From: Ovidiu Neghina (o.neghina@gmail.com)
Date: Sun May 27 2007 - 12:23:54 ART
Hi
I just tested it . The scenario was about the hub having point to point
links to each of the spokes with one of the spokes being RP and MA. It works
without ip pim nbma-mode . The hub receives the multicast traffic from MA on
one p-t-p link and fwd to the other p-t-p link . This if we have ip pim
autorp listener on every router.
ip pim nbma mode is needed only if we have physical or multipoint interface
on the hub.
Please correct me if I am wrong .
On 5/27/07, Prashant Shukla <shukla_cisco@yahoo.co.in> wrote:
>
>
> Ovidiu,
>
> In a typical Hub-n-spoke topology, if the spoke is the RPor MA , then
> other spoke cannot recieve the MA announcements as MA uses dense-mode for
> announcements which will not be sent across by the HUB router as it will not
> send any multicast traffic back to the interface from where it recvd it.
>
> The solution is to have a tunnel between the 2 spokes and to add a static
> mroute to allow MA advertisements from the other spoke.
>
> u can use " ip pim nbma-mode" on hub to allow sparse mode traffic to flow
> across.
>
> HTH.
>
> Shukla.
>
> *Ovidiu Neghina <o.neghina@gmail.com>* wrote:
>
> Hi dear all
> I have a situation where a router R1 has 2 point-to-point frame-relay
> interfaces towards another 2 routers. One of them is RP and Mapping agent
> (R2) for 224.1.1.1/32 .
> The problem that I have is R1 does not forward the mapping information
> towards the other router R3 , i.e. does not forward the 224.0.1.40 on the
> point-to-point link.
> every router is configured with sparse-mode on the interfaces.
> Is this normal ? Shouldn't packets destined to 224.0.1.40 be sent
> everywhere interface/subinterface where it has a pim neighbor ?
>
> Thank you
> Ovidiu
>
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