WHich is the best IOS upgrade on the c3550 running IOS ver c3550-i5q3l2-mz.121-22.EA10b.bin?

Hi,

Check out the below link for ios upgrade procedure for 3550 switches

http://www.cisco.com/en/US/products/hw/switches/ps646/products_configuration_example09186a0080169623.shtml

and with your network environment with having in mind about the application perfromance,lots of featuire differe from ios to ios.so i would suggest if you dont face any problem with existing one don't go for upgrade if it is necessary.

Hope to Help !!

Ganesh.H

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