Administrator Guide

aggregate—address address-mask
Use the aggregate-address command without any keywords to create an aggregate entry if any specic BGP routes are available
in the specied range.
Example of conguring aggregate routes using BGP
DellEMC# configure terminal
DellEMC(conf)# router bgp 100
DellEMC(conf-router_bgp)# aggregate-address 10.1.1.0/24
DellEMC(conf-router_bgp)# exit
DellEMC(conf)#
Following is the sample output of show ip bgp command.
DellEMC# show ip bgp
BGP local RIB : Routes to be Added 0, Replaced 0, Withdrawn 0
BGP local router ID is 30.30.30.30
Status codes: s suppressed, S stale, d dampened, h history, * valid, > best
Path source: I - internal, a - aggregate, c - confed-external, r - redistributed
n - network, D - denied, S - stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>r 3.3.3.0/24 0.0.0.0 0 32768 ?
s>r 10.1.1.0/30 0.0.0.0 0 32768 ?
*>r 30.30.30.30/32 0.0.0.0 0 32768 ?
*>a 10.1.1.0/24 0.0.0.0 32768 ?
Suppressing BGP aggregate routes
The routes that are suppressed are not advertised to any of the BGP neighbors. You can suppress the aggregate routes using the
suppress-map or summary-only options in the aggregate-address conguration. To suppress the advertisement of the
aggregate routes using BGP, use the following commands.
• Create an aggregate entry and suppress the advertisement of specic routes to all neighbors.
CONFIG-ROUTER-BGP mode
aggregate—address address-mask summary-only
• Create an aggregate entry and suppress the advertisement of specic routes.
CONFIG-ROUTER-BGP mode
aggregate—address address-mask suppress-map map-name
The suppress-map keyword creates the aggregate route but suppress the advertisement of specied routes. The routes that are
suppressed are not advertised to the neighbors. You can use
match clause of route maps to selectively suppress the specic route
from the aggregate routes.
Example of suppressing aggregate routes using BGP
Following is the sample conguration to suppress the advertisement of specic aggregate routes.
DellEMC# configure terminal
DellEMC(conf)# router bgp 100
DellEMC(conf-router_bgp)# aggregate-address 10.1.1.0/24 suppress-map map1
DellEMC(conf-router_bgp)# exit
DellEMC(conf)#
The route-map named map1 can have any action such as permit and sequence number congured, so that the advertisement of
aggregate routes can be suppressed based on the set action in the route-map.
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Border Gateway Protocol (BGP)