From: ccie2be (ccie2be@nyc.rr.com)
Date: Fri Sep 05 2003 - 12:37:58 GMT-3
Thanks for that clarification.
----- Original Message -----
From: "Jeff Wishnew" <jwishnew@comcast.net>
To: "ccie2be" <ccie2be@nyc.rr.com>; "Group Study" <ccielab@groupstudy.com>;
"Roger McNeace" <rmcneace@terremark.com>
Sent: Friday, September 05, 2003 10:31 AM
Subject: Re: PIM-Sparse vs Sparse-Dense
> That's not entirely accurate. Sparse-Dense enables the multicast routers
to
> find the RPs via Auto-RP. The candidate RPs multicast out their intent to
> become an RP for particular groups. The Mapping Agents listen for the
> announcements and then multicast out the Group-to-RP mappings. All PIM
> Sparse-Dense routers will listen for the Mapping Agent's Group-to-RP
mapping
> announcements.
>
> On the other hand, BSR uses hop-by-hop broadcast to send out the
Group-to-RP
> mappings. Therefore, you can use strictly Sparse mode when using BSR.
>
> Jeff Wishnew
> CCIE #12148
>
>
> ----- Original Message -----
> From: "ccie2be" <ccie2be@nyc.rr.com>
> To: "Group Study" <ccielab@groupstudy.com>; "Roger McNeace"
> <rmcneace@terremark.com>
> Sent: Friday, September 05, 2003 9:26 AM
> Subject: Re: PIM-Sparse vs Sparse-Dense
>
>
> > The sparse-dense mode, as I understand it, is so that all the multicast
> > routers find out who the RP's are automatically via either Auto-RP or
BSR.
> > If the routers are only sparse mode, then you have to manually configure
> the
> > address(es) of the RP's on each router.
> >
> > For further info, see either Beau Williamson book, Developing IP
Multicast
> > Networks, Chapter 12 or Dolye's Routing TCP/IP volume II.
> >
> > HTH, dt
> >
> > ----- Original Message -----
> > From: "Roger McNeace" <rmcneace@terremark.com>
> > To: <ccielab@groupstudy.com>
> > Sent: Friday, September 05, 2003 9:27 AM
> > Subject: PIM-Sparse vs Sparse-Dense
> >
> >
> > > As I understand it by default on Cisco routers PIM-Sparse mode will
> > > automatically switchover to a SPT (dense mode) to a source since the
> > > threshold is set to 0. Why and when would I need Sparse-Dense if
Sparse
> > > alone does the same thing?
> > >
> > >
> > >
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