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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