Hi, I think this is a good step forward in at least acknowledging the issue from an overload perspective that can just occur. I think this is likely solved, but I want to see how what are the conclusions on preventing spoofed registrations.
Cheers Magnus From: [email protected] <[email protected]> Date: Friday, 27 January 2023 at 18:02 To: Magnus Westerlund <[email protected]>, [email protected] <[email protected]> Cc: [email protected] <[email protected]>, [email protected] <[email protected]>, [email protected] <[email protected]> Subject: RE: [Last-Call] Tsvart last call review of draft-ietf-lisp-pubsub-10 Re-, Fully agree that dedicating a small fraction of resources (not only links capacity but also CPU) is a good advice, but I don’t think we can use any normative language for this. I tweaked the proposed text as follows: NEW: As a reminder, the initial transmission and retransmission of Map- Notify messages by a Map-Server follow the procedure specified in Section 5.7 of [RFC9301]. Some state changes may trigger an overload that would impact, e.g., the outbound capacity of a Map-Server. A similar problem may be experienced when a large number of state were simultaneously updated. To prevent such phenomena, Map-Servers SHOULD be configured with policies to control the maximum number of subscriptions and also the pace of Map-Notify messages. For example, the Map-Server may be instructed to limit the resources dedicated to handling unsolicited Map-Notify messages to a small fraction (e.g., less than 10%) of its overall processing and forwarding capacity. The exact details to characterize such policies are deployment and implementation specific. Likewise, this document does not specify which notifications take precedence when these policies are enforced. Hope this is better. Cheers, Med De : Magnus Westerlund <[email protected]> Envoyé : vendredi 27 janvier 2023 17:21 À : BOUCADAIR Mohamed INNOV/NET <[email protected]>; [email protected] Cc : [email protected]; [email protected]; [email protected] Objet : Re: [Last-Call] Tsvart last call review of draft-ietf-lisp-pubsub-10 Hi, That is a good start. The general problem for this type of problem is that one can reasonably calculate a pacing schedule based on target bit-rate at the outgoing interface. What one doesn’t know is if what path the various message takes and if that is part of a traffic load causing congestion. The Map-Server will get some indication on potential congestion issue if it has to retransmit many messages as they aren’t acked. I would think the most general thing I would say is to recommend that the pacing target a bit-rate that is no more than a small fraction of the expected bandwidth of the links to the xTRs. That is likely preventing enough issues that there is no point in doing more advanced solution. But that is me assuming that the control plane will mostly run over links with Gbps+ capacity and that one configure this to not burst above like 1-5% of the link capacity one will not have any issues. But if there is more limited capacity or larger deployments maybe the completion time become an issue for each update. Cheers Magnus From: [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>> Date: Friday, 27 January 2023 at 15:53 To: Magnus Westerlund <[email protected]<mailto:[email protected]>>, [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>> Cc: [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>>, [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>>, [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>> Subject: RE: [Last-Call] Tsvart last call review of draft-ietf-lisp-pubsub-10 Re-, Thanks Magnus for clarifying. I suggest to add the following in Section 6: NEW: As a reminder, the initial transmission and retransmission of Map- Notify messages by a Map-Server follow the procedure specified in Section 5.7 of [RFC9301]. Some state changes may trigger an overload that would impact, e.g., the outbound capacity of a Map-Server. A similar problem may be experienced when a large number of state were simultaneously updated. To prevent such phenomena, Map-Servers SHOULD be configured with policies to control the maximum number of subscriptions and also the pace of Map-Notify messages. The exact details to characterize such policies are deployment and implementation specific. Likewise, this document does not specify which notifications take precedence when these policies are enforced. Do we need to say more without going too much into implementation territory? Cheers, Med De : Magnus Westerlund <[email protected]<mailto:[email protected]>> Envoyé : vendredi 27 janvier 2023 11:39 À : BOUCADAIR Mohamed INNOV/NET <[email protected]<mailto:[email protected]>>; [email protected]<mailto:[email protected]> Cc : [email protected]<mailto:[email protected]>; [email protected]<mailto:[email protected]>; [email protected]<mailto:[email protected]> Objet : Re: [Last-Call] Tsvart last call review of draft-ietf-lisp-pubsub-10 Hi Med, Overall, the spec leverages the mechanisms in both RFC9301 and RFC9303. I don't know if you checked those when performing your review. MW: Yes, I looked at those, and as you cite some of it I can explain why I think this isn’t sufficient for this specification. > -----Message d'origine----- > De : last-call > <[email protected]<mailto:[email protected]>> De la part de > Magnus > Westerlund via Datatracker > Envoyé : mardi 24 janvier 2023 14:20 > À : [email protected]<mailto:[email protected]> > Cc : > [email protected]<mailto:[email protected]>; > [email protected]<mailto:[email protected]>; > [email protected]<mailto:[email protected]> > Objet : [Last-Call] Tsvart last call review of draft-ietf-lisp- > pubsub-10 > > Reviewer: Magnus Westerlund > Review result: Not Ready > > This document has been reviewed as part of the transport area > review team's ongoing effort to review key IETF documents. These > comments were written primarily for the transport area directors, > but are copied to the document's authors and WG to allow them to > address any issues raised and also to the IETF discussion list for > information. > > When done at the time of IETF Last Call, the authors should > consider this review as part of the last-call comments they > receive. Please always CC [email protected]<mailto:[email protected]> if you > reply to or > forward this review. > > My review comments are: > > > C. When a Map-Notify is to be sent there are no discussion in > regards to > congestion control of the transmission of the Map-Notify. _________________________________________________________________________________________________________________________ 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. 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