Cisco ASA Series Cli Configuration Manual page 196

Guidelines and Limitations
Older versions of ASA software required that the licenses match on each unit. Starting with Version
8.3(1), you no longer need to install identical licenses. Typically, you buy a license only for the
primary unit; for Active/Standby failover, the secondary unit inherits the primary license when it
becomes active. If you have licenses on both units, they combine into a single running failover
cluster license.
Note
•
For the ASA 5505 and 5510, both units require the Security Plus license; the Base license does not
support failover, so you cannot enable failover on a standby unit that only has the Base license.
Upgrade and Downgrade Guidelines
Your activation key remains compatible if you upgrade to the latest version from any previous version.
However, you might have issues if you want to maintain downgrade capability:
•
Downgrading to Version 8.1 or earlier—After you upgrade, if you activate additional feature
licenses that were introduced before 8.2, then the activation key continues to be compatible with
earlier versions if you downgrade. However if you activate feature licenses that were introduced in
8.2 or later, then the activation key is not backwards compatible. If you have an incompatible license
key, then see the following guidelines:
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–
•
Downgrading to Version 8.2 or earlier—Version 8.3 introduced more robust time-based key usage
as well as failover license changes:
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Additional Guidelines and Limitations
•
The activation key is not stored in your configuration file; it is stored as a hidden file in flash
memory.
•
The activation key is tied to the serial number of the device. Feature licenses cannot be transferred
between devices (except in the case of a hardware failure). If you have to replace your device due
to a hardware failure, and it is covered by Cisco TAC, contact the Cisco Licensing Team to have your
existing license transferred to the new serial number. The Cisco Licensing Team will ask for the
Product Authorization Key reference number and existing serial number.
•
Once purchased, you cannot return a license for a refund or for an upgraded license.
Cisco ASA Series CLI Configuration Guide
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Failover units do require the same RAM on both units.
If you previously entered an activation key in an earlier version, then the ASA uses that key
(without any of the new licenses you activated in Version 8.2 or later).
If you have a new system and do not have an earlier activation key, then you need to request a
new activation key compatible with the earlier version.
If you have more than one time-based activation key active, when you downgrade, only the most
recently activated time-based key can be active. Any other keys are made inactive. If the last
time-based license is for a feature introduced in 8.3, then that license still remains the active
license even though it cannot be used in earlier versions. Reenter the permanent key or a valid
time-based key.
If you have mismatched licenses on a failover pair, then downgrading will disable failover. Even
if the keys are matching, the license used will no longer be a combined license.
If you have one time-based license installed, but it is for a feature introduced in 8.3, then after
you downgrade, that time-based license remains active. You need to reenter the permanent key
to disable the time-based license.
Chapter 1 Managing Feature Licenses