No "encapsulation" command on IOS 12.2(12a) ??

Show Version: Cisco Internetwork Operating System Software IOS (tm) 3600 Software (C3620-I-M), Version 12.2(12a), RELEASE SOFTWARE (fc1) flash image: System image file is "flash:c3620-i-mz.122-12a.bin" I'm trying to configure a FastEthernet sub interface for 802.1q VLANs, but theres no encapsulation command. I've googled it up for about 2 hours and have come up with nothing... the following command sequence is documented dozens of times: As shown on: http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120... interface fastethernet slot/port.subinterface-number encapsulation dot1q vlanid Any help would be appreciated.