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loopback-detection per-vlan enable
Syntax
loopback-detection per-vlan enable
undo loopback-detection per-vlan enable
View
Ethernet port view
Parameter
None
Description
Use the loopback-detection per-vlan enable command to configure the system to run loopback
detection on all VLANs of the current trunk or hybrid port.
Use the undo loopback-detection per-vlan enable command to restore the default setting.
By default, the system runs loopback detection only on the default VLAN of the trunk or hybrid port.
Note that the command is invalid for any access port.
Example
# Configure the system to run loopback detection on all VLANs of the trunk port Ethernet1/0/1.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] interface ethernet 1/0/1
[Sysname-Ethernet1/0/1] port link-type trunk
[Sysname-Ethernet1/0/1] loopback-detection per-vlan enable
loopback-detection shutdown enable
Syntax
loopback-detection shutdown enable
undo loopback-detection shutdown enable
View
Ethernet port view
Parameter
None
Description
Use the loopback-detection shutdown enable command to enable the loopback port auto-shutdown
function.
Use the undo loopback-detection shutdown enable command to disable the function.
The loopback port auto-shutdown function works in conjunction with the loopback detection function
(refer to
loopback-detection enable). If a loop is found at a port:
z With the function enabled on the port, the system will shut down the port, and send log and trap
messages to the terminal. After the loop is removed, you need to use the undo shutdown
command to bring up the port.
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