<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html lang="en-us" xml:lang="en-us"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="security" content="public" /> <meta name="Robots" content="index,follow" /> <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))' /> <meta name="DC.Type" content="concept" /> <meta name="DC.Title" content="Enabling application switchover across subnets" /> <meta name="abstract" content="Clustering in general requires that all cluster nodes in the recovery domain of an application cluster resource group reside on the same LAN (use the same subnet addressing)." /> <meta name="description" content="Clustering in general requires that all cluster nodes in the recovery domain of an application cluster resource group reside on the same LAN (use the same subnet addressing)." /> <meta name="DC.Relation" scheme="URI" content="rzaigconfigipaddrressapp.htm" /> <meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" /> <meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" /> <meta name="DC.Format" content="XHTML" /> <meta name="DC.Identifier" content="rzaigconfigdualsubnettakeover" /> <meta name="DC.Language" content="en-us" /> <!-- All rights reserved. Licensed Materials Property of IBM --> <!-- US Government Users Restricted Rights --> <!-- Use, duplication or disclosure restricted by --> <!-- GSA ADP Schedule Contract with IBM Corp. --> <link rel="stylesheet" type="text/css" href="./ibmdita.css" /> <link rel="stylesheet" type="text/css" href="./ic.css" /> <title>Enabling application switchover across subnets</title> </head> <body id="rzaigconfigdualsubnettakeover"><a name="rzaigconfigdualsubnettakeover"><!-- --></a> <!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script> <h1 class="topictitle1">Enabling application switchover across subnets</h1> <div><p>Clustering in general requires that all cluster nodes in the recovery domain of an application cluster resource group reside on the same LAN (use the same subnet addressing).</p> <p>The underlying network protocol used to achieve the switching of the configured application takeover IP address from one node in the recovery domain to another is the Address Resolution Protocol (ARP). However, it is possible to extend the recovery domain to include cluster nodes that reside on other LANs separated by commercial routers.</p> <p>This extension is possible through the use of Virtual IP address support and making use of the Routing Information Protocol (RIP) on the cluster nodes and the commercial routers in the network. See <a href="rzaigapplicationswitchover2.htm">Enabling application switchover</a> for more details.</p> </div> <div> <div class="familylinks"> <div class="parentlink"><strong>Parent topic:</strong> <a href="rzaigconfigipaddrressapp.htm" title="Manage application CRG takeover IP addresses using cluster resource services. You can also manage them manually.">Manage application CRG takeover IP addresses</a></div> </div> </div> </body> </html>