The MPLS WG Archive

[Ping Pan <pingpan@juniper.net>]

Doug Degan wrote:

> hi.
> 
> I have another question regarding pan's draft in BYPASS method:
> 
> 1) how does upstream routers act upon receiving of PATH TEAR message? 
> there should be different activity between normal router and MP - but 
> how does a router know he is active MP for a given LSP?
> 
> if he does - he shouldn't tear it, but if he is just transit router - he 
> should tear it!
>


When there is a network problem, the protected LSPs will use the bypass 
LSP, and initiate Path Messages that will merge at MP. At this point, 
it's a bunch of RSVP sessions using SE. When you get a PathTear, just 
act according to what RSVP had defined.... kill the session and 
associated branches.

- Ping


>  
> 
> thanks in advance.
> 
> doug.
> 
>  
>