Re: Multicast issue in NBMA

Not used gns but stick with 7200's

Who is the DR of the pim segment, neighbours are up right?

Where are you issuing the pings from? Check your OILS are not null, debug ip
mpacket whilst you have long pings running (take off ip mroute-cache off the
interfaces where pim is enabled)

You need to see mforwards, or looks through the path for P flags could be rpf
related without further information I can't be sure.....

What RP type have you gone for?

--
BR
Tony
Sent from my iPhone on 3
On 4 Jul 2013, at 19:04, Taio Bone <taiobtnh_at_gmail.com> wrote:
> Thanks Tony for yor reply.
>
> Yes,I have used the "ip pim nbma-mode" command but the hub isn't even
receiving the join messages (before the split horizon even comes into play) to
begin with.
> Also,the SPT tree works just as expected,the problem is with the build up of
the shared tree from the receiver uo to the RP.
>
> Maybe I should mention that I'm doing this on GNS..Don't know if this might
be a GNS issue.
>
>
>
> On Thu, Jul 4, 2013 at 6:56 PM, Tony Singh <mothafungla_at_gmail.com> wrote:
> Have you enabled "ip pim nbma-mode" on the hub? I'd imagine we need to get
past the split-horizon like behaviour in order to register with the RP, the RP
will then be cut out of the path due to SPT optimisation depending on where
you issue the pings from... another alternative is to create a GRE tunnel
between source and RP to make them think their connected directly.
>
> --
> BR
>
> Tony
>
> Sent from my iPhone on 3
>
> On 4 Jul 2013, at 18:43, Taio Bone <taiobtnh_at_gmail.com> wrote:
>
> > Hello expert. I'm having a challenge with a certain scenario. Say we have
3
> > routers(R1,R2 and R3) with R1 as the hub (in a frame relay network with
> > ospf  network type "BROADCAST") while R2 and R3 are spoke routers.
> >
> > All interfaces are in sparse mode. Now,I have a host behind R2 trying to
> > join a multicast group whose RP is on the loopback(3.3.3.3/32) of the
other
> > spoke router,R3.
> >
> > Now,the issue I'm encountering is that R2 gets the join message and has
an
> > entry for (*,G) but R1 isn't getting the join message neither does it
have
> > an entry for (*,G).
> >
> > You assume all the routers are connected to the FRS using their Serial1/0
> > with IP addresses 10.10.10.(1,2,3) for R1,R2 and R3 respectively.
> >
> > What I'm assuming might be the problem is that fact that the next hop and
> > RPF neighbor indicated on R2 for the RP address  is 10.10.10.3..Now this
is
> > expected since it's an OSPF "broadcast" network type and they are all in
> > the same broadcast domain.
> >
> > P.S Each spoke router has a frame-relay map statements to both the hub
and
> > the spoke routers.
> >
> > Thank you.
> >
> >
> >
> >
> > --
> > Warm wishes,
> >
> > Ty.
> >
> >
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> >
> >
> >
> >
> >
>
>
>
> --
> Warm wishes,
>
> Ty.
Blogs and organic groups at http://www.ccie.net