<?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="reference" /> <meta name="DC.Title" content="Tune frame-relay performance" /> <meta name="abstract" content="This topic provides information about adjusting parameters for greater network performance." /> <meta name="description" content="This topic provides information about adjusting parameters for greater network performance." /> <meta name="DC.Relation" scheme="URI" content="rzak3overview.htm" /> <meta name="copyright" content="(C) Copyright IBM Corporation 2000, 2006" /> <meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2000, 2006" /> <meta name="DC.Format" content="XHTML" /> <meta name="DC.Identifier" content="rzak3perftunparms" /> <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>Tune frame-relay performance</title> </head> <body id="rzak3perftunparms"><a name="rzak3perftunparms"><!-- --></a> <!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script> <h1 class="topictitle1">Tune frame-relay performance</h1> <div><p><span>This topic provides information about adjusting parameters for greater network performance.</span></p> <div class="section"><p>Advanced Program-to-Program Communication (APPC) and Systems Network Architecture (SNA) host controller descriptions allow the specification of a group of LANxxxxxx parameters to provide performance-tuning capabilities for both local area network (LAN) and frame-relay connections. Because frame-relay networks operate at slower speeds than LANs, it might be necessary to adjust some of these parameters when you use the controller description for frame-relay connections.</p> </div> <div class="section"><p>If you specify the default value, *CALC, for the LANxxxxxx parameters, then the IBM<sup>®</sup> <span><img src="eserver.gif" alt="eServer" /></span> iSeries™ system automatically uses the values recommended for frame-relay connections. The system adjusts these values to allow for network delays. For example, the system might reduce them when using a high-speed network running at J1, T1, or E1 speeds. Reducing these values allows quicker error detection, but it also reduces the time allowed for error recovery.</p> </div> <div class="section"><p>You can display the values that the system chooses by using the Display Controller Description (DSPCTLD) command when the controller is active. <a href="#rzak3perftunparms__rzak3calc">Table 1</a> shows the values used for frame-relay connections when you specify *CALC for the LANxxxxxx parameters.</p> </div> <div class="tablenoborder"><a name="rzak3perftunparms__rzak3calc"><!-- --></a><table cellpadding="4" cellspacing="0" summary="" id="rzak3perftunparms__rzak3calc" class="singleborder" frame="border" border="1" rules="all"><caption>Table 1. *CALC values for controller description performance parameters</caption><thead align="left"><tr><th align="left" valign="top" width="33.33333333333333%" id="d0e45">Parameter</th> <th align="left" valign="top" width="33.33333333333333%" id="d0e47">Function</th> <th align="left" valign="top" width="33.33333333333333%" id="d0e49">*CALC value</th> </tr> </thead> <tbody><tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e45 ">LANCNNTMR</td> <td align="left" valign="top" width="33.33333333333333%" headers="d0e47 ">Sets wait time for polling remote station.</td> <td align="left" valign="top" width="33.33333333333333%" headers="d0e49 ">20 seconds</td> </tr> <tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e45 ">LANCNNRTY</td> <td align="left" valign="top" width="33.33333333333333%" headers="d0e47 ">Sets number of poll retries sent to remote station.</td> <td align="left" valign="top" width="33.33333333333333%" headers="d0e49 ">10</td> </tr> <tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e45 ">LANRSPTMR</td> <td align="left" valign="top" width="33.33333333333333%" headers="d0e47 ">Sets wait time for frame retransmission.</td> <td align="left" valign="top" width="33.33333333333333%" headers="d0e49 ">20 seconds</td> </tr> <tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e45 ">LANFRMRTY</td> <td align="left" valign="top" width="33.33333333333333%" headers="d0e47 ">Sets number of frame retransmission attempts.</td> <td align="left" valign="top" width="33.33333333333333%" headers="d0e49 ">10</td> </tr> <tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e45 ">LANACKTMR</td> <td align="left" valign="top" width="33.33333333333333%" headers="d0e47 ">Sets wait time for acknowledgment to remote station.</td> <td align="left" valign="top" width="33.33333333333333%" headers="d0e49 ">1 second</td> </tr> <tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e45 ">LANACKFRQ</td> <td align="left" valign="top" width="33.33333333333333%" headers="d0e47 ">Sets number of frames received before sending acknowledgment.</td> <td align="left" valign="top" width="33.33333333333333%" headers="d0e49 ">1</td> </tr> <tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e45 ">LANINACTMR</td> <td align="left" valign="top" width="33.33333333333333%" headers="d0e47 ">Sets wait time for requesting response from remote station.</td> <td align="left" valign="top" width="33.33333333333333%" headers="d0e49 ">25 seconds</td> </tr> <tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e45 ">LANMAXOUT</td> <td align="left" valign="top" width="33.33333333333333%" headers="d0e47 ">Sets number of outstanding frames allowed before requesting acknowledgment from remote station.</td> <td align="left" valign="top" width="33.33333333333333%" headers="d0e49 ">2</td> </tr> <tr><td align="left" valign="top" width="33.33333333333333%" headers="d0e45 ">LANWDWSTP</td> <td align="left" valign="top" width="33.33333333333333%" headers="d0e47 ">Provides an alternative value equivalent to the LANMAXOUT parameter for use during periods of network congestion. The system provides an algorithm for returning the effective maximum outstanding frames value to that specified by the LANMAXOUT parameter as congestion subsides.</td> <td align="left" valign="top" width="33.33333333333333%" headers="d0e49 ">*NONE</td> </tr> </tbody> </table> </div> <div class="section"><p>It should be noted that you might receive better performance with a larger frame size. In a mixed LAN and wide area network (WAN) environment, it might help to put CP Session support on the faster LAN controllers rather than the WAN controllers. The more data link connection identifiers (DLCIs) you have per network interface (NWI), the poorer the performance you have per DLCI. </p> </div> </div> <div> <div class="familylinks"> <div class="parentlink"><strong>Parent topic:</strong> <a href="rzak3overview.htm">Frame relay</a></div> </div> </div> </body> </html>