A virtual router in an HSRP group has a virtual IP address and a virtual MAC address. So
where does that virtual MAC come from? The virtual IP address isn’t that hard to figure
out; it just has to be a unique IP address on the same subnet as the hosts defined in the
configuration. But MAC addresses are a little different, right? Or are they? The answer is
yes—sort of. With HSRP, you create a totally new, made-up MAC address in addition to
the IP address.