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DGS-6600 Series Switch m loopback-detection (interface)

CLI Reference Guide

454

loopback-detection (interface)

Use the command to enable interface loopback detection function. Use the no

form to disable the function.

loopback-detection

no loopback-detection

Syntax None.

Default Disabled.

Command Mode Interface mode.

Usage Guideline The command is available for port and port channel interface configuration.

When a port enables the loopback-detection (LBD) function, and switch is in

forwarding state, will periodically sends out CTP packets with the SA field set to

device's MAC, DA field set to CF-00-00-00-00-00. Type is "90-00". If the port is

an untagged member of a VLAN, this port will send out the untagged CTP

packet. If the port is only tagged member of VLAN, then this port will send out the

tagged packet with one of the VLAN ID to which this port belonged.

When the switch detects that a CTP packet sent out by the port has been looped

back to the packet originating port, it will put this port into error disabled state or

block the traffic which belong to this VLAN according to the detection mode user

configured.

There are two kinds of recovery mechanisms provide, user can bring it out of this

state by entering the "errdisable recovery cause loopback-detection" global

configuration command. Alternatively, the user can manually re-enable the port

by entering the "shutdown" then "no shutdown" command in interface-

configuration mode.

The LBD will work only when both the global setting and port setting are enabled.

Example This example shows how to enable loopback detection function on port3.1.

Prompt message at screen

Description

Cannot enable LBD on the port as it is

STP enabled.

STP and LBD should be mutually exclusive on the same

port.

Switch(config)# interface eth3.1

Switch(config-if)# loopback-detection

Switch(config-if)#