Re: IGMP/MLD-Proxying: broken upstream forwarding rule? (RFC 4605 section 4.2)

Hi Alvaro!

Alvaro Fernandez wrote:
> Mark wrote:
> 
>> I can live with that, but then I wonder what's the forwarder selection
>> (for downstream forwarding) is good for. If there's always only a single
>> router towards the root (as it is the case in a tree topology), there is
>> no need for selecting a designated forwarder.
> 
> The tree topology restriction is only for IGMP proxys but multiple IGMP
> routers (not proxies) can be connected to the same shared LAN. I think this
> is the reason why DR election is needed.

Hmm, forwarder selection differs from protocol to protocol (IGMP/MLD Proxying:
querier election (downstream only), BIDIR-PIM: designated forwarder election
(both directions), PIM-SM/-DM: asserts, DVMRP/MOSPF: inherent (best metric to
source/to receiver)). So I suppose this feature won't help interworking
between different protocols.

Mark.