Chapter 14
| Loopback Detection Commands
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loopback-detection This command enables loopback detection globally on the switch or on a specified
interface. Use the no form to disable loopback detection.
Syntax
[no] loopback-detection
Default Setting
Disabled
Command Mode
Global Configuration
Interface Configuration (Ethernet, Port Channel)
Command Usage
Loopback detection must be enabled globally for the switch by this command and
enabled for a specific interface for this function to take effect.
Example
This example enables general loopback detection on the switch, disables loopback
detection provided for the spanning tree protocol on port 1, and then enables
general loopback detection for that port.
Console(config)#loopback-detection
Console(config)#interface ethernet 1/1
Console(config-if)#no spanning-tree loopback-detection
Console(config-if)#loopback-detection
Console(config)#
loopback-detection
action
This command specifies the protective action the switch takes when a loopback
condition is detected. Use the no form to restore the default setting.
Syntax
loopback-detection action {block | none | shutdown}
no loopback-detection action
block - When a loopback is detected on a port which a member of a
specific VLAN, packets belonging to that VLAN are dropped at the
offending port.
none - No action is taken.
shutdown - Shuts down the interface.
Default Setting
Shutdown
Command Mode
Global Configuration
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