From: Rich Collins (nilsi2002@gmail.com)
Date: Wed Oct 03 2007 - 17:44:30 ART
Only the same topic I had a similar question. How do you know if the native
VLAN is correctly configured on both sides of a static dot1q trunk? For
example you have no access to the other side. I had this case once with a
3rd party switch.
On the Cisco side the "show int trunk" looked fine and I also believe the
"sh int gi 0/x switchport" also looked fine but the native vlan was
mismatched. Is there some "show command" or what would a good debug for
this.
Rich
On 10/3/07, Joseph Saad <joseph.samir.saad@gmail.com> wrote:
>
> That is more of a generalization.
>
> More precisely, the native VLAN is configured per trunk port, and the
> requirement is to have the native vlan consistent at the 2 ends of each
> trunk port rather than on all ports of the switch.
>
> Joseph.
>
> On 10/3/07, chidambaram sakthivel <sakthivelc@indiainfo.com> wrote:
> >
> > Hi Navid,
> >
> > I feel that both the switches should be configured for same native Vlan
> > either 1 or 2.
> > Because the untagged frames from sw1 Vlan1 will be forwarded to Vlan2 of
> > sw2, it will create
> > problems what you observe now.
> >
> > In Dot1Q encapsulation the native Vlan should be configured same on the
> > switches.
> >
> > Thanks,
> > Sakthivel.C
> >
> > > ----- Original Message -----
> > > From: xdsgrrr <xdsgrrr@consultcommerce.com>
> > > To: ccielab@groupstudy.com
> > > Subject: Re: 3550 why does vlan int go down
> > > Date: Tue, 02 Oct 2007 10:58:16 +0300
> > >
> > >
> > > Check with show interface trunk and see that evrything is ok with vlan
> > > 1 :)) and use show spanning-tree vlan 1 br to verify that port is in
> > > forwarding state for this vlan
> > > br,
> > > Atanas Yankov
> > > On Tue, 2007-09-25 at 11:26 +0200, Navid Daghighi wrote:
> > > > Hi,
> > > >
> > > > In this simple example, where I configured a mismatch native vlan :
> > > >
> > > > sw 1 : dot1Q, native vlan = 1
> > > > sw 2 : dot1Q, native vlan = 2
> > > >
> > > > SH IP INT BRIEF shows that :
> > > > fa0/x stays up/up
> > > > vlan1 goes up/down
> > > >
> > > > What is the logic behind this behavior ?
> > > > I would have expected the fa0/x to go up/down !
> > > >
> > > > Thanks,
> > > > Navid
> > > >
> > > >
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