Depending on specific markets and international export regulations, some Cisco ASA models may also ship with the permanent No Payload Encryption license this license ties to the particular hardware without the option of change or removal. For instance, at the time of writing, the clustering feature is currently available only on Cisco ASA 5500-X, ASA 5580, and ASA 5585-X appliances. Not all of the licensed features and capabilities are available on all hardware platforms. On the Cisco ASA 5580 platform, the Base License allows creating up to two application contexts, while several premium licenses of different tiered counts allow extending this limit up to 250 contexts in total. An example of such a feature is the ability to configure security contexts on some Cisco ASA appliances.
Other features may carry their own capacity limits that come in quantified tiers.For instance, the Botnet Traffic Filter license will allow you to protect all connections through a Cisco ASA up to the maximum limit for the platform. Some capabilities operate in a simple binary switch fashion whereby the license for the feature type is either enabled or disabled once enabled, there are typically no direct restrictions on how much the feature can be used.In addition to the Base and Security Plus licenses, you can activate other advanced security features individually: For example, you can increase the maximum concurrent firewall connection count on the Cisco ASA 5505 from 10,000 to 25,000 by installing a Security Plus license. Some platforms offer the optional Security Plus license, which may unlock additional features or capacities on top of the Base License. One example of such a feature is Active/Active failover, which is always available on all Cisco ASA 5585-X appliances. In other words, these capabilities are fixed in the given software image for the particular hardware you cannot selectively disable them. Every Cisco ASA platform comes with a certain number of implicitly activated features and capacities as a part of the Base License.
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