Configuring BGP4+ Peers

Procedure

• Configure an IBGP peer.
  1. Access the system view.

     system-view

  2. Access the BGP view.

     bgp { as-number-plain | as-number-dot }

  3. Set the IP address and the number of the AS where a BGP peer resides.

     peer ipv4-address as-number { as-number-plain | as-number-dot }

     The number of the AS where the specified peer resides should be the same as the number of the local AS.

  4. (Optional) Set the source interface and source address used to set up a TCP connection.

     peer ipv6-address connect-interface interface-type interface-number [ ipv6-source-address ]

     Usually, BGP4+ uses the physical interface that is directly connected to the peer as the session interface used for the TCP connection.

     To increase the reliability and stability of the BGP4+ connections, configure the local interface used for the BGP4+ connection as the loopback interface. In this way, when there are redundant links on the network, the BGP4+ connections are not interrupted due to the failure of a certain interface or a link.

  5. (Optional) Configure a peer only to listen to connection requests, but not to send connection requests.

     peer ipv6-address listen-only

     After this command is used, the existing peer relationship is interrupted. The peer on which this command is used waits for the connection request from its peer to reestablish the neighbor relationship. This configuration can prevent the conflict of sending connection requests.

     

     This command can be used on only one of two peers. If this command is used on the two peers, the connection between the two peers cannot be established.

  6. Access the BGP IPv6 unicast address family view.

     ipv6-family [ unicast ]

  7. Enable an IPv6 peer.

     peer ipv6-address enable

     After configuring the BGP4+ peers in the BGP view, you need to enable these peers in the BGP IPv6 unicast address family view.

• Configure an EBGP peer.
  1. Access the system view.

     system-view

  2. Access the BGP view.

     bgp { as-number-plain | as-number-dot }

  3. Set the IP address and the number of the AS where a BGP peer resides.

     peer ipv4-address as-number { as-number-plain | as-number-dot }

     The number of the AS where the specified peer resides should be the same as the number of the local AS.

  4. (Optional) Set the source interface and source address used to set up a TCP connection.

     peer ipv6-address connect-interface interface-type interface-number [ ipv6-source-address ]

     Usually, BGP4+ uses the physical interface that is directly connected to the peer as the session interface used for the TCP connection.

     To increase the reliability and stability of the BGP4+ connections, configure the local interface used for the BGP4+ connection as the loopback interface. In this way, when there are redundant links on the network, the BGP4+ connections are not interrupted due to the failure of a certain interface or a link.

  5. (Optional) Set the maximum number of hops in the EBGP connections.

     peer ipv6-address ebgp-max-hop [ number ]

     By default, a direct physical link must be available between EBGP peers. If such a link does not exist, run the peer ebgp-max-hop command to allow EBGP peers to establish a TCP connection over multiple hops.

     If hop-count is not specified in the peer ebgp-max-hop command, 255 is used as the maximum number of hops in EBGP connections.

     

     If loopback interfaces are used to establish an EBGP peer relationship, the peer ebgp-max-hop command (hop-count ≥ 2) must be run. Otherwise, the peer relationship cannot be established.

  6. (Optional) Configure a peer only to listen to connection requests, but not to send connection requests.

     peer ipv6-address listen-only

     After this command is used, the existing peer relationship is interrupted. The peer on which this command is used waits for the connection request from its peer to reestablish the neighbor relationship. This configuration can prevent the conflict of sending connection requests.

     

     This command can be used on only one of two peers. If this command is used on the two peers, the connection between the two peers cannot be established.

  7. Access the BGP IPv6 unicast address family view.

     ipv6-family [ unicast ]

  8. Enable the IPv6 peer.

     peer ipv6-address enable

     After configuring the BGP4+ peers in the BGP view, you need to enable these peers in the BGP IPv6 unicast address family view.