Maximum MAC multicast filters?
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Posted by on October 5, 2005, 8:48 am
Please log in for more thread options Greetings! There are 2^23 MAC layer multicast addresses. How many of these addresses can the hardware filters in a typical NIC handle? Will a NIC fail into some sort of limited (multicast) promiscuous mode when I exceed that number? Will it perhaps fall into full-blown promiscuous mode when I exceed that number? What is the name of this parameter? I'd like to be able to find it on spec sheets (or at least google), but I'm not even sure of what to call it. Many thanks. /chris | ||||||||||||||||||||||||||||
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Posted by News Me on October 5, 2005, 5:47 pm
Please log in for more thread options googlegroups@marget.com wrote: A single bit in the 48-bit MAC address determines whether the address is unicast or multicast. I think that implies there are a theoretical 2^47 MAC-layer multicast addresses. NM -- convert UPPERCASE NUMBER to a numeral to reply | ||||||||||||||||||||||||||||
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Posted by James Knott on October 5, 2005, 9:24 pm
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News Me wrote: > googlegroups@marget.com wrote:
>> Greetings!
>> >> There are 2^23 MAC layer multicast addresses. >
> A single bit in the 48-bit MAC address determines whether the address is > unicast or multicast. I think that implies there are a theoretical 2^47 > MAC-layer multicast addresses. Isn't there another one for ethernet/token ring? That means there'd be only 2^46 total addresses. That's barely enough to go 'round. ;-) | ||||||||||||||||||||||||||||
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Posted by anoop on October 6, 2005, 1:01 am
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James Knott wrote: > News Me wrote:
> > > googlegroups@marget.com wrote:
> >> Greetings!
> >> > >> There are 2^23 MAC layer multicast addresses. > >
> > A single bit in the 48-bit MAC address determines whether the address is > > unicast or multicast. I think that implies there are a theoretical 2^47 > > MAC-layer multicast addresses. >
> Isn't there another one for ethernet/token ring? That means there'd be only > 2^46 total addresses. That's barely enough to go 'round. ;-) No there isn't. MAC addresses are the same regardless of the media. Anoop | ||||||||||||||||||||||||||||
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Posted by James Knott on October 6, 2005, 12:04 pm
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anoop wrote: >> Isn't there another one for ethernet/token ring? That means there'd be
>> only >> 2^46 total addresses. That's barely enough to go 'round. ;-) >
> No there isn't. MAC addresses are the same regardless of the media. > Sorry, my mistake. I was thinking of the locally assigned address bit. LAAs are (were?) commonly used on token ring. | ||||||||||||||||||||||||||||
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>
> There are 2^23 MAC layer multicast addresses.