BGP redistribution into OSPF

ncijbailey · ‎12-17-2007

I am building a site with 4 routers connecting sprerate BGP AS areas connected by 2 switches as the core. Where is the best place to do the redistribution? I am currentlly do this at the core but am thinking this might be wrong. If I am suppose to do the redistribution at the router level do I use a metric per remote AS to prioritize? And do I do that at every router or peer all the routers and distribute from one router?

Pavel Bykov · ‎12-18-2007

You should redistribute at the edge. But do you need redistribution, or your network is primarily interconnecting ASs? You can just peer all BGP routers (if there are only 4, you can do full mesh) and not do any redistribtuion but run OSPF on them and disable synchronization.

Prioritization of BGP paths can be done in many ways. You can use local preference for outgoing traffic and AS Prepend for incoming. Or MED, or community, depending on capabilities of the other side.