[c-nsp] OSPF per-prefix LFA

[Mohammad Khalil]

Hi 
OSPF tuning for which parameters exactly ?
I have adjusted hello/dead intervals

Thanks

BR,
Mohammad

From: ggiannou at gmail.com
Date: Thu, 28 May 2015 15:04:34 +0300
Subject: Re: [c-nsp] OSPF per-prefix LFA
To: nick at foobar.org
CC: eng_mssk at hotmail.com; cisco-nsp at puck.nether.net

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



_______________________________________________

cisco-nsp mailing list  cisco-nsp at puck.nether.net

https://puck.nether.net/mailman/listinfo/cisco-nsp

archive at http://puck.nether.net/pipermail/cisco-nsp/