The MPLS-OPS Archive

[Robert Raszuk <raszuk@cisco.com>]

I am afraid this is implementation specific.

Assume reroute action just too place & the headend of the LSP you are
protecting get's notified about the link failure but with a special flag
indicating not to tear the reservation. We will never return to the
"fixed" link at the local repair point. 

As made sure that headend is notified via realible RSVP signalling we
leave the further action reg this LSP to the headend. It may found
already a new path for it and established it (it could even found the
original path - but not necessarily ;). So we may never return to the
original path or we may depending on the configuration and your
reoptimization interval. But again the decsion for this must be taken by
the headend of the LSP not the repair point.

R.

PS: 

> detours, which usually has higher metric.

Well an alternative would be to keep the detour LSP in the READY state
instead of ACTIVE until either int which this LSP protects goes down
(link protection case) or RSVP hellos detect the remote node failure
(node protection).

> Mihai Dinca wrote:
> 
> Hello all,
> 
> I was searching for more information about Fast
> Reroute feature of MPLS implementation; suppose that
> you have a LSP with fast reroute enabled and in the
> actual path on which traffic flows there is a failure;
> than the traffic is rerouted used the computed
> detours, which usually has higher metric. My question
> is if the traffic is rerouted back on the initial path
> and if yes what is time need it for this (suppose an
> implementation with OSPF as IGP, MPLS and RSVP).
> 
> thanks,
> sinecerely,
> mihai dinca
> 
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