Configuring BGP4
5.Enter the confederation ID in the Confederation ID field. The confederation ID must be different from the sub- AS numbers. You can specify a number from 1 – 65535.
6.Enter the AS numbers of the peers (sub-ASs) within the confederation in the Confederation Peers field. Separate the AS numbers with spaces. You must specify all the sub-ASs contained in the confederation. All the routers within the same sub-AS use IBGP to exchange router information. Routers in different sub-ASs within the confederation use EBGP to exchange router information. You can specify a number from 1 – 65535.
7.Click the Apply button to apply the changes to the device’s running-config file.
8.Select the Save link at the bottom of the dialog, then select Yes when prompted to save the configuration change to the startup-config file on the device’s flash memory.
Aggregating Routes Advertised to BGP4 Neighbors
By default, the routing switch advertises individual routes for all the networks. The aggregation feature allows you to configure the routing switch to aggregate routes in a range of networks into a single CIDR number. For example, without aggregation, the routing switch will individually advertise routes for networks 207.95.1.0, 207.95.2.0, and 207.95.3.0. You can configure the routing switch to instead send a single, aggregate route for the networks. The aggregate route would be advertised as 207.95.0.0.
NOTE: To summarize CIDR networks, you must use the aggregation feature. The auto summary feature does not summarize networks that use CIDR numbers instead of class A, B, or C numbers.
To aggregate routes, use either of the following methods.
USING THE CLI
To aggregate routes for 209.157.22.0, 209.157.23.0, and 209.157.24.0, enter the following command:
HP9300(config-bgp-router)# aggregate-address 209.157.0.0 255.255.0.0
Syntax: 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, 10.0.2.0, and 10.0.3.0, enter the IP address 10.0.0.0 and the network mask 255.255.0.0.
The as-setparameter causes the router to aggregate AS-path information for all the routes in the aggregate address into a single AS-path.
The summary-onlyparameter prevents the router 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 router to advertise the more specific routes in the specified route map.
The attribute-map<map-name> parameter configures the router to set attributes for the aggregate routes based on the specified route map.
NOTE: For the suppress-map, advertise-map, and attribute-mapparameters, the route map must already be defined. See “Defining Route Maps” on page 10-59for information on defining a route map.
USING THE WEB MANAGEMENT INTERFACE
1.Log on to the device using a valid user name and password for read-write access. The System configuration panel is displayed.
2.Click on the plus sign next to Configure in the tree view to expand the list of configuration options.
