[David.C]

Preview Qmap: "BGP Default-route.qmap"


According to the topology above, configure R6 to conditionally advertise a default route to BGP neighbors when it has route to 11.11.36.0/30.

[David.C]

In this case, you can conditionally advertise a default-route by using the advertise-map, exist-map, non-exist map.



neighbor 11.11.67.7 advertise-map adv_default exist-map to_R3

• advertise-map Specifies the BGP route that will be advertised if the conditions of the exist map or non-exist map are met.

• exist-map Specifies the conditional routes that need to be in local route table in order for BGP to advertise the routes defined in advertise-map.

• non-exist-map Specifies the conditional routes that must not be in local route table before BGP starts to advertise routes defined in advertise-map

Verify via:

R1#show ip route bgp
11.0.0.0/8 is variably subnetted, 5 subnets, 2 masks
B 11.11.6.0/24 [20/0] via 11.11.17.7, 00:09:30
B 11.11.7.0/24 [20/0] via 11.11.17.7, 00:09:31
B* 0.0.0.0/0 [20/0] via 11.11.17.7, 00:08:22