Virtual MAC really necessary?

Hello everybody

I want to implement my own VRRP protocol. The protocol itself is not that  
tricky, but using a virtual MAC seems like a big hurdle to me. The  
standard states that the MAC address of the new Master has to be published  
in a gratuitous ARP (request/reply). I think this already should help to  
update the ARP table of every device. Does anybody know of a situation  
where publishing the physical MAC would cause any trouble? Are there any  
known devices that would not update their ARP table in case of such a  
gratuitous ARP?

Best regards and thanks in advance for your time,
Roland


PS:
According to the Ethereal Wiki (http://wiki.ethereal.com/Gratuitous_ARP) a  
gratuitous ARP can be either a request or a reply. Any experience which  
one is better?

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