Revisit the configuration of the iBGP routers R2#sh run | s r b router bgp 2 bgp log-neighbor-changes neighbor 220.127.116.11 remote-as 2 neighbor 18.104.22.168 update-source Loopback2 neighbor 22.214.171.124 next-hop-self neighbor 126.96.36.199 remote-as 2 neighbor 188.8.131.52 update-source Loopback2 neighbor 184.108.40.206 next-hop-self neighbor 192.168.12.1 remote-as 1 R2# R3#sh run | s r b router bgp 2 bgp … Continue reading Is full meshed iBGP necessary?
The diagram is complicated with an additional link, and instead of full BGP route in AS65000, the BGP route is propagated with the help of OSPF. In previous lab, the BGP full mesh was established by peering both subnets of a BGP router. However this step can be simplified by peering the BGP speaker's loopback … Continue reading BGP: Injecting IGP route into BGP without redistribution
Using the same network diagram, I would want prefix 10.20.0.0 to be filtered from advertisement by the border iBGP routers (r1 and r3). Using prefix-list is a more granular method than using ACL with distribute-list. Hide r2 prefixes from r5 This has to be done at r3 as this is the router than is doing … Continue reading BGP: Route filter with ip prefix-list
r1, r2 and r3 have full meshed BGP peering. No IGP was used. BGP synchronization Before a BGP route is advertised and added to the routing table, this route must be known via an IGP. For the case of AS65000, no IGP is used, only pure iBGP peering hence BGP synchronization will stop bgp speaker … Continue reading BGP: Full mesh BGP without IGP
1841-1 configuration 1841-1#sh run | s router bgp router bgp 64512 no synchronization bgp log-neighbor-changes network 172.16.1.0 mask 255.255.255.0 neighbor 220.127.116.11 remote-as 64513 neighbor 18.104.22.168 ebgp-multihop 2 neighbor 22.214.171.124 update-source Loopback64512 no auto-summary 1841-1#sh run | i ip route ip route 126.96.36.199 255.255.255.255 192.168.1.2 ip route 188.8.131.52 255.255.255.255 192.168.2.2 1841-2 Configuration 1841-2#sh run | s … Continue reading BGP: Load balancing using ebgp multihop and loopback interface.