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Community Member

3550 Switch IOS

I have a couple of questions about the IOS on a Cat 3550.

1. How can you tell if the switch is running EMI or SMI? The partial sh ver output is below

Cisco Internetwork Operating System Software

IOS (tm) C3550 Software (C3550-I5Q3L2-M), Version 12.1(22)EA4, RELEASE SOFTWARE (fc1)

Copyright (c) 1986-2005 by cisco Systems, Inc.

Compiled Wed 23-Mar-05 17:16 by yenanh

Image text-base: 0x00003000, data-base: 0x00841750

ROM: Bootstrap program is C3550 boot loader

sw-3550-01 uptime is 34 minutes

System returned to ROM by power-on

System image file is "flash:/c3550-i5q3l2-mz.121-22.EA4/c3550-i5q3l2-mz.121-22.EA4.bin"

cisco WS-C3550-24 (PowerPC) processor (revision R0) with 65526K/8192K bytes of memory.

Processor board ID CAT0937N0JY

Last reset from warm-reset

Bridging software.

Running Layer2/3 Switching Image

2. In looking for the latest IOS, I found that the EMI IOS appears to have stopped at 12.2.22EA6. The newer versions appear to be labelled IP Base and IP Services. I've been looking for a document that explains what is happening but have drawn a blank.


Cisco Employee

Re: 3550 Switch IOS

1)You are running EMI. "i5q3l2" is EMI while "i9q3l2" is SMI.

2)Due to change in cross product naming convention, newer IOS has IP base and IP services feature set rather than SMI/EMI. IP Base corresponds to SMI while IP services corresponds to EMI. The release notes should help.

Community Member

Re: 3550 Switch IOS

So the latest IOS Image for the 3550 is 12.2(25)SED ?


I thought this may have been the case with the IP Services vs EMI. However, when I went into Software Advisor and compared the IP Services features to the EMI Features in the version I am running, 12.1(22)EA4, the EMI version had many unique features.

Is this because it's 12.1 vs 12.2 ?

Cisco Employee

Re: 3550 Switch IOS

12.2(25)SED is the latest at this time. Software advisor doesnt work very well with Catalysts. I would say all features in 12.1 are in 12.2 and more.

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