hello,ip directed-broadcast is different from local broadcast,
eg:
R1---R2
| |
| |
172.16.1.0/24 192.16.1.0/24
as R1 concerned,a user send a broacast packet detined to 172.16.1.255,this
is local broadcast;while send 192.16.1.255,the R1 and R2 enabled "ip
directed broad" can transmit the broadcast packets destined to
192.16.1.255(isn't local),these is the difference between local broadc and
directed broadc
"ip mroute-cache",like mac table (or mac cache),set up a efficient way for
the ip routing of multicast,when first packet transmit,the inbound port bind
the source ip,outbound bind the destination ip,sequence packet can save the
resource for the routing-table lookup .
Regards, Kennith
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=73802&t=73800
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