8.1 HSRP Operation
8.1.4 The virtual router MAC address
The MAC address used by the virtual router is made up of the following three components:
  • Vendor ID - The vendor ID comprises the first three bytes of the MAC address.
  • HSRP code - These 2 bytes indicate that the MAC address is for an HSRP virtual router. The HSRP code is always 07.ac.
  • Group ID - The last byte of the MAC address is the group ID number. In the example, decimal group number 47 is being converted to hexadecimal 2f.

To display the virtual IP and MAC address use the command show standby in privileged EXEC mode.