Re: PIM : detecting duplicate packet

Hi,
I am confused about behaviour on lan interfaec. 
On the lan interface we can have multiple neighbors on the same
interface that time incoming interface remains same but still 
packet can come from different neighbors.

I am just giving one simple network topology as example.


       
       R1               R2
       |                |
       |                |
       |----------------|
            |
            |
            |
           R3
            |
            |
          Receiver

R3 has 
RPF_interface(S)= R1 and
RPF_interface(RP) = R2 
After switching to SPTree R3 may receive 2 packets..??



or following topology



          RP
           |
           |
           |
          Rs------Sender
           |
           |
           |
          Rr
           |
           |
          Receiver
In above topology at Rr, RPF_interface(S) and RPF_interface(RP)
are same.
       

Ajay


--
Open WebMail Project (http://openwebmail.org)


---------- Original Message -----------
From: [email protected]
To: tajay <[email protected]>
Cc: [email protected]
Sent: Sun, 10 Dec 2006 17:49:11 +0100
Subject: Re: [magma] PIM : detecting duplicate packet

> Quoting tajay <[email protected]>:
> 
> > Hi,
> Hello,
> You dont really need to detect that a packet is duplicated.
> It is  sufficient to detect if  a native multicast packet from a 
> given  source S has been received by the incoming interface of the 
> source tree for S
> (and this interface is different from the incoming interface of the 
> shared tree for the same group)
> 
> cheers
> Jean-Jacques
> 
> > Most of the opimization algorithms in PIM depends on detecting   
> > duplicate packets.
> > e.g
> > (1) sending register stop once RP starts receiving duplicate packets
> > (2) DR @ source sends prunes (S,G) from RPTree whenever it receives duplicate
> > packets from source.
> >
> > Is there any specific way to identify duplicate packets? And how feasible it
> > is to detect duplicate packets at very high rate traffic?
> >
> > Ajay
> >
> >
> > --
> > Open WebMail Project (http://openwebmail.org)
> >
> >
> > _______________________________________________
> > magma mailing list
> > [email protected]
> > https://www1.ietf.org/mailman/listinfo/magma
> >
------- End of Original Message -------