Reference Guide

Border Gateway Protocol IPv4 (BGPv4) | 397
aggregate-address
c e
t
s
Summarize a range of prefixes to minimize the number of entries in the routing table.
Syntax
aggregate-address ip-address mask [advertise-map map-name] [as-set] [attribute-map
map-name] [summary-only] [suppress-map map-name]
Parameters
Defaults
Not configured.
Command Modes
ROUTER BGP Address Family (conf-router_bgp_af)
Usage
Information
At least one of the routes included in the aggregate address must be in the BGP
routing table for the configured aggregate to become active.
Do not add the
as-set parameter to the aggregate. If routes within the aggregate are
constantly changing, the aggregate will flap to keep track of the changes in the
AS_PATH.
In route maps used in the
suppress-map parameter, routes meeting the deny clause are
not suppress; in other words, they are allowed. The opposite is true: routes meeting
the
permit clause are suppressed.
If the route is injected via the network command, that route will still appear in the
routing table if the summary-only parameter is configured in the aggregate-address
command.
The summary-only parameter suppresses all advertisements. If you want to suppress
advertisements to only specific neighbors, use the neighbor distribute-list command.
ip-address mask
Enter the IP address and mask of the route to be the aggregate
address. Enter the IP address in dotted decimal format (A.B.C.D)
and mask in /prefix format (/x).
advertise-map map-name (OPTIONAL) Enter the keywords advertise-map followed by the
name of a configured route map to set filters for advertising an
aggregate route.
as-set
(OPTIONAL) Enter the keyword as-set to generate path attribute
information and include it in the aggregate.
AS_SET includes AS_PATH and community information from the
routes included in the aggregated route.
attribute-map map-name (OPTIONAL) Enter the keywords attribute-map followed by the
name of a configured route map to modify attributes of the
aggregate, excluding AS_PATH and NEXT_HOP attributes.
summary-only (OPTIONAL) Enter the keyword summary-only to advertise only
the aggregate address. Specific routes will not be advertised.
suppress-map map-name (OPTIONAL) Enter the keywords suppress-map followed by the
name of a configured route map to identify which more-specific
routes in the aggregate are suppressed.