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Commands for ULPP
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Usage Guide: The preemption delay is the delay time before the master port is
preempted as the forwarding state, for avoiding the link oscillation in a short time. After
the preemption mode is enabled, the preemption delay takes effect.
Example: Configure the preemption delay as 50s for ULPP group.
Switch(config)# ulpp group 20
Switch(ulpp-group-20)# preemption delay 50
52.13 preemption mode
Command: preemption mode
no preemption mode
Function: Enable/disable the preemption mode of ULPP group.
Parameter: None.
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
52.14 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.
Usage Guide: Quote the instances of MSTP to protect the VLANs. The VLAN
corresponds to this instance is at the forwarding state on one port of this group, and at
the blocked state on another port of this group. Each ULPP group can quotes all
instances of MSTP. And it can quotes the inexistent MSTP instances that means any