The virtual MAC address of the virtual router. This is derived
as follows: 00-00-5E-00-01-<VRID>.
Where the first three octets consist of the IANA's OUI, the
next two octets indicate the address block of the VRRP protocol,
and the remaining octets consist of the VRID.
Although this object can be derived from the 'wfVrrpAdminVrId'
object, it is included here, for completeness.