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Figure 213 A bridge in the network
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around in circles endlessly This is avoided by the use of the spanning tree algorithm, common on most bridges today Bridge forwarding rates can limit LAN performance These rates vary by packet size, number of nodes, and protocol mix, so beware of best-case test data from vendors Bridges limit the physical fault domains and the protocol fault domains If you are having a problem within a segment of your network, you must hook the analyzer up to the same segment, or you will not find the problem
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Source route bridges Source route bridges (Table 210 and Figure 214) are TokenRing devices that use a feature of the Token-Ring protocol to route traffic between rings In Figure 214, source routing would be used to communicate between a station on ring 1 and a station on ring 3 Note that if there is a lot of traffic like this, ring 2 is going to get fairly busy just passing traffic between rings 1 and 3 Source route bridges are fairly easy to install and configure compared to a router Source routing is limited to 7 hops (ring transits) If your network is that large, you should consider buying a router or a Token-Ring LAN switch Routers Routers (Figure 215) are the workhorses of the public and private internetworks today They link different subnetworks using the Network layer address, typically IP but sometimes IPX They use routing protocols (OSPF, RIP, IGRP) to communicate with one another, to keep routing tables up to date, and make decisions
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Figure 215 A routed network
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on how to route packets Routers generally have high capacities for traffic forwarding; like bridges, however, their forwarding rates will vary by packet size and by protocol They are used extensively to link to WANs, and also as collapsed backbones As Network layer devices, they can route between a wide variety of protocols: Token-Ring, Ethernet, FDDI, etc Routers often have plug-in interface for many of these media When testing routed networks, you must be on the segment of interest or you will not see the traffic you are looking for ICMP messages give a lot of information about what is going on in an IP-routed network If you have compression turned on for your WAN links, you will not be able to view the traffic with a protocol analyzer (which can be considered a feature if you like secure networks) If you want to do accounting with the router, check that performance is still adequate when accounting is turned on Routers can be complex to configure properly They typically offer sophisticated SNMP-based management tools for configuration and monitoring
Servers Servers (Figure 216) can be used as gateways, security filters, proxy servers, and routers Routing is a common function provided by IPX servers, but it can impact the server s performance Server-based routing performs poorly compared to dedicated routers, but is fine for small networks (This is not universally true, however; a portion of the Internet backbone runs on IBM RS6000 servers) As firewalls, unless they are configured properly, servers can compromise network security; they must be treated with caution when used as an interconnect device As routers, they can have unpredictable results in larger networks; an AppleTalk server, if started with routing turned on, will inform all other routers in the vicinity that all traffic should be forwarded to it LAN switches LAN switches (Figure 217) are basically very fast multiport bridges Full media bandwidth is supplied to each port on the device, and a very fast back-
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