From: Rich Collins (nilsi2002@gmail.com)
Date: Fri Oct 05 2007 - 12:01:38 ART
That was a good pointer.
So a good method is to run "show spanning-tree inconsistentports"
Switch2#sh spanning-tree inconsistentports
Name Interface Inconsistency
-------------------- ---------------------- ------------------
VLAN0001 GigabitEthernet0/19 Port VLAN ID Mismatch
VLAN0601 GigabitEthernet0/19 Port VLAN ID Mismatch
VTP will also show the remote "native vlan"
Device ID: SUP720
Entry address(es):
IP address: 10.90.0.1
Platform: cisco CISCO7613, Capabilities: Router Switch IGMP
Interface: GigabitEthernet0/19, Port ID (outgoing port):
GigabitEthernet9/37
Holdtime : 140 sec
Version :
Cisco Internetwork Operating System Software
IOS (tm) s72033_rp Software (s72033_rp-ADVENTERPRISEK9_WAN-M), Version
12.2(18)SXF8,
RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2007 by cisco Systems, Inc.
Compiled Sat 03-Mar-07 00:31 by tinhuang
advertisement version: 2
VTP Management Domain: ''
Native VLAN: 601
Duplex: half
On 10/3/07, Joseph Brunner <joe@affirmedsystems.com> wrote:
>
> Look for the PVID inconsistency messages...
>
> Read this document...
>
>
> http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a0080
> 1d11a0.shtml
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Rich
> Collins
> Sent: Wednesday, October 03, 2007 4:45 PM
> To: Joseph Saad
> Cc: chidambaram sakthivel; ccielab@groupstudy.com
> Subject: Re: 3550 why does vlan int go down
>
> 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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