From: Sadiq Yakasai (sadiqtanko@gmail.com)
Date: Tue May 20 2008 - 07:05:05 ART
HI Roger,
I think you are mixing up two different roles and direction as far as
MCAST traffic forwarding goes:
The Designated Forwarder is responsible for delivering MCAST traffic
from the source (or RP) **TO** the LAN segment (having more than one
entry/exit point) where the receivers of the traffic are located. The
Assert message is used to elect the router to be used as a DF (higher
IP address wins).
While the Designated Router is responsible for delivering mcast
traffic **FROM** a LAN segment (whether there is only one or multiple
exit points). You are right in that in IGMPv1, the DR is the same as
the Querier automatically.
While in IGMPv2, a DR could be different from the Querier. In this
case, the DR is elected based on the highest IP adress while the
Querier election is based on the Lower IP address.
Hope that clears up the air a little bit more.
Sadiq
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