dvmrp in switch

Hi,all
  I have two questions about dmvrp when developing
dvmrp in switch.

<1>¡¢when a multicast trffic packet received from
     upstream interface, if another port which
     is in the same VLAN of receiving port and
     it has a host wanting to recieve that 
     multicast traffic packet, then how can
     switch forward the multicast traffic packet
     from the receiving port to the port which
     has a receiving host?
<2>¡¢If one port in the non-designated forwarding
     interface has a group receiving host, then 
     how can switch forward the multicast traffic
     packet from designated forwarder to the the
     port in the non-designated forwarding interface?
     

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