RE: multicast-transition (fwd)

[w-itonaga@ab.jp.nec.com]

I think the trace-route method is not useful 
because host has to send packets untill finding an edge multicast router.
How about the IP alert option method?
By this method, host will send an UDP packet to S only once.

>Detecting the optimal router using trace-route:
>===============================================
>We now suggest an automatic router discovery method, using trace-route. The
>joining host will use standard trace-route algorithm in order to locate the
>first router towards the source. Then, it will send a UDP join massage to
>this router, as defined above. If the router does not acknowledge, the host
>will check the next router, and so on, until it finds a router that is
>SSM-enabled. This router will be used for tunneling.

Wataru