Subject: fast re-route

From: Sanjay Wadhwa <[email-masked]>
Date: Wed, 25 Apr 2001 19:11:26 -0700 (PDT)

Following question (from my previous posting) is regarding
draft-gan-fast-reroute-00.txt.

> 
> The re-route technique mentioned in this draft talks about using the
> same sender_template for each detour LSP and the primary LSP. It is
> also restricted to use FF style. How would overlapping detours be
> handled here ?
> 
> 
>  R1 ---- R2 ---- R3 ------ R4 ----- R5 ----- R6
>          |       o         |         o
>          |       o         |         o
>          +------ R7 -o-o-o R8 oooooooo
> 
> Lets say R2 and R3 are local repairers.          
> R2-R7-R8-R4 (dashed path) provides detour for node R3.
> R3-R7-R8-R5 (bubbled path) provides a detour for R4.
> Both detours have R7-R8 as a common link. In this case you would want
> R8 to send different labels corresponding to the two detours to R7,
> since R8 needs to switch packets coming on the two detours out
> different interfaces (R8-R4 and R8-R5). If the sender_template is
> identical for the two detours how would R8 send two different labels
> to R7 (labels go with the filter-spec in RESVs. And I don't see the
> detour object being passed back in the RESV to possibly identify the
> detour)?
> 
> -Sanjay
> 
> 
> 

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