Hi,
I need help in understanding  IP multicasting specially sparse mode.... bit  
confused 
In sparse mode we have  a RP and Maping Agent (MA).  RP announces its self to 
MA and MA receives the request from clients to join a specific multicast group 
for which RP is configured  or MA announcing. Source send the source active 
message to the RP for multicast group it has. Now my question is that whats the 
function of PIM DR how it works I just know that PIM DR is elected on the  
bases of higher priority or the higher IP Address. 
how PIM DR works in relation with  RP or MA
If I am not wrong  Source sends unicast packets to PIM DR for specific group 
then DR sends those packets to RP and then RP register itself with DR. if its 
right then  its mean Source dosent communicate with RP ??
Please someone help
 
Thanks



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