Re: BGP load balancing question

Equal cost 0/0 routing would seem to be sufficient for influencing outbound traffic.... I believe accomplished with underlying Cef switching mechanism (src/dst pair hash).... I think u just gotta get the dynamically learned 0/0 route into your igp... Would seem to save resources (bwidth/mem/CPU) too since you only maintain one route from SP.... that's outbound.... Perhaps someone else can tackle inbound.... Been a while since I had my dual oc3s to att and sprint .... Now I just have dual oc48s to single SP (att) less challenging I think with one ISP....can speak to that if you wish

Aaron

On Jan 22, 2011, at 10:30 AM, istong_at_stong.org wrote:

> Hi,
>
> I have a scenario I'm looking at and wondering if anyone is
> aware of any gotchas. I have two different ISP'sconencted
> to two different boarder routers. The inside network
> connects to the two border routers via BGP and learns
> defaults routes from the routers (outbound traffic points to
> the boarder routers via load balanced default routes). I'm
> thinking about ways to get the traffic to load balance on
> the wan links in and out.
>
> One thought is to have full routes sent to the border
> routers and advertise internal routes out both border
> routers to the ISP's. Then connect the border routers via
> iBGP and exchange all routes. Lastly I would implement an
> outbound as-path filter to only permit ^$ (to prevent
> transit traffic).
>
> Any problems with the above scenario. I'm labbing it up but
> hard to test without a lot of routes to simulate the ISP's,
> etc.
>
>
> Thanks
>
>
>
>
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Received on Sat Jan 22 2011 - 13:16:42 ART