From: dusth@comcast.net
Date: Fri Sep 02 2005 - 19:04:46 GMT-3
Duong,
Do you have mapping agent configure anywhere? If r2 is configured as the mapping agent, problem will fix. However, if either R1 or R3 configure as mapping agent, you will have a problem on spoke routers communication. R2 serial interface will not advertise the mulitcast packet out on the same interface to other spoke when it receives on one spoke - like split horizon in RIP and EIGRP.
Hope this help.
Dustin
-------------- Original message --------------
> Duongla,
>
> there is a good link similar with the one you test on CiscoDOC :
> http://www.cisco.com/univercd/cc/td/doc/cisintwk/intsolns/mcst_sol/frm_rlay.htm
>
> I also test this one a while ago.
> but I am not sure which one is more correct if it's in the Lab Environment.
> To config it (ip pim nbma-mode) or leave it default.
>
> any comment guys ?
>
> Thanks
>
> Rgds,
> Thomwin
>
>
> duongla@vnn.vn wrote:
> Hi group,
>
> I have tried the following scenario on 4 Cisco 2600:
> R1,R2 and R3 are connected via multipoint frame-relay (physical interface), R2
> is the HUB.
> Routing is running normally, all routers can reach all subnets.
> R2 f0/0 connect to R4 whichs is a test router, responsible for genarating
> multcast traffic.
> R1,R2,R3 are all configured with multicast PIM sparse mode and loopback
> interface of R3
> is configured manually on 3 routers as RP.
> R1f0/0 and R3 f0/0 are configured to join group 239.1.1.1
> Before PING 239.1.1.1 from R4, the mroute tables int 3 router are in normal
> state:
> R1,R3 send Join msg to RP which is R2, so R2 has a (*,239.1.1.1) entry in its
> mroute table.
> For first PING 239.1.1.1 from R4, both R1 and R3 reply.
> From second PING, just R3 replies.
> Do debug ip mpacket fastswitch 239.1.1.1, I saw R2 forwarded the mcast packet
> from R4 out serial0/0
> (the frame relay port, connecting to R1 and R3) but just R3 got the packet and
> sent PING echo-reply.
> One interesting notice is: router with higher IP address of frame relay
> interface receives the PING mcast packet.
> In this case R3.
> If I turn off fast switching on R2 s0/0 then both R1 and R3 receive mcast
> packet.
>
> Can anyone help clarify the above behaviour ?
> Thanks in advance.
> Duongla
>
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