VLAN mismatch

Answered Question
Jun 19th, 2008

One of my switches is complaining about a VLAN mismatch on two of it's ports.

I know what is causing it but want to make sure it won't be a problem.

One of the ports is in our DMZ VLAN.

We recently bought a Barracuda Web Application Firewall device. This device runs in bridged mode and our web server is supposed to sit behind it.

I created another VLAN (DMZ2) and moved the webserver into this VLAN. The Barracuda is plugged into both VLAN's and bridges the traffic. The two ports that are complaining are the two this Barracuda are plugged into.

Hopefully this makes sense. Can I safely ignore the Warning the switch is generating? The traffic seems to be flowing just fine.

Thanks,

Denny

I have this problem too.
0 votes
Correct Answer by srue about 8 years 5 months ago

if you disable cdp on those ports you'll stop getting those messages. native vlan information is contained within cdp frames and that's probably the cause of the messages.

http://www.cisco.com/en/US/docs/ios/12_1/configfun/configuration/guide/fcd301c.html

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dennylester Thu, 06/19/2008 - 10:11

Thank you so much for the response. I kinda figured there was a way to prevent it.

Thank you again,

Denny

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