Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 429)

Aggregating routes advertised to BGP4 neighbors
By default, the device advertises individual routes for all networks. The aggregation feature allows you
to configure the device to aggregate routes from a range of networks into a single network prefix. For
example, without aggregation, the device will individually advertise routes for networks 10.95.1.0/24,
10.95.2.0/24, and 10.95.3.0/24. You can configure the device to end a single, aggregate route for the
networks instead. The aggregate route can be advertised as 10.95.0.0/16.
To aggregate routes for 10.157.22.0/24, 10.157.23.0/24, and 10.157.24.0/24, enter the following
command.
device(config-bgp)# aggregate-address 10.157.0.0 255.255.0.0
Syntax: [no] aggregate-address ip-addr ip-mask [ as-set ] [ summary-only ] [ suppress-map map-
name ] [ advertise-map map-name ] [ attribute-map map-name ]
The ip-addr and ip-mask parameters specify the aggregate value for the networks. Specify 0 for the
host portion and for the network portion that differs among the networks in the aggregate. For example,
to aggregate 10.0.1.0/24, 10.0.2.0/24, and 10.0.3.0/24, enter the IP address 10.0.0.0 and the network
mask 255.255.0.0.
The as-set parameter causes the device to aggregate AS-path information for all the routes in the
aggregate address into a single AS-path.
The summary-only parameter prevents the device from advertising more specific routes contained
within the aggregate route.
The suppress-map map-name parameter prevents the more specific routes contained in the specified
route map from being advertised.
The advertise-map map-name parameter configures the device to advertise the more specific routes in
the specified route map.
The attribute-map map-name parameter configures the device to set attributes for the aggregate
routes based on the specified route map.
NOTE
For the suppress-map , advertise-map , and attribute-map parameters, the route map must already
be defined.
Configuring BGP4 restart
BGP4 restart can be configured for a global routing instance or for a specified Virtual Routing and
Forwarding (VRF) instance. The following sections describe how to enable the BGP4 restart feature.
BGP4 restart is enabled by default.
Configuring BGP4 Restart for the global routing instance
Use the following command to enable the BGP4 Restart feature globally on a device.
device(config)# router bgp
device(config-bgp-router)# graceful-restart
Syntax: [no] graceful-restart
Aggregating routes advertised to BGP4 neighbors
FastIron Ethernet Switch Layer 3 Routing Configuration Guide 429
53-1003087-04