PLANET WGSW-52040 - Manual (Page 459)

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57.3 ULSM Typical Example
SwitchD
E1/3 E1/4
E1/2 SwitchC SwitchB E1/1
E1/1 E1/2
SwitchA
Figure 57-2: 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
Switch(Config)#interface ethernet 1/1
Switch(config-If-Ethernet1/1)# ulpp group 1 master
Switch(config-If-Ethernet1/1)#exit
Switch(Config)#interface Ethernet 1/2
Switch(config-If-Ethernet1/2)# ulpp group 1 slave
Switch(config-If-Ethernet1/2)#exit
SwitchB configuration task list: