Hardware Requirements; Software Requirements - Cisco ASA Series Cli Configuration Manual

Failover System Requirements
Note
When the ASA is configured for Active/Active Stateful Failover, you cannot enable IPsec or SSL VPN.
Therefore, these features are unavailable. VPN failover is available for Active/Standby failover
configurations only.
Failover System Requirements
This section describes the hardware, software, and license requirements for ASAs in a failover
configuration.
This section includes the following topics:
•
•
•

Hardware Requirements

The two units in a failover configuration must be the same model, have the same number and types of
interfaces, the same SSMs installed (if any), and the same RAM installed.
If you are using units with different flash memory sizes in your failover configuration, make sure the
unit with the smaller flash memory has enough space to accommodate the software image files and the
configuration files. If it does not, configuration synchronization from the unit with the larger flash
memory to the unit with the smaller flash memory will fail.

Software Requirements

The two units in a failover configuration must be in the same operating modes (routed or transparent,
single or multiple context). They must have the same major (first number) and minor (second number)
software version. However, you can use different versions of the software during an upgrade process; for
example, you can upgrade one unit from Version 8.3(1) to Version 8.3(2) and have failover remain active.
We recommend upgrading both units to the same version to ensure long-term compatibility.
See the
License Requirements
The two units in a failover configuration do not need to have identical licenses; the licenses combine to
make a failover cluster license. See the
more information.
Cisco ASA Series CLI Configuration Guide
1-2
Hardware Requirements, page 1-2
Software Requirements, page 1-2
License Requirements, page 1-2
"" section on page 1-1 for more information about upgrading the software on a failover pair.
"Failover or ASA Cluster Licenses" section on page 1-30
Chapter 1 Information About Failover
for