Ethernet running at 100mb *is* FastEthernet.
For the 2620s and 2621s you need to run IOS with
"plus" feature set.

--- Michael Everett <[EMAIL PROTECTED]>
wrote:
> In my lab at work I have 2 2924xl switches, 1
> cat5509, and a Cisco 2600
> router with a 10/100 ethernet port.  The router will
> not enable me to enter
> an encapsulation command on the ethernet interface. 
> Is ISL not an option on
> plan old 10/100 ethernet?  Will it only work on a
> fast ethernet interface?
> Dumb question, what is the functional difference
> between an ethernet
> interface configured to run at 100m full duplex and
> a fast ethernet
> interface?  If you wish to respond to me directly
> please send replies to,
> [EMAIL PROTECTED]
> 
> Thanks Mike
> 
> 
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