It's valid syntax on a 3550 or a 4506. See here though:

"If your switch only supports either ISL or 802.1q, this command does not
exist
because there is nothing to specify. This command only works when you can
choose between the two."
http://www.formortals.com/implementing-vlan-trunking/

Rich / ICN RTC7-Champaign

On Fri, Jul 16, 2010 at 3:45 PM, Daniel Zobel <[email protected]>wrote:

>  Another switch question.  Why can’t I put in “switchport trunk
> encapsulation dot1q” on a port?  The port is already a trunk port.  It gives
> me the little carrot under encapsulation tell me that it is invalid.  If I
> could I would go a physically put a cable in a new port to make this work,
> but I can’t access the room because of waxing.
>
>
>
> Dan
>
>
>
> Daniel Zobel
>
> Director of Technology
>
> Heyworth CUSD#4
>
> Direct Phone 309-473-2250
>
> Grade School 309-473-2822
>
> High School 309-473-2322
>
> Unit Office 309-473-3727
>
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