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    <h2>Printers</h2> <p>You should use the <a href="http://tools.ietf.org/html/rfc3805" rel="nofollow">Printer MIBv2</a> to monitior printer error status for jams...</p> <ul> <li><code>hrPrinterDetectedErrorState</code> reports printer errors such as low toner, jams, etc... the RFC contains details on what specific codes mean</li> <li><code>hrDeviceStatus</code> will reveal the big picture ability of the printer to handle tasks. For more info, see <a href="http://tools.ietf.org/html/rfc3805#section-2.2.13.2" rel="nofollow">Printer MIBv2, Section 2.2.13.2</a></li> </ul> <p><code>sysUpTime.0</code> is an OID that reports the time a system's SNMP stack has been up (reference <a href="http://tools.ietf.org/html/rfc1213" rel="nofollow">RFC 1213: MIB-II</a>). If this value is returned and incrementing, it's a 99% safe bet that a printer is up. Most people use <code>sysUpTime</code> to detect whether the device has rebooted for some reason; if that happens, you'll see a sudden decrease in <code>sysUpTime.0</code>, unless your last value was around 248 days (where a 32-bit counter would roll).</p> <h2>Ethernet Switches</h2> <p>Checking the basic health of ethernet switches is usually done with checks to <code>sysDescr.0</code> or <code>sysUpTime.0</code>; the problem with this heuristic comes if you care about the up/down status of particular links... at that point, you need to check values from <code>ifOperStatus</code>, which is indexed by <code>ifIndex</code> and uses interface names from <code>ifName</code>. See the following examples...</p> <pre><code>[mpenning@Hotcoffee ~]$ ## Walk ifName correlated to ifIndex [mpenning@Hotcoffee ~]$ snmpwalk -v 2c -c Public 172.25.116.6 .1.3.6.1.2.1.31.1.1.1.1 iso.3.6.1.2.1.31.1.1.1.1.1 = STRING: "Fa0/0" iso.3.6.1.2.1.31.1.1.1.1.2 = STRING: "Nu0" [mpenning@Hotcoffee ~]$ ## Walk ifOperStatus (up==1) [mpenning@Hotcoffee ~]$ snmpwalk -v 2c -c Public 172.25.116.6 .1.3.6.1.2.1.2.2.1.8 iso.3.6.1.2.1.2.2.1.8.1 = INTEGER: 1 iso.3.6.1.2.1.2.2.1.8.2 = INTEGER: 1 [mpenning@Hotcoffee ~]$ </code></pre> <p>Thus we know from the example that both interface "Fa0/0" (index: 1) and "Nu0" (index: 2) have an ifOperStatus of "up"; the index value is the last integer returned in the OID of the results.</p> <h2>Scripting</h2> <p>I assume you will use <code>bash</code> for your monitoring scripts; if so, check out <a href="http://www.net-snmp.org/" rel="nofollow">Net-SNMP</a> for your SNMP manager</p>
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    1. POWhat snmp OID should I watch to see if my printers and switches is up an running
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    1. USMike Pennington
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    1. POWhat snmp OID should I watch to see if my printers and switches is up an running
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    1. COI want to create a http status page, that uses php to call a perl script, that uses bash commands. the perl script reads ip's from a file, and will send a few snmpget commands to test, if the device is running. Does all that sound ok to you? -or is there a better way to do it?
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      1. UShpekristiansen
    2. COThere are a lot of things that depend on the detailed requirements... if this is an internal corporate app, what you described sounds fine; however, you probably can do everything directly in PHP, if that's what you're most fluent in. You should be able to make `snmpget` or `snmpwalk` calls directly from either PHP or Perl. I encourage people to use the language they're most fluent in, unless it just can't do what you need
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