Configuring BGP4

NOTE: The auto summary feature summarizes only the routes that are redistributed from IGP into BGP4.

NOTE: The auto summary feature does not summarize networks that use CIDR numbers instead of class A, B, or C numbers. To summarize CIDR networks, use the aggregation feature. See “Aggregating Routes Advertised to BGP4 Neighbors” on page 10-39.

USING THE CLI

To enable auto summary, enter the following command:

HP9300(config-bgp-router)# auto-summary

To disable auto summary again, enter the following command:

HP9300(config-bgp-router)# no auto-summary

Syntax: [no] auto-summary

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.

3.Click on the plus sign next to BGP in the tree view to expand the list of BGP option links.

4.Click on the General link to display the BGP configuration panel, shown in Figure 10.2 on page 10-8.

5.Select Disable or Enable next to Auto Summary.

6.Click the Apply button to apply the changes to the device’s running-config file.

7.Select the Save link at the bottom of the dialog. Select Yes when prompted to save the configuration change to the startup-config file on the device’s flash memory.

Configuring Route Reflection Parameters

Normally, all the BGP routers within an AS are fully meshed. Each of the routers has an IBGP session with each of the other BGP routers in the AS. Each IBGP router thus has a route for each of its IBGP neighbors. For large ASs containing many IBGP routers, the IBGP route information in each of the fully-meshed IBGP routers can introduce too much administrative overhead.

To avoid this problem, you can hierarchically organize your IGP routers into clusters.

•A cluster is a group of IGP routers organized into route reflectors and route reflector clients. You configure the cluster by assigning a cluster ID on the route reflector and identifying the IGP neighbors that are members of that cluster. All the configuration for route reflection takes place on the route reflectors. The clients are unaware that they are members of a route reflection cluster. All members of the cluster must be in the same AS. The cluster ID can be any number from 1 – 4294967295. The default is the router ID, expressed as a 32-bit number.

NOTE: If the cluster contains more than one route reflector, you need to configure the same cluster ID on all the route reflectors in the cluster. The cluster ID helps route reflectors avoid loops within the cluster.

•A route reflector is an IGP router configured to send BGP route information to all the clients (other BGP4 routers) within the cluster. Route reflection is enabled on all HP BGP4 routing switches by default but does not take effect unless you add route reflector clients to the routing switch.

•A route reflector client is an IGP router identified as a member of a cluster. You identify a routing switch as a route reflector client on the routing switch that is the route reflector, not on the client. The client itself requires no additional configuration. In fact, the client does not know that it is a route reflector client. The client just knows that it receives updates from its neighbors and does not know whether one or more of those neighbors are route reflectors.

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