Re: [Lsr] Dynamic flow control for flooding
Henk Smit <henk.ietf@xs4all.nl> Wed, 24 July 2019 15:40 UTC
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Date: Wed, 24 Jul 2019 17:40:36 +0200
From: Henk Smit <henk.ietf@xs4all.nl>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
Cc: Tony Li <tony.li@tony.li>, lsr@ietf.org
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Subject: Re: [Lsr] Dynamic flow control for flooding
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Les Ginsberg (ginsberg) schreef op 2019-07-23 22:29: > It is a mistake to equate LSP flooding with a set of independent P2P > “connections” – each of which can operate at a rate independent > of the other. Of course, if some routers are slow, convergence in parts of the network might be slow. But as Stephane has already suggested, it is up to the operators to determine if slower convergence in parts of their network is acceptable. E.g. they can chose to put fast/expensive/new routers in the center of their network, and move older routers to, or buy cheaper routers for, the edges of their network. But I have a question for you, Les: During your talk, or maybe in older emails, I was under the impression that you wanted to warn for another problem. Namely microloops. I am not sure I understand correctly. So let me try to explain what I understood. And please correct me if I am wrong. Between the time a link breaks, and the first router(s) start to repair the network, some traffic is dropped. Bad for that traffic of course. But the network keeps functioning. Once all routers have re-converged and adjusted their FIBs, everything is fine again. In the time in between, between the first router adjusting its FIB and the last router adjusting its FIB, you can have microloops. Microloops multiply traffic. Which can cause the whole network to suffer of congestion. Impacting traffic that did not (originally) go over the broken link. So you want the transition from "wrong FIBs", that point over the broken path, to "the final FIBs", where all traffic flows correctly, to have that transition happen on all routers at once. That would make the network go from "drop some traffic" to "forward over the new path" without a stage of "some microloops" in between. Am I correct ? Is this what you try to prevent ? Is this why you want all flooding between routers go at the same speed ? Thanks in advance, henk.
- [Lsr] Dynamic flow control for flooding Tony Li
- Re: [Lsr] Dynamic flow control for flooding Les Ginsberg (ginsberg)
- Re: [Lsr] Dynamic flow control for flooding Tony Przygienda
- Re: [Lsr] Dynamic flow control for flooding David Lamparter
- Re: [Lsr] Dynamic flow control for flooding Les Ginsberg (ginsberg)
- Re: [Lsr] Dynamic flow control for flooding Tony Przygienda
- Re: [Lsr] Dynamic flow control for flooding Robert Raszuk
- Re: [Lsr] Dynamic flow control for flooding Les Ginsberg (ginsberg)
- Re: [Lsr] Dynamic flow control for flooding stephane.litkowski
- Re: [Lsr] Dynamic flow control for flooding tony.li
- Re: [Lsr] Dynamic flow control for flooding Les Ginsberg (ginsberg)
- Re: [Lsr] Dynamic flow control for flooding tony.li
- Re: [Lsr] Dynamic flow control for flooding tony.li
- Re: [Lsr] Dynamic flow control for flooding Robert Raszuk
- Re: [Lsr] Dynamic flow control for flooding henk.ietf
- Re: [Lsr] Dynamic flow control for flooding Henk Smit
- Re: [Lsr] Dynamic flow control for flooding Robert Raszuk
- Re: [Lsr] Dynamic flow control for flooding Henk Smit
- Re: [Lsr] Dynamic flow control for flooding Robert Raszuk
- Re: [Lsr] Dynamic flow control for flooding Tony Przygienda
- Re: [Lsr] Dynamic flow control for flooding Henk Smit
- Re: [Lsr] Dynamic flow control for flooding tony.li
- Re: [Lsr] Dynamic flow control for flooding tony.li
- Re: [Lsr] Dynamic flow control for flooding Les Ginsberg (ginsberg)
- Re: [Lsr] Dynamic flow control for flooding Robert Raszuk
- Re: [Lsr] Dynamic flow control for flooding Les Ginsberg (ginsberg)
- Re: [Lsr] Dynamic flow control for flooding Les Ginsberg (ginsberg)
- Re: [Lsr] Dynamic flow control for flooding tony.li
- Re: [Lsr] Dynamic flow control for flooding Les Ginsberg (ginsberg)
- Re: [Lsr] Dynamic flow control for flooding stephane.litkowski
- Re: [Lsr] Dynamic flow control for flooding Les Ginsberg (ginsberg)
- Re: [Lsr] Dynamic flow control for flooding tony.li
- Re: [Lsr] Dynamic flow control for flooding Les Ginsberg (ginsberg)
- Re: [Lsr] Dynamic flow control for flooding tony.li
- Re: [Lsr] Dynamic flow control for flooding tony.li
- Re: [Lsr] Dynamic flow control for flooding tony.li
- Re: [Lsr] Dynamic flow control for flooding Les Ginsberg (ginsberg)
- Re: [Lsr] Dynamic flow control for flooding tony.li
- Re: [Lsr] Dynamic flow control for flooding Henk Smit