Re: MSDP CACHING PEER VS RPF PEER

*THANKS for great info .*

but how can you say msdp peer directly connected ? .

IN my senario RP's are centrally located in each PIM SM domain , and are
physically not directly connected .

are you referring to logical tcp connection on port 639 ?

On Fri, Dec 23, 2011 at 8:41 PM, Petr Lapukhov
<petr_at_internetworkexpert.com>wrote:

> I belive your question is "whether the SA messages in SA Response are
> subject to peer-RPF checks" and "whether the caching peer must be on
> RPF path toward the originating RP". The answer is no to both
> questions, and there are two reasons:
>
> 1) MSDP SA request/response messages are not relayed, they are
> exchanged on pure p2p basis between two directly connected MSDP
> speakers (peers). Therefore, there is no need for RPF check for
> request message - it could be sent to any caching peer. Futhermore,
> the requesting RP does not know the originating RP address prior to
> requesting group state. There is even no field in SA Request message
> to encode this information :) So even if you want, you can't do an RPF
> check - only request the cached state for a group.
>
> 2) MSDP SA response messages do not carry any piggy-backed multicast
> data, unlike the SA message, so there is no need to relay that
> information either, and hence no need to RPF check the SA Response
> message.
>
> It is interesting to notice, that details on SA Request message
> exchange did not make it to MSDP RFC, though you can find them in the
> draft documents. The final RFC only specifies the TLV codes for
> request/response messages.
>
> --
> Petr Lapukhov, petr_at_INE.com
> CCIE #16379 (R&S/Security/SP/Voice)
> CCDE #20100007
>
> Internetwork Expert, Inc.
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>
> 2011/12/23 Imran Ali <immrccie_at_gmail.com>:
> > hI
> >
> > Does the caching RP in MSDP must be a peer RPF neighbor to the RP sending
> > SA request messages ?
> >
> > can a non rpf peer in msdp act like a caching RP ??
> >
> >
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Received on Fri Dec 23 2011 - 20:53:53 ART