Cisco ACE-4710-1F-K9 User Guide - Page 17

Downgrading Your ACE Software in a Redundant Configuration Downgrading Your ACE Software in a Redundant Configuration If you need to downgrade your ACE software to an earlier ACE software version, use the procedure that follows. This procedure assumes that your ACEs are configured as redundant peers to ensure that there is no disruption to existing connections during the downgrade process. In the following procedure, the active ACE is referred to as ACE-1 and the standby ACE is referred to as ACE-2. Before You Begin Before you downgrade your ACE software, be sure that your ACE meets the following downgrade prerequisites: • Before you downgrade your ACE software, ensure that the following conditions exist: - Identical versions of the previous software image resides in the image: directory of both ACEs. - The active ACE has a higher priority than the standby ACE and preempt is enabled on the FT group if you want the active ACE to remain active after the downgrade procedure. • All DM GUI browsers require that you enable cookies, JavaScript/scripting, Adobe Flash Player 9, and popup windows. Whenever you plan to downgrade the ACE appliance software, end clients will need to clear their browser cache of each client to properly use the DM GUI. • Starting in software version A4(2.0), the maximum number of concurrent connections for optimization is reduced to 100 connections. If your startup configuration contains the concurrent-connections command in optimize configuration mode and you downgrade the ACE from software version A4(2.0), this command is removed from the startup configuration. You must reconfigure it after the downgrade process is completed. • If your ACE includes the 0.5-Gbps bundled license (ACE-4710-0.5F-K9) that is available with software version A3(2.0) or later, ensure that you first uninstall the 0.5-Gbps bundle prior to downgrading to an earlier ACE software version. The ACE defaults to the 1-Gbps license. Note If you have installed one of the other available ACE license bundles in addition to the 0.5-Gbps bundled license, and you downgrade to an earlier software version without first uninstalling those bundled licenses, the ACE may not downgrade properly to the original system defaults. In this case, you may observe an inconsistent behavior in the system defaults of the ACE. Downgrade Procedure To downgrade your A4(2.0) or later ACE software to an earlier ACE software version in a redundant configuration, perform these steps: Step 1 If you have previously created checkpoints in your running-configuration files (highly recommended), roll back the configuration in each context on each ACE to the configuration defined by the checkpoint. For example: ACE-1/Admin# checkpoint rollback CHECKPOINT_ADMIN ACE-1/Admin# changeto C1 ACE-1/C1# checkpoint rollback CHECKPOINT_C1 Do the same on the other ACE. For information about creating checkpoints and rolling back configurations, see the Administration Guide, Cisco ACE Application Control Engine. OL-25719-01 Upgrade/Downgrade Guide, Cisco ACE 4700 Series Application Control Engine Appliance 17