The MPLS WG Archive

[Arthi Ayyangar <ayyangar@apollo.mctr.umbc.edu>]

Hi,

> 
> I have a question on the RRO handling in <draft-gan-fast-reroute>.
>  
>        Node1 ====> Node2 ======> Node3 =====> Node4 ======> Egress
>                       v                       ^ 
>                       |                       | 
>                       +-----------------------+ 
> 
> Notation: @(3-2) == IP address of node 3 on the link [node 3 - node 2].
> 
> Assume that the link between node 2 and node 3 fails. Then the detour
> [node 2 - node 4] is taking over. But what does node 2 then send in the
> RRO object of the RESV message to node 1: Does node 2 continue to send
> [@(2-1), @(3-2), @(4-3), @(egress-4)] or does node 2 send [@(2-1),
> @(detour between 4-2), @(egress-4)] or ...? 
> 
---> It would send , [@(2-1), @(detour between 4-2), @(egress-4)] 
as the RRO in the Resv once the detour has taken over.

-arthi