[c-nsp] OSPF per-prefix LFA

[George Giannousopoulos]

Hi,

In a similar case TAC advised that we should also enable OSPF tuning.
Actually OSPF tuning is considered a prerequisite in order to take full
advantage of the LFA feature..

Have you tried that?

--
George

On Thu, May 28, 2015 at 2:53 PM, Nick Hilliard <nick at foobar.org> wrote:

> 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: nick at foobar.org
> >> To: eng_mssk at hotmail.com; cisco-nsp at puck.nether.net
> >> 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
>
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