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

CLI Reference Guide

453

loopback-detection (global)

Use the command to enable global loopback detection function. Use no form to

disable the function.

loopback-detection

no loopback-detection

Syntax None.

Default Disabled.

Command Mode Configuration mode.

Usage Guideline Used to enable or disable the LBD function globally.

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.

Example This example shows how to enable loopback detection function.

You can verify your settings by entering the show loopback-detection command.

Switch(config)# loopback-detection

Switch(config)#