CHAPTER
8-1
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
8
Configuring the Cisco IOS XE In Service Software
Upgrade Process
Note An ISSU upgrade from any release prior to IOS XE 3.6.0E to 3.6.0E or later is unsupported for IOS XE
supervisor engines (SUP7-E, SUP7L-E and SUP8-E).
Note Refer to Chapter 5, “Configuring Virtual Switching Systems”for details on VSS ISSU.
Note ISSU is available in Cisco IOS XE Release 3.1.0.SG and later releases.
Operating on redundant systems, the In Service Software Upgrade (ISSU) process allows Cisco IOS XE
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 XE software to
be upgraded while packet forwarding continues. This increases network availability and reduces
downtime caused by planned software upgrades. This document provides information about ISSU
concepts and describes the steps taken to perform ISSU in a system.
Topics include:
• Prerequisites to Performing ISSU, page 8-2
• About Performing ISSU, page 8-3
• How to Perform the ISSU Process, page 8-16
• Cisco High Availability Features in Cisco IOS XE 3.1.0SG, page 8-41
Note For complete syntax and usage information for the switch commands used in this chapter, see the
Cisco IOS Command Reference Guides for the Catalyst 4500 Series Switch.
If a command is not in the Cisco Catalyst 4500 Series Switch Command Reference , you can locate it in
the Cisco IOS Master Command List, All Releases.
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