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Local7.Warning xxx.xxx.xxx.xxx %CDP-W-NATIVE_VLAN_MISMATCH:

Posted on 2013-12-07
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Last Modified: 2013-12-23
I have two Cisco SG300-20 switches.
One is being used as a central LAN switch and one is being used as an internet switch (i.e. to connect devices with public addresses).

I want to be able to access the internet switch for switch management from inside the LAN.
The public addressed devices are on VLAN1.
So, I've set up VLAN 2 and assigned one port to that VLAN.
Then, I've assigned a LAN IP address to the switch and can access it via this port/VLAN2.

This VLAN2 port on the internet switch connects to port ge10 on the LAN switch (which is operating everything on VLAN1 for *that* switch).  There are no trunks or tagging.

I'm getting messages:

Local7.Warning xxx.xxx.xxx.xxx %CDP-W-NATIVE_VLAN_MISMATCH:
Native VLAN mismatch detected on interface gi10.

I have tried to supress these messages using the command line interface to the switches but the commands I found and tried seem to not be available on these switches.

Is there a way to shut this warning off?  
What if I put everything on the LAN switch on *its* VLAN2?  Would that help?
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Question by:Fred Marshall
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Expert Comment

by:Don Johnston
ID: 39703725
Is there a way to shut this warning off?  
Yes. Resolve the VLAN mismatch and the warnings will stop.  Or you can disable logging or disable CDP. But fixing the VLAN mismatch is the "right" way to fix it.

What if I put everything on the LAN switch on *its* VLAN2?  Would that help?
I think that will fix your problem.  It sounds like the port on the internet switch that your LAN switch is connected to is in VLAN 2. So if you change the g10 port on the LAN switch to VLAN 2, that will eliminate the VLAN mismatch.
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by:Fred Marshall
ID: 39704726
Well, I've never done it that way before - so I could use a little more coaching.  If I switch the g10 port switch to a new VLAN2 on the LAN switch then how will that port communicate onto VLAN1 where everything else (including my workstation) is located?
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Don Johnston earned 500 total points
ID: 39704732
You would need to configure all the ports that are currently members of VLAN 1 to be members of VLAN 2.
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