Cisco ACE-4710-1F-K9 User Guide - Page 18

Downgrading Your ACE Software in a Redundant Configuration Step 2 Configure ACE-1 to automatically boot from the earlier ACE software image. To set the boot variable and configuration register to 1, 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.A3_2_7.bin ACE-1/Admin(config)# config-register 1 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 to boot from the second image. Step 3 Step 4 Note Use the no boot system image:ACE_image command to remove the configured A3(x.x) boot variable. Verify that the boot variable was synchronized to ACE-2 by entering the following command on ACE-2: ACE-2/Admin# show bootvar BOOT variable = "disk0:c4710ace-mz.A3_2_7.bin" Configuration register is 0x1 host1/Admin# Verify the state of each ACE by entering the show ft group detail command in Exec mode. Downgrade first the ACE that has its Admin context in the STANDBY_HOT state (ACE-2) 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 A4(2.0) (or later) commands in the startup-configuration file. Note Dynamic incremental sync is automatically disabled while the active ACE is running software version A4(2.0) or later and the standby ACE is running an earlier software version. Step 5 Step 6 Perform a graceful failover of all contexts from ACE-1 to ACE-2 by entering the ft switchover all command in Exec mode on ACE-1. ACE-2 becomes the new active ACE and assumes control of all active connections with no interruption to existing connections. ACE-1/Admin# ft switchover all Reload ACE-1 with the same ACE software version as ACE-2. You may observe a few errors as ACE-1 loads the startup-configuration file. ACE-1/Admin# reload After ACE-1 boots up, it assumes the role of standby and enters the STANDBY_HOT state (this can take several minutes). You can verify the states of both ACEs by entering the show ft group detail command in Exec mode. Because the standby ACE has changed its state to either STANDBY_COLD or STANDBY_HOT, the configuration mode is enabled. The configuration is synchronized from ACE 2 (currently active) to ACE-1. If ACE-1 is configured with a higher priority and preempt is configured on the FT group, ACE-1 reasserts control after it has received all configuration and state information from ACE-2, making ACE-2 the new standby. ACE-1 becomes the active ACE again. Upgrade/Downgrade Guide, Cisco ACE 4700 Series Application Control Engine Appliance 18 OL-25719-01