Cisco Cisco IOS Software Release 12.2(33)SRE

© 2007 Cisco Systems, Inc. All rights reserved.

The ISSU—HSRP feature enables support for ISSU in HSRP.

The In Service Software Upgrade (ISSU) process allows Cisco IOS software to be updated or otherwise 
modified while packet forwarding continues. In most networks, planned software upgrades are a 
significant cause of downtime. ISSU allows Cisco IOS software to be modified while packet forwarding 
continues, which increases network availability and reduces downtime caused by planned software 
upgrades. 

For detailed information about ISSU, see the Cisco IOS In Service Software Upgrade Process document at 
the following URL: 

For detailed information about ISSU on the 7600 series routers, see the ISSU and eFSU on Cisco 7600 
Series Routers document at the following URL:

For detailed information about ISSU on Cisco Catalyst 4500 series switches, see the

chapter of the

, Release 12.2(31)SGA.

Cisco IOS master commands lists provide an alphabetical list of all Cisco IOS commands in a Cisco IOS 
release.

Cisco IOS new, modified, removed, and replaced commands lists provide an alphabetized list of all new, 
modified, removed, and replaced commands in a Cisco IOS release.

Cisco IOS Master Commands List, Release 12.2SR, at the following URL: