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DES-3326S Layer 3 Fast Ethernet Switch User’s Guide
244 Web-Based Switch Management
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:
Parameter Description
Interface
Name<System>
Displays the name of the IP interface
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.