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Configuring NetBIOS over IP

8-7

Aging a Cache Entry

The router ages cache entries to ensure that cached routes remain consistent with

the current network topology. If the cache table lookup mechanism does not

access a cache entry within the interval you set in the appropriate Cache Aging

Time parameter, the router deletes the entry from the table.

If the router receives a broadcast Name Query Request from a client and ﬁnds the

name and associated IP address of the requested server in its cache, the router

replaces the broadcast address on the Name Query Request with the unicast IP

address. The router also assigns the entry a short time to live. If the entry is valid,

the router will receive a Positive Name Query Response (which will validate the

entry) from the server within the speciﬁed time to live. If the entry is invalid, the

Name Query Request will not reach the server. In this case, the entry quickly ages

out.

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.

For instructions on using Site Manager to specify an age value for cache entries, see

the Name Cache Age parameter on page 8-14.

You can specify the number of entries in the hash table. For instructions, see the Hash

Entry Count parameter on page 8-14.

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