MPLS FAST-REROUTE – A PACKET VIEW
Aug 08
Design / Consulting, Juniper No Comments
Hello,
I was going through a deployment scenario which i had deployed earlier and looking at Junipers vs cisco implementation of FRR, i was sort of confused. Juniper are fairly easy to implement, you mention FRR knob at the head-end Router and that is going to be it for your FRR.
The only think which you may need to make sure is all the down stream routers should be capable of understanding this knob.
Lets look at the topology.
Now, Without enabling any Fast-Reroute Knobs, lets see how Path / Resv Message looks like.
Below is the configuration
The path and Resv Messages are exchanged and here is how it looks like – Remember FRR is yet to be enabled
Now, Lets enable FRR and see what changes would occur
Change in the Path-Message sent by R1
Now follows a series of computation
When disabled we can see the utilization of Detour-Label/Path
This is how Juniper is implementing things,
References –
https://tools.ietf.org/html/rfc3209#section-4.1 – RSVP-TE: Extensions to RSVP for LSP Tunnels (object-id 16)
https://tools.ietf.org/html/rfc4090#section-3.1 – Fast Reroute Extensions to RSVP-TE for LSP Tunnels
Regards
Rakesh