The switch is a 3750e. It runs the latest IOS version 12.2(55)SE/universal (ip services). Multicast routing has been enabled, but I cannot enable multicast/pim on any SVI in configuration mode. PIM sparse or dense modes are not allowed, they are not there. "ip pim passive" is the only option that I have. But I can enable multicast without an issue under any other L3 interface (no switchport) on the same switch. What am I missing? Thank you very much!