CISCO-SEU-MITIGATION-MIB

All MIBs › CISCO-SEU-MITIGATION-MIB

Organization: Cisco Systems, Inc.

Last Updated: 2009-06-24

Category: Cisco Devices, Device Management, Hardware and Environment

Description: Monitors Single Event Upset (SEU) hardware error detection and mitigation due to cosmic ray radiation on Cisco platforms.

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What Is CISCO-SEU-MITIGATION-MIB?

CISCO-SEU-MITIGATION-MIB is a Cisco proprietary module that reports on Single Event Upset (SEU) detection and mitigation, a hardware reliability feature protecting Cisco IOS equipment deployed in high-radiation environments such as geosynchronous satellites from cosmic-ray-induced bit errors in memory, caches, and registers. Its data covers memory-scrubbing configuration and status per physical entity, including whether rate-adaptive or algorithmic scrubbing is enabled, scrub run intervals and units, and retry/delta interval parameters. This module is explicitly a hardware health monitoring tool, letting operators confirm that memory-scrubbing mitigation is actively running and correctly tuned on radiation-exposed hardware, which is critical for catching silent memory corruption before it causes a device or software fault. It ties into the standard ENTITY-MIB via csmScrubEntPhysicalIndex to associate scrub status with a specific physical entity in the device's inventory. It is deployed on Cisco IOS routers hardened for and operating in radiation-tolerant satellite communication payloads, where the CISCO-SEU-MITIGATION-MIB MIB is the SNMP interface administrators poll to confirm scrub status remotely.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-SEU-MITIGATION-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 IOS routers hardened for satellite payloads (e.g. Cisco IRIS/18400 Space Router)

Monitoring Examples

An administrator polls csmScrubTable/csmScrubEntry keyed by csmScrubIndex and csmScrubEntPhysicalIndex to confirm csmScrubAlgorithmEnabled is true and csmScrubRateAdaptive reflects the intended scrubbing mode for a given memory component. Reviewing csmScrubRunInterval and csmScrubRunIntervalUnits against csmScrubRetryInterval helps verify the scrub cadence matches the radiation environment's risk profile, and an unexpectedly disabled csmScrubScrubName entry would indicate a memory region no longer protected against cosmic-ray-induced bit errors.

What Can Be Monitored

memory scrub algorithm enabled state
rate-adaptive scrubbing mode
scrub run interval
retry/delta interval settings
per-physical-entity scrub status

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From CISCO-TC

EntPhysicalIndexOrZero

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

Counter32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

DateAndTime
DisplayString
TruthValue

How to Use in IPNetwork Monitor

Example using csmScrubErrorsSingleBit OID:

Select a Cisco IOS router (satellite-hardened) as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type csmScrubErrorsSingleBit into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. This object counts the single-bit errors for the specific error type described by csmScrubErrorsDescription. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases between polls, since a rising count of errors, failures, or discards often points to a real underlying problem. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
ciscoSeuMitigationMIB	1.3.6.1.4.1.9.9.701			This MIB reports the status of non-automatic and automatic, rate-adaptive Single Event Upset (SEU) mitigation algorithms and adjusts their parameters, as well as reports the effects of those mitigations on memories, caches, and registers. SEU mitigation allows Cisco IOS to run on radiation tolerant hardware deployed in a geosynchronous Earth orbit satellites for IP communications. One of the challenges in deploying equipment in such an environment is the impact that radiation has on digital circuits. A Single Event Upset (SEU) occurs when the hardware is exposed to energetic ions and protons in the space environment. The value stored in a bit of information can change when a large enough charge is deposited on the digital circuit. This leads to adverse effects in the operation of the software; in this case Cisco IOS. While steps have been taken to reduce the occurrence of SEUs through the use of radiation tolerant hardware, these steps do not eliminate the threat. A critical requirement in running IOS on such platforms is the utilization of SEU mitigation strategies to reduce the impact of such events on the operation of the Cisco device. GLOSSARY SEU : Acronym for 'Single Event Upset' : A hardware disruption caused when hardware is exposed to energetic ions and protons. scrub : An algorithm that periodically refreshes memory, cache or register contents by various means.
ciscoSeuMitigationMIBNotifs	1.3.6.1.4.1.9.9.701.0
NTF csmSeuScrubAlert	1.3.6.1.4.1.9.9.701.0.1			Notifies NMS when the scrub rate or SEU-mitigation rate is elevated, decreased or returns to normal.
ciscoSeuMitigationMIBObjects	1.3.6.1.4.1.9.9.701.1
csmScrubTable	1.3.6.1.4.1.9.9.701.1.1		not-accessible	This table provides the configuration settings for the scrub algorithms. All entries are added with the SEU subsystem is initialized.
csmScrubEntry	1.3.6.1.4.1.9.9.701.1.1.1		not-accessible	This object represents an entry in the csmScrubConfigTable.
U32 csmScrubIndex	1.3.6.1.4.1.9.9.701.1.1.1.1	Unsigned32	not-accessible	This object uniquely identifies the csmScrubEntry.
ENT csmScrubEntPhysicalIndex	1.3.6.1.4.1.9.9.701.1.1.1.2	EntPhysicalIndexOrZero	read-only	This object represents the EntityPhysicalIndex (from the ENTITY-MIB) corresponding to the physical entity upon which the scrub or SEU-mitigation is being performed.
STR csmScrubScrubName	1.3.6.1.4.1.9.9.701.1.1.1.3	DisplayString	read-only	This object represents the name of the particular scrub or SEU algorithm, such as Memory Scrub, Register Scrub, etc.
T/F csmScrubRateAdaptive	1.3.6.1.4.1.9.9.701.1.1.1.4	TruthValue	read-only	This object indicates whether the scrub or SEU algorithm is rate-adaptive. The values provided by objects csmScrubDeltaInterval, csmScrubRetryInterval, and csmScrubThresholdInterval are only applicable when this object is set to 'true'. true : Algorithm is rate-adaptive. false : Algorithm is NOT rate-adaptive.
T/F csmScrubAlgorithmEnabled	1.3.6.1.4.1.9.9.701.1.1.1.5	TruthValue	read-write	This object indicates whether the SEU algorithm is enabled. true : Algorithm is enabled false : Algorithm is disabled
U32 csmScrubRunInterval	1.3.6.1.4.1.9.9.701.1.1.1.6	Unsigned32	read-write	This object represents the amount of wait time between when a scrub algorithm finishes its current run and begins its next run.
STR csmScrubRunIntervalUnits	1.3.6.1.4.1.9.9.701.1.1.1.7	DisplayString	read-only	This object represents the units for csmScrubRunInterval.
U32 csmScrubDeltaInterval	1.3.6.1.4.1.9.9.701.1.1.1.8	Unsigned32	read-write	This object represents the amount of time that a rate-adaptive scrub algorithm increases or decreases the csmScrubRunInterval. The scrub interval is decreased when an error interrupt occurs and the cScrubThresholdIntervalCount is exceeded. The scrub interval is increased when the scrub retry timer expires.
STR csmScrubDeltaIntervalUnits	1.3.6.1.4.1.9.9.701.1.1.1.9	DisplayString	read-only	This object represents the units for csmScrubDeltaInterval.
U32 csmScrubRetryInterval	1.3.6.1.4.1.9.9.701.1.1.1.10	Unsigned32	read-write	This object represents the amount of time a rate-adaptive scrub algorithm waits before increasing the csmScrubRunInterval.
STR csmScrubRetryIntervalUnits	1.3.6.1.4.1.9.9.701.1.1.1.11	DisplayString	read-only	This object represents the units for csmScrubConfigRetryInterval.
U32 csmScrubCurrentInterval	1.3.6.1.4.1.9.9.701.1.1.1.12	Unsigned32	read-only	This object represents the current interval between which scrubs or SEU-mitigation runs. A value of 0 (zero) indicates that the scrubs or runs are back-to-back.
STR csmScrubCurrentIntervalUnits	1.3.6.1.4.1.9.9.701.1.1.1.13	DisplayString	read-only	This object represents the units for csmScrubCurrentInterval.
U32 csmScrubThresholdInterval	1.3.6.1.4.1.9.9.701.1.1.1.14	Unsigned32	read-write	This object represents the period of time that a rate-adaptive scrub algorithm will check for csmScrubThresholdErrorValue being exceeded. If the threshold is exceeded within this sliding time window, the scrub rate will increase.
STR csmScrubThresholdIntervalUnits	1.3.6.1.4.1.9.9.701.1.1.1.15	DisplayString	read-only	This object indicates the units for csmScrubConfigThresholdInterval.
U32 csmScrubThresholdIntervalCount	1.3.6.1.4.1.9.9.701.1.1.1.16	Unsigned32	read-write	This object represents the number of error interrupts received before a rate-adaptive scrub or SEU-mitigation algorithm decreases the scrub interval.
U32 csmScrubThresholdErrorValue	1.3.6.1.4.1.9.9.701.1.1.1.17	Unsigned32	read-write	This object represents the error threshold above which, when it occurs during sliding window (csmScrubThresholdInterval), the scrub or SEU-mitigation rate will increase.
T/F csmScrubRunning	1.3.6.1.4.1.9.9.701.1.1.1.18	TruthValue	read-only	This object indicates whether the scrub or SEU algorithm is running or not. true : Algorithm is running. false : Algorithm is NOT running.
INT csmScrubStatus	1.3.6.1.4.1.9.9.701.1.1.1.19	INTEGER	read-only	This object indicates whether an adaptive scrub or SEU algorithm is performing scrubs more frequently (elevated) due most likely to more frequent SEUs or decreased due to less frequent SEUs, or at a normal rate.
DAT csmScrubLastRun	1.3.6.1.4.1.9.9.701.1.1.1.20	DateAndTime	read-only	This object represents the date and time a scrub or SEU-mitigation algorithm last ran.
U32 csmScrubPassesCompleted	1.3.6.1.4.1.9.9.701.1.1.1.21	Unsigned32	read-only	This object represents the total number of scrub or SEU-mitigations runs since the last 'clear SEU counters' CLI (command line interace) command was issued.
csmScrubErrorsTable	1.3.6.1.4.1.9.9.701.1.2		not-accessible	This table lists the errors and counts for the errors that the scrub algorithms are mitigating. All entries are added with the SEU subsystem is initialized.
csmScrubErrorsEntry	1.3.6.1.4.1.9.9.701.1.2.1		not-accessible	This object represents an entry in the csmScrubErrorsTable.
U32 csmScrubErrorsIndex	1.3.6.1.4.1.9.9.701.1.2.1.1	Unsigned32	not-accessible	This object uniquely identifies the csmScrubEntry.
ENT csmScrubErrorsEntPhysicalIndex	1.3.6.1.4.1.9.9.701.1.2.1.2	EntPhysicalIndexOrZero	read-only	This object is represents the EntityPhysicalIndex (from the ENTITY-MIB) corresponding to the physical entity upon which the scrub or SEU-mitigation is being performed.
STR csmScrubErrorsDescription	1.3.6.1.4.1.9.9.701.1.2.1.3	DisplayString	read-only	This object represents the error name and may include things such as DDR memory errors, cache errors, register errors, and other processor-specific register errors.
STR csmScrubErrorsReference	1.3.6.1.4.1.9.9.701.1.2.1.4	DisplayString	read-only	This object provides a reference to a User's Manual entry, if one exists, for processor and other device-specific errors.
C32 csmScrubErrorsSingleBitEx	1.3.6.1.4.1.9.9.701.1.2.1.5	Counter32	read-only	This object counts the single-bit errors for the specific error type described by csmScrubErrorsDescription.
C32 csmScrubErrorsSingleBitInterrupts	1.3.6.1.4.1.9.9.701.1.2.1.6	Counter32	read-only	This object counts number of interrupts thrown, if any, for single-bit errors that occurred for the specific error type described by csmScrubErrorsDescription.
C32 csmScrubErrorsMultibit	1.3.6.1.4.1.9.9.701.1.2.1.7	Counter32	read-only	This object counts the multi-bit errors for the specific error type described by csmScrubErrorsDescription.
C32 csmScrubErrorsMultibitInterrupts	1.3.6.1.4.1.9.9.701.1.2.1.8	Counter32	read-only	This object counts number of interrupts thrown, if any, for multiple-bit errors that occurred for the specific error type described by csmScrubErrorsDescription.
U32 csmSeuEventLogMaxEntries	1.3.6.1.4.1.9.9.701.1.3	Unsigned32	read-only	This object represents the maximum number of entries in the csmSeuEventLogTable.
csmSeuEventLogTable	1.3.6.1.4.1.9.9.701.1.4		not-accessible	This table lists any special error and scrub or SEU-mitigation algorithm events that may have occurred and is limited to csmSeuEventLogMaxEntries. All entries are added with the SEU subsystem is initialized.
csmSeuEventLogEntry	1.3.6.1.4.1.9.9.701.1.4.1		not-accessible	This object represents an entry in the csmSeuEventLogTable.
U32 csmSeuEventLogIndex	1.3.6.1.4.1.9.9.701.1.4.1.1	Unsigned32	not-accessible	This object uniquely identifies the csmScrubEventLogEntry.
STR csmSeuEventLogDescription	1.3.6.1.4.1.9.9.701.1.4.1.2	DisplayString	read-only	This object describes the event of interest.
STR csmSeuEventLogReference	1.3.6.1.4.1.9.9.701.1.4.1.3	DisplayString	read-only	This object provides a reference to a User's Manual entry, if one exists, that describes and provides more detail for the event of interest.
STR csmSeuEventLogAddress	1.3.6.1.4.1.9.9.701.1.4.1.4	DisplayString	read-only	This object provides the hexadecimal address (if one exists) associated with the event that occurred.
DAT csmSeuEventLogTimeStamp	1.3.6.1.4.1.9.9.701.1.4.1.5	DateAndTime	read-only	This object provides a date-and-time-stamp for the event that occurred.
ciscoSeuMitigationMIBConform	1.3.6.1.4.1.9.9.701.2
ciscoSeuMitigationMIBCompliances	1.3.6.1.4.1.9.9.701.2.1
ciscoSeuMitigationMIBCompliance	1.3.6.1.4.1.9.9.701.2.1.1			This is the module-compliance containing default object groups.
ciscoSeuMitigationMIBGroups	1.3.6.1.4.1.9.9.701.2.2
ciscoSeuMitigationMIBMainObjectGroup	1.3.6.1.4.1.9.9.701.2.2.1			This is the list of objects that are required for an agent to support the CISCO-SEU-MITIGATION-MIB.
ciscoSeuMitigationMIBNotificationGroup	1.3.6.1.4.1.9.9.701.2.2.2			This is the list of Notifications required for an agent to support the CISCO-SEU-MITIGATION-MIB.

RFC description

Cisco MIB for Single Event Upset (SEU) mitigation monitoring on radiation-hardened satellite platforms, reports scrub algorithm status and memory/cache error tracking.

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Download CISCO-SEU-MITIGATION-MIB