Aijun Wang <wangai...@tsinghua.org.cn> writes:

Hi, Chris:

For BFD configuration, I think central control has less help for the work. Let’s
consider the SRv6 tunnel, would you configure on every intermediate node to
detect the liveness of destination via BFD?

I was replying to you saying you wanted to use IGP neighbor down detection b/c 
BFD was too hard to configure. I'm not sure what use case you are talking about 
above.

Configuring things is not hard, and isn't a reason to invent new technology by 
itself, is what I'm saying. Operators of large networks generally have central 
management systems where they enable services and the mgmt system then 
automatically generates configuration files as complex as they need to be which 
the system then loads onto the devices.

Thanks,
Chris.
[wg member hat]



Aijun Wang
China Telecom

On Nov 23, 2021, at 20:44, Christian Hopps <cho...@chopps.org> wrote:


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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