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DVMRP Configuration View


Use the DVMRP Configuration View to enable DVMRP on selected interfaces, which allows the IP switch element to route multicast traffic, such as interactive multimedia, to other nodes.

To present the DVMRP Configuration View, click the DVMRP link in the Routing Configuration section of the Config Tool main menu. The following figure shows an example of the DVMRP Configuration View.

The following section describes the fields in the DVMRP Configuration View.

Threshold
Represents the minimum IP
time to live (TTL) required for a multicast datagram to be forwarded. It is used to administratively control the scope of multicast datagrams. Note that the TTL of forwarded packets is only compared to the threshold, not decremented by the threshold. Every multicast router decrements the TTL by 1. When connecting to the Internet Multicast Backbone (MBONE), the following values are recommended:

TTL

Interface Type

1

Link within a site

32

Site boundary

64

Regional boundary

128

Continental boundary


The default value is 1.
Rate Limit
Specifies a bandwidth limit for all multicast traffic forwarded along the interface link. The rate limit value is specified in units of kilobits per second.

[Note] This feature is not supported in the current DIGITAL release.


The default value is 0, which represents the special case of no rate limit.
Metric
Represents the cost associated with sending a datagram on the interface. It may be used to influence the choice of routes. A less expensive interface (smaller metric) will be preferred to a more expensive interface (larger metric). Metrics should be kept as small as possible, since DVMRP cannot route along a path with a sum of metrics greater than 31. The default value is 1.
See also:
DVMRP Configuration

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