c.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">These
                  two definitions look different to me.
                </span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:1.0in;text-indent:-.25in"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">d.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">At
                  the very least I would expect alignment between the
                  definitions of context for the Prefix-SID between the
                  two drafts. Preferably, the definition given in the
                  Segment Routing Architecture draft should be used in
                  both drafts.</span><o:p></o:p></p>
            </div>
          </blockquote>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
              The context of the section 2.5 is limited to the
              resolution of local label collision. The use of "routing
              instance" in section 2.5 is just there for tie-breaking if
              there is local label collision.</span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin-bottom:0in;margin-bottom:.0001pt;line-height:normal">
            <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                  I have already mentioned that “routing instances” are
                  not defined in any the drafts dealing with SR
                  Extensions for IGPs. So I do not understand how the
                  conflict resolution procedure is supposed to use this.
                  And in any case the difference between two definitions
                  of the context of Prefix-SID requires some
                  explanation.</span></i></b><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin-left:0in;line-height:normal"><span
              style="font-family:&quot;Times New Roman&quot;,serif"><br>
              <br>
            </span><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <p class="MsoListParagraph" style="text-indent:-.25in"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">10.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">
                </span><b><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Example
                    of PUSH operation in Section 2.10.1</span></b><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:1.0in;text-indent:-.25in"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">a.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">The
                  first para of this section begins with the sentence
                  “Suppose an MCC on a router "R0" determines that PUSH
                  or CONTINUE   operation is to be applied to an
                  incoming packet whose active SID is the global SID
                  "Si"”. In the context of SR-MPLS this means (to me)
                  that the incoming packet is a labeled packet and its
                  top label matches the global SID “Si”.
                </span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:1.0in;text-indent:-.25in"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">b.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">However,
                  the example for PUSH operation in the next para of
                  this section is the case of an (unlabeled) IP packet
                  with the destination address covered by the IP prefix
                  for which “Si” has been assigned. </span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:1.0in;text-indent:-.25in"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">c.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">From
                  my POV:</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:1.5in;text-indent:-1.5in"><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">                                        
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">i.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Mapping
                  unlabeled packets to SIDs is indeed out of scope of
                  the draft. Therefore an example of a PUSH operation
                  that is applied to a labeled packet (with the active
                  SID inferred from the top label in the stack) is
                  preferable.</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:1.5in;text-indent:-1.5in"><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">                                       
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">ii.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Valid
                  examples of  PUSH operation applied to a labeled
                  incoming packet can be found in Sections 4.2 or 4.3 of
                  the
                  <a
href="https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_draft-2Dbashandy-2Drtgwg-2Dsegment-2Drouting-2Dti-2Dlfa-2D04&amp;d=DwMGaQ&amp;c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&amp;m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&amp;s=jbH0DSYYo2UYymWZrlvAt7qUWVXsYKuCtMiEyoe-DWE&amp;e="
                    moz-do-not-send="true">
                    TI-LFA</a> draft</span><o:p></o:p></p>
              <p class="MsoNormal"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif"> </span><o:p></o:p></p>
            </div>
          </blockquote>
          <p class="MsoNormal"
            style="margin-left:0in;line-height:normal"><span
              style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
              I do not understand your concern here:)</span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin-bottom:0in;margin-bottom:.0001pt;line-height:normal">
            <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                  I think it is pretty clear: can you provide an example
                  of a PUSH operation applied to a labeled packet
                  instead of your current example?</span></i></b><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span style="font-family:&quot;Times New Roman&quot;,serif"> </span><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <p class="MsoNormal"><b><span
                    style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Nits</span></b><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">:</span>
                <o:p></o:p></p>
              <p class="MsoListParagraph" style="text-indent:-.25in"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">1.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">I
                  concur with Adrian regarding numerous nits he has
                  reported in his
                  <a
href="https://urldefense.proofpoint.com/v2/url?u=https-3A__mailarchive.ietf.org_arch_msg_spring_FRhO2lgR8r4VlKP2ZN2dZwHU5BY&amp;d=DwMGaQ&amp;c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&amp;m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&amp;s=I_4gDFhcjR_1npqKUQDHThsejUMgJy3WlLzC90poR1w&amp;e="
                    moz-do-not-send="true">
                    WG LC Comment</a>. I would like to thank Adrian for
                  an excellent review that have saved me lots of hard
                  work.</span><o:p></o:p></p>
            </div>
          </blockquote>
          <p class="MsoNormal"
            style="margin-left:0in;line-height:normal"><span
              style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
              I also agree that Adrian's review is exceptional. I
              believe I addressed all his comments in the latest
              version.</span><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <p class="MsoListParagraph" style="text-indent:-.25in"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">2.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">In
                  addition, I’d like to report the following nits:</span><o:p></o:p></p>
              <p class="MsoListParagraph"
                style="margin-left:1.0in;text-indent:-.25in"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">a.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">Ti-LFA
                  in Section 2.11.1 should be TI-LFA (as in the
                  <a
href="https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_draft-2Dbashandy-2Drtgwg-2Dsegment-2Drouting-2Dti-2Dlfa-2D04&amp;d=DwMGaQ&amp;c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&amp;m=CBn46-tTjZrFup0dR-EGAtt4QFq9Pi27RaO5rQCk1Qw&amp;s=jbH0DSYYo2UYymWZrlvAt7qUWVXsYKuCtMiEyoe-DWE&amp;e="
                    moz-do-not-send="true">
                    TI-LFA</a> draft)</span><o:p></o:p></p>
            </div>
          </blockquote>
          <p class="MsoNormal"
            style="margin-left:0in;line-height:normal"><span
              style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
              Already done in the latest version</span><b><i>[[Sasha]]
                OK</i></b>
            <o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <p class="MsoListParagraph"
                style="margin-left:1.0in;text-indent:-.25in"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">b.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">TI-LFA
                  draft is referenced in the text of Section 2.11.1, but
                  there is no matching reference in the “References”
                  section (probably, Informational)</span><o:p></o:p></p>
            </div>
          </blockquote>
          <p class="MsoNormal"
            style="margin-left:0in;line-height:normal"><span
              style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
              Already done in the latest version</span><b><i>[[Sasha]]
                OK</i></b>
            <o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <p class="MsoListParagraph"
                style="margin-left:1.0in;text-indent:-.25in"><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">c.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">“zero
                  Algorithm” in Section 2.5 (immediately above Section
                  2.5.1) must be replaced with “default algorithm”.
                  Similarly, “non-zero Algorithm” should be replaced
                  with “non-default algorithm”</span><o:p></o:p></p>
            </div>
          </blockquote>
          <p class="MsoNormal"
            style="margin-left:0in;line-height:normal"><span
              style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
              Will be done in the next version</span><b><i>[[Sasha]]
              </i></b> OK<o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <p class="MsoListParagraph" style="text-indent:-.25in"><span
style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">3.</span><span
                  style="font-size:7.0pt;font-family:&quot;Times New
                  Roman \,serif&quot;">   
                </span><span
                  style="font-size:10.0pt;font-family:&quot;Verdana&quot;,sans-serif">I
                  think that RFC 3443 and RFC 5332 should be listed as
                  Normative references in this draft while RFC 5331 and
                  RFC 8277 should be listed as Informative references.
                  This would improve the readability of the draft
                  without any impact on its advancement. </span><o:p></o:p></p>
              <p class="MsoNormal"> <o:p></o:p></p>
            </div>
          </blockquote>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed
              RFC5331 describes upstream label assignment. As you
              mentioned above (and I will modify the draft to indicate
              that) SR-MPLS behavior is similar to downstream label
              assignment. RFC 3443 describes TTL behavior. This is an
              MPLS forwarding behavior. As mentioned in the draft,
              SR-MPLS does not modify at the MPLS forwarding behavior</span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin-bottom:0in;margin-bottom:.0001pt;line-height:normal">
            <b><i><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#00B050">[[Sasha]]
                  Regarding RFC 5331 – you may skip this reference if
                  you state (as discussed below) that SR-MPLS only
                  allocates labels from the per-platform label space.
                  Regarding RFC 3443 – I do not think that you can fully
                  avoid discussion of Uniform and Pipe/Short Pipe
                  models, and therefore you will need this reference.</span></i></b><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin-left:0in;line-height:normal"><span
              style="font-family:&quot;Times New Roman&quot;,serif"><br>
              <br>
            </span><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <p class="MsoNormal">Hopefully, these comments will be
                useful.<o:p></o:p></p>
            </div>
          </blockquote>
          <p class="MsoNormal"
            style="margin-left:0in;line-height:normal"><span
              style="font-family:&quot;Times New Roman&quot;,serif">#Ahmed:
              They are certainly quite useful. Thanks a lot</span><o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <p class="MsoNormal"> <o:p></o:p></p>
              <p class="MsoNormal">Regards,<o:p></o:p></p>
              <p class="MsoNormal">Sasha<o:p></o:p></p>
              <p class="MsoNormal"> <o:p></o:p></p>
              <p class="MsoNormal">Office: +972-39266302<o:p></o:p></p>
              <p class="MsoNormal">Cell:      +972-549266302<o:p></o:p></p>
              <p class="MsoNormal">Email:   <a
                  href="mailto:Alexander.Vainshtein@ecitele.com"
                  moz-do-not-send="true">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
              <p class="MsoNormal"> <o:p></o:p></p>
            </div>
            <p class="MsoNormal"
              style="margin:0in;margin-bottom:.0001pt;line-height:normal">
              <span style="font-family:&quot;Times New
                Roman&quot;,serif"><br clear="all">
___________________________________________________________________________<br>
                <br>
                This e-mail message is intended for the recipient only
                and contains information which is
                <br>
                CONFIDENTIAL and which may be proprietary to ECI
                Telecom. If you have received this
                <br>
                transmission in error, please inform us by e-mail, phone
                or fax, and then delete the original
                <br>
                and all copies thereof.<br>
___________________________________________________________________________</span><o:p></o:p></p>
          </blockquote>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span style="font-family:&quot;Times New Roman&quot;,serif"> </span><o:p></o:p></p>
          <p class="MsoNormal"
            style="margin:0in;margin-bottom:.0001pt;line-height:normal">
            <span style="font-family:&quot;Times New Roman&quot;,serif"><br
                clear="all">
___________________________________________________________________________<br>
              <br>
              This e-mail message is intended for the recipient only and
              contains information which is
              <br>
              CONFIDENTIAL and which may be proprietary to ECI Telecom.
              If you have received this
              <br>
              transmission in error, please inform us by e-mail, phone
              or fax, and then delete the original
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___________________________________________________________________________<o:p></o:p></span></p>
        </blockquote>
        <p class="MsoNormal"
          style="margin:0in;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New Roman&quot;,serif"><o:p> </o:p></span></p>
        <p class="MsoNormal"
          style="margin:0in;margin-bottom:.0001pt;line-height:normal">
          <span style="font-family:&quot;Times New
            Roman&quot;,serif;color:windowtext"><br>
___________________________________________________________________________<br>
            <br>
            This e-mail message is intended for the recipient only and
            contains information which is
            <br>
            CONFIDENTIAL and which may be proprietary to ECI Telecom. If
            you have received this
            <br>
            transmission in error, please inform us by e-mail, phone or
            fax, and then delete the original
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___________________________________________________________________________<o:p></o:p></span></p>
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    </blockquote>
    <br>
  </body>
</html>

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Kamran Raza (skraza)" <skraza@cisco.com>, "draft-ietf-mpls-mldp-yang@ietf.org" <draft-ietf-mpls-mldp-yang@ietf.org>
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Thread-Topic: mLDP YANG ID rev -05 uploaded [Re: [mpls] YANG Doctor Early Review for "YANG Data Model for MPLS mLDP" - draft-ietf-mpls-mldp-yang-03]
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Cc: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, draft-ietf-mpls-sfc@ietf.org, Deborah A Brungard <db3546@att.com>
From: Loa Andersson <loa@pi.nu>
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Subject: [mpls] MPLS working group last call on draft-ietf-mpls-sfc
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Working Group,

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

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

There are no IPR disclosures against draft-ietf-mpls-sfc.

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 document.

This working group last call ends October 14, 2018.


/Loa
mpls wg co-chair
-- 


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


From nobody Tue Oct 30 03:52:14 2018
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From: Loa Andersson <loa@pi.nu>
To: "mpls@ietf.org" <mpls@ietf.org>
Cc: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, draft-ietf-mpls-sfc@ietf.org
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Subject: [mpls] Correction: MPLS working group last call on draft-ietf-mpls-sfc
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WG,

One typo - the wglc ends November 14, 2018.

/Loa

On 2018-10-30 18:36, Loa Andersson wrote:
> 
> Working Group,
> 
> This is to initiate a two week working group last call on draft-
> ietf-mpls-sfc.
> 
> Please send your comments to the mpls wg mailing list (mpls@ietf.org).
> 
> There are no IPR disclosures against draft-ietf-mpls-sfc.
> 
> 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 document.
> 
> This working group last call ends October 14, 2018.
> 
> 
> /Loa
> mpls wg co-chair

-- 


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


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Subject: Re: [mpls] MPLS working group last call on draft-ietf-mpls-sfc
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Hi Loa,

> This working group last call ends October 14, 2018.

Unlikely :-)

November?

A


From nobody Tue Oct 30 04:02:58 2018
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Adrian,

Yes - I beat you to it? Sent a correctioon mail :).

/Loa

On 2018-10-30 18:53, Adrian Farrel wrote:
> Hi Loa,
> 
>> This working group last call ends October 14, 2018.
> 
> Unlikely :-)
> 
> November?
> 
> A
> 

-- 


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


From nobody Tue Oct 30 06:23:29 2018
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Date: Tue, 30 Oct 2018 09:23:11 -0400
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--00000000000002bc3f057972179e
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Loa,

This draft has been through a lot of discussion and updates (some of those
in almost real time at IETF 102 :-). I believe that it is now ready for WG
LC.

Cheers,
Andy


On Tue, Oct 30, 2018 at 6:52 AM Loa Andersson <loa@pi.nu> wrote:

> WG,
>
> One typo - the wglc ends November 14, 2018.
>
> /Loa
>
> On 2018-10-30 18:36, Loa Andersson wrote:
> >
> > Working Group,
> >
> > This is to initiate a two week working group last call on draft-
> > ietf-mpls-sfc.
> >
> > Please send your comments to the mpls wg mailing list (mpls@ietf.org).
> >
> > There are no IPR disclosures against draft-ietf-mpls-sfc.
> >
> > 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 document.
> >
> > This working group last call ends October 14, 2018.
> >
> >
> > /Loa
> > mpls wg co-chair
>
> --
>
>
> Loa Andersson                        email: loa@pi.nu
> Senior MPLS Expert
> Bronze Dragon Consulting             phone: +46 739 81 21 64
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

--00000000000002bc3f057972179e
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<div dir=3D"ltr">Loa,<div><br></div><div>This draft has been through a lot =
of discussion and updates (some of those in almost real time at IETF 102 :-=
). I believe that it is now ready for WG LC.</div><div><br></div><div>Cheer=
s,</div><div>Andy</div><div><br></div></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr">On Tue, Oct 30, 2018 at 6:52 AM Loa Andersson &lt;<a href=
=3D"mailto:loa@pi.nu">loa@pi.nu</a>&gt; wrote:<br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex">WG,<br>
<br>
One typo - the wglc ends November 14, 2018.<br>
<br>
/Loa<br>
<br>
On 2018-10-30 18:36, Loa Andersson wrote:<br>
&gt; <br>
&gt; Working Group,<br>
&gt; <br>
&gt; This is to initiate a two week working group last call on draft-<br>
&gt; ietf-mpls-sfc.<br>
&gt; <br>
&gt; Please send your comments to the mpls wg mailing list (<a href=3D"mail=
to:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a>).<br>
&gt; <br>
&gt; There are no IPR disclosures against draft-ietf-mpls-sfc.<br>
&gt; <br>
&gt; All the authors and contributors have stated on the working group<br>
&gt; mailing list that they are not aware of any other IPRs that relates<br=
>
&gt; to this document.<br>
&gt; <br>
&gt; This working group last call ends October 14, 2018.<br>
&gt; <br>
&gt; <br>
&gt; /Loa<br>
&gt; mpls wg co-chair<br>
<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@pi.nu" target=3D"_blank"=
>loa@pi.nu</a><br>
Senior MPLS Expert<br>
Bronze Dragon Consulting=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pho=
ne: +46 739 81 21 64<br>
<br>
_______________________________________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/mpls</a><br>
</blockquote></div>

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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Tue, 30 Oct 2018 09:24:58 -0400
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To: Loa Andersson <loa@pi.nu>
Cc: mpls@ietf.org, mpls-chairs <mpls-chairs@ietf.org>, draft-ietf-mpls-sfc@ietf.org
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Subject: Re: [mpls] Correction: MPLS working group last call on draft-ietf-mpls-sfc
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Loa,

Let me update that - we're already in last call, of course. What I meant to
type was that this draft has been through a lot of discussion and updates,
and I believe that it is now ready for publication.

Obviously I haven't had enough caffeine yet this morning ... :-)

Cheers,
Andy


On Tue, Oct 30, 2018 at 9:23 AM Andrew G. Malis <agmalis@gmail.com> wrote:

> Loa,
>
> This draft has been through a lot of discussion and updates (some of those
> in almost real time at IETF 102 :-). I believe that it is now ready for WG
> LC.
>
> Cheers,
> Andy
>
>
> On Tue, Oct 30, 2018 at 6:52 AM Loa Andersson <loa@pi.nu> wrote:
>
>> WG,
>>
>> One typo - the wglc ends November 14, 2018.
>>
>> /Loa
>>
>> On 2018-10-30 18:36, Loa Andersson wrote:
>> >
>> > Working Group,
>> >
>> > This is to initiate a two week working group last call on draft-
>> > ietf-mpls-sfc.
>> >
>> > Please send your comments to the mpls wg mailing list (mpls@ietf.org).
>> >
>> > There are no IPR disclosures against draft-ietf-mpls-sfc.
>> >
>> > 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 document.
>> >
>> > This working group last call ends October 14, 2018.
>> >
>> >
>> > /Loa
>> > mpls wg co-chair
>>
>> --
>>
>>
>> Loa Andersson                        email: loa@pi.nu
>> Senior MPLS Expert
>> Bronze Dragon Consulting             phone: +46 739 81 21 64
>>
>> _______________________________________________
>> mpls mailing list
>> mpls@ietf.org
>> https://www.ietf.org/mailman/listinfo/mpls
>>
>

--00000000000064bfc80579721d75
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<div dir=3D"ltr">Loa,<div><br></div><div>Let me update that - we&#39;re alr=
eady in last call, of course. What I meant to type was that this draft has =
been through a lot of discussion and updates, and I believe that it is now =
ready for publication.=C2=A0</div><div><br></div><div>Obviously I haven&#39=
;t had enough caffeine yet this morning ... :-)</div><div><br></div><div>Ch=
eers,</div><div>Andy</div><div><br></div></div><br><div class=3D"gmail_quot=
e"><div dir=3D"ltr">On Tue, Oct 30, 2018 at 9:23 AM Andrew G. Malis &lt;<a =
href=3D"mailto:agmalis@gmail.com">agmalis@gmail.com</a>&gt; wrote:<br></div=
><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1=
px #ccc solid;padding-left:1ex"><div dir=3D"ltr">Loa,<div><br></div><div>Th=
is draft has been through a lot of discussion and updates (some of those in=
 almost real time at IETF 102 :-). I believe that it is now ready for WG LC=
.</div><div><br></div><div>Cheers,</div><div>Andy</div><div><br></div></div=
><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Tue, Oct 30, 2018 at 6:=
52 AM Loa Andersson &lt;<a href=3D"mailto:loa@pi.nu" target=3D"_blank">loa@=
pi.nu</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"ma=
rgin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">WG,<br>
<br>
One typo - the wglc ends November 14, 2018.<br>
<br>
/Loa<br>
<br>
On 2018-10-30 18:36, Loa Andersson wrote:<br>
&gt; <br>
&gt; Working Group,<br>
&gt; <br>
&gt; This is to initiate a two week working group last call on draft-<br>
&gt; ietf-mpls-sfc.<br>
&gt; <br>
&gt; Please send your comments to the mpls wg mailing list (<a href=3D"mail=
to:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a>).<br>
&gt; <br>
&gt; There are no IPR disclosures against draft-ietf-mpls-sfc.<br>
&gt; <br>
&gt; All the authors and contributors have stated on the working group<br>
&gt; mailing list that they are not aware of any other IPRs that relates<br=
>
&gt; to this document.<br>
&gt; <br>
&gt; This working group last call ends October 14, 2018.<br>
&gt; <br>
&gt; <br>
&gt; /Loa<br>
&gt; mpls wg co-chair<br>
<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@pi.nu" target=3D"_blank"=
>loa@pi.nu</a><br>
Senior MPLS Expert<br>
Bronze Dragon Consulting=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pho=
ne: +46 739 81 21 64<br>
<br>
_______________________________________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/mpls</a><br>
</blockquote></div>
</blockquote></div>

--00000000000064bfc80579721d75--


From nobody Tue Oct 30 08:05:48 2018
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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Tue, 30 Oct 2018 08:05:28 -0700
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To: "Andrew G. Malis" <agmalis@gmail.com>
Cc: mpls-chairs@ietf.org, draft-mirsky-mpls-p2mp-bfd@ietf.org, mpls@ietf.org
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Subject: Re: [mpls] MPLS-RT review of draft-mirsky-mpls-p2mp-bfd-04
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Dear Andy,
thank you for the review and the detailed suggestions. Attached please find
the updated version of the draft and the diff to highlight the proposed
changes. Please let me know if these address your comments.

Kind regards,
Greg

On Wed, Oct 24, 2018 at 11:11 AM Greg Mirsky <gregimirsky@gmail.com> wrote:

> Dear Andy,
> thank you for your thorough review and the most helpful comments. I'll
> work on the update to address them.
>
> Regards,
> Greg
>
> On Wed, Oct 24, 2018 at 9:17 AM Andrew G. Malis <agmalis@gmail.com> wrote=
:
>
>> I=E2=80=99ve been selected as an MPLS-RT reviewer for
>> draft-mirsky-mpls-p2mp-bfd-04, which is currently a candidate for MPLS W=
G
>> adoption. This draft documents procedures for using BFD for multipoint
>> networks to detect data plane failures in MPLS p2mp LSPs.
>>
>> The BFD WG has been working on draft-ietf-bfd-multipoint, which describe=
s
>> BFD procedures for multipoint and multicast networks.
>> draft-mirsky-mpls-p2mp-bfd uses that draft as a basis to detect MPLS dat=
a
>> plane failures for p2mp LSPs. This is a straightforward and useful
>> application of the BFD draft for MPLS data plane failure detection.
>>
>> However, I would have expected to see at least a reference to RFC 4687,
>> "Operations and Management (OAM) Requirements for Point-to-Multipoint MP=
LS
>> Networks", and some text on how this draft addresses the requirements in
>> that draft.
>>
>> I also expected more text on the relationship between this draft and RFC
>> 6425, "Detecting Data-Plane Failures in Point-to-Multipoint MPLS -
>> Extensions to LSP Ping"', and more of an explanation of why the keyword =
MAY
>> is used in sections 4.1 and 4.2 - what are the implications of following=
 or
>> not following the MAY in each case?
>>
>> The draft also needs an editing pass, for example "MaultipointHead" for =
"MultipointHead"
>> and some incorrect English grammar in several places.
>>
>> Once these items have been addressed, I think that the draft should be
>> ready for an adoption call.
>>
>> Cheers,
>> Andy
>>
>>
>>

--000000000000a926730579738479
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<div dir=3D"ltr">Dear Andy,<div>thank you for the review and the detailed s=
uggestions. Attached please find the updated version of the draft and the d=
iff to highlight the proposed changes. Please let me know if these address =
your comments.</div><div><br></div><div>Kind regards,</div><div>Greg</div><=
/div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Wed, Oct 24, 2018 a=
t 11:11 AM Greg Mirsky &lt;<a href=3D"mailto:gregimirsky@gmail.com">gregimi=
rsky@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" st=
yle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div =
dir=3D"ltr">Dear Andy,<div>thank you for your thorough review and the most =
helpful comments. I&#39;ll work on the update to address them.</div><div><b=
r></div><div>Regards,</div><div>Greg</div></div><br><div class=3D"gmail_quo=
te"><div dir=3D"ltr">On Wed, Oct 24, 2018 at 9:17 AM Andrew G. Malis &lt;<a=
 href=3D"mailto:agmalis@gmail.com" target=3D"_blank">agmalis@gmail.com</a>&=
gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0=
 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div di=
r=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"lt=
r">I=E2=80=99ve been selected as an=C2=A0<span class=3D"m_72065697830124497=
96m_-1369470530874045245gmail-il">MPLS</span>-<span class=3D"m_720656978301=
2449796m_-1369470530874045245gmail-il">RT</span>=C2=A0reviewer for draft-mi=
rsky-mpls-p2mp-bfd-04, which is currently a candidate for=C2=A0<span class=
=3D"m_7206569783012449796m_-1369470530874045245gmail-il">MPLS</span>=C2=A0W=
G adoption. This draft documents procedures for using BFD for multipoint ne=
tworks to detect data plane failures in MPLS p2mp LSPs.<div><br></div><div>=
The BFD WG has been working on=C2=A0draft-ietf-bfd-multipoint, which descri=
bes BFD procedures for multipoint and multicast networks. draft-mirsky-mpls=
-p2mp-bfd uses that draft as a basis to detect MPLS data plane failures for=
 p2mp LSPs. This is a straightforward and useful application of the BFD dra=
ft for MPLS data plane failure detection.</div><div><br></div><div>However,=
 I would have expected to see at least a reference to RFC 4687, &quot;Opera=
tions and Management (OAM) Requirements for Point-to-Multipoint MPLS Networ=
ks&quot;, and some text on how this draft addresses the requirements in tha=
t draft.</div><div><br></div><div>I also expected more text on the relation=
ship between this draft and RFC 6425, &quot;Detecting Data-Plane Failures i=
n Point-to-Multipoint MPLS - Extensions to LSP Ping&quot;&#39;, and more of=
 an explanation of why the keyword MAY is used in sections 4.1 and 4.2 - wh=
at are the implications of following or not following the MAY in each case?=
</div><div><br></div><div>The draft also needs an editing pass, for example=
 &quot;<span style=3D"color:rgb(0,0,0);font-size:13.3333px">MaultipointHead=
&quot; for &quot;</span><span style=3D"color:rgb(0,0,0);font-size:13.3333px=
">MultipointHead&quot; and some incorrect English grammar in several places=
.</span></div><div><br></div><div>Once these items have been addressed, I t=
hink that the draft should be ready for an adoption call.</div><div><br></d=
iv><div>Cheers,</div><div>Andy</div><div><br></div><div><span style=3D"colo=
r:rgb(0,0,0);font-size:13.3333px"><br></span></div></div></div></div></div>=
</div></div>
</blockquote></div>
</blockquote></div>

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From: Kireeti Kompella <kireeti.kompella@gmail.com>
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Date: Tue, 30 Oct 2018 08:49:56 -0700
Cc: "mpls@ietf.org" <mpls@ietf.org>, "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "draft-ietf-mpls-rmr@ietf.org" <draft-ietf-mpls-rmr@ietf.org>, Deborah A Brungard <db3546@att.com>
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To: Loa Andersson <loa@pi.nu>
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Subject: Re: [mpls] IPR poll on draft-ietf-mpls-rmr
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Hi,

Junkper has filed an IPR statement on draft-kompella-mpls-rmr.  It applies t=
o draft-ietf-mpls-rmr as is.  I=E2=80=99m working on moving it to the WG doc=
.  In addition, Juniper has filed statements on draft-esale-ldp-rmr-extensio=
ns, draft-deshmukh-teas-rsvp-rmr-extension and draft-zzhang-rmr-rsvp-p2mp.=20=


I know of no other IPR related to draft-ietf-mpls-rmr. =20

Kireeti

> On Oct 23, 2018, at 00:14, Loa Andersson <loa@pi.nu> wrote:
>=20
> Working Group,
>=20
> We are currently preparing draft draft-ietf-mpls-rmr for working
> group last call.
>=20
> Part of this preparation is to do an IPR poll.
>=20
> This mail is to start the IPR poll.
>=20
> Are you aware of any IPR that applies to draft-ietf-mpls-rmr?
>=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
> There is one IPR disclosures directly against draft-ietf-mpls-rmr.
>=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
> mpls wg co-chair
> --=20
>=20
>=20
> Loa Andersson                        email: loa@pi.nu
> Senior MPLS Expert
> Bronze Dragon Consulting             phone: +46 739 81 21 64

--Apple-Mail-BDC7BEAF-821A-4E8D-B8CE-FADFAE50F129
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div dir=3D"ltr"><span></span></div><div di=
r=3D"ltr">Hi,<div><br></div><div>Junkper has filed an IPR statement on draft=
-kompella-mpls-rmr. &nbsp;It applies to draft-ietf-mpls-rmr as is. &nbsp;I=E2=
=80=99m working on moving it to the WG doc. &nbsp;In addition, Juniper has f=
iled statements on&nbsp;<i style=3D"box-sizing: border-box; font-weight: bol=
d; background-color: rgba(255, 255, 255, 0);">draft-esale-ldp-rmr-extensions=
,&nbsp;</i><i style=3D"box-sizing: border-box; font-weight: bold; background=
-color: rgba(255, 255, 255, 0);">draft-deshmukh-teas-rsvp-rmr-extension </i>=
<span style=3D"box-sizing: border-box; background-color: rgba(255, 255, 255,=
 0);">and</span><i style=3D"box-sizing: border-box; font-weight: bold; backg=
round-color: rgba(255, 255, 255, 0);">&nbsp;</i><i style=3D"box-sizing: bord=
er-box; font-weight: bold; background-color: rgba(255, 255, 255, 0);">draft-=
zzhang-rmr-rsvp-p2mp.&nbsp;</i></div><div><br></div><div>I know of no other I=
PR related to draft-ietf-mpls-rmr. &nbsp;<br><br><div id=3D"AppleMailSignatu=
re" dir=3D"ltr">Kireeti</div><div dir=3D"ltr"><br>On Oct 23, 2018, at 00:14,=
 Loa Andersson &lt;<a href=3D"mailto:loa@pi.nu">loa@pi.nu</a>&gt; wrote:<br>=
<br></div><blockquote type=3D"cite"><div dir=3D"ltr"><span>Working Group,</s=
pan><br><span></span><br><span>We are currently preparing draft draft-ietf-m=
pls-rmr for working</span><br><span>group last call.</span><br><span></span>=
<br><span>Part of this preparation is to do an IPR poll.</span><br><span></s=
pan><br><span>This mail is to start the IPR poll.</span><br><span></span><br=
><span>Are you aware of any IPR that applies to draft-ietf-mpls-rmr?</span><=
br><span></span><br><span>If so, has this IPR been disclosed in compliance w=
ith IETF IPR rules</span><br><span>(see RFCs 3979, 4879, 3669 and 5378 for m=
ore details).</span><br><span></span><br><span>There is one IPR disclosures d=
irectly against draft-ietf-mpls-rmr.</span><br><span></span><br><span>If you=
 are listed as a document author or contributor please respond to</span><br>=
<span>this email regardless of whether or not you are aware of any relevant<=
/span><br><span>IPR. *The response needs to be sent to the MPLS WG mailing l=
ist.* The</span><br><span>document will not advance to the next stage until a=
 response has been</span><br><span>received from each author and contributor=
.</span><br><span></span><br><span>If you are on the MPLS WG email list but a=
re not listed as an author or</span><br><span>contributor, then please expli=
citly respond only if you are aware of any</span><br><span>IPR that has not y=
et been disclosed in conformance with IETF rules.</span><br><span></span><br=
><span></span><br><span>/Loa</span><br><span> mpls wg co-chair</span><br><sp=
an>-- </span><br><span></span><br><span></span><br><span>Loa Andersson &nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;email: <a href=3D"m=
ailto:loa@pi.nu">loa@pi.nu</a></span><br><span>Senior MPLS Expert</span><br>=
<span>Bronze Dragon Consulting &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;phone: +46 739 81 21 64</span><br></div></blockqu=
ote></div></div></body></html>=

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From: John E Drake <jdrake@juniper.net>
To: Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>
CC: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "draft-ietf-mpls-sfc@ietf.org" <draft-ietf-mpls-sfc@ietf.org>, Deborah A Brungard <db3546@att.com>
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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Tue, 30 Oct 2018 13:24:46 -0700
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To: Loa Andersson <loa@pi.nu>
Cc: mpls@ietf.org, mpls-chairs@ietf.org, draft-ietf-mpls-sfc@ietf.org
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Subject: Re: [mpls] Correction: MPLS working group last call on draft-ietf-mpls-sfc
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yes/support the publication of this document.

Regards,
Greg

On Tue, Oct 30, 2018 at 3:52 AM Loa Andersson <loa@pi.nu> wrote:

> WG,
>
> One typo - the wglc ends November 14, 2018.
>
> /Loa
>
> On 2018-10-30 18:36, Loa Andersson wrote:
> >
> > Working Group,
> >
> > This is to initiate a two week working group last call on draft-
> > ietf-mpls-sfc.
> >
> > Please send your comments to the mpls wg mailing list (mpls@ietf.org).
> >
> > There are no IPR disclosures against draft-ietf-mpls-sfc.
> >
> > 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 document.
> >
> > This working group last call ends October 14, 2018.
> >
> >
> > /Loa
> > mpls wg co-chair
>
> --
>
>
> Loa Andersson                        email: loa@pi.nu
> Senior MPLS Expert
> Bronze Dragon Consulting             phone: +46 739 81 21 64
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
>

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<div dir=3D"ltr">yes/support the publication of this document.<div><br></di=
v><div>Regards,</div><div>Greg</div></div><br><div class=3D"gmail_quote"><d=
iv dir=3D"ltr">On Tue, Oct 30, 2018 at 3:52 AM Loa Andersson &lt;<a href=3D=
"mailto:loa@pi.nu">loa@pi.nu</a>&gt; wrote:<br></div><blockquote class=3D"g=
mail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-l=
eft:1ex">WG,<br>
<br>
One typo - the wglc ends November 14, 2018.<br>
<br>
/Loa<br>
<br>
On 2018-10-30 18:36, Loa Andersson wrote:<br>
&gt; <br>
&gt; Working Group,<br>
&gt; <br>
&gt; This is to initiate a two week working group last call on draft-<br>
&gt; ietf-mpls-sfc.<br>
&gt; <br>
&gt; Please send your comments to the mpls wg mailing list (<a href=3D"mail=
to:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a>).<br>
&gt; <br>
&gt; There are no IPR disclosures against draft-ietf-mpls-sfc.<br>
&gt; <br>
&gt; All the authors and contributors have stated on the working group<br>
&gt; mailing list that they are not aware of any other IPRs that relates<br=
>
&gt; to this document.<br>
&gt; <br>
&gt; This working group last call ends October 14, 2018.<br>
&gt; <br>
&gt; <br>
&gt; /Loa<br>
&gt; mpls wg co-chair<br>
<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@pi.nu" target=3D"_blank"=
>loa@pi.nu</a><br>
Senior MPLS Expert<br>
Bronze Dragon Consulting=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pho=
ne: +46 739 81 21 64<br>
<br>
_______________________________________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org" target=3D"_blank">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/mpls</a><br>
</blockquote></div>

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From: Jeff Tantsura <jefftant.ietf@gmail.com>
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Date: Tue, 30 Oct 2018 19:54:46 -0700
Cc: "mpls@ietf.org" <mpls@ietf.org>, "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "draft-ietf-mpls-sfc@ietf.org" <draft-ietf-mpls-sfc@ietf.org>
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To: Loa Andersson <loa@pi.nu>
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Subject: Re: [mpls] MPLS working group last call on draft-ietf-mpls-sfc
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Yes/support=20

Regards,
Jeff

>> -----Original Message-----
>> From: Loa Andersson <loa@pi.nu>
>> Sent: Tuesday, October 30, 2018 6:36 AM
>> To: mpls@ietf.org
>> Cc: mpls-chairs@ietf.org; draft-ietf-mpls-sfc@ietf.org; Deborah A Brungar=
d
>> <db3546@att.com>
>> Subject: MPLS working group last call on draft-ietf-mpls-sfc
>>=20
>>=20
>> Working Group,
>>=20
>> This is to initiate a two week working group last call on draft- ietf-mpl=
s-sfc.
>>=20
>> Please send your comments to the mpls wg mailing list (mpls@ietf.org).
>>=20
>> There are no IPR disclosures against draft-ietf-mpls-sfc.
>>=20
>> 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 document.
>>=20
>> This working group last call ends October 14, 2018.
>>=20
>>=20
>> /Loa
>> mpls wg co-chair
>> --
>>=20
>>=20
>> Loa Andersson                        email: loa@pi.nu
>> Senior MPLS Expert
>> Bronze Dragon Consulting             phone: +46 739 81 21 64
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls


From nobody Tue Oct 30 23:56:33 2018
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From: Loa Andersson <loa@pi.nu>
To: "mpls@ietf.org" <mpls@ietf.org>
Cc: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "draft-malis-mpls-sfc-encapsulation@ietf.org" <draft-malis-mpls-sfc-encapsulation@ietf.org>
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Subject: [mpls] Closed: Working Group Adoption poll on draft-malis-mpls-sfc-encapsulation
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Working Group,

This working adoption poll is closed, and we have a new working group
document.

As soon as the cut off lifts, can the authors plz post
draft-ieft-mpls-sfc-encapsulation
without any other changes than adminstrativia.

/Loa
for the MPLS wg chairs


On 2018-10-16 00:47, Loa Andersson wrote:
> Working Group,
> 
> This is to start a two week poll on adopting
> draft-malis-mpls-sfc-encapsulation
> as a 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 against this document.
> 
> The authors have all stated on the MPLS wg mailing list that they are
> unaware of any IPRs that relate to this document.
> 
> The working group adoption poll ends October 30, 2018.
> 
> /Loa
> mpls wg co-chair

-- 


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


From nobody Wed Oct 31 06:41:06 2018
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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Wed, 31 Oct 2018 09:40:49 -0400
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Greg,

Thanks for checking.

You didn't really address my comment: "I would have expected to see at
least a reference to RFC 4687, "Operations and Management (OAM)
Requirements for Point-to-Multipoint MPLS Networks", and some text on how
this draft addresses the requirements in that draft.".

You added a reference in the security section, but nothing about how your
draft addresses the 4687 requirements.

Also, you didn't really address my next comment: "I also expected more text
on the relationship between this draft and RFC 6425, "Detecting Data-Plane
Failures in Point-to-Multipoint MPLS - Extensions to LSP Ping"', and more
of an explanation of why the keyword MAY is used in sections 4.1 and 4.2 -
what are the implications of following or not following the MAY in each
case?"

Regarding RFC 6425, I was looking for text along the lines of why one would
choose to implement this draft rather than 6425 (or both), to give product
implementers and network operators guidance on whether to use 6425, this
draft, or both for MPLS p2mp data plane failure detection. Otherwise, why
would they bother with this draft when they already have 6425 working?

Also, in sections 4.1 and 4.2, you just added another MAY to section 4.1,
but again, what happens if you don't do the MAYs in both sections? Why
would I want to do the MAYs? Why would I not want to? The text doesn't say.

Finally, in section 3, the following sentence doesn't scan:

   The source IP
   address MAY be drawn from the IP header if BFD control packet
   transmitted by the head using IP/UDP encapsulation as described in
   Section 3.1.

Did you mean "uses" instead of "using"?

Thanks,
Andy





On Tue, Oct 30, 2018 at 11:05 AM Greg Mirsky <gregimirsky@gmail.com> wrote:

> Dear Andy,
> thank you for the review and the detailed suggestions. Attached please
> find the updated version of the draft and the diff to highlight the
> proposed changes. Please let me know if these address your comments.
>
> Kind regards,
> Greg
>
> On Wed, Oct 24, 2018 at 11:11 AM Greg Mirsky <gregimirsky@gmail.com>
> wrote:
>
>> Dear Andy,
>> thank you for your thorough review and the most helpful comments. I'll
>> work on the update to address them.
>>
>> Regards,
>> Greg
>>
>> On Wed, Oct 24, 2018 at 9:17 AM Andrew G. Malis <agmalis@gmail.com>
>> wrote:
>>
>>> I=E2=80=99ve been selected as an MPLS-RT reviewer for
>>> draft-mirsky-mpls-p2mp-bfd-04, which is currently a candidate for MPLS =
WG
>>> adoption. This draft documents procedures for using BFD for multipoint
>>> networks to detect data plane failures in MPLS p2mp LSPs.
>>>
>>> The BFD WG has been working on draft-ietf-bfd-multipoint, which
>>> describes BFD procedures for multipoint and multicast networks.
>>> draft-mirsky-mpls-p2mp-bfd uses that draft as a basis to detect MPLS da=
ta
>>> plane failures for p2mp LSPs. This is a straightforward and useful
>>> application of the BFD draft for MPLS data plane failure detection.
>>>
>>> However, I would have expected to see at least a reference to RFC 4687,
>>> "Operations and Management (OAM) Requirements for Point-to-Multipoint M=
PLS
>>> Networks", and some text on how this draft addresses the requirements i=
n
>>> that draft.
>>>
>>> I also expected more text on the relationship between this draft and RF=
C
>>> 6425, "Detecting Data-Plane Failures in Point-to-Multipoint MPLS -
>>> Extensions to LSP Ping"', and more of an explanation of why the keyword=
 MAY
>>> is used in sections 4.1 and 4.2 - what are the implications of followin=
g or
>>> not following the MAY in each case?
>>>
>>> The draft also needs an editing pass, for example "MaultipointHead" for
>>> "MultipointHead" and some incorrect English grammar in several places.
>>>
>>> Once these items have been addressed, I think that the draft should be
>>> ready for an adoption call.
>>>
>>> Cheers,
>>> Andy
>>>
>>>
>>>

--000000000000ea7fdd0579867348
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr">Greg,<div><br></div><div>Thanks for check=
ing.</div><div><br></div><div>You didn&#39;t really address my comment: &qu=
ot;I would have expected to see at least a reference to RFC 4687, &quot;Ope=
rations and Management (OAM) Requirements for Point-to-Multipoint MPLS Netw=
orks&quot;, and some text on how this draft addresses the requirements in t=
hat draft.&quot;.=C2=A0</div><div><br></div><div>You added a reference in t=
he security section, but nothing about how your draft addresses the 4687 re=
quirements.</div><div><br></div><div>Also, you didn&#39;t really address my=
 next comment: &quot;I also expected more text on the relationship between =
this draft and RFC 6425, &quot;Detecting Data-Plane Failures in Point-to-Mu=
ltipoint MPLS - Extensions to LSP Ping&quot;&#39;, and more of an explanati=
on of why the keyword MAY is used in sections 4.1 and 4.2 - what are the im=
plications of following or not following the MAY in each case?&quot;<br></d=
iv><div><br></div><div>Regarding RFC 6425, I was looking for text along the=
 lines of why one would choose to implement this draft rather than 6425 (or=
 both), to give product implementers and network operators guidance on whet=
her to use 6425, this draft, or both for MPLS p2mp data plane failure detec=
tion. Otherwise, why would they bother with this draft when they already ha=
ve 6425 working?</div><div><br></div><div>Also, in sections 4.1 and 4.2, yo=
u just added another MAY to section 4.1, but again, what happens if you don=
&#39;t do the MAYs in both sections? Why would I want to do the MAYs? Why w=
ould I not want to? The text doesn&#39;t say.</div><div><br></div><div>Fina=
lly, in section 3, the following sentence doesn&#39;t scan:</div><div><br><=
/div><div><div>=C2=A0 =C2=A0The source IP</div><div>=C2=A0 =C2=A0address MA=
Y be drawn from the IP header if BFD control packet</div><div>=C2=A0 =C2=A0=
transmitted by the head using IP/UDP encapsulation as described in</div><di=
v>=C2=A0 =C2=A0Section 3.1.</div></div><div><br></div><div>Did you mean &qu=
ot;uses&quot; instead of &quot;using&quot;?</div><div><br></div><div>Thanks=
,</div><div>Andy</div><div><br></div><div><br></div><div><br></div><div><br=
></div></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Tue, =
Oct 30, 2018 at 11:05 AM Greg Mirsky &lt;<a href=3D"mailto:gregimirsky@gmai=
l.com">gregimirsky@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"g=
mail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-l=
eft:1ex"><div dir=3D"ltr">Dear Andy,<div>thank you for the review and the d=
etailed suggestions. Attached please find the updated version of the draft =
and the diff to highlight the proposed changes. Please let me know if these=
 address your comments.</div><div><br></div><div>Kind regards,</div><div>Gr=
eg</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Wed, Oct 2=
4, 2018 at 11:11 AM Greg Mirsky &lt;<a href=3D"mailto:gregimirsky@gmail.com=
" target=3D"_blank">gregimirsky@gmail.com</a>&gt; wrote:<br></div><blockquo=
te class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc so=
lid;padding-left:1ex"><div dir=3D"ltr">Dear Andy,<div>thank you for your th=
orough review and the most helpful comments. I&#39;ll work on the update to=
 address them.</div><div><br></div><div>Regards,</div><div>Greg</div></div>=
<br><div class=3D"gmail_quote"><div dir=3D"ltr">On Wed, Oct 24, 2018 at 9:1=
7 AM Andrew G. Malis &lt;<a href=3D"mailto:agmalis@gmail.com" target=3D"_bl=
ank">agmalis@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_q=
uote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1e=
x"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div=
 dir=3D"ltr"><div dir=3D"ltr">I=E2=80=99ve been selected as an=C2=A0<span c=
lass=3D"m_4836479175083463128m_7206569783012449796m_-1369470530874045245gma=
il-il">MPLS</span>-<span class=3D"m_4836479175083463128m_720656978301244979=
6m_-1369470530874045245gmail-il">RT</span>=C2=A0reviewer for draft-mirsky-m=
pls-p2mp-bfd-04, which is currently a candidate for=C2=A0<span class=3D"m_4=
836479175083463128m_7206569783012449796m_-1369470530874045245gmail-il">MPLS=
</span>=C2=A0WG adoption. This draft documents procedures for using BFD for=
 multipoint networks to detect data plane failures in MPLS p2mp LSPs.<div><=
br></div><div>The BFD WG has been working on=C2=A0draft-ietf-bfd-multipoint=
, which describes BFD procedures for multipoint and multicast networks. dra=
ft-mirsky-mpls-p2mp-bfd uses that draft as a basis to detect MPLS data plan=
e failures for p2mp LSPs. This is a straightforward and useful application =
of the BFD draft for MPLS data plane failure detection.</div><div><br></div=
><div>However, I would have expected to see at least a reference to RFC 468=
7, &quot;Operations and Management (OAM) Requirements for Point-to-Multipoi=
nt MPLS Networks&quot;, and some text on how this draft addresses the requi=
rements in that draft.</div><div><br></div><div>I also expected more text o=
n the relationship between this draft and RFC 6425, &quot;Detecting Data-Pl=
ane Failures in Point-to-Multipoint MPLS - Extensions to LSP Ping&quot;&#39=
;, and more of an explanation of why the keyword MAY is used in sections 4.=
1 and 4.2 - what are the implications of following or not following the MAY=
 in each case?</div><div><br></div><div>The draft also needs an editing pas=
s, for example &quot;<span style=3D"color:rgb(0,0,0);font-size:13.3333px">M=
aultipointHead&quot; for &quot;</span><span style=3D"color:rgb(0,0,0);font-=
size:13.3333px">MultipointHead&quot; and some incorrect English grammar in =
several places.</span></div><div><br></div><div>Once these items have been =
addressed, I think that the draft should be ready for an adoption call.</di=
v><div><br></div><div>Cheers,</div><div>Andy</div><div><br></div><div><span=
 style=3D"color:rgb(0,0,0);font-size:13.3333px"><br></span></div></div></di=
v></div></div></div></div>
</blockquote></div>
</blockquote></div>
</blockquote></div>

--000000000000ea7fdd0579867348--


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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Wed, 31 Oct 2018 09:43:24 -0400
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To: Loa Andersson <loa@pi.nu>
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Subject: Re: [mpls] Closed: Working Group Adoption poll on draft-malis-mpls-sfc-encapsulation
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--0000000000002854a60579867ded
Content-Type: text/plain; charset="UTF-8"

Loa,

I'll take care of it early next week.

Thanks,
Andy


On Wed, Oct 31, 2018 at 2:56 AM Loa Andersson <loa@pi.nu> wrote:

> Working Group,
>
> This working adoption poll is closed, and we have a new working group
> document.
>
> As soon as the cut off lifts, can the authors plz post
> draft-ieft-mpls-sfc-encapsulation
> without any other changes than adminstrativia.
>
> /Loa
> for the MPLS wg chairs
>
>
> On 2018-10-16 00:47, Loa Andersson wrote:
> > Working Group,
> >
> > This is to start a two week poll on adopting
> > draft-malis-mpls-sfc-encapsulation
> > as a 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 against this document.
> >
> > The authors have all stated on the MPLS wg mailing list that they are
> > unaware of any IPRs that relate to this document.
> >
> > The working group adoption poll ends October 30, 2018.
> >
> > /Loa
> > mpls wg co-chair
>
> --
>
>
> Loa Andersson                        email: loa@pi.nu
> Senior MPLS Expert
> Bronze Dragon Consulting             phone: +46 739 81 21 64
>

--0000000000002854a60579867ded
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Loa,<div><br></div><div>I&#39;ll take care of it early nex=
t week.</div><div><br></div><div>Thanks,</div><div>Andy</div><div><br></div=
></div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Wed, Oct 31, 2018=
 at 2:56 AM Loa Andersson &lt;<a href=3D"mailto:loa@pi.nu">loa@pi.nu</a>&gt=
; wrote:<br></div><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 working adoption poll is closed, and we have a new working group<br>
document.<br>
<br>
As soon as the cut off lifts, can the authors plz post<br>
draft-ieft-mpls-sfc-encapsulation<br>
without any other changes than adminstrativia.<br>
<br>
/Loa<br>
for the MPLS wg chairs<br>
<br>
<br>
On 2018-10-16 00:47, Loa Andersson wrote:<br>
&gt; Working Group,<br>
&gt; <br>
&gt; This is to start a two week poll on adopting<br>
&gt; draft-malis-mpls-sfc-encapsulation<br>
&gt; as a MPLS working group document.<br>
&gt; <br>
&gt; Please send your comments (support/not support) to the mpls working<br=
>
&gt; group mailing list (<a href=3D"mailto:mpls@ietf.org" target=3D"_blank"=
>mpls@ietf.org</a>). Please give a technical<br>
&gt; motivation for your support/not support, especially if you think that<=
br>
&gt; the document should not be adopted as a working group document.<br>
&gt; <br>
&gt; There are no IPR disclosures against this document.<br>
&gt; <br>
&gt; The authors have all stated on the MPLS wg mailing list that they are<=
br>
&gt; unaware of any IPRs that relate to this document.<br>
&gt; <br>
&gt; The working group adoption poll ends October 30, 2018.<br>
&gt; <br>
&gt; /Loa<br>
&gt; mpls wg co-chair<br>
<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@pi.nu" target=3D"_blank"=
>loa@pi.nu</a><br>
Senior MPLS Expert<br>
Bronze Dragon Consulting=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pho=
ne: +46 739 81 21 64<br>
</blockquote></div>

--0000000000002854a60579867ded--

