On 11/12/12 9:55 PM, CiscoNSP_list CiscoNSP_list wrote: > Thanks Jay - We already run iBGP(Full mesh under VPNv4) across our POPs > for vrf solutions....how best to migrate our customer routes from > ospf->iBGP? (And how to separate our infrastructure IPs(Keep in OSPF))
Without knowing the details of your network it's going to be tough to go step-by-step. Assuming that you already have loopbacks on your routers in OSPF, BGP points to the loopbacks, and that you have full mesh iBGP or route reflectors in the global table, start with one router and redistribute static and connected into BGP. Use a route map limiting redistribution to customer prefixes or a single customer prefix for testing. The same route map can inject communities as needed (no-export would likely be nice). These would be in the global table unless in a VRF but you're already doing that. Take that prefix out of OSPF and verify that it propagates to your POPs, is reachable throughout your network and doesn't leak outside your AS. Repeat until you have all OSPF customer routes removed from a single router, then on to the next. iBGP is distance 200 and OSPF is 110 so you won't see the BGP route in the forwarding table until you remove the OSPF one. >> Customers with redundant connections can use a private AS into iBGP or >> tracked floating statics redistributed. > > A lot of our customers CE's dont support BGP (Or require a license > upgrade)...so we are stuck(to a degree) with having to support OSPF? For non-redundant customers a static default at the customer edge is all that you need. For redundant customers either upgrade to BGP at the CE or use a floating static for the backup with the inverse at the PE. For backup routes we use a tagged floating static distance >200 on the PE and a route map to match the tag, set weight to 0 and de-pref local pref so that the backup doesn't propagate until the primary goes down. And as Andrew pointed out, if you use a private AS for BGP to the customer prem, then it is actually eBGP. I seem to recall a fairly good presentation writeup on OSPF-BGP migration in the NANOG archives but a quick search comes up empty. -- Jay Hennigan - CCIE #7880 - Network Engineering - [email protected] Impulse Internet Service - http://www.impulse.net/ Your local telephone and internet company - 805 884-6323 - WB6RDV _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
