HQY 一个和谐有爱的空间

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 第一步：IP配置

172.16.0.0 /16
骨干链路
172.16.0.0 /24
172.16.0.0 /30
172.16.0.4 /30
.......
172.16.0.20 /30
环回网段
172.16.1.0 /24
172.16.1.2 /32
.....
172.16.1.7 /32
用户网段
172.16.2.0 /24
172.16.3.0 /24
.....
172.16.7.0 /24

第二步：AS2内部使用ospf内部互通

R2上配置

[r2-ospf-1]area 0
[r2-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.255.255
 

R3上配置

[r3]ospf 1 router-id 3.3.3.3
[r3-ospf-1]area 0
[r3-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.255.255

R4上配置

[r4]ospf 1 ro 4.4.4.4
[r4-ospf-1]area 0
[r4-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.255.255

后面的类似
然后查看ospf路由表

 

 第三步：建立BGP对等体关系

R1上：

首先写一条静态指向R2建邻的环回网段

[r1]ip route-static 172.16.1.2 32 12.1.1.2

然后修改设置

r1]bgp 1
[r1-bgp]peer 172.16.1.2 as-number 2
[r1-bgp]peer 172.16.1.2 connect-interface l    
[r1-bgp]peer 172.16.1.2 connect-interface LoopBack 0  
[r1-bgp]peer 172.16.1.2 ebgp-max-hop 2

[r1-bgp]router-id 1.1.1.1

R2上：

也写一条静态指向R1建邻的环回网段

[r2]ip route-static 1.1.1.1 32 12.1.1.1

然后建邻

[r2]bgp 64512
[r2-bgp]router-id 2.2.2.2
[r2-bgp]confederation id 2  
[r2-bgp]peer 1.1.1.1 as-number 1
[r2-bgp]peer 1.1.1.1 connect-interface lo0
[r2-bgp]peer 1.1.1.1 ebgp-max-hop 2

[r2-bgp]confederation peer-as 64513   
Jul 31 2023 11:55:36-08:00 r2 %%01BGP/3/STATE_CHG_UPDOWN(l)[1]:The status of the
 peer 172.16.1.3 changed from OPENCONFIRM to ESTABLISHED. (InstanceName=Public, 
StateChangeReason=Up)  
[r2-bgp]peer 172.16.1.5 as-number 64513
r2-bgp]peer 172.16.1.5 connect-interface lo0
[r2-bgp]peer 1.1.1.1 ebgp-max-hop 2

R3上：

[r3]bgp 64512
[r3-bgp]confederation id 2
[r3-bgp]peer 172.16.0.2 as-number 64512
Warning: Local interface is already configured with this address.
[r3-bgp]peer 172.16.1.2 as-number 64512  
[r3-bgp]peer 172.16.1.2 connect-interface lo0
[r3-bgp]peer 172.16.1.4 as-number 64512
[r3-bgp]peer 172.16.1.4 connect-interface lo0

R4上

[r4]bgp 64512 
[r4-bgp]router-id 4.4.4.4 
[r4-bgp]confederation id 2   
[r4-bgp]peer 172.16.1.3 as-number 64512
[r4-bgp]peer 172.16.1.3 connect-interface lo0
[r4-bgp]confederation peer-as 64513  
[r4-bgp]peer 172.16.1.7 as-number 64513  
[r4-bgp]peer 172.16.1.7 connect-interface lo0
[r4-bgp]peer 172.16.1.7 ebgp-max-hop 2

R5上

[r5]bgp 64513
[r5-bgp]confederation id 2
[r5-bgp]peer 172.16.1.2 as-number 64512

[r5-bgp]peer 172.16.1.6 as 64513
[r5-bgp]peer 172.16.1.6 connect-interface lo0
 

R6上

[r6]bgp 64513

[r6-bgp]confederation id 2
[r6-bgp]peer 172.16.1.5 as    
[r6-bgp]peer 172.16.1.5 as-number 64513         

[r6-bgp]peer 172.16.1.5 connect-interface lo0
[r6-bgp]peer 172.16.1.7 as-number 64513
[r6-bgp]peer 172.16.1.7 connect-interface 

[r6-bgp]peer 172.16.1.7 connect-interface lo0

R7上

[r7]bgp 64513
[r7-bgp]confederation id 2
[r7-bgp]peer 172.16.1.6 as    
[r7-bgp]peer 172.16.1.6 as-number 64513
[r7-bgp]peer 172.16.1.6 con    
[r7-bgp]peer 172.16.1.6 connect-interface lo0  
[r7-bgp]confederation peer    
[r7-bgp]confederation peer-as 64512
[r7-bgp]peer 172.16.1.4 
[r7-bgp]peer 172.16.1.4 as    
[r7-bgp]peer 172.16.1.4 as-number 64512
[r7-bgp]peer 172.16.1.4 connect-interface lo0   
[r7-bgp]peer 172.16.1.4 ebgp-max-hop 2
[r7-bgp]peer 8.8.8.8 as-path-filter
[r7-bgp]peer 8.8.8.8 as-number 3
[r7-bgp]peer 8.8.8.8 con    
[r7-bgp]peer 8.8.8.8 connect-interface lo0
[r7-bgp]peer 8.8.8.8 e    
[r7-bgp]peer 8.8.8.8 ebgp-max-hop 2

[r7]ip route-static 8.8.8.8 32 78.1.1.8

R8上

[r8]bgp 3
[r8-bgp]peer 172.16.1.7 as-number 64513 
[r8-bgp]peer 172.16.1.7 connect-interface lo0
[r8-bgp]peer 172.16.1.7 ebgp-max-hop 2

[r8]ip route-static 172.16.1.7 32 78.1.1.7

 

 

 第四步在bgp中发布路由

先把所有用户网段的ospf类型改为broadcost

[r2]interface lo1
[r2-LoopBack1]ospf network-type broadcast 

[r3]interface lo1
[r3LoopBack1]ospf network-type broadcast 

[r4]interface lo1
[r4-LoopBack1]ospf network-type broadcast 

........

[r7]interface lo1
[r7-LoopBack1]ospf network-type broadcast 

 然后将R2和R7上本地下一跳改为自己

[r2-bgp]peer 172.16.1.3 next-hop-local 
[r2-bgp]peer 172.16.1.5 next-hop-local
[r7-bgp]peer 172.16.1.4 next-hop-loca
[r7-bgp]peer 172.16.1.6 next-hop-local

然后 在R2上宣告

[r2-bgp]network 172.16.2.0 24

[r2-bgp]network 172.16.3.0 24
[r2-bgp]network 172.16.4.0 2
[r2-bgp]network 172.16.5.0 24
[r2-bgp]network 172.16.6.0 24
[r2-bgp]network 172.16.7.0 24

 R1上

[r1-bgp]network 1.1.1.1 24

R8上

[r8-bgp]network 8.8.8.8 24

第五步：将R3和R6 设置为反射器

[r3-bgp]peer 172.16.1.2 reflect-client 

[r6-bgp]peer 172.16.1.7 reflect-client 

 

 

 第六步：做手工聚合

[r2-bgp]aggregate 172.16.0.0 21 detail-suppressed 

[r7-bgp]aggregate 172.16.0.0 21 detail-suppressed 

 最后创建GRE隧道实现两个环回的通讯

 [r8-Tunnel0/0/0]source 8.8.8.8
[r8-Tunnel0/0[r1-Tunnel0/0/0]destination 1.1.1.1
[r1-Tunnel0/0/0]destination 8.8.8.8
/0] source 1.1.1.1

[r8]ip route-static 192.168.1.0 24 Tunnel 0/0/0

[r1]ip route-static 192.168.2.0 24 Tunnel 0/0/0

 

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