Configuring Loopback Detection LBD for Service Access Interface
OmniSwitch AOS Release 8 Network Configuration Guide December 2017 page 7-8
To enable remote-origin LBD on multiple ports, specify a range of ports. For example:
-> loopback-detection port 3/1/1-8 remote-origin enable
Note. See “Remote-origin LBD Overview” on page 7-4 for more details.
Configuring the LBD Transmission Timer
To configure the transmission time period between LBD packet transmissions, use the loopback-
detection service-access command. For example:
-> loopback-detection transmission-timer 200
Viewing LBD Statistics
To view the LBD statistics on a specific port, use the show loopback-detection statistics port command.
For example, to view the statistics for port 1 on slot 1 of chassis 1, enter:
-> show loopback-detection statistics port 1/1/1
Recovering a Port from LBD Shutdown
To bring a port out of the shutdown state, use the interfaces fec command. For example, to bring the
chassis 1, port 5 on slot 1 out of the shutdown state, enter:
-> clear-violation port 1/1/5
To bring multiple ports out of the shutdown state, enter:
-> clear-violation port 1/5/5-10
Configuring Autorecovery-timer for LBD shutdown ports
The port which is shutdown due to LBD can be automatically recovered if autorecovery-timer is set for
the switch. To set the autorecovery-timer, use the loopback-detection autorecovery-timer command. For
example, to set a autorecovery-timer of 200 sec for the switch, enter:
-> loopback-detection autorecovery-timer 200
LBD for Service Access Interface
A provider network with a set of multiple switches interconnected together can be logically viewed as a
large single switch. The large single switch provides service access points to customers' networks.
Configuration faults in customer networks can result in loops spanning both provider and customer
networks. This can result in broadcast storms. In order to protect provider's network from broadcast
storms, loops that involve SAP ports need to be detected and broken.
The LBD can detect and break loops created on the service-access interface.
For a service-access interface, LBD can be enabled for a specific port or linkagg. LBD for service-access
points allows shutting down only the specific interface of the link involved in the loop.
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