
Configuring DLSw Services
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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.
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.
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.
Integrated SDLC Conversion
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
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 1-5).
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