I have a 6500, running CatOS 7.6(2), directly connected to a 3500xl (running IOS 12.0(5)) with Cat5. I am *not* trunking between them. Each port is running under a different native VLANs, which I wouldn't think was an issue since they aren't trunking. The connection works fine, and packets flow between them as expected, but my 6500 complains about a native VLAN mismatch on that port. Is this a bug on the CatOS side? The 3500xl doesn't seem to complain about the native vlans being different.
This is a normal message and doesn't hurt anything , to get rid of it as you said put them both in the same native vlan or you can turn down the logging for cdp so that it doesn't report it , think these were cdp messages , just going off the top of my head.
There are CDP messages to confirm? Also if you are sure there is no trunk config then I am sure you have a vlan mismatch by which I mean the port which you have used to connect 2 switches are in different access vlan? Am I correct?
If yes there will be a data transfer but you will get this meesage and as GLEN suggested to make the vlan information same on both the sides or reduce the logging level for CDP or just disable CDp is possible.
We are pleased to announce availability of Beta software for 16.6.3.
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