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H3C Loopback Detection Feature Manual
Release 2107
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.
<H3C> system-view
System View: return to User View with Ctrl+Z.
[H3C] interface ethernet 1/0/1
[H3C-Ethernet1/0/1] port link-type trunk
[H3C-Ethernet1/0/1] loopback-detection per-vlan enable
2.1.6 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:
With the function enabled on the port, the system will shut down the port, and send
log messages to the terminal. After the loop is removed, you need to use the undo
shutdown command to bring up the port.
With the function disabled on the port, the system will only send log messages to
the terminal, and the port is still in the normal forwarding state.
Chapter 2 Loopback Detection Configuration
2-6
Commands
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