Cisco 4700M Administration Manual page 274

Performing Software Upgrades and Downgrades
Configure ACE-1 to autoboot from the previous image. To set the boot variable and configuration
Step 7
register to 0x1 (perform auto boot and use startup-config file), use the boot system image: and
config-register commands in configuration mode. For example, enter:
ACE-1/Admin# config
ACE-1/Admin(config)# boot system image:c4710ace-mz.A1_8_0A.bin
ACE-1/Admin(config)# config-register 0x1
ACE-1/Admin(config)# exit
ACE-1/Admin#
You can set up to two images through the boot system command. If the first image fails,
the ACE tries the second image.
Note
Verify the boot variable was synchronized to ACE-2 by entering the following command on ACE-2:
Step 8
ACE-2/Admin# show bootvar
BOOT variable = "disk0:/c4710ace-mz.A1_8_0A.bin;
disk0:/c4710ace-mz.A3_1_0.bin"
Configuration register is 0x1
Enter the show ft group detail command in Exec mode to verify the state of each appliance. Downgrade
Step 9
the ACE that has its Admin context in the STANDBY_HOT state (ACE-2) first by entering the reload
command.
ACE-2/Admin# reload
This command will reboot the system
Save configurations for all the contexts. Save? [yes/no]: [yes]
When ACE-2 loads the startup-configuration file, you may observe a few errors if you did not roll back
the configuration to a checkpoint. These errors are harmless and occur because the ACE software does
not recognize the A3(1.0) commands in the startup-configuration file.
After ACE-2 boots up, note the following:
For software version A1(8.0) or A1(8.0a), after ACE-2 boots up, it may take a few minutes to reach
•
the STANDBY_WARM state again.
For software version A1(7a) or A1(7b), after ACE-2 boots up, it may take a few minutes to reach
•
the STANDBY_HOT state again.
Configuration synchronization is still enabled and the connections through ACE-1 are still being
replicated to ACE-2.
Perform a graceful failover of all contexts from ACE-1 to ACE-2 by entering the ft switchover all
Step 10
command in Exec mode on ACE-1. ACE-2 becomes the new active ACE and assumes mastership of all
active connections with no interruption to existing connections.
ACE-1/Admin# ft switchover all
Reload ACE-1 with the same downgrade software version as ACE-2. Again, you may observe a few
Step 11
errors as ACE-1 loads the startup-configuration file.
ACE-1/Admin# reload
This command will reboot the system
Save configurations for all the contexts. Save? [yes/no]: [yes]
After ACE-1 boots up, it assumes the role of standby and enters the STANDBY_HOT state (this may
take several minutes).
Cisco 4700 Series Application Control Engine Appliance Administration Guide
A-8
Use the no boot system image: command to unset the previously configured boot variable.
Appendix A Upgrading or Downgrading Your ACE Software
OL-20823-01