Cisco Systems 11.0 BT manual Keepalive

keepalive

keepalive

Use the keepalive TN3270 configuration command to specify how many seconds of inactivity elapse before transmission of a DO TIMING-MARK to the TN3270 client. Use the no form of this command to cancel the keepalive period and return to the default.

keepalive seconds no keepalive

Syntax Description
seconds	Number of seconds, from 0 to 65535. A value of 0 means
	no keepalive signals are sent. The default is 1800 seconds
	(30 minutes).

Defaults

The default in TN3270 configuration mode is 1800 seconds (30 minutes).

The default in PU configuration mode is the value currently configured in TN3270 configuration mode.

Command Modes

TN3270 configuration

PU configuration

Usage Guidelines

The keepalive command can be entered in either TN3270 configuration mode or PU configuration mode. A value entered in TN3270 mode applies to all PUs for that TN3270 server, except as overridden by values entered in PU configuration mode. A no keepalive command entered in PU configuration mode will restore the keepalive value entered in TN3270 command mode.

If the client does not reply within 30 minutes of the transmission of the DO TIMING-MARK, the TN3270 server disconnects the TN3270 session. The DO TIMING-MARK is a Telnet protocol operation that does not affect the client operation.

If the IP path to the client is broken, the TCP layer will detect the failure to acknowledge the DO TIMING-MARK and initiate disconnection. This action will usually take much less than 30 minutes.

The keepalive command affects currently active and future TN3270 sessions. For example, reducing the value to a smaller nonzero value will cause an immediate burst of DO TIMING-MARKs on those sessions that have been inactive for a period of time greater than the new, smaller value.

Examples

The following command sets a keepalive disconnect value of 15 minutes (900 seconds):

keepalive 900

The following command entered in TN3270 configuration mode sets the keepalive disconnect value to 1800 seconds, the default:

no keepalive

TN3270 Server Commands 25