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Data Link Switching Overview

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DLSw runs on all Bay Networks router platforms using local and wide area

network facilities, including:

• LLC2 media, including Ethernet, Token Ring, Frame Relay, and

asynchronous transfer mode (ATM) LAN emulation (LANE)

• Other media using source route bridging (SRB) formats, including Fiber

Distributed Data Interface (FDDI), switched multimegabit data service

(SMDS), Frame Relay, Point-to-Point (PPP), and ATM (RFC 1483)

• Synchronous Data Link Control (SDLC) links in point-to-point and

multipoint configurations

• X.25 links using the Qualified Link Level Control (QLLC) protocol

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).

RFC 1795 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.

Note:

In this guide, the term local area network (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. For more information on the

media that SRB supports, see Configuring Bridging Services.

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