From: Joe Higgins (netsat@xxxxxxxxxxxxx)
Date: Sun Apr 28 2002 - 10:03:16 GMT-3
This scenario of bgp and ospf over a route reflector setup in absolute terms
cannot work because of the inherent design of ospf and bgp. Previous posts
explain why this is so. I suggest that if one finds oneself in a situation
where they find it impossible to put in the "no synchronization" command then
they should start thinking outside the "BOX" and possible peer the route
reflector clients with each other, or run igrp or eigrp on top of ospf on the
route reflector portion of their network. This horse has been beaten up pretty
badly. Good luck.
Joe H.
Michael Jia wrote:
> Hi,
>
> I have a general question regarding BGP and OSPF sync when router reflector
> is
> used. I've seen some threads discuss it before on the list.
>
> The scenerio is like :
>
> R1 ---- R2------ R3
>
> All R1, R2, R3 are in same AS, R1 and R3 peer to external AS.
> R2 is the route reflecter with iBGP peered to both R1 and R3.
> R1 and R3 doesn't peer with each other.
> OSPF is used as IGP for R1, R2 and R3.
>
> When a eBGP route is redistritued at R1 into OSPF. The route's
> BGP id is R1, its OSPF id is also R1.
> iBGP syncs at R2 without question.
>
> However, it doesn't sync at R3. Because from R3, it sees iBGP id as R2,
> the Reflector's ID, but OSPF id is still R1. (Am I right? please correct me
> if my logic is wrong. At a live lab, if R3 peer with R1 , the route will
> sync
> immediatly. In R3's routing table, it clearly has the route and the next hop
> route as OSPF routes. )
>
> The question is, how to make it sync without using "no sync" at R3?
>
> Thanks a lot.
>
> Michael
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