Cisco Catalyst 4500 Series, Software Configuration Manual

Page: 429 / 2086

8-31
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
•
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 (refer to
Chapter 10, “Configuring Supervisor Engine Redundancy Using RPR
and SSO on Supervisor Engine 6-E and Supervisor Engine 6L-E” ).
•
For ISSU to function, the IOS XE software image file names on the active and standby supervisor
engines must match.
Perform the following steps at the active supervisor engine:
This example shows how to initiate an ISSU upgrade process using the issu changeversion command on
slot number 5, the slot for the current active supervisor engine. The show issu state detail and show
redundancy command output is included to show the supervisor state before and after the upgrade
procedure.
Note The success messages included in the output below is displayed after some delay because the ISSU
upgrade procedure progresses through the ISSU states.
Command or Action Purpose
Step 1
Switch> enable
Enables privileged EXEC mode.
Enter your password if prompted.
Step 2
Switch# issu changeversion [ active-slot
active-image-new ]] [ standby-slot
[ standby-image-new ]] [ at hh:mm | in hh:mm ]
[ quick ]
Initiates a single-step complete upgrade process cycle.
Performs the logic of the four standard commands (issu
loadversion, issu runversion, issu acceptversion, and issu
commitversion) without user intervention.
active-slot— Defines the active slot number.
new-image— Specifies IOS XE image URL to be upgraded
to.
standby-slot— Defines the standby slot number.
standby-image—Specifies the standby IOS XE image URL.
at hh:mm— Schedules an ISSU upgrade to begin in the future.
Provides an exact time ( hh : mm , 24 hour format) in the next 24
hours when the upgrade will occur.
in hh:mm— Schedules an ISSU upgrade to begin in the
future. Provides the number of hours and minutes ( hh : mm
format) that will elapse before an upgrade will occur (99:59
max).
quick —Upon switchover, boots the standby supervisor
engine with the new, rather than old, image for faster
upgrade.
Step 3
Switch# show issu state [ detail ]
Displays the state of the during the ISSU process. At this
point in the ISSU process, use this command to check that
the standby supervisor engine is loaded and is in SSO mode.
Step 4
Switch# show redundancy [ states ]
Displays redundancy facility state information.