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ネットワーク・ハードウェア 3Com H3CのPDF マニュアルをオンラインで閲覧またはダウンロードできます。3Com H3C 11 ページ。 Loopback detection feature manual

H3C Loopback Detection Feature Manual

Release 2107

Chapter 1 Loopback Detection Configuration

Note:

Two functions are added to release 2107: configuring loopback detection for a list of

ports in bulk, and enabling auto-shutdown of loopback ports.

Loopback detection is used to monitor if a port of a switch is looped back.

After you enable loopback detection on Ethernet ports, the switch can monitor if an

external loopback occurs on them. If there is a loopback port found, the switch will deal

with the loopback port according to your configuration.

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 additionally enabled the loopback port auto-shutdown function 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.

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

Chapter 1 Loopback Detection Configuration

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