JUNIPER-SONET-MIB

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Organization: Juniper Networks, Inc.

Last Updated: 2003-07-18

Category: Technology: Optical Transport, Vendor: Juniper

Description: Juniper Networks MIB extending SONET/SDH interface statistics and alarm management on Juniper routing platforms.

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What Is JUNIPER-SONET-MIB?

JUNIPER-SONET-MIB is a Juniper Networks enterprise MIB extending SONET/SDH interface management, adding alarm history and current-alarm status on top of the standard SONET-MIB for Juniper's SONET/SDH-equipped routers. It exposes a table of current active alarms per interface along with a record of the most recent alarm, including its ID, timestamp (date and time), and event type. Its monitoring focus is hardware/line-level fault detection: catching loss-of-signal, loss-of-frame, or other SONET line/path alarms that indicate a failing optical transceiver, fiber cut, or upstream carrier issue. It explicitly builds on the standard IETF SONET-MIB, adding Juniper-specific alarm detail on top of the base interface statistics that MIB defines. It is deployed on Juniper routers with SONET/SDH interface modules, typically in service-provider core/edge and enterprise WAN environments using legacy optical transport. Engineers can download the JUNIPER-SONET-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in JUNIPER-SONET-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

Juniper Networks routers with SONET/SDH interface modules

Monitoring Examples

An administrator polls jnxSonetAlarmTable (jnxSonetAlarmEntry) to see jnxSonetCurrentAlarms bitmask per interface, and checks jnxSonetLastAlarmId, jnxSonetLastAlarmEvent, jnxSonetLastAlarmDate, and jnxSonetLastAlarmTime to determine the nature and timing of the most recent fault, such as a loss-of-signal event. A nonzero jnxSonetCurrentAlarms value persisting across polls indicates an active, unresolved line condition rather than a transient blip, prompting investigation of the optical transceiver or fiber path. jnxSonetAlarms notifications are expected to fire (via jnxSonetNotificationPrefix traps) when a new alarm is raised.

What Can Be Monitored

current active SONET/SDH alarms
last alarm ID and event type
last alarm date/time
SONET line/path fault status

Imported Objects

From IF-MIB

ifDescr	OBJECT-TYPE
ifIndex	OBJECT-TYPE

From JUNIPER-SMI

jnxMibs	OBJECT-IDENTITY
jnxSonetNotifications	OBJECT-IDENTITY

From SNMPv2-SMI

MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
TimeTicks

From SNMPv2-TC

DateAndTime
TEXTUAL-CONVENTION

How to Use in IPNetwork Monitor

Example using jnxSonetLastAlarmEvent OID:

Select a Juniper router 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 jnxSonetLastAlarmEvent 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 indicates whether the last alarm event set a new alarm or cleared an existing alarm. 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 'cleared', 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
jnxSonet	1.3.6.1.4.1.2636.3.20			This MIB module defines objects used for managing the sonet/sdh interfaces of Juniper products.
jnxSonetAlarms	1.3.6.1.4.1.2636.3.20.1
jnxSonetAlarmTable	1.3.6.1.4.1.2636.3.20.1.1		not-accessible	Information about alarms on all the sonet/sdh physical interfaces on this router.
jnxSonetAlarmEntry	1.3.6.1.4.1.2636.3.20.1.1.1		not-accessible	Information about alarms on a sonet/sdh physical interface on this router.
JNX jnxSonetCurrentAlarms	1.3.6.1.4.1.2636.3.20.1.1.1.1	JnxSonetAlarmId	read-only	This object identifies all the active sonet/sdh alarms on this interface.
JNX jnxSonetLastAlarmId	1.3.6.1.4.1.2636.3.20.1.1.1.2	JnxSonetAlarmId	read-only	The object identifies the sonet/sdh alarm that most recently was set or cleared.
TIK jnxSonetLastAlarmTime	1.3.6.1.4.1.2636.3.20.1.1.1.3	TimeTicks	read-only	The value of sysUpTime when the management subsystem learned of the last alarm event.
DAT jnxSonetLastAlarmDate	1.3.6.1.4.1.2636.3.20.1.1.1.4	DateAndTime	read-only	The system date and time when the management subsystem learned of the last alarm event.
INT jnxSonetLastAlarmEventEx	1.3.6.1.4.1.2636.3.20.1.1.1.5	INTEGER	read-only	This indicates whether the last alarm event set a new alarm or cleared an existing alarm.
jnxSonetNotificationPrefix	1.3.6.1.4.1.2636.4.6.0
NTF jnxSonetAlarmSet	1.3.6.1.4.1.2636.4.6.0.1			Notification of a recently set sonet/sdh alarm.
NTF jnxSonetAlarmCleared	1.3.6.1.4.1.2636.4.6.0.2			Notification of a recently cleared sonet/sdh alarm.

RFC description

Manages SONET and SDH interface alarms, line faults, and performance monitoring for high-speed circuits.

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Download JUNIPER-SONET-MIB