PLANET WGSW-50040 - Manual (Page 107)

4.2 loopback-detection specified-vlan
Command:
loopback-detection specified-vlan
no loopback-detection specified-vlan []
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.
Example:
Enable the function of loopback detection under port 1/2 mode.
Switch(config)#interface ethernet 1/2
Switch(Config-If-Ethernet1/2)#switchport mode trunk
Switch(Config-If-Ethernet1/2)#switchport trunk allowed vlan all
Switch(Config-If-Ethernet1/2)#loopback-detection specified-vlan 1;3;5-20
Switch(Config-If-Ethernet1/2)#no loopback-detection specified-vlan 1;3;5-20
4.3 loopback-detection interval-time
Command:
oopback-detection interval-time
no loopback-detection interval-time
Function:
Set the loopback detection interval. The no operate closes the loopback detection interval function.