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<h1 class="topictitle1">Communications limits</h1>
<div><p>This topic provides system limits for general communications configuration
limits, SNA limits, TCP/IP limits, and communications trace service tool
limits.</p>
<div class="section"><div class="p">
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="border" border="1" rules="all"><caption>Table 1. General communications
configuration limits</caption><thead align="left"><tr><th valign="top" width="50%" id="d0e23">General communications configuration limits</th>
<th valign="top" width="50%" id="d0e25">Value</th>
</tr>
</thead>
<tbody><tr><td valign="top" width="50%" headers="d0e23 ">Maximum number of communications configuration objects that can be
in a varied on state<sup>1</sup></td>
<td valign="top" width="50%" headers="d0e25 ">Approximately 100 000</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e23 ">Recommended maximum number of devices allocated to an interactive or
communications subsystem</td>
<td valign="top" width="50%" headers="d0e25 ">250 to 300</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e23 ">Maximum number of device descriptions for display devices per subsystem<sup>2</sup></td>
<td valign="top" width="50%" headers="d0e25 "><img src="./delta.gif" alt="Start of change" />Approximately 47 000<img src="./deltaend.gif" alt="End of change" /></td>
</tr>
<tr><td valign="top" width="50%" headers="d0e23 ">Maximum number of virtual devices that can be specified as automatically
configured (QAUTOVRT system value)</td>
<td valign="top" width="50%" headers="d0e25 ">32 500 or *NOMAX</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e23 ">Maximum communications/LAN hardware capabilities</td>
<td valign="top" width="50%" headers="d0e25 ">See <a href="http://www.redbooks.ibm.com/redbooks/pdfs/ga195486.pdf" target="_blank">IBM <br /><img src="eserver.gif" alt="eServer&#xA;logo" /><br /> i5 and iSeries™ Handbook</a>.</td>
</tr>
<tr><td colspan="2" valign="top" headers="d0e23 d0e25 "> <div class="note"><span class="notetitle">Note:</span> <ol><li>A maximum of 32 767 communications configuration objects can be varied
online at IPL per communications arbiter system job (see QCMNARB system value).</li>
<li>Removing generic workstation types in workstation entries can help avoid
this limit. For example, the *ALL workstation type allows the subsystem to
allocate all of the valid workstations on the system. Note that WRKSTNTYP(*ALL)
is the default for some IBM-supplied subsystem descriptions.</li>
</ol>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="section"><div class="p">
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="border" border="1" rules="all"><caption>Table 2. SNA communication
limits</caption><thead align="left"><tr><th valign="top" width="50%" id="d0e88">SNA communication limits</th>
<th valign="top" width="50%" id="d0e90">Value</th>
</tr>
</thead>
<tbody><tr><td valign="top" width="50%" headers="d0e88 ">Maximum number of SNA controllers per LAN line plus the Network controller</td>
<td valign="top" width="50%" headers="d0e90 ">256</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e88 ">Maximum number of SNA CDs across a frame relay network's NWI lines</td>
<td valign="top" width="50%" headers="d0e90 ">256</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e88 ">Maximum number of lines per frame relay NWI</td>
<td valign="top" width="50%" headers="d0e90 ">256</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e88 ">Maximum number of logical channels per X.25 line</td>
<td valign="top" width="50%" headers="d0e90 ">256</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e88 ">Maximum number of controllers on SDLC multidrop lines</td>
<td valign="top" width="50%" headers="d0e90 ">254</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e88 ">Maximum number of communication arbiters (maximum value of QCMNARB
system value)</td>
<td valign="top" width="50%" headers="d0e90 ">99</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e88 ">Maximum number of active sessions per APPC node</td>
<td valign="top" width="50%" headers="d0e90 ">512</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e88 ">Maximum number of modes per APPC device (or APPN location)<sup>1</sup></td>
<td valign="top" width="50%" headers="d0e90 ">14</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e88 ">Maximum combined number of APPC devices (in any state) and APPN devices
(in varied on state)</td>
<td valign="top" width="50%" headers="d0e90 ">25 300</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e88 ">Maximum number of APPN intermediate sessions</td>
<td valign="top" width="50%" headers="d0e90 ">9999</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e88 ">Maximum number of devices per APPC controller</td>
<td valign="top" width="50%" headers="d0e90 ">254</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e88 ">Maximum number of switched lines per APPC controller</td>
<td valign="top" width="50%" headers="d0e90 ">64</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e88 ">Maximum size of APPN local location list</td>
<td valign="top" width="50%" headers="d0e90 ">476</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e88 ">Maximum size of APPN remote location list</td>
<td valign="top" width="50%" headers="d0e90 ">1898</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e88 ">Maximum size of asynchronous network address list</td>
<td valign="top" width="50%" headers="d0e90 ">294</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e88 ">Maximum size of asynchronous remote location list</td>
<td valign="top" width="50%" headers="d0e90 ">32 000</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e88 ">Maximum size of retail pass-through list</td>
<td valign="top" width="50%" headers="d0e90 ">450</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e88 ">Maximum size of SNA pass-through group</td>
<td valign="top" width="50%" headers="d0e90 ">254</td>
</tr>
<tr><td colspan="2" valign="top" headers="d0e88 d0e90 "><strong>Note:</strong> <ol><li><img src="./delta.gif" alt="Start of change" />An APPN location refers to all the devices that have the same
values for RMTLOCNAME, RMTNETID, and LCLLOCNAME.<img src="./deltaend.gif" alt="End of change" /></li>
</ol>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="section"><div class="p">
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="border" border="1" rules="all"><caption>Table 3. TCP/IP communication
limits</caption><thead align="left"><tr><th valign="top" width="50%" id="d0e204">TCP/IP communication limits</th>
<th valign="top" width="50%" id="d0e206">Value</th>
</tr>
</thead>
<tbody><tr><td valign="top" width="50%" headers="d0e204 ">Maximum number of interfaces per line</td>
<td valign="top" width="50%" headers="d0e206 ">2048</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 ">Maximum number of interfaces per system</td>
<td valign="top" width="50%" headers="d0e206 ">16 384</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 ">Maximum number of routes per system</td>
<td valign="top" width="50%" headers="d0e206 ">65 535</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 ">Maximum number of ports for TCP</td>
<td valign="top" width="50%" headers="d0e206 ">65 535</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 ">Maximum number of ports for UDP</td>
<td valign="top" width="50%" headers="d0e206 ">65 535</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 ">Maximum TCP receive buffer size</td>
<td valign="top" width="50%" headers="d0e206 ">8MB</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 ">Maximum TCP send buffer size</td>
<td valign="top" width="50%" headers="d0e206 ">8MB</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 ">Maximum size of a transmission unit on an interface</td>
<td valign="top" width="50%" headers="d0e206 ">16 388 bytes</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 ">Maximum number of TELNET server jobs</td>
<td valign="top" width="50%" headers="d0e206 ">200</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 ">Maximum number of TELNET server sessions</td>
<td valign="top" width="50%" headers="d0e206 ">Maximum number of virtual devices</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 ">Default maximum number of socket and file descriptors per job <sup>1</sup></td>
<td valign="top" width="50%" headers="d0e206 ">200</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 ">Maximum number of socket and file descriptors per job</td>
<td valign="top" width="50%" headers="d0e206 ">2 500 000</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 ">Maximum number of socket descriptors on the system</td>
<td valign="top" width="50%" headers="d0e206 ">Approximately 46 420 000</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 ">Maximum size of database files for FTP</td>
<td valign="top" width="50%" headers="d0e206 ">1 terabyte</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 ">Maximum size of integrated file system files for FTP</td>
<td valign="top" width="50%" headers="d0e206 ">Amount of storage</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 ">Maximum number of recipients for SMTP</td>
<td valign="top" width="50%" headers="d0e206 ">14 000</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 ">Maximum number of simultaneous inbound connections for SMTP</td>
<td valign="top" width="50%" headers="d0e206 ">Approximately 32 000 (1 connection per prestart job)</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 ">Maximum number of simultaneous outbound connections
for SMTP</td>
<td valign="top" width="50%" headers="d0e206 ">Approximately 32 000 (1 connection per prestart
job plus 1 listening)</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 ">Maximum number of MX records handled by MX resolver (Client) for SMTP</td>
<td valign="top" width="50%" headers="d0e206 ">80</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 ">Maximum document size for SMTP</td>
<td valign="top" width="50%" headers="d0e206 ">2.1 gigabytes</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 ">Maximum number of active threads per HTTP server</td>
<td valign="top" width="50%" headers="d0e206 ">9999</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 ">Maximum number of connections that can be displayed using WRKTCPSTS
or NETSTAT commands</td>
<td valign="top" width="50%" headers="d0e206 ">32 767</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 "><img src="./delta.gif" alt="Start of change" />Maximum number of L2TP tunnels per system<img src="./deltaend.gif" alt="End of change" /></td>
<td valign="top" width="50%" headers="d0e206 "><img src="./delta.gif" alt="Start of change" />200<img src="./deltaend.gif" alt="End of change" /></td>
</tr>
<tr><td valign="top" width="50%" headers="d0e204 "><img src="./delta.gif" alt="Start of change" />Maximum number of calls per L2TP tunnel<img src="./deltaend.gif" alt="End of change" /></td>
<td valign="top" width="50%" headers="d0e206 "><img src="./delta.gif" alt="Start of change" />200<img src="./deltaend.gif" alt="End of change" /></td>
</tr>
<tr><td colspan="2" valign="top" headers="d0e204 d0e206 "> <div class="note"><span class="notetitle">Note:</span> <ol><li>Default can be changed with <a href="../apis/dossrmfh.htm">DosSetRelMaxFH()</a> - Change the Maximum Number of File
Descriptors (see <a href="../apis/unix.htm">UNIX-Type
APIs</a> in the Information Center).</li>
</ol>
</div>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="section"><div class="p">
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="border" border="1" rules="all"><caption>Table 4. Communications trace
service tool limits</caption><thead align="left"><tr><th valign="top" width="50%" id="d0e356">Communications trace service tool limits</th>
<th valign="top" width="50%" id="d0e358">Value</th>
</tr>
</thead>
<tbody><tr><td valign="top" width="50%" headers="d0e356 ">Maximum amount of storage allocated for a single communications trace
buffer</td>
<td valign="top" width="50%" headers="d0e358 ">1 gigabyte</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e356 ">Maximum total amount of storage allocated for all communications trace
buffers</td>
<td valign="top" width="50%" headers="d0e358 ">4 gigabytes</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e356 ">Maximum number of active traces per multiline IOP on pre-V4R1 IOP hardware
(limit is removed with new V4R1 IOP hardware)</td>
<td valign="top" width="50%" headers="d0e358 ">2</td>
</tr>
<tr><td valign="top" width="50%" headers="d0e356 ">Maximum record size when using the TRCTCPAPP trace tool for Host Server
and DDM/DRDA Server</td>
<td valign="top" width="50%" headers="d0e358 ">6000 bytes</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</div>
<div>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzampoverview.htm" title="If you exceed system limitations you can experience an application outage or a system outage. Avoid these types of outages by being aware of the maximum capacities and system limitations in advance.">Maximum capacities</a></div>
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