
Configuring DLSw Services
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Memory Requirements
DLSw provides buffering of LLC2 packets in single switch-mode, and additional
buffering of TCP packets in dual-switch mode. Therefore, DLSw can use a
significant amount of memory.
To limit the memory consumption, Bay Networks provides several mechanisms,
including
• LLC2 Max Links parameter, allowing the network administrator to limit the
number of LLC2 stations per interface. Refer to Configuring LLC Services.
• DLSw Max Slot Sessions parameter, allowing the network administrator to
limit the number of LLC2 stations per slot. See Chapter 5 for instructions on
accessing and editing the Max Slot Sessions (DLSw global) parameter.
• Technician Interface commands, allowing the user to limit the total memory
used by DLSw.
For more information on DLSw memory usage, contact Bay Networks Technical
Response Center.
TCP Considerations
TCP timers allow you to configure DLSw to periodically give TCP data to
transmit if a connection is inactive for a period of time. The mechanism by which
TCP determines a lost connection (either a failed link with no rerouting possible,
or the remote router is unavailable) is based on TCP attempts to deliver this data.
If TCP does not receive an acknowledgment after a series of retries, it declares the
connection down and informs DLSw. DLSw then manages the currently active
sessions.
There are two main configuration parameters associated with DLSw timers:
• DLSw Keepalive Time
• TCP Max Retransmission Timeout
This section summarizes the Max Retransmission Timeout parameter. For more
information, refer to Configuring Bridging Services. For information on the
DLSw Keepalive Time parameter, refer to Chapter 3.
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