MAC address pool. For example, if the range of MAC addresses shown for module 1 is b0aa.772f.f0b0 to
b0aa.772f.f0bf, then the system prefix will be f0b0.
The user-defined prefix is an integer that is converted into hexadecimal. For an example of how the user-defined
prefix is used, if you set a prefix of 77, then the chassis converts 77 into the hexadecimal value 004D (yyxx).
When used in the MAC address, the prefix is reversed (xxyy) to match the chassis native form:
A24D.00zz.zzzz
For a prefix of 1009 (03F1), the MAC address is:
A2F1.03zz.zzzz
Performance Scaling Factor for Multi-Instance Mode
The maximum throughput (connections, VPN sessions) for a platform is calculated for an appliance mode
device's use of memory and CPU (and this value is shown in show resource usage). If you use multiple
instances, then you need to calculate the throughput based on the percentage of CPU cores that you assign to
the instance. For example, if you use an instance with 50% of the cores, then you should initially calculate
50% of the throughput. Moreover, the throughput available to an instance may be less than that available to
an appliance.
For detailed instructions on calculating the throughput for instances, see https://www.cisco.com/c/en/us/
products/collateral/security/firewalls/white-paper-c11-744750.html.
Instances and High Availability
You can use High Availability using an instance on 2 separate chassis; for example, if you have 2 chassis,
each with 10 instances, you can create 10 High Availability pairs. You can also have standalone instances on
the same chassis as High Availability instances. For detailed requirements, see Requirements and Prerequisites
for Instances, on page 14.
Clustering is not supported.
Note
Licenses for Instances
All licenses are consumed per chassis and not per instance. See the following details:
• Essentials licenses are assigned to the chassis as a whole, one per chassis.
• Feature licenses are assigned to each instance, but you only consume one license per feature per chassis.
Requirements and Prerequisites for Instances
Model Support
• Secure Firewall 3110
Multi-Instance Mode for the Secure Firewall 3100
14
Multi-Instance Mode for the Secure Firewall 3100
Performance Scaling Factor for Multi-Instance Mode
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