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Subinterface encapsulation on Cisco 2651 Router

Last Modified: 2012-08-13
I am setting up my home lab for VLAN routing and I wish to configure a subinterface on my 2651 router.

 It does have 2 10/100 FE ports.

I am able to created the sub interface (using INTERFACE FA0/1.10 command) but when I go to set the encapsulation is says that command is not recognized.  Below is a SHO VER and error messages.
R1(config-if)#do sho ver
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-I-M), Version 12.3(6a), RELEASE SOFTWARE (fc4)
Copyright (c) 1986-2004 by cisco Systems, Inc.
Compiled Fri 02-Apr-04 19:17 by kellythw
Image text-base: 0x80008098, data-base: 0x80C83D68
ROM: System Bootstrap, Version 12.1(3r)T2, RELEASE SOFTWARE (fc1)
R1 uptime is 46 minutes
System returned to ROM by power-on
System image file is "flash:c2600-i-mz.123-6a.bin"
cisco 2651 (MPC860P) processor (revision 0x200) with 126976K/4096K bytes of memory.
Processor board ID JAB05380CRG (3611485969)
M860 processor: part number 5, mask 2
Bridging software.
X.25 software, Version 3.0.0.
2 FastEthernet/IEEE 802.3 interface(s)
1 Serial network interface(s)
32K bytes of non-volatile configuration memory.
16384K bytes of processor board System flash (Read/Write)
Configuration register is 0x2102
R1(config)#interface fa0/1.10
R1(config-subif)# encapsulation
% Invalid input detected at '^' marker.
R1(config-subif)#ip address
% Configuring IP routing on a LAN subinterface is only allowed if that
subinterface is already configured as part of an IEEE 802.10, IEEE 802.1Q,
or ISL vLAN.

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