Cisco Catalyst 4500 Series, Software Configuration Manual

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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 5 Configuring Virtual Switching Systems
In-Service Software Upgrade (ISSU) on a VSS
•
Aborting a Software Upgrade During ISSU, page 5-79
• Configuring the Rollback Timer to Safeguard Against Upgrade Issues, page 5-81
•
The ISSU Compatibility Matrix, page 5-82
Verifying the ISSU Software Installation
During the ISSU process, there are five valid states: disabled, init, load version, run version, and system
reset. Use the
show issu state command to obtain the current ISSU state:
•
Disabled state—The state for the standby supervisor engine while this supervisor engine is resetting.
•
Init state—The initial state for two supervisor engines, one active and one standby, before the ISSU
process is started. It is also the final state after the ISSU process completes.
•
Load version (LV) state—The standby supervisor engine is loaded with the new version of Cisco
IOS XE software.
• Run version (RV) state—The issu runversion command forces the switchover of the supervisor
engines. The newly active supervisor engine runs the new Cisco IOS XE software image.
•
While running ISSU, if both supervisor engines are reset (because of a power outage, for example),
the ISSU context is lost and the system returns to the Init state. Both supervisor engines return to
the old software.
You can verify the ISSU software upgrade by entering show commands to provide information on the
state of the during the ISSU process:
This example shows how to display the state and the current status of the supervisor engine during the
ISSU process:
Switch> enable
Switch# show issu state
Switch# show redundancy
Switch# show switch virtual
Verifying Redundancy Mode Before Beginning the ISSU Process
Before you begin the ISSU process, verify that the VSS is operating correctly; one supervisor engine
operates as the SSO Active and the peer supervisor engine in the other switch operating as the SSO Hot
Standby.
The following example displays verification that the system operating correctly as a VSS. Slot 1/1 (the
supervisor engine in slot 1 of Switch 1) is the active supervisor engine, and Slot 2/1 (the supervisor
engine in slot 1 of Switch 2) is the standby supervisor engine.
Command or Action Purpose
Step 1
Switch> enable
Enables privileged EXEC mode.
Enter your password if prompted.
Step 2
Switch# show issu state [ detail]
Displays the current state of the ISSU process.
Step 3
Switch# show redundancy
Displays current or historical status, mode, and related
redundancy information about the device.
Step 4
Switch# show switch virtual
Identifies which switch of the VSS is currently performing
the Active role, and which switch the Standby.