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Configuring DLSw Services
3-20 114063 Rev. A
Dynamically Learned Remote Systems
Bay Networks routers cache (dynamically learn) the MAC address and NetBIOS
name of remote systems.
Local Bay Networks routers receive frames that contain information about the
DLSw peer IP address of each remote system that uses DLSw services. This
information is learned from broadcast frames (TESTs, XIDs, and NetBIOS)
generated by the remote endstations or applications. The router stores this
information in separate NetBIOS and MAC caches.
The router uses the learned IP address to locally specify the DLSw peer that can
reach the desired endstation. The cache is not used for forwarding traffic during
the first LLC2 session, but will be used in new sessions with that endstation.
You can set a timer value that determines when NetBIOS or MAC cache entries in
the router disappear. The timer parameters are NetBIOS Cache Age and MAC
Cache Age. When the cached entry goes unused for the specified cache age time,
or becomes unreachable to new queries, it is removed from the cache and
subsequent frames are broadcast to all configured peers.
The router refreshes a cache entry when DLSw services establish a connection to
the NetBIOS or SNA system associated with that entry. (The router resets the
appropriate Cache Age timer to its maximum wait interval.)
Statically Defined Remote Systems
To reduce DLSw broadcasts, you can define the IP addresses of DLSw peers that
can reach remote systems or applications associated with specific NetBIOS names
or MAC addresses. This information augments any information that the router’s
MAC and NetBIOS caching mechanisms learn dynamically.
Static entries can exist in two tables:
Default MAC Peer IP Table
Each entry in this table contains a MAC address and the IP address of a DLSw
peer that can forward packets to this MAC address.
Default NetBIOS Peer IP Table
Each entry in this table contains the NetBIOS name and the IP address of the
DLSw peer to which this NetBIOS device is connected.
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