SONUS-SONET-APS-MIB

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Organization: Sonus Networks, Inc.

Last Updated: 2001-02-03

Category: Optical Transport Management, Sonus Networks VoIP Softswitch

Description: Manages Sonus Networks softswitch SONET automatic protection switching configuration and ring/linear switchover.

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What Is SONUS-SONET-APS-MIB?

SONUS-SONET-APS-MIB is a private MIB from Sonus Networks (a VoIP softswitch/media gateway vendor) for managing SONET Automatic Protection Switching (APS) on the SONET transport interfaces of Sonus platforms, based on ANSI T1.105.01 and Telcordia GR-253-CORE standards for linear APS architectures. It exposes configuration and status data for each APS protection group, including the group's architecture (e.g., 1+1 or 1:N), administrative switching direction, extra-traffic allowance, and bit-error-rate thresholds for signal-fail and signal-degrade conditions. For hardware/software status monitoring this MIB is squarely fault-focused for the physical transport layer: it reports each APS group's operational status (working vs. protection line active), lets an operator confirm BER thresholds are correctly set to trigger protection switching, and provides notifications when a switchover occurs — key indicators of physical-layer link degradation on carrier-grade SONET circuits. It explicitly builds on ANSI T1.105.01 and Telcordia GR-253-CORE SONET APS standards for its object semantics. It is deployed on Sonus Networks media gateway/softswitch platforms with SONET transport interfaces in carrier telecommunications networks. Engineers can download the SONUS-SONET-APS-MIB file directly to load it into their MIB browser.

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

Sonus Networks media gateway/softswitch with SONET interfaces

Monitoring Examples

An operator would poll the sonusApsGroupTable/sonusApsGroupEntry rows, indexed by sonusApsGroupId, to check sonusApsGroupStatus and confirm whether traffic is currently on the working or protection line for that group. Comparing sonusApsGroupSignalFailBerThreshold and sonusApsGroupSignalDegradeBerThreshold against real-time BER helps confirm the group is configured to switch over before a hard failure. A sonusSonetApsMIBNotifications trap firing alongside a change in sonusApsGroupStatus would indicate a protection switchover just occurred, warranting investigation into the working SONET line, while sonusApsGroupWaitToRestoreTime governs when the line reverts after signal quality is restored.

What Can Be Monitored

APS group operational status (working/protection)
signal-fail and signal-degrade BER thresholds
APS architecture and switching direction
wait-to-restore timer
protection switchover notifications

Imported Objects

From IF-MIB

InterfaceIndex
ifIndex	OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Gauge32
Integer32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
TimeTicks

From SNMPv2-TC

DisplayString
RowStatus
TEXTUAL-CONVENTION

From SONUS-SMI

sonusServicesMIBs

OBJECT-IDENTITY

How to Use in IPNetwork Monitor

Example using sonusApsGroupProtectionSwitchingByteFailures OID:

Select a Sonus Networks media gateway/softswitch with SONET interface (linear APS protection-group 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 sonusApsGroupProtectionSwitchingByteFailures 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. It reports a count of APS Protection Switching Byte failures. 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
sonusSonetApsMIB	1.3.6.1.4.1.2879.2.5.9			The MIB module for managing SONET linear Automatic Protection Switching (APS) architectures. The objects defined in this MIB are based on the following industry references: 1. ANSI T1.105.01-1995, 'Synchronous Optical Network (SONET) - Automatic Protection Switching'. 2. Telcordia Technologies (Bellcore) GR-253-CORE, Issue 2, Revision 2 (January 1999), 'SONET Transport Systems: Common Criteria References' sections 5.3 and 6.2.1.1.6.
sonusSonetApsMIBObjects	1.3.6.1.4.1.2879.2.5.9.1
G32 sonusApsGroupCount	1.3.6.1.4.1.2879.2.5.9.1.1	Gauge32	read-only	The number of APS groups currently active.
sonusApsGroupTable	1.3.6.1.4.1.2879.2.5.9.1.2		not-accessible	This table provides the configuration and status information for SONET APS groups.
sonusApsGroupEntry	1.3.6.1.4.1.2879.2.5.9.1.2.1		not-accessible	An entry in the SONET APS group table.
NUM sonusApsGroupId	1.3.6.1.4.1.2879.2.5.9.1.2.1.1	InterfaceIndex	not-accessible	The ifIndex for the SONET line that is the designated Protection line. The protection line's ifIndex provides a unique id for the group which it protects.
ROW sonusApsGroupStatus	1.3.6.1.4.1.2879.2.5.9.1.2.1.2	RowStatus	read-create	The status of the MIB table entry (row). See SNMPv2-TC for the definition and use of RowStatus.
INT sonusApsGroupArchitecture	1.3.6.1.4.1.2879.2.5.9.1.2.1.3	INTEGER	read-create	The linear APS architecure for this group of lines. An attempt to create a row in this table indicating the 1:n architecture on an LTE that only supports the 1+1 architecture shall result in an inconstentValue error.
INT sonusApsGroupAdminDirection	1.3.6.1.4.1.2879.2.5.9.1.2.1.4	INTEGER	read-create	The desired APS directional mode that the APS group is to operate in. The default for the 1+1 architecture is unidirectional. The default for the 1:n architecture is bidirectional.
INT sonusApsGroupAdminSwitching	1.3.6.1.4.1.2879.2.5.9.1.2.1.5	INTEGER	read-create	The desired APS switching mode that the APS channel is to operate in. This variable is only provided if the sonusApsGroupArchitecture is onePlusOne(1).
INT sonusApsGroupExtraTraffic	1.3.6.1.4.1.2879.2.5.9.1.2.1.6	INTEGER	read-create	Extra traffic may be carried on the protection channel in a 1:n architecture if this variable is enabled. It may be necessary to disable this in order to interwork with other SONET network elements that don't support extra traffic. This variable is not provided if the sonusApsGroupArchitecture is onePlusOne(1).
I32 sonusApsGroupSignalFailBerThreshold	1.3.6.1.4.1.2879.2.5.9.1.2.1.7	Integer32	read-create	The BER threshold at which a Signal Fail is declared. The value is the negative power of 10 (n - where threshold is 1x10**-n).
I32 sonusApsGroupSignalDegradeBerThreshold	1.3.6.1.4.1.2879.2.5.9.1.2.1.8	Integer32	read-create	The BER threshold at which a Signal Degrade is declared. The value is the negative power of 10 (n - where threshold is 1x10**-n).
I32 sonusApsGroupWaitToRestoreTime	1.3.6.1.4.1.2879.2.5.9.1.2.1.9	Integer32	read-create	The Wait to Restore (WTR) Time in minutes.
STR sonusApsGroupName	1.3.6.1.4.1.2879.2.5.9.1.2.1.10	DisplayString	read-create	A textual name for the APS group.
I32 sonusApsGroupSwitchedChannel	1.3.6.1.4.1.2879.2.5.9.1.2.1.11	Integer32	read-only	The number of the working channel that is currently being switched to the protection line. If no working channel is being switched, this value is zero (0). If the protection line is being used for extra traffic, this value is 15.
BIT sonusApsGroupOperStatus	1.3.6.1.4.1.2879.2.5.9.1.2.1.12	Bits	read-only	The current status of the APS group. Bit 0 - Extra Traffic. Indicates that extra traffic is currently being accepted on the protection line. Bit 1 - Protection Switching Byte Defect. Indicates that either an inconsistent APS byte or an invalid code has been detected. Bit 2 - Channel Mismatch. Indicates that a mismatch between the transmitted K1 channel and the received K2 channel has been detected. Bit 3 - APS Mode Mismatch. Indicates a conflict between the current local mode and the received K2 mode information. Modes other than 1+1 unidirectional monitor protection line: K2 bit 5 indicates the architecture; K2 bits 6-8 indicate if the mode is unidirectional or bidirectional. Bit 4 - Far-End Protection-Line Defect. Indicates the LTE received an SF code for the protection line, which means that the far-end LTE is no longer receiving its request, or (in bidirectional operation) the far-end LTE considers the near-end LTE's request to be invalid.
APS sonusApsGroupK1K2Received	1.3.6.1.4.1.2879.2.5.9.1.2.1.13	ApsK1K2	read-only	The current value of the K1 and K2 bytes received on the protection line.
APS sonusApsGroupK1K2Transmitted	1.3.6.1.4.1.2879.2.5.9.1.2.1.14	ApsK1K2	read-only	The current value of the K1 and K2 bytes transmitted on the protection line.
C32 sonusApsGroupProtectionSwitchingByteFailuresEx	1.3.6.1.4.1.2879.2.5.9.1.2.1.15	Counter32	read-only	A count of APS Protection Switching Byte failures. A Protection Switching Byte defect occurs when either an inconsistent APS byte or an invalid code is detected. An inconsistent APS byte occurs when no three consecutive K1 bytes of the last 12 successive frames are identical, starting with the last frame containing a previously consistent byte. An invalid code occurs when the incoming K1 byte contains an unused code, or a code irrelevant for the specific switching operation (e.g., Reverse Request while no switching request is outstanding) in three consecutive frames. An invalid code also occurs when the incoming K1 byte contains an invalid channel number in three consecutive frames.
C32 sonusApsGroupChannelMismatches	1.3.6.1.4.1.2879.2.5.9.1.2.1.16	Counter32	read-only	A count of Channel Mismatch failures. A Channel Mismatch indicates that a mismatch between the transmitted K1 channel and the received K2 channel has been detected. Under normal conditions, a mismatch will occure each time the LTE changes the channel number on its transmitted K1 byte (i.e., when the channel with the highest priority switch request changes). A mismatch could also occur if the channel number on the incoming K2 byte changes (e.g., due to a failure at the far-end LTE).
C32 sonusApsGroupModeMismatches	1.3.6.1.4.1.2879.2.5.9.1.2.1.17	Counter32	read-only	A count of APS Mode Mismatch failures. An APS Mode Mismatch is a conflict between the current local mode and the received K2 mode information. An LTE in a mode other than 1+1 unidirectional must monitor the mode of operation indicators in the incoming K2 byte of the protection line for APS Mode Mismatch failures. K2 bit 5 indicates the architecture; K2 bits 6-8 indicate if the mode is unidirectional or bidirectional.
C32 sonusApsGroupFarEndProtectionLineFailures	1.3.6.1.4.1.2879.2.5.9.1.2.1.18	Counter32	read-only	A count of APS Far-End Protection-Line failures. Unless it is operating in the 1+1 unidirectional mode, the LTE must monitor the K1 byte for Far-End Protection-Line failures.
TIK sonusApsGroupCreationTime	1.3.6.1.4.1.2879.2.5.9.1.2.1.19	TimeTicks	read-only	The value of SNMPv2-MIB:sysUpTime at the time the associated sonusApsGroupStatus variable was set to active(1).
sonusApsChannelTable	1.3.6.1.4.1.2879.2.5.9.1.3		not-accessible	This table provides the control and status information for individual SONET APS channels.
sonusApsChannelEntry	1.3.6.1.4.1.2879.2.5.9.1.3.1		not-accessible	An entry in the SONET APS channel table.
I32 sonusApsChannelNumber	1.3.6.1.4.1.2879.2.5.9.1.3.1.1	Integer32	not-accessible	The number for the APS channel within the APS group. Number 0 is for the null channel (associated with the protection line). Number 15 designates the extra traffic channel. Numbers 1 thru 14 are for working channels. For an APS group in the 1+1 architecture, there are only two channels: the null channel (0) and the first working channel (1).
NUM sonusApsChannelLineId	1.3.6.1.4.1.2879.2.5.9.1.3.1.2	InterfaceIndex	read-create	The ifIndex for the SONET line that is associated with this APS channel. This variable is used to add working channels to an APS group; a channel is not configured without a valid SONET line interface to use as a working line.
INT sonusApsChannelPriority	1.3.6.1.4.1.2879.2.5.9.1.3.1.3	INTEGER	read-create	The priority of the channel. This variable deterimines whether high or low priority SD and SF codes are used in K1 requests. This variable is not present if the channel belongs to an APS group using the 1+1 architecture.
INT sonusApsChannelSwitchCommand	1.3.6.1.4.1.2879.2.5.9.1.3.1.4	INTEGER	read-create	A switch command initiates one external request for evaluation. (1) Clear - Clears all switch commands on the channel. (2) Lockout Of Protection - Prevents any of the working channels from switching to the protection line by issuing a Lockout of Protection request [unless a request of equal priority (i.e., a Lockout of Protection) is already in effect]. (3) Forced Switch of Working (to Protection) - Switches the working channel to the protection line unless a request of equal or higher priority is in effect, by issuing a Forced Switch request. (4) Forced Switch of Protection (to Working) - Switches the working channel back from the protection line to the working line unless a request of equal or higher priority is in effect, by issuing a Forced Switch request. This command applies only in the 1+1 architecture. (5) Manual Switch of Working (to Protection) - Switches the working channel to the protection line unless a request of equal or higher priority is in effect, by issuing a Manual Switch request. (6) Manual Switch of Protection (to Working) - Switches the working channel back from the protection line to the working line unless a request of equal or higher priority is in effect, by issuing a Manual Switch request. This command applies only in the 1+1 architecture for the null. (7) Exercise - Exercises the protocol for a protection switch unless a request of equal or higher priority is in effect, by issuing an Exercise request and checking the response on the APS channel. Reading this variable always returns zero (0).
INT sonusApsChannelControlCommand	1.3.6.1.4.1.2879.2.5.9.1.3.1.5	INTEGER	read-create	A control command controls the APS operation. (1) Lockout a Working Channel - Prevents the specified working channel from switching to the protection line. (2) Clear Lockout-a-Working-Channel - Clears the Lockout a Working Channel command for the specified channel. Reading this variable always returns zero (0). This variable is not provided if the channels's GroupArchitecture is onePlusOne(1).
BIT sonusApsChannelStatus	1.3.6.1.4.1.2879.2.5.9.1.3.1.6	Bits	read-only	Indicates the current state of the channel. Bit 0 - Signal Degrade (SD) Condition. Indicates a 'soft failure' condition resulting from the Line BER exceeding a pre-selected threshold. Bit 1 - Signal Fail (SF) Condition. Indicates a 'hard failure' condition detected on the incoming OC-N signal. Bit 2 - Locked Out. This bit, when applied to a working channel, indicates that the channel is prevented from switching to the protection line. When applied to the null channel, this bit indicates that no working channel may switch to the protection line. The remaining states only apply to working channels which have attempted to initiate an automatic protection switch. Bit 3 - Switched. Indictes that the working channel is currently switched to the protection line. Bit 4 - Both Lines Failed. Indictes that both the working line and the protection line are currently in a failure state. Bit 5 - Protection Line Busy. Indictes that the protection line is busy servicing a different working channel. (This condition can only occur in the 1:n architecture.)
INT sonusApsChannelOperDirectionMode	1.3.6.1.4.1.2879.2.5.9.1.3.1.7	INTEGER	read-only	The current APS directional mode that the APS channel is operating in.
C32 sonusApsChannelSignalDegrades	1.3.6.1.4.1.2879.2.5.9.1.3.1.8	Counter32	read-only	A count of Signal Degrade conditions. This condition occurs when the line Bit Error Rate exceeds the currently configured threshold.
C32 sonusApsChannelSignalFails	1.3.6.1.4.1.2879.2.5.9.1.3.1.9	Counter32	read-only	A count of Signal Fail conditions that have been detected on the incoming signal. This condition occurs when a loss of signal, loss of frame, AIS-L or a Line bit error rate exceeding 10^-3 is detected on an incoming line.
C32 sonusApsChannelSwitchovers	1.3.6.1.4.1.2879.2.5.9.1.3.1.10	Counter32	read-only	The number of switchovers that have occurred on this channel.
TIK sonusApsChannelLastSwitchover	1.3.6.1.4.1.2879.2.5.9.1.3.1.11	TimeTicks	read-only	The value of sysUpTime when this channel last switched over.
ROW sonusApsChannelRowStatus	1.3.6.1.4.1.2879.2.5.9.1.3.1.12	RowStatus	read-create	The status of the MIB table entry (row). See SNMPv2-TC for the definition and use of RowStatus.
sonusApsLineTable	1.3.6.1.4.1.2879.2.5.9.1.4		not-accessible	This table provides a mapping of ifIndex values for SONET lines to their corresponding APS channels. Only interfaces whose ifType value is sonet(39) will have entries in this table.
sonusApsLineEntry	1.3.6.1.4.1.2879.2.5.9.1.4.1		not-accessible	An entry in the APS line table.
NUM sonusApsLineGroupId	1.3.6.1.4.1.2879.2.5.9.1.4.1.1	InterfaceIndex	read-only	The ifIndex that provides a unique id for the APS group.
I32 sonusApsLineChannelNumber	1.3.6.1.4.1.2879.2.5.9.1.4.1.2	Integer32	read-only	The identifying number of the APS channel within the APS group.
sonusSonetApsMIBNotifications	1.3.6.1.4.1.2879.2.5.9.2
sonusSonetApsMIBNotificationsPrefix	1.3.6.1.4.1.2879.2.5.9.2.0
NTF sonusApsTrapProtectionSwitchingByteFailure	1.3.6.1.4.1.2879.2.5.9.2.0.1			A sonusApsTrapProtectionSwitchingByteFailure notification is sent when the value of an instance of sonusApsGroupProtectionSwitchingByteFailures increments.
NTF sonusApsTrapChannelMismatch	1.3.6.1.4.1.2879.2.5.9.2.0.2			A sonusApsTrapChannelMismatch notification is sent when the value of an instance of sonusApsStatusChannelMismatches increments.
NTF sonusApsTrapModeMismatch	1.3.6.1.4.1.2879.2.5.9.2.0.3			A sonusApsTrapModeMismatch notification is sent when the value of an instance of sonusApsStatusModeMismatches increments.
NTF sonusApsTrapFarEndProtectionLineFailure	1.3.6.1.4.1.2879.2.5.9.2.0.4			A sonusApsTrapFarEndProtectionLineFailure notification is sent when the value of an instance of sonusApsGroupFarEndProtectionLineFailures increments.
NTF sonusApsTrapSwitchover	1.3.6.1.4.1.2879.2.5.9.2.0.5			A sonusApsTrapSwitchover notification is sent when the value of an instance of sonusApsChanSwitchovers for a working channel increments.
sonusSonetApsConformance	1.3.6.1.4.1.2879.2.5.9.3
sonusSonetApsGroups	1.3.6.1.4.1.2879.2.5.9.3.1
sonusApsGroupGroup	1.3.6.1.4.1.2879.2.5.9.3.1.1			The objects which are used to provide SONET APS group configuration and status.
sonusApsChannelGroup	1.3.6.1.4.1.2879.2.5.9.3.1.2			The objects which are used to provide SONET APS channel configuration and status.
sonusApsLineGroup	1.3.6.1.4.1.2879.2.5.9.3.1.3			The objects which are used to provide the mapping of SONET lines to APS channels.
sonusApsNotificationGroup	1.3.6.1.4.1.2879.2.5.9.3.1.4			The notifications (traps) that may be supported for the LTE.
sonusSonetApsCompliances	1.3.6.1.4.1.2879.2.5.9.3.2
sonusSonetApsCompliance	1.3.6.1.4.1.2879.2.5.9.3.2.1			The compliance statement for this MIB.

RFC description

Manages Sonus Networks SONET automatic protection switching (APS) for linear and ring topologies, implementing ANSI T1.105.01-1995 APS architectures for carrier-grade transport.

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