IPv4 link-local multicast addresses

As we have learned from previous lesson, IPv4 Class D multicast address range is between and Four most-significant bits of left-most octet is reserved as 1110 followed by the 28-bit multicast group ID.

The Class D multicast addresses in the range of ( through is the link-local multicast address range of addresses.

There are many reservations for IPv4 multicast addresses for different functions. IPv4 multicast addresses in the range to are called as link-local multicast address range and they are reserved for network protocols on a local network segment. The link-local multicast address range IPv4 multicast address range to ( are reserved for local purposes in the local network segment. The routers should not forward IPv4 datagrams addressed to link-local multicast address range to to another network segment. The main use of the link-local multicast address ranges from to is for router discovery and to communicate routing information between routers.

Some important link-local multicast addresses are listed below.

Link-local multicast address Description All systems on local network segment All routers on local network segment DVMRP routers OSPF routers OSPF designated routers RIPv2 routers EIGRP routers DHCP server/relay agent All PIM routers VRRP (Virtual Router Redundancy Protocol) All IGMPv3-capable multicast routers HSRP (Hot Standby Router Protocol) PTP v2 (Precision Time Protocol) mDNS (Multicast DNS) LLMNR (Link-local Multicast Name Resolution) Teredo

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