D-Link DGS-6600-48TS Configuration Guide - Page 399

Volume 7-Multicast / Chapter 37-Multicast Configuration Chapter Overview Chapter 37 Multicast Configuration Chapter Overview The following topics are included in this chapter, please go to the topic for more detailed information: • Chapter Overview • An Introduction to Multicast • Multicast Filter Mode Configuration Commands • Multicast Filter mode Introduction • Configuring Multicast Filtering on an Interface • PIM • Enabling the ip multicast routing service • Enabling PIM • Creating a static ip multicast route • Configuration Examples • PIM-DM configuration Examples • PIM-SM Configuration Example • DVMRP Configuration Example • IGMP Snooping Configuration Example An Introduction to Multicast This Chapter deals with Multicast commands, the delivery of information to a group destination computers simultaneously in a single transmission from the source; while creating copies automatically in the other elements, like routers, on the network. Multicast filtering mode command, to configure the switch to handles unknown multicast packets. Protocol independent multicast (PIM) to provide one-to-many and many-to-many distributions of data over a LAN or WAN using routing information supplied by oy other routing protocols such as BGP. This switch supports PIM sparse mode (PIM-SM) to build unidirectional shared trees rooted at a rendezvous point (best used for scalable networking) and PIM dense mode (PIM-DM) to build shortest path trees by flooding multicast traffic domain wide to check where no receivers are present. Multicast refers to a network technology that forwards packets to more than one receiver through a multicast flow. Only the hosts joining the group can receive the packets from the specific multicast group. Multicast can save network bandwidth greatly as only a single packet is transmitting on any link of the network, no matter how many receivers are deployed. the most common transport layer protocol used in multicast addressing are User Datagram Protocol (UDP) packets with a best effort service. It does not provide as reliable a transmission and error control as TCP. The multicast environment consists of senders and receivers. Sender sends multicast packets with a multicast group address used to distinguish different multicast flows. However, only the members of a group can receive the message destined for this group. Membership in a multicast group is dynamic; hosts can join and leave at any time. There is no restriction on the location or number of members in a multicast group. If necessary, a host can be a member of more than one multicast group at a time. Therefore, the active status of a group and the number of group members vary from time to time. Devices run a multicast routing protocol (such as PIM-DM, PIM-SM, etc.) to maintain their routing tables to forward multicast messages, and use the Internet Group Management Protocol (IGMP) to learn the status of the members within a group on their directly attached subnets. A host can join or leave DGS-6600 Configuration Guide 399