License MAC Generation

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Revision as of 21:54, 15 December 2010

Several Cisco Unified Communications applications use a different license enforcement mechanism when on VMware vs. when on non-virtualized servers such as MCS 7800. These applications enforce licensing via a software-generated "License MAC" instead of the "burned-in" MAC address on the physical server's NIC.

For applications that require a License MAC, it can be created using the Answer File Generator prior to application installation in the Virtual Machine. This will output both the License MAC value as well as the answer file for unattended installation. This method is recommended as the most effective way to obtain the license MAC.

A License MAC is in the same format as a physical MAC address, i.e. a 12 digit hexadecimal value, but it is generated by hashing the following user-configured parameters:

  • Time zone
  • NTP server 1 (or “none”)
  • NIC speed (or “auto”)
  • Hostname
  • IP Address (or “dhcp”)
  • IP Mask (or “dhcp”)
  • Gateway Address (or “dhcp”)
  • Primary DNS (or “dhcp”)
  • SMTP server (or “none”)
  • Certificate Information (Organization, Unit, Location, State, Country)
run the 'show status' CLI command after installation. 

To view the current value of a License MAC for applications that require it, after installation select Show > System in the Cisco Unified Operating System Administration web page or run the CLI command "show status".

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