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

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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Received on Wed Aug 26 2009 - 00:03:27 ART