66 lines
3.7 KiB
HTML
66 lines
3.7 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Fault tolerance" />
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<meta name="abstract" content="Fault tolerance shows several different ways a route might be recovered after an outage." />
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<meta name="description" content="Fault tolerance shows several different ways a route might be recovered after an outage." />
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<meta name="DC.Relation" scheme="URI" content="rzajwrcb.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzajwfault" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Fault tolerance</title>
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</head>
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<body id="rzajwfault"><a name="rzajwfault"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Fault tolerance</h1>
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<div><p>Fault tolerance shows several different ways a route might be recovered
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after an outage.</p>
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<p>Another use for virtual IP addresses is to protect against route fault
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tolerance.</p>
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<p>This example shows several different ways a route can be recovered after
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an outage. The most reliable connection is when a virtual IP address is defined
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on the system. With virtual IP's support, even if an interface fails, the
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session can still communicate using different interfaces.</p>
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<br /><img src="rzajw512.gif" alt="Fault tolerance" /><br /><div class="section"><h4 class="sectiontitle">What happens if router R1 fails?</h4><ul><li>Connections through R1 are rerouted through R2.</li>
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<li>The failed gateway will detect R1 recovery, but active connections will
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continue to run through R2.</li>
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</ul>
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</div>
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<div class="section"><h4 class="sectiontitle">What happens if interface 10.1.1.1 fails?</h4><ul><li>Active connections to 10.1.1.1 are lost, but other connections to 10.1.1.2,
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10.1.1.3, and 10.2.1.1 remain.</li>
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<li>Route rebinding: <ul><li>Pre-V4R2: Indirect routes are rebound to 10.1.1.2 or 10.1.1.3.</li>
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<li>V4R2: Routes are rebound only if Preferred Binding Interface is set to
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NONE.</li>
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<li>V4R3 and higher: You need to define 10.2.1.1 as the virtual IP address
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and primary system address. <ul><li>The primary IP address of the system remains active.</li>
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<li>The system stays accessible as long as at least one physical interface
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remains active.</li>
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</ul>
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</li>
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</ul>
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</li>
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</ul>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzajwrcb.htm" title="Routing deals with what path the network traffic follows from its source to its destination and how that path is connected.">Routing connectivity methods</a></div>
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</div>
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</div>
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</body>
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</html>
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