C613-50631-01 Rev A Command Reference for IE340 Series 578
AlliedWare Plus™ Operating System - Version 5.5.3-0.x
SWITCHING COMMANDS
LOOP
-PROTECTION LOOP-DETECT
loop-protection loop-detect
Overview Use this command to enable the loop-protection loop-detect feature and
configure its parameters.
Use the no variant of this command to disable the loop-protection loop-detect
feature.
Syntax
loop-protection loop-detect [ldf-interval <period>]
[ldf-rx-window <frames>] [fast-block]
no loop-protection loop-detect
Default The loop-protection loop-detect feature is disabled by default. The default interval
is 10 seconds, and the default window size is 3 frames.
Mode Global Configuration
Usage notes If transmitting of loop-detection frames takes too long, then it can time out and the
switch may not send all loop-detection frames, and therefore may not detect a
loop. This can happen in some networks with large numbers of loop-protection
instances with short loop-detection intervals. In this case, the switch generates a
log message:
“Sending loop-detection frames taking longer than expected - too many
instances?”
To prevent this log message, you can either:
• change the loop-detection frame interval to a higher value to reduce the
number of packets that are sent in each block. To do this, use the command
loop-protection loop-detect ldf-interval <period>, or
• reduce the number of instances by reducing the number of VLANs per port
or by removing loop protection from some ports.
The show loop-protection command shows the total number of loop-protection
instances (one instance per VLAN per port) and the number of packets that need
Parameter Description
ldf-interval The time (in seconds) between successive loop-detect frames
being sent.
<period> Specify a period between 1 and 600 seconds. The default is 10
seconds.
ldf-rx-window The number of transmitted loop detect frames whose details
are held for comparing with frames arriving at the same port.
<frames> Specify a value for the window size between 1 and 5 frames.
The default is 3 frames.
fast-block The fast-block blocks transmitting port to keep partial
connectivity.
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