D-Link DGS-3308FG Product Manual - Page 106

8-port Gigabit Ethernet Switch User's Guide Figure 6-44. DVMRP Interface Configuration screen • Interface Name:[ ] - Enter the name of the IP interface for which DVMRP is to be configured in this field. This must be a previously defined IP interface. See Setting up IP Interfaces in Chapter 6 of this manual for more information. Note: The Distance Vector Multicast Routing Protocol (DVMRP) is a hop-based method of building multicast delivery trees from multicast sources to all nodes of a network. Because the delivery trees are 'pruned' and 'shortest path', DVMRP is relatively efficient. Because multicast group membership information is forwarded by a distance-vector algorithm, propagation is slow. DVMRP is optimized for high delay (high latency) relatively low bandwidth networks, and can be considered as a 'best-effort' multicasting protocol. See Chapter 5, Distance-Vector Multicasting Routing Protocol for more information. Note: DVMRP resembles the Routing Information Protocol (RIP), but is extended for multicast delivery. It relies upon RIP hop counts to calculate 'shortest paths' back to the source of a multicast message, but defines a 'route cost' to calculate which branches of a multicast delivery tree should be 'pruned' - once the delivery tree is established. Note: When a sender initiates a multicast, DVMRP initially assumes that all users on the network will want to receive the multicast message. When an adjacent router receives the message, it checks its unicast routing table to determine the interface that gives the shortest path (lowest cost) back to the source. If the multicast was received over the shortest path, then the adjacent router enters the information into its tables and forwards the message. If the message is not received on the shortest path back to the source, the message is dropped. Note: DVMRP version 3 incorporates the Reverse Path Multicasting algorithm. See Chapter 5, Reverse Path Multicasting, for more information. • Neighbor Time-Out Interval:[35 ] - This field allows an entry between 1 and 65,535 seconds and defines the time period for which DVMRP will hold Neighbor Router reports before issuing poison route messages. The default is 35 seconds. 96