I hope someone can help with this. I have a 2800 receiving multicast feeds off of a VLAN10 with sparse-dense-mode enabled. I have a VLAN1 with sparse-dense-mode enabled that's on the same 2800 router and it is connected to a VLAN1 (using L2 link) on a 6509 (this VLAN1 is configured with 8 ports) with no sparse-dense-mode configured. Multicast streams are being picked up on the clients connected to VLAN1 on the 6509 when sparse-dense-mode is not enabled but as soon as I enter the "ip pim sparse-dense-mode" on the VLAN1 on the 6509, the clients connected on the VLAN1 stop receiving the streams. The reason i need to enable the sparse-dense-mode on the VLAN1 on the 6509 is that I am preparing to route the stream to another network - otherwise, i would leave it disabled. The routing seems fairly simple and snooping is enabled on both VLANs but i cannot get this to function properly. Does anyone have an answer? The 6509 is running IOS.