The MPLS WG Archive

[anathbandhu garai <anath_bec04@yahoo.co.in>]

Hi,

 

 Can somebody help me to understand Fast Reroute Extensions to RSVP-TE for LSP Tunnels (rfc 4090)?

 

What I understand from the standard that is,

there are two backup methods according to the standard (rfc 4090) for LSP Tunnels -- One-to-One and Facility backup.

 

In case of One-to-One backup method, after the Resv message reaches at PLR from the downstream in the path of the protected LSP, then PLR signals Path message prior to link/node failure through a detour path destined to next-hop node (link-protection) or next-next-hop node (node protection).

 

In case of Facility backup method, after the Resv message reaches at PLR from the downstream in the path of the protected LSP, then PLR selects a bypass path (already exists) destined to next-hop node (link-protection) or next-next-hop node (node protection) and does not signals through that path prior to the link/node failure unless MP uses interface specific label.

 

Now if I am right, then how does PLR select backup path in both the cases?

I think that IGP can help to select the backup path in a single IGP domain.

 

But in case of inter-domain, is node-id subobject in RRO (rfc 4561) enough to do it?

 

Actually I am facing a problem to get the PLR behavior from the Cisco and as well as Juniper router

though I did not try using IGP.

Can anyone give me any suggestion regarding this? It will help me a lot.

 

Thanks in advance.

 

Regards,

Anath Bandhu Garai

 

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