D-Link DES-3326 User Manual page 210

24-port NWay Ethernet Switch User's Guide
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:
initially assumes that all users on the network will want
to receive the multicast message.
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.
The NBR Report Timer:[35
and 65,535 seconds and defines the time period for which Non-
Membership Report messages are valid.
seconds.
Note: NBR reports are received from neighboring
multicast routers to inform the current router that they
have no multicast group members. If the NBR Report
Timer expires before a new NBR is received, the
neighboring multicast router is considered as potentially
having multicast group members and DVMRP messages
are again forwarded to the neighboring multicast router.
The Route Cost:[1 ] field allows an entry between 1 and 255
and defines the route cost for the IP interface.
route cost is a relative number that represents the real cost of
using this route in the construction of a multicast delivery tree.
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When a sender initiates a multicast, DVMRP
Configuring the Switch Using the Console Interface
When an adjacent
] field allows an entry between 1
The default is 35
T he DVMRP