Re: [auth48] AUTH48: RFC-to-be 9494 <draft-ietf-idr-long-lived-gr-06> for your review

[Megan Ferguson <[e-mail]>]

Hi John and Bruno,

Thank you for your replies and guidance.  We have updated according to John’s messages.

Please review the files carefully as we do not make changes after publication.  

The files have been posted here (please refresh):
   https://www.rfc-editor.org/authors/rfc9494.txt
   https://www.rfc-editor.org/authors/rfc9494.pdf
   https://www.rfc-editor.org/authors/rfc9494.html
   https://www.rfc-editor.org/authors/rfc9494.xml
 
The relevant diff files have been posted here (please refresh):
   https://www.rfc-editor.org/authors/rfc9494-diff.html (comprehensive diff)
   https://www.rfc-editor.org/authors/rfc9494-auth48diff.html (AUTH48 changes only)
   https://www.rfc-editor.org/authors/rfc9494-lastdiff.html (last to current version only)

Please contact us with any further updates/questions/comments you may have.  

We will await approvals from each of the parties listed on the AUTH48 status page prior to moving forward to publication.  

The AUTH48 status page for this document is available here:

https://www.rfc-editor.org/auth48/rfc9494

Thank you.

RFC Editor/mf

> On Nov 3, 2023, at 10:26 AM, [e-mail] wrote:
> 
> Hi John, Megan, all
> 
> 
> Orange Restricted
> 
>> -----Original Message-----
>> From: John Scudder <[e-mail]>
>> Sent: Wednesday, October 25, 2023 2:20 AM
>> To: DECRAENE Bruno INNOV/NET <[e-mail]>
>> Cc: [e-mail]; [e-mail]; [e-mail]; Jeff Haas <[e-mail]>; [e-mail]; [e-mail]; [e-mail]; [e-mail]
>> Subject: Re: AUTH48: RFC-to-be 9494 <draft-ietf-idr-long-lived-gr-06> for your review
>> 
>> Hi Bruno and all,
>> 
>> My comments are in line. I agree with most of Bruno’s suggestions, but not all.
> 
> John, thanks for your review. I agree with all your points.
> 
> Thanks,
> --Bruno
> 
>> Following this email I’ll send my edited version of the XML (that doesn’t include anything with respect to this reply).
>> 
>>> On Oct 3, 2023, at 12:06 PM, [e-mail] wrote:
>>> 
>>> Hi RFC Editor, _John_
>>> 
>>> Thanks for the updated draft.
>>> 
>>> I've read the diff and don't have comments.
>>> I have read the whole document and don't have firm request for change.
>>> 
>>> 
>>> I may have some weak suggestions below, so only to be retained if
>>> someone else support them.(e.g., John 😉 )
>>> 
>>> John, I apologize for some late comments.
>>> 
>>> ----
>>> §5.2
>>> Although this document has a single Figure, I generally find useful
>>> for Figures to have a reference. So my suggestion would be to add a
>>> reference (e.g., Figure 1)
>> 
>> OK by me.
>> 
>>> 
>>> -----
>>> §3.1 says  "This [LLGR] capability MUST be advertised in conjunction with the Graceful Restart capability ;"
>>> §4.1 says "The Graceful Restart capability MUST be advertised in
>>> conjunction with the LLGR capability." (i.e., the other way around)
>>> 
>>> I'm not sure whether "conjunction" is "bijective" or not.
>>> - If not, both sentences would not mean the same thing.
>>> - if yes, I don't think that this is exactly what we mean.
>>> 
>>> What we mean, in very simple terms, is: If the LLGR capability is sent, then the GR capability MUST be sent.
>>> But we don't want to imply the other way around. (Since this RFC does
>>> not update RFC4724, I don't think that someone could understand it
>>> wrongly)
>>> 
>>> I'll leave anyone else to suggest text. (or just drop the comment as
>>> being paranoiac)
>> 
>> I think you’re right.
>> 
>>> 
>>> ---
>>> §4.1
>>> 
>>> OLD: We observe that, if support for conventional Graceful Restart is not
>>>  desired for the session, the conventional GR phase can be skipped by
>>>  omitting all AFIs/SAFIs from the GR capability, advertising a Restart
>>>  Time of zero, or both.
>>> 
>>> NEW:
>>> We observe that, if support for conventional Graceful Restart is not
>>>  desired for the session, the conventional GR phase can be skipped by
>>>  omitting all AFIs/SAFIs from the GR capability, _or_ advertising a Restart
>>>  Time of zero, or both.
>>> 
>>> (adding "or" before " advertising a Restart Time of zero") Totally up
>>> to you. An explicit "or" would typically be required in French to distinguish from an implicit "and". May be "or" is implicit in English.
>> 
>> Doesn’t seem necessary but I leave it to the pros to decide.
>> 
>>> 
>>> ---
>>> 
>>> 
>>> §4.2
>>> 
>>> " Similar to [RFC4724], once the session is re-established, if the F
>>>  bit for a specific address family is not set in the newly received
>>>  LLGR Capability, or if a specific address family is not included in
>>>  the newly received LLGR Capability or if the LLGR and accompanying GR
>>>  Capability are not received in the re-established session at all,
>>>  then the Helper MUST immediately remove all the stale routes from the
>>>  peer that it is retaining for that address family."
>>> 
>>> My reading is that the above sentence could be read as changing RFC4724 by saying that if a specific address family is not included in the newly received LLGR Capability then the Helper MUST immediately remove all the [GR] stale routes, including during the GR "Restart Time".
>>> 
>>> I would suggest the minimal change below
>>> OLD: once the session is re-established
>>> NEW: once the session is re-established after the duration of the "Restart Time"
>> 
>> Agreed on the principle. For example, the new GR cap might advertise a given AFI/SAFI with nonzero restart time, and the LLGR cap might not advertise that AFi/SAFI at all… which elsewhere we say is an implicit LLGR time. So yeah, in that case it should only be policed once the LLGR phase is initiated.
>> 
>> A little concerned that the proposed wording might not be clear, but let’s see it in context and we can re-review.
>> 
>>> 
>>> ------
>>> §4.2
>>> 
>>> "  While the session is down, the expiration of a "Long-lived Stale
>>>  Time" timer is treated analogously to the expiration of the "Restart
>>>  Time" timer in Graceful Restart"
>>> 
>>> I would suggest
>>> OLD: the expiration of the "Restart Time" timer in Graceful Restart
>>> NEW: the expiration of the "Restart Time" timer in [RFC 4724]
>> 
>> WFM.
>> 
>>> 
>>> Because "the expiration of the "Restart Time" timer in Graceful Restart" could be read as the new behavior defined in this section, with text starting with " Once the "Restart Time" period ends (including the case in which the "Restart Time" is zero), the LLGR period is said to have begun and  the following procedures MUST be performed"
>>> 
>>> ----
>>> §4.3
>>> 
>>> " A BGP speaker that has advertised the "Long-lived Graceful Restart
>>>  Capability" to a neighbor MUST perform the following upon receiving a
>>>  route from that neighbor with the "LLGR_STALE" community"
>>> 
>>> Possibly
>>> OLD: advertised the "Long-lived Graceful Restart Capability" to a
>>> neighbor
>>> NEW: exchanged the "Long-lived Graceful Restart Capability" with a
>>> neighbor
>>> 
>>> Reason: if the LLGR capability is not received from the neighbor, possibly than neighbor does not support LLGR and hence was not the one setting the "LLGR_STALE" community. This seems to open the possibility of a (possibly distant) attacker to influence routing on the receiver.
>> 
>> I don’t think we should make this change, I think it would be a change to the design. If I remember right, it’s intentional that it should work as you state. It’s been a while, so maybe I’m wrong… but in Section 4.6 we have,
>> 
>> Ideally, all routers in an Autonomous System (AS) would support this
>> specification before it were enabled.  However, to facilitate
>> incremental deployment, stale routes MAY be advertised to neighbors
>> that have not advertised the Long-lived Graceful Restart Capability
>> under the following conditions:
>> 
>>> 
>>> ---
>>> §4.6
>>> 
>>> "If this strategy for partial deployment is used, the network operator
>>>  should set the LOCAL_PREF to zero for all long-lived stale routes
>>>  throughout the Autonomous System.  This trades off a small reduction
>>>  in flexibility (ordering may not be preserved between competing long-
>>>  lived stale routes) for consistency between routers that do, and do
>>>  not, support this specification.  Since the consistency of route
>>>  selection can be important for preventing forwarding loops, the
>>>  latter consideration dominates."
>>> 
>>> John, the above text seems to indicate that the whole AS should use LOCAL_PREF zero rather than honoring "LLGR_STALE" community. This seems to call for §4.6 to also ask to remove the "LLGR_STALE" community. (otherwise a downstream BGP speaker compliant with LLGR would react on this community.
>> 
>> This argument and the previous one may well be meritorious. But, a change like you suggest would be normative and significant, requiring both another trip through the WG and (more concerning to me) a respin of implementations that have been in the field for quite a long time now. If you think it’s very important, of course, “better late than never” applies to fixing serious protocol errors. But my first reaction is that this isn’t a serious error, just a design choice that we might have wanted to reconsider had we discussed it earlier, and we should leave the design as it stands.
>> 
>>> 
>>> ---
>>> §5.2
>>> Minor comment as this is part of an example.
>>> OLD: Routers A and D are AS border routers, each advertising some
>>> route, R, into the AS
>>> NEW: Routers A and D are AS border routers, each advertising some
>>> route, R, with same preference, into the AS
>> 
>> Fine by me, although s/with same preference/with the same preference/ and then we also have to ask if we should use “preference” which is ambiguous, or LOCAL_PREF which is more ponderous but also more precise.
>> 
>>> 
>>> ---
>>> §5.2
>>> " Since different routers within an AS might have different notions as
>>>  to whether their respective sessions with a given peer are up or
>>>  down, they might apply different selection criteria to routes from
>>>  that peer."
>>> 
>>> Agreed.
>>> Another case if when a BGP receiver change the timers received in the
>>> LLGR capability (and we called for them to be modifiable). Do we want
>>> to also raise that case? (I'm not asking for. Raising the point just
>>> in case )
>> 
>> It’s a good point but I think we can let it go — it’s not an error in the spec, just something we could have added if we had thought of it in time.
>> 
>> —John
>> 
>>> 
>>> Thanks,
>>> Regards,
>>> --Bruno
>>> 
>>> 
>>> Orange Restricted
>>> 
>>> -----Original Message-----
>>> From: [e-mail] <[e-mail]>
>>> Sent: Monday, October 2, 2023 9:40 PM
>>> To: [e-mail]; [e-mail]; DECRAENE Bruno
>>> INNOV/NET <[e-mail]>; [e-mail]
>>> Cc: [e-mail]; [e-mail]; [e-mail];
>>> [e-mail]; [e-mail];
>>> [e-mail]
>>> Subject: AUTH48: RFC-to-be 9494 <draft-ietf-idr-long-lived-gr-06> for
>>> your review
>>> 
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>>> M%3D&reserved=0
>>> 
>>> 
>>> Tracking progress
>>> -----------------
>>> 
>>> The details of the AUTH48 status of your document are here:
>>> 
>>> https://urld/
>>> efense.com%2Fv3%2F__https%3A%2F%2Fwww.rfc-editor.org%2Fauth48%2Frfc949
>>> 4__%3B!!NEt6yMaO-gk!HOtjEsdhsHdRC4bu4E97keM0CgAviUnuB2bt04VMbik8Im9-R-
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>>> ved=0
>>> 
>>> Please let us know if you have any questions.
>>> 
>>> Thank you for your cooperation,
>>> 
>>> RFC Editor
>>> 
>>> --------------------------------------
>>> RFC9494 (draft-ietf-idr-long-lived-gr-06)
>>> 
>>> Title            : Support for Long-lived BGP Graceful Restart
>>> Author(s)        : J. Uttaro, E. Chen, B. Decraene, J. Scudder
>>> WG Chair(s)      : Susan Hares, Keyur Patel, Jeffrey Haas
>>> 
>>> Area Director(s) : Alvaro Retana, John Scudder, Andrew Alston
>>> 
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>> 
> ____________________________________________________________________________________________________________
> Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc
> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler
> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration,
> Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci.
> 
> This message and its attachments may contain confidential or privileged information that may be protected by law;
> they should not be distributed, used or copied without authorisation.
> If you have received this email in error, please notify the sender and delete this message and its attachments.
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