SMC Networks SMC6724L3 manual 225, Command Attributes

MULTICAST ROUTING

The global settings that control the prune and graft messages (i.e., prune lifetime) should be configured to the same values on all routers throughout the network to allow DVMRP to function properly. However, if you encounter problems in maintaining a multicast flow, then you may need to modify the protocol variables which control the exchange of topology information between DVMRP routers; such as the probe interval, neighbor timeout or report interval.

Command Attributes

•DVMRP Protocol – Enables/disables DVMRP globally. (Default: Disabled)

•Probe Interval – Sets the interval for sending neighbor probe messages to the multicast group address for all DVMRP routers. Probe messages are sent to neighboring DVMRP routers from which this device has received probes, and is used to verify whether or not these neighbors are still active members of the multicast tree. (Range: 1-65535 seconds; Default: 10 seconds)

•Neighbor Timeout Interval – Sets the interval to wait for messages from a DVMRP neighbor before declaring it dead. This command is used for timing out routes, and for setting the children and leaf flags. (Range: 1-65535 seconds; Default: 35 seconds)

•Report Interval – Specifies how often to propagate the complete set of routing tables to other neighbor DVMRP routers. (Range: 1-65535 seconds; Default: 60 seconds)

•Flash Update Interval – Specifies how often to send trigger updates, which reflect changes in the network topology.

•Prune Lifetime – Specifies how long a prune state will remain in effect for a multicast tree. (Range: 1-65535; Default: 7200 seconds)

•Default Gateway* – Specifies the default DVMRP gateway for IP multicast traffic. (Default: none)

-The specified interface advertises itself as a default route to neighboring DVMRP routers. It advertises the default route out through its other interfaces. Neighboring routers on the other interfaces return Poison Reverse messages for the default route back

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