Routing Loop, Failure by Design
I have spent some time studying the CCDE materials. One broken design example that has come up involves route reflector clients that don’t align with the physical topology. This article examines that example and some solutions to the problem.
To illustrate this example we have built the topology below. I used loopback addresses 1.1.1.1 through 6.6.6.6 (based on csr1000v-x). The router on the top is a eBGP neighbor with csr1000v-1 and csr1000v-2. The four routers forming a square in the center have an initial configuration of OSFP and BGP (iBGP as shown). Both Route Reflectors are peered with both clients.
Route Reflector Initial Configuration
//csr1000v-2 shown, csr1000v-3 similar router ospf 1 router-id 2.2.2.2 passive-interface GigabitEthernet2 network 2.2.2.2 0.0.0.0 area 0 network 10.0.0.0 0.255.255.255 area 0 router bgp 64513 bgp router-id 2.2.2.2 bgp log-neighbor-changes neighbor 3.3.3.3 remote-as 64513 neighbor 3.3.3.3 update-source Loopback0 neighbor 4.4.4.4 remote-as 64513 neighbor 4.4.4.4 update-source Loopback0 neighbor 4.4.4.4 route-reflector-client neighbor 5.5.5.5 remote-as 64513 Continue reading
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