Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed

tony.li@tony.li Mon, 27 April 2020 19:52 UTC

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Date: Mon, 27 Apr 2020 12:52:44 -0700
Cc: Bruno Decraene <bruno.decraene@orange.com>, "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "Acee Lindem (acee)" <acee@cisco.com>, Tony Przygienda <tonysietf@gmail.com>
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References: <MW3PR11MB46191E81D5B22B454D8184A4C1100@MW3PR11MB4619.namprd11.prod.outlook.com> <MW3PR11MB461942C752F9CCB0A6E6C1BFC1100@MW3PR11MB4619.namprd11.prod.outlook.com> <13222_1587383221_5E9D8BB5_13222_339_1_53C29892C857584299CBF5D05346208A48E22AF0@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <MW3PR11MB46191D244D51A05F9AA4631DC1D50@MW3PR11MB4619.namprd11.prod.outlook.com> <CA+wi2hN2A3oZcZWngNjBnZ214jiGNfqyTZpytpK0jrxH68SnqQ@mail.gmail.com> <6448_1587578604_5EA086EC_6448_75_1_53C29892C857584299CBF5D05346208A48E26E6F@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <CA+wi2hPd0Ccn_RiSf=EMa6BfPVhN5FnnOR2hz1PeWpMNNub-BA@mail.gmail.com> <19631_1587662111_5EA1CD1F_19631_99_1_53C29892C857584299CBF5D05346208A48E28EDE@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <CA+wi2hMm=0C9LVy8po2eoYnrTRC6AKawoMJoDoEm5xtbFEvfhw@mail.gmail.com> <4008_1587720323_5EA2B083_4008_332_1_53C29892C857584299CBF5D05346208A48E29FE5@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <CAOj+MMHJfkP5J_Jk+qpLi-VPwca-qwmezynKkKifqcyOxoZAsA@mail.gmail.com> <12067_1587976445_5EA698FD_12067_293_6_53C29892C857584299CBF5D05346208A48E2E14C@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <CAOj+MMH6OZihneJjtH_PfXKfOh1ydTD4hQK3FfDJxjtRowMrRw@mail.gmail.com> <24062_1587989690_5EA6CCBA_24062_69_1_53C29892C857584299CBF5D05346208A48E2E517@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <4DE67B7F-A8E7-4595-8EB6-BED074C38B2F@cisco.com> <27097_1587992566_5EA6D7F6_27097_166_1_53C29892C857584299CBF5D05346208A48E2E687@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <CAOj+MMGENdGn-FB5GwkhsMZsTm_gQSYYmaGCyLy=5nAnCtvSRA@mail.gmail.com> <242BC3A4-0BD5-4F60-9B2F-3C9D1E7106E2@tony.li> <CAOj+MMF+jpfz0vsXum7eH=VTVzGA0dkbyXeQqnNwZ2uoibZ1hQ@mail.gmail.com> <59B46050-6F6B-4A9B-99CD-4E0C76FA17F2@tony.li> <CAOj+MMEWGiwyG6oRdoE5HQdfzNkLK-E3dhBE_FvV=ysqod4Ftw@mail.gmail.com> <C0422461-48A6-4F41-A719-AC43909D78EF@tony.li> <CAOj+MMFfiEtR5g4UP8=gq=QrEjZsvWrnbDo75Oo1f0AXf-38pw@mail.gmail.com> <8D8F32E3-4090-45DA-A771-605365CC5770@tony.li> <CAOj+MMEKh6KE0PrhugOaEr0RkUKq=ihaKC-ngXkszT+zpv1yDg@mail.gmail.com>
To: Robert Raszuk <robert@raszuk.net>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/JwgBvPEZP18oVmo7cd8Myg9QzmU>
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Robert,

> Apologies if I missed it but so far I understood that the new signalling from the receiver could be different per each LSP sender (per each Hello). 


Correct.  We propose to piggyback feedback information in IIH’s, and *SNPs.


> Above I am suggesting that such signalling to be "global" per receiver (ie.sent identical to all LSP senders) under moments of stress/congestion. 


How does that help?

Also, in systems where the area multiple forwarding plane silicon instances, the resources for two different interfaces may have very different control plane resources available.  A single response would not allow the receiver to accurately describe his situation.

Tony