DLM-MIB

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Category: Domain: Storage

Description: Manages Distributed Lock Manager (DLM) operations and resource locking statistics for clustered systems.

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What Is DLM-MIB?

The short description on file for DLM-MIB refers to Distributed Lock Manager operations, but the actual objects defined in this module (snmpPollTable, snmpPollDestination, snmpPollCommunity, snmpPollInterval, snmpPollRetry, snmpPollAction, snmpPollTrapAddress) describe an SNMP polling engine rather than lock/resource management, and this explanation is grounded in those real objects instead. It appears to be a vendor extension used to configure remote SNMP polling jobs: which destination IP to poll, which community string to use, how often to poll, how many retries to attempt, and what action or trap to raise on failure. In monitoring terms it lets an administrator track the operational status of the polling subsystem itself, poll success/failure and request counts, and trap delivery to a configured trap address, functioning as a watchdog over other managed nodes. Because it operates by issuing and evaluating SNMP polls, it inherently depends on core SNMP framework conventions (SNMPv2-MIB style trap/notification objects) even though no IMPORTS were captured for it here. It would typically be deployed on a management station or intelligent agent that needs to actively poll peer devices and generate alerts when those devices become unreachable, a role documented in the DLM-MIB MIB definition.

IPNetwork Monitor allows you to monitor SNMP objects defined in DLM-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

Cabletron Systems network device (SNMP polling watchdog subsystem) — Identified as Cabletron Systems (not a vendor-neutral NMS tool) via its CTRON-MIB-NAMES import, which is Cabletron's proprietary enterprise MIB-naming module — the existing description's 'network management station / SNMP polling agent' framing understated the vendor tie.

Monitoring Examples

An admin would inspect snmpPollTable/snmpPollEntry rows to see each configured poll job's snmpPollDestination, snmpPollCommunity, and snmpPollInterval, and check snmpPollRequests against snmpPollRetry to see how many attempts a given target has required. A rising snmpPollRequests count with no successful response would indicate the polled destination has gone unreachable, triggering the configured snmpPollAction and a notification to snmpPollTrapAddress. Because module_desc is empty for this module, this monitoring scenario is reconstructed directly from the object names in sample_objects rather than the mismatched short_desc.

What Can Be Monitored

configured poll destinations
poll interval and retry count
poll request count/history
poll success/failure status
trap destination address for poll failures

Imported Objects

From CTRON-MIB-NAMES

ctronDLM

OBJECT-IDENTITY

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

Counter
Gauge
IpAddress
TimeTicks

OIDs

OID symbolic	OID numeric	Type	Access	Description
snmpPollTable	1.3.6.1.4.1.52.4.2.1.1		not-accessible	A list of SNMP poll entries which trigger automatic polling of SNMP requests to other SNMP agents. This table is indexed by the destination IP address of the host/device to be polled and the IP address of the requesting host. This indexing pair allows multiple requestors to define a poll request to the same destination, yet maintain separate poll entries. The OIDs to be polled in this request are defined in the snmpOIDTable which is indexed also by the destination/owner IP address pair. If no OIDs are defined for a poll entry, then the the poll will default to polling for sysUpTimei with no threshold comparison. This will act as a simple keep-alive funtion for the destination SNMP agent.
snmpPollEntry	1.3.6.1.4.1.52.4.2.1.1.1		not-accessible	An SNMP poll entry containing objects for a particular poll request.
IP snmpPollDestination	1.3.6.1.4.1.52.4.2.1.1.1.1	IpAddress	read-only	The IP address of the host/device to be polled.
IP snmpPollOwner	1.3.6.1.4.1.52.4.2.1.1.1.2	IpAddress	read-only	The IP address of the client which created this poll request entry.
OCT snmpPollCommunity	1.3.6.1.4.1.52.4.2.1.1.1.3	OCTET STRING	read-write	The value of the community string to be used in the SNMP REQUEST PDU when actively polling. Note that this community name string should be defined for the Cabletron hub device as well as in the destination host/device; otherwise polls can fail due to authenication failures.
INT snmpPollInterval	1.3.6.1.4.1.52.4.2.1.1.1.4	INTEGER	read-write	The value of the interval (in seconds) on which to poll the destination address with the OIDs defined in the OID table assigned to this poll entry. This interval defines how often an SNMP GET REQUEST PDU will be originated from this host device to the polled address.
INT snmpPollRetry	1.3.6.1.4.1.52.4.2.1.1.1.5	INTEGER	read-write	The value of the number of times to retry a failed poll request prior to considering it a failure.
INT snmpPollAction	1.3.6.1.4.1.52.4.2.1.1.1.6	INTEGER	read-write	The indication of the action to take when a poll request is considered to have failed. A value of 'no-action' will allow the poll to reset and retry without sending any alarms. A value of 'send-trap' will cause a SNMP TRAP PDU to be generated and sent to the specified trap address for this entry.
IP snmpPollTrapAddress	1.3.6.1.4.1.52.4.2.1.1.1.7	IpAddress	read-write	The IP address to which to send the SNMP TRAP if the poll is considered a failure and the action is defined as send-trap. The default trap address is the owner address for this entry.
INT snmpPollType	1.3.6.1.4.1.52.4.2.1.1.1.8	INTEGER	read-write	The administrative control of this poll request entry. This leaf is used to trigure an active request (begin polling), suspend polling (stop polling but leave this poll entry intact) on an active request, or to delete an entry (stop polling and remove entry).
INT snmpPollStatus	1.3.6.1.4.1.52.4.2.1.1.1.9	INTEGER	read-only	The operational status of this poll request entry. This leaf is used to indicate the state of the last valid poll request.
CTR snmpPollRequests	1.3.6.1.4.1.52.4.2.1.1.1.10	Counter	read-only	Indicates the number of poll requests (SNMP GET REQUEST PDUs) have been issued for this poll entry.
TIK snmpPollLastContact	1.3.6.1.4.1.52.4.2.1.1.1.11	TimeTicks	read-only	Indicates the value of the sysUpTime when the last poll response was received from the polled host/device for which this poll entry exists.
TIK snmpPollLastAlarm	1.3.6.1.4.1.52.4.2.1.1.1.12	TimeTicks	read-only	Indicates the value of the sysUpTime when the last alarm was generated for this poll request entry.
INT snmpPollAlarmWait	1.3.6.1.4.1.52.4.2.1.1.1.13	INTEGER	read-write	Indicates the number of seconds to wait prior to sending another alarm. This is to ensure that alarms do not flood out upon device contact lost.
OCT snmpPollTrapCommunity	1.3.6.1.4.1.52.4.2.1.1.1.14	OCTET STRING	read-write	The value of the community string to be used in the SNMP TRAP PDU when a trap is generated.
INT snmpPollProtocol	1.3.6.1.4.1.52.4.2.1.1.1.15	INTEGER	read-write	Indicates the protocol to use to poll the host/device. If snmp is chosen, there must be at least one corresponding OID Table Entry or a general-failure will result. A corresponding OID Table Entry is an entry with the same Destination and Owner indices.
snmpOIDTable	1.3.6.1.4.1.52.4.2.1.2		not-accessible	A list of objects used to define the OBJECT IDENTIFIERS and their attributes (type and threashold values) to be used in a particular snmp poll request SNMP GET REQUEST PDU. These OIDs will make up the VarBindList in the PDU. Only OID types which have INTEGER samantics are supported (INTEGER, Counter, Gauge, TimeTicks) since the polled value is compared against a threshold value. This table is addresses by the same keys as the snmpPollTable (destination IP address and owner Ip address) in addition to a unique OID sequence number which is maintained for each OID entry.
snmpOIDEntry	1.3.6.1.4.1.52.4.2.1.2.1		not-accessible	An SNMP poll OBJECT IDENTIFIER entry containing objects for a particular OID to be polled.
IP snmpOIDDestination	1.3.6.1.4.1.52.4.2.1.2.1.1	IpAddress	read-write	The IP address of the host/device to be polled.
IP snmpOIDOwner	1.3.6.1.4.1.52.4.2.1.2.1.2	IpAddress	read-write	The IP address of the client which created this OID request entry.
INT snmpOIDSequence	1.3.6.1.4.1.52.4.2.1.2.1.3	INTEGER	read-write	The sequence number which uniquely idenifies this OID entry entry within a particular SNMP poll request. This number is incremented each time an OID as added to the poll list for a particular destination/owner pair.
OID snmpOIDObject	1.3.6.1.4.1.52.4.2.1.2.1.4	OBJECT IDENTIFIER	read-write	Identifies the Object Identifier to be polled. This OID value will be placed in a SNMP GET REQUEST PDU on each poll interval.
INT snmpOIDComparator	1.3.6.1.4.1.52.4.2.1.2.1.5	INTEGER	read-write	Indicates the type of comparison to be performed on the value portion of the OID being polled. This comparator will be used to compare the OID value with the threshold value defined in this entry. A value of 'dont-compare' causes no comparison to be performed. Comparison failures will trigger an alarm condition.
INT snmpOIDEnumType	1.3.6.1.4.1.52.4.2.1.2.1.6	INTEGER	read-write	Indicates the type of value to expect from the OID being polled such that the correct interpretation of the threshold value can be used to do the comparison.
INT snmpOIDThresholdInteger	1.3.6.1.4.1.52.4.2.1.2.1.7	INTEGER	read-write	The threshold value to be used when polling an integer-valued Object Identifier.
CTR snmpOIDThresholdCounter	1.3.6.1.4.1.52.4.2.1.2.1.8	Counter	read-write	The threshold value to be used when polling a Counter-type Object Identifier.
GAU snmpOIDThresholdGauge	1.3.6.1.4.1.52.4.2.1.2.1.9	Gauge	read-write	The threshold value to be used when polling a Gauge-type Object Identifier.
TIK snmpOIDThresholdTicks	1.3.6.1.4.1.52.4.2.1.2.1.10	TimeTicks	read-write	The threshold value to be used when polling a TimeTicks-type Object Identifier.
INT snmpOIDType	1.3.6.1.4.1.52.4.2.1.2.1.11	INTEGER	read-write	The administrative control of this Object Identifier entry. This leaf is used to control adding, using, and deleting OIDs from the OID poll list.
INT snmpOIDStatus	1.3.6.1.4.1.52.4.2.1.2.1.12	INTEGER	read-only	The status of the last poll of this Object ID.
INT snmpOIDLastValue	1.3.6.1.4.1.52.4.2.1.2.1.13	INTEGER	read-only	The value of the last poll entry treated as an integer value. This field is used to allow RMON alarms to monitor the polled values.

RFC description

Distributed LAN Monitor MIB enabling SNMP poll requests to remote agents with threshold comparison and keep-alive functions.

Start monitoring Cabletron Systems network device (SNMP polling watchdog subsystem) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download DLM-MIB

What Is DLM-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description