
Configuring IP Multicasting Services
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Estimating the Number of Routes
By default, DVMRP preallocates a routing table for 25 entries. You can use Site
Manager to specify the number of entries (10 or greater).
Enter a value that the router can use for preallocating routing tables. For an
MBone deployment, a value of 3000 or higher is recommended.
Note that routes are kept on a per-source-network basis, independent of multicast
groups. This number must include a route for every network that is local to a
circuit configured for multicasting. This is to allow the router to utilize memory
efficiently; exceeding this size during router operation will not cause an error but
may cause the router to consume more memory than is required.
Logging Debugging Messages
By default, DVMRP does not log debugging messages. You can use Site Manager
to enable the logging of debugging messages and to specify the level of debug
messages.
Specifying an MTU Size
By default, DVMRP uses a maximum transmission unit (MTU) size of 1514. (The
default maximum size is the CSMACD_MTU size. The minimum size is the
X25_DDN_MTU size.)
You can use Site Manager to specify an MTU size in the range of 910 to 1514
bytes.
Site Manager: Estimated Routes parameter: page A-4
Site Manager: Debug Level parameter: page A-5
Site Manager: Fragmented MTU Threshold parameter: page A-6
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