Cisco Systems 6000 manual Configuring TCP Parameters, Configuring Dynamic Feedback Protocol

Configuring the Content Switching Module

This example shows how to configure a virtual server named barnett, associate it with the server farm named bosco, and configure a sticky connection with a duration of 50 seconds to sticky group 12:

Router(config)# ip slb vserver barnett

Router(config-slb-vserver)# virtual 12.3.23.4 tcp 34

Router(config-slb-vserver)# serverfarm bosco

Router(config-slb-vserver)# sticky 50 group 12

Router(config-slb-vserver)# end

Router# show ip slb vservers

Configuring TCP Parameters

Transmission Control Protocol (TCP) is a connection-oriented protocol that uses known protocol messages for activating and deactivating TCP sessions. In server load balancing, when adding or removing a connection from the connection database, the Finite State Machine correlates TCP signals such as SYN, SYN/ACK, FIN, and RST. When adding connections, these signals are used for detecting server failure and recovery and for determining the number of connections per server.

Note		The CSM also supports User Datagram Protocol (UDP). Because UDP is not connection-oriented,
		protocol messages cannot be generically sniffed (without knowing details of the upper-layer
		protocol) to detect the beginning or end of a UDP message exchange. Detection of UDP connection
		termination is based on a configurable idle timer. Protocols requiring multiple simultaneous
		connections to the same real server (such as FTP) are supported. Internet Control Management
		Protocol (ICMP) messages (such as ping) destined for the virtual IP address are also handled.
		To configure TCP parameters, perform this task:
	Command		Purpose
Step 1
	Router(config)# ip slb vserver		Identify the virtual server and enter the virtual server
	virtserver-name		configuration mode1,2.
Step 2	Router(config-slb-vserver)# idle duration		Configure the amount of time (in seconds)
			connection information is maintained in the absence
			of packet activity for a connection2.

1.Enter the exit command to leave a mode or submode. To return to the Router (config)> top level of the menu, enter the end command.

2.The no form of this command restores the defaults.

This example shows how to configure TCP parameters for virtual servers:

Router(config)# ip slb vserver barnett

Router(config-slb-vserver)# idle 10

Configuring Dynamic Feedback Protocol

Configuring the Dynamic Feedback Protocol (DFP) allows servers to provide feedback to the CSM to enhance load balancing. The DFP mechanism in server load balancing allows host agents (residing on the physical server) to dynamically report the change in status of the host systems providing a virtual service.

	Catalyst 6000 Family Content Switching Module Installation and Configuration Note
78-11631-02 Rev. A0		31