Cisco Catalyst 4500 Series Software Configuration Guide

5-64
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 5 Configuring Virtual Switching Systems
In-Service Software Upgrade (ISSU) on a VSS
possible. The matrix entry designates the images to be incompatible (I). The system operates in RPR
mode during the upgrade process when the versions of Cisco IOS XE at the active and standby
supervisor engines are incompatible.
• Cisco IOS XE determines the compatibility between the active and the standby IOS XE software
dynamically during Standby boot up. The matrix is represented by “x”.
To display the compatibility matrix data between two software versions on a given system, enter the
show issu comp-matrix stored command.
Note This command is useful only for verification purposes because it is available only after the ISSU process
has started. You might want to check the compatibility matrix prior to starting ISSU. Use the Feature
Navigator to obtain the needed information:
http://tools.cisco.com/ITDIT/CFN/jsp/index.jsp
Compatibility Verification Using Cisco Feature Navigator
The ISSU application on Cisco Feature Navigator allows you to:
• Select a specific software bundle.
• Identify which software images are compatible with the selected software image.
• 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.
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.
Note For an illustration of the process flow for ISSU, refer to Figure 5-11.
This section includes the following topics:
• Verifying the ISSU Software Installation, page 5-65
• Verifying Redundancy Mode Before Beginning the ISSU Process, page 5-65
• Verifying the ISSU State Before Beginning the ISSU Process, page 5-67
• ISSU using the Four-command Sequence: Step 1 (loadversion), page 5-68
• ISSU using the Four-command Sequence: Step 2 (runversion), page 5-70
• ISSU using the Four Command Sequence: Step 3 (acceptversion), page 5-72
• ISSU using the Four Command Sequence: Step 4 (commitversion), page 5-72
• Using changeversion to Automate an ISSU Upgrade, page 5-73

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