Technical information

AX Series L2 Loop Detection Configuration Guide (Edition 2)

(3) Restoring (activating) blocked ports and removing the loop status display

After taking measures against the L2 loop status, restore blocked ports and remove the loop status display.

Follow the procedures below.

(i) Restoring the blocked ports

Use the show port command to confirm that the blocked port is in the inact status and then activate the

port.

(ii) Checking the loop status display

Execute the show loop-detection command. After that, confirm whether either of the following is true:

(a) If the activated port has a link destination, confirm that the status display of the port becomes Up, indicating

a link-up.

(b) If the activated port has no link destination, it will not enter the link-up status. Even if the show

loop-detection command is executed, the Down(loop) status still remains on the port. To remove

this status display (to change the display to the Down status display), the following two methods are

available:

Method 1: To clear the status of a specific port only, temporarily remove the send-inact-port setting

for the port from the configuration. (Temporarily specify no loop-detection

send-inact-port and then specify loop-detection send-inact-port again.)

Method 2: To clear the status of the whole device, set the L2 loop detection functionality all over again

from the configuration. (Temporarily specify no loop-detection enable and then specify

loop-detection enable again.)

After removing the status via either of the above methods, execute the show loop-detection

command again to confirm that the port is in the Down status.

#1: It is also possible to set the configuration in advance so that the port is automatically activated after a certain period of time

has passed (loop-detection auto-restore-time). In this case, the port is automatically activated when a

specified period of time has passed after detection of an L2 loop. However, the activation operation occurs even while the

L2 loop exists. In this case, L2 loop status is detected again after activation.

#2: When the status of a specific port is removed, the statistics (for the port) displayed with show loop-detection

statistics remain. When the status of the whole device is removed, the statistics displayed with show

loop-detection statistics are all removed.