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Data Link Switching Overview

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SDLC Support

Integrated SDLC support merges the SDLC traffic with the 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 1-4.

Integrated SDLC conversion enables existing SDLC traffic to share a backbone

network with LAN traffic without an intervening TCP/IP network. Traffic enters

the DLSw router as SDLC and goes out the router as LLC2 over Token Ring or

Ethernet. The destination endstation can reside on the Token Ring or Ethernet

network directly connected to that DLSw router. SRB can forward the traffic

through the network to a destination host or endstation. In this network, the local

router performs the SDLC conversion, and forwards the traffic across the network

to the host (Figure 1-8)

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

• Serve as a PU 1.0, PU 2.0, or PU 2.1 device

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Avaya Configuring DLSw Services Bedienungsanleitung Seite 41