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Configure LNM Support
BC-132
Bridging and IBM Networking Configuration Guide
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:
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:
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:
Command Purpose
lnm softerr milliseconds Set the time interval during which
stations report ring errors to the Ring
Error Monitor (REM).
Command Purpose
lnm express-buffer Enable the RPS express buffer
function.
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.