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Webcast-Catalyst9k
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4-NATIVE_VLAN_MISMATCH

Hello,

My core switch (6506) is pegging me with warnings like this one:

Oct 27 23:51:29 sw2-int.XX.XX 5882: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN

mismatch discovered on FastEthernet0/1 (1), with SCAxxxxx(YYY-ZZ) 7/41 (81).

- which I am aware of, and it's perfectly fine that way - the switch

that is sending out all the complaints is an "edge switch", which has

no VLANs at all, all the ports in VLAN 1 (3550).

To get rid of the warnings, I see two possible approaches, that I both

do not like very much:

- switch off CDP, which I think is very useful

- move all ports plus management VLAN to vlan 81, which is a lot of effort, for minor gain.

What I'd really like to see is an option

"no cdp warnings vlan-mismatch "

but as far as I'm aware, it doesn't exist. Anything I'm overlooking here? Thanks in advance.

1 REPLY
Cisco Employee

Re: 4-NATIVE_VLAN_MISMATCH

Hello David,

You can change the native vlan to any dummy vlan on both port of the switches. Native vlan configuration is local to a link. Say if you dont have vlan 81 on 3550, under interface,

sw(config-if)#switchport trunk native vlan 81

HTH

Padmanabhan

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