[c-nsp] Native VLAN mismatches between 2924/2950

[Mike Louis]

my bad. . must have read it as vtp mismatch instead of native vlan. thanks for the clarification. sorry for the confusion.

________________________________________
From: Gert Doering [gert at greenie.muc.de]
Sent: Saturday, December 01, 2007 12:17 PM
To: Mike Louis
Cc: Pierre Lamy; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Native VLAN mismatches between 2924/2950

Hi,

On Fri, Nov 30, 2007 at 03:31:29PM -0500, Mike Louis wrote:
> This should also work. Its supported on the 2950 for sure. Not sure about the older 2924. This is a function of DTP running on the port.
>
> switchport nonegotiate

It's not.  Native VLAN (! no trunking here!) numbers are transported in
CDP, and the warning also comes from the CDP process.  DTP has nothing to
do with it, and "switchport nonegotiate" won't change this in any way.

The interesting thing about this error is that:

> > Nov 30 14:54:27 192.168.0.113 26469: %CDP-4-NATIVE_VLAN_MISMATCH: Native
> > VLAN mismatch discovered on FastEthernet0/15 (0), with SW1
> > FastEthernet0/18 (1).

... the switch that's printing this message is claiming that it's own port
is in VLAN 0 (!), not in VLAN 1.

Usually, these messages look like this:

Nov 24 23:49:29 sw18-XXX: %CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on FastEthernet0/4 (69), with sw34-xxx GigabitEthernet0/22 (1).

which means "vlan 69 on my fa0/4 is not the same as vlan 1 on sw34-xx:g0/22".

The original poster's switch has a "(0)" in the field for "local VLAN",
and that's definitely weird.

"Upgrade to the most recent firmware".

gert
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