RE: bgp 2 isp question

Tech Guy,

> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On
> Behalf Of Tech Guy
> Sent: Tuesday, August 31, 2010 11:58 PM
> To: Paul Negron
> Cc: Fake Name; Tyson Scott; Cisco certification
> Subject: Re: bgp 2 isp question
>
> I have to disagree with both Paul & Tyson.
>
> My real word answer is that AS-prepend will not always do the job for you
> (no matter how many you prepend), when you want to use the second ISP
> connection purely as the backup.
>

I agree, I usually do start off with pre-pending of the AS path. However, some unammed providers will set a local pref of 90 to their peering routes and jack up their customer advertised routes (still want that nth billing). Most of those providers have a publicized communities they will accept that will do the trick though. For example, 701:80 will set the local pref of your advertised routes to Verizon.

http://onesc.net/communities/as701/

-ryan

Blogs and organic groups at http://www.ccie.net
Received on Wed Sep 01 2010 - 13:58:43 ART