Priscilla Oppenheimer wrote: > > > I have come up with the following: > > > >"The Destination Address field indicates the destination > address as > >specified in the Bridge Group Address table. For IEEE > Spanning-Tree Protocol > >BPDU frames, the address is 0x800143000000. > > That is bit-reversed. You must have found a document that > covers Token Ring.
Indeed, this is a token ring refernce I quote > > >I guess it also depends on the definition of > multi/broad/unicast. > > It better not depend on that. There shouldn't be any argument > on those > definitions. ;-) > > Multicast means a group address. The first bit of the > destination MAC > address (which is the first bit transmitted) is a one so that > every device > knows to look at the address. A NIC driver software supports an > application > telling the NIC which particular multicasts to take in. > > Broadcast means every device in the broadcast domain. The first > bit and all > bits in the MAC destination address are ones. Every NIC in the > broadcast > domain takes in the frame and interrupts the host CPU to see if > the rest of > the frame is interesting. > > Unicast means a specific address. The first bit of the > destination MAC > address (which is the first bit transmitted) is a zero. > In terms of the definitions, I was reading through the Perlman book and noted question of the "necessity to distinguish between multicast and broadcast". I agree that the terms a concretely defined, but whether Cisco subscribes to those definitions might be in question Thanks again... your info certainly cleared this mess up. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=46842&t=46839 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
