PLANET WGSW-52040 - Manual (Page 795)

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Usage Guide:
There is no sequence requirement for the master and slave port configuration in a group, but the protective VLANs
must be configured before the member ports. Each group has only one slave port, if the slave port exists, then the
configuration is fail.
Example:
Configure the slave port of ULPP group.
Switch(config)# interface ethernet 1/2
Switch(config-If-Ethernet1/2)# ulpp group 20 slave