From: Chris Lewis (chrlewiscsco@gmail.com)
Date: Sun Jan 22 2006 - 15:22:40 GMT-3
Regarding ip dm-fallback.
The default behavior for a router (regardless of interface pim mode
configuration), is to decide that if an RP cannot be found for a particular
group, it will treat this group as dense. If you have the interfaces on the
router configured as sparse-dense, this will enable the router to use sparse
for the groups that it knows an RP for, and dense for the rest. If the
interfaces are set to sparse only, the router will still consider groups
that it does not know an RP for as dense, but will not be able to flood the
dense mode information due to the interface configuration.
The downside to the sparse-dense mode is that if something bad happens to
the RP or RPs, all groups will become dense and that could be catastrophic
for a netork with a lot of multicast goups, so no ip dm-pim fallback allows
you to use sparse-dense mode more safely in that instance.
Chris
On 1/22/06, Victor Cappuccio <cvictor@protokolgroup.com> wrote:
>
> I'm not sure about the no ip pim dm-fallback, but the ip
> pim spt-threshold infinity prevents the DR in a Sparse Mode configuration
> to
> switch to the SPT to the source.
>
>
>
> -----Mensaje original-----
> De: de Witt, Duane [mailto:duane.dewitt@siemens.com]
> Enviado el: domingo, 22 de enero de 2006 6:05
> Para: Jonathan Stevens; Chris Lewis
> CC: Victor Cappuccio; Rionando@swadharma.com; ccielab@groupstudy.com;
> Mohammed Shameen Abdul Jabbar; Gustavo Novais; nobody@groupstudy.com
> Asunto: RE: Multicast : Auto RP with PIM NBMA mode
>
> Hi All
>
> That command is spot on if I remember correctly. While we're on this
> subject what are the differences between 'no ip pim dm-fallback' and 'ip
> pim spt-threshold infinity' ??
>
> -----Original Message-----
> From: Jonathan Stevens [mailto:jonathanstevens.net@googlemail.com]
> Sent: 22 January 2006 11:54 AM
> To: Chris Lewis
> Cc: Victor Cappuccio; Rionando@swadharma.com; ccielab@groupstudy.com;
> Mohammed Shameen Abdul Jabbar; de Witt, Duane; Gustavo Novais;
> nobody@groupstudy.com
> Subject: Re: Multicast : Auto RP with PIM NBMA mode
>
> One last thought is that with Auto-RP and sparse mode is that I think it
>
> is a good idea to configure no ip pim dm-fallback (I can't remember the
> exact command but it's close to that).
>
>
> Chris Lewis wrote:
>
> >Rionando,
> >
> >You have the right configuration and it is allowed, the message you see
> is
> >just a warning that nbma-mode does nothing for dense mode operations.
> >However, it does help when sparse is operating for the group.
> >
> >Chris
> >
> >
> >On 1/21/06, Victor Cappuccio <cvictor@protokolgroup.com> wrote:
> >
> >
> >>Hello, I must admit that Multicast is not my strong, but logics tells
> me
> >>that is you want to separate the Outgoing List Interface using Dense
> mode,
> >>then a solution with Gre Tunnels would be the right choice..
> >>Any opinion about this please
> >>Thanks
> >>
> >>
> >>-----Mensaje original-----
> >>De: nobody@groupstudy.com [mailto:nobody@groupstudy.com] En nombre de
> >>Rionando@swadharma.com
> >>Enviado el: viernes, 20 de enero de 2006 3:18
> >>Para: Victor Cappuccio
> >>CC: ccielab@groupstudy.com; 'Mohammed Shameen Abdul Jabbar'; 'de Witt,
> >>Duane'; 'Gustavo Novais'; nobody@groupstudy.com;
> Rionando@swadharma.com
> >>Asunto: RE: Multicast : Auto RP with PIM NBMA mode
> >>
> >>Hi all,
> >>Yup, there is in Hub and Spoke topology,
> >>
> >>R1--------
> >> |
> >> R2----R4
> >> |
> >>R3-----
> >>
> >>
> >>R1,R2,R3 F/R hub and Spoke, R1 & R3 Spoke, R2 Hub (All Physical
> interface)
> >>R2 as RP with auto rp,
> >>R4 as RP mapping agent
> >>
> >>When I use IP PIM sparse mode with IP PIM nbma mode on R2, R1 and R3
> do
> >>not receive RP discover from R4.
> >>When I use IP PIM sparse-dense mode with IP PIM nbma modon R2, Router
> said
> >>: "PIM nbma-mode is not recommended for sparse-dense-mode", but with
> this
> >>configuration it running well, R1 and R3 receive RP discover from R4.
> >>The question is, Using PIM Sparse-dense mode or dense mode with IP PIM
> nbm
> >>mode is allowed or not allowed ?
> >>
> >>
> >>Yoshe Rionando Y.
> >>PT. Swadharma Duta Data
> >>Network System Dept.
> >>Network System Engineer
> >>phone : 62 21 8318881
> >>fax : 62 21 8297293
> >>mobile : 62 8159084895
> >>
> >>
> >>
> >>
> >>"Victor Cappuccio" <cvictor@protokolgroup.com>
> >>Sent by: nobody@groupstudy.com
> >>01/20/2006 12:34 PM
> >>Please respond to
> >>"Victor Cappuccio" <cvictor@protokolgroup.com>
> >>
> >>
> >>To
> >>"'Mohammed Shameen Abdul Jabbar'" <ccie.xpert@gmail.com>, "'Gustavo
> >>Novais'" <gustavo.novais@novabase.pt>
> >>cc
> >>"'de Witt, Duane'" <duane.dewitt@siemens.com>,
> <Rionando@swadharma.com>,
> >><ccielab@groupstudy.com>
> >>Subject
> >>RE: Multicast : Auto RP with PIM NBMA mode
> >>
> >>
> >>
> >>
> >>
> >>
> >>Please sorry the SPAM
> >>
> >>
> >>
> >>
> >http://www.cisco.com/en/US/tech/tk828/technologies_white_paper09186a008
> 00d6b
> >
> >
> >>61.shtml#xtocid5
> >>
> >>
> >>-----Mensaje original-----
> >>De: Victor Cappuccio [mailto:cvictor@protokolgroup.com]
> >>Enviado el: viernes, 20 de enero de 2006 1:34
> >>Para: 'Mohammed Shameen Abdul Jabbar'; 'Gustavo Novais'
> >>CC: 'de Witt, Duane'; 'Rionando@swadharma.com';
> 'ccielab@groupstudy.com'
> >>Asunto: RE: Multicast : Auto RP with PIM NBMA mode
> >>
> >>In a HUB and Spoke Topology??
> >>Ip pim nbma could help here?
> >>
> >>
> >>-----Mensaje original-----
> >>De: nobody@groupstudy.com [mailto:nobody@groupstudy.com] En nombre de
> >>Mohammed Shameen Abdul Jabbar
> >>Enviado el: viernes, 20 de enero de 2006 1:23
> >>Para: Gustavo Novais
> >>CC: de Witt, Duane; Rionando@swadharma.com; ccielab@groupstudy.com
> >>Asunto: Re: Multicast : Auto RP with PIM NBMA mode
> >>
> >>Hi,
> >>
> >>I would like to know what are the problems that is encountered when
> >>configuring PIM NBMA on frame-relay on Auto-RP.
> >>
> >>regards
> >>Shamin
> >>
> >>
> >>On 1/12/06, Gustavo Novais <gustavo.novais@novabase.pt> wrote:
> >>
> >>
> >>>Hi
> >>>
> >>>See the comand ip pim auto-rp listener.
> >>>
> >>>It will enable auto-rp groups (224.0.1.39 and 224.0.1.40) be dense
> >>>flooded even if you only have sparse-mode configured.
> >>>
> >>>HTH
> >>>
> >>>Gustavo Novais
> >>>
> >>>
> >>>-----Original Message-----
> >>>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
> >>>de Witt, Duane
> >>>Sent: quinta-feira, 12 de Janeiro de 2006 8:09
> >>>To: Rionando@swadharma.com; ccielab@groupstudy.com
> >>>Subject: RE: Multicast : Auto RP with PIM NBMA mode
> >>>
> >>>Maybe this can help:
> >>>
> >>>Choosing a Default RP
> >>>Sparse mode environments need a default RP; sparse-dense mode
> >>>environments do not. If you have sparse-dense mode configured
> >>>everywhere, you need not choose a default RP.
> >>>
> >>>Adding Auto-RP to a sparse mode cloud requires a default RP. In an
> >>>existing PIM sparse mode region, at least one RP is defined across
> the
> >>>network that has good connectivity and availability. That is, the ip
> pim
> >>>rp-address command is already configured on all routers in this
> network.
> >>>
> >>>
> >>>Use that RP for the global groups (for example, 224.x.x.x and other
> >>>global groups). There is no need to reconfigure the group address
> range
> >>>that RP serves. RPs discovered dynamically through Auto-RP take
> >>>precedence over statically configured RPs. Assume it is desirable to
> use
> >>>a second RP for the local groups.
> >>>
> >>>-----Original Message-----
> >>>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
> >>>Rionando@swadharma.com
> >>>Sent: 12 January 2006 04:44 AM
> >>>To: ccielab@groupstudy.com
> >>>Subject: Multicast : Auto RP with PIM NBMA mode
> >>>
> >>>Hi Guys,
> >>>I have a problem Auto RP with PIM NBMA mode in frame-relay. Since
> auto
> >>>
> >>>RP need Dense mode to learned and the other side PIM NBMA mode do
> not
> >>>recomended Dense mode to operate.
> >>>Any suggestion ?
> >>>
> >>>
> >>>
> >>>
> >>>Yoshe Rionando Y.
> >>>
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> >>>
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