Planet Networking & Communication SGS-6340-24T4S Command Manual page 879

Default:
Do not preempt.
Command mode:
ULPP group configuration mode.
Usage Guide:
If the preemption mode configured by ULPP group, and the slave port is in forwarding state, and the master port is in
the standby state, the master port will turn into the forwarding state and the slave port turn into the standby state after
the preemption delay.
Example:
Configure the preemption mode of ULPP group.
Switch(config)# ulpp group 20
Switch(ulpp-group-20)# preemption mode
55.16 protect vlan-reference-instance
Command:
protect vlan-reference-instance <instance-list>
no protect vlan-reference-instance <instance-list>
Function:
Configure the protective VLANs of ULPP group, the no command cancels the protective VLANs.
Parameter:
<instance-list> is MSTP instance list, such as: i; j-k. The number of the instances is not limited in the list.
Default:
Do not protect any VLANs by default that means any instances are not quoted.
Command mode:
ULPP group configuration mode.
55-327