拓扑设计1 配置IP地址
2 在r2 3 4 5 6上开启ospf
[r2]ospf 1 router-id 2.2.2.2
[r2-ospf-1]area 0
[r2-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0
[r2-ospf-1-area-0.0.0.0]network 24.1.1.0 0.0.0.255
[r2-ospf-1-area-0.0.0.0]network 23.1.1.0 0.0.0.255
[r2-ospf-1-area-0.0.0.0]network 12.1.1.0 0.0.0.255

[r3]ospf 1 router-id 3.3.3.3
[r3-ospf-1]area 0
[r3-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0…0
[r3-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0
[r3-ospf-1-area-0.0.0.0]network 35.1.1.0 0.0.0.255
[r3-ospf-1-area-0.0.0.0]network 23.1.1.0 0.0.0.255
[r3-ospf-1-area-0.0.0.0]network 13.1.1.0 0.0.0.255

[r4]ospf 1 router-id 4.4.4.4
[r4-ospf-1]area 0
[r4-ospf-1-area-0.0.0.0]network 4.4.4.4 0.0.0.0
[r4-ospf-1-area-0.0.0.0]network 46.1.1.0 0.0.0.255
[r4-ospf-1-area-0.0.0.0]network 45.1.1.0 0.0.0.255
[r4-ospf-1-area-0.0.0.0]network 24.1.1.0 0.0.0.255

[r5]ospf 1 router-id 5.5.5.5
[r5-ospf-1]area 0
[r5-ospf-1-area-0.0.0.0]network 5.5.5.5 0.0.0.0
[r5-ospf-1-area-0.0.0.0]network 35.1.1.0 0.0.0.255
[r5-ospf-1-area-0.0.0.0]network 45.1.1.0 0.0.0.255
[r5-ospf-1-area-0.0.0.0]network 56.1.1.0 0.0.0.255

[r6]ospf 1 router-id 6.6.6.6
[r6-ospf-1]area 0
[r6-ospf-1-area-0.0.0.0]network 6.6.6.6 0.0.0.0
[r6-ospf-1-area-0.0.0.0]network 46.1.1.0 0.0.0.255
[r6-ospf-1-area-0.0.0.0]network 56.1.1.0 0.0.0.255
3 开启bgp，为了备份r2 5 r 34也建立邻居
[r1]bgp 1
[r1-bgp]router-id 1.1.1.1
[r1-bgp]peer 12.1.1.2 as-number 2
[r1-bgp]peer 13.1.1.2 as-number 2

[r2]bgp 2
[r2-bgp]router
[r2-bgp]router-id 2.2.2.2
[r2-bgp]peer 12.1.1.1 as
[r2-bgp]peer 12.1.1.1 as-number 1
[r2-bgp]peer 3.3.3.3 as-number 2
[r2-bgp]peer 3.3.3.3 connect-interface LoopBack 0
[r2-bgp]peer 4.4.4.4 as-number 2
[r2-bgp]peer 4.4.4.4 connect-interface LoopBack 0
[r2-bgp]peer 5.5.5.5 as-number 2
[r2-bgp]peer 5.5.5.5 connect-interface LoopBack 0

[r3]bgp 2
[r3-bgp]router-id 3.3.3.3
[r3-bgp]peer 13.1.1.1 as-number 1
[r3-bgp]peer 2.2.2.2 as-number 2
[r3-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[r3-bgp]peer 5.5.5.5 as-number 2
[r3-bgp]peer 5.5.5.5 connect-interface LoopBack 0
[r3-bgp]peer 4.4.4.4 as-number 2
[r3-bgp]peer 4.4.4.4 connect-interface LoopBack 0

[r4]bgp 2
[r4-bgp]router
[r4-bgp]router-id 4.4.4.4
[r4-bgp]peer 5.5.5.5 as-number 2
[r4-bgp]peer 5.5.5.5 connect-interface LoopBack 0
[r4-bgp]peer 6.6.6.6 as-number 2
[r4-bgp]peer 6.6.6.6 connect-interface LoopBack 0
[r4-bgp]peer 2.2.2.2 as-number 2
[r4-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[r4-bgp]peer 3.3.3.3 as-number 2
[r4-bgp]peer 3.3.3.3 connect-interface LoopBack 0

[r5]bgp 2
[r5-bgp]router-id 5.5.5.5
[r5-bgp]peer 6.6.6.6 as-number 2
[r5-bgp]peer 6.6.6.6 connect-interface LoopBack 0
[r5-bgp]peer 4.4.4.4 as-number 2
[r5-bgp]peer 4.4.4.4 connect-interface LoopBack 0
[r5-bgp]peer 3.3.3.3 as-number 2
[r5-bgp]peer 3.3.3.3 connect-interface LoopBack 0
[r5-bgp]peer 2.2.2.2 as-number 2
[r5-bgp]peer 2.2.2.2 connect-interface LoopBack 0

[r6]bgp 2
[r6-bgp]router-id 6.6.6.6
[r6-bgp]peer 4.4.4.4 as-number 2
[r6-bgp]peer 4.4.4.4 connect-interface LoopBack 0
[r6-bgp]peer 5.5.5.5 as-number 2
[r6-bgp]peer 5.5.5.5 connect-interface LoopBack 0

4 在r4 5上配置RR
[r4-bgp]peer 2.2.2.2 reflect-client
[r5-bgp]peer 3.3.3.3 reflect-client

5 宣告
[r1-bgp]network 1.1.1.0 24
[r1-bgp]network 1.1.2.0 24
[r2-bgp]network 2.2.2.0 24
[r3-bgp]network 3.3.3.0 24
[r4-bgp]network 4.4.4.0 24
[r5-bgp]network 5.5.5.0 24
[r6-bgp]network 6.6.6.0 24
6 负载分担
[r3]ip ip-prefix p permit 1.1.1.0 24
[r3]route-policy p permit node 10
[r3-route-policy]if-match ip-prefix p
[r3-route-policy] apply preferred-value 1
[r3-route-policy]q
[r3]route-policy p permit node 20
[r3-route-policy]q
[r3]bgp 2
[r3-bgp]peer 6.6.6.6 route-policy p import

[r4]ip ip-prefix p permit 1.1.1.0 24
[r4]route-policy p permit node 10
[r4-route-policy]if-match ip-prefix p
[r4-route-policy] apply preferred-value 1
[r4-route-policy]q
[r4]route-policy p permit node 20
[r4-route-policy]q
[r4]bgp 2
[r4-bgp]peer 6.6.6.6 route-policy p import