OSPF: SPF Throttling only on bounching interface ?

AndiS

If the one of the OSPF link is bounching frequently, how to configure OSPF SPF Throttling only on specific interface ?

    OSPF > ispf

                  timer throttle <delay> <min-wait> <max-wait>                   //apply to all links.

 

How to make this only apply to bounching link ? Is that possible ?

 

 

markus.wirth

Hi!

I will have a look if this is possible, never seen that before. Wouldnt it make sense to fix the bouncing issue?

 

Regards!

Markus

markus.wirth

Well I dont think that this will work (if someone knows, correct me!!). As throttling is connected to the SPF algorithm and the SPF algorithm gets its infos by the routers interfaces and neighbors, the timer settings will only change the behavoiur of the SPF algorithm routine itself (globally). Does not make sense in my eyes as the calculation of SPF is not per interface but per topology.

 

Regards!

Markus

qqabdal

As far as I know that is not possible either, this is a process-wide config.

northlandboy

Interface dampening will probably do what you want

On 28/02/2012, at 12:37 PM, qqabdal <[email protected]> wrote:

As far as I know that is not possible either, this is a process-wide config.

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eborgard

Yeah.  I was thinking of IP Event Dampening in this scenario.

http://www.cisco.com/en/US/docs/ios/12_2t/12_2t13/feature/guide/ftipevdp.html

dcancerian

Well I dont think that this will work (if someone knows, correct me!!). As throttling is connected to the SPF algorithm and the SPF algorithm gets its infos by the routers interfaces and neighbors, the timer settings will only change the behavoiur of the SPF algorithm routine itself (globally). Does not make sense in my eyes as the calculation of SPF is not per interface but per topology.

Thats correct, ip event dampening can be a solution for penlazing bouncing links instead of changing the spf calulations.

markus.wirth

So I guess event dampening prevents information over ip changes etc from entering the spf calculation/rib by defining thresholds.

Right?

Regards!

Narayan.Neupane

OSPF > ispf

                  timer throttle <delay> <min-wait> <max-wait>                   //apply to all links.

 

How to make this only apply to bounching link ? Is that possible ?

If you would like to use timer throttle command, it applies to all OSPF enabled interfaces

see here:

http://www.cisco.com/en/US/docs/ios/12_2s/feature/guide/fs_spftrl.html

So applying on per-interface basis is not possible.

Narayan.Neupane

I was thinking of IP Event Dampening in this scenario.

http://www.cisco.com/en/US/docs/ios/12_2t/12_2t13/feature/guide/ftipevdp.html

I agree on IP Event Dampening in this scenario.