Configuring Loopback Detection LBD Overview
OmniSwitch AOS Release 8 Network Configuration Guide December 2017 page 7-4
LBD Overview
Loopback Detection (LBD) automatically detects and prevents L2 forwarding loops on a port. LBD
operates in addition to STP which detects forwarding loops. When a loopback is detected, the port is
disabled and goes into a shutdown state. A trap is sent and the event is logged.
When enabling and configuring Loopback Detection:
• Enable Loopback Detection globally on the switch.
• Enable Loopback Detection on edge port.
The switch periodically sends out LBD frame from loopback detection enabled port and concludes that the
port is looped back if it receives the frame on any of the loop-back detection enabled ports.
Remote-origin LBD can be enabled and configured per port to process the LBD frames received from a
remote system.
For service-access ports, LBD detects the loop for all the LBD edge ports involved.
Transmission Timer
Transmission timer is the time duration in seconds at which the port sends LBD frame on the link. When
any port is getting blocked due to loopback detection, there will be no further transmission and receiving
of any traffic on the blocked port. The port will be go to shutdown state.
By default, the transmission timer for loopback detection is 30 seconds.
Remote-origin LBD Overview
The remote-origin LBD processes the LBD frames originating from a remote system. The frame is
processed and the receiving port is moved to shut down state.
The remote-origin LBD is functional, only if both default LBD and remote-origin LBD are enabled
globally and at interface level. For the remote-origin LBD to operate:
• Default LBD must be enabled globally
• Remote-origin LBD must be enabled globally
• Default LBD must be configured on the interface
• Remote-origin LBD must be configured on the LBD enabled interface
The following scenario shows the operation of the remote-origin LBD functionality:
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