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H3C Loopback Detection Feature Manual

Release 2107

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.

If you have not enabled the loopback port auto-shutdown function on the access

port, the port will automatically resume the normal forwarding state after the loop is

removed.

If a loop is found on a trunk or hybrid port, the system sends log messages to the

terminal. If you have additionally enabled the loopback port control function or the

loopback port auto-shutdown function, the system will deal with the port

accordingly:

If the loopback port control function is enabled on the port (with the

loopback-detection control enable command), 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. After the

loop is removed, the port will automatically resume the normal forwarding state.

If the loopback port auto-shutdown function is enabled on the port (with the

loopback-detection shutdown enable command), 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.

Note:

The loopback detection function on a specific port can take effect only after you enable

the loopback detection function globally (in system view) and on the port (in the

specified port view).

By default, the loopback detection function is enabled globally and on ports if the device

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

configuration, this function is disabled.

Related command: loopback-detection control enable, loopback-detection

shutdown enable.

Example

# Enable the loopback detection function on Ethernet 1/0/1.

<H3C> system-view

System View: return to User View with Ctrl+Z.

[H3C] loopback-detection enable

[H3C] interface ethernet 1/0/1

[H3C-Ethernet1/0/1] loopback-detection enable

Chapter 2 Loopback Detection Configuration

2-3

Commands