Cisco Systems 3750E manual Monitoring and Maintaining BGP, 38-63

Chapter 38 Configuring IP Unicast Routing

Configuring BGP

Beginning in privileged EXEC mode, use these commands to configure BGP route dampening:

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	router bgp autonomous-system	Enter BGP router configuration mode.
Step 3
	bgp dampening	Enable BGP route dampening.
Step 4
	bgp dampening half-life reuse suppress	(Optional) Change the default values of route dampening
	max-suppress [route-mapmap]	factors.
Step 5
	end	Return to privileged EXEC mode.
Step 6
	show ip bgp flap-statistics [{regexp regexp}	(Optional) Monitor the flaps of all paths that are flapping. The
	{filter-list list} {address mask [longer-prefix]}]	statistics are deleted when the route is not suppressed and is
		stable.
Step 7
	show ip bgp dampened-paths	(Optional) Display the dampened routes, including the time
		remaining before they are suppressed.
Step 8
	clear ip bgp flap-statistics [{regexp regexp}	(Optional) Clear BGP flap statistics to make it less likely that a
	{filter-list list} {address mask [longer-prefix]}	route will be dampened.
Step 9
	clear ip bgp dampening	(Optional) Clear route dampening information, and unsuppress
		the suppressed routes.
Step 10
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

To disable flap dampening, use the no bgp dampening router configuration command without keywords. To set dampening factors back to the default values, use the no bgp dampening router configuration command with values.

Monitoring and Maintaining BGP

You can remove all contents of a particular cache, table, or database. This might be necessary when the contents of the particular structure have become or are suspected to be invalid.

You can display specific statistics, such as the contents of BGP routing tables, caches, and databases. You can use the information to get resource utilization and solve network problems. You can also display information about node reachability and discover the routing path your device’s packets are taking through the network.

Table 38-8lists the privileged EXEC commands for clearing and displaying BGP. For explanations of the display fields, see the Cisco IOS IP Command Reference, Volume 2 of 3: Routing Protocols, Release 12.2.

Table 38-11	IP BGP Clear and Show Commands
Command		Purpose
clear ip bgp address		Reset a particular BGP connection.
clear ip bgp *		Reset all BGP connections.
clear ip bgp peer-group tag		Remove all members of a BGP peer group.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02		38-63