HP-OV-NETMON

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Description: HP-OV-NETMON module

Start monitoring vendor-neutral, standards-based MIB, any SNMPv3-capable network device (SNMP engine identity/boot/clock status) 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.

What Is HP-OV-NETMON?

HP-OV-NETMON is an early HP-proprietary MIB (registered under the HP OpenView enterprise branch) that exposes internal status of the netmon process, the background poller within HP OpenView Network Node Manager responsible for ICMP and SNMP status polling of managed nodes and interfaces. Its nmICMPStatus and nmSNMPStatus groups report nmICMPListLength/nmSNMPListLength (how many interfaces or nodes are actively queued for polling), nmICMPPollsWithin1m/nmSNMPPollsWithin1m (near-term polling load), and nmICMPSecsUntilNextPoll/nmSNMPSecsUntilNextPoll (how far behind or ahead schedule the poller is, which can go negative if netmon is falling behind). A separate nmStatPollTable, indexed by topoObjID (the OpenView topology database ID for an interface), lets a test engineer override objStatus with a manual value instead of letting netmon measure it via ping, controlled by the takeEffectWhen timing object and the informational criticalRoute and numCritRouteObjs fields describing the network path to a node. This MIB is unusual in that it monitors the health of the monitoring system itself rather than of managed network elements, making it useful for diagnosing whether NNM's own polling engine is keeping up with its workload. It has no dependency beyond the base RFC-1212 OBJECT-TYPE macro, reflecting its age. It is deployed on HP OpenView Network Node Manager distribution stations, and administrators can download the HP-OV-NETMON file to load it into their MIB browser when troubleshooting delayed status updates in NNM.

IPNetwork Monitor allows you to monitor SNMP objects defined in HP-OV-NETMON. 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

HP OpenView Network Node Manager distribution/collection stations

Monitoring Examples

An operator polls nmICMPSecsUntilNextPoll and nmICMPListLength to see whether netmon's ICMP polling queue is backing up; a persistently negative nmICMPSecsUntilNextPoll value combined with a growing nmICMPListLength would indicate the polling engine cannot keep pace and status updates across the managed network are becoming stale.

What Can Be Monitored

ICMP polling queue length and near-term poll count
seconds until next scheduled ICMP/SNMP poll (poller backlog)
SNMP polling queue length and near-term poll count
manually-overridden interface status test table
critical route path to a node

Imported Objects

From RFC-1212

OBJECT-TYPE

From SNMPv2-SMI

enterprises

OIDs

OID symbolic	OID numeric	Type	Access	Description
hp	1.3.6.1.4.1.11
nm	1.3.6.1.4.1.11.2
openView	1.3.6.1.4.1.11.2.17
hpOVDistribStation	1.3.6.1.4.1.11.2.17.4
hpOVNetmon	1.3.6.1.4.1.11.2.17.4.4
nmStatus	1.3.6.1.4.1.11.2.17.4.4.1
nmICMPStatus	1.3.6.1.4.1.11.2.17.4.4.1.1
INT nmICMPListLength	1.3.6.1.4.1.11.2.17.4.4.1.1.1	INTEGER	read-only	The length of netmon's ICMP polling list, indicating the number of managed interfaces actively being status polled.
INT nmICMPPollsWithin1m	1.3.6.1.4.1.11.2.17.4.4.1.1.2	INTEGER	read-only	The number of interfaces scheduled to be polled by netmon via ICMP with the next minute.
INT nmICMPSecsUntilNextPoll	1.3.6.1.4.1.11.2.17.4.4.1.1.3	INTEGER	read-only	The number of seconds until the next scheduled ICMP poll. This may a negative number if netmon is behind in ICMP polling.
nmSNMPStatus	1.3.6.1.4.1.11.2.17.4.4.1.2
INT nmSNMPListLength	1.3.6.1.4.1.11.2.17.4.4.1.2.1	INTEGER	read-only	The length of netmon's SNMP polling list, indicating the number of managed nodes actively being polled.
INT nmSNMPPollsWithin1m	1.3.6.1.4.1.11.2.17.4.4.1.2.2	INTEGER	read-only	The number of nodes scheduled to be polled by netmon via SNMP with the next minute.
INT nmSNMPSecsUntilNextPoll	1.3.6.1.4.1.11.2.17.4.4.1.2.3	INTEGER	read-only	The number of seconds netmon until the next scheduled SNMP poll. It is calculated by subtracting the time of the poll at the head of the list from the current time. If netmon is behind, this can be a negative value.
nmTest	1.3.6.1.4.1.11.2.17.4.4.2
nmStatPollTable	1.3.6.1.4.1.11.2.17.4.4.2.1		not-accessible	A list of nmStatPollEntry's which contain user specified status values for node interfaces. There is no scalar MIB that represents the number of entries.
nmStatPollEntry	1.3.6.1.4.1.11.2.17.4.4.2.1.1		not-accessible	The MIB objects in this entry contain the user specified value of the status poll for the particular interface and various support MIB variables which control when the new status takes affect and how many nodes will be changed by the action.
INT topoObjID	1.3.6.1.4.1.11.2.17.4.4.2.1.1.1	INTEGER	read-only	The OpenView Network Node Manager ovwDB ID which corresponds to a particular internet interface object in the topology database. This object can correspond to an ip, ipx, level 2 interface. However, at first deployment only ip interfaces are supported.
INT objStatus	1.3.6.1.4.1.11.2.17.4.4.2.1.1.2	INTEGER	read-write	The value of this MIB object is the value that netmon will use as the status of the object whenever the particular object comes to the top of the status polling queue. If the value is different than what is currently in the OpenView Network Node Manager topology database, then netmon will process the change just like it does if the result came back from ping (e.g. netmon may change the status in the topoDB and send out various events). A value of D_ifStatus_measureIt(0) indicates that netmon should measure the status of the object (like it normally does in the product) using ping or other techniques rather than using a value provided by a user. During a set operation, the user supplied value will be written immediately to an interface specific record in netmon. The value will ripple through to the event system and topology database immediately if the MIB variable has a value of immediately(1) or at netmon's next status poll if has a value of atNextStatusPoll(0). This object is intended to be used to provide a value for interfaces only. For example, setting a value for a node will fail. The instance value for this object is the ovwDB ID (topoObjID) which corresponds to an interface in the topology DB. The ovwDB ID is used instead of ipAddress because it works for level 2, ip, ipx and in general any kind of object in the topology database. REFINEMENT/CORRECTION: Instead of actually specifying a value that netmon must use for the node, we want to communicate which nodes are inaccessible and allow netmon to determine the exact status using it's router down analysis and configuration. So the status values above will be mapped per the following table: ifStatusMeasureIt(0) Maps to 'Measure status with ping just like normal operation'. ifStatusNormal(2) Maps to 'Up'. ifStatusUnknown(1), ifStatusMinor(3), ifStatusCritical(4), ifStatusUnmanaged(5), ifStatusWarning(6), ifStatusMajor(7), ifStatusRestricted(8), ifStatusTesting(9), ifStatusDisabled(10) All others values map to inaccessible. The actual status value used will be determined by netmon using its Router Down algorithm and configuration.
INT takeEffectWhen	1.3.6.1.4.1.11.2.17.4.4.2.1.1.3	INTEGER	read-write	This MIB object specifies when the user specified interface status will impact the Event System and the Topology database. A value of atNextStatusPoll(0) indicates that the value will be recorded in netmon's process memory but will not impact the Event System and Topology database until netmon is ready to perform the next status poll on the specified interface. A value of immediately(1) causes netmon to move the specified node to the front of the status poll queue so that the new status impacts the Event System and Topology database immediately. A set with a value greater than immediately(1) is interpretted as a time to schedule a status poll for the selected interface. The interface is rescheduled at a time equal to now + in seconds. This is useful for automated tests for eliminating the possibility that netmon will status poll nodes that the test is working on before the test is set up or in a different order then the test expects. The structure of this MIB table suggests that the value is stored in netmon on a per interface basis. This could happen at a later date but is initially implemented as a interface-independent global. For reliable operation, this MIB variable should be specified as a var-bind preceding objStatus in a multi-var-bind SNMP Set request.
INT numCritRouteObjs	1.3.6.1.4.1.11.2.17.4.4.2.1.1.4	INTEGER	read-write	This object is currently not implemented.
STR criticalRoute	1.3.6.1.4.1.11.2.17.4.4.2.1.1.5	DisplayString	read-write	This MIB object's value is a space separated list of . tuple values which correspond to the specified interface's criticalRoute beginning with the netmon host/interface and ending with the specified host/interface. This value is normally computed by netmon during the status poll of the specified interface. For automated test situations, you can imagine starting up the system from scratch (including netmon). At the time the test runs, it's possible that netmon has not yet calculated criticalRoute for the nodes of interest. Of course if you wait long enough, netmon will eventually get around to computing a criticalRoute value. To facilitate automated testing, a set to this object forces netmon to compute the criticalRoute attribute for the specified interface. The user supplied value is ignored.

RFC description

HP OpenView Netmon MIB for managing network monitoring status including ICMP polling lists and SNMP status on distributed stations.

Start monitoring HP OpenView Network Node Manager distribution/collection station 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 HP-OV-NETMON

What Is HP-OV-NETMON?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description