Aijun Wang <wangai...@tsinghua.org.cn> writes:
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.
You keep mentioning less configuration or less configuration complexity when people mention BFD. This isn't any sort of justification for not using BFD. Operators use central management systems now a days, that generate a routers configuration, they aren't hand typing configuration into routers anymore. There's no problem at all with enabling BFD through configuration, and it's use is absolutely not predicated based on how one has to configure it. Saying BFD is hard to configure is not valid to me. If you are advocating for something that would replace BFD, I hope you have a stronger argument against using BFD. Thanks, Chris. [WG member hat - for previous emails on this thread too -- forgot to include]
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.
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