11-27[SwitchB-bgp] ipv6-family[SwitchB-bgp-af-ipv6] peer 100::1 as-number 100[SwitchB-bgp-af-ipv6] peer 101::1 as-number 200[SwitchB-bgp-af-ipv6] peer 101::1 next-hop-local# Configure Switch C. system-view[SwitchC] ipv6[SwitchC] bgp 200[SwitchC-bgp] router-id 3.3.3.3[SwitchC-bgp] ipv6-family[SwitchC-bgp-af-ipv6] peer 101::2 as-number 200[SwitchC-bgp-af-ipv6] peer 102::2 as-number 200# Configure Switch D. system-view[SwitchD] ipv6[SwitchD] bgp 200[SwitchD-bgp] router-id 4.4.4.4[SwitchD-bgp] ipv6-family[SwitchD-bgp-af-ipv6] peer 102::1 as-number 2003) Configure route reflector# Configure Switch C as a route reflector, Switch B and Switch D as its clients.[SwitchC-bgp-af-ipv6] peer 101::2 reflect-client[SwitchC-bgp-af-ipv6] peer 102::2 reflect-clientUse the display bgp ipv6 routing-table command on Switch B and Switch D respectively, you canfind both of them have learned the network 1::/64.Troubleshooting IPv6 BGP ConfigurationNo IPv6 BGP Peer Relationship EstablishedSymptomDisplay BGP peer information using the display bgp ipv6 peer command. The state of the connectionto the peer cannot become established.AnalysisTo become IPv6 BGP peers, any two routers need to establish a TCP session using port 179 andexchange open messages successfully.Processing steps1) Use the display current-configuration command to verify the peer’s AS number.2) Use the display bgp ipv6 peer command to verify the peer’s IPv6 address.3) If the loopback interface is used, check whether the peer connect-interface command isconfigured.4) If the peer is not directly connected, check whether the peer ebgp-max-hop command isconfigured.5) Check whether a route to the peer is available in the routing table.6) Use the ping command to check connectivity.7) Use the display tcp ipv6 status command to check the TCP connection.
