Cisco Catalyst 4500 Series, Руководство по настройке программного обеспечения

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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.0E and IOS 15.2(5)E
Chapter 7 Configuring the Cisco IOS In-Service Software Upgrade Process
Performing the ISSU 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.
Note
The valid timer value range is from 0 to 7200 seconds (two hours). A value of 0 seconds disables the
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.
Note
The rollback timer can be configured only in the ISSU Init state.
Perform this task to configure the 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. End with CNTL/Z.
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
Command or Action Purpose
Step 1
Switch> enable
Enables privileged EXEC mode.
•
Enter your password if prompted.
Step 2
Switch# configure terminal
Enters global configuration mode.
Step 3
Switch(config)# issu set rollback-timer
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Configures the rollback timer value.
Step 4
Switch(config)# exit
Returns the user to privileged EXEC mode.
Step 5
Switch# show issu rollback-timer
Displays the current setting of the ISSU rollback timer.