Hi,
finally someone replied me back :) thanks ..
Ronald , is this means that Source directly sends SA messages to RP ? or it
sends these messages to DR and throgh DR RP gets the message ?
>
> Message: 8
> Date: Tue, 14 Jul 2009 20:15:29 +0000
> From: RONALDO NASCIMENTO <[email protected]>
> Subject: Re: [OSL | CCIE_RS] please help in understanding multicast
> To: <[email protected]>,
> <[email protected]>
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset="windows-1252"
>
>
> Hi,
>
>
>
> My understanding is that the DR election takes place only because you may
> have multiple routers on a given network (i.e., LAN) so one needs to be
> elected, a DR, in order to send/receive IGMP report messages to RP and
> minimize traffic that way.
>
>
>
> The Mapping Agent (MA) learns and build tables showing respective group
> address and RP address. It sends a multicast message "RP-Discovery" to
> 224.0.1.40 group and from there routers can learn which are the RP's for the
> respective group.
>
>
>
>
> Ronaldo Nascimento
>
>
>
>
>
>
>
>
>
> From: [email protected]
> To: [email protected]; [email protected]
> Date: Mon, 13 Jul 2009 13:20:08 +0000
> Subject: [OSL | CCIE_RS] please help in understanding multicast
>
>
>
>
>
>
> 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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> End of CCIE_RS Digest, Vol 42, Issue 81
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