Hi, Robert:

Aijun Wang
China Telecom

> On Nov 23, 2021, at 20:00, Robert Raszuk <[email protected]> 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.
> 
> 
> 
>  
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