# Enabling IP Multicast

In this implementation, IP multicast works on virtual routers (VRs). By default, IP multicast is disabled on a VR. To enable IP multicast on a VR, access the context for a VR, and then issue the ip multicast-routing command.

ip multicast-routing

- Use to enable IP multicast routing on the VR.
- By default, IP multicast is disabled on the VR. In the disabled state, all multicast protocols are disabled, and the VR forwards no multicast packets.
- Example
  host1(config)#ip multicast-routing
- Use the no version to disable IP multicast routing on the VR (the default).
- See ip multicast-routing.