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Configuring DLSw Services

1-8

SDLC Support

The Bay Networks integrated SDLC support merges the low-speed SDLC trafﬁc

of an SNA network with the high-speed, multiprotocol trafﬁc of LANs into a

single network backbone. SDLC operates in DLSw single switch routers, or in

dual switch-to-switch networks, as illustrated in Figure 1-1.

DLSw integrated SDLC supports devices conﬁgured as primary or secondary link

stations to the router. Only one link station on an SDLC line can be the primary

station; all other stations on the line must be secondary.

A link station is a logical connection between adjacent nodes, where one node is a

primary link station and the other node is a secondary link station. SDLC supports

primary and secondary link stations. A primary link station does the following:

• Controls a data link

• Issues commands

• Initiates error-recovery procedures

A secondary link station receives commands and responds to polls initiated by the

primary SDLC link station.

The synchronous line speed (between the SDLC device and the Bay Networks

router) can be up to 64 Kb/s.

You can use integrated SDLC in a point-to-point or multipoint topology. Point-to-

point connects one SDLC device to the SDLC port. Multipoint connects several

SDLC devices to the SDLC port. You specify the topology when you conﬁgure

SDLC on the synchronous circuit.

For more information on the Bay Networks SDLC implementation, see

Conﬁguring SDLC Services.

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