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mpls跨域optionB

　　optionB的核心思想是私网路由传递过程是 PE-ASBR1-ASBR2-PE2 在传递过程中私网标签发生了变化（由ASBR重新分配了私网标签），而在数据平面（不考虑PHP机制）当数据包到达ASBR1时标签存在公网标签和私网标签两层，当转发给ASBR2时只有一层由ASBR2分配的私网标签，通过EBGP隧道迭代直接到达ASBR2，ASBR2再把私网标签替换成PE分配的标签并压入公网标签后转发。

　　所以在optionB中私网标签一共有三个，数据包标签最少时只有一层私网标签

　　optionB的缺点是ASBR设备需要维护到用户侧的VPNV4路由，占用大量设备资源，所以现网中如果使用optionB做为跨域方案，建议ASBR设备只做MPLS设备来使用

拓扑

 

 编址

1. 底层互联地址ospf,域内mpls ldp配置略

1. 　　查看ASBR路由表

    

    

    

    

2. 　　查看ASBR mpls lsp

    

    

    

    

2. PE配置VPN端口接入CE

1. 　　PE1

   ip vpn-instance vpn1
   ipv4-family
   route-distinguisher 100:1
   vpn-target 100:1 export-extcommunity
   vpn-target 100:1 import-extcommunity

   interface GigabitEthernet0/0/1
   ip binding vpn-instance vpn1
   ip address 10.0.0.2 255.255.255.252

   bgp 100
   #
   ipv4-family unicast
   undo synchronization
   #
   ipv4-family vpn-instance vpn1 
   peer 10.0.0.1 as-number 300
   
   CE1

   bgp 300
   peer 10.0.0.2 as-number 100
   #
   ipv4-family unicast
   undo synchronization
   network 192.168.0.1 255.255.255.255
   peer 10.0.0.2 enable
   #

2. PE2
   

   ip vpn-instance vpn1
   ipv4-family
   route-distinguisher 100:1
   vpn-target 100:1 export-extcommunity
   vpn-target 100:1 import-extcommunity
   
   
   

   interface GigabitEthernet0/0/1
   ip binding vpn-instance vpn1
   ip address 10.10.10.2 255.255.255.252
   
   
   

   bgp 200
   #
   ipv4-family unicast
   undo synchronization
   #
   ipv4-family vpn-instance vpn1 
   peer 10.10.10.1 as-number 400

3. 查看BGP状态与路由
   

1. 　　PE1
   

    

    

    

    

    

2. PE2
   

    

    

   

    

    

   
   
   

4. PE与ASBR间建立IBGP-VPNV4邻居关系，传递私网路由，注意ASBR一定要undo policy vpn-target，否则会因为VPN RT值不匹配导致无法安装私网路由
   

   ASBR
   bgp 100
   peer 1.1.1.1 as-number 100 
   peer 1.1.1.1 connect-interface LoopBack0
   #
   ipv4-family unicast
   undo synchronization
   peer 1.1.1.1 enable
   peer 34.1.1.4 enable
   # 
   ipv4-family vpnv4
   undo policy vpn-target
   peer 1.1.1.1 enable

   PE
   

   bgp 100
   peer 3.3.3.3 as-number 100 
   peer 3.3.3.3 connect-interface LoopBack0
   #
   ipv4-family unicast
   undo synchronization
   peer 3.3.3.3 enable
   # 
   ipv4-family vpnv4
   policy vpn-target
   peer 3.3.3.3 enable
   查看ASBR是否正常接收到PE传递的私网路由

   

    

    

   
   
   

5. ASBR间建立EBGP-VPNV4邻居关系，并配置替换外层VPN标签，使公网LSP完整
   ASBR1
   

   bgp 100
   peer 1.1.1.1 as-number 100 
   peer 1.1.1.1 connect-interface LoopBack0
   peer 34.1.1.4 as-number 200 
   #
   ipv4-family unicast
   undo synchronization
   peer 1.1.1.1 enable
   peer 1.1.1.1 route-policy to-pe export
   peer 1.1.1.1 label-route-capability
   peer 34.1.1.4 enable
   peer 34.1.1.4 route-policy to-asbr export
   peer 34.1.1.4 label-route-capability
   # 
   ipv4-family vpnv4
   undo policy vpn-target
   peer 1.1.1.1 enable
   peer 34.1.1.4 enable
   
   
   

   route-policy to-asbr permit node 10 
   apply mpls-label
   #
   route-policy to-pe permit node 10 
   if-match mpls-label 
   apply mpls-label
   
   ASBR2
   
   

   bgp 200
   peer 6.6.6.6 as-number 200 
   peer 6.6.6.6 connect-interface LoopBack0
   peer 34.1.1.3 as-number 100 
   #
   ipv4-family unicast
   undo synchronization
   peer 6.6.6.6 enable
   peer 6.6.6.6 route-policy to-pe export
   peer 6.6.6.6 label-route-capability
   peer 34.1.1.3 enable
   peer 34.1.1.3 route-policy to-asbr export
   peer 34.1.1.3 label-route-capability
   # 
   ipv4-family vpnv4
   undo policy vpn-target
   peer 6.6.6.6 enable
   peer 34.1.1.3 enable
   
   
   

   route-policy to-asbr permit node 10 
   apply mpls-label
   #
   route-policy to-pe permit node 10 
   if-match mpls-label 
   apply mpls-label
   
   查看两端ASBR路由
   

    

    

    

    

    查看两端ASBR MPLS LSP
   

    

    

    

    

    

6. 查看CE设备路由表，并测试连通性　　
   

    

    

    

    

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