CISCO-BITS-CLOCK-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 2005-01-21

Category: Cisco Devices, Hardware and Environment

Description: Manages BITS (Building Integrated Timing Supply) clock source selection on Cisco TDM platforms.

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What Is CISCO-BITS-CLOCK-MIB?

CISCO-BITS-CLOCK-MIB is a Cisco proprietary MIB for TDM/synchronization-capable platforms that manages Building Integrated Timing Supply (BITS) clock sources, the external timing references used to synchronize TDM interfaces per telecom timing standards. It exposes a clock-source table describing each source's administrative and current operating role (e.g., primary, secondary, unused), a timestamp of the last role change, cumulative active/inactive seconds, and a textual description, alongside a notification-enable flag for clock-related traps. In monitoring terms it directly supports fault and availability monitoring of timing infrastructure: tracking whether a clock source is active or has failed over, how long it has been in each state, and generating alarms aligned with GR-1233CORE major/critical alarm sections when clocking sources change roles or become unavailable — a software/hardware-state indicator critical to TDM network stability. It explicitly references the Telcordia GR-1233CORE standard for alarm severity classification. The CISCO-BITS-CLOCK-MIB MIB is typically deployed on Cisco TDM/carrier-grade platforms requiring synchronized timing distribution (e.g., SONET/SDH, T1/E1 aggregation).

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-BITS-CLOCK-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 TDM/synchronization-capable platforms (carrier/telecom equipment)

Monitoring Examples

An administrator would poll cBitsClkSourceTable/cBitsClkSourceEntry, keyed by clock source index, checking cBitsClkSourceRoleCurrent against cBitsClkSourceRoleAdmin to detect an unplanned failover from a primary to a backup timing source. cBitsClkSourceTimestamp paired with cBitsClkSourceActiveSeconds and cBitsClkSourceInactiveSeconds reveals how recently and how often a clock source has changed state, while cBitsClkNotifEnabled controls whether such role changes generate SNMP traps via ciscoBitsClockMIBNotifs. A clock source whose cBitsClkSourceRoleCurrent unexpectedly drops to an unused/unavailable role would indicate a timing-reference fault requiring investigation per GR-1233CORE alarm procedures.

What Can Be Monitored

clock source administrative role
clock source current operating role
role change timestamp
cumulative active seconds
cumulative inactive seconds
clock notification enable state

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From ENTITY-MIB

entPhysicalDescr	OBJECT-TYPE
entPhysicalIndex	OBJECT-TYPE

From SNMP-FRAMEWORK-MIB

SnmpAdminString

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

Counter32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE

From SNMPv2-TC

TimeStamp
TruthValue

How to Use in IPNetwork Monitor

Example using cBitsClkSourceActiveSeconds OID:

Select a Cisco TDM/synchronization-capable platform (carrier/telecom) 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 cBitsClkSourceActiveSeconds 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 total number of seconds that this clock source was active and able to serve role as specified as cBitsClkSourceRoleCurrent object. 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 sharply between polls relative to its normal baseline (in seconds), since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
ciscoBitsClockMIB	1.3.6.1.4.1.9.9.459			This MIB provides information on Building Integrated Timing Supply(BITS) clocking sources and modes of operations. It is used to generate notifications to indicate when clocking sources change roles or become unavailable. GR-1233CORE sections 8.1.2 Major Alarms and 8.1.3 Critical Alarms
ciscoBitsClockMIBNotifs	1.3.6.1.4.1.9.9.459.0
NTF ciscoBitsClockSource	1.3.6.1.4.1.9.9.459.0.1			Indicates the clock source has switch roles as clock source as indicated by cBitsClkSourceRoleCurrent
NTF ciscoBitsClockFreerun	1.3.6.1.4.1.9.9.459.0.2			An external clock source is unavailable. The internal clock will operate in freerun mode using appropiate local oscillator. Therefore, it does not provide synchronous clocking. This is the least stable of all operating modes.
NTF ciscoBitsClockHoldover	1.3.6.1.4.1.9.9.459.0.3			An external clock source is unavailable. The internal clock will operate in holdover mode. The network clock module has stored information about the incoming clock signal, it can faithfully reproduce the lost signal while in holdover mode until a switchover to another clock source occurs.
ciscoBitsClockMIBObjects	1.3.6.1.4.1.9.9.459.1
cBitsClkSourceTable	1.3.6.1.4.1.9.9.459.1.1		not-accessible	This table contains one row per clock source and is a sparse augmentation of the entPhysicalTable. This table provides additional information for each entry of the entPhysicalTable that acts as clock source.
cBitsClkSourceEntry	1.3.6.1.4.1.9.9.459.1.1.1		not-accessible	Information about a particular clock source.
INT cBitsClkSourceRoleAdmin	1.3.6.1.4.1.9.9.459.1.1.1.1	INTEGER	read-only	Indicates the role of this clock source as defined by system administrator.
INT cBitsClkSourceRoleCurrent	1.3.6.1.4.1.9.9.459.1.1.1.2	INTEGER	read-only	The current role of BITS clock source. Also, indicates when clock source is unavailable. The 'unavailable' value indicates that the external source of clock signal has failed and indicates that this entry can not serve as clock source.
TIM cBitsClkSourceTimestamp	1.3.6.1.4.1.9.9.459.1.1.1.3	TimeStamp	read-write	Timestamp used it indicate when this clock source entered the current role defined by cBitsClkSourceRoleCurrent object
C32 cBitsClkSourceActiveSecondsEx	1.3.6.1.4.1.9.9.459.1.1.1.4	Counter32	read-only	The total number of seconds that this clock source was active and able to serve role as specified as cBitsClkSourceRoleCurrent object.
C32 cBitsClkSourceInactiveSeconds	1.3.6.1.4.1.9.9.459.1.1.1.5	Counter32	read-only	The total number of seconds that this clock source was inactive and unable to serve role as specified as cBitsClkSourceRoleCurrent object.
STR cBitsClkSourceDescription	1.3.6.1.4.1.9.9.459.1.1.1.6	SnmpAdminString	read-only	This will provide description in addition to entPhysicalDescr or ifDescr(if available) for the clock source.
T/F cBitsClkNotifEnabled	1.3.6.1.4.1.9.9.459.1.2	TruthValue	read-write	The BITS clocking notification truth value. 'true' Indicates that all notification contained within this MIB are to be generated. 'false' Indicates that all notification contained within this MIB are disabled.
ciscoBitsClockMIBConform	1.3.6.1.4.1.9.9.459.2
ciscoBitsClockMIBCompliances	1.3.6.1.4.1.9.9.459.2.1
ciscoBitsClockMIBCompliance	1.3.6.1.4.1.9.9.459.2.1.1			The compliance statement for entities which implement the CISCO-BITS-CLOCK-MIB.my MIB
ciscoBitsClockMIBGroups	1.3.6.1.4.1.9.9.459.2.2
ciscoBitsClockSourceGroup	1.3.6.1.4.1.9.9.459.2.2.1			BITS Clock Source Object Group
ciscoBitsClockNotifGroup	1.3.6.1.4.1.9.9.459.2.2.2			BITS Clock Source Notifications Group

RFC description

Building Integrated Timing Supply (BITS) clocking source management and failover.

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