I have never tried to solve this exact issue but you could try using
the priority values to prevent the backup tunnel from preempting
others on that path. I am not sure if these values are honored during
FRR but you could give it a shot.
-Ben
On Nov 16, 2010, at 11:00 AM, Vitaliy Karlov wrote:
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.
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