From: George Roman (georgeroman@gmail.com)
Date: Sat Oct 13 2007 - 07:43:04 ART
Hi again,
The problem is solved, it seem that it took some time for the command "ip
pim nbma-mode" to take effect over the mroute table:) now everything is
fine.
Thanks!
On 10/13/07, George Roman <georgeroman@gmail.com> wrote:
>
> Hi group I have this question regarding multicast over frame-relay hub and
> spoke network (i am pretty week at multicast but i am trying to improve so
> please be patient):
>
> Assume that i have 3 routers: R1, R2, R3 with R2 being the the hub of the
> frame relay network and also the RP for my the Multicast group (i am using
> PIM sparse-mode, and over the FR cloud broadcasts/multicasts are allowed, R1
> &R3 connect with R2 via point-to-point subinterfaces, R2 connects to R1&R3
> using the major interface and static FR mapping ). Now i make R3 fast
> ethernet to join my group ( using igmp join group....) and by using the
> source ip address of the fast ethernet interface of router R1 i am trying to
> reach (ping) this group i have just joined on R3.
> The problem is that this group seem to be reachable for 3 or 4 icmps and
> after that it is unreachable.
> I have tried to look in the mroute table of my routers to find out what
> happens there and here is what i observed:
> On R3 RPF check is made on the correct interface (the serial interface),
> but on the ip address of R2; on the routing table on the other hand the path
> to the router's R1 fast ethernet ip address is via R1 directly, which i find
> normal.
>
> Now the question. Is RPF check made only on the interface or does the IP
> address of the reverse path have to match also?
>
> Here is what i have done when trying to resolve my problem:
> -I have tried to enable ip pim nbma-mode on router 2 but no success there.
>
> -I have put a static mroute that should enabe RPF check via the ip address
> of R2 but also without success.
>
>
> What can be the issue and how can i solve this problem?
>
> Thanks for your time,
> George
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