Cisco Cisco IOS Software Release 12.2(55)SE

© 2015 Cisco Systems, Inc. All rights reserved.

Cisco IOS Release 12.2(55)SE and later runs on Catalyst 3750-X, Catalyst 3750-E, Catalyst 3650-X, 
and Catalyst 3560-E switches and on Cisco enhanced EtherSwitch service modules.

The Catalyst 3750-X and 3750-E switches support stacking through Cisco StackWise Plus technology. 
The Catalyst 3750-X also supports StackPower. The Catalyst 3560-X switches, Catalyst 3650-E 
switches, and the Cisco enhanced EtherSwitch service modules do not support switch stacking. 

Unless otherwise noted, the term switch refers to a standalone switch and to a switch stack. Cisco 
enhanced EtherSwitch service modules and Catalyst 3560-E switches support the same features.

For more information, see the 

 and the 

These release notes include important information about Cisco IOS Release 12.2(55)SE and later, and 
any limitations, restrictions, and caveats that apply to the releases. Verify that these release notes are 
correct for your switch:

If you are installing a new switch, see the Cisco IOS release label on the rear panel of your switch.

If your switch is on, use the show version privileged EXEC command. See the 

If you are upgrading to a new release, see the software upgrade filename for the software version. 
See the 

http://www.cisco.com/cisco/web/download/index.html

Upgrading the software image on a Catalyst 3560-X or 3750-X switch from Cisco IOS Release 
12.2(53)SE2 to Cisco IOS Release 12.2(55)SE or 12.2(55)SE1, or upgrading from Cisco IOS Release 
12.2(55)SE to 12.2(55)SE1, could take up to 20 minutes.