From: Jack Heney (jheneyccie@xxxxxxxxxxx)
Date: Sat Oct 28 2000 - 10:47:29 GMT-3
Intersting behavior...wondering if anyone can explain?
RtrA---------RtrB-----------RtrC------------RtrD
BGP2 BGP1 BGP1 10.1.1.0 BGP1
A has neighbor relationship with B only; B,C,D have full-mesh of neighbor
relationships
B,C,D are running OSPF (area 0)
C has a "network 10.1.1.0 mask 255.255.255.0" statement under BGP1
Now, here's the strange part....I left synchronization on on RtrB to see if
I could get it to advertise 10.1.1.0 to A via BGP. I figured that B would
learn about 10.1.1.0 through OSPF and BGP, so leaving synchronization on
shouldn't be a problemm. At first, B wouldn't advertise 10.1.1.0 to A. I
did a little investigating and found that D was the designated router on the
10.1.1.0 network. For some reason, I decided to try changing the DR to C.
After making this change, B started advertising 10.1.1.0 to A. I couldn't
believe that this was the actual source of my problem, so I changed the DR
back to D, and B stopped advertisiing the network to A again. I have since
replicated this experiment and the behavior continues to be the same. I am
using 12.07t....Can anyone explain why changing which router on the data
link is the designated router would affect BGP synchronization with OSPF?
I'm stumped.
Thanks,
Jack
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