BGP Confederation and Synchronization

From: OhioHondo (ohiohondo@columbus.rr.com)
Date: Mon Apr 14 2003 - 11:26:28 GMT-3


Hello

I have a question for someone with a grasp on BGP Confederations and how
synchronization affects it. My scenario

AS301/R7 --- AS501/sub-AS65001/R3 --- AS501/sub-AS65002/R1 --- AS101/R9
                        |
                        |
                 AS501/subAS65001/R2

Routers R1, R2 and R3 are in a single OSPF domain. The BGP router-id's and
OSPF router-ids are the same on all routers.

My problem --- an advertisement comes in from AS101/R9, let say 49.0.0.0/8.
That advertisement is propagated via OSPF to router R2 with R1's OSPF
router-id.

When that advertisement crosses the sub-AS border between R1 and R3, the BGP
router-id is changed to that of R3, therefor when the iBGP route gets to R2,
the BGP router-id is from R3 while the OSPF router-id is from R1. The result
is no sync. Any advice????



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