Cisco Systems BC-109 manual Change an LNM Reporting Interval, Monitor LNM Operation

Configure LNM Support

Change an LNM Reporting Interval

All stations on a Token Ring notify the Ring Error Monitor (REM) when they detect errors on the ring. In order to prevent excessive messages, error reports are not sent immediately, but are accumulated for a short interval and then reported. A station learns the duration of this interval from a router (configured as a source-route bridge) when it first enters the ring. This value is expressed in tens of milliseconds between error messages. The default is 200, or 2 seconds. The valid range is 0 to 65535.

To change an LNM reporting interval, use the following command in interface configuration mode:

Command	Purpose
lnm softerr milliseconds	Set the time interval during which
	stations report ring errors to the Ring
	Error Monitor (REM).

Enable the RPS Express Buffer Function

The RPS express buffer function allows the router to set the express buffer bit to ensure priority service for frames required for ring station initiation. When this function is enabled, the router sets the express buffer bit in its initialize ring station response. This allows Token Ring devices to insert into the ring during bursty conditions.

To enable LNM to use the RPS express buffer function, use the following command in interface configuration mode:

Command	Purpose
lnm express-buffer	Enable the RPS express buffer
	function.

Monitor LNM Operation

Once LNM support is enabled, you can monitor LNM operation. To observe the configuration of the LNM bridge and its operating parameters, use the following commands in the EXEC mode:

Step	Command	Purpose
1	show lnm bridge	Display all configured bridges and their
		global parameters.
2	show lnm config	Display the logical configuration of all
		bridges configured in the router.
3	show lnm interface [type number]	Display LNM information for an interface or
		all interfaces of the router.
4	show lnm ring [ring-number]	Display LNM information about a Token
		Ring or all Token Rings on the network.
5	show lnm station [address]	Display LNM information about a station or
		all stations on the network.

BC-132Bridging and IBM Networking Configuration Guide