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

[Ton S <ton-s-lijst@...>]

James,

There is a reason that  made protocol developers create defaults for 
almost everything they developed.
Main reason is theirs (and ultimately yours) nightrest.   You like it 
when your pager goes off at 03:00 AM ?

For OSPF it would be easy to tweak the default timers, since it is an 
IGP, and corporate guidelines can prescribe aberations from the 
standard. Nontheless, you can set a standard for your company on timers 
that  they should adhere to, but what if the shareholders decide to  
'aquire' or 'divest' a part of your AS ?

For BGP, which is mostly used as an EGP, it would be different.  You 
will have to make deals (and keep track of those agreements in case you 
get 'outsourced') with your BGP peers if you want to change default 
timers.  Aww, shoot, it can be in the same database as where you keep 
your MD5 encryption strings for that BGP session.

In short....If you like being busy, tweak the timers.  If you have 
enough other things to do, leave them to default.

Ton




James Worley wrote:
> Hi there,
>
> This is my first post to the group. We have been around for a while but
> had always ran PI space though a 3rd party. As the business has grown we
> have been assigned our own AS and /19 from RIPE.
>
> I have worked on SME customer networks for a while so feel quite
> comfortable with our IGP - OSPF. It is the EGP than has me diving for the
> manual...
>
> 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...
>
> IGP has the following timers.
> !
>  ip ospf hello-interval 3
>  ip ospf dead-interval 15
>
> We also plan for connecting some customers with HSRP. The customers 'LAN'
> allocation will be Conditionally advertised on existence of their 'WAN'/30
> prefix. Both of these prefixes will be carried via iBGP. Are there any
> issues with the outbound (customers perspective) timers of HSRP and the
> inbound timers of iBGP?
>
> 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!
>
> Kindest Regards
> James



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