Chapter 16
| Loopback Detection Commands
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Command Usage
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When a port receives a control frame sent by itself, this means that the port is in
looped state, and the VLAN in the frame payload is also in looped state with the
wrong VLAN tag. The looped port is therefore shut down.
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Use the loopback-detection recover-time command to set the time to wait
before re-enabling an interface shut down by the loopback detection process.
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When the loopback detection response is changed, any ports placed in
shutdown state by the loopback detection process will be immediately
restored to operation regardless of the remaining recover time.
Example
This example sets the loopback detection mode to shut down user traffic.
Console(config)#loopback-detection action shutdown
Console(config)#
loopback-detection
recover-time
This command specifies the interval to wait before the switch automatically
releases an interface from shutdown state. Use the
no
form to restore the default
setting.
Syntax
loopback-detection recover-time
seconds
no
loopback-detection recover-time
seconds - Recovery time from shutdown state. (Range: 60-1,000,000
seconds, or 0 to disable automatic recovery)
Default Setting
60 seconds
Command Mode
Global Configuration
Command Usage
â—†
When the loopback detection mode is changed, any ports placed in shutdown
state by the loopback detection process will be immediately restored to
operation regardless of the remaining recover time.
â—†
If the recovery time is set to zero, all ports placed in shutdown state can be
restored to operation using the loopback-detection release command. To
restore a specific port, use the no shutdown command.
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