Loopback Detection Settings

Loopback Detection (LBD) provides protection against loops by transmitting loop protocol packets out of ports on which loop protection has been enabled. When the switch sends out a loop protocol packet, and then receives the same packet, it shuts down the port that received the packet.

Loopback Detection operates independently of STP. After a loop is discovered, the port that received the loops is placed in the Shut Down state. A trap is sent and the event is logged. Network managers can define a Detection Interval that sets the time interval between LBD packets.

To enable and configure LBD, follow these steps:

Procedure

Step 1

Click Port Management > Loopback Detection Settings.

Step 2

Select Enable in the Loopback Detection to enable the feature.

Step 3

Enter the Detection Interval. This is the interval between transmission of LBD packets.

Step 4

Click Apply to save the configuration to the Running Configuration file.

The following fields are displayed for each interface, regarding the Loopback Detection State:

  • Administrative—Loopback detection is enabled.

  • Operational—Loopback detection is enabled but not active on the interface.

Step 5

Select whether to enable LBD on ports or LAGS in the Interface Type equals field in the filter.

Step 6

Select the ports or LAGs on which LBD is to be enabled and click Edit.

Step 7

Select the settings for the chosen Interface. Next, check Enable in the Loopback Detection State field for the port or LAG selected.

Step 8

Click Apply to save the configuration to the Running Configuration file.