bgp策略实验

1.配置ip

[R1]int l 0
[R1-LoopBack0]ip add 1.1.1.1 32
[R1-LoopBack0]int l1
[R1-LoopBack1]ip add 192.168.100.1 24
[R1-LoopBack1]int g 0/0/0
[R1-GigabitEthernet0/0/0]ip add 12.0.0.2 24
[R1-GigabitEthernet0/0/0]int g 0/0/1
[R1-GigabitEthernet0/0/1]ip add 13.0.0.2 24
[R1-GigabitEthernet0/0/1]int g 0/0/2
[R1-GigabitEthernet0/0/2]ip add 15.0.0.1 24
 
[R2]int l0
[R2-LoopBack0]ip add 2.2.2.2 32
[R2-LoopBack0]int l1
[R2-LoopBack1]ip add 192.168.20.1 24
[R2-LoopBack1]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 12.0.0.1 24
 
[R3]int l0
[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]int g 0/0/0
[R3-GigabitEthernet0/0/0]ip add 34.0.0.2 24
[R3-GigabitEthernet0/0/0]int g 0/0/1
[R3-GigabitEthernet0/0/1]ip add 13.0.0.1 24
 
 
[R4]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
[R4-LoopBack2]int g0/0/0
[R4-GigabitEthernet0/0/0]ip add 24.0.0.1 24
[R4-GigabitEthernet0/0/0]int g 0/0/1
[R4-GigabitEthernet0/0/1]ip add 34.0.0.1 24
 
[R5]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
[R5-LoopBack2]int g 0/0/0
[R5-GigabitEthernet0/0/0]ip add 15.0.0.2 24

2.IGP配置

[R1]ospf 1 rou 1.1.1.1
[R1-ospf-1]a 0
[R1-ospf-1-area-0.0.0.0]net 1.1.1.1 0.0.0.0
[R1-ospf-1-area-0.0.0.0]net 12.0.0.2 0.0.0.0
[R1-ospf-1-area-0.0.0.0]net 13.0.0.2 0.0.0.0
[R1-ospf-1-area-0.0.0.0]net 192.168.100.1 0.0.0.0
 
[R2]ospf 1 rou 2.2.2.2
[R2-ospf-1]a 0
[R2-ospf-1-area-0.0.0.0]net 2.2.2.2 0.0.0.0
[R2-ospf-1-area-0.0.0.0]net 192.168.20.1 0.0.0.0
[R2-ospf-1-area-0.0.0.0]net 12.0.0.1 0.0.0.0
 
[R3]ospf 1 rou 3.3.3.3
[R3-ospf-1]a 0
[R3-ospf-1-area-0.0.0.0]net 3.3.3.3 0.0.0.0
[R3-ospf-1-area-0.0.0.0]net 192.168.30.1 0.0.0.0
[R3-ospf-1-area-0.0.0.0]net 13.0.0.1 0.0.0.0 

修改用户网段为Broadcast   
[R1-LoopBack1]ospf network-type broadcast 
[R2-LoopBack1]ospf network-type broadcast  
[R3-LoopBack1]ospf network-type broadcast 

3.BGP配置 --- 建立邻居关系

[R4]bgp 400
[R4-bgp]router-id 4.4.4.4
[R4-bgp]peer 24.0.0.2 as 123
[R4-bgp]peer 34.0.0.2 as 123
 
[R2]bgp 123
[R2-bgp]router-id 2.2.2.2
[R2-bgp]peer 24.0.0.1 as 400
[R2-bgp]peer 1.1.1.1 as 123
[R2-bgp]peer 1.1.1.1 con l0
[R2-bgp]peer 1.1.1.1 next-hop-local
 
[R3]bgp 123
[R3-bgp]router-id 3.3.3.3
[R3-bgp]peer 34.0.0.1 as 400
[R3-bgp]peer 1.1.1.1 as 123
[R3-bgp]peer 1.1.1.1 con l0
[R3-bgp]peer 1.1.1.1 next-hop-local
 
[R1]bgp 123
[R1-bgp]router-id 1.1.1.1
[R1-bgp]peer 2.2.2.2 as 123
[R1-bgp]peer 2.2.2.2 con l0
[R1-bgp]peer 2.2.2.2 next-hop-local
[R1-bgp]peer 3.3.3.3 as 123
[R1-bgp]peer 3.3.3.3 con l0
[R1-bgp]peer 3.3.3.3 next-hop-local
[R1-bgp]peer 15.0.0.2 as 500
 
[R5]bgp 500
[R5-bgp]router-id 5.5.5.5
[R5-bgp]peer 15.0.0.1 as 123

[R4]bgp 400
[R4-bgp]net 192.168.1.0 24
[R4-bgp]net 192.168.2.0 24
[R4-bgp]net 192.168.3.0 24
 
[R2]bgp 123
[R2-bgp]net 192.168.20.0 24
 
[R3]bgp 123
[R3-bgp]net 192.168.30.0 24
 
[R1]bgp 123
[R1-bgp]net 192.168.100.0 24
 
[R5]bgp 500
[R5-bgp]net 192.168.10.0 24
[R5-bgp]net 192.168.11.0 24
[R5-bgp]net 192.168.12.0 24

PV

[R4]ip ip-p    
[R4]ip ip-prefix pv permit 192.168.10.0 24
[R4]route-policy pv permit node 10
Info: New Sequence of this List.
[R4-route-policy]if-match ip-prefix pv
[R4-route-policy]apply preferred-value 100
[R4-route-policy]q
[R4]route-policy pv permit node 100
Info: New Sequence of this List.
[R4-route-policy]q
[R4]bgp 400
[R4-bgp]peer 24.0.0.2 route-policy pv import

AS_Path

[R4]ip ip-prefix as permit 192.168.11.0 24
[R4]route-policy pv permit node 20
Info: New Sequence of this List.
[R4-route-policy]if-match ip-prefix as
[R4-route-policy]apply as-path 123 additive
[R4-route-policy]q

MED

[R4]ip ip-prefix med permit 192.168.12.0 24
[R4]route-policy pv permit node 30
Info: New Sequence of this List.
[R4-route-policy]if-match ip-prefix med
[R4-route-policy]apply cost 20
[R4-route-policy]q

配置负载均衡，确保R1通过R2和R3到达192.168.3.0/24

[R1-bgp]maximum load-balancing 2

Local Preference

[R1]ip ip-prefix aa permit 192.168.1.0 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 100
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]ip ip-prefix bb permit 192.168.2.0 24
[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 100
Info: New Sequence of this List.
[R1-route-policy]q
[R1]bgp 123
[R1-bgp]peer 3.3.3.3 route-policy bb import

AS500不接受任何始发于A5 123的路由