Wired Intelligent Edge

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

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.

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.

Many thanks

Burnside