Hi, Robert:
Aijun Wang China Telecom > On Nov 23, 2021, at 20:41, Robert Raszuk <rob...@raszuk.net> wrote: > > > Aijun, > > You are mixing flooding speed with area convergence and with failure > detection. Those are completely orthogonal elements. [WAJ] What I want to express is the overall time from the failures occur to the ABR notice it via only IGP procedures. Shouldn’t it be within millisecond within one area? > > You questioned use of BFD - all I am stating that there is no easy way to > detect failure of the neighbour when LOS trigger is not an option. > > Thx, > R. > >> On Tue, Nov 23, 2021 at 1:26 PM Aijun Wang <wangai...@tsinghua.org.cn> wrote: >> Hi, Robert: >> >> Aijun Wang >> China Telecom >> >>>> On Nov 23, 2021, at 20:00, Robert Raszuk <rob...@raszuk.net> wrote: >>>> >>> >>> Dear Aijun, >>> >>>> [WAJ] Once there is a link/node failure, upon receiving the updated LSA, >>>> the ABR .... >>> >>> That node failure will need to be detected fast. >>> >>> The entire discussion here is to do it reasonably fast or as fast as >>> possible. >> [WAJ] And also as less configuration as possible. We have invested several >> tools to increase the speed of LSA flooding. >>> That is why such detection must happen quickly via LOS or BFD or CFM >>> etc.... That is way before ABR will receive any LSA/LSP from the adjacent >>> nodes informing it of the failed adj. And in fact all such adj nodes MUST >>> do it fast as ABR will not react till it hears bad news from every node >>> previously connected to such PE. >> [WAJ] The reaction time depend on the IGP convergence time after one node is >> detached from the network. It should be in milliseconds within one area? >> Right? >>> >>> In every solution we work on we must see a full picture, not just single >>> pieces of the puzzle. >>> >>> Thx, >>> R. >>> >>> >>> >>> >>> _______________________________________________ >>> Lsr mailing list >>> Lsr@ietf.org >>> https://www.ietf.org/mailman/listinfo/lsr
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