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Naming Convention of Cisco IOS Image Files

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IOS is the Operating System software used on Cisco routers and current Cisco Network Switches.Cisco IOS (Internetwork Operating System) image file is normally stored in flash memory and it has a naming convention.

Following output shows the "show-flash" command from privileged mode.

OmniSecu03#show flash
System flash directory:
  File  Length   Name/status
  3   5571584  c2600-i-mz.122-28.bin
  2   28282    sigdef-category.xml
  1   227537   sigdef-default.xml
[5827403 bytes used, 58188981 available, 64016384 total]
63488K bytes of processor board System flash (Read/Write)

The name of the Cisco IOS (Internetwork Operating System) file is c2600-i-mz.122-28.bin.

• The "c2600" means that this IOS image is for a 2600 series router. Other values which may appear here for different router platforms are listed below.

c1005 – For 1005 platform

c1600 – For 1600 platform

c1700 – For 1700 series platforms

c2500 – For 2500 series platforms

c2800 – For 2800 series platform

c2900 – For 2900 series platforms

c3620 – For 3620 platform

c3640 – For 3640 platform

c4000 – For 4000 series platform

c4500 – For 4500 and 4700 platforms

• The "i" indicates  that this is the IP routing version of the IOS.

Normal values which may appear here are

a - appn

a2 – atm

a3 – SNA switching

b – appletalk

c – communications servers etc

i – ip

j – enterprise

l – IPX

n – Novell

o – firewall

p – service provider

v – voice

• The "mz" indicates that this version of the IOS runs from RAM and the IOS file is compressed.

• The "122-28" indicates that this is IOS version 12.2, patch level 28.

              Jajish Thomason Google+
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