From: Kirby, Ron (Ron.Kirby@xxxxxxxxxxxxx)
Date: Fri Jan 04 2002 - 12:44:23 GMT-3
All,
I am working with multicasting over a frame cloud. R1 has a multipoint
subinterface connected to R3 and R4 which are using physical interfaces
(basic hub and spoke design). I am using EIGRP and have split horizon turned
off at the hub (R1). The routing table is fine and everything can be
pinged.
Now, Pim is running on all routers and dense mode on all interfaces. I have
pim neighbor relationships between R1 and R3 and R1 and R4. Here's the
problem. R1 (the hub) has an mroute entry for the multicast source off of
R3 as shown below:
**********************************************
r1#sh ip mroute 234.5.6.7
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, C - Connected, L - Local, P - Pruned
R - RP-bit set, F - Register flag, T - SPT-bit set, J - Join SPT
M - MSDP created entry, X - Proxy Join Timer Running
A - Candidate for MSDP Advertisement
Outgoing interface flags: H - Hardware switched
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 234.5.6.7), 00:12:31/00:02:59, RP 0.0.0.0, flags: D
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Ethernet0/0, Forward/Dense, 00:12:09/00:00:00
Serial0/0.2, Forward/Dense, 00:12:31/00:00:00
Serial0/0.1, Forward/Dense, 00:12:31/00:00:00
(192.168.30.2, 234.5.6.7), 00:02:46/00:00:24, flags: PT
Incoming interface: Serial0/0.2, RPF nbr 131.5.20.3
Outgoing interface list:
Serial0/0.1, Prune/Dense, 00:02:46/00:00:19
Ethernet0/0, Prune/Dense, 00:02:46/00:00:19
***************************************************
As you can see, S0/0.2 is not in the outgoing interface list, and I figure
it is because the router does it's RPF check and finds that the upstream
interface is S0/0.2 and therefore S0/0.2 is not a candidate for flooding the
multicast data. So how do I get the multicast traffic to a host on R4? I
believe my possibilities are a tunnel between R1 and R3 and R1 and R4 for
multicast purposes, or moving to frame-relay P-to-P subinterfaces. I have
also worked with the NBMA mode command, but it doesn't look as if it is
designed for this. Is there a command line solution available?
Thanks
Ron
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