Re: PIM DR vs IGMP Querier

Please forgive my ignorance, but what are the terms IIL and OIL?

Thanks

On Sun, Jun 13, 2010 at 10:21 AM, masroor ali <masror.ali_at_gmail.com> wrote:

> As per my understanding about these terms, DR is the one who signals
> towards
> to RP so that RPT build (R2), and the assert forwarder would be R4 or R5.
> because the traffic is moving from sender---> R4/R5--->RP---->R2---->G1,
> and
> the router who unicast the multicast traffic to RP is the assert forworder
> (if AD is low,metric is low,or higest IP address in that segment),
>
> On Sun, Jun 13, 2010 at 6:47 PM, Muzammil Malick <malickmuz_at_gmail.com
> >wrote:
>
> > Masroor.
> >
> > Would you also agree that R1 and R2 also send PIM Assert messages to each
> > other to decide who is the Designated Forwarder TO the receiver?
> >
> >
> > On 12 June 2010 12:32, masroor ali <masror.ali_at_gmail.com> wrote:
> >
> >> Hi,
> >>
> >> G1(receiver)(Multicast group)
> >> |
> >> |
> >> ---------------------------------
> >> | |
> >> |(192.168.1.1) | f0/0 (OIL)
> >> R1 R2 (192.168.1.2)
> >> | | f0/1 (IIL)
> >> --------------------------------
> >> |
> >> |
> >> R3 (RP)
> >> |
> >> |
> >> ---------------------------------
> >> | |
> >> | |
> >> R4 R5
> >> | |
> >> --------------------------------
> >> |
> >> |
> >> source(S1)(sender)
> >>
> >>
> >> lets assume G1 is the IGMP group, who wants to receive the multicast
> >> traffic. G1 1st send the IGMP host membership to join the group(which is
> >> also called signaling).As there are multiple routers R1, R2 in the
> >> segment,
> >> DR election process occur, the heighest IP address router (R2) wins and
> >> create OIL(f0/0) . the DR (R2) send a join messege to RP, RP recieve the
> >> jon
> >> messege, in this way RPT occur.
> >> note that untill the multicast reciver G1 signal nothing would happen.
> >>
> >> This is one part of the story. ((G1) IGMP reciever ---------> RP)
> >>
> >> The second part remains to discuss. ((S1)source------------> RP)
> >>
> >> The first hop route (R4, R5) encapsulate the multicast traffic into
> >> register
> >> message and unicast to RP, here two routers are the first-hop routers,
> now
> >> the PIM-assert come into play and now 1st check the AD, then metric,
> then
> >> heighest router IP become the forwarder and unicast the encapsulated
> >> multicast traffic into the register message to RP. then RP
> de-encapsulate
> >> the register message and forward to reciever.
> >>
> >> note: The 1st hop router keep on encapsulating the packet unless the RP
> >> send
> >> a register-stop message.
> >>
> >>
> >>
> >> On Thu, Jun 10, 2010 at 10:33 PM, Jorge Cortes
> >> <jorge.cortes.cano_at_gmail.com>wrote:
> >>
> >> > I apologize I hit send button before finishing with the email.
> >> >
> >> > Although both protocols are used for different purposes, it is my
> >> > understanding that both, PIM DR and IGMP Querier, can signal SPT
> Trees
> >> > on behalf of the multicast receivers on a shared medium when PIM SM
> >> > is in use. Is this
> >> > correct?
> >> >
> >> > If this is correct, the following question arises. Lets assume the
> >> > following scenario
> >> >
> >> >
> >> >
> >> > ------------------------------
> >> > | |
> >> > R1 R2
> >> > \ /
> >> > \ /
> >> > \ /
> >> > \ /
> >> > \ /
> >> > \ /
> >> > RP
> >> >
> >> > If all IGMP and PIM parameters are left to the default, one of this
> >> > routers will become the IGMP Querier, lets say R1, and the other one
> >> > will become the PIM DR, lets say R2, so both will signal the SPT Trees
> >> > for the groups on the shared segment. Since both routers signaled the
> >> > SPT Tree, then both routers will forward the same multicast data on
> >> > the segment and the assert procedure will take place. Assuming R2 has
> >> > a better metric to the source it will become the assert winner and R1
> >> > will prune its LAN interface from the OIL.
> >> >
> >> > Is this understanding correct?
> >> > Am I missing anything here?
> >> >
> >> > I appreciate your inputs.
> >> >
> >> > Thanks,
> >> > Jorge
> >> >
> >> >
> >> > Blogs and organic groups at http://www.ccie.net
> >> >
> >> >
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> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >>
> >>
> >> --
> >> Regards,
> >> Masroor Ali
> >>
> >>
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> >>
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> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
>
>
> --
> Regards,
> Masroor Ali
>
>
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>
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Received on Sun Jun 13 2010 - 10:57:44 ART