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Configuring DLSw Services

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304233-A Rev. 00

DLSw integrated SDLC supports devices configured as primary or secondary link

stations to the router. 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.

When configured as an SDLC primary device, the router polls downstream cluster

controllers, such as the IBM 3174 and the IBM 5394. When configured as a

secondary device, the router responds to polls from the primary device.

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

Point-to-point connects one SDLC device to another. Multipoint connects several

secondary SDLC devices to one primary SDLC device. 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.

Primary SDLC Support

A Bay Networks router configured as a primary device on an SDLC link can:

• Control the data link

• Issue commands

• Initiate error recovery procedures

The primary link station addresses and sends command frames to any or all

secondary link stations on the network. Each frame carries the individual or group

address of the station or stations to which the frame is directed. A secondary link

station receives commands and responds to primary link station polls.

In both single and dual switch-to-switch networks, you must map the addresses of

the SDLC devices to Token Ring/802.5 addresses. To map the addresses, you

configure the SDLC devices as local devices, enabling them to appear to the

network as natively attached LAN devices. Chapter 4 describes how to configure

local devices.

Figure 1-9

illustrates DLSw single- and dual-switch networks where Bay

Networks routers perform as primary SDLC nodes.

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Avaya Configuring DLSw Services Manual do Utilizador Página 42