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Fetch all the SNMP objects from an agent
(PHP 4, PHP 5)
snmpwalk() function is used to read all the values from an SNMP agent specified by the hostname. Parameters
Return Values
Returns an array of SNMP object values starting from the
object_id as root or ExamplesExample 2267. snmpwalk() Example<?phpAbove function call would return all the SNMP objects from the SNMP agent running on localhost. One can step through the values with a loop
See Also
Code Examples / Notes » snmpwalksteve
Timeout is in MICRO seconds. 1,000,000 µs = 1 s layer2
Something to care about in dealing with snmpwalk: While walking the MIB, snmpwalk puts info that gets into an array, and that is correct. The trouble happened when snmpwalk needs to collect information from instances that contains subinstances (i.e. walking .1.2.3.4.5 and having instances like 1.1, 1.2, 1.3): in this case it gets info and passes into an array, but when walking the array, each value is preceeded by 'Counter32: '. I've tested this in many ways and it always happened the same way. lars troen
Note that there's different behaviuor in php snmpwalk and ucd snmpwalk. If you try to walk an oid that has one value not under a subkey of the walked oid, ucd snmpwalk will return the value while php's snmpwalk will not.
anders
It would be nice to be able to specify what snmp version to use ( 1,2c,3 ) For now, I'ts hardcoded in ext/snmp/snmp.c change session.version from 1 to 2c or 3 if you need for now.. i.e session.version = SNMP_VERSION_1; to: session.version = SNMP_VERSION_2c; bobby dot clark
I had to use an object_id like these. 'SNMPv2-MIB::system.sysDescr.0' 'IF-MIB::interfaces.ifTable.ifEntry.ifAdminStatus' <?php $host = '192.168.1.1'; $community = 'public'; $object_id = 'IF-MIB::interfaces.ifTables.ifEntry.ifAdminStatus'; $sysdesc = snmpwalk($host, $community', $object_id); print_r($sysdesc); ?> http://mike.eire.ca
I found on Windows (PHP 5) an empty string did not return anything, it just timed out. I had to use null instead: <?php $a = snmpwalk("127.0.0.1", "public", null); ?> billf
for the poster wondering what the timeout field was measured in: from the ucd-snmp header file snmp_api.h: long timeout; /* Number of uS until first timeout then exponential backoff */ john
Ah. That's why all of our SNMP stuff was timing out anytime there was any load on the system. Sigh. A waste of two weeks trying to debug snmp.... Even the snmpcmd manpage doesn't give a unit for timeout. jmartinson at_nospam info234.com
A quick router device view: <? include "header.html"; $host = "auscr1"; $community = "tellme"; $sysDescr = snmpget("$host","$community","system.sysDescr.0"); $ifDescr = snmpwalk("$host","$community","interfaces.ifTable.ifEntry.ifDescr"); $ifIndex = snmpwalk("$host","$community","interfaces.ifTable.ifEntry.ifIndex"); $ifAdminStatus = snmpwalk("$host","$community","interfaces.ifTable.ifEntry.ifAdminStatus"); $ifOperStatus = snmpwalk("$host","$community","interfaces.ifTable.ifEntry.ifOperStatus"); $ifLastChange = snmpwalk("$host","$community","interfaces.ifTable.ifEntry.ifLastChange"); print "<table border=1 bgcolor=#ffffff><tr><td>$host</td></tr></table> "; print "<table border=1 bgcolor=#ffffff><tr><td>$sysDescr</td></tr></table> "; print "<table border=1 bgcolor=#ffffff>"; print "<tr> <td>ifIndex</td> <td>ifDescr</td> <td>ifAdminStatus</td> <td>ifOperStatus</td> <td>ifLastChange</td> </tr>"; for ($i=0; $i<count($ifIndex); $i++) { print "<tr>"; print "<td>$ifIndex[$i]</td>"; print "<td>$ifDescr[$i]</td>"; print "<td>$ifAdminStatus[$i]</td>"; print "<td>$ifOperStatus[$i]</td>"; print "<td>$ifLastChange[$i]</td>"; print "</tr>"; } print "</table>"; ?> |
