Cisco Systems 78-11741-02 manual BGP Conditional Advertisement Configuration Task List, IPC-315

Configuring BGP

Configuring Advanced BGP Features

BGP Conditional Advertisement Configuration Task List

See the following section for configuration tasks for the BGP Conditional Advertisement feature. Each task in the list indicates if the task is optional or required.

•Configure the route-maps that will be used in conjunction with the advertise-map and the non-exist-map. This step may include the configuration of access-lists or prefix-lists. (Required)

•Configure the router to run BGP. (Required)

•Configure the advertise-map and the non-exist-map with the neighbor advertise-mapnon-exist-maprouter configuration command. (Required)

•Verify that the BGP Condition Advertisement feature has been configured with the show ip bgp neighbor command. (Optional)

Conditional Advertisement of a Set of Routes

To conditionally advertise a set of routes, use the following commands beginning in router configuration mode:

	Command	Purpose
Step 1
	Router(config)# router bgp as-number	Configures the router to run a BGP process.
Step 2
	Router(config-router)# neighbor ip-addressremote-as	Specifies the peer that should receive conditional
	as-number	advertisement for a given set routes.
Step 3
	Router(config-router)# neighbor ip-addressadver-	Configures the advertise-map and non-exist map
	tise-map map1 non-exist-map map2	for the BGP Conditional Advertisement feature.

See the “BGP Conditional Advertisement Configuration Examples” section at the end of this chapter for an example configuration of BGP conditional advertisement.

Verifying BGP Conditional Advertisement

To verify that the BGP Condition Advertisement feature has been configured, use the show ip bgp neighbor command. The show ip bgp neighbor EXEC command will show the status of the BGP Conditional Advertisement feature as initialized or uninitialized. The following example shows output from the show ip bgp neighbor EXEC command:

router# show ip bgp neigbor 172.16.1.1

BGP neighbor is 172.16.1.1, remote AS 65200, internal link

Description:link to boston as 65200

BGP version 4, remote router ID 10.1.1.1

BGP state = Established, up for 01:04:30

Last read 00:00:30, hold time is 180, keepalive interval is 60 seconds

Neighbor capabilities:

Route refresh:advertised and received

Address family IPv4 Unicast:advertised and received

Received 83 messages, 0 notifications, 0 in queue

Sent 78 messages, 0 notifications, 0 in queue

Route refresh request:received 0, sent 0

Minimum time between advertisement runs is 5 seconds

For address family:IPv4 Unicast

BGP table version 18, neighbor version 18

Index 2, Offset 0, Mask 0x4

Cisco IOS IP Configuration Guide

IPC-315