From: CCIE3000 (ccie3000@googlemail.com)
Date: Wed Jul 02 2008 - 07:40:06 ART
I covered this a couple of weeks ago.
If you just want control traffic going across the trunk then you don't need
to permit the native vlan on the trunk, the trunk will be fine.
If you are sending data over the native vlan then you need to permit it with
the trunk allowed command.
If you set up a mini lab you will see that the trunk is up and happy even
when it's native vlan is not in the trunk allowed command. But if you
configure SVI's on the switches (in the same vlan as your native) and don't
permit the vlan with the trunk allowed command you won't be able to ping
between the SVI's
On 7/2/08, Bhaskar Sivanesan <bas_bharath@yahoo.com> wrote:
>
> Hi Group
> In the following config in a switch
> int g1/1
> switchport trunk encap dot1q
> switchport mode trunk
> switchport trunk native vlan 200
> switchport trunk allowed vlan 10,20,30
> is it required that vlan 200 should also be added to the allowed vlan-list
> for packets in vlan 200 to get transmitted..
> thanks
> bhaskar
>
>
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