294 Network Administration: MulticastFILE LOCATION: C:\Users\gina\Desktop\Checkout_new\Dell Astute\UserGuide\Dell_Astute_Network_Admin_Multicast.fmD E L L C O N F I D E N T I A L – P R E L I M I N A R Y 8 / 9 / 1 6 - F O R P R O O F O N L Y4 Click Edit.5 Select an interface or group of interfaces in the graphic block, and clickone of the following Multicast Forwarding Mode options:– Static—The port receives all Multicast streams.– Forbidden—Ports cannot receive any Multicast streams, even ifIGMP/MLD snooping designated the port to join a Multicast group.– None—The port is not a Forward All portIGMP SnoopingIGMP Snooping can be enabled globally, as described in the GlobalParameters page. It can also be enabled per VLAN to support selective IPv4Multicast forwarding. In this case, Bridge Multicast filtering must also beenabled.By default, a Layer 2 switch forwards Multicast frames to all ports of therelevant VLAN, essentially treating the frame as if it were a Broadcast. WhenIGMP Snooping is enabled per VLAN, the switch forwards Multicast framesto ports that have registered as Multicast clients in the VLAN.NOTE: The switch supports IGMP Snooping only on static VLANs. It does notsupport IGMP Snooping on dynamic VLANs.The IGMP Snooping Querier is used to support a Layer 2 Multicast domainof snooping switches in the absence of a Multicast router, for example, whereMulticast content is provided by a local server, but the router (if one exists)on that network does not support Multicast.There should only be a single IGMP Querier in a Layer 2 Multicast domain.The switch supports standards-based IGMP Querier election when more thanone IGMP Querier is present in the domain.The speed of IGMP Querier activity should be aligned with the IGMP-snooping-enabled switches. Queries should be sent at a rate that is aligned tothe snooping table aging time. If queries are sent at a rate lower than theaging time, the subscriber cannot receive the Multicast packets.To enable IGMP Snooping on a VLAN:1 Click Network Administration > Multicast >IGMP Snooping.The IGMP snooping information for the VLANs on the switch isdisplayed.
