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

[Gert Doering]

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
-- 
USENET is *not* the non-clickable part of WWW!
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
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