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Overview of IBM Networking
IBM Network Media Translation
BC-217
Cisco IOS Bridging and IBM Networking Configuration Guide
78-11737-02
The Cisco Implementation of SDLC
The Cisco SDLC implementation supports the following features:
• Frame Relay Access Support (FRAS)
With FRAS, a router functions as a Frame Relay Access Device (FRAD) for SDLC, Token Ring,
and Ethernet-attached devices over a Frame Relay Boundary Network Node (BNN) link.
Frame Relay access support is described in the chapter “Configuring SNA Frame Relay Access
Support.”
• SDLLC media translation
The SDLLC feature provides media translation between the serial lines running SDLC and Token
Rings running LLC2. SDLLC consolidates the IBM SNA networks running SDLC into a
LAN-based, multiprotocol, multimedia backbone network.
SDLLC is described in the chapter “Configuring IBM Network Media Translation.”
• SDLC local acknowledgment
SDLC local acknowledgment is used with SDLC STUN. TCP/IP must be enabled. With local
acknowledgment, STUN SDLC connections can be terminated locally at the router, eliminating the
need for acknowledgments to be sent across a WAN.
SDLC local acknowledgment is described in the section “Establish the Frame Encapsulation
Method” in the chapter “Configuring STUN and BSTUN.”
IBM Network Media Translation
The Cisco IOS software includes the following media translation features that enable network
communications across heterogeneous media:
• SDLLC media translation enables a device on a Token Ring to communicate with a device on a serial
link.
• QLLC conversion enables an IBM device to communicate with an X.25 network without having to
install the X.25 software on local IBM equipment.
SDLLC is a Cisco Systems proprietary software feature that enables a device on a Token Ring to
communicate with a device on a serial link by translating between LLC2 and SDLC at the link layer.
SNA uses SDLC and LLC2 as link layer protocols to provide a reliable connection. The translation
function between these industry-standard protocols takes place in the proprietary Cisco software.
This section contains a brief overview of IBM Network Media Translation:
• SDLLC Media Translation Features, page 218
• QLLC Conversion, page 220
• The Cisco Implementation of QLLC Conversion, page 221
• Comparing QLLC Conversion to SDLLC, page 222
• Other Implementation Considerations, page 223