Chapter 16
| Loopback Detection Commands
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Command Usage
â—† When the response to a detected loopback condition is set to block user traffic,
loopback detection control frames may untagged or tagged depending on the
port’s VLAN membership type.
â—† When the response to a detected loopback condition is set to block user traffic,
ingress filtering for the port is enabled automatically if not already enabled by
the switchport ingress-filtering command. The port’s original setting for ingress
filtering will be restored when loopback detection is disabled.
â—† 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.
â—† 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.
â—† 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 block user traffic.
Console(config)#loopback-detection action block
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
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