多宿主MPLSVPN中-应用AS-override注意的问题VIP免费

多宿主MPLS/VPN中，应用AS-override注意的问题由admin于星期二,04/01/2008-16:25发表目的研究PE与CE间使用BGP时，可能出现的次优路径及其环路拓扑图在下面当PE与CE之间使用BGP时，在多宿主网络中，使用AS-override有可能形成次优路径或环路，如上图所示。配置如下R1ipvrfvpn-ard1:10route-targetexport1:10route-targetimport1:10!ipcef!interfaceLoopback0ipaddress1.1.1.1255.255.255.255!interfaceFastEthernet0/0noipaddressinterfaceFastEthernet0/0.12encapsulationdot1Q12ipaddress12.1.1.1255.255.255.0tag-switchingip!interfaceFastEthernet0/0.13encapsulationdot1Q13ipaddress13.1.1.1255.255.255.0tag-switchingip!interfaceFastEthernet0/0.14encapsulationdot1Q14ipvrfforwardingvpn-aipaddress14.1.1.1255.255.255.0routerospf10log-adjacency-changesnetwork0.0.0.0255.255.255.255area0!routerbgp1nosynchronizationbgplog-neighbor-changesneighbor2.2.2.2remote-as1neighbor2.2.2.2update-sourceLoopback0neighbor3.3.3.3remote-as1neighbor3.3.3.3update-sourceLoopback0noauto-summary!address-familyvpnv4neighbor2.2.2.2activateneighbor2.2.2.2send-communityextendedneighbor3.3.3.3activateneighbor3.3.3.3send-communityextendedexit-address-family!address-familyipv4vrfvpn-aneighbor14.1.1.4remote-as2neighbor14.1.1.4activateneighbor14.1.1.4as-overridenoauto-summarynosynchronizationexit-address-familyR2ipvrfvpn-ard1:10route-targetexport1:10route-targetimport1:10!ipcef!interfaceLoopback0ipaddress2.2.2.2255.255.255.255!interfaceFastEthernet0/0noipaddress!interfaceFastEthernet0/0.12encapsulationdot1Q12ipaddress12.1.1.2255.255.255.0tag-switchingip!interfaceFastEthernet0/0.23encapsulationdot1Q23ipaddress23.1.1.2255.255.255.0tag-switchingip!interfaceFastEthernet0/0.25encapsulationdot1Q25ipvrfforwardingvpn-aipaddress25.1.1.2255.255.255.0routerospf10log-adjacency-changesnetwork0.0.0.0255.255.255.255area0!routerbgp1nosynchronizationbgplog-neighbor-changesneighbor1.1.1.1remote-as1neighbor1.1.1.1update-sourceLoopback0neighbor3.3.3.3remote-as1neighbor3.3.3.3update-sourceLoopback0noauto-summary!address-familyvpnv4neighbor1.1.1.1activateneighbor1.1.1.1send-communityextendedneighbor3.3.3.3activateneighbor3.3.3.3send-communityextendedexit-address-family!address-familyipv4vrfvpn-aneighbor25.1.1.5remote-as2neighbor25.1.1.5activateneighbor25.1.1.5as-overridenoauto-summarynosynchronizationexit-address-familyR3ipvrfvpn-ard1:10route-targetexport1:10route-targetimport1:10!ipcefinterfaceLoopback0ipaddress3.3.3.3255.255.255.255!interfaceFastEthernet0/0noipaddressduplexhalf!interfaceFastEthernet0/0.13encapsulationdot1Q13ipaddress13.1.1.3255.255.255.0tag-switchingip!interfaceFastEthernet0/0.23encapsulationdot1Q23ipaddress23.1.1.3255.255.255.0tag-switchingip!interfaceFastEthernet0/0.36encapsulationdot1Q36ipvrfforwardingvpn-aipaddress36.1.1.3255.255.255.0routerospf10log-adjacency-changesnetwork0.0.0.0255.255.255.255area0!routerbgp1nosynchronizationbgplog-neighbor-changesneighbor1.1.1.1remote-as1neighbor1.1.1.1update-sourceLoopback0neighbor2.2.2.2remote-as1neighbor2.2.2.2update-sourceLoopback0noauto-summary!address-familyvpnv4neighbor1.1.1.1activateneighbor1.1.1.1send-communityextendedneighbor2.2.2.2activateneighbor2.2.2.2send-communityextendedexit-address-family!address-familyipv4vrfvpn-aneighbor36.1.1.6remote-as2neighbor36.1.1.6activateneighbor36.1.1.6as-overridenoauto-summarynosynchronizationexit-address-familyR4interfaceLoopback0ipaddress4.4.4.4255.255.255.255!inter...