1212 CHAPTER 72: IPV6 MULTICAST ROUTING AND FORWARDING CONFIGURATIONConfiguring IPv6Multicast Routing andForwardingConfigurationPrerequisitesBefore configuring IPv6 multicast routing and forwarding, complete the followingtasks:■ Configure an IPv6 unicast routing protocol so that all devices in the domain areinteroperable at the network layer.■ Configure IPv6 PIM-DM or IPv6 PIM-SM.Before configuring IPv6 multicast routing and forwarding, prepare the followingdata:■ Minimum hop limit value required for an IPv6 multicast packet to be forwarded■ Maximum number of downstream nodes for a single route in the IPv6 multicastforwarding table■ Maximum number of routing entries in the IPv6 multicast forwarding tableEnabling IPv6 MulticastRoutingBefore configuring any Layer 3 IPv6 multicast functionality, you must enable IPv6multicast routing.Follow these steps to enable IPv6 multicast routing:Configuring an IPv6Multicast Routing PolicyIf more than one unicast route with the same cost exists when a multicast routerselects an upstream interface, you can configure the router to determine the RPFroute based on the longest match (that is, by prefix length).With the load splitting feature enabled, IPv6 multicast traffic will be evenlydistributed among equal-cost routes.Follow these steps to configure an IPv6 multicast routing policy:To do... Use the Command... RemarksEnter system view system-view -Enable IPv6 multicast routing multicast ipv6routing-enableRequiredDisabled by defaultTo do... Use the command... RemarksEnter system view system-view -Configure the device toselect a route based on thelongest matchmulticast ipv6longest-matchOptionalIn order of routing table entriesby defaultConfigure IPv6 multicastload splittingmulticast ipv6load-splitting {source |source-group }OptionalDisabled by default
