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原创最新推荐文章于 2026-02-17 00:14:44 发布 179 阅读 AI 写同款· GEO 优化 ›

BGP路径选择（Local-Preference）实验 Local-Preference属性、local-Preference实验阅读详情

拓扑图：

要求：

要求：
1、使用PreVal策略，确保R4通过R2到达192.168.10.0/24

2、使用AS_Path策略，确保R4通过R3到达192.168.11.0/24
3、配置MED策略，确保R4通过R3到达192.168.12.0/24
4、使用LocalPreference策略，确保R1通过R2到达192.168.1.0/24
5、使用LocalPreference策略,确保R1通过R3到达192.168.2.0/24
6、配置负载均衡，确保R1通过R2和R3到达192.168.3.0/24
7、使用AS策略，AS500不接受任何始发于AS123的路由
8、使用自定义community策略，确保192.168.3.0/24路由不会被发布到As500
9、IBGP使用环回接口建邻，EBGP使用物理接口建邻
10、修改AS123中的用户网段为Broadcast，方便后续在BGp中宣告
11、BGP宣告路由时，仅宣告24网段的用户路由

配置：

[r1]interface g 0/0/0
[r1-GigabitEthernet0/0/0]ip address 21.0.0.2 24
[r1]interface g 0/0/1
[r1-GigabitEthernet0/0/1]ip address 31.0.0.2 24
[r1]interface g 0/0/2
[r1-GigabitEthernet0/0/2]ip address 15.0.0.1 24
[r1]interface LoopBack 0
[r1-LoopBack0]ip address 1.1.1.1 32
[r1]interface LoopBack 1
[r1-LoopBack1]ip address 192.168.100.1 24

[r1]ospf 1 router-id 1.1.1.1
[r1-ospf-1]a 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 192.168.100.0 0.0.0.255
[r1-ospf-1-area-0.0.0.0]network 21.0.0.2 0.0.0.0
[r1-ospf-1-area-0.0.0.0]network 31.0.0.2 0.0.0.0
[r1-ospf-1-area-0.0.0.0]network 15.0.0.1 0.0.0.0

[r1]bgp 123
[r1-bgp]ro	
[r1-bgp]router-id 1.1.1.1
[r1-bgp]peer 2.2.2.2 as-number 123
[r1-bgp]peer 2.2.2.2 connect-interface l	
[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-n	
[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 nex	
[r1-bgp]peer 3.3.3.3 next-hop-	
[r1-bgp]peer 3.3.3.3 next-hop-local
[r1-bgp]peer 5.5.5.5 as-	
[r1-bgp]peer 5.5.5.5 as-number 500
[r1-bgp]undo peer 5.5.5.5 
[r1-bgp]peer 15.0.0.2 as-n	
[r1-bgp]peer 15.0.0.2 as-number 500
[r1-bgp]net	
[r1-bgp]network 192.168.100.0 24

后面路由策略不会做了，等上课讲了

[r2]interface g 0/0/0
[r2-GigabitEthernet0/0/0]ip address 42.0.0.2 24
[r2]interface g 0/0/1
[r2-GigabitEthernet0/0/1]ip address 21.0.0.1 24
[r2]interface loop	
[r2]interface LoopBack 0
[r2-LoopBack0]ip add	
[r2-LoopBack0]ip address 2.2.2.2 32
[r2]interface LoopBack 1
[r2-LoopBack1]ip address 192.168.20.1 24

[r2]ospf 1 r	
[r2]ospf 1 router-id 2.2.2.2
[r2-ospf-1]a 0
[r2-ospf-1-area-0.0.0.0]net	
[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]ne	
[r2-ospf-1-area-0.0.0.0]network 192.168.20.0 0.0.0.255
[r2-ospf-1-area-0.0.0.0]ne	
[r2-ospf-1-area-0.0.0.0]network 42.0.0.2 0.0.0.0
[r2-ospf-1-area-0.0.0.0]ne	
[r2-ospf-1-area-0.0.0.0]network 21.0.0.1 0.0.0.0

[r2]bgp 123
[r2-bgp]r	
[r2-bgp]rou	
[r2-bgp]router-id 2.2.2.2
[r2-bgp]peer 42.0.0.1 as-n	
[r2-bgp]peer 42.0.0.1 as-number 400
[r2-bgp]peer 1.1.1.1 as-n	
[r2-bgp]peer 1.1.1.1 as-number 400
[r2-bgp]peer 1.1.1.1 co	
[r2-bgp]peer 1.1.1.1 connect-interface l	
[r2-bgp]peer 1.1.1.1 connect-interface LoopBack 0
[r2-bgp]peer 1.1.1.1 nex	
[r2-bgp]peer 1.1.1.1 next-hop-l	
[r2-bgp]peer 1.1.1.1 next-hop-local 
[r2-bgp]netw	
[r2-bgp]network 192.168.20.0 24

后面路由策略不会做了

[r3]interface g 0/0/0
[r3-GigabitEthernet0/0/0]ip address 43.0.0.2 24
[r3-GigabitEthernet0/0/0]q
[r3]interface g 0/0/1
[r3-GigabitEthernet0/0/1]ip add	
[r3-GigabitEthernet0/0/1]ip address 31.0.0.1 24
[r3-GigabitEthernet0/0/1]q
[r3]interface LoopBack 0
[r3-LoopBack0]ip address 3.3.3.3 32
[r3-LoopBack0]q
[r3]interface LoopBack 1
[r3-LoopBack1]ip add	
[r3-LoopBack1]ip address 192.168.30.1 24
[r3-LoopBack1]q

[r3]ospf 1 r	
[r3]ospf 1 router-id 3.3.3.3
[r3-ospf-1]a 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 192.168.30.0 0.0.0.255
[r3-ospf-1-area-0.0.0.0]network 43.0.0.2 0.0.0.0
[r3-ospf-1-area-0.0.0.0]network 31.0.0.1 0.0.0.0
[r3-ospf-1-area-0.0.0.0]q
[r3-ospf-1]q


[r3]bgp 123
[r3-bgp]router-id 3.3.3.3
[r3-bgp]peer 43.0.0.1 as-n	
[r3-bgp]peer 43.0.0.1 as-number 400
[r3-bgp]peer 1.1.1.1 as-n	
[r3-bgp]peer 1.1.1.1 as-number 123
[r3-bgp]peer 1.1.1.1 co	
[r3-bgp]peer 1.1.1.1 connect-interface l	
[r3-bgp]peer 1.1.1.1 connect-interface LoopBack 0
[r3-bgp]peer 1.1.1.1 nex	
[r3-bgp]peer 1.1.1.1 next-hop-l	
[r3-bgp]peer 1.1.1.1 next-hop-local 
[r3-bgp]network 192.168.30.0 24

后面路由策略不会做了

[r4]inter	
[r4]interface g 0/0/0
[r4-GigabitEthernet0/0/0]ip address 42.0.0.1 24
[r4-GigabitEthernet0/0/0]q
[r4]interface g 0/0/1
[r4-GigabitEthernet0/0/1]ip add	
[r4-GigabitEthernet0/0/1]ip address 43.0.0.1 24
[r4-GigabitEthernet0/0/1]q
[r4]interface LoopBack 0	
[r4-LoopBack0]ip address 192.168.1.1 24
[r4-LoopBack0]q
[r4]interface LoopBack 1
[r4-LoopBack1]ip address 192.168.2.1 24
[r4-LoopBack1]q
[r4]interface LoopBack 2
[r4-LoopBack2]ip address 192.168.3.1 24
[r4-LoopBack2]q

[r4]bgp 400
[r4-bgp]router-id 4.4.4.4
[r4-bgp]peer 42.0.0.2 as-	
[r4-bgp]peer 42.0.0.2 as-path-filter	
[r4-bgp]peer 42.0.0.2 as-number 123
[r4-bgp]peer 43.0.0.2 as-n	
[r4-bgp]peer 43.0.0.2 as-number 123
[r4-bgp]net	
[r4-bgp]network 192.168.1.0 24
[r4-bgp]network 192.168.2.0 24
[r4-bgp]network 192.168.3.0 24

后面路由策略不会做

[r5]inter	
[r5]interface g 0/0/0
[r5-GigabitEthernet0/0/0]ip add	
[r5-GigabitEthernet0/0/0]ip address 15.0.0.2 24
[r5-GigabitEthernet0/0/0]q	
[r5]interface LoopBack 0
[r5-LoopBack0]ip address 192.168.10.1 24
[r5-LoopBack0]q
[r5]interface LoopBack 1
[r5-LoopBack1]ip address 192.168.11.1 24
[r5-LoopBack1]q
[r5]interface LoopBack 2
[r5-LoopBack2]ip address 192.168.12.1 24
[r5-LoopBack2]q

[r5]bgp 500
[r5-bgp]router-id 5.5.5.5
[r5-bgp]peer 15.0.0.1 as-n	
[r5-bgp]peer 15.0.0.1 as-number 123
[r5-bgp]network 192.168.10.0 24
[r5-bgp]network 192.168.11.0 24
[r5-bgp]network 192.168.12.0 24

后面路由策略不会做