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DLSw Implementation Notes

304233-A Rev. 00

2-11

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. For instructions on accessing and

editing the Max Slot Sessions (DLSw global) parameter, see Appendix A,

“DLSw Service Parameters.”

• Using DLSw V2.0 or RFC 2166, bidirectional TCP connections can be used,

reducing the amount of memory used for TCP connections.

For more information about DLSw memory usage, contact the Bay Networks

Technical Support 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 four main configuration parameters associated with TCP timers:

• KeepAlive Time

• KeepAlive Retry Timer

• KeepAlive Retries

• TCP Inact Time

For information about the parameters, refer to Appendix A, “DLSw Service

Parameters.”

Flow Control

DLSw uses the following flow control mechanisms to provide reliable end-to-end

delivery of packets:

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Avaya Configuring DLSw Services Manual do Utilizador Página 67