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

["Wyatt Sullivan" <wsullivan@macomp.com>]

In OSPF we use 1sec dead internally unless we have a specific issue.  We
have an 6 second dead through our bridged firewall, as if it fails over
there's a 3 second delay and a 2 second  l2 port failover.  I much prefer
lowering the default values as most of our end users will complain about 15
seconds of down time, but they're clueless about 1 second of downtime.

Agreed with everyone else about BGP.  Default timers are TOO slow for
today's requirements.

Wyatt Sullivan

> -----Original Message-----
> From: James Worley [mailto:james@tridentnet.net] 
> Sent: Thursday, November 23, 2006 10:14 AM
> To: isp-bgp@isp-bgp.com
> Subject: [isp-bgp] Tuning BGP timers - Best Practice
> 
> 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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