配置地址，AS123使用ospf保證通訊，修改接口類型保證ospf學習環回20.0,30.0,100.0?地址時，是以24位掩碼學習，R1，R2，R3都處于BGP邊界，各自都需要宣告三者的私網環回
1，
[R4]ip ip-prefix aa permit 192.168.10.0 24
[R4]route-policy aa permit node 10??
[R4-route-policy]if-match ip-prefix aa
[R4-route-policy]apply preferred-value 100??? ?
[R4]route-policy aa permit node 20
[R4]bgp 400?
[R4-bgp]peer 42.1.1.2 route-policy aa import?
[R4-bgp]
?
2，?
[R4]ip ip-prefix bb permit 192.168.11.0 24? ?
[R4]route-policy aa permit node 15
[R4-route-policy]if-match ip-prefix bb? ?
[R4-route-policy]apply as-path 123 123 500 overwrite ---使用已出現的AS號
Warning: The AS-Path lists of routes to which this route-policy is applied will?
be overwritten. Continue? [Y/N]y
?3，R2
[Huawei]ip ip-prefix aa permit 192.168.12.0 24? ?
[Huawei]route-policy aa permit node 10??? ?
[Huawei-route-policy]if-match ip-prefix aa
[Huawei-route-policy]apply cost 200??
[Huawei]route-policy aa permit node 20??
[Huawei]bgp 123?
[Huawei-bgp]peer 42.1.1.4 route-policy aa export?
R3：?
?[Huawei]ip ip-prefix aa permit 192.168.12.0 24? ?
[Huawei]route-policy aa permit node 10??? ?
[Huawei-route-policy]if-match ip-prefix aa
[Huawei-route-policy]apply cost 20??
[Huawei]route-policy aa permit node 20??
[Huawei]bgp 123?
[Huawei-bgp]peer 43.1.1.4 route-policy aa export?
4，5
[Huawei]ip ip-prefix aa permit 192.168.1.0 24??
[Huawei]ip ip-prefix bb permit 192.168.2.0 24
[Huawei]route-policy aa permit node 10
[Huawei-route-policy]if-match ip-prefix aa??
[Huawei-route-policy]apply local-preference 200
[Huawei]route-policy aa permit node 20? ?
[Huawei]route-policy bb permit node 10? ?
[Huawei-route-policy]if-match ip-prefix bb?? ??
[Huawei-route-policy]apply local-preference 200?
[Huawei]route-policy bb permit node 20?
[Huawei]bgp?? ?
[Huawei]bgp 123?
[Huawei-bgp]peer 2.2.2.2 route-policy aa import?
[Huawei-bgp]peer 3.3.3.3 route-policy bb import?
[Huawei-bgp]
6，
[Huawei]bgp 123?
[Huawei-bgp]maximum load-balancing 2
?7，
? ??
[Huawei]ip as-path-filter 1 deny ^123$??
[Huawei]ip as-path-filter 1 permit .*
[Huawei]bgp 500??
[Huawei-bgp]peer 15.1.1.1 as-path-filter 1 import
8，
[Huawei]ip ip-prefix cc permit 192.168.3.0 24
[Huawei]route-policy aa permit node 15??
[Huawei-route-policy]if-match ip-prefix cc??
[Huawei-route-policy]apply community no-export
[Huawei]route-policy bb permit node 15??
[Huawei-route-policy]if-match ip-prefix cc
[Huawei-route-policy]apply community no-export
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