Re: dot1q tag native & sh int switchport

Well, native vlan tagging is administratively disabled, but it still shows
up as enabled in the sh int switchport. Also, there no operational status
entry. Lastly, native vlan tagging isn't negotiated so there would be no
reason for the operational and administrative modes to differ.

RSRack1SW1#sh vlan dot1q tag native
dot1q native vlan tagging is disabled

RSRack1SW1#sh int g0/13 sw
RSRack1SW1#sh int g0/13 switchport
Name: Gi0/13
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 46 (VLAN_46)
Administrative Native VLAN tagging: enabled

Re: dot1q tag native & sh int switchport

Alexei Monastyrnyi
to:
Keegan.Holley
07/14/09 08:38 PM

Cc:
Group study
Please respond to alexeim73

I think "Administrative" means the state the port was administered to be
or start from by configuration commands, Some one can probably correct
me on that.

Like in this quick example below.

Fa0/1 is configured for switcport mode "dynamic desirable" and there is
no such thing for operational mode, it would be either trunk or access
port. So here we go, observing how Administrative Mode changes as we
change a switchport configuration.

SW1#sh run in fa 0/1
Building configuration...

Current configuration : 105 bytes
!
interface FastEthernet0/1
 description R1 eth 0/0
 switchport mode dynamic desirable
 duplex full
end

SW1#sh inter fa 0/1 swi
Name: Fa0/1
Switchport: Enabled
Administrative Mode: dynamic desirable
Operational Mode: static access
[...]

SW1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
SW1(config)#in fa 0/1
SW1(config-if)#sw mode acc
SW1(config-if)#do sh run in fa 0/1
Building configuration...

Current configuration : 94 bytes
!
interface FastEthernet0/1
 description R1 eth 0/0
 switchport mode access
 duplex full
end

SW1(config-if)#do sh int fa 0/1 swi
Name: Fa0/1
Switchport: Enabled
Administrative Mode: static access
Operational Mode: static access
[...]

I think for tagging native VLAN "Operational Mode" is just missing for
whatever reason. Might be interesting to file it as a fix request for
the show command to TAC. :-)

HTH
A.

Keegan.Holley_at_sungard.com wrote:
>
> Any idea what it does mean?
>
> Thanks for answering,
>
> Keegan
>
>
>
>
>
> *Re: dot1q tag native & sh int switchport*
>
>
> *Alexei Monastyrnyi * to: Keegan.Holley
> 07/14/09 07:20 PM
>
>
> *Please respond to alexeim73*
>
>
>
>
> ------------------------------------------------------------------------
>
>
>
> Hi.
> It doesn't really mean operational status of the switch-port for dot1q
> native vlan tagging. On some platforms (like 6500) there is actually
> "Operational Native VLAN Tagging: ... " line in "show interface
> switchport" output which changes according to "vlan dot tag native"
> presence in the ocnfig. So you'd better trust "show vlan dot tag antive"
> output.
>
> HTH
> A.
>
> Keegan.Holley_at_sungard.com wrote:
> >
> > No, acutally.
> >
> >
> >
> > *Re: dot1q tag native & sh int switchport*
> >
> >
> > *Alexei Monastyrnyi * to:
> Keegan.Holley
> > 07/13/09 10:32 PM
> >
> >
> > *Please respond to alexeim73*
> >
> >
> >
> >
> >
------------------------------------------------------------------------
> >
> >
> >
> > haven't you got my replay mate/?
> >
> > Keegan.Holley_at_sungard.com wrote:
> > > Sorry for the repost. Just wondering if no one saw it or no one
> > knows the
> > > answer.
> > >
> > >
> > >
> > >
> > >
> > >
> > > dot1q tag native & sh int switchport
> > >
> > > Keegan.Holley
> > > to:
> > > Cisco certification
> > > 07/12/09 11:33 PM
> > >
> > >
> > > Sent by:
> > > nobody_at_groupstudy.com
> > > Please respond to Keegan.Holley
> > >
> > >
> > >
> > >
> > >
> > >
> > > Does anyone know what the Administrative native vlan tagging line
> > means in
> > >
> > > the show int switchport? It always says enabled even when native
vlan
> > > tagging is off.
> > >
> > > RSRack1SW2(config)#do sh int g0/16 swi
> > > Name: Gi0/16
> > > Switchport: Enabled
> > > Administrative Mode: trunk
> > > Operational Mode: trunk
> > > Administrative Trunking Encapsulation: dot1q
> > > Operational Trunking Encapsulation: dot1q
> > > Negotiation of Trunking: On
> > > Access Mode VLAN: 1 (default)
> > > Trunking Native Mode VLAN: 46 (VLAN_46)
> > > Administrative Native VLAN tagging: enabled
> > > Voice VLAN: none
> > >
> > >
> > > RSRack1SW2(config)#do sh vlan dot tag native
> > > dot1q native vlan tagging is disabled
> > > RSRack1SW2(config)#
> > >
> > >
> > > Blogs and organic groups at http://www.ccie.net
> > >
> > >
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Received on Tue Jul 14 2009 - 21:26:28 ART