SL-ALARM-MIB

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Organization: Smartoptics

Last Updated: 2000-08-28

Description: MIB for monitoring SONET/SDH and optical alarms (LOS, LOF, AIS, RFI, signal degrade) on Smartoptics SiteLight network elements

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What Is SL-ALARM-MIB?

SL-ALARM-MIB is a vendor-specific SNMP module from Smartoptics for its SiteLight optical transport network elements, dedicated entirely to alarm management for SONET/SDH and optical transmission faults. It defines a per-interface alarm configuration table along with alarm type, severity, and service-affecting classification for conditions such as Loss of Signal (LOS), Loss of Frame (LOF), Alarm Indication Signal (AIS), Remote Failure Indication (RFI), and signal degrade. Its monitoring purpose is entirely fault/hardware status oriented: it lets an administrator see which optical alarms are currently active on which interface, their severity and whether they are service-affecting, when they occurred, and whether an operator has acknowledged them, which is essential for triaging optical link failures quickly. It builds on standard SONET/SDH alarm concepts (LOS/LOF/AIS/RFI) defined by telecom transmission standards, giving it a conceptual dependency on those industry conventions even though it is implemented as a Smartoptics enterprise MIB. It would be deployed in optical transport/DWDM network operations centers monitoring SiteLight network elements for line-level faults, and NOC engineers can perform an SL-ALARM-MIB download to load these alarm objects into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in SL-ALARM-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

Smartoptics SiteLight optical network element
SONET/SDH transport equipment

Monitoring Examples

The slAlarmConfigTable (slAlarmConfigEntry, indexed by slAlarmIfIndex) exposes slAlarmType, slAlarmSeverity, and slAlarmServiceAffect per interface, letting an operator poll for any interface currently reporting a service-affecting LOS or LOF alarm. slAlarmActive, slAlarmTimeStamp, and slAlarmAcknowledged let a NOC operator see whether a raised alarm is still active, when it first occurred, and whether anyone (tracked via slAlarmAckUser) has acknowledged it, while the slAlarmTraps notification would push new alarm events to a management station in real time rather than requiring constant polling.

What Can Be Monitored

active optical alarms (LOS/LOF/AIS/RFI/signal degrade)
alarm severity
service-affecting status
alarm acknowledgment state
alarm timestamp
per-interface alarm configuration

Imported Objects

From IF-MIB

InterfaceIndex

From PerfHist-TC-MIB

PerfCurrentCount
PerfIntervalCount
PerfTotalCount

From SL-MAIN-MIB

slMain	MODULE-IDENTITY
slmTrapLogId	OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE

From SNMPv2-TC

DisplayString
TEXTUAL-CONVENTION
TimeStamp
TruthValue

How to Use in IPNetwork Monitor

Example using slAlarmSeverity OID:

Select a Smartoptics SiteLight optical network element, SONET/SDH transport equipment (per-interface alarm status) 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 slAlarmSeverity 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. The alarm severity. 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 an INTEGER-type OID, Value bounds is the most useful condition here — trigger an alert if the value is anything other than 'noAlarm', since that indicates the condition this object reports has changed to one worth investigating. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
slAlarmMib	1.3.6.1.4.1.4515.1.3.20			This MIB module describes the ALARMS.
slAlarmConfig	1.3.6.1.4.1.4515.1.3.20.1
slAlarmConfigTable	1.3.6.1.4.1.4515.1.3.20.1.1		not-accessible	This table contains objects to configure the SL Alarms.
slAlarmConfigEntry	1.3.6.1.4.1.4515.1.3.20.1.1.1		not-accessible	An entry exist for each type of alarm. The entry describes the alarm properties.
NUM slAlarmIfIndex	1.3.6.1.4.1.4515.1.3.20.1.1.1.1	InterfaceIndex	read-only	The corresponding interface index. The interface type may be one of: - Sonet Line, - Sonet Path, - CLU - NE.
SLA slAlarmType	1.3.6.1.4.1.4515.1.3.20.1.1.1.2	SlAlarmType	read-only	The alarm type.
INT slAlarmSeverityEx	1.3.6.1.4.1.4515.1.3.20.1.1.1.3	INTEGER	read-only	The alarm severity.
T/F slAlarmServiceAffect	1.3.6.1.4.1.4515.1.3.20.1.1.1.4	TruthValue	read-only	The alarm service affecting Yes/No.
TIM slAlarmTimeStamp	1.3.6.1.4.1.4515.1.3.20.1.1.1.5	TimeStamp	read-only	The calendar time of the alarm.
T/F slAlarmAcknowledged	1.3.6.1.4.1.4515.1.3.20.1.1.1.6	TruthValue	read-write	Allow the NMS to acknowledge an active alarm.
STR slAlarmAckUser	1.3.6.1.4.1.4515.1.3.20.1.1.1.7	DisplayString	read-write	The name of the user that performed the Ack.
STR slAlarmText	1.3.6.1.4.1.4515.1.3.20.1.1.1.8	DisplayString	read-only	The alarm text.
slAlarmTraps	1.3.6.1.4.1.4515.1.3.20.2
slAlarmTraps0	1.3.6.1.4.1.4515.1.3.20.2.0
NTF slAlarmTrap0	1.3.6.1.4.1.4515.1.3.20.2.0.2			An slAlarmTrap0 notification is sent when an alarm occures. It is defined to support browsers that don't recognize RFC 2576.
T/F slAlarmActive	1.3.6.1.4.1.4515.1.3.20.2.1	TruthValue	read-only	The alarm is active Yes/No.
NTF slAlarmTrap	1.3.6.1.4.1.4515.1.3.20.2.2			An slAlarmTrap notification is sent when an alarm occures.

RFC description

Synchronoss Labs (or similar vendor) MIB for alarm and event management; vendor-private.

Start monitoring Smartoptics SiteLight optical network element, SONET/SDH transport equipment (per-interface alarm 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.

Download SL-ALARM-MIB