Multi-protocol Internal BGP

This section details a few considerations specific to the L3 VPN configuration.

BGP is configured on the global VRF. Configure BGP for your network as you would if you were not configuring L3 VPN.

The VPN address family for the IP type you are using must be enabled. Enter the VPN address family mode for the IP type you are using on the VPN using the address-family vpnv4 or address-family vpnv6 command. In the appropriate VPN address family configuration mode, use the enable command to enable the address family.

BGP peers within either the IPv4 or IPv6 L3 VPN address family must be administratively activated using the neighbor activate command.

BGP routes associated with the neighbor must be redistributed to the CE router on the VRF that will use the L3 VPN. To redistribute routes learned from the PE router neighbor for this VRF, enter the BGP global configuration address family using the address-family ipv4 vrf command or the address-family ipv6 vrf command. Once in the BGP global configuration address family mode, use the appropriate redistribute command for the routes to be redistributed to the CE router.

This example shows how to:

• Configure BGP neighbor 100.10.10.5 and set the neighbor source to the BGP router ID
• Enter the L3 VPN IPv4 address family
• Enable the L3 VPN IPv4 address family
• Activate the peer for the IPv4 L3 VPN address family
• Enter the BGP global configuration IPv6 address family for the vr1 VRF
• Redistribute the IPv4 static routes for VRF vr1

  System(rw)->
  System(su-config)->router bgp 65151
  System(su-config-bgp)->bgp router-id 100.10.10.1
  System(su-config-bgp)->neighbor 100.10.10.5 remote-as 65151
  System(su-config-bgp)->neighbor 100.10.10.5 update-source 100.10.10.1
  System(su-config-bgp)->address-family vpnv4
  System(su-config-bgp-af-vpn)->enable
  System(su-config-bgp-af-vpn)->100.10.10.5 neighbor activate
  System(su-config-bgp-af-vpn)->exit
  System(su-config-bgp)->address-family ipv4 vrf vr1
  System(su-config-bgp-af-vrf)->redistribute static
  System(su-config-bgp-af-vrf)->exit
  System(su-config-bgp)->exit
  System(rw-config)->