>Это зависит не от IOS, а от железки. sh ver?
#show hardware
Cisco Internetwork Operating System Software
IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(12c)EA1, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Sun 24-Nov-02 23:31 by antonino
Image text-base: 0x80010000, data-base: 0x80562000
ROM: Bootstrap program is CALHOUN boot loader
cisco uptime is 33 weeks, 5 days, 2 minutes
System returned to ROM by power-on
System restarted at 12:50:45 MSD Wed May 25 2005
System image file is "flash:/c2950-i6q4l2-mz.121-12c.EA1.bin"
cisco WS-C2950-24 (RC32300) processor (revision H0) with 21002K bytes of memory.
Processor board ID FHK0708X0UF
Last reset from system-reset
Running Standard Image
24 FastEthernet/IEEE 802.3 interface(s)
32K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address: 00:0C:30:86:05:40
Motherboard assembly number: 73-5781-11
Power supply part number: 34-0965-01
Motherboard serial number: FOC07080KUX
Power supply serial number: DAB0704154V
Model revision number: H0
Motherboard revision number: A0
Model number: WS-C2950-24
System serial number: FHK0708X0UF
Configuration register is 0xF