
Using NetBIOS Services
114060 Rev. A 3-5
Name Caching
The source route bridge NetBIOS name cache contains NetBIOS names, MAC
addresses and the RIF needed to reach the station containing that name.The
NetBIOS name cache learns the station names from name query (if client cache is
enabled), name recognized (if server cache is enabled), and datagram frames (if
datagram cache is enabled). The name learned is always the source name of any
given message.
If you enable any type of name caching, the router tries to convert any of the name
query, name recognized, or datagram frames from an explorer to an SRF based on
the destination name. Note that the router converts these frames regardless of the
conditions under which it learned the frame’s name.
For example, assume that there are three NetBIOS stations (A, B, and C) in the
network and only server name caching is configured on the router.
• If Station A sends a name query frame for Station B, the router does not cache
any names.
• When Station B responds with a name recognized frame, the router caches
Station B’s name, MAC address, and RIF, but it does not convert the name
recognized frame to an SRF because Station A is not in the cache.
• If Station C now sends a datagram to Station B, the router converts it to an
SRF using the cache (even though datagram caching is disabled).
Note that the enabling or disabling of caching refers to the learning of names, not
to the conversion of AREs to SRFs. The router tries to convert AREs to SRFs on
name query, name recognized, and datagram requests whenever any type of name
caching is enabled.
Client Name Caching
If you enable
client name caching, the source routing bridge caches (learns and
stores in the NetBIOS name cache tables) the source name and associated RIF
found in any name query STE frame it receives. In addition, the source routing
bridge uses information cached from name query frames to convert name
recognized, datagram, or other name query broadcast frames into SRFs.
If you disable client name caching, the source routing bridge cannot cache client
names and RIFs.
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