How To Check For A Network Loop Without Disabling Any Ports
How to check/test for a network loop without disabling the ports if a loop is detected.
You can test/check for network loops without disabling any ports by using Loop-Protect and setting the Receiver-Action to "no-disable".
This will allow the switch to check for a loop. If one is detected, it will add an entry to the event log, but will not disable the port.
You can then view the event log to determine which port(s) a loop was detected.
Use the following commands to enable Loop-Protect without disabling any ports:
loop-protect all receiver-action no-disable
loop-protect <port#> (use "loop-protect all" to enable this on all ports)
Note: Be sure to configure the receiver-action first, so no ports are disabled once loop-protect is enabled.
If you later decide to take a different action on the port(s), the following receiver-action options are available using Loop-Protect:
send-disable Disable the sending port when a loop is detected. This is the default.
no-disable Do not disable the sending port when a loop is detected.
send-recv-dis Disable the sending and receiving port when a loop is detected.
To disable Loop-Protect, use the following command:
no loop-protect <port#> (use "no loop-protect all" to disable this on all ports)