Free Windows Help Tutorials sponsored by inkjet printer cartridges dot org /title> <META HTTP-EQUIV="imagetoolbar" CONTENT="no"> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; CHARSET=ISO 8859-1"> <META name="description" Content="Hundreds of downloadable Windows help tutorials, articles and how-to guides sponsored by inkjet printer cartridges dot org."><style type="text/css">  </style> </head> <body bgcolor=#999999 vlink=blue link=blue> <span name = "INTRA" class="pg" style="top:0px; left:5px; width:714px; height:1010px"></span> <span name = "INTRA" style='top:0px; left:5px; height:1010px; width:714px' class='img'> <img src="pg0001im.png" height = "1010 width = "714" border="0"> </span> <span class='nav' style='left: 10px; top: 10px'><pre></pre></span><span name = "INTRA" style='top:51px; left:550px' class="ft5"><pre><font face='Helvetica'>Problem Solving:Overview</font></pre></span> <span name = "INTRA" style='top:104px; left:171px' class="ft3"><pre><font face='Arial'><b>How</b> <b>To</b> <b>Manage</b></font></pre></span> <span name = "INTRA" style='top:154px; left:182px' class="ft3"><pre><font face='Arial'><b>Switched</b> <b>LANs</b></font></pre></span> <span name = "INTRA" style='top:248px; left:99px' class="ft2"><pre><font face='Arial'><i><b>More</b></i> <i><b>and</b></i> <i><b>more</b></i> <i><b>companies</b></i> <i><b>are</b></i> <i><b>now</b></i> <i><b>replacing</b></i> <i><b>older</b></i> <i><b>10</b></i> <i><b>MB/sec</b></i> <i><b>Ethernet</b></i> <i><b>systems</b></i> <i><b>with</b></i> <i><b>faster,</b></i></font></pre></span> <span name = "INTRA" style='top:268px; left:107px' class="ft2"><pre><font face='Arial'><i><b>switched</b></i> <i><b>alternatives.</b></i> <i><b>But</b></i> <i><b>while</b></i> <i><b>these</b></i> <i><b>solutions</b></i> <i><b>offer</b></i> <i><b>greater</b></i> <i><b>flexibility</b></i> <i><b>they</b></i> <i><b>need</b></i> <i><b>careful</b></i></font></pre></span> <span name = "INTRA" style='top:289px; left:109px' class="ft2"><pre><font face='Arial'><i><b>management</b></i> <i><b>in</b></i> <i><b>order</b></i> <i><b>to</b></i> <i><b>ensure</b></i> <i><b>optimum</b></i> <i><b>performance.</b></i> <i><b>Concluding</b></i> <i><b>our</b></i> <i><b>two part</b></i> <i><b>article.</b></i></font></pre></span> <span name = "INTRA" style='top:321px; left:570px' class="ft1"><pre><font face='Arial'>By Linda Davies</font></pre></span> <span name = "INTRA" style='top:384px; left:77px' class="ft0"><pre><font face='Arial'><b>D</b></font></pre></span> <span name = "INTRA" style='top:388px; left:117px' class="ft1"><pre><font face='Arial'>ifferent switches have different</font></pre></span> <span name = "INTRA" style='top:400px; left:117px' class="ft1"><pre><font face='Arial'>features and are better suited to</font></pre></span> <span name = "INTRA" style='top:412px; left:117px' class="ft1"><pre><font face='Arial'>some tasks than others. Some</font></pre></span> <span name = "INTRA" style='top:424px; left:77px' class="ft1"><pre><font face='Arial'>switch designs lend themselves to a</font></pre></span> <span name = "INTRA" style='top:437px; left:77px' class="ft1"><pre><font face='Arial'> high speed backbone in a box type of</font></pre></span> <span name = "INTRA" style='top:449px; left:77px' class="ft1"><pre><font face='Arial'>use, whereas others may be designed</font></pre></span> <span name = "INTRA" style='top:461px; left:77px' class="ft1"><pre><font face='Arial'>with the intent of micro segmentation.</font></pre></span> <span name = "INTRA" style='top:473px; left:77px' class="ft1"><pre><font face='Arial'>There are several techniques of switched</font></pre></span> <span name = "INTRA" style='top:485px; left:77px' class="ft1"><pre><font face='Arial'>implementation the final choice will</font></pre></span> <span name = "INTRA" style='top:497px; left:77px' class="ft1"><pre><font face='Arial'>depend on the application, the existing</font></pre></span> <span name = "INTRA" style='top:509px; left:77px' class="ft1"><pre><font face='Arial'>resources and the desired end result.</font></pre></span> <span name = "INTRA" style='top:534px; left:77px' class="ft2"><pre><font face='Arial'><i><b>Collapsed</b></i> <i><b>Backbone</b></i></font></pre></span> <span name = "INTRA" style='top:557px; left:91px' class="ft1"><pre><font face='Arial'>A high speed switch can be used as a</font></pre></span> <span name = "INTRA" style='top:569px; left:77px' class="ft1"><pre><font face='Arial'>collapsed backbone, as shown in Figure</font></pre></span> <span name = "INTRA" style='top:581px; left:77px' class="ft1"><pre><font face='Arial'>3. Each router is being used to isolate</font></pre></span> <span name = "INTRA" style='top:593px; left:77px' class="ft1"><pre><font face='Arial'>segment traffic from other segments.</font></pre></span> <span name = "INTRA" style='top:605px; left:77px' class="ft1"><pre><font face='Arial'>Connecting all of the routers to a shared</font></pre></span> <span name = "INTRA" style='top:617px; left:77px' class="ft1"><pre><font face='Arial'>medium, even a high speed medium,</font></pre></span> <span name = "INTRA" style='top:615px; left:303px' class="ft1"><pre><font face='Arial'>Figure 3 A high speed switch can be used as a collapsed backbone</font></pre></span> <span name = "INTRA" style='top:629px; left:77px' class="ft1"><pre><font face='Arial'>could cause congestion as bandwidth</font></pre></span> <span name = "INTRA" style='top:629px; left:408px' class="ft1"><pre><font face='Arial'>to interconnect routers.</font></pre></span> <span name = "INTRA" style='top:641px; left:77px' class="ft1"><pre><font face='Arial'>demands on the backbone increase. Di </font></pre></span> <span name = "INTRA" style='top:653px; left:77px' class="ft1"><pre><font face='Arial'>rectly connecting the routers to each</font></pre></span> <span name = "INTRA" style='top:665px; left:77px' class="ft1"><pre><font face='Arial'>other would be effective, but is poten </font></pre></span> <span name = "INTRA" style='top:677px; left:77px' class="ft1"><pre><font face='Arial'>tially more expensive and is not scalable.</font></pre></span> <span name = "INTRA" style='top:689px; left:91px' class="ft1"><pre><font face='Arial'>Providing that the routers are only</font></pre></span> <span name = "INTRA" style='top:701px; left:77px' class="ft1"><pre><font face='Arial'>routing traffic and not bridging, the</font></pre></span> <span name = "INTRA" style='top:713px; left:77px' class="ft1"><pre><font face='Arial'>backbone switch in this scenario may</font></pre></span> <span name = "INTRA" style='top:725px; left:77px' class="ft1"><pre><font face='Arial'>be a single MAC (Module Address</font></pre></span> <span name = "INTRA" style='top:737px; left:77px' class="ft1"><pre><font face='Arial'>Card) device. However, if the routers</font></pre></span> <span name = "INTRA" style='top:749px; left:77px' class="ft1"><pre><font face='Arial'>are bridging traffic, the backbone</font></pre></span> <span name = "INTRA" style='top:761px; left:77px' class="ft1"><pre><font face='Arial'>switch must be multi MAC and have</font></pre></span> <span name = "INTRA" style='top:773px; left:77px' class="ft1"><pre><font face='Arial'>an address table large enough to buffer</font></pre></span> <span name = "INTRA" style='top:785px; left:77px' class="ft1"><pre><font face='Arial'>the addresses of all the devices that</font></pre></span> <span name = "INTRA" style='top:797px; left:77px' class="ft1"><pre><font face='Arial'>may propagate bridged traffic. If the</font></pre></span> <span name = "INTRA" style='top:809px; left:77px' class="ft1"><pre><font face='Arial'>switch is a single MAC device it should</font></pre></span> <span name = "INTRA" style='top:821px; left:77px' class="ft1"><pre><font face='Arial'>only be connected to either the work </font></pre></span> <span name = "INTRA" style='top:833px; left:77px' class="ft1"><pre><font face='Arial'>group routers or resources that are</font></pre></span> <span name = "INTRA" style='top:845px; left:77px' class="ft1"><pre><font face='Arial'>shared by the entire enterprise network,</font></pre></span> <span name = "INTRA" style='top:857px; left:77px' class="ft1"><pre><font face='Arial'>such as external routers or file servers.</font></pre></span> <span name = "INTRA" style='top:883px; left:77px' class="ft2"><pre><font face='Arial'><i><b>Segmentation</b></i></font></pre></span> <span name = "INTRA" style='top:893px; left:312px' class="ft1"><pre><font face='Arial'>Figure 4 A high speed switch can be used to segment network</font></pre></span> <span name = "INTRA" style='top:905px; left:91px' class="ft1"><pre><font face='Arial'>Switches can be used to segment the</font></pre></span> <span name = "INTRA" style='top:906px; left:304px' class="ft1"><pre><font face='Arial'>workgroups and provide high bandwidth pipes to shared resources.</font></pre></span> <span name = "INTRA" style='top:946px; left:52px' class="ft1"><pre><font face='Arial'>Issue 97 (July 1998) page 19</font></pre></span> <span name = "INTRA" style='top:946px; left:611px' class="ft1"><pre><font face='Arial'>File: P04109.3</font></pre></span> <span name = "INTRA" style='top:944px; left:261px' class="ft4"><pre><font face='Arial'><b>PC</b> <b>Network</b> <b>Advisor</b></font></pre></span> <span name = "INTRA" class='nav' style='left: 357px; top: 1010px'><pre>Next page <a href='page0002.htm'>></a></pre></span> <span name = "INTRA" style='top:1050px; left:50px' class="ft4"><pre><b><font color="#FF0000" size="3" face="Arial">New!</font><font color="#FF0000" size="3" face="Arial Narrow"> </font><font size="2" face="Arial">The best sites for quality <a href="http://www.inkjet-printer-cartridges.org">inkjet printer cartridges</a> and the best sites for <a href="http://www.cheap-inkjet-cartridges.com">cheap inkjet cartridges</a></font></b></pre></span></body> <span name = "INTRA" style='top:1100px; left:300px' class="ft4"><pre><b><font color="#FF0000" size="3" face="Arial"><a href="../index.html">Windows Help Desk Home</a> </font></b></pre></span></body></html>