Chapter 9 High Availability for FortiOS 5.0 : HA and failover protection : Cluster virtual MAC addresses : How the virtual MAC address is determined : Example virtual MAC addresses
  
Example virtual MAC addresses
An HA cluster with HA group ID unchanged (default=0) and virtual domains not enabled would have the following virtual MAC addresses for interfaces port1 to port12:
port1 virtual MAC: 00-09-0f-09-00-00
port10 virtual MAC: 00-09-0f-09-00-01
port2 virtual MAC: 00-09-0f-09-00-02
port3 virtual MAC: 00-09-0f-09-00-03
port4 virtual MAC: 00-09-0f-09-00-04
port5 virtual MAC: 00-09-0f-09-00-05
port6 virtual MAC: 00-09-0f-09-00-06
port7 virtual MAC: 00-09-0f-09-00-07
port8 virtual MAC: 00-09-0f-09-00-08
port9 virtual MAC: 00-09-0f-09-00-09
port11 virtual MAC: 00-09-0f-09-00-0a
port12 virtual MAC: 00-09-0f-09-00-0b
If the group ID is changed to 34 these virtual MAC addresses change to:
port1 virtual MAC: 00-09-0f-09-22-00
port10 virtual MAC: 00-09-0f-09-22-01
port2 virtual MAC: 00-09-0f-09-22-02
port3 virtual MAC: 00-09-0f-09-22-03
port4 virtual MAC: 00-09-0f-09-22-04
port5 virtual MAC: 00-09-0f-09-22-05
port6 virtual MAC: 00-09-0f-09-22-06
port7 virtual MAC: 00-09-0f-09-22-07
port8 virtual MAC: 00-09-0f-09-22-08
port9 virtual MAC: 00-09-0f-09-22-09
port11 virtual MAC: 00-09-0f-09-22-0a
port12 virtual MAC: 00-09-0f-09-22-0b
A cluster with virtual domains enabled where the HA group ID has been changed to 23, port5 and port 6 are in the root virtual domain (which is in virtual cluster1), and port7 and port8 are in the vdom_1 virtual domain (which is in virtual cluster 2) would have the following virtual MAC addresses:
port5 interface virtual MAC: 00-09-0f-09-23-05
port6 interface virtual MAC: 00-09-0f-09-23-06
port7 interface virtual MAC: 00-09-0f-09-23-27
port8 interface virtual MAC: 00-09-0f-09-23-28