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Configuring DLSw Services

1-6

304233-A Rev. 00

Single TCP/IP Connection

DLSw Version 2 uses a single full-duplex TCP session to transport data. Using a

single full-duplex TCP/IP session instead of two half-duplex sessions reduces the

amount of time and memory required to establish the TCP connection.

RFC 2166 Multicast Support

In addition to IP unicast broadcast services, DLSw provides IP multicast support.

The capability to send and receive both IP multicast traffic and IP unicast traffic

makes the Bay Networks implementation of DLSw fully compliant with RFC

2166.

RFC 2166 is an implementation of DLSw that was developed by the APPN

Implementors Workshop, a consortium of vendors.

RFC 2166 provides improvements for scalability by allowing:

• The initial session establishment request (CanuReach) to be sent using

multicast IP

• Only a single bi-directional TCP connections to be used

• TCP connections to be established (and disconnected) on demand and as

needed

RFC 2166 also provides reason codes with the HALT_DL and

HALT_DL_NOACK SSP messages to provide more diagnostic information.

Differences Between RFC 2166 and RFC 1795

The following comparison of RFC 2166 with earlier DLSw RFCs 1434 and 1795

shows how RFC 2166 reduces the amount of broadcast traffic on the network.

• Under RFCs 1434 and 1795, an end station (an SNA or NetBIOS application)

that wants to establish a network connection first sends a DLSw SSP

CanuReach (or NETBIOS_NQ) message to all routers that are part of the

DLSw network. In a large network with many end stations, these connection

attempts result in a large number of packets traveling on the network. In

addition, under RFCs 1434 and 1795, TCP connections must be constantly

maintained between all participating routers within the DLSw network.

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