Bikespace,
Just spent a day testing exactly this...spooky

You're correct , Cisco's cannot put a multicast mac in its arp cache
dynamically - BUT - you CAN put STATIC ARP entries in a Cisco pointing to a
multicast mac.( Even if Layer3 is unicast)

However there are some small perfomance points here ( only small !)
Turning CEF on does have some benefits but not huge amounts.

I threw 100 * 512 byte UPD segments at the Cisco for 5 mins while using a
static multicast arp entry - It coped just fine.


HTH Rich


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