Re: Auto RP with sparse-mode and no dm-fallback..and its

AutoRP with sparse-mode needs the autorp listener command because it was
designed to work with sparse-dense mode.

no dm fallback would be used if you are using sparse-dense mode and wanted
to prevent failing over to dense mode if the RP failed.

Now even with spare-mode the first few packets will be sent in DENSE mode to
set up the autorp then after that they will all be sparse-mode.

On Wed, Aug 26, 2009 at 12:03 AM, <Keegan.Holley_at_sungard.com> wrote:

> auto-rp works without the configuring dense mode. The point of it is to
> allow sparse mode multicast so the routers just listen and flood the 1.39
> and 1.40 groups regardless of whether sparse-dense is configured or not.
> Not sure what you meant by the acl can you elaborate? Like an acl
> blocking the two multicast groups from being accepted via an interface or
> an acl on the rp to prevent a certain group mapping?
>
>
>
>
>
>
> Re: Auto RP with sparse-mode and no dm-fallback..and its working
>
> G2
> to:
> Mohamed El Henawy
> 08/25/09 05:37 PM
>
>
> Sent by:
> nobody_at_groupstudy.com
> Cc:
> Cisco certification
> Please respond to G2
>
>
>
>
>
>
> Mohamed,
>
> Take a look at this:
>
>
> http://www.cisco.com/en/US/docs/ios/12_3t/12_3t4/feature/guide/gtautorp.html
>
>
>
> On Aug 25, 2009, at 11:20 PM, Mohamed El Henawy wrote:
>
> > Hello Nathan ,
> >
> > we put the no dm fallback when we use sparse mode ...as per Cisco ..
> >
> > Benefits of Auto-RP in a PIM Network , step 14
> >
>
> http://www.cisco.com/en/US/docs/ios/ipmulti/configuration/guide/imc_basic_cfg_ps6350_TSD_Products_Configuration_Guide_Chapter.html
>
> >
> > my problem that I have done everything to prevent R3 to know the
> > mapping but yet I find that R3 knows the mapping
> >
> >
> >
> >
> > ----- Original Message ----- From: "Nathan Richie" <nathanr_at_boice.net>
> > To: "Mohamed El Henawy" <m.henawy_at_link.net>; "Cisco certification"
> <ccielab_at_groupstudy.com
> > >
> > Sent: Wednesday, August 26, 2009 12:12 AM
> > Subject: RE: Auto RP with sparse-mode and no dm-fallback..and its
> > working
> >
> >
> > Using "no ip pim dm-fallback" would not have any bearing since you
> > are using sparse mode (you would need sparse-dense mode for this
> > command to have an effect).
> >
> > Have you configured the "ip pim autorp-listener" command? Also
> > which router is your mapping agent?
> >
> > ________________________________________
> > From: nobody_at_groupstudy.com [nobody_at_groupstudy.com] On Behalf Of
> > Mohamed El Henawy [m.henawy_at_link.net]
> > Sent: Tuesday, August 25, 2009 4:09 PM
> > To: Cisco certification
> > Subject: Auto RP with sparse-mode and no dm-fallback..and its working
> >
> > Hello Group ,
> >
> > this might be a silly question but...still I wish to learn
> > how :) ..I'm tired
> > of multicast really
> >
> > I have this setup
> >
> > f0/0--R1----LAN-----R2-----FR-----R3---LAN---R5
> >
> >
> > - I have put ip pim sparse mode on the interfaces
> > - configured auto rp on R2 with specific ACL
> > -put no ip pim dm-fallback on R2 & R3
> > -Join the group I permitted with the ACL on R1 F0/0
> >
> > my question is ....how come ( without any pings from R3 ) I see the
> > rp mapping
> > on R3 & R5 ? if I'm blocking the 39 & 40 groups as I'm using ACL
> > with the RP (
> > correct ? ) and I'm putting no ip pim dm-fallback
> >
> >
> > where is the trick ?
> >
> > Thanks....
> >
> >
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> >
>
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-- 
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