Using the IPv6 default route as a valid next hop for a BGP4+ route

In certain cases, such as when a device is acting as an edge device, it can be configured to use the default route as a valid next hop.

By default, a device does not use a default route to resolve a BGP4+ next-hop route. If the IPv6 route lookup for the BGP4+ next-hop does not result in a valid IGP route (including static or direct routes), the BGP4+ next-hop is considered to be unreachable and the BGP4+ route is not used. You can configure the device to use the default route as a valid next hop.
  1. Enter the configure terminal command to access global configuration mode. 
    device# configure terminal
  2. Enter the router bgp command to enable BGP routing. 
    device(config)# router bgp
  3. Enter the address-family command and specify the ipv6 and unicast keywords to enter IPv6 address family configuration mode. 
    device(config-bgp-router)# address-family ipv6 unicast
  4. Enter the next-hop-enable-default command to configure the device to use the default route as a valid next hop. 
    device(config-bgp-ipv6u)# next-hop-enable-default

The following example configures a BGP4+ device to use the default route as a valid next hop. 

device# configure terminal
device(config)# router bgp
device(config-bgp-router)# address-family ipv6 unicast
device(config-bgp-ipv6u)# next-hop-enable-default
Parent topic: BGP4+