BGP第二天

实验拓扑图如下：

 

实验要求：
1.r1访问r8的换回都走r5
2.r5访问r4的环回都走r1
3.r9访问r1的环回都走r8
4.使用联邦反射器使得全网可达

实验步骤：

1.底层配置，R1--R4用rip，R5--R8用ospf

2.划分联邦，如图所示，建立BGP关系

BGP建邻

R1                                                         

[r1]bgp 64512
[r1-bgp]router-id 1.1.1.1
[r1-bgp]confederation id 100    
[r1-bgp]confederation peer-as 64513
[r1-bgp]peer 2.2.2.2 as-number 64513    
[r1-bgp]peer 2.2.2.2 connect-interface lo 0
[r1-bgp]peer 2.2.2.2 ebgp-max-hop    
[r1-bgp]peer 15.1.1.2 as-number 101    
    
改下一跳，重发布，宣告直连    
[r1-bgp]import-route rip 1    
[r1-bgp]import-route direct 
[r1-bgp]peer 2.2.2.2 next-hop-local

R2
[r2]bgp 64513
[r2-bgp]router-id 2.2.2.2
[r2-bgp]confederation id 100    
[r2-bgp]confederation peer-as 64512    
[r2-bgp]peer 1.1.1.1 as-number 64512
[r2-bgp]peer 1.1.1.1 connect-interface lo0
[r2-bgp]peer 1.1.1.1 ebgp-max-hop
[r2-bgp]peer 3.3.3.3 as-number 64513    
[r2-bgp]peer 3.3.3.3 connect-interface lo0

[r2]bgp 64513
[r2-bgp]peer 3.3.3.3 next-hop-local 
[r2-bgp]peer 1.1.1.1 next-hop-local

R3    
[r3]bgp 64513
[r3-bgp]router-id 3.3.3.3
[r3-bgp]confederation id 100    
[r3-bgp]peer 2.2.2.2 as-number 64513    
[r3-bgp]peer 2.2.2.2 connect-interface lo0    
[r3-bgp]peer 4.4.4.4 as-number 64513    
[r3-bgp]peer 4.4.4.4 connect-interface lo0    
[r3-bgp]peer 4.4.4.4 reflect-client     
[r3-bgp]peer 2.2.2.2 reflect-client 

[r3]bgp 64513
[r3-bgp]peer 2.2.2.2 next-hop-local
[r3-bgp]peer 4.4.4.4 next-hop-local

R4
[r4]bgp 64513
[r4-bgp]router-id 4.4.4.4
[r4-bgp]confederation id 100
[r4-bgp]peer 3.3.3.3 as-number 64513
[r4-bgp]peer 3.3.3.3 connect-interface lo0
[r4-bgp]peer 48.1.1.2 as-number 101
[r4-bgp]peer 49.1.1.2 as-number 102

[r4]bgp 64513
[r4-bgp]import-route rip 1    
[r4-bgp]import-route direct 
[r4-bgp]peer 3.3.3.3 next-hop-local

R5

[r5]bgp 64514
[r5-bgp]router-id 5.5.5.5
[r5-bgp]confederation id 101
[r5-bgp]confederation peer-as 64515
[r5-bgp]peer 6.6.6.6 as-number 64515    
[r5-bgp]peer 6.6.6.6 connect-interface lo0
[r5-bgp]pe    
[r5-bgp]peer 6.6.6.6 e    
[r5-bgp]peer 6.6.6.6 ebgp-max-hop
[r5-bgp]peer 15.1.1.1 as-number 100

[r5]bgp 64514    
[r5-bgp]import-route ospf 100
[r5-bgp]import-route direct 
[r5-bgp]peer 6.6.6.6 next-hop-local

R6
[r6]bgp 64515
[r6-bgp]router-id 6.6.6.6    
[r6-bgp]confederation id 101
[r6-bgp]confederation peer-as 64514
[r6-bgp]peer 5.5.5.5 as-number 64514
[r6-bgp]peer 5.5.5.5 connect-interface lo 0    
[r6-bgp]peer 7.7.7.7 as-number 64515
[r6-bgp]peer 7.7.7.7 connect-interface lo0    
[r6-bgp]peer 5.5.5.5 ebgp-max-hop

[r6]bgp 64515
[r6-bgp]peer 5.5.5.5 next-hop-local
[r6-bgp]peer 7.7.7.7 next-hop-local

R7
[r7]bgp 64515
[r7-bgp]router-id 7.7.7.7    
[r7-bgp]confederation id 101    
[r7-bgp]peer 6.6.6.6 as-number 64515    
[r7-bgp]peer 6.6.6.6 connect-interface lo0    
[r7-bgp]peer 8.8.8.8 as-number 64515    
[r7-bgp]peer 8.8.8.8 connect-interface lo0    
[r7-bgp]peer 6.6.6.6 reflect-client     
[r7-bgp]peer 8.8.8.8 reflect-client 
[r7-bgp]peer 6.6.6.6 next-hop-local
[r7-bgp]peer 8.8.8.8 next-hop-local

R8
[r8]bgp 64515
[r8-bgp]router-id 8.8.8.8
[r8-bgp]confederation id 101    
[r8-bgp]peer 7.7.7.7 as-number 64515
[r8-bgp]peer 7.7.7.7 connect-interface lo 0    
[r8-bgp]peer 48.1.1.1 as-number 100
[r8-bgp]peer 89.1.1.2 as-number 102
[r8-bgp]import-route ospf 100    
[r8-bgp]import-route direct 
[r8-bgp]peer 7.7.7.7 next-hop-local 

R9
[r9]bgp 102
[r9-bgp]router-id 9.9.9.9
[r9-bgp]peer 49.1.1.1 as-number 100
[r9-bgp]peer 89.1.1.1 as-number 101
[r9-bgp]import-route direct 

此时全网可达，尝试ping

R1 ping R9

 

3.r1访问r8的换回都走r5

在R1上修改preferred-value值

抓流量

[r1]ip ip-prefix xx permit 8.8.8.8 32

[r1]route-policy yy permit node 10

Info: New Sequence of this List.

[r1-route-policy]if-match ip-prefix xx

[r1-route-policy]apply preferred-value 1

[r1]route-policy yy permit node 20

Info: New Sequence of this List.

调用

[r1]bgp 64512

[r1-bgp]peer 15.1.1.2 route-policy yy import

 

4.r5访问r4的环回都走r1

在R8上使用as-path 增加as号

[r8]ip ip-prefix xx permit 4.4.4.4 32

[r8]route-policy yy permit node 10

Info: New Sequence of this List.

[r8-route-policy]if-match ip-prefix xx

[r8-route-policy]apply as-path 3 3 3 additive

[r8]route-policy yy permit node 20

Info: New Sequence of this List.

调用

[r8]bgp 64515

[r8-bgp]peer 48.1.1.1 route-policy yy import

 

 5.r9访问r1的环回都走r8

在R9上增加R1到R9的as号

[r9]ip ip-prefix xx permit 1.1.1.1 32

[r9]route-policy yy permit node 10

Info: New Sequence of this List.

[r9-route-policy]if-match ip-prefix xx

[r9-route-policy]apply as-path 4 4 4 additive

[r9]route-policy yy permit node 20

Info: New Sequence of this List.

进方向调用

[r9]bgp 102

[r9-bgp]peer 49.1.1.1 route-policy yy import

 实验完成