That is what made me ask :) Because I have changed the vlaues to 1/4 (without BFD) as configuring BFD on GNS3 will crash my routers as you know The same expected failover was 4-5 seconds even after adjusting hello/dead timers !
> Date: Thu, 28 May 2015 13:01:17 +0100 > From: [email protected] > To: [email protected]; [email protected] > Subject: Re: [c-nsp] OSPF per-prefix LFA > > changing the hello-time should affect failover time in your test > environment. Did you test this? e.g. compare 1s/4s vs 10s/40s. > > Nick > > On 28/05/2015 12:58, Mohammad Khalil wrote: > > Ok , Sorry I misunderstood > > So , I think combining both BFD and LFA will do the required failover time > > But why changing the hello-time on both interfaces (the link between R1 and > > R2) will not affect ? > > > > BR, > > Mohammad > > > >> Date: Thu, 28 May 2015 12:53:35 +0100 > >> From: [email protected] > >> To: [email protected]; [email protected] > >> Subject: Re: [c-nsp] OSPF per-prefix LFA > >> > >> This has nothing to do with OSPF virtual links. I'm talking about the > >> virtual ethernet interfaces defined in your virtual lab. > >> > >> You can test out whether it's doing what I suggested by changing the > >> hellotime value on the relevant interfaces. > >> > >> Nick > >> > >> On 28/05/2015 12:50, Mohammad Khalil wrote: > >> > Hi Nick and thanks for the reply > >> > All my routers are participating in area 0 , no virtual-link in place > >> > I shutdown the interface connected to R2 (from CSR or R1 side) > >> > > >> > BR, > >> > Mohammad > >> > > >> >> Date: Thu, 28 May 2015 12:36:50 +0100 > >> >> From: [email protected] > >> >> To: [email protected]; [email protected] > >> >> Subject: Re: [c-nsp] OSPF per-prefix LFA > >> >> > >> >> On 28/05/2015 12:24, Mohammad Khalil wrote: > >> >> > When I shutdown the interface with R2 (as I do not want to turn off > >> >> > the > >> >> > remote interface on R2 as I cannot turn on BFD on GNS3) and I have > >> >> > checked the route to 2.2.2.2 , it took about 5-6 seconds to install > >> >> > the > >> >> > same route via the backup path (via R3) > >> >> > >> >> did you try this by shutting down both sides of the virtual link at the > >> >> same time? The remote side will not detect carrier loss on a virtual > >> >> link, > >> >> so ospf failover will be detected by according to the ospf deadtime. > >> >> > >> >> If you handle this with bfd, the failover time should be much faster. > >> >> Last > >> >> time I measured this (me3600/100ms bfd), the failover time for l2vpn lsp > >> >> rerouting was reliably less than 400ms. I.e. the failover for regular ip > >> >> service should be a little less. > >> >> > >> >> Nick > >> > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
