1-8Enabling IP multicast routing in a VPN instanceFollow these steps to enable IP multicast routing in a VPN instance:To do… Use the command… RemarksEnter system view system-view —Create a VPN instance andenter VPN instance viewip vpn-instancevpn-instance-name —Configure a route distinguisher(RD) for the VPN instanceroute-distinguisherroute-distinguisherRequiredNo RD is configured by default.Enable IP multicast routing multicast routing-enable RequiredDisabled by defaultFor details about the ip vpn-instance and route-distinguisher commands, refer to MPLS L3VPNCommands in the MPLS Volume.Configuring Multicast Routing and ForwardingConfiguration PrerequisitesBefore configuring multicast routing and forwarding, complete the following tasks:z Configure a unicast routing protocol so that all devices in the domain are interoperable at thenetwork layer.z Enable PIM (PIM-DM or PIM-SM).Before configuring multicast routing and forwarding, prepare the following data:z The maximum number of downstream nodes for a single multicast forwarding table entryz The maximum number of entries in the multicast forwarding tableConfiguring Multicast Static RoutesBy configuring a multicast static route for a given multicast source, you can specify an RPF interface oran RPF neighbor for multicast traffic from that source.Follow these steps to configure a multicast static route:To do... Use the command... RemarksEnter system view system-view —Configure a multicaststatic routeip rpf-route-static [ vpn-instancevpn-instance-name ] source-address { mask |mask-length } [ protocol [ process-id ] ][ route-policy policy-name ] { rpf-nbr-address |interface-type interface-number } [ preferencepreference ] [ order order-number ]RequiredNo multicast static routeconfigured by default.
