Subject: [pim] Questions: Handling State Change Reports -- Part 2

From: [email-masked]
Date: Fri, 18 Nov 2005 16:00:26 -0800

> Hello, 
We had the following questions on section 6.4.2. on rfc 3376.

> Question 1
> ----------------------------------------------------------------------
> -----------------------------------------
> Router State 	Report Received	New Router State	    Actions
> ----------------------------------------------------------------------
> -----------------------------------------
> (1) EXCLUDE(X,Y)   BLOCK(A)	            EXCLUDE(X+(A-Y),Y)
> A-X-Y = Group Timer
 
Send Q(G,A-Y)

> (2) EXCLUDE(X,Y)   TO_EX(A)              EXCLUDE(A-Y, Y*A)
> A-X-Y = Group Timer
 
Delete (X-A)
 
Delete (Y-A) 
 
Send Q(G, A-Y)
 
Group Timer=GMI
> ----------------------------------------------------------------------
> ----------------------------------------
> 
> Could someone illustrate these 3 steps in the state machine a bit more
> in detail may be with 
> an example. When we do the calculations, we get a new router state of:
>  
> EXCLUDE(X, Y+A) for (case 1)  and EXCLUDE(X, Y*A) for (case 2)    
> 
> Question 2
> ----------------------------------------------------------------------
> ---------------------------------------
> Router State 	Report Received	New Router State	Actions
> ----------------------------------------------------------------------
> ---------------------------------------
> EXCLUDE(X,Y)   TO_IN(A)                    EXCLUDE(X+A, Y-A)    (A) =
> GMI
 
Send Q(G,X-A)
 
Send Q(G)
> ----------------------------------------------------------------------
> -----------------------------------------
> 
> While we get the same new router state as the RFC, why does the RFC
> require the router to 
> send a group and source specific query for the set of sources in X-A? 
> 
> Please advise. 
> 
> Regards,
> Sowmya

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