From: Sergey Golovanov (sergey.golovanov@iementor.com)
Date: Thu Jan 18 2007 - 01:23:41 ART
John,
> Port *Vlans allowed on trunk
VLANs configured to be allowed on the trunk. If nothing is configured, then you should see default 1-4094 (or another range depending on the hardware platform). If you were to configure "switchport trunk allowed vlan 1-5", then your output would change to "1-5"
> Port *Vlans allowed and active in management domain
This reflects your actual vlans configured on the switches (in vtp). If you were to create vlans 2 and 3, then you should see 1-3 in the output. This output is not affected by forwarding/blocking states of the STP.
> Port Vlans in spanning tree forwarding state and not pruned
Same as the previous, but it reflects the STP state. If a specific vlan is blocked in STP, then it won't show up in this list (It's pruned from the trunk).
So for example, let's say you've configured "switchport trunk allowed vlan 1-10" on the trunk. You've only created vlans 2 and 5, and vlan 5 is blocked in STP on this trunk. You'd get similar output:
Cat3550#show interfaces trunk
Port Mode Encapsulation Status Native vlan
Gi0/1 desirable 802.1q trunking 1
Port *Vlans allowed on trunk
Gi0/1 1-10
Port *Vlans allowed and active in management domain
Gi0/1 1,2,5
Port Vlans in spanning tree forwarding state and not pruned
Gi0/1 1,2
--------------------------------------------------------------------
Sergey Golovanov, CCIEx5 (R&S/Security/Voice/Service Provider/Storage)
"Please, don't ask me for my ccie #, there are reasons why I can't release it"
ieMentor Instructor and Content Developer
sergey.golovanov@iementor.com
http://www.iementor.com
> -------Original Message-------
> From: John Jones <acer0001@gmail.com>
> Subject: show interface trunk output
> Sent: Jan 17 '07 21:00
>
> I'm going through the VLAN stuff as a refresher and was wondering what the
> defeinition of the "Vlans allowed on trunk" and "Vlans allowed and active in
> management domain" are as shown in the "show interface trunk" output on the
> Cat3550. I figured that the latter was the VLANs configured manually for the
> interface, but does the the first mean VLANs that the switch supports?
>
> Cat3550#show interfaces trunk
>
> Port Mode Encapsulation Status Native vlan
> Gi0/1 desirable 802.1q trunking 1
> Gi0/2 desirable 802.1q trunking 1
>
> Port *Vlans allowed on trunk
> *Gi0/1 1-4094
> Gi0/2 1-4094
>
> Port *Vlans allowed and active in management domain
> *Gi0/1 1-3,10
> Gi0/2 1-3,10
>
> Port Vlans in spanning tree forwarding state and not pruned
>
> Gi0/1 1-3,10
> Gi0/2 1-3,10
>
>
> Thanks.
>
> John
>
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