Subject: [magma] local loops in IGMP/MLD-based Multicast Forwarding

From: ahlem elhaj <[email-masked]>
Date: Mon, 31 Oct 2005 04:32:54 -0800 (PST)

In draft-ietf-magma-igmp-proxy-06.txt, an “upstream loop” happens when we have this configuration where A and B are IGMP/MLD-proxies:

           LAN 1  --------------------------------------

                  Upstream |              | Downstream

                           A              B

                Downstream |              | Upstream

           LAN 2  --------------------------------------

This loop is due to unconditional sending of multicast traffic from a downstream interface of a proxy to its upstream interface.

I think we have also a local loop with the following configuration (both A and B are configured as IGMP/MLD-proxies):

           LAN 1  --------------------------------------

                  Upstream |              | Upstream

                           A              B

                Downstream |              | Downstream

           LAN 2  --------------------------------------

For this reason: if A forwards packets destined for a multicast group G mentioned in its Membership Database from LAN 1 to LAN 2, this packets will be automatically retransmitted by B from LAN 1 to LAN 2 and etc …

Am I making any confusion?

Thanks for help,

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