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Multicast

  • Controller-based BGP multicast signaling (MX Series, PTX Series, and QFX Series)—Starting in Junos OS Release 21.1R1, we’ve introduced controller-based BGP multicast signaling that can be used instead of hop-by-hop signaling to program multicast forwarding states on routers. An external controller that is aware of the topology and network events within that topology calculates the optimum multicast trees between the source and receivers. The external controller then uses BGP signaling to send a new type of BGP network layer reachability information (NLRI) with modified attributes to convey the multicast state information to all the routers on the multicast trees.

    You can use this feature instead of multicast routing protocols, such as Protocol Independent Multicast (PIM) or multipoint LDP (MLDP). You can enable this feature using bgpmcast configuration option at the [edit protocols] hierarchy.

  • Support for next-generation multicast VPN (QFX10002, QFX10008, and QFX10016)—Starting in Junos OS Release 21.1R1, we support Multiprotocol BGP (MBGP) next-generation multicast VPNs with the following types of provider tunnels:

    • Ingress replication
    • RSVP-Traffic Engineering (RSVP-TE) point-to-multipoint (P2MP)
    • Multipoint LDP P2MP

    A P2MP is a Multiprotocol Label Switching (MPLS) label-switched path (LSP) with a single source and multiple destinations. By taking advantage of MPLS packet replication capability of the network, P2MP LSPs avoid unnecessary packet replication at the ingress router. Packet replication takes place only when packets are forwarded to two or more different destinations requiring different network paths.

    [See Multiprotocol BGP MVPNs Overview and provider-tunnel.]