Configure Persistent Logging on IOS Platforms

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All of the devices used in this document started with a cleared (default) configuration. If your network is live, ensure that you understand the potential impact of any command.</span></p><h2 id="toc-hId-61999489"></h2><h2 id="toc-hId-1804809824">Background Information</h2><p>Typically, logging messages (warnings, error and/or debugs, and so on) are stored in a router's memory buffer (DRAM); when the buffer is full, older messages are overwritten by new messages. This poses an issue  when trying to capture debugs for an intermittent issue or during high traffic. Huge buffer size configuration can not always help as the buffer can get filled and overwritten quickly during verbose debugging. Using persistent logging allows to write logged messages to  file(s) on router's flash disk. The advantage is unlike memory buffer (DRAM) contents these files persist when the router reboots (DRAM contents are erased during a reboot.)</p><p>  </p><h2 id="toc-hId--747347137">Configure</h2><p> Step 1. Enable system logging message to a local buffer:</p><p>         logging buffered [buffer-size | level]</p><p>Step 2. Enable logging messages in order to write from the memory buffer to router's flash disk:</p><p>           logging persistent [ batch batch-size ] { filesize logging-file-size } [ immediate ] { notify } [ protected ] { size filesystem-size } [ threshold threshold-capacity [ alert ] ] [ url { disk0:/directory | disk1:/directory } ]</p><div style="border-top: 1px solid #ccc; border-bottom: 1px solid #ccc; padding: 10px; margin-top: 20px;"><img style="margin-top: -10px;" class="custom-image-class" src="https://www.cisco.com/c/dam/en/us/td/i/templates/note.gif" border="0" alt="note-icon"/> <div style="margin-left: 38px; margin-top: -25px;"> <p><strong>Note</strong>: Amount of disk storage allocated (filesystem-size) and size of individual logging file (logging-file-size) are specified in bytes.</p> </div> </div><p>Step 3. Enable desired debugs [optional]</p><div style="border-top: 1px solid #ccc; border-bottom: 1px solid #ccc; padding: 10px; margin-top: 20px;"><img style="margin-top: -10px;" class="custom-image-class" src="https://www.cisco.com/c/dam/en/us/td/i/templates/note.gif" border="0" alt="note-icon"/> <div style="margin-left: 38px; margin-top: -25px;"> <p><strong>Note</strong>: The filename format is <strong>log_YYYYMMDD-HHMMSS</strong> (For example: log_20130927-112427)</p> </div> </div><h3 id="toc-hId-798949693">Configuration Example</h3><p>  </p><pre> Router(config)#logging buffer 20000000 debugging<br /> Router(config)#logging persistent url flash0:/MYDEBUGS size 104857600 filesize 5242880</pre><p>The previous command creates a directory called MYDEBUGS on the router's disk 0 and allocates 104857600 bytes (100MB) disk space for log messages and specifies an individual file size of 5MB.</p><div style="border-top: 1px solid #ccc; border-bottom: 1px solid #ccc; padding: 10px; margin-top: 20px;"><img style="margin-top: -10px;" class="custom-image-class" src="https://www.cisco.com/c/dam/en/us/td/i/templates/caut.gif" border="0" alt="caution-icon"/> <div style="margin-left: 38px; margin-top: -25px;"> <p><strong>Caution</strong>: When the allocation threshold is exceeded, the oldest log file in the directory is deleted to make room for new system logging messages.</p> </div> </div><p><strong>Copy Logging Messages to an External Device</strong></p><p>Individual files written to the flash disk can be transferred to external File Transfer Protocol /<span>Trivial File Transfer Protocol (</span>FTP/TFTP) server by use of the Cisco IOS庐 copy command:</p><p>Router# copy disk0:/MYDEBUG/log* <a href="ftp://user:passwd@" target="_blank" rel="noopener nofollow noreferrer">ftp://user:passwd@</a><ftp_server_ip_address>/</p><p>Router# copy disk0:/MYDEBUG/log* tftp://<tftp_server_ip_address>/</p><p>  </p><h2 id="toc-hId--1556693763">Verify</h2><p>Use this section to confirm that your configuration works properly.</p><pre>Router#show logging Syslog logging: enabled (110977 messages dropped, 17 messages rate-limited, 0 flushes, 0 overruns, xml disabled, filtering disabled) Console logging: disabled Monitor logging: disabled Buffer logging: level debugging, 31667 messages logged, xml disabled, filtering disabled Exception Logging: size (8192 bytes) Count and timestamp logging messages: disabled Persistent logging: enabled, url flash0:/MYDEBUGS, disk space 104857600 bytes, file size 5242880 bytes, batch size 4096 bytes</pre><p>  </p><pre> Router#dir flash0:MYDEBUGS<br /><br /> <span>Directory of flash0:/MYDEBUGS/<br /></span><br /><br /> <span>223  -rw-     5239168  Sep 27 2013 11:31:16 -04:00  log_20130927-112427</span><br /><span> 224  -rw-     5239631  Sep 27 2013 11:38:06 -04:00  log_20130927-113117</span><br /><span> 225  -rw-     3500757  Sep 27 2013 11:42:40 -04:00  log_20130927-113807</span></pre><h2 id="toc-hId-186116572">Troubleshoot</h2><p>There is currently no specific troubleshooting information available for this configuration.</p><p>  </p><p>The<a href="https://cway.cisco.com/cli" target="_blank" rel="nofollow noopener noreferrer">Cisco CLI Analyzer</a>(<a href="http://tools.cisco.com/RPF/register/register.do" target="_blank" rel="nofollow noopener noreferrer">registered</a>customers only) supports certainshowcommands. Use the Cisco CLI Analyzer in order to view an analysis ofshowcommand output.</p><div style="border-top: 1px solid #ccc; border-bottom: 1px solid #ccc; padding: 10px; margin-top: 20px;"><img style="margin-top: -10px;" class="custom-image-class" src="https://www.cisco.com/c/dam/en/us/td/i/templates/note.gif" border="0" alt="note-icon"/> <div style="margin-left: 38px; margin-top: -25px;"> <p><strong>Note</strong>: Refer to Important Information on Debug Commands before you use debug commands.</p> </div> </div><h2 id="toc-hId--1480763824">Related Information </h2><ul> <ul> <li><a href="https://www.cisco.com/c/en/us/support/index.html?referring_site=bodynav" target="_blank" rel="nofollow noopener noreferrer">Technical Support & Documentation - Cisco Systems</a></li> </ul> </ul></div></div><link rel="stylesheet" type="text/css" href="https://www.cisco.com/etc/designs/cdc/transformation/support-responsive.css"/> <style type="text/css"> td {border:1px solid black;} table {border:1px solid black;} </style> <cdc:do action="com.cisco.wem.framework.service.command.eotcontent.EOTResponsiveContent@2dc3fc78" returnTypedAs="eotResponsiveContainerVo" id="eotResponsiveContainerVo" /> <div class="row full visitedlinks" style="padding: 0px; margin:0px"> <div class="col full" >  <div id="eot-revision-history"> <h3>Revision History</h3> <div style="overflow-x: auto;"> <table border="1" id="erh-table"> <tbody> <tr> <th>Revision</th> <th>Publish Date</th> <th>Comments</th> </tr>  <tr class="published"> <td><div align="center">2.0</div></td> <td><div align="center">24-May-2024</div></td> <td><div align="left">Changed title to remove Cisco. 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Configure Persistent Logging on IOS Platforms - Cisco