Advertising the default BGP4 route

By default, a BGP device does not originate and advertise a default route using BGP4. A BGP4 default route is the IP address 0.0.0.0 and the route prefix 0 or network mask 0.0.0.0. For example, 0.0.0.0/0 is a default route. A BGP device can be configured to advertise the default IPv4 route to all BGP4 neighbors and to install that route in the local BGP4 route table.
The default route must be present in the local IPv4 route table.
  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 default-information-originate command to advertise the default IPv4 route to all BGP4 neighbors and to install that route in the local BGP4 route table. 
    device(config-bgp-router)# default-information-originate

The following example enables a BGP4 device to advertise the default IPv4 route to all BGP4 neighbors and to install that route in the local BGP4 route table. 

device# configure terminal
device(config)# router bgp
device(config-bgp-router)# default-information-originate
Parent topic: BGP4