some questions about RFC4605 -- IGMP/MLD multicast proxy

Hi,

I have a few questions regarding RFC 4605.

(1) In RFC 4605, it defines that a proxy device has a single upstream interface and one or more downstream interfaces. What's the reason for the restriction of only one upstream interface? 

(2) It is said in the RFC that the proxy device MUST NOT perform the router portion of IGMP/MLD on its upstream interface. There's no restriction on performing the host portion of IGMP/MLD on the downstream interfaces. Does that mean it's okay to send out reports which are received from one downstream interface to other downstream interfaces? Wouldn't it cause problems if the hosts attached to downstream interfaces support report suppression? 

(3) What should the proxy device do except for querier election if it receives MLD query on downstream interfaces? Shuold it send out MLD report on downstream interfaces? (This question is related to (2) though.)

It's not clear about the protocol behaviors in RFC 4605 and I'm quite confused. Thanks in advance if anybody have explanations.



BR,
Yu-Jung

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