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A multicast address is a logical identifier for a group of hosts in a computer network that are available to process datagrams or frames intended to be multicast for a designated network service.
The Internet Group Management Protocol (IGMP) is a communications protocol used by hosts and adjacent routers on IPv4 networks to establish multicast group memberships. IGMP is an integral part of IP multicast and allows the network to direct multicast transmissions only to hosts that have requested them.
mcast.net is a second level domain reserved by the Internet Assigned Numbers Authority (IANA) and maintained by Verisign used to bind DNS records unique to multicast addressing. [1]
In the virtual MAC address, Xs represent the group ID in hex.. HSRP is not a routing protocol as it does not advertise IP routes or affect the routing table in any way.. HSRP has the ability to trigger a failover if one or more interfaces on the router go down.
Label Distribution Protocol (LDP) is a protocol in which routers capable of Multiprotocol Label Switching (MPLS) exchange label mapping information. Two routers with an established session are called LDP peers and the exchange of information is bi-directional.