Peter, I don't have time to look at your topology right now but what you are experiencing is due to the switch-over to the source based tree. When you establish a multicast session the first packets come from the RP point, but quickly switches over to be sourced directly from the multicast speaker. What is happening in your case is your RPF check is good from the destination to the RP, but somewhere along the line between the source and destination path there is an RPF failure or you don't have a PIM adjacency.
Hope that helps, Marc On Tue, Jan 22, 2013 at 9:44 PM, Peter Fabian <[email protected]>wrote: > Ok so I'm official stuck > > Trying to complete 5.3 in Vol3 lab7 but seem to be having some intermittent > failures. > > Specifically, multicast pings between MSDP peers seems to fail. I say > seems, because they work pretty reliably the first time, but if I try > subsequent times they fail. > > Right now I am testing from R4 pinging 239.0.0.2 (on R2). R5 and R1 are > setup as MSDP peers. > All routers mentioned above are running sparse-mode > > > Here's a tidbit of output: > > R4#ping 239.0.0.2 > > Type escape sequence to abort. > Sending 1, 100-byte ICMP Echos to 239.0.0.2, timeout is 2 seconds: > > Reply to request 0 from 12.1.2.2, 96 ms > R4#ping 239.0.0.2 > > Type escape sequence to abort. > Sending 1, 100-byte ICMP Echos to 239.0.0.2, timeout is 2 seconds: > . > R4#sho ip mroute 239.0.0.2 > IP Multicast Routing Table > (*, 239.0.0.2), 00:00:17/stopped, RP 45.45.45.5, flags: SPF > Incoming interface: FastEthernet0/1.45, RPF nbr 45.4.5.5 > Outgoing interface list: Null > > (45.45.45.4, 239.0.0.2), 00:00:17/00:02:47, flags: PFT > Incoming interface: Loopback0, RPF nbr 0.0.0.0 > Outgoing interface list: Null > > > R2#sho ip mroute > IP Multicast Routing Table > (*, 239.0.0.2), 11:47:44/stopped, RP 12.12.12.1, flags: SJCLF > Incoming interface: FastEthernet0/0.12, RPF nbr 12.1.2.1 > Outgoing interface list: > Loopback0, Forward/Sparse, 11:47:44/00:02:52 > > (45.45.45.4, 239.0.0.2), 00:03:19/00:00:10, flags: L > Incoming interface: Serial0/1/0.24, RPF nbr 12.45.24.4, Mbgp > Outgoing interface list: > FastEthernet0/0.12, Forward/Sparse, 00:03:20/00:03:22 > Loopback0, Forward/Sparse, 00:03:20/00:02:51 > > (*, 224.0.1.40), 11:49:03/00:02:22, RP 0.0.0.0, flags: DCL > Incoming interface: Null, RPF nbr 0.0.0.0 > Outgoing interface list: > FastEthernet0/0.12, Forward/Sparse, 11:49:03/00:02:22 > > > Any suggestions, or troubleshooting ideas would be appreciated. Thanks > > Peter Fabian | Senior Voice Engineer > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com > > http://onlinestudylist.com/mailman/listinfo/ccie_rs > -- Marc Abel CCIE #35470 (Routing and Switching) _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://onlinestudylist.com/mailman/listinfo/ccie_rs
