How To Perform The Issu Process - Cisco Catalyst 4500 Series Software Configuration Manual

How to Perform the ISSU Process

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How to Perform the ISSU Process
Unlike SSO, which is a mode of operation for the device and a prerequisite for performing ISSU, the
ISSU process is a series of steps performed while the switch is in operation. The steps result in an
upgrade to new or modified Cisco IOS XE software, and have a minimal impact to traffic.
For an illustration of the process flow for ISSU, refer to
Note
This section includes the following topics:
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Upgrading ISSU to Cisco IOS XE 3.4.0SG/15.1(2)SG from a Prior Release
Because images prior to Cisco IOS XE 3.4.0SG/15.1(2)SG use the earlier CLI format and Cisco IOS XE
3.4.0SG and 15.1(2)SG images use a newer CLI format, your upgrade consists of the following:
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A configuration like the following should exist on pre-Cisco IOS XE 3.4.0SG/15.1(2)SG image:
ip vrf mgmtVrf
!
interface FastEthernet1
ip vrf forwarding mgmtVrf
ip address 10.1.1.1 255.255.255.0
speed auto
duplex auto
ipv6 address 2000::1/64
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
8-16
Compare two IOS XE software images and understand the compatibility level of the software
images (that is, compatible, base-level compatible, and incompatible), or dynamically determined.
Compare two software images and see the client compatibility for each ISSU client.
Provide links to release notes for the software image.
Upgrading ISSU to Cisco IOS XE 3.4.0SG/15.1(2)SG from a Prior Release, page 8-16
Downgrading ISSU from Cisco IOS XE 3.4.0SG/15.1(2)SG to a Prior Release, page 8-18
Verifying the ISSU Software Installation, page 8-19
Loading New Cisco IOS XE Software on the Standby Supervisor Engine, page 8-21
Switching to the Standby Supervisor Engine, page 8-25
Stopping the ISSU Rollback Timer (Optional), page 8-27
Loading New Cisco IOS XE Software on the New Standby Supervisor Engine, page 8-28
Using changeversion to Automate an ISSU Upgrade, page 8-30
Aborting a Software Upgrade During ISSU, page 8-36
Configuring the Rollback Timer to Safeguard Against Upgrade Issues, page 8-37
Displaying ISSU Compatibility Matrix Information, page 8-39
Upgrading the image on your switch to Cisco IOS XE 3.4.0SG/15.1(2)SG.
Upgrading mgmtVrf from the earlier CLI format to the later format, removing any IPv6 addresses
on the interface.
Enabling IPv6 address family under mgmtVrf, and reconfigure IPv6 addresses on fa1.
Chapter 8 Configuring the Cisco IOS XE In Service Software Upgrade Process
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