Chapter 16
| 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
mode
This command specifies shutdown by dropping packets for a port detected in
loopback state or by dropping packets belonging to a VLAN detected in loopback
state. Use the no form to restore the default setting.
Syntax
loopback-detection mode {port-based | vlan-based}
no loopback-detection mode
port-based - When loopback is detected on a port, the port is shut down
automatically.
vlan-based - When loopback is detected on a port which a member of a
specific VLAN, packets belonging to that VLAN are dropped at the port.
Default Setting
port-based
Command Mode
Global Configuration
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