July 2003
Intermediate to advanced
908 pages
25h 3m
English
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Chapter 15. DLSw
15.0. Introduction
There are essentially two kinds of bridges. The first type is a Source Route Bridge (SRB), which allows end devices to request a particular path through the network using a Routing Information Field (RIF) in the packet. In the default case, this type of bridge cannot forward any packet without a RIF. The second type is a Transparent Bridge, which hides all of that network detail from end devices. Transparent Bridges have no concept of a RIF. SRBs are commonly used with Token Ring networks, while Transparent Bridging is popular with Ethernets, where it is used by Ethernet switches.
Bridging between Ethernet and Token Ring networks requires a special hybrid of these two that is able to translate between not only the media types, but also the bridging types. The Remote Source Route Bridging (RSRB) and Source Route Transparent (SRT) bridging protocols were invented to solve this problem, particularly over WANs.
Data Link Switching (DLSw) and DLSw+, which is Cisco’s enhanced version of DLSw, also solve these problems and comply with the same bridging standards. These protocols are capable of connecting Token Rings to Ethernets, Synchronous Data Link Control (SDLC) serial connections, and even X.25 networks. So there is really very little reason to worry about the older bridging protocols and methods anymore. If you are considering building a new network involving the System Network Architecture (SNA) protocol, there is no particular reason to bother with ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.