show version command

The exec mode show version command displays information about the device, such as:

  • the IOS version running on the device
  • number of interfaces
  • device model
  • time of the last reboot
  • amount of memory available on the device


Here is an example output of this command executed on a Cisco Catalyst 2960 series switch:

SW1#show version 
Cisco IOS Software, C2960 Software (C2960-LANBASEK9-M), Version 15.0(2)SE4, RELEASE SOFTWARE (fc1)
Technical Support:
Copyright (c) 1986-2013 by Cisco Systems, Inc.
Compiled Wed 26-Jun-13 02:49 by mnguyen

ROM: Bootstrap program is C2960 boot loader
BOOTLDR: C2960 Boot Loader (C2960-HBOOT-M) Version 12.2(25r)FX, RELEASE SOFTWARE (fc4)

Switch uptime is 39 minutes
System returned to ROM by power-on
System image file is "flash:c2960-lanbasek9-mz.150-2.SE4.bin"

This product contains cryptographic features and is subject to United

cisco WS-C2960-24TT-L (PowerPC405) processor (revision B0) with 65536K bytes of memory.
Processor board ID FOC1010X104
Last reset from power-on
1 Virtual Ethernet interface
24 FastEthernet interfaces
2 Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.

64K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address : 00:17:59:A7:51:80
Motherboard assembly number : 73-10390-03
Power supply part number : 341-0097-02
Motherboard serial number : FOC10093R12
Power supply serial number : AZS1007032H
Model revision number : B0
Motherboard revision number : B0
Model number : WS-C2960-24TT-L
System serial number : FOC1010X104
Top Assembly Part Number : 800-27221-02
Top Assembly Revision Number : A0
Version ID : V02
CLEI Code Number : COM3L00BRA
Hardware Board Revision Number : 0x01

Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 26 WS-C2960-24TT-L 15.0(2)SE4 C2960-LANBASEK9-M

Configuration register is 0xF

As you can see from the output above, this command gives us detailed information about the IOS device. Here is a brief description of the most important information:

  • Version 15.0(2)SE4 – the IOS version that the device is running
  • Switch uptime is 39 minutes – the uptime of the device
  • System returned to ROM by power-on – the reason for the last reload of the device (e.g. whether the device was reloaded using the reload command, powered off and on…)
  • System image file is “flash:c2960-lanbasek9-mz.150-2.SE4.bin” – the image file of the running IOS
  • cisco WS-C2960-24TT-L (PowerPC405) processor – CPU type
  • 24 FastEthernet interfaces, 2 Gigabit Ethernet interfaces – physical interfaces on the device
  • Configuration register is 0xF – the configuration register setting that defines which IOS software and configuration file to load.