[isp-bgp] Re: Expert assistance please

[Iljitsch van Beijnum <iljitsch@...>]

On 21-apr-04, at 23:59, Dennis Ott wrote:

> I have 3 connections( 2 T1's, 1 5Mb ) with 3 ISP's.  I would like to 
> route
> all or nearly all of my outbound traffic through the 5Mb connection. 
> But in
> the event the 5Mb connection fails the other 2 T1's will continue to 
> provide
> connectivity.
> I am of the understanding this can be accomplished with a weight, 
> however
> with my lack of experience with BGP I have not had complete success.
The nice thing about the weight is that you can just set it for a peer 
without going through the hassle of using a route map. You don't need 
the AS path filter lists regardless. So:

!
router bgp 20000
 no synchronization
 bgp log-neighbor-changes
 network 64.14.1.64 mask 255.255.255.248
 network 65.11.1.0 mask 255.255.255.0
 network 207.67.226.0
 neighbor 65.112.0.3 remote-as 200
 neighbor 65.112.0.3 weight 5
 neighbor 65.112.0.3 filter-list 10 out
 neighbor 209.189.1.3 remote-as 2900
 neighbor 209.189.1.3 weight 5
 neighbor 209.189.1.3 filter-list 10 out
 neighbor 216.2.0.9 remote-as 1300
 neighbor 216.2.0.9 weight 10
 neighbor 216.2.0.9 ebgp-multihop 5
 neighbor 216.2.0.9 filter-list 10 out
 no auto-summary
!

Since the routes from AS 1300 will now receive the largest weight they 
will be preferred if available. See 
http://www.oreilly.com/catalog/bgp/chapter/ch06.html if you want to do 
more with traffic engineering.







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