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