From: hong tony (aamercado31@xxxxxxxxx)
Date: Thu May 16 2002 - 04:48:39 GMT-3
I believe this is a normal pruning action:
With Dense mode, I am assuming RA has the highest ip
and became the DR (designated router) btwn RA and RB.
RB would prune back and hence you would not be able to
ping 239.1.1.1.
See (watch wrap):
http://www.cisco.com/univercd/cc/td/doc/cisintwk/idg4/nd2024.htm#xtocid5
Here's a snippet:
Dense-mode PIM uses a technique known as reverse path
forwarding. When a router receives a packet, it sends
the packet out all interfaces except the interface on
which the packet was received. Reverse path forwarding
allows a data stream to reach all LANs, possibly
multiple times. If the router has interfaces for which
no hosts are members of the multicast group for which
the packet is intended or for which no downstream
multicast router on that LAN has joined the group, the
router sends a prune message up the distribution tree
to inform the sender that it need not send subsequent
packets for this multicast group.
HTH
--- elpingu <elping@acedsl.com> wrote:
> if you will be using sparse mode on any router. on
> the router using
> sparse mode
> you must tell it who is the RP.
>
> example
> routerb
> ip pim rp-address x.x.x.x
>
>
>
> Ali Fahmi wrote:
>
> > Hi all,
> > I have a problem with multicast configuration,
> > I have a topology like this, (WAN is Frame relay)
> >
> > RtrA (s0/0.1) ------------RtrB
> > |
> > |
> > (S1/0)
> > RtrC
> > (E0)
> > |
> > RtrD
> >
> > My Problem is,
> > if I used PIM Dense-mode,I can ping 239.1.1.1 from
> RtrA and
> > got reply from RtrD, but I can not ping from RtrB
> > if I used PIM Sparse mode and RtrA is set to
> become RP , my
> > problem is solved,
> > is there any mistake in my config below ?
> >
> > RtrA
> >
> > ip multicast-routing
> >
> > interface s0/0.1
> > ip pim dense-mode
> >
> > RtrB
> > ip multicast-routing
> >
> > interface S0
> > ip pim dense-mode
> >
> > RtrC
> > ip multicast-routing
> >
> > interface s1/0
> > ip pim dense-mode
> >
> > interface E0
> > ip pim dense-mode
> >
> > RtrD
> > ip multicast-routing
> >
> > interface E0
> > ip igmp join-group 239.1.1.1
> >
> > thanks,
> >
> > Ali
> >
>
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