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Configure LNM Support
BC-130
Bridging and IBM Networking Configuration Guide
The command can be used to terminate all LNM server input and reporting links. In normal
circumstances, this command should not be necessary because it is a superset of the functions
normally performed on individual interfaces by the no lnm rem and no lnm rps commands.
Disable Automatic Report Path Trace Function
Under some circumstances, such as when new hardware has been introduced into the network and
is causing problems, the automatic report path trace function can be disabled. The new hardware may
be setting bit-fields B1 or B2 (or both) of the routing control field in the routing information field
embedded in a source-route bridged frame. This condition may cause the network to be flooded by
report path trace frames if the condition is persistent. The lnm pathtrace-disabled command, along
with its options, allows you to alleviate network congestion that may be occurring by disabling all
or part of the automatic report path trace function within LNM.
To disable the automatic report path trace function, use the following command in global
configuration mode:
Prevent LNM Stations from Modifying Cisco IOS Software Parameters
Because there is now more than one way to remotely change parameters in a router (either using
SNMP or the proprietary IBM protocol), some method is needed to prevent such changes from
detrimentally interacting with each other.You can prevent any LNM station from modifying
parameters in the Cisco IOS software. It does not affect the ability of LNM to monitor events, only
to change parameters on the router.
To prevent the modification of Cisco IOS software parameters by an LNM station, use the following
command in global configuration mode:
Enable Other LRMs to Change Router Parameters
LNM has a concept of reporting links and reporting link numbers. A reporting link is simply a
connection (or potential connection) between a LAN Reporting Manager (LRM) and a bridge. A
reporting link number is a unique number used to identify a reporting link. An IBM bridge allows
four simultaneous reporting links numbered 0 through 3. Only the LRM attached on the
lowest-numbered connection is allowed to change LNM parameters in the router, and then only
when that connection number falls below a certain configurable number. In the default configuration,
the LRM connected through link 0 is the only LRM that can change LNM parameters.
Command Purpose
lnm pathtrace-disabled [all | origin] Disable LNM automatic report path
trace function.
Command Purpose
lnm snmp-only Prevent LNM stations from
modifying LNM parameters in the
Cisco IOS software.