BGP -> OSPF (Or another way?)

Unanswered Question
Jun 9th, 2009

Hi,

We are receiving a /24 from one of our upstreams, that we need to redistribute into our IGP (OSPF), so that all of our cores are aware that they can reach this /24 primarily through this upstream(Then, if this upstream is down, traffic destined to this /24 would go via our other upstreams)

I know redistributing bgp->ospf is considered a bad idea, but other than adding a static route, is there another option?

Under ospf would it be

redistribute bgp xxx route-map SUBNET_TO_INJECT_FROM_BGP

With the above route maps acl only allowing the /24 we are interested in?

Thanks in advance.

I have this problem too.
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c.captari Tue, 06/09/2009 - 16:00

redistribution from BGP into IGP is considered a bad idea when you have very large BGP tables (internet routing), as the IGP itself is not scaled to handle that.

Otherwise if you are only redistributing limited number of subnets there's no problem in that.

johnelliot6 Tue, 06/09/2009 - 16:32

Thanks.

So the above route-map, with associated acl only allowing single /24 would be 'ok'?

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