By default, a device advertises
individual routes for all networks. To minimize the size of the routing table, you can
aggregate the routes in a range of networks into one IPv6 prefix.
About this task
You can aggregate BGP4+ routes into one
network prefix, for example, 2001:db8::/24. This single prefix is advertised to BGP4+
neighbors instead of the individual BGP routes in the routing table that are within the
specified range.
Procedure
-
Access global configuration
mode.
device# configure terminal
-
Access BGP configuration mode.
device(config)# router bgp
-
Access IPv6 address family
configuration mode.
device(config-bgp-router)# address-family ipv6 unicast
-
Specify the network prefix into
which routes are to be aggregated.
device(config-bgp-ipv6u)# aggregate-address 2001:db8::/32
Example
The following example summarizes the commands in
this procedure.
device# configure terminal
device(config)# router bgp
device(config-bgp-router)# address-family ipv6 unicast
device(config-bgp-ipv6u)# aggregate-address 2001:db8::/32
