Cisco Systems 78-11741-02 manual Resetting a Router Using BGP Outbound Soft Reset, IPC-300

Configuring BGP

Configuring Basic BGP Features

Resetting a Router Using BGP Outbound Soft Reset

Outbound soft resets do not require any preconfiguration. Using the soft keyword specifies that a soft reset be performed. To perform an outbound soft reset, use the following command in EXEC mode:

Command	Purpose
Router# clear ip bgp {*	Performs a soft reset on the connection specified in the command.
neighbor-address peer-group-name}	The neighbor-addressargument specifies the connection to be reset. Use the
soft out
	* keyword to specify that all connections be reset.

Configuring BGP Soft Reset Using Stored Routing Policy Information

If all of the BGP routers in the connection do not support the route refresh capability, use the soft reset method that generates a new set of inbound routing table updates from information previously stored. To initiate storage of inbound routing table updates, you must first preconfigure the router using the neighbor soft-reconfigurationrouter configuration command. The clear ip bgp EXEC command initiates the soft reset, which generates a new set of inbound routing table updates using the stored information.

Remember that the memory requirements for storing the inbound update information can become quite large.To configure BGP soft reset using stored routing policy information, use the following commands beginning in router configuration mode:

	Command	Purpose
Step 1
	Router(config-router)# neighbor {ip-address	Resets the BGP session and initiates storage of
	peer-group-name}soft-reconfiguration inbound	inbound routing table updates from the specified
		neighbor or peer group. From that point forward, a
		copy of the BGP routing table for the specified
		neighbor or peer group is maintained on the router.
		The Cisco implementation of BGP supports BGP
		Versions 2, 3, and 4. If the neighbor does not accept
		default Version 4, dynamic version negotiation is
		implemented to negotiate down to Version 2.
		If you specify a BGP peer group by using the
		peer-group-nameargument, all members of the peer
		group will inherit the characteristic configured with
		this command.
Step 2
	Router# clear ip bgp {* neighbor-address	Performs a soft reset on the connection specified in
	peer-group–name}soft in	the command, using the stored routing table
		information for that connection.

See the “BGP Path Filtering by Neighbor Examples” section at the end of this chapter for an example of BGP path filtering by neighbor.

Cisco IOS IP Configuration Guide

IPC-300