So I thought backbone IGP(OSPF) could be configured with fast hellos for the same. At the time of a backbone link failure, even if OSPF converges fast customer is experiencing an outage of 20 seconds between the CPEs(normal ping). I think the longer switchover delay may be due to LDP convergence. Can someone help me with this.
Not sure to understand well your topology. Do you have some mpls enable between the PE and CE? The link failure you are talking about is a failure between the PE and CE?
Is the link between PE and CE directly connected?If yes, did you try BFD for link failure between PE and CE? This would avoid using OSPF for Fast Hello convergence.(You might want to tune OSPF throttle and pacing timers though)
If you talk about backbone failure, BFD could help also if you don't have directly connected links. You might also consider traffic engineering with Fast reroute, TE path protection could also be an option.
Well MPLS VPN Convergence Times Depending on the PE-CE Protocol. We have different protocols having the following convergence time as below:
Static: 25 seconds
OSPF: 35 seconds
BGP: 85 seconds
RIPV2 :85 seconds
You can use static routing in between PE-CE as there is a 60 sec convergence difference between static and BGP routing protocols.
Tuning the BGP
The main delay in route convergence with the BGP protocol is the time taken to advertise a new or deleted VPN route. This time is primarily driven by the advertisement interval timer. This is set by default to 5 seconds for internal BGP (convergence point T4) and 30 seconds for external BGP (convergence points T1 and T7).
you can chose to reduce the internal BGP timer to 1 second and the external BGP timer to 5 seconds. These new timer values allow routes to be distributed across the backbone network more quickly. They also provide a small delay for the advertisement of these routes to external peers to allow a certain amount of packing of routes into the updates.
Using these new timer values, you can able to drop the theoretical maximum convergence time (when BGP-4 is used on the PE-CE links) to 27 seconds. (This is the default theoretical maximum of 85 seconds minus twice a 4-second saving for internal BGP and twice a 25-second saving for external BGP.) This time is more inline with the other routing protocols.
hello state timer:RSVP hellos can be used to detect when a neighboring node is down. The hello state timer then triggers a state timeout. As a result, network convergence time is reduced, and nodes can forward traffic on alternate paths or assist in stateful switchover (SSO) operation.
Or you can use BFD for link failure between PE and CE
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