From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Sat Apr 24 2004 - 11:30:22 GMT-3
I remind myself of this difference between multicasts and broadcasts
with a quote from Groucho Marx, admitting I'm probably dating myself.
Groucho said he wouldn't belong to any club that would have him as a member.
The universe of multicast addresses is the universe of clubs. The
broadcast address is the club that will admit Groucho.
At 9:20 AM -0400 4/24/04, Scott Morris wrote:
>A multicast, as you mentioned is determined by the I/G bit. So multicasts
>are xxxxxxx1 in the first byte. A broadcast on the other hand is 11111111
>in the first byte.
>
>It's that set/intersection rule kinda like we learned in algebra or
>trigonometry way back when. ;) All broadcasts are a set of multicasts, but
>not all multicasts are considered broadcasts.
>
>HTH,
>
>
>Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, CISSP,
>JNCIS, et al.
>IPExpert CCIE Program Manager
>IPExpert Sr. Technical Instructor
>swm@emanon.com/smorris@ipexpert.net
>http://www.ipexpert.net
>
>
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>Richard Dumoulin
>Sent: Saturday, April 24, 2004 8:10 AM
>To: ccielab@groupstudy.com
>Subject: Cat 3550 storm-control
>
>Hello group,
>
>
>Something I just learnt yersteday is that when setting the level of
>multicast storm then the level of broadcast storm is implicitly set too
>!?!?!? The reason why is because of the I/G bit set to 1 in the ethernet
>destination mac-address.
>But It apparently seems that setting the broadcast storm level does not
>affect the multicast storm level !?!?
>
>What I don't understand is why multicast storm control imply broadcast storm
>control but the reverse is not true ?
>
>Thanks,
>
>--Richard
>
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