Dell N3200-ON EMC Networking N-Series Switches User Guide version 6.6.3 - Page 957

24 Layer-2 Multicast Features Dell EMC Networking N-Series Switches This chapter describes the Layer-2 (L2) multicast features on the Dell EMC Networking N-Series switches. The features this chapter describes include bridge multicast flooding and forwarding, Internet Group Management Protocol (IGMP) snooping, Multicast Listener Discovery (MLD) snooping, and Multicast VLAN Registration (MVR). The topics covered in this chapter include: • L2 Multicast Overview • Snooping Switch Restrictions • Default L2 Multicast Values • Configuring L2 Multicast Features (Web) • Configuring L2 Multicast Features (CLI) • Case Study on a Real-World Network Topology L2 Multicast Overview Multicast traffic is traffic from one source that has multiple destinations. The L2 multicast features on the switch help control network flooding of Ethernet multicast and IP multicast traffic by keeping track of multicast group membership. It is essential that a multicast router be connected to a Dell EMC Networking Layer-2 multicast switch for IGMP/MLD snooping to operate properly. The presence of a multicast router allows the snooping switch to relay IGMP reports to the router and to forward multicast data sources to the multicast router as well as restrict flooding of multicast sources in a VLAN. Multicast Flooding and Forwarding Flooding behavior is to send incoming multicast packets to all ports in the VLAN other than the ingress port. Forwarding behavior is to send incoming multicast packets to selected ports in the VLAN. Forwarding behavior is Layer-2 Multicast Features 957