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Data Link Switching Overview

304233-A Rev. 00

1-23

Combining Primary and Secondary SDLC

Using primary and secondary SDLC services, a network can transport existing

SDLC traffic over a router-based topology that:

• Enables existing SDLC traffic to use a high-speed multiprotocol backbone

network

• Simplifies the migration to a router-based network, by incorporating SDLC

traffic into the multiprotocol backbone without converting the existing

endstations

• Locally acknowledges the SDLC protocol at each side of the router-based

network, eliminating polling and acknowledgment traffic from the network

backbone

• Allows high-speed links into the SNA host, improving response time

Figure 1-11

illustrates primary and secondary SDLC using single- and

dual-switch services.

Figure 1-11. Combining Primary and Secondary SDLC

Negotiable SDLC Support

A Bay Networks router acting as a negotiable device on an SDLC link exchanges

XID3 packets with another link station to negotiate which one will be primary and

which secondary. Link characteristics and subarea PU name are also exchanged.

Front-end

processer

Host

3174

5394

SDLC

secondary

SDLC

secondary

SDLC

primary

Backbone

DLS0025A

AS/400

Bay Networks

router

Bay Networks

router

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Avaya Configuring DLSw Services Bedienungsanleitung Seite 45