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show ulsm group [group-id]
Show the configuration information of ULSM
group.
debug ulsm event
no debug ulsm event
Show the event information of ULSM, the no
operation disables the shown information.
53.3 ULSM Typical Example
ULSM typical example
The above topology is the typical application environment which is used by ULSM and ULPP
protocol.
ULSM is used to process the port state synchronization, its independent running is useless, so
it usually associates with ULPP protocol to use. In the topology, SwitchA enables ULPP
protocol, it is used to switch the uplink. SwitchB and SwitchC enable ULSM protocol to monitor
whether the uplink is down. If it is down, then ULSM will execute the down operation for the
downlink port to shutdown it, so ULPP protocol of Swtich A executes the relative operation of
the uplink switchover.
SwitchA configuration task list:
Switch(Config)#spanning-tree mst configuration
Switch(Config-Mstp-Region)#instance 1 vlan 1
Switch(Config-Mstp-Region)#exit
Switch(Config)#ulpp group 1
Switch(ulpp-group-1)#protect vlan-reference-instance 1
Switch(ulpp-group-1)#exit
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