首先預配ip位址
內部igp
as間bgp建鄰
as1-as2走r1-r3,增大r2-r4的local-preference
字首列表
[r2]ip ip-prefix 12 permit 10.1.0.0 16 greater-equal 32
[r2]ip ip-prefix 12 permit 10.2.0.0 16 greater-equal 32
匹配字首列表
[r2]route-policy 12 permit node 10
[r2-route-policy]if-match ip-prefix 12
[r2]route-policy 12 permit node 20
呼叫[r2]bgp 1
[r2-bgp]peer 10.0.24.1 route-policy 12 import
as2-as1走r2-r4,增大r2-r4的med[r3]ip ip-prefix 21 permit 10.4.0.0 16 greater-equal 32
[r3]ip ip-prefix 21 permit 10.3.0.0 16 greater-equal 32
[r3]route-policy 21 permit node 10
[r3-route-policy]if-match ip-prefix 21
[r3]route-policy 12 permit node 20
[r3]bgp 2
[r3-bgp]peer 10.0.13.1 route-policy 21 import
as1-as3走r2-r6,增加r2-r5的as-path[r2]ip ip-prefix 13 permit 10.1.0.0 16 greater-equal 32
[r2]ip ip-prefix 13 permit 10.2.0.0 16 greater-equal 32
[r2]route-policy 13 permit node 10
[r2-route-policy]if-match ip-prefix 13
[r2]route-policy 13 permit node 20
[r2]bgp 1
[r2-bgp]peer 10.0.25.1 route-policy 13 import
as2-as3走r4-r6,修改r4-r6的起源屬性[r4]ip ip-prefix 23 permit 10.5.0.0 16 greater-equal 32
[r4]ip ip-prefix 23 permit 10.6.0.0 16 greater-equal 32
[r4]ip ip-prefix 23 permit 10.7.0.0 16 greater-equal 32
[r4]route-policy 23 permit node 10
[r4-route-policy]if-match ip-prefix 23
[r4]route-policy 23 permit node 20
[r4]bgp 2
[r4-bgp]peer 10.0.46.1 route-policy 32 import
as3-as1走r5-r2,修改r6-r2的下一跳[r6]ip ip-prefix 31 permit 10.5.0.0 16 greater-equal 16
[r6]ip ip-prefix 31 permit 10.6.0.0 16 greater-equal 16
[r6]ip ip-prefix 31 permit 10.7.0.0 16 greater-equal 16
[r6]route-policy 13 permit node 10
[r6-route-policy]if-match ip-prefix 31
[r6]route-policy 13 permit node 20
[r6]bgp 3
[r6-bgp]peer 10.0.26.2 route-policy 31 import
as3-as2走r6-r4,修改r5-r6prefval屬性[r5]ip ip-prefix 32 permit 10.4.0.0 16 greater-equal 16
[r5]ip ip-prefix 32 permit 10.3.0.0 16 greater-equal 16
[r5]route-policy 32 permit node 10
[r5-route-policy]if-match ip-prefix 32
[r5]route-policy 32 permit node 20
[r5]bgp 3
[r5-bgp]peer 10.6.1.1 route-policy 32 import
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