snmpbulkwalk - retrieve a subtree of management values using SNMP GETBULK
requests
snmpbulkwalk [APPLICATION OPTIONS] [COMMON OPTIONS] AGENT [OID]
snmpbulkwalk is an SNMP application that uses SNMP GETBULK requests to
query a network entity efficiently 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 GETBULK
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,
snmpbulkwalk will search MIB-2.
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.
- -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 snmpbulkwalk to loop indefinitely. By default,
snmpbulkwalk tries to detect this behavior and warns you when it
hits an agent acting illegally. Use -Cc to turn off this
behaviour.
- -Ci
- Include the given OID in the search range. Normally
snmpbulkwalk uses GETBULK requests starting with the OID you
specified and returns all results in the MIB tree after 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.
-
-Cn<NUM>
- Set the non-repeaters field in the GETBULK PDUs.
This specifies the number of supplied variables that should not be
iterated over. The default is 0.
- -Cp
- Upon completion of the walk, print the number of variables
found.
-
-Cr<NUM>
- Set the max-repetitions field in the GETBULK PDUs.
This specifies the maximum number of iterations over the repeating
variables. The default is 10.
In addition to these options,
snmpbulkwalk takes the common options
described in the
snmpcmd(1) manual page. Note that
snmpbulkget
REQUIRES an argument specifying the agent to query and at most one OID
argument, as described above.
The command:
snmpbulkwalk -v2c -Os -c public 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
In contrast to
snmpwalk, this information will typically be gathered in a
single transaction with the agent, rather than one transaction per variable
found.
snmpbulkwalk is thus more efficient in terms of network
utilisation, which may be especially important when retrieving large tables.
As the name implies,
snmpbulkwalk utilizes the SNMP GETBULK message,
which is not available in SNMP v1.
snmpcmd(1),
variables(5).