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
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). |
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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 | Enable the RPS express buffer |
| function. |
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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 |
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| global parameters. |
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2 | show lnm config | Display the logical configuration of all |
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| bridges configured in the router. |
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3 | show lnm interface [type number] | Display LNM information for an interface or |
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| all interfaces of the router. |
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4 | show lnm ring | Display LNM information about a Token |
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| Ring or all Token Rings on the network. |
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5 | show lnm station [address] | Display LNM information about a station or |
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| all stations on the network. |
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