From: De Witt, Duane (duane.dewitt@siemens.com)
Date: Wed Oct 12 2005 - 15:03:39 GMT-3
Correct me if I'm wrong, but to my knowledge this command adds a tag to
the native VLAN, it doesn't cause the native VLAN to cease to exist?
Below output shows that even with the native vlan tagged, it is still
defined as a native VLAN:
Rack1SW1#show int fastEthernet 0/13 trunk
Port Mode Encapsulation Status Native vlan
Fa0/13 desirable 802.1q trunking 1
Port Vlans allowed on trunk
Fa0/13 1-4094
Port Vlans allowed and active in management domain
Fa0/13 1,3-5,7,17,23,28,38,56
Port Vlans in spanning tree forwarding state and not pruned
Fa0/13 1,4,23,28,38,56
Rack1SW1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Rack1SW1(config)#vl
Rack1SW1(config)#vlan do
Rack1SW1(config)#vlan dot1q t
Rack1SW1(config)#vlan dot1q tag n
Rack1SW1(config)#vlan dot1q tag native
Rack1SW1(config)#^Z
Rack1SW1#conf t
09:44:49: %SYS-5-CONFIG_I: Configured from console by console
Rack1SW1#show int fastEthernet 0/13 trunk
Port Mode Encapsulation Status Native vlan
Fa0/13 desirable 802.1q trunking 1
Port Vlans allowed on trunk
Fa0/13 1-4094
Port Vlans allowed and active in management domain
Fa0/13 1,3-5,7,17,23,28,38,56
Port Vlans in spanning tree forwarding state and not pruned
Fa0/13 1,4,23,28,38,56
Rack1SW1#
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Ivan
Sent: 12 October 2005 07:57 PM
To: ccielab@groupstudy.com
Subject: Re: DOT1Q NATIVE VLAN STANDARD or NON-STANDARD
native vlan also can be tagged
vlan dot1q tag native
> be changed to make any VLAN native which simply means it will not
carry
> a VLAN tag in the header. Bottom line is that there is always a native
> VLAN in Dot1Q, whether you define it or not.
>
> Does that answer your question?
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Ed Lui
> Sent: 12 October 2005 06:03 PM
> To: ccielab@groupstudy.com
> Subject: DOT1Q NATIVE VLAN STANDARD or NON-STANDARD
>
> Hi group,
> I have no luck finding out why we need native vlan in dot1q. I
> understand
> that native vlan should be defined on a trunk port. I came across a
> router
> on a stick lab scenario, which I did not define the native vlan and it
> is
> still working fine. Read through the dot1q standard on
> ieee.org<http://ieee.org>but still can not figure out my question.
> So, what is the difference between having a native and not having a
> native
> vlan defined ? The only thing I can think of is, tagged frame can
carry
> QoS
> information. Other than that, what is the benefit or difference
between
> tagged and untagged frames ? Why define a native ?
>
> Thanks in advance for any help or hint,
>
> Ed Lui
>
>
> TRUNK W/O NATIVE VLAN
> 2621=============================3550
>
>
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