CISCO-LINK-ERROR-MONITOR-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 2004-11-19

Category: Alarm and Event Management, Cisco Devices, Network Interfaces, Network Monitoring (RMON)

Description: Monitors per-link error rates and generates threshold-based alarms for link quality degradation.

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What Is CISCO-LINK-ERROR-MONITOR-MIB?

CISCO-LINK-ERROR-MONITOR-MIB implements Cisco's Link Error Monitoring feature, which watches per-interface link error counters and raises alarms or takes action when error rates cross configurable thresholds across consecutive sampling intervals. It exposes global configuration (enable state, sampling interval and count, configured action), a per-error-type threshold table with low/high bounds, and a per-interface counter table tracking the actual error counts. This is squarely a fault/hardware-health monitoring MIB for physical interfaces -- it lets an administrator detect degrading cabling, optics, or interface hardware before an interface fails outright, and can trigger automated remediation such as error-disabling a port. It builds conceptually on standard interface error counters similar to those in IF-MIB. It is typically deployed on Cisco switches/routers to proactively guard against flapping or failing physical links. Engineers can download the CISCO-LINK-ERROR-MONITOR-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-LINK-ERROR-MONITOR-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

Cisco switches and routers

Monitoring Examples

An admin checks clemIfCounterTable/clemIfCounterEntry per interface for current error counts, and cross-references clemThresholdTable entries (clemThresholdLow/clemThresholdHigh per clemThresholdCounterType) to see which counters and bounds trigger an alarm. With clemNotifEnable set, exceeding a threshold for clemSamplingTimes consecutive intervals of clemSamplingInterval seconds fires a notification and invokes clemAction (e.g. shutting the interface down) -- useful for catching a transceiver or cable degrading with rising error counts.

What Can Be Monitored

per-interface error counters
error threshold configuration (low/high)
sampling interval and consecutive-sample count
link error monitoring enabled state
configured error action
error notification enable state

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From IF-MIB

ifIndex

OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

TEXTUAL-CONVENTION
TruthValue

OIDs

OID symbolic	OID numeric	Type	Access	Description
ciscoLinkErrorMonitorMIB	1.3.6.1.4.1.9.9.426			The MIB module for managing Link Error Monitoring Feature on devices. Link Error Monitoring Feature provides a mechanism to monitor a certain set of link error counters on an interface and take certain actions when the increase in the error counters between two consecutive samplings exceeds the configurable thresholds consecutively for a certain number of times.
ciscoLinkErrMonMIBNotifs	1.3.6.1.4.1.9.9.426.0
NTF clemLowThresholdExceeded	1.3.6.1.4.1.9.9.426.0.1			This notification will be sent when the increase in an error counter type on an interface between two consecutive sampling exceeds the error counter's clemThresholdLow consecutively for clemSamplingTimes number of times.
NTF clemHighThresholdExceeded	1.3.6.1.4.1.9.9.426.0.2			This notification will be sent when the increase in an error counter type on an interface between two consecutive sampling exceeds the error counter's clemThresholdHigh consecutively for clemSamplingTimes number of times.
ciscoLinkErrMonMIBObjects	1.3.6.1.4.1.9.9.426.1
clemGlobalObjects	1.3.6.1.4.1.9.9.426.1.1
T/F clemEnabled	1.3.6.1.4.1.9.9.426.1.1.1	TruthValue	read-write	Specifies whether the Link Error Monitor Feature is enabled on the device or not.
U32 clemSamplingInterval	1.3.6.1.4.1.9.9.426.1.1.2	Unsigned32	read-write	Specifies the sampling interval to sample the interfaces' monitored link error counters.
U32 clemSamplingTimes	1.3.6.1.4.1.9.9.426.1.1.3	Unsigned32	read-write	Specifies the consecutive number of times with error counter increase over thresholds between two consecutive samplings before corresponding notifications can be sent and actions can be taken on an interface.
INT clemAction	1.3.6.1.4.1.9.9.426.1.1.4	INTEGER	read-write	Specifies the action to be taken on an interface when the increase in an error counter on that interface between two consecutive sampling exceeds the corresponding clemThresholdHigh for consecutive number of times as specified by clemSamplingTimes. errdisable -- the interface is disabled by forcing its link down. failover -- when the interface is a member of a channel and it is the only operational member in the channel, then no operation will be taken. Otherwise, disable the interface by forcing its link down, i.e., errdisable the interface.
clemThresholdTable	1.3.6.1.4.1.9.9.426.1.1.5		not-accessible	A table containing threshold configuration for the monitored link error counters.
clemThresholdEntry	1.3.6.1.4.1.9.9.426.1.1.5.1		not-accessible	An entry containing threshold configuration for each type of link error counter that can be monitored by this feature on the device.
NUM clemThresholdCounterType	1.3.6.1.4.1.9.9.426.1.1.5.1.1	ClemCounterType	not-accessible	Indicates the type of link error counter to be monitored.
U32 clemThresholdLow	1.3.6.1.4.1.9.9.426.1.1.5.1.2	Unsigned32	read-write	Specifies the low threshold for an error counter type. When the increase in this error counter type on an interface between two consecutive sampling exceeds the instance value of clemThresholdLow for this error counter type consecutively for clemSamplingTimes number of times, a clemLowThresholdExceeded notification on that interface will be sent.
U32 clemThresholdHigh	1.3.6.1.4.1.9.9.426.1.1.5.1.3	Unsigned32	read-write	Specifies the high threshold for an error counter type. When the increase in this error counter type on an interface between two consecutive sampling exceeds the instance value of clemThresholdHigh for this error counter type consecutively for clemSamplingTimes number of times, a clemHighThresholdExceeded notification on that interface will be sent. And, the action specified by clemAction will be taken on that interface. The instance value of this clemThresholdHigh must be greater than the instance value of the clemThresholdLow of the same row.
BIT clemNotifEnable	1.3.6.1.4.1.9.9.426.1.1.6	Bits	read-write	Indicates whether the generation of a specified notification is enabled or not. If a bit corresponding to a notification is set to 1, then that notification can be generated. lowThresholdExcd -- the clemLowThresholdExceeded notification. highThresholdExcd -- the clemHighThresholdExceeded notification.
clemInterfaceObjects	1.3.6.1.4.1.9.9.426.1.2
clemIfCounterTable	1.3.6.1.4.1.9.9.426.1.2.1		not-accessible	A table containing interface-specific link error monitoring information for each error counter type monitored by the feature.
clemIfCounterEntry	1.3.6.1.4.1.9.9.426.1.2.1.1		not-accessible	An entry containing link error monitoring information on each capable interface for each error counter type monitored by the feature.
NUM clemIfCounterType	1.3.6.1.4.1.9.9.426.1.2.1.1.1	ClemCounterType	not-accessible	Indicates the type of link error counter to be monitored on an interface.
T/F clemIfCounterEnable	1.3.6.1.4.1.9.9.426.1.2.1.1.2	TruthValue	read-write	Specifies whether the sampling on the corresponding error counter type is enabled on an interface or not.
ciscoLinkErrMonMIBConform	1.3.6.1.4.1.9.9.426.2
ciscoLinkErrMonMIBCompliances	1.3.6.1.4.1.9.9.426.2.1
ciscoLinkErrMonMIBCompliance	1.3.6.1.4.1.9.9.426.2.1.1			The compliance statement for CISCO-LINK-ERROR-MONITOR-MIB.
ciscoLinkErrMonMIBGroups	1.3.6.1.4.1.9.9.426.2.2
clemGlobalGroup	1.3.6.1.4.1.9.9.426.2.2.1			A collection of objects to configure link error monitoring functionality globally for all interfaces on the device.
clemThresholdGroup	1.3.6.1.4.1.9.9.426.2.2.2			A collection of objects to configure the threshold for the monitored error counters by this feature.
clemIfCounterGroup	1.3.6.1.4.1.9.9.426.2.2.3			A collection of objects to configure link error monitoring functionality at interface level on each error counter type.
clemNotificationGroup	1.3.6.1.4.1.9.9.426.2.2.4			A collection of notifications for link error monitoring feature.
clemNotificationControlGroup	1.3.6.1.4.1.9.9.426.2.2.5			A collection of objects to control the notification generation for link error monitoring feature.

RFC description

Vendor-private MIB for Cisco link error monitoring, providing objects to detect and report bit-error-rate thresholds, frame errors, and CRC violations on interfaces.

Start monitoring Cisco switches and routers (link error monitoring) 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 CISCO-LINK-ERROR-MONITOR-MIB

What Is CISCO-LINK-ERROR-MONITOR-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description