[c-nsp] Subinterfaces on a 6500 Native?

[Deepak Jain]

What is the minimum software rev for a 6500/7600 running IOS Native to 
support (dot) or Subinterfaces for L3 VLAN encapsulation?

6500(config)#int g2/12
6500(config-if)#int g2/12.200
                             ^
% Invalid input detected at '^' marker.

6500(config)#encap ?
% Unrecognized command

The software rev is:

Cisco Internetwork Operating System Software
IOS (tm) c6sup2_rp Software (c6sup2_rp-PSV-M), Version 12.1(22)E6, 
RELEASE SOFTWARE (fc1) which I was pretty supported it unless I am 
missing something obvious.

interface GigabitEthernet2/12
  ip address 192.168.0.1 255.255.255.252
  shutdown
!

Thanks in advance,

Deepak