From: WorkerBee (ciscobee@gmail.com)
Date: Thu May 18 2006 - 10:09:53 ART
Hey Guys,
I have finally found my answer to my silly question.
The IGMP clients will reply to 224.0.0.2 upon receiving IGMP query,
hence the PIM Forwarder is able to receive the IGMP report and
continue to forward multicast packets to the clients. Therefore, it
doesn't really matter if the IGMP query or the PIM forward belongs to
the same or different routers.
Thanks.
PS: 224.0.0.2 is the multicast address of all routers.
> ---------- Forwarded message ----------
> From: WorkerBee <ciscobee@gmail.com>
> To: ccielab@groupstudy.com
> Date: Thu, 18 May 2006 20:50:19 +0800
> Subject: IGMP Querier and PIM Forwarder Relationship
> In a LAN, there are 2 routers running multicast.
>
> By defination/RFC ,the lowest ip router is the IGMP Querier and
> the highest ip router is the PIM Forwarder (PIM-SM/PIM-DM).
>
> I am confused. If the IGMP Querier and PIM Forwarder are
> different routers within the same LAN segment, how does the
> PIM Forwarder knows there are clients on the LAN requesting for
> multicast traffic
> if that PIM Forwarder router is not a IGMP Querier?
>
> I read many articles about IGMP Querier/PIM DR/Forwarder but
> none really touch about the relationship between them. Or they
> are actually 2 seperate protocols that greatly puzzle me.
>
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This archive was generated by hypermail 2.1.4 : Thu Jun 01 2006 - 06:33:21 ART