could anyone please tell me what is the easiest way to upgrade 3550 SMI (with in-line power) to EMI, i want to use it for my CCNP studies. i have another 3550 which has EMI installed.


Kamrul snipped-for-privacy@yahoo.com

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Hi Kamrul,

You may wish to investigate ordering Cisco Part Number:


EMI upgrade kit for standard versions of the Catalyst 3550-24, 3550-24 PWR, 3550-24-DC, 3550-24-FX, and 3550-48 switches, Provides advanced IP routing.

List Price: $1,995.00 USD

For competitive pricing on the Cisco Enhanced Multilayer Image upgrade for 3550 FE models you may wish to contact Reggie Grant directly at:

Reggie Grant U.S. Toll Free: 877-549-2680 International: 828-277-7272 Fax: 775-254-3558 AIM: R2MGrant Website:

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Brad Reese BradReese.Com Cisco Repair Service Experts

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Hendersonville Road, Suite 17 Asheville, North Carolina USA 28803 U.S. Toll Free: 877-549-2680 International: 828-277-7272

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you can copy the image "for testting purposes" from the EMI switch to a tftp-server..

and from the tftp server to the SMI switch..

in a production environment you need to buy the upgrade!



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Bernhard and Kamrul,

Cisco Systems has no policy that allows for the copy of a Catalyst 3550 Switch EMI image "for testing purposes."

To do so would be considered "software piracy" and Cisco Systems will not allow it.


There are two software images for the Catalyst 3550 switches - the Standard Multilayer Software Image (SMI) and the Enhanced Multilayer Software Image (EMI).

Catalyst 3550 switches that were purchased with the SMI preinstalled (WS-C3550-24-SMI, WS-C3550-48-SMI, WS-C3550-24PWR-SMI, WS-C3550-24-DC-SMI, and WS-C3550-24-FX-SMI) are only authorized to be upgraded to the most recent SMI.

If an enhancement to the EMI is desired, a software upgrade kit must be purchased before an authorized EMI software download.

The part number for the EMI software upgrade is CD-3550-EMI= .

If the Catalyst 3550 was purchased with the EMI preinstalled (WS-C3550-24-EMI, WS-C3550-48-EMI, and WS-C3550-24PWR-EMI), or CD-3550-EMI= has been purchased for the switch, then the downloading of the most recent EMI is authorized.

All Catalyst 3550-12T and 3550-12G switches have been shipped with the EMI and are authorized to be upgraded to the most recent EMI.

Downloads of the SMI and EMI files will be monitored for adherence to this authorization.

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Brad Reese

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And you've done this with the 3550 or newer models? You could play games like this back in the 3524/2924 days. The newer models have some magic cookie files set that you can't touch on the filesystem, and the IOS delivered is actually 100% byte-wise the same.

So, copy the IOS over, you'll still find it the same as before. Buy the license, follow its directions, and you'll be all set. There is no "student" discount.

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Doug McIntyre

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