Cisco Catalyst 4500 Series Software Configuration Guide

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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 8 Configuring the Cisco IOS XE In Service Software Upgrade Process
How to Perform the ISSU Process
Prerequisites
• Ensure that the new version of Cisco IOS XE software image is already present in the file system of
both the active and standby supervisor engines. Also ensure that appropriate boot parameters
(BOOT string and config-register) are set for the active and standby supervisor engines.
Note auto-boot must be enabled for ISSU to succeed.
• Optionally, perform additional tests and commands to determine the current state of peers and
interfaces for later comparison.
• Ensure the system (both active and standby supervisor engines) is in SSO redundancy mode. If the
system is in RPR mode, you can still upgrade the system using the ISSU CLI commands, but the
system will experience extended packet loss during the upgrade.'
Refer to the Stateful Switchover document for more details on how to configure SSO mode on
supervisor engines.
• For ISSU to function, the IOS XE file names on the active and standby supervisor engines must
match.
Perform the following steps at the active supervisor engine:
Command or Action Purpose
Step 1
Switch> enable
Enables privileged EXEC mode.
Enter your password if prompted.
Step 2
Switch# issu loadversion [active-slot]
active-image-new [standby-slot]
standby-image-new [forced]
Starts the ISSU process and (optionally) overrides the
automatic rollback when the new Cisco IOS XE software
version is detected to be incompatible.
It may take several minutes after entering the issu
loadversion command for Cisco IOS XE software to load
onto the standby supervisor engine and for the standby
supervisor engine to transition to SSO mode. This causes
the standby supervisor engine to reload with the new
software image.
If you use the forced option, the standby supervisor engine
is booted with the new software image. After the software
image is loaded on the standby supervisor engine, if the
software image is incompatible, the system is forced to the
RPR mode. Otherwise the system will continue in the SSO
mode.

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E