Multicast-mtrace command

[TekashiSixNine]

Hello, my question is : I have mpls l3 vpn and multicast over it. Everything is working. When I issue the ping command on one of the CE routers to one of the groups I am receiving a reply from the other router in the group. I want to trace this route. I used the mtrace command but something is wrong maybe I don't know how to use it. I am doing mtrace from my C1's IP address to C2's IP address issued on C1.

[Flavio Miranda]

Hi

  The source of the mtrace command must be "multicast-capable" source.Does this C1 is a multicast source?

source	DNS name or the IP address of the multicast-capable source. This is a unicast address of the beginning of the path to be traced.
destination	(Optional) DNS name or address of the unicast destination. If omitted,  the mtrace starts from the system at which the command is typed.
group	(Optional) DNS name or multicast address of the group to be traced.  Default address is 224.2.0.1 (the group used for MBONE Audio). When  address 0.0.0.0 is used, the software invokes a weak mtrace. A weak mtrace is one that follows the RPF path to the source, regardless of whether  any router along the path has multicast routing table state.

[TekashiSixNine]

All CE routers have IGMP and PIM spars-dense mode. My PE routers have PIM sparse-mode and default-mdt. One of my PE routers is RP