| 该 如何配置MPLS核心网络里面的P路由器？ 步骤： Router-P1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router-P1(config)#ip cef Router-P1(config)#mpls ip Router-P1(config)#interface FastEthernet0/0 Router-P1(config-if)#description connection to Router-PE2 Router-P1(config-if)#ip address 10.1.2.11 255.255.255.0 Router-P1(config-if)#mpls ip Router-P1(config-if)#exit Router-P1(config)#interface Serial0/0 Router-P1(config-if)#description connection to Router-PE1 Router-P1(config-if)#ip address 10.1.1.14 255.255.255.252 Router-P1(config-if)#mpls ip Router-P1(config-if)#exit Router-P1(config)#interface Serial0/1 Router-P1(config-if)#description connection to Router-PE3 Router-P1(config-if)#ip address 10.1.1.10 255.255.255.252 Router-P1(config-if)#mpls ip Router-P1(config-if)#exit Router-P1(config)#interface Loopback0 Router-P1(config-if)#ip address 10.0.0.11 255.255.255.255 Router-P1(config-if)#exit Router-P1(config)#router ospf 99 Router-P1(config-router)#router-id 10.0.0.11 Router-P1(config-router)#network 10.0.0.0 0.255.255.255 area 0 Router-P1(config-router)#exit Router-P1(config)#end Router-P1# 注释 对于P路由器就是启用CEF和在端口启用MPLS，对于tag-switching ip instead 和mpls ip两个命令都基本一致，对于是否配置ldp或者tdp也不是必要的，路由器会自动适应。有三个验证命令： Router-P1#show mpls interfaces Interface IP Tunnel Operational FastEthernet0/0 Yes (tdp) No Yes Serial0/0 Yes (tdp) No Yes Serial0/1 Yes (tdp) No Yes Router-P1#show mpls ldp neighbor Peer TDP Ident: 10.0.0.2:0; Local TDP Ident 10.0.0.11:0 TCP connection: 10.0.0.2.711 - 10.0.0.11.28185 State: Oper; PIEs sent/rcvd: 0/82; Downstream Up time: 01:04:45 TDP discovery sources: Serial0/0, Src IP addr: 10.1.1.13 Addresses bound to peer TDP Ident: 10.0.0.2 10.1.1.2 10.1.1.13 Router-P1#show mpls forwarding-table Local Outgoing Prefix Bytes tag Outgoing Next Hop tag tag or VC or Tunnel Id switched interface 16 Pop tag 10.0.0.2/32 7697 Se0/0 point2point 17 Pop tag 10.1.1.0/30 0 Se0/0 point2point 18 Pop tag 10.0.0.3/32 6685 Se0/1 point2point 配置基本的MPLS PE路由器 提问 配置MPLS网络的运营商边界路由器来互联用户网络 回答 配置三台PE路由器 Router-PE1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router-PE1(config)#ip cef Router-PE1(config)#mpls ip Router-PE1(config)#interface Serial0/0 Router-PE1(config-if)#description Connection to Router-P1 Router-PE1(config-if)#ip address 10.1.1.13 255.255.255.252 Router-PE1(config-if)#mpls ip Router-PE1(config-if)#exit Router-PE1(config)#interface Loopback0 Router-PE1(config-if)#ip address 10.0.0.2 255.255.255.255 Router-PE1(config-if)#exit Router-PE1(config)#router ospf 99 Router-PE1(config-router)#router-id 10.0.0.2 Router-PE1(config-router)#network 10.0.0.0 0.255.255.255 area 0 Router-PE1(config-router)#exit Router-PE1(config)#ip vrf NetworkA Router-PE1(config-vrf)#rd 100:1 Router-PE1(config-vrf)#route-target export 100:1 Router-PE1(config-vrf)#route-target import 100:1 Router-PE1(config-vrf)#exit Router-PE1(config)#ip vrf NetworkB Router-PE1(config-vrf)#rd 100:2 Router-PE1(config-vrf)#route-target export 100:2 Router-PE1(config-vrf)#route-target import 100:2 Router-PE1(config-vrf)#exit Router-PE1(config)#interface Ethernet0/0 Router-PE1(config-if)#description connection to customer A, site 1 Router-PE1(config-if)#ip vrf forwarding NetworkA Router-PE1(config-if)#ip address 192.168.1.1 255.255.255.0 Router-PE1(config-if)#exit Router-PE1(config)#interface Ethernet0/1 Router-PE1(config-if)#description connection to customer B, site 1 Router-PE1(config-if)#ip vrf forwarding NetworkB Router-PE1(config-if)#ip address 192.168.11.1 255.255.255.0 Router-PE1(config-if)#exit Router-PE1(config)#router bgp 100 Router-PE1(config-router)#bgp log-neighbor-changes Router-PE1(config-router)#neighbor 10.0.0.3 remote-as 100 Router-PE1(config-router)#neighbor 10.0.0.3 update-source Loopback0 Router-PE1(config-router)#neighbor 10.0.0.4 remote-as 100 Router-PE1(config-router)#neighbor 10.0.0.4 update-source Loopback0 Router-PE1(config-router)#address-family ipv4 vrf NetworkA Router-PE1(config-router-af)#no auto-summary Router-PE1(config-router-af)#no synchronization Router-PE1(config-router-af)#redistribute connected Router-PE1(config-router-af)#exit-address-family Router-PE1(config-router)#adress-family ipv4 vrf NetworkB Router-PE1(config-router-af)#no auto-summary Router-PE1(config-router-af)#no synchronization Router-PE1(config-router-af)#redistribute connected Router-PE1(config-router-af)#exit-address-family Router-PE1(config-router)#address-family vpnv4 Router-PE1(config-router-af)#neighbor 10.0.0.3 activate Router-PE1(config-router-af)#neighbor 10.0.0.3 send-community extended Router-PE1(config-router-af)#neighbor 10.0.0.4 activate Router-PE1(config-router-af)#neighbor 10.0.0.4 send-community extended Router-PE1(config-router-af)#exit-address-family Router-PE1(config-router)#exit Router-PE1(config)#end Router-PE1# Router-PE2#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router-PE2(config)#ip cef Router-PE2(config)#mpls ip Router-PE2(config)#interface FastEthernet0/0 Router-PE2(config-if)#no ip address Router-PE2(config-if)#exit Router-PE2(config)#interface FastEthernet0/0.1 Router-PE2(config-if)#description Connection to Router-P1 Router-PE2(config-if)#encapsulation dot1Q 10 Router-PE2(config-if)#ip address 10.1.2.4 255.255.255.0 Router-PE2(config-if)#mpls ip Router-PE2(config-if)#exit Router-PE2(config)#interface Loopback0 Router-PE2(config-if)#ip address 10.0.0.3 255.255.255.255 Router-PE2(config-if)#exit Router-PE2(config)#router ospf 99 Router-PE2(config-router)#router-id 10.0.0.3 Router-PE2(config-router)#network 10.0.0.0 0.255.255.255 area 0 Router-PE2(config-router)#exit Router-PE2(config)#ip vrf NetworkA Router-PE2(config-vrf)#rd 100:1 Router-PE2(config-vrf)#route-target export 100:1 Router-PE2(config-vrf)#route-target import 100:1 Router-PE2(config-vrf)#exit Router-PE2(config)#ip vrf NetworkB Router-PE2(config-vrf)#rd 100:2 Router-PE2(config-vrf)#route-target export 100:2 Router-PE2(config-vrf)#route-target import 100:2 Router-PE2(config-vrf)#exit Router-PE2(config)#interface FastEthernet0/0.2 Router-PE2(config-if)#description Connection to customer A, site 2 Router-PE2(config-if)#encapsulation dot1Q 102 Router-PE2(config-if)#ip address 192.168.3.1 255.255.255.0 Router-PE2(config-if)#mpls ip Router-PE2(config-if)#exit Router-PE2(config)#router bgp 100 Router-PE2(config-router)#bgp log-neighbor-changes Router-PE2(config-router)#neighbor 10.0.0.2 remote-as 100 Router-PE2(config-router)#neighbor 10.0.0.2 update-source Loopback0 Router-PE2(config-router)#neighbor 10.0.0.3 remote-as 100 Router-PE2(config-router)#neighbor 10.0.0.3 update-source Loopback0 Router-PE2(config-router)#address-family ipv4 vrf NetworkA Router-PE2(config-router-af)#no auto-summary Router-PE2(config-router-af)#no synchronization Router-PE2(config-router-af)#redistribute connected Router-PE2(config-router-af)#exit-address-family Router-PE2(config-router)#address-family vpnv4 Router-PE2(config-router-af)#neighbor 10.0.0.2 activate Router-PE2(config-router-af)#neighbor 10.0.0.2 send-community extended Router-PE2(config-router-af)#neighbor 10.0.0.4 activate Router-PE2(config-router-af)#neighbor 10.0.0.4 send-community extended Router-PE2(config-router-af)#exit-address-family Router-PE2(config-router)#exit Router-PE2(config)#end Router-PE2# Router-PE3#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router-PE3(config)#ip cef Router-PE3(config)#mpls ip Router-PE3(config)#interface Serial0/0 Router-PE3(config-if)#description Connection to Router-P1 Router-PE3(config-if)#ip address 10.1.1.9 255.255.255.252 Router-PE3(config-if)#mpls ip Router-PE3(config-if)#exit Router-PE3(config)#interface Loopback0 Router-PE3(config-if)#ip address 10.0.0.3 255.255.255.255 Router-PE3(config-if)#exit Router-PE3(config)#router ospf 99 Router-PE3(config-router)#router-id 10.0.0.3 Router-PE3(config-router)#network 10.0.0.0 0.255.255.255 area 0 Router-PE3(config-router)#exit Router-PE3(config)#ip vrf NetworkA Router-PE3(config-vrf)#rd 100:1 Router-PE3(config-vrf)#route-target export 100:1 Router-PE3(config-vrf)#route-target import 100:1 Router-PE3(config-vrf)#exit Router-PE3(config)#ip vrf NetworkB Router-PE3(config-vrf)#rd 100:2 Router-PE3(config-vrf)#route-target export 100:2 Router-PE3(config-vrf)#route-target import 100:2 Router-PE3(config-vrf)#exit Router-PE3(config)#interface Ethernet0/0 Router-PE3(config-if)#description connection to customer A, site 3 Router-PE3(config-if)#ip vrf forwarding NetworkA Router-PE3(config-if)#ip address 192.168.2.1 255.255.255.0 Router-PE3(config-if)#exit Router-PE3(config)#interface Ethernet0/1 Router-PE3(config-if)#description connection to customer B, site 2 Router-PE3(config-if)#ip vrf forwarding NetworkB Router-PE3(config-if)#ip address 192.168.10.1 255.255.255.0 Router-PE3(config-if)#exit Router-PE3(config)#router bgp 100 Router-PE3(config-router)#bgp log-neighbor-changes Router-PE3(config-router)#neighbor 10.0.0.2 remote-as 100 Router-PE3(config-router)#neighbor 10.0.0.2 update-source Loopback0 Router-PE3(config-router)#neighbor 10.0.0.4 remote-as 100 Router-PE3(config-router)#neighbor 10.0.0.4 update-source Loopback0 Router-PE3(config-router)#address-family ipv4 vrf NetworkA Router-PE3(config-router-af)#no auto-summary Router-PE3(config-router-af)#no synchronization Router-PE3(config-router-af)#redistribute connected Router-PE3(config-router-af)#exit-address-family Router-PE3(config-router)#adress-family ipv4 vrf NetworkB Router-PE3(config-router-af)#no auto-summary Router-PE3(config-router-af)#no synchronization Router-PE3(config-router-af)#redistribute connected Router-PE3(config-router-af)#exit-address-family Router-PE3(config-router)#address-family vpnv4 Router-PE3(config-router-af)#neighbor 10.0.0.2 activate Router-PE3(config-router-af)#neighbor 10.0.0.2 send-community extended Router-PE3(config-router-af)#neighbor 10.0.0.4 activate Router-PE3(config-router-af)#neighbor 10.0.0.4 send-community extended Router-PE3(config-router-af)#exit-address-family Router-PE3(config-router)#exit Router-PE3(config)#end Router-PE3# 注释 对于PE路由器首先是类似P路由器的基本MPLS配置，然后是配置了两个客户网络的VRF，其中rd用来作为MP BGP发布此VRF路由的标签，route target用来告诉MP BGP那个rd与之共享路由。在关联接口和VRF的时候要先配置ip vrf forwarding命令然后配置IP地址，通过show ip vrf来验证。然后就是MP-BGP的配置，这里和平常BGP配置最大的不同就是必须有send-community extended的配置，因为VRF的信息是通过这个值来宣告的，两个验证命令show ip route vrf NetworkA和ping vrf NetworkA 192.168.2.9 source 192.168.1.1 后略，详见 ：http://www.net130.com/CMS/Pub/Tech/tech_zh/2007_04_09_13769_2.htm |
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