It seems nobody has really answered this. To begin with, I agree that you do not need IGMP on the tunnels, only on Ethernet ports where there are possible receivers of the mcast traffic.
In addition, it is not necessary that your SP runs mcast on his router since you are using GRE tunnels. PIM-DM uses SPTs so the moment it starts receiving (S,G) traffic from a mcast source it will send out the traffic to all interfaces on its outgoing interface list. For PIM-DM that is all interfaces that have multicast enabled and have a PIM-DM neighbour or a mcast receiver. So the first thing you need to do is check if you can see your PIM-DM neighbour at the other end of the SP cloud with the "show ip pim neighbor" command. Please keep us posted on how this progresses. Kind regards George Murage -----Original Message----- From: Doan Nguyen [mailto:[EMAIL PROTECTED] Sent: Thursday, August 07, 2003 11:44 PM To: [EMAIL PROTECTED] Subject: Re: Multicasting [7:72403] If you're using PIM Dense-Sparse mode you will need to designate an RP router because the DR needs to know where to send the (*,G) to join and the source DR needs to register the SA messages to the RP. What you can do for this case is R1-----SP1-------SP2-----R2 make either R1 or R2 the RP. Assign a static RP-to-group mapping to the router that is not the RP to point to the one that is assigned the RP. If you're using static RP mapping then all you need on your tunnel interface is PIM-SM. **Please support GroupStudy by purchasing from the GroupStudy Store: http://shop.groupstudy.com FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=73719&t=72403 -------------------------------------------------- **Please support GroupStudy by purchasing from the GroupStudy Store: http://shop.groupstudy.com FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
