
Customizing DVMRP
114064 Rev. B 4-7
If neighboring routers have the same metric to a given source network, the router
with the lower IP address will be responsible for propagating multicast traffic
originating from that source network onto the network or tunnel that is common to
these neighboring routers.
A network that is not on the shortest path to a source network from a multicast
router is considered to be a leaf. In F
igure 4-1, the network connected to Router E
(Net 5) is a leaf network.
Configuring DVMRP on the Router
When you select DVMRP, support for the protocol is automatically enabled on the
router.
You can use Site Manager to disable and reenable DVMRP on the router.
Setting the Update Interval
Periodically, each multicasting router issues full or partial routing information on
each DVMRP circuit, using DVMRP report messages. This routing information
represents the sending router’s cost to reach the specified network (the cost is the
sum of the hop metrics along the shortest path to the given source network).
You can use Site Manager to
• Specify how often routing messages containing complete routing tables are
sent.
• Specify the minimum amount of time between triggered updates. Triggered
updates are sent in the period between full updates. Issuing a full update
restarts the triggered update timer. Therefore, the triggered update interval
you specify must be shorter than the full update interval you have specified.
Site Manager: Enable parameter: page A-2
Site Manager: Full Update Interval parameter: page A-2
Site Manager: Triggered Update Interval parameter: page A-2
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