From: shiran guez (shiranp3@gmail.com)
Date: Sat Jan 05 2008 - 07:29:42 ARST
from RFC 2362:
*'When a DR (e.g., router A in figure 1) gets a membership indication
from IGMP for a new group, G, the DR looks up the associated RP. The
DR creates a wildcard multicast route entry for the group, referred
to here as a (*,G) entry; if there is no more specific match for a
particular source, the packet will be forwarded according to this
entry."
*it is not the location of the DR as long as it reachable!
Side Note: there is no sparse-dense mode it is only saying that the
interface can be either sparse or dense
there is no both sparse and dense!!!
if a group have a RP then it is sparse if not then it is Dense and it
is flooding out all interfaces configured.
On Jan 5, 2008 8:50 AM, Monica Belluci <mpls1979@gmail.com> wrote:
> Thanks Bob
>
> One more question . does it has any role in sparse mode or sparse-dense
> mode
> ?
>
> Nalini Roy
>
> On Jan 4, 2008 8:46 PM, Bob Sinclair <bob@bobsinclair.net> wrote:
>
> > Monica Belluci wrote:
> > > Hi,
> > >
> > > If I increase dr-priority of router in Multicasting by using ip pim
> > > dr-priority command, What action(Job responsibility) will be taken by
> DR
> > in
> > > multicasting ?
> > > If Edge router become DR in Multicast network , Will it effect the
> flow
> > of
> > > multicast traffic ?
> > > Your comments are appereciable for me.
> > >
> > Here are some PIM DR facts:
> >
> > By default, the router with the highest interface IP address on a
> > subnet will be the PIM Designated Router.
> >
> > Highest IP on the subnet can be overridden ip pim dr-priority X
> > (default 1, higher preferred)
> >
> > In Sparse mode, the DR on the subnet sends *,G join and register
> > messages.
> >
> > With equal metrics to the source, the DR will be the forwarder for
> > the subnet, even if not highest IP.
> >
> > With equal metrics, the upstream neighbor with the highest IP will be
> > the rpf neighbor, even if it is not DR.
> >
> > Hth,
> >
> > --
> >
> >
> > Bob Sinclair CCIE 10427 CCSI 30427
> > www.netmasterclass.net
>
> _______________________________________________________________________
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-- Shiran Guez MCSE CCNP NCE1 http://cciep3.blogspot.com http://www.linkedin.com/in/cciep3
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