D-Link DES-3326S manual Interface, Name System, Probe Interval, 244

DES-3326S Layer 3 Fast Ethernet Switch User’s Guide

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.

Route cost is a relative number that is used by DVMRP to calculate which branches of a multicast delivery tree should be ‘pruned’. The ‘cost’ is relative to other costs assigned to other DVMRP routes throughout the network.

The higher the route cost, the lower the probability that the current route will be chosen to be an active branch of the multicast delivery tree (not ‘pruned’) – if there is an alternative route.

The following fields can be set:

ParameterDescription

Interface	Displays the name of the IP interface
Name<System>	for which DVMRP is to be configured.
	This must be a previously defined IP
	interface.
IP Address	Displays	the	IP	address
	corresponding to the IP Interface
	name entered above.

Probe Interval <10>

This field allows an entry between 0 and 65,535 seconds and defines the interval between ‘probes’. The default is 10.

244 Web-Based Switch Management