
Data Link Switching Overview
114063 Rev. A 1-7
Figure 1-2. Bay Networks Single-Switch Router
There are two important types of single-switch conversion:
• FRAD operation
• SDLC-to-LLC2 conversion
FRAD Operation
Single-switch services enable a Bay Networks router to function as a Frame Relay
Access Device (FRAD). SNA devices are typically connected over a LAN or
SDLC connection to the router, providing local termination. The router first
connects to the Frame Relay (or other wide area) network, and then to an SNA
processor using the Boundary Network Node (BNN) or the Boundary Access
Node (BAN). BNN is the RFC 1490 standard. Refer to the “Frame Relay
Support” section of this chapter for more information on BNN and BAN.
SDLC-to-LLC2 Conversion
Using single-switch conversion enables the router to convert incoming SDLC
traffic into the appropriate LAN format for forwarding to an attached Token Ring,
Ethernet or FDDI network. The conversion does not require an intervening wide
area network.
LLC 2
Bay Networks Router
Token Ring
LLC2
SDLC
Cluster Controller
Ethernet
Net BIOS
Server
SNA
Processor
Frame Relay
LLC 2 or SDLC
Logical Connection
DSW0002A
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