Qtech QSW-8200-28T-POEAC- DC [24/85] Loopback detection control recovery timeout

User Manual

Chapter 3. Commands for Port Loopback Detection Function 24

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 Switch(config)#interface ethernet 1/0/2

 Switch(Config-If-Ethernet1/0/2)#loopback-detection control shutdown

 Switch(Config-If-Ethernet1/0/2)#no loopback-detection control

3.3 loopback-detection control-recovery timeout

 Command: loopback-detection control-recovery timeout <0-3600>

 Function: This command is used to recovery to uncontrolled state after a special time

when a loopback being detected by the port entry be controlled state.

 Parameters: <0-3600> second is recovery time for be controlled state, 0 is not recovery

state.

 Default: The recovery is not automatic by default.

 Command Mode: Global Configuration Mode.

 Usage Guide: When a port detects a loopback and works in control mode, the ports

always work in control mode and not recover. The port will not sent packet to detection

in shutdown mode, however, the port will sent loopback-detection packet to detection

whether have loopback in block or learning mode. If the recovery time is configured,

the ports will recovery normal state when the overtime is time-out. The recovery time

is a useful time for shutdown control mode, because the port can keep on detection

loopback in the other modes, so suggest not to use this command.

 Examples: Enable automatic recovery of the loopback-detection control mode after

30s.

 Switch(config)#loopback-detection control-recovery timeout 30

3.4 loopback-detection interval-time

 Command: loopback-detection interval-time <loopback> <no-loopback>

 no loopback-detection interval-time

 Function: Set the loopback detection interval. The no operate closes the loopback

detection interval function.

 Parameters: <loopback > the detection interval if any loopback is found, ranging from 5

to 300, in seconds.

 <no-loopback > the detection interval if no loopback is found, ranging

from 1 to 30, in seconds.

 Default: The default value is 5s with loopbacks existing and 3s otherwise.

 Command Mode: Global Mode.

 Usage Guide: When there is no loopback detection, the detection interval can be

relatively shorter, for too short a time would be a disaster for the whole network if

there is any loopback. So, a relatively longer interval is recommended when loopbacks

exist.

 Example: Set the loopback diction interval as 35, 15.

 Switch(config)#loopback-detection interval-time 35 15