
Configuring IP Services
8-10 114065 Rev. A
Customizing a Cache Search
The mechanism that NetBIOS uses to search for a name in the cache is based on a
fast string hash/search mechanism developed for AppleTalk Zone Name
processing. This mechanism uses a hash table that NetBIOS builds and maintains
on the router.
Increasing the number of entries in the hash table
• Decreases the number of names the router must compare before finding a
specific cached name
• Decreases the amount of time it takes the router to find a particular cached
name
• Increases memory usage
Note that increasing the number of entries in the hash table does not increase the
number of names the router can cache. This is determined by user configuration
and by available memory.
By default, NetBIOS allows 253 names in the hash table.
You can use Site Manager to specify the number of entries you want to allow in
the cache lookup tables.
For networks that actively use up to 2500 NetBIOS server names, use the default
value (253). To determine a hash entry count for larger networks:
• Divide the total number of unique NetBIOS server names active in the
network by 10.
• Adjust the quotient to the nearest (higher or lower) prime number. (A prime
number can only be divided by itself or by 1 and still yield a whole-number
quotient.)
• Replace the default value with the new, calculated number.
Increasing the number of hash table entries does not increase the number of names
that a router can cache. With larger networks, increasing the size of the hash tables
may, however, reduce internal cache lookup time, thereby improving overall
performance.
Site Manager: Hash Entry Count parameter: page A-68
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