snmpwalk(1)
NAME
snmpwalk - retrieve a subtree of management values using SNMP GETNEXT requests
SYNOPSIS
snmpwalk [APPLICATION OPTIONS] [COMMON OPTIONS] AGENT [OID]
DESCRIPTION
snmpwalk is an SNMP application that uses SNMP GETNEXT requests to query a network entity for a tree of information. An object identifier (OID) may be given on the command line. This OID specifies which portion of the object identifier space will be searched using GETNEXT requests. All variables in the subtree below the given OID are queried and their values presented to the user. Each variable name is given in the format specified in variables(5). If no OID argument is present, snmpwalk will search the subtree rooted at SNMPv2-SMI::mib-2 (including any MIB object values from other MIB modules, that are defined as lying within this subtree). If the network entity has an error processing the request packet, an error packet will be returned and a message will be shown, helping to pinpoint why the request was malformed. If the tree search causes attempts to search beyond the end of the MIB, the message "End of MIB" will be displayed.
OPTIONS
-Cc Do not check whether the returned OIDs are increasing. Some
agents (LaserJets are an example) return OIDs out of order, but
can complete the walk anyway. Other agents return OIDs that
are out of order and can cause snmpwalk to loop indefinitely.
By default, snmpwalk tries to detect this behavior and warns
you when it hits an agent acting illegally. Use -Cc to turn
off this check.
-CE {OID}
End the walk at the specified OID, rather than a simple
subtree. This can be used to walk a partial subtree, selected
columns of a table, or even two or more tables within a single
command.
-Ci Include the given OID in the search range. Normally snmpwalk
uses GETNEXT requests starting with the OID you specified and
returns all results in the MIB subtree rooted at that OID.
Sometimes, you may wish to include the OID specified on the
command line in the printed results if it is a valid OID in the
tree itself. This option lets you do this explicitly.
-CI In fact, the given OID will be retrieved automatically if the
main subtree walk returns no useable values. This allows a
walk of a single instance to behave as generally expected, and
return the specified instance value. This option turns off
this final GET request, so a walk of a single instance will
return nothing.
-Cp Upon completion of the walk, print the number of variables
found.
-Ct Upon completion of the walk, print the total wall-clock time it
took to collect the data (in seconds). Note that the timer is
started just before the beginning of the data request series
and stopped just after it finishes. Most importantly, this
means that it does not include snmp library initialization,
shutdown, argument processing, and any other overhead.
In addition to these options, snmpwalk takes the common options
described in the snmpcmd(1) manual page.
EXAMPLES
Note that snmpwalk REQUIRES an argument specifying the agent to query and at most one OID argument, as described there. The command: snmpwalk -Os -c public -v 1 zeus system will retrieve all of the variables under system: sysDescr.0 = STRING: "SunOS zeus.net.cmu.edu 4.1.3_U1 1 sun4m" sysObjectID.0 = OID: enterprises.hp.nm.hpsystem.10.1.1 sysUpTime.0 = Timeticks: (155274552) 17 days, 23:19:05 sysContact.0 = STRING: "" sysName.0 = STRING: "zeus.net.cmu.edu" sysLocation.0 = STRING: "" sysServices.0 = INTEGER: 72 (plus the contents of the sysORTable). The command: snmpwalk -Os -c public -v 1 -CE sysORTable zeus system will retrieve the scalar values, but omit the sysORTable.
SEE ALSO
snmpcmd(1), snmpbulkwalk(1), variables(5).
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