Cisco Catalyst 4500 Series Zero-Downtime IOS Upgrade Process for Supervisor Engine 7-E, 7L-E, 6L-E and V-10GE Redundant Configurations

Learn to upgrade the Supervisor Engine IOS on Catalyst 4503-E, 4506-E, 4507R+E & 4510R+E. Perform Redundant Supervisor Engine IOS upgrade with zero service interruption (4507R/4510R Series only), force switchover to redundant Supervisor Engine and check status of your Supervisor Engines and line cards.
http://goo.gl/xMFdT