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Thread Index [isp-bgp] Re: Outbound Balancing
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----- Original Message -----
From: "Iljitsch van Beijnum" <iljitsch@muada.nl>
To: <isp-bgp@isp-bgp.com>
Sent: Saturday, April 24, 2004 4:36 PM
Subject: [isp-bgp] Re: Outbound Balancing
> On 23-apr-04, at 22:35, Serge Paquin wrote:
>
> > What are other options other than prepending inbound AS paths to
> > try to
> > even out bandwidth usage between 2 links? I'm connected to 2 ISP's
> > and my
> > outbound traffic heavily prefered one ISP. I prepended their AS 1
> > time and
> > now my problem has almost reversed. Most of my traffic flows down the
> > other
> > ISP.
>
> > Do I have any other options?
>
> You can set the local preference, as per James' example. The downside
> of that is that it completely overrides looking at the path so it's a
> bit severe. Or you can use the multi exit discriminator metric. But
> this has a pretty much identical effect to prepending, so you need to
> do it selectively, for instance:
>
> !
> router 123
> bgp always-compare-med
> neighbor 1.2.3.4 route-map transit-a-in in
> neighbor 5.6.7.8 route-map transit-b-in in
> !
> ip prefix-list pref-over-a permit 0.0.0.0/2
> ip prefix-list pref-over-a permit 128.0.0.0/2
> !
> route-map transit-a-in permit 10
> match ip address prefix-list pref-over-a
> set metric 10
> !
> route-map transit-a-in permit 20
> set metric 30
> !
> route-map transit-b-in permit 10
> set metric 20
> !
>
> This gives all routes from B a metric of 20 and address space withing
> 0.0.0.0 - 63.255.255.255 and 128.0.0.0 - 191.255.255.255 a metric of 10
> over A and all other address space a metric of 30 over A. The metric
> only gets looked at when the AS path is the same length so basically
> you're only overruling the tie breaker rules.
>
>
>
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