PLANET WGSW-52040 - Manual (Page 164)

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Global Mode.
Usage Guide:
When there is no loopback detection, the detection interval can be relatively shorter, for too short a time would be a
disaster for the whole network if there is any loopback. So, a relatively longer interval is recommended when
loopbacks exist.
Example:
Set the loopback diction interval as 35, 15.
Switch(config)#loopback-detection interval-time 35 15
6.5 loopback-detection specified-vlan
Command:
loopback-detection specified-vlan <vlan-list>
no loopback-detection specified-vlan [<vlan-list>]
Function:
Enable the function of loopback detection on the port and specify the VLAN to be checked; the no operation of this
command will disable the function of detecting loopbacks through this port or the specified VLAN.
Parameters:
<vlan-list> the list of VLANs allowed passing through the port. Given the situation of a trunk port, the specified
VLANs can be checked. So this command is used to set the vlan list to be checked.
Default:
Disable the function of detecting the loopbacks through the port.
Command Mode:
Port Mode.
Usage Guide:
If a port can be a TRUNK port of multiple Vlans, the detection of loopbacks can be implemented on the basis of
port+Vlan, which means the objects of the detection can be the specified Vlans on a port. If the port is an ACCESS
port, only one Vlan on the port is allowed to be checked despite the fact that multiple Vlans can be configured. This
function is not supported under Port-channel.