I feel like I'm the beginning of something new and it's the matter of how good we CCIE Security have to know multicast. I would go for the second scenario that Warrick suggested but being stubborn I'd like to make it the easy way, the way it worked in that Lab 17 and How it described in this Cisco doc: http://www.cisco.com/en/US/tech/tk828/technologies_configuration_example09186a00801a5aa2.shtml Once again to refresh, R1 and R2 have GRE tunnel. I tried to source it with physical and loopback interfaces, same results.
On R1 (KS) (interface and multicast relevant sections) Ip multicast-routing ! interface Loopback0 ip address 1.1.1.1 255.255.255.0 ip pim sparse-mode ! interface Tunnel126 ip address 10.10.10.1 255.255.255.0 ip pim sparse-mode tunnel source FastEthernet0/0 tunnel destination 192.168.5.2 R2 (GM) Ip multicast-routing ip pim rp-address 1.1.1.1 ! interface Loopback0 ip address 2.2.2.2 255.255.255.0 ip pim sparse-mode ! interface Tunnel126 ip address 10.10.10.2 255.255.255.0 ip pim sparse-mode tunnel source FastEthernet0/0 Then goes this something that I don't understand. As you see I don't have RP announced on R1 and I'm having the following error messages on R1 console: *Aug 7 17:14:54.940: %PIM-6-INVALID_RP_JOIN: Received (*, 224.0.1.40) Join from 10.10.10.2 for invalid RP 1.1.1.1 But on R2 I do have a static multicast route defined like this: R2(config-if)#do sh run | sec mroute ip mroute 1.1.1.1 255.255.255.255 Tunnel126 Ok, I removed this route and the error message is gone and then silence. I don't see any joins on the GM and no mroutes R2(config)#do sh ip igmp group IGMP Connected Group Membership Group Address Interface Uptime Expires Last Reporter Group Accounted 239.1.1.254 Serial0/0/0 16:06:00 stopped 192.168.23.2 239.0.0.1 Serial0/0/0 13:34:58 stopped 192.168.23.6 224.0.1.40 Tunnel126 14:31:13 stopped 10.10.10.2 R2(config)#do sh ip mroute (*, 224.0.1.40), 14:38:18/stopped, RP 1.1.1.1, flags: SJPCL Incoming interface: Null, RPF nbr 0.0.0.0, Mroute Outgoing interface list: Null
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