From: Edison Ortiz (edisonmortiz@gmail.com)
Date: Sun May 27 2007 - 12:24:06 ART
This is not a typical hub-spoke configuration. He mentioned he has two
point-to-point connections from the hub to the spokes.
The hub did not have a multi-point frame-relay. His problem was due to the
auto-rp groups not being advertised to other routers.
When running sparse-mode on the interface, you need to use the auto-rp
listener command since the auto-rp groups only run in dense mode.
__
Edison Ortiz
(Routing & Switching, CCIE # 17943)
----- Original Message -----
From: "Prashant Shukla" <shukla_cisco@yahoo.co.in>
To: "Ovidiu Neghina" <o.neghina@gmail.com>; "Cisco certification"
<ccielab@groupstudy.com>
Sent: Sunday, May 27, 2007 11:05 AM
Subject: Re: multicast pim sparse mode
> 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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