Juniper-FRACTIONAL-T1-MIB

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Organization: Juniper Networks, Inc.

Last Updated: 2002-09-16

Category: Domain: WAN, Domain: WAN/TDM, Vendor: Juniper

Description: Provides managed objects for fractional T1 WAN interface configuration and performance monitoring on Juniper Networks E-series routers.

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What Is Juniper-FRACTIONAL-T1-MIB?

Juniper-FRACTIONAL-T1-MIB is a Juniper Networks proprietary MIB module for managing fractional T1 WAN interfaces on Juniper E-series routers, where only a subset of a T1 line's 24 timeslots is provisioned for use. It exposes per-interface configuration objects covering timeslot mapping, timeslot data rate, signal polarity, and loopback settings for each fractional T1 circuit. For monitoring, it is used mainly for WAN interface configuration and operational-status verification: administrators check the assigned timeslot map and rate against the provisioned circuit to confirm bandwidth allocation is correct, and monitor loopback configuration state to rule out a stuck test loopback as the cause of a connectivity problem. It depends on the IF-MIB for the underlying physical/logical interface indexing, since juniFt1IfLowerIfIndex links a fractional T1 interface to its parent physical interface. It is typically deployed on Juniper E-series edge routers terminating fractional T1 leased-line circuits in WAN access networks. Network engineers evaluating or troubleshooting this functionality can download the Juniper-FRACTIONAL-T1-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in Juniper-FRACTIONAL-T1-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 E-series routers

Monitoring Examples

An operator would poll juniFt1IfTable/juniFt1IfEntry, keyed by juniFt1IfIndex, to check juniFt1IfTimeSlotMap and juniFt1IfTimeSlotRate against the circuit's provisioned bandwidth, catching a mismatch that would explain unexpectedly low throughput. juniFt1IfLoopbackConfig would be monitored to confirm no interface is stuck in a test loopback state, which would otherwise present as a total loss of end-to-end connectivity. juniFt1IfRowStatus indicates whether a fractional T1 interface entry is currently active, and juniFt1IfDataPolarity would be checked when troubleshooting bit errors caused by inverted line polarity.

What Can Be Monitored

timeslot map/allocation
timeslot data rate
loopback configuration state
line/data polarity
interface row status

Imported Objects

From IF-MIB

InterfaceIndex
InterfaceIndexOrZero

From Juniper-MIBs

juniMibs

MODULE-IDENTITY

From Juniper-TC

JuniNextIfIndex
JuniTimeSlotMap

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

RowStatus

OIDs

OID symbolic	OID numeric	Type	Access	Description
juniFt1MIB	1.3.6.1.4.1.4874.2.2.6			The Fractional T1 MIB for the Juniper Networks enterprise.
juniFt1Objects	1.3.6.1.4.1.4874.2.2.6.1
JUN juniFt1NextIfIndex	1.3.6.1.4.1.4874.2.2.6.1.1	JuniNextIfIndex	read-only	Coordinate ifIndex value allocation for entries in juniFt1IfTable. A GET of this object returns the next available ifIndex value to be used to create an entry in the associated interface table; or zero, if no valid ifIndex value is available. This object also returns a value of zero when it is the lexicographic successor of a varbind presented in an SNMP GETNEXT or GETBULK request, for which circumstance it is assumed that ifIndex allocation is unintended. Successive GETs will typically return different values, thus avoiding collisions among cooperating management clients seeking to create table entries simultaneously.
juniFt1IfTable	1.3.6.1.4.1.4874.2.2.6.1.2		not-accessible	This table contains entries for FT1 interfaces present in the system.
juniFt1IfEntry	1.3.6.1.4.1.4874.2.2.6.1.2.1		not-accessible	Each entry describes the characteristics of an FT1 interface. Creating/deleting entries in this table causes corresponding entries for be created /deleted in ifTable/ifXTable/juniIfTable.
NUM juniFt1IfIndex	1.3.6.1.4.1.4874.2.2.6.1.2.1.1	InterfaceIndex	not-accessible	The ifIndex of the FT1 interface. When creating entries in this table, suitable values for this object are determined by reading juniFt1NextIfIndex.
ROW juniFt1IfRowStatus	1.3.6.1.4.1.4874.2.2.6.1.2.1.2	RowStatus	read-create	Controls creation/deletion of entries in this table according to the RowStatus textual convention, constrained to support the following values only: createAndGo destroy To create an entry in this table, the following entry objects MUST be explicitly configured: juniFt1IfRowStatus juniFt1IfLowerIfIndex juniFt1IfTimeSlotMap In addition, when creating an entry the following conditions must hold: A value for juniFt1IfIndex must have been determined previously, by reading juniFt1NextIfIndex. The DS1 interface identified by juniFt1IfLowerIfIndex must exist. The DS0s specified in juniFt1IfTimeSlotMap must be available (unallocated) on the DS1 interface identified by juniFt1IfLowerIfIndex. A corresponding entry in ifTable/ifXTable/juniIfTable is created/ destroyed as a result of creating/destroying an entry in this table.
NUM juniFt1IfLowerIfIndex	1.3.6.1.4.1.4874.2.2.6.1.2.1.3	InterfaceIndexOrZero	read-create	The ifIndex of a DS1 interface over which this FT1 interface is to be layered. A value of zero indicates no layering. An implementation may choose to require that a nonzero value be configured at entry creation.
JUN juniFt1IfTimeSlotMap	1.3.6.1.4.1.4874.2.2.6.1.2.1.4	JuniTimeSlotMap	read-create	A bitmap representing the DS0s on the underlying DS1 interface that have been allocated to this FT1 interface.
INT juniFt1IfTimeSlotRate	1.3.6.1.4.1.4874.2.2.6.1.2.1.5	INTEGER	read-create	Data rate per time slot allocated to this FT1 interface.
INT juniFt1IfDataPolarity	1.3.6.1.4.1.4874.2.2.6.1.2.1.6	INTEGER	read-create	Obsolete. Polarity of data transmitted on this FT1 interface. Inverted data is used for certain line coding configurations to ensure sufficient one's density for timing recovery by the remote end.
INT juniFt1IfLoopbackConfig	1.3.6.1.4.1.4874.2.2.6.1.2.1.7	INTEGER	read-create	Selects loopback configuration. loop(1) causes received data to be looped back out the transmitter.
juniFt1Conformance	1.3.6.1.4.1.4874.2.2.6.4
juniFt1Compliances	1.3.6.1.4.1.4874.2.2.6.4.1
juniFt1Compliance	1.3.6.1.4.1.4874.2.2.6.4.1.1			Obsolete compliance statement for entities that implement the Juniper FT1 MIB. This statement became obsolete when the interface data polarity object was obsoleted.
juniFt1Compliance2	1.3.6.1.4.1.4874.2.2.6.4.1.2			The compliance statement for entities that implement the Juniper FT1 MIB.
juniFt1Groups	1.3.6.1.4.1.4874.2.2.6.4.2
juniFt1Group	1.3.6.1.4.1.4874.2.2.6.4.2.1			Obsolete collection of objects providing management of FT1 interfaces in a Juniper product. This group became obsolete when the interface data polarity object was obsoleted.
juniFt1Group2	1.3.6.1.4.1.4874.2.2.6.4.2.2			A collection of objects providing management of FT1 interfaces in a Juniper product.

RFC description

Management Information Base for fractional T1 line arrangements on Juniper Networks E-series routers. Provides objects for monitoring and configuring partial T1 circuit usage and performance metrics.

Start monitoring Juniper Networks E-series router (fractional T1 WAN interfaces) 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 Juniper-FRACTIONAL-T1-MIB

What Is Juniper-FRACTIONAL-T1-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description