Re: [isp-bgp] Tuning BGP timers - Best Practice

[Pete Templin <petelists@...>]

James Worley wrote:

> I have been playing with the various options within BGP and am not sure if
> i should change the cisco default timers? I have read a few documents that
> recommend 1sec advertisement-interval for internal peers and 5sec for
> external... others advice changing the hold down timer...
>
> I would be grateful for any advice or know best practices anybody could
> give me. All input is welcome and apologies if I am being a noob!
Don't know if it's best practice, but our practice is:

Upstream:  Use defaults on TDM media (where end-to-end bidirectional 
status is detectable).  Use short timers (perhaps as aggressive as 5/15) 
on Ethernet media where end-to-end bidirectional status isn't easily 
detectable aside from keepalives.

Downstream: Reuse system defaults (Cisco, 60/180), but enforce a minimum 
of 10/30 so the customer can't tighten down to lower than that without 
requesting the specific value (and justifying WHY they need that).

pt





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