Hi All,
Referring to my attached diagram. To check how BGP loop avoidance mechanism work and where its shows basically, What I did, I have advertise one network 10.10.30.0/24 on the router R-2. And Based on eBGP loop prevention the router R-3 should not received the route via router R-1 because the AS path is same and its works also. Even I can See (visible) the same in R-3 after enable the debugging (debug ip bgp update) the output is below.
"
*May 17 05:04:14.939: BGP(0): 192.168.2.1 rcv UPDATE w/ attr: nexthop 192.168.2.1, origin i, originator 0.0.0.0, merged path 100 200, AS_PATH , community , extended community , SSA attribute*May 17 05:04:14.947: BGPSSA ssacount is 0
*May 17 05:04:14.947: BGP(0): 192.168.2.1 rcv UPDATE about 10.10.30.0/24 -- DENIED due to: AS-PATH contains our own AS;
"
Now My question is that referring to the diagram again router R-3 also should not received the same network (10.10.30.0/24) via router R-4 because iBGP don't advertise learned route to other iBGP peer and that is also work.
But I can't see anywhere like I seen in case of eBGP after enabling the debugging. Can any one tell me how to check it could be by debugging like eBGP case or with Wireshark any one. Please help me that how can I see.(I want visibility).
