Thank you for getting back to me so quickly.
I will try this out later today when it's quieter and create the loop again. If it does shut down the ports as we hope that'll be fantastic. I will get back to you as soon as I've tried it.
Original Message:
Sent: May 30, 2025 09:40 AM
From: parnassus
Subject: Loop Protect on 6300 Switch Failed to Prevent a Loop.
Hi, maybe I'm wrong but your configuration probably lacks of:
loop-protect vlan 109,308
and perform a:
show loop-protect 1/1/41 (as example)
Would be nice then to see, after adding the above configuration on all involved edge-interfaces, what is going to happen if you manually create (on purpose) a loop between two of them.
Original Message:
Sent: May 30, 2025 09:24 AM
From: Burnside
Subject: Loop Protect on 6300 Switch Failed to Prevent a Loop.
Hello,
I have a question about Loop Protection on the 6300 switch. Are there any scenarios where 'Loop Protect' could fail to prevent a loop on the edge ports?
We had an incident recently where a couple of ports started flapping due to a loop which had been accidently created. Although the ports were configured with Loop Protect, the weren't automatically disabled when the loop occurred.
Here is the port configuration:
interface 1/1/41
description DATA AND VOICE
no shutdown
no routing
vlan trunk native 109
vlan trunk allowed 109,308
loop-protect
port-access onboarding-method concurrent enable
aaa authentication port-access client-limit 3
aaa authentication port-access dot1x authenticator
enable
aaa authentication port-access mac-auth
enable
Many thanks in advance
Burnside