
Data Link Switching Overview
1-5
DLSw Single-Switch Services
DLSw single-switch services enable the router to perform link level conversion,
while providing services to ensure session integrity. Examples of single-switch
conversions include
• SDLC to Token Ring
• SDLC to Frame Relay (RFC 1490)
• Token Ring to Ethernet
• Ethernet to bridged SNA over Frame Relay
Single switch configurations provide services to attached devices and networks to
ensure session availability, including
• Local acknowledgment and termination of the LLC2 or SDLC session
• 802.5 routing information field (RIF) caching (allowing more than eight
source-route-bridged rings between a local and remote system)
• MAC address and NetBIOS name caching
Figure 1-2 illustrates a sample network using a single Bay Networks router. The
router can communicate with an IBM front end processor (FEP) or other LAN
gateway.
Figure 1-2. Bay Networks Single-Switch Router
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
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