From: Richard Dumoulin (richard.dumoulin@vanco.es)
Date: Sat Apr 24 2004 - 14:35:35 GMT-3
This is what confused me. Common sense tells me that broadcast englobes
multicast but it is actually the other way around Matematically broadcast
is a subset of the multicast group because of the property you just made me
notice (xxxxxxx1 is more general than 11111111). Now it makes more sense to
me and I will never think again of multicast being a subset of broadcast,
Cheers
--Richard
-----Original Message-----
From: Scott Morris [mailto:swm@emanon.com]
Sent: sabado, 24 de abril de 2004 15:20
To: Richard Dumoulin; ccielab@groupstudy.com
Subject: RE: Cat 3550 storm-control
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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