You would want to do this.

CAT 6
interface FastEthernet0/0.56
encapsulation dot1Q 76
ip address 140.10.56.6 255.255.255.0
!
interface FastEthernet0/0.76
encapsulation dot1Q 76
ip address 140.10.76.6 255.255.255.0
CAT 2
vlan dot1q tag native

interface FastEthernet0/6
 switchport trunk encap dot1q
 switchport mode trunk
 switchport trunk allowed vlan 56,76
!
interface Vlan56
 ip address 140.10.56.12 255.255.255.0
!
interface Vlan76
 ip address 140.10.76.12 255.255.255.0
On Tue, Feb 22, 2011 at 1:31 PM, Daniel Gheorghe
<[email protected]>wrote:

> The behavior is the same if the Cat port is dynamic or not. The strange
> thing is that the 56 vlan has connectivity if I remove the voice vlan from
> the port. I can't understand this.
>
> The restrictions of the task include all the vlans being tagged (so vlan
> dot1g tag native) and only the port-channels between the switches should be
> seen as trunks, So the ideea of the voice vlan appeared in order to avoid
> using a trunk on Cat2 fa0/6.
>
> Also I confirm that the behavior is the same even if we use 2 subinterfaces
> on the router (although the task prohibits the modification of the router
> interface addressing).
>
> On Tue, Feb 22, 2011 at 10:24 AM, marc abel <[email protected]> wrote:
>
> > Actually from your output you are set to dynamic on f0/6 so it probably
> is
> > trunking. Can you confirm? If so you can either set the native vlan to 56
> on
> > the the trunk, or change the router side to a sub-interface as I
> suggested
> > before.
> >
> >
> >
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