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HTML
192 lines
12 KiB
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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.Title" content="Maximum frame-size parameter requirements for frame relay" />
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<meta name="abstract" content="This topic helps you determine the value of the maximum frame size." />
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<meta name="description" content="This topic helps you determine the value of the maximum frame size." />
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<title>Maximum frame-size parameter requirements for frame relay</title>
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</head>
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<body id="rzak3sizeconsid"><a name="rzak3sizeconsid"><!-- --></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">Maximum frame-size parameter requirements for frame relay</h1>
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<div><p>This topic helps you determine the value of the maximum frame size.</p>
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<p>The frame-relay network provider defines and typically
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establishes a tariff for the frame information field size provided. This size
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is referred to as <em>N203</em>. Use the N203 value to determine the value specified
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for the IBM<sup>®</sup> <span><img src="eserver.gif" alt="eServer" /></span> iSeries™ maximum frame size (MAXFRAME
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parameter).</p>
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<p>The MAXFRAME parameter specifies the maximum protocol data unit (PDU) that
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the system transmits or receives. The iSeries system supports MAXFRAME values
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from 262 to 8192 bytes. The common N203 frame size that all networks and attached
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equipment support is 1600 bytes.</p>
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<p>When configuring the MAXFRAME value, you must
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take into account the amount of overhead required for the various line types
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and their associated protocol headers. The length of these headers varies,
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depending on the type of frame-relay connection. For example, bridged connections
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typically require a longer header than that used for Systems Network Architecture
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(SNA) direct because these headers must include source and destination adapter
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addresses. Distributed data interface (DDI) and token-ring connections also
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include up to 18 bytes of routing information.</p>
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<p><a href="#rzak3sizeconsid__rzak3header">Table 1</a> shows
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the number of bytes required for the various frame-relay header types.</p>
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<div class="tablenoborder"><a name="rzak3sizeconsid__rzak3header"><!-- --></a><table cellpadding="4" cellspacing="0" summary="" id="rzak3sizeconsid__rzak3header" class="singleborder" width="100%" frame="border" border="1" rules="all"><caption>Table 1. Lengths for 802.2, remote LAN, and frame-relay
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headers</caption><thead align="left"><tr><th rowspan="2" align="left" valign="top" width="12.73100616016427%" id="d0e58">Connection type and protocol</th>
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<th rowspan="2" align="left" valign="top" width="9.240246406570842%" id="d0e60">802.2 LLC header</th>
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<th colspan="4" align="center" valign="middle" id="d0e62">Remote
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LAN headers</th>
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<th colspan="3" align="center" valign="middle" id="d0e64">Frame-relay
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headers</th>
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<th rowspan="2" align="center" valign="top" width="10.061601642710473%" id="d0e66">Total bytes</th>
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</tr>
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<tr><th align="center" valign="top" width="6.570841889117044%" id="d0e69">RI</th>
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<th align="center" valign="top" width="6.570841889117044%" id="d0e71">AC/AF</th>
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<th align="center" valign="top" width="13.347022587268995%" id="d0e73">Type/Length</th>
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<th align="center" valign="top" width="10.266940451745379%" id="d0e75">DA/SA</th>
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<th align="center" valign="top" width="10.472279260780287%" id="d0e77">C/NLPID</th>
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<th align="center" valign="top" width="10.061601642710473%" id="d0e79">OUI/PID</th>
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<th align="center" valign="top" width="10.677618069815194%" id="d0e81">L2/L3</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" width="12.73100616016427%" headers="d0e58 ">SNA direct</td>
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<td align="center" valign="top" width="9.240246406570842%" headers="d0e60 ">4</td>
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<td valign="top" width="6.570841889117044%" headers="d0e62 d0e69 "> </td>
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<td valign="top" width="6.570841889117044%" headers="d0e62 d0e71 "> </td>
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<td valign="top" width="13.347022587268995%" headers="d0e62 d0e73 "> </td>
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<td valign="top" width="10.266940451745379%" headers="d0e62 d0e75 "> </td>
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<td align="center" valign="top" headers="d0e64 d0e77 ">2</td>
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<td valign="top" width="10.061601642710473%" headers="d0e64 d0e79 "> </td>
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<td align="center" valign="top" headers="d0e64 d0e81 ">4</td>
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<td align="center" valign="top" width="10.061601642710473%" headers="d0e66 ">10</td>
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</tr>
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<tr><td align="left" valign="top" width="12.73100616016427%" headers="d0e58 ">IP direct</td>
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<td valign="top" width="9.240246406570842%" headers="d0e60 "> </td>
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<td valign="top" width="6.570841889117044%" headers="d0e62 d0e69 "> </td>
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<td valign="top" width="6.570841889117044%" headers="d0e62 d0e71 "> </td>
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<td valign="top" width="13.347022587268995%" headers="d0e62 d0e73 "> </td>
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<td valign="top" width="10.266940451745379%" headers="d0e62 d0e75 "> </td>
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<td align="center" valign="top" headers="d0e64 d0e77 ">2</td>
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<td valign="top" width="10.061601642710473%" headers="d0e64 d0e79 "> </td>
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<td valign="top" width="10.677618069815194%" headers="d0e64 d0e81 "> </td>
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<td align="center" valign="top" headers="d0e66 ">2</td>
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</tr>
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<tr><td align="left" valign="top" width="12.73100616016427%" headers="d0e58 ">HPR</td>
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<td valign="top" width="9.240246406570842%" headers="d0e60 "> </td>
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<td valign="top" width="6.570841889117044%" headers="d0e62 d0e69 "> </td>
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<td valign="top" width="6.570841889117044%" headers="d0e62 d0e71 "> </td>
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<td valign="top" width="13.347022587268995%" headers="d0e62 d0e73 "> </td>
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<td valign="top" width="10.266940451745379%" headers="d0e62 d0e75 "> </td>
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<td align="center" valign="top" headers="d0e64 d0e77 ">2</td>
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<td valign="top" width="10.061601642710473%" headers="d0e64 d0e79 "> </td>
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<td align="center" valign="top" headers="d0e64 d0e81 ">4</td>
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<td align="center" valign="top" width="10.061601642710473%" headers="d0e66 ">6</td>
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</tr>
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<tr><td align="left" valign="top" width="12.73100616016427%" headers="d0e58 ">Bridged token-ring</td>
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<td align="center" valign="top" width="9.240246406570842%" headers="d0e60 ">4</td>
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<td align="center" valign="top" width="6.570841889117044%" headers="d0e62 d0e69 ">18</td>
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<td align="center" valign="top" width="6.570841889117044%" headers="d0e62 d0e71 ">2</td>
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<td valign="top" width="13.347022587268995%" headers="d0e62 d0e73 "> </td>
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<td align="center" valign="top" headers="d0e62 d0e75 ">12</td>
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<td align="center" valign="top" width="10.472279260780287%" headers="d0e64 d0e77 ">3</td>
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<td align="center" valign="top" width="10.061601642710473%" headers="d0e64 d0e79 ">5</td>
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<td valign="top" width="10.677618069815194%" headers="d0e64 d0e81 "> </td>
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<td align="center" valign="top" headers="d0e66 ">44</td>
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</tr>
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<tr><td align="left" valign="top" width="12.73100616016427%" headers="d0e58 ">Bridged DDI</td>
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<td align="center" valign="top" width="9.240246406570842%" headers="d0e60 ">4</td>
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<td align="center" valign="top" width="6.570841889117044%" headers="d0e62 d0e69 ">18</td>
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<td align="center" valign="top" width="6.570841889117044%" headers="d0e62 d0e71 ">2</td>
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<td valign="top" width="13.347022587268995%" headers="d0e62 d0e73 "> </td>
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<td align="center" valign="top" headers="d0e62 d0e75 ">12</td>
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<td align="center" valign="top" width="10.472279260780287%" headers="d0e64 d0e77 ">3</td>
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<td align="center" valign="top" width="10.061601642710473%" headers="d0e64 d0e79 ">5</td>
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<td valign="top" width="10.677618069815194%" headers="d0e64 d0e81 "> </td>
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<td align="center" valign="top" headers="d0e66 ">44</td>
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</tr>
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<tr><td align="left" valign="top" width="12.73100616016427%" headers="d0e58 ">Bridged IEEE 802.3</td>
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<td align="center" valign="top" width="9.240246406570842%" headers="d0e60 ">4</td>
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<td valign="top" width="6.570841889117044%" headers="d0e62 d0e69 "> </td>
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<td valign="top" width="6.570841889117044%" headers="d0e62 d0e71 "> </td>
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<td align="center" valign="top" headers="d0e62 d0e73 ">2</td>
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<td align="center" valign="top" width="10.266940451745379%" headers="d0e62 d0e75 ">12</td>
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<td align="center" valign="top" width="10.472279260780287%" headers="d0e64 d0e77 ">3</td>
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<td align="center" valign="top" width="10.061601642710473%" headers="d0e64 d0e79 ">5</td>
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<td valign="top" width="10.677618069815194%" headers="d0e64 d0e81 "> </td>
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<td align="center" valign="top" headers="d0e66 ">26</td>
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</tr>
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<tr><td align="left" valign="top" width="12.73100616016427%" headers="d0e58 ">Bridged Ethernet V2</td>
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<td valign="top" width="9.240246406570842%" headers="d0e60 "> </td>
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<td valign="top" width="6.570841889117044%" headers="d0e62 d0e69 "> </td>
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<td valign="top" width="6.570841889117044%" headers="d0e62 d0e71 "> </td>
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<td align="center" valign="top" headers="d0e62 d0e73 ">2</td>
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<td align="center" valign="top" width="10.266940451745379%" headers="d0e62 d0e75 ">12</td>
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<td align="center" valign="top" width="10.472279260780287%" headers="d0e64 d0e77 ">3</td>
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<td align="center" valign="top" width="10.061601642710473%" headers="d0e64 d0e79 ">5</td>
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<td valign="top" width="10.677618069815194%" headers="d0e64 d0e81 "> </td>
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<td align="center" valign="top" headers="d0e66 ">22</td>
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</tr>
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<tr><td colspan="10" align="left" valign="top" headers="d0e58 d0e60 d0e62 d0e64 d0e66 d0e69 d0e71 d0e73 d0e75 d0e77 d0e79 d0e81 ">Abbreviations
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used: <dl><dt class="dlterm">RI</dt>
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<dd>Routing information</dd>
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<dt class="dlterm">AC/FC</dt>
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<dd>Access control (AC) and frame control (FC)</dd>
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<dt class="dlterm">DA/SA</dt>
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<dd>Destination address (DA) and source address (SA)</dd>
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<dt class="dlterm">C/NLPID</dt>
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<dd>Q.922 control field (C), Network Level Protocol Identifier (NLPID), and
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optional PAD</dd>
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<dt class="dlterm">OUI/PID</dt>
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<dd>Organization Unique ID (OUI) and Protocol Identifier (PID)</dd>
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<dt class="dlterm">L2/L3</dt>
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<dd>Layer 2 (L2) and Layer 3 (L3) Protocol</dd>
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<dt class="dlterm">HPR</dt>
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<dd>High-Performance Routing</dd>
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</dl>
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</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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<p>The MAXFRAME value configured for the line description must equal the N203
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value subscribed to from the network minus the total length of the header
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for the connection type and protocol. For example:</p>
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<ul><li>If the N203 subscription is 1600 and you are configuring for SNA direct
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communications, the MAXFRAME value specified on the CRTLINFR command should
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be set to 1590 (1600 – 10 bytes).</li>
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<li>If the N203 subscription is 8192 and you are configuring a bridged frame-relay
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connection to a token-ring network, the MAXFRAME value specified on the CRTLINTRN
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command should be set to 8148 (8192 – 44 bytes).</li>
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</ul>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzak3rzak3addmaxframe.htm">Additional MAXFRAME parameter considerations</a></strong><br />
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</li>
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</ul>
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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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