This is the network:

AS101(R1) --- AS102 (R2) --- AS103 (R3)--- (R4)-----AS100(R0)---- to AS101
(R1)

(R3 and R4 are IBGP neighbors)

I have route 172.16.0.0 on AS101 (R1) that is advertised via BGP.
When i do a "show ip bgp", the only routers that have two paths to
172.16.0.0 are R3 and R4. R0 and and R2 only have on path

Given that I have a loop, I would have expected R0 to also have a path to
172.16.0.0 via As103 and R2 to also have a path to 172.16.0.0 via AS103.

Do I have a configuration problem or is this the default behavior of BGP
that it won't accept another path if it already has the information from a
directly connected neighbor? Is this to prevent loops?





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