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.
About this task
By default, a BGP4 device does not originate and advertise the default BGP4 route.
You can configure a BGP4 device to advertise the default IPv4 route to all BGP4
neighbors and to install that route in the local BGP4 route table.
Before you begin
The default route must be present in the
local IPv4 route table.
Procedure
-
Access global configuration
mode.
device# configure terminal
-
Access BGP configuration mode.
device(config)# router bgp
-
Access IPv4 address family
unicast configuration mode.
device(config-bgp-router)# address-family ipv4 unicast
-
Configure the device to
originate and advertise the default BGP route and to install that route in the
local BGP4 route table.
device(config-bgp-ipv4u)# default-information-originate
Example
This example summarizes the commands in this procedure.
device# configure terminal
device(config)# router bgp
device(config-bgp-router)# address-family ipv4 unicast
device(config-bgp-ipv4u)# default-information-originate
