Re: [nsp] Load balancing with OSPF

From: Patrick W. Gilmore (patrick@priori.net)
Date: Mon Jul 13 1998 - 19:35:11 EDT


At 09:21 AM 7/13/98 +0300, Vicky Fyrigou wrote:
>>
>> EIGRP
>>
>Ok, I know that Eigrp does unequal cost load-balancing,
>but my question was whether I could do the same with
>Ospf?

I don't believe this is possible. I have researched the subject - although
it was about 6 months ago - and the only way I could find to do *automatic*
unequal cost load balancing was EIGRP. You can do the manual thing by
routing specific subnets out each interface and only advertise certain
networks out each interface to control inbound flows, but that's not very
adaptive.

BTW, if you do decide to use load balancing, I *highly* recommend
flow-switching. Otherwise your load balancing can get a bit... uneven. ;)
Even with flow-switching, you'll find it's not perfect. I hear you can do
per-packet load balancing with DCEF and not hit your main proc, but I
haven't tried it. Does anyone know if that will kill the VIP proc? And if
so, what rate will it handle?

>Vicky

TTFN,
patrick

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