can ssm and non-ssm colide ?

["Dany Shterman" <danshterman@hotmail.com>]

    Hi.
I understand that a router can have 2 types of multicast forwarding rules:

1. (S,D) : i.e do multicast to a packet that arrives with IP destination   
"d" and IP source "s" iff S=="s" and D=="d". 2. (*,D) : i.e do multicast to 
a packet that arrives with IP destination   "d" iff D=="d".

Questions:
a. is it true ?
b. is it possible that a router will have 2 contradicting forwarding   rules 
: (S,D) and (*,D) that direct traffic to 2 different ports,   for the same 
IP destination address D ?
c. If the answer to the previous question is true, then to what port   
should the router forward ?

ThankX.
Dan







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