VLAN-support on 1721?

[frejac]

According to the feature navigator, my 1721 should support dot1q subinterfaces on my current IOS-build. For now, I'm at 12.3(2)XF advancedsecurity.

However - the command encapsulation dot1q doesnt work.

fw#conf t

Enter configuration commands, one per line. End with CNTL/Z.

fw(config)#int eth0.1

fw(config-subif)#encapsulation dot1q

^

% Invalid input detected at '^' marker.

fw(config-subif)#enca?

encapsulation

fw(config-subif)#encapsulation ?

% Unrecognized command

It recognizes the encapsulation command but nothing after that.

Isnt it supported on 1721, or do I need another feature-set? Or have I missed a command or so? :)

As I said, the feature-navigator told me that it should support this, but perhaps it's incorrect?

Thanks for helping

[mark-obrien · Accepted solution]

You probably need a fastethernet interface to run dot1q.

Mark

[frejac]

Ahhh, okey. Thanks.

[lgijssel]

Hello,

There are two things you need for this:

- You will need IP plus to facilitate VLAN trunking

- VLAN trunking only works on fast ethernet interfaces.

Regards,

Leo

[asiad]

VLAN trunking can also work on ethernet if you have certain IOS version like T train

Thanks,

Siad