Configuring BGP Routes Reflector Lab

Topology

Configuring BGP Routes Reflector Lab

Lab Purpose: Master BGP route reflector configuration.

Lab Steps:

1、Finish basic IP configuration.

2、Enable BGP on all routers.

R3(config)#router bgp 100

R3(config-router)#neighbor 192.168.1.5 remote-as 100

R3(config-router)#neighbor 172.24.1.18 remote-as 100

R3(config-router)#network 200.100.50.0 mask 255.255.255.0

R1(config)#router bgp 100

R1(config-router)#neighbor 192.168.1.6 remote-as 100

R2(config)#router bgp 100

R2(config-router)#neighbor 172.24.1.17 remote-as 100

R2(config-router)#network 199.9.9.0 mask 255.255.255.0

3、Check BGP routing table on R1 R2 R3.

R2#show ip bgp

Network Next Hop Metric LocPrf Weight Path

*> 199.9.9.0 0.0.0.0 0 32768 i

r>i200.100.50.0 172.24.1.17 0 100 0 i

R3#show ip bgp

Network Next Hop Metric LocPrf Weight Path

r>i199.9.9.0 172.24.1.18 0 100 0 i

R1#show ip bgp

Network Next Hop Metric LocPrf Weight Path

r>i200.100.50.0 192.168.1.6 0 100 0 i

R1#show ip route

R 200.100.50.0/24 [120/1] via 192.168.1.6, 00:00:11, Serial0/0

R 172.24.0.0/16 [120/1] via 192.168.1.6, 00:00:11, Serial0/0

192.168.1.0/30 is subnetted, 1 subnets

C 192.168.1.4 is directly connected, Serial0/0

As it’s not a full mesh, so R1 can not learn BGP route from R2 because of the BGP split horizon attribute.

4、Enable route reflector on R3 to solve this issue.

R3(config)#router bgp 100

R3(config-router)#neighbor 192.168.1.5 route-reflector-client

R3(config-router)#neighbir 172.24.1.18 route-reflector-client

R1#show ip bgp

Network Next Hop Metric LocPrf Weight Path

*>i199.9.9.0 172.24.1.18 0 100 0 i

*>i200.100.50.0 192.168.1.6 0 100 0 i

R1#show ip route

B 199.9.9.0/24 [200/0] via 172.24.1.18, 00:00:52

B 200.100.50.0/24 [200/0] via 192.168.1.6, 00:01:48

R 172.24.0.0/16 [120/1] via 192.168.1.6, 00:00:14, Serial0/0

192.168.1.0/30 is subnetted, 1 subnets

C 192.168.1.4 is directly connected, Serial0/0

Now R1 could learn BGP route from R2.

By www.ccieuniversity.com

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