
Configuring DLSw Services
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Selecting DLSw may enable the following subsystems:
• A data link control subsystem, either LLC2 (for LAN media and Frame
Relay) or SDLC
• SRB or Bridge subsystems
• TCP and IP subsystems (dual-switch only), where DLSw uses TCP/IP to
ensure reliable data delivery
Additionally, when you enable DLSw for the first time on a Bay Networks router,
the software automatically displays a set of DLSw screens. These screens display
parameters that DLSw requires before it can successfully communicate on the
network. These parameters include
• DLSw global
• SAP table
• Slot table
• Peer table
DLSw Session Setup
Before configuring DLSw, you should be familiar with how DLSw establishes
sessions between network endpoints. To establish SNA or NetBIOS sessions
between endpoints (devices), Bay Networks routers with DLSw enabled execute
the following sequence of events:
• Upon receiving a TEST (POLL) or similar frame from an attached endstation,
the receiving slot performs the following:
-- Converts the TEST (POLL) frame into an SSP CANUREACH command.
-- Searches the appropriate cache to determine if the remote location is
known. If the remote location is already in the cache, the CANUREACH
is forwarded only to this remote location. If the remote location is not in
the cache, DLSw forwards the CANUREACH to all remote routers
specified in the DLSw Peer IP Table, if this table exists.
-- Forwards the packet to all other slots defined in the DLSw Slot Table.
• Upon receiving a CANUREACH frame, a DLSw slot:
-- Forwards the frame to all other slots defined in this router’s DLSw Slot
Table.
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