
Data Link Switching Overview
114063 Rev. A 1-13
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.
Figure 1-7 illustrates DLSw single-and dual-switch networks where Bay
Networks routers perform as primary SDLC nodes.
Figure 1-7. Primary SDLC Routers in (a) Single- and (b) Dual-Switch DLSw Networks
LLC 2 LLC 2
LLC 2 or SDLC
Bay Networks Router
Token Ring
Bay Networks Router
SDLC
Cluster Controller
LLC
LLC2 LLC2
Token Ring
Ethernet
Frame Relay
Backbone
NetBIOS
Server
Logical Connection
SNA
Processor
Frame Relay
(Only)
DSW0003A
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