From: Scott Morris (swm@emanon.com)
Date: Sat Apr 24 2004 - 10:20:21 GMT-3
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
This archive was generated by hypermail 2.1.4 : Mon May 03 2004 - 19:48:54 GMT-3