BGP策略实验

1.配置ip，路由，broadcast

[r1]int g 0/0/0 [r1-GigabitEthernet0/0/0]ip add 12.0.0.1 24 [r1-GigabitEthernet0/0/0]int g 0/0/1 [r1-GigabitEthernet0/0/1]ip add 13.0.0.1 24 [r1-GigabitEthernet0/0/1]int g 0/0/2 [r1-GigabitEthernet0/0/2]ip add 15.0.0.1 24 [r1-GigabitEthernet0/0/2]q [r1]int l 0 [r1-LoopBack0]ip add 1.1.1.1 32 [r1-LoopBack0]int l 1 [r1-LoopBack1]ip add 192.168.100.1 24 [r1-LoopBack1]ospf network-type broadcast [r2]int g 0/0/0 [r2-GigabitEthernet0/0/0]ip add 24.0.0.2 24 [r2-GigabitEthernet0/0/0]int g 0/0/1 [r2-GigabitEthernet0/0/1]ip add 12.0.0.2 24 [r2-GigabitEthernet0/0/1]int l 0 [r2-LoopBack0]ip add 2.2.2.2 32 [r2-LoopBack0]int l 1 [r2-LoopBack1]ip add 192.168.20.1 24 [r2-LoopBack1]ospf network-type broadcast [r3]int g 0/0/0 [r3-GigabitEthernet0/0/0]ip add 34.0.0.3 24 [r3-GigabitEthernet0/0/0]int g 0/0/1 [r3-GigabitEthernet0/0/1]ip add 13.0.0.3 24 [r3-GigabitEthernet0/0/1]int l 0 [r3-LoopBack0]ip add 3.3.3.3 32 [r3-LoopBack0]int l 1 [r3-LoopBack1]ip add 192.168.30.1 24 [r3-LoopBack1]ospf network-type broadcast [r4]int g 0/0/0 [r4-GigabitEthernet0/0/0]ip add 24.0.0.4 24 [r4-GigabitEthernet0/0/0]int g 0/0/1 [r4-GigabitEthernet0/0/1]ip add 34.0.0.4 24 [r4-GigabitEthernet0/0/1]int l 0 [r4-LoopBack0]ip add 192.168.1.1 24 [r4-LoopBack0]int l 1 [r4-LoopBack1]ip add 192.168.2.1 24 [r4-LoopBack1]int l 2 [r4-LoopBack2]ip add 192.168.3.1 24 [r5]int g 0/0/0 [r5-GigabitEthernet0/0/0]ip add 15.0.0.5 24 [r5-GigabitEthernet0/0/0]int l 0 [r5-LoopBack0]ip add 192.168.10.1 24 [r5-LoopBack0]int l 1 [r5-LoopBack1]ip add 192.168.11.1 24 [r5-LoopBack1]int l 2 [r5-LoopBack2]ip add 192.168.12.1 24

2.AS 123 配置ospf

[r1]ospf 1 router-id 1.1.1.1 [r1-ospf-1]area 0 [r1-ospf-1-area-0.0.0.0]network 1.1.1.1 0.0.0.0 [r1-ospf-1-area-0.0.0.0]network 192.168.100.1 0.0.0.0 [r1-ospf-1-area-0.0.0.0]network 12.0.0.1 0.0.0.0 [r1-ospf-1-area-0.0.0.0]network 13.0.0.1 0.0.0.0 [r2]ospf 1 router-id 2.2.2.2 [r2-ospf-1]area 0 [r2-ospf-1-area-0.0.0.0]network 12.0.0.2 0.0.0.0 [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 192.168.20.1 0.0.0.0 [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 0.0.0.0 [r3-ospf-1-area-0.0.0.0]network 192.168.30.1 0.0.0.0 [r3-ospf-1-area-0.0.0.0]network 13.0.0.3 0.0.0.0

3.配置bgp

[r1]bgp 123 [r1-bgp]route-select [r1-bgp]router-id 1.1.1.1 [r1-bgp]peer 15.0.0.5 as-number 500 [r1-bgp]peer 2.2.2.2 as-number 123 [r1-bgp]peer 2.2.2.2 connect-interface LoopBack 0 [r1-bgp]peer 2.2.2.2 next-hop-local [r1-bgp]peer 3.3.3.3 as-number 123 [r1-bgp]peer 3.3.3.3 connect-interface LoopBack 0 [r1-bgp]peer 3.3.3.3 next-hop-local [r2]bgp 123 [r2-bgp]router-id 2.2.2.2 [r2-bgp]peer 24.0.0.4 as-number 400 [r2-bgp]peer 1.1.1.1 as-number 123 [r2-bgp]peer 1.1.1.1 connect-interface LoopBack 0 [r2-bgp]peer 1.1.1.1 next-hop-local [r3]bgp 123 [r3-bgp]router-id 3.3.3.3 [r3-bgp]peer 34.0.0.4 as-number 400 [r3-bgp]peer 1.1.1.1 as-number 123 [r3-bgp]peer 1.1.1.1 connect-interface LoopBack 0 [r3-bgp]peer 1.1.1.1 next-hop-local [r4]bgp 400 [r4-bgp]router-id 4.4.4.4 [r4-bgp]peer 24.0.0.2 as-number 123 [r4-bgp]peer 34.0.0.3 as-number 123 [r5]bgp 500 [r5-bgp]router-id 5.5.5.5 [r5-bgp]peer 15.0.0.1 as-number 123 [r1]bgp 123 [r1-bgp]network 192.168.20.0 24 [r1-bgp]network 192.168.30.0 24 [r1-bgp]network 192.168.100.0 24 [r2]bgp 123 [r2-bgp]network 192.168.20.0 24 [r2-bgp]network 192.168.30.0 24 [r2-bgp]network 192.168.100.0 24 [r3]bgp 123 [r3-bgp]network 192.168.20.0 24 [r3-bgp]network 192.168.30.0 24 [r3-bgp]network 192.168.100.0 24

4.使用Preval策略

[r4]ip ip-prefix aa permit 192.168.10.0 24 [r4]route-policy aa permit node 10 Info: New Sequence of this List. [r4-route-policy]if-match ip-prefix aa [r4-route-policy]apply preferred-value 100 [r4-route-policy]q [r4]route-policy aa permit node 20 Info: New Sequence of this List. [r4-route-policy]q [r4]bgp 400 [r4-bgp]peer 24.0.0.2 route-policy aa import

5.使用As_Path策略

[r4]ip ip-prefix bb permit 192.168.11.0 24 [r4]route-policy aa permit node 15 Info: New Sequence of this List. [r4-route-policy]if-match ip-prefix bb [r4-route-policy]apply as-path 123 123 500 overwrite

6.配置MED策略

[r2]ip ip-prefix aa permit 192.168.12.0 24 [r2]route-policy aa permit node 10 Info: New Sequence of this List. [r2-route-policy]if-match ip-prefix aa [r2-route-policy]apply cost 200 [r2-route-policy]q [r2]route-policy aa permit node 20 Info: New Sequence of this List. [r2-route-policy]q [r2]bgp 123 [r2-bgp]peer 24.0.0.4 route-policy aa export [r3]ip ip-prefix aa permit 192.168.12.0 24 [r3]route-policy aa permit node 10 Info: New Sequence of this List. [r3-route-policy]if-match ip-prefix aa [r3-route-policy]apply cost 20 [r3-route-policy]q [r3]route-policy aa permit node 20 Info: New Sequence of this List. [r3-route-policy]q [r3]bgp 123 [r3-bgp]peer 34.0.0.4 route-policy aa export

7.使用Local Preference策略

[r1]ip ip-prefix aa permit 192.168.1.0 24 [r1]ip ip-prefix bb permit 192.168.2.0 24 [r1]route-policy aa permit node 10 Info: New Sequence of this List. [r1-route-policy]if-match ip-prefix aa [r1-route-policy]apply local-preference 200 [r1-route-policy]q [r1]route-policy aa permit node 20 Info: New Sequence of this List. [r1-route-policy]q [r1]route-policy bb permit node 10 Info: New Sequence of this List. [r1-route-policy]if-match ip-prefix bb [r1-route-policy]apply local-preference 200 [r1-route-policy]q [r1]route-policy bb permit node 20 Info: New Sequence of this List. [r1-route-policy]q [r1]bgp 123 [r1-bgp]peer 2.2.2.2 route-policy aa import [r1-bgp]peer 3.3.3.3 route-policy bb import

8.配置负载均衡

[r1]bgp 123 [r1-bgp]maximum load-balancing 2 [r5]ip as-path-filter 1 deny ^123$ [r5]ip as-path-filter 1 permit .* [r5]bgp 500 [r5-bgp]peer 15.0.0.1 as-path-filter 1 import [r1]ip ip-prefix cc permit 192.168.3.0 24 [r1]route-policy aa permit node 15 Info: New Sequence of this List. [r1-route-policy]if-match ip-prefix cc [r1-route-policy]apply community no-export [r1-route-policy]q [r1]route-policy bb permit node 15 Info: New Sequence of this List. [r1-route-policy]if-match ip-prefix cc [r1-route-policy]apply community no-export