Basics of IP Multicast
Designed for group communication:
- Where IP PDUs (Protocol Data Unit) are replicated only when necessary
- Hence an efficient resource usage
- Services identified by group addresses
- In the 224/4 range (class D addresses)
- Receivers subscribe to a service by means of the IGMP (Internet Group Management Protocol)
- IGMP traffic located in the LAN between hosts and access router
- Multicast traffic conveyed along a distribution tree
- By activating a multicast routing protocol