Cisco Systems 78-11741-02 manual Adjusting Virtual Server Values, IPC-144

Configuring Server Load Balancing

IOS SLB Configuration Task List

Adjusting Virtual Server Values

To change the default settings of the virtual server values, use the following commands in SLB virtual server configuration mode as needed:

Command	Purpose
Router(config-slb-vserver)# client ip-addressnetwork-mask	Specifies which clients are allowed to use the
	virtual server.
Router(config-slb-vserver)# delay duration	Specifies the amount of time IOS SLB maintains
	TCP connection context after a connection has
	terminated. The default value is 10 seconds.
Router(config-slb-vserver)# idle duration	Specifies the minimum amount of time IOS SLB
	maintains connection context in the absence of
	packet activity. The default value is 3600 seconds
	(1 hour).
Router(config-slb-vserver)# sticky duration [group group-id]	Specifies that connections from the same client
	use the same real server, as long as the interval
	between client connections does not exceed the
	specified duration.
Router(config-slb-vserver)# synguard syn-count interval	Specifies the rate of TCP SYNs handled by a
	virtual server in order to prevent a SYN flood
	denial-of -service attack.

Preventing Advertisement of Virtual Server Address

By default, virtual server addresses are advertised. That is, static routes to the Null0 interface are installed for the virtual server addresses. To advertise these static routes using the routing protocol, you must configure redistribution of static routes for the routing protocol. To prevent the installation of a static route, use the following command in SLB virtual server configuration mode:

Command	Purpose
Router(config-slb-vserver)# no advertise	Omits the virtual server IP address from the
	routing protocol updates.

Enabling the Virtual Server for Service

To place the virtual server into service, use the following command in SLB virtual server configuration mode:

Command	Purpose
Router(config-slb-vserver)# inservice	Enables the virtual server for use by IOS SLB.

Cisco IOS IP Configuration Guide

IPC-144