
Customizing DVMRP
114064 Rev. B 4-17
Specifying the Cost
By default, DVMRP assigns a metric of 1 to a tunnel. You can use Site Manager to
specify a cost value from 1 to 31.
Specifying a TTL
By default, DVMRP assigns a TTL value of 1 to a tunnel. This value is the
minimum IP TTL required for a multicast datagram to be forwarded out this
tunnel. You can use Site Manager to assign a value from 1 to 254.
Use this value to control the scope of the datagrams. If the IP TTL is less than the
threshold value you specify, the router drops the datagram.
Configuring a Forwarding Table for the Tunnel
By default, DVMRP preallocates a forwarding table for 32 entries. You can use
Site Manager to specify the maximum number of entries (from 32 to 512) allowed
in the forwarding table associated with this tunnel interface.
When configuring a cache size, you must also keep in mind the TTL value for
entries. If you specify a large cache size, you can specify a larger TTL value. A
smaller cache requires a smaller TTL for cache entries.
By default, DVMRP assigns a TTL value of 300 seconds to an entry in a tunnel
forwarding table. You can use Site Manager to assign a value in the range of 300
to 86400 seconds.
Site Manager: Metric parameter: page A-10
Site Manager: Threshold parameter: page A-11
Site Manager: Forward Cache Size parameter: page A-11
Site Manager: Forward Cache TTL parameter: page A-11
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