[c-nsp] MPLS FRR with auto-bw

[Vitaliy Karlov]

Hello,

Lets say we have a MPLS-enabled triangle:

http://i54.tinypic.com/k2lcw2.jpg

Path AB is being crossed by a couple of MPLS TE Tunnels within automatic bandwidth adjustment (tunnel mpls traffic-eng auto-bw). At the any given point of time summary bandwidth of these tunnels is never exceeded the capacity of the part AB. So bandwidth requests by these tunnels are always satisfied.

Also, assume that there is a tunnel AC with explicit path option. The total bandwidth for this tunnel is unknown and is requested by automatic bandwidth adjustment every 5 min as well.

The question is, is there any way to provide backup facility for path AC via path ABC only if enough bandwidth available at the path AB. For simplicity assume that at the path BC bandwidth is always available.

In case the hardware makes sense, it is 6500 with SXH.

Thanks.