Configuring The Rollback Timer To Safeguard Against Upgrade Issues - Cisco Catalyst 4500 Series Software Configuration Manual

Chapter 7 Configuring the Cisco IOS In-Service Software Upgrade Process

Configuring the Rollback Timer to Safeguard Against Upgrade Issues

Cisco IOS software maintains an ISSU rollback timer, to safeguard against an upgrade that may leave
the new active supervisor engine in a state in which communication with the standby supervisor engine
is severed.
You may want to configure the rollback timer to fewer than 45 minutes (the default) so that the user need
not wait in case the new software is not committed or the connection to the switch was lost while it was
in runversion mode. A user may want to configure the rollback timer to more than 45 minutes in order
to have enough time to verify the operation of the new Cisco IOS software before committing the new
image.
The valid timer value range is from 0 to 7200 seconds (two hours). A value of 0 seconds disables the
Note
rollback timer.
Once you are satisfied that the ISSU process has been successful and you want to remain in the current
state, you must indicate acceptance by entering the issu acceptversion command, which stops the
rollback timer. Entering the issu acceptversion command is extremely important in advancing the ISSU
process.
Entering the issu commitversion command at this stage is equal to entering both the issu acceptversion
and the issu commitversion commands. Use the issu commitversion command if you do not intend to
run in the current state now and are satisfied with the new software version.
The rollback timer can be configured only in the ISSU Init state.
Note
Perform this task to configure the rollback timer:
Command or Action
Step 1
Switch> enable
Step 2
Switch# configure terminal
Step 3
Switch(config)# issu set rollback-timer
:: ::
hh mm ss
Step 4
Switch(config)# exit
Step 5
Switch# show issu rollback-timer
This example shows how to set the rollback timer to 3600 seconds:
Switch> enable
Switch# configure terminal
Enter configuration commands, one per line.
Switch(config)# issu set rollback-timer 3600
% Rollback timer value set to [ 3600 ] seconds
Switch(config)# exit
Switch# show issu rollback-timer
Rollback Process State = Not in progress
Configured Rollback Time = 60:00
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.0E and IOS 15.2(5)E
Purpose
Enables privileged EXEC mode.
• Enter your password if prompted.
Enters global configuration mode.
Configures the rollback timer value.
Returns the user to privileged EXEC mode.
Displays the current setting of the ISSU rollback timer.
End with CNTL/Z.
Performing the ISSU Process
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