Hi,
I have a question about IGMP queries and reports.
1. When an IGMP querier router sends a query, this packet is sent to
224.0.0.1
address (01-00-5e-00-00-01) to which all multicast capable hosts listen.
2. When a host sends a membership report (either in reponse to the query, or
an unsolicited report ) for the group in which it is a member ( say
224.1.1.1), the report is sent to the 224.1.1.1 address. This is the address
specified in the 'Group address' field of the IGMP report message, as well as
the destination IP address of the IP packet carrying this report. The
Ethernet frame that encapsulates this packet would carry the destination
Layer-2 multicast address of 01-00-5e-01-01-01. This method ensures report
suppression by other hosts which are members of the same group, as they will
listen to this address and suppress their reports.
The querying router has to pick this frame and look into the IGMP report to
know that the host is or wants to be a member of 224.1.1.1 group. Does it
mean
that router is also a member of this group inorder to pick this frame and
process the report message ?
If another host is a member of a different group 224.1.1.2 and sends report
to this address, should the router listen to this address also to process the
reports for this group ?
How will the router to know what groups it should listen to, so that it can
process the report messages to find out what groups are active ?
What method does the router use, if this is not the correct one ?
Thanks,
Srikanth.
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=11062&t=11062
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