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Configuring DLSw Services

3-14

Local Devices

DLSw uses Local Device entries to deﬁne SDLC-attached SNA physical units

(PUs) to the router. NetBIOS does not support SDLC-attached devices.

To take advantage of integrated SDLC services in DLSw, you must deﬁne the

SDLC devices that you want to appear as natively attached to the LAN. When you

deﬁne such devices, you map the devices to LAN MAC and SAP addresses.

You can add Local Devices at the following times:

• When you add SDLC to a synchronous circuit and add the DLSw protocol to

that circuit.

• When you edit a synchronous circuit that already has SDLC and DLSw on it.

• When you edit DLSw interface parameters. In this case, the interface whose

parameters you edit must already have at least one local device deﬁned on it. .

Several Local Device parameters must match other entries in the router, or in the

attached SDLC device. These include:

• Link Address (hex)

This parameter must match the polling address deﬁned in the SDLC-attached

device.

• PU Type

This parameter must match the PU type of the SDLC-attached device. For

some devices, this is a ﬁxed value. For example, the IBM 3274 is a PU2.0,

while the IBM 5494 is a PU 2.1. For other devices, it is explicitly deﬁned. For

example, the IBM 3174 can be conﬁgured as PU 2.0 or PU 2.1.

• IDBLOCK and IDNUM

These parameters (required for PU 2.0 devices only) must match the same

values on the host. The 3-digit IDBLOCK and the 5-digit IDNUM may be

deﬁned on the host as a single 8-digit XID.

• XID Format

This parameter is typically set to FIXED for PU 2.0 devices, and set to

NEGOTIABLE2 for PU 2.1 devices.

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