
Data Link Switching Overview
114063 Rev. A 1-3
DLSw runs on all Bay Networks router platforms using local and wide area
network facilities, including
• LLC2 media, including Ethernet, Token Ring, and Frame Relay
• Other media using source route bridge (SRB) formats, including FDDI,
SMDS, Frame Relay, and Point-to-Point (PPP) protocols
• SDLC links in point-to-point and multipoint configurations
You can use DLSw services to support connections between SNA and NetBIOS
systems on one type of network (such as Token Ring/802.5) and systems on
different types of networks (such as Frame Relay).
RFC1795 Support
RFC 1795, called DLSw Version 1, is an implementation of DLSw developed by a
consortium of vendors. RFC 1795 supersedes the original DLSw specification,
RFC 1434. Starting with Version 11.0, Bay Networks DLSw routers support
RFC 1795. These routers are fully compatible with Bay Networks routers that
support the original RFC 1434 specification with Version 10.0 or earlier software.
Differences Between RFC 1795 and RFC 1434
Based on RFC 1434, RFC 1795 describes features that were not originally
published, as well as modifications to the standard. RFC 1795 includes
• Modified frame format for session setup, including a field for the largest
frame size.
• Directed broadcast CANUREACH and ICANREACH control frames. This
feature reduces broadcasting over the network.
• Capabilities exchange, allowing routers to exchange resource information
about each other. Capabilities exchange flows operate in three categories:
Note: In this manual, the term LAN refers to all SRB types of LANs and
transparent-bridge Ethernet/802.3 LANs. SRB LANs include, but are not
limited to, Token Ring/802.5, FDDI, Ethernet/802.3, SMDS, Frame Relay, and
other synchronous media protocols. See Configuring Bridging Services for
more information on the media that SRB supports.
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