Re: PIM DR vs IGMP Querier

Lab it ..

On Mon, Jun 14, 2010 at 11:11 PM, karim jamali <karim.jamali_at_gmail.com>wrote:

> Hi Jorge,
>
> DR is a PIM function relevant to SM, used to elect a router on a multi
> access network responsible for sending register
> /prune messages toward the RP
> Election based on
> 1)Highest Priority
> 2)Highest IP address
>
> IGMP Querying Router is the router on a multi access network that is
> responsible for sending IGMP host queries
> Election:
> The router with the lowest IP address is elected
>
> PIM Assert:on a multi access network where two or more routers exist the
> decision on who will forward the multicast packets on the segment is based
> on the election of a forwarder:
> -Admin Distance of the routers to the group source (lowest wins)
> -Routing Protocol metric to the group source (lowest wins)
> -Router with the highest IP address wins.
>
> Hope this helps!
>
> Best Regards,
>
> On Mon, Jun 14, 2010 at 7:08 PM, Jorge Cortes
> <jorge.cortes.cano_at_gmail.com>wrote:
>
> > Hi,
> >
> > Thank you all for looking at this.
> >
> > This is getting more confusing, so let's try to clear things up.
> >
> > When the senders are on a shared media and there is more than one
> multicast
> > capable router on the segment, the router that will register the source
> or
> > sources with the RP is the DR, which, by default is the router with the
> > highest IP address on the segment. There is no Assert procedure on the
> > segment where there are only senders located. Assert only takes place for
> > shared segments where there are receivers located -note there can be
> > senders
> > as well.
> >
> > Now, the confusion arises on shared segments where there are receivers.
> In
> > a
> > previous mail you said:
> >
> > "The one who receive IGMP messeges and send the join message towards RP
> > (signalling) is always the same router. "
> >
> > Hosts signal IGMP messages asynchronously, and all multicast capable
> > routers
> > on the segment process these messages and respond to these messages at
> the
> > beginning, thus IGMP Querier election process needs to take place as well
> > as
> > PIM DR election process. However both election processes use different
> > criteria. IGMP Querier uses lowest IP address and PIM DR uses highest IP
> > address, this is why without any parameter modification (i.e. altering
> > priorities) the PIM DR and the IGMP Querier cannot be the same router.
> >
> > Now, back to my original doubt, is it true that both the PIM DR and IGMP
> > Querier help receivers build RPT trees towards the RP? Or is it just the
> > PIM
> > DR who can do this?
> > If both PIM DR and IGMP Querier can signal RPT Trees towards the RP and
> > these two are different routers, how is this ultimately handled? Will
> > multicast traffic from sources be initially sent to both the PIM DR and
> > IGMP
> > Querier? Then both routers will forward this multicast traffic on to the
> > shared segment forcing assert procedure to take place and finally the
> > assert
> > loser will prune its LAN interface from the OIL?
> >
> > Is this the correct order of operations?
> >
> >
> > Thanks!
> > Jorge
> >
> > On Sun, Jun 13, 2010 at 10:25 AM, <kebramccie_at_gmail.com> wrote:
> >
> > > Outgoing interface list and incoming interface list I guess
> > > Sent from my BlackBerry wireless device from MTN
> > >
> > > -----Original Message-----
> > > From: F H <sol3a1_at_gmail.com>
> > > Sender: nobody_at_groupstudy.com
> > > Date: Sun, 13 Jun 2010 10:57:44
> > > To: Cisco certification<ccielab_at_groupstudy.com>
> > > Reply-To: F H <sol3a1_at_gmail.com>
> > > Subject: 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
> > > > >> >
> > > > >> >
> > > >
> _______________________________________________________________________
> > > > >> > Subscription information may be found at:
> > > > >> > http://www.groupstudy.com/list/CCIELab.html
> > > > >> >
> > > > >> >
> > > > >> >
> > > > >> >
> > > > >> >
> > > > >> >
> > > > >> >
> > > > >> >
> > > > >>
> > > > >>
> > > > >> --
> > > > >> Regards,
> > > > >> Masroor Ali
> > > > >>
> > > > >>
> > > > >> Blogs and organic groups at http://www.ccie.net
> > > > >>
> > > > >>
> > > _______________________________________________________________________
> > > > >> Subscription information may be found at:
> > > > >> http://www.groupstudy.com/list/CCIELab.html
> > > > >>
> > > > >>
> > > > >>
> > > > >>
> > > > >>
> > > > >>
> > > > >>
> > > > >>
> > > > >
> > > >
> > > >
> > > > --
> > > > Regards,
> > > > Masroor Ali
> > > >
> > > >
> > > > Blogs and organic groups at http://www.ccie.net
> > > >
> > > >
> _______________________________________________________________________
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>
> --
> KJ
>
>
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Received on Tue Jun 15 2010 - 10:45:27 ART