[pim] PIM RP register mechanism

["CTO YAO Chunyan" <Chunyan.YAO at alcatel-sbell.com.cn>]

Dear all: I have a question on PIM-SM RP register mechanism: Why there
needs this term "( SwitchToSptDesired(S,G) AND ( inherited_olist(S,G) ==
NULL ))" in pseudocode describing action when RP receiving following a
Register message in PIM-SM protocol (v2-new-12)? 

The text is as the following:
 

"draft-ietf-pim-sm-v2-new-12.txt", Part 4.4.2---- Receiving Register
Messages at the RP:  

When an RP receives a Register message, the course of action is decided
according to the following pseudocode:

packet_arrives_on_rp_tunnel( pkt ) 
{ 
   
   if( I_am_RP(G) AND outer.dst == RP(G) ) {

       ..... 
       if ( SPTbit(S,G) OR
           ( SwitchToSptDesired(S,G) AND ( inherited_olist(S,G) == NULL
))) {
            send Register-Stop(S,G) to outer.src
            sentRegisterStop = TRUE;
          }
       ......
   }  else {.....
           }
}


many thanks!

           Chunyan

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