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

tony.li@tony.li Mon, 27 April 2020 19:20 UTC

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Date: Mon, 27 Apr 2020 12:19:59 -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>
To: Robert Raszuk <robert@raszuk.net>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/9GkZdXmDrdMSjCB2UCmzqTg_DeU>
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Robert,

> For per peer flow control I do not get how receiver's ISIS process is to come up with per peer timer if it may never see under congestion given peer's LSPs (being dropped on the single RE cp queue or at the interface). 


I’m sorry, but I can’t parse this comment.  The intent is not for the receiver to specify a timer value.  The point is for the receiver to provider the LSP sender with feedback about available resources on the receiver. This can inform the sender’s computation of a reasonable transmit bandwidth.


> Perhaps such flag to "slow down guys" could be send by receiver uniformly to all peers when under LSP flooding congestion ?


That’s effectively what we’re proposing, tho it need not be a binary flag.  It allows us to do simpler things saying “we’re running out of buffer space, please slow down a bit”. Again the goal is to find the optimal goodput.  Granularity in the feedback will be helpful.

Tony