Customizing DVMRP
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Configuring a Forwarding Table
To minimize the amount of time that it spends looking up routes, DVMRP creates
and maintains a cache of frequently used routes -- called a forwarding table -- for
each IP interface.
By default, DVMRP preallocates a forwarding table of 32 entries for each
interface. You can specify the maximum number of entries (32 through 512)
allowed in the forwarding table associated with this interface.
When configuring a forwarding 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 uses a TTL of 7200 seconds (2 hours) for entries in the
forwarding table. You can specify a TTL from 300 seconds (5 minutes) through
86,400 seconds (24 hours).
If the neighbor is running mrouted, the recommended TTL value is 300 seconds.
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