
Using NetBIOS Services
114060 Rev. A 3-7
If you disable datagram name caching, the source routing bridge cannot cache
NetBIOS names and RIFs that it receives in datagrams.
Query Caching
When a NetBIOS station comes up on the network, it may rebroadcast add name
query and add group name query frames five to ten times at 0.5-second intervals.
This increases the probability that all NetBIOS stations eventually receive these
frames.
The NetBIOS query cache is completely independent of the name cache. Its
purpose is to filter redundant add name query and add group name query requests.
The NetBIOS query cache captures the first add name or add group name query
frame it receives. The router then compares any add name or add group name
query frame it receives subsequently to all of the add name and add group name
query frames held in cache.
If the received query matches any cached query, the router immediately discards
or drops the received query. The query cache, therefore, prevents duplicate add
name query or add group name query frames from flooding the network
repeatedly. Query caching benefits all sizes of networks, especially larger
NetBIOS environments.
The query caching mechanism also prevents duplicate status query frames from
flooding the network.
You can adjust the maximum number of entries allowed in the query cache, using
the source routing bridge’s Max Number Query Cache Entries global parameter.
Any adjustments you make affect the number of queries that each slot can
monitor.
You can also configure the router to create or disable a MIB instance for each
NetBIOS query held in the query cache, using the Create MIB Instances for
Cached Name global parameter. When you enable this function, you can use
SNMP GET commands to view entries in the query cache table in the MIB. (Refer
to “NetBIOS Global Parameter Descriptions” later in this chapter for a description
of this parameter.)
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