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H3C Loopback Detection Feature Manual

Release 2107

After the loop is removed, the port will automatically resume the normal forwarding

state.

With the function disabled on the trunk or hybrid port, the system will only send log

messages to the terminal, and the port is still in the normal forwarding state.

By default, the loopback port control function is enabled on ports if the device boots with

the default configuration file (config.def); if the device boots with null configuration, this

function is disabled.

Note that this command is invalid for an access port.

Related command: loopback-detection enable.

Example

# Enable the loopback port control function on Ethernet 1/0/1.

<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 control enable

2.1.2 loopback-detection enable

Syntax

loopback-detection enable

undo loopback-detection enable

View

System view or Ethernet port view

Parameter

None

Description

Use the loopback-detection enable command to enable the loopback detection

function on the current port to detect whether an external loopback occurs on the port.

Use the undo loopback-detection enable command to disable the loopback

detection function on the port.

If a loop is found on an access port, the system will set the port to the block state

(ports in this state cannot forward data packets), send log messages to the

terminal, and remove the corresponding MAC forwarding entry.

If you have enabled the loopback port auto-shutdown function (with the

loopback-detection shutdown enable command) on the access port, the system

Chapter 2 Loopback Detection Configuration

2-2

Commands