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16-7
Cisco ONS 15454 Reference Manual, R8.5.x
78-18106-01
Chapter 16 SNMP
16.6.3 Generic Threshold and Performance Monitoring MIBs
16.6.3 Generic Threshold and Performance Monitoring MIBs
A MIB called CERENT-GENERIC-PM-MIB allows network management stations (NMS) to use a
single, generic MIB for accessing threshold and performance monitoring data of different interface
types. The MIB is generic in the sense that it is not tied to any particular kind of interface. The MIB
objects can be used to obtain threshold values, current performance monitoring (PM) counts, and historic
PM statistics for each kind of monitor and any supported interval at the near end and far end.
Previously existing MIBs in the ONS 15454 system provide some of these counts. For example, SONET
interface 15-minute current PM counts and historic PM statistics are available using the SONET-MIB.
DS-1 and DS-3 counts and statistics are available through the DS1-MIB and DS-3 MIB respectively. The
generic MIB provides these types of information and also fetches threshold values and single-day
statistics. In addition, the MIB supports optics and dense wavelength division multiplexing (DWDM)
threshold and performance monitoring information.
The CERENT-GENERIC-PM-MIB is organized into three different tables:
• cerentGenericPmThresholdTable
• cerentGenericPmStatsCurrentTable
• cerentGenericPmStatsIntervalTable
• The cerentGenericPmThresholdTable is used to obtain the threshold values for the monitor types. It
is indexed based on the following items:
• Interface index (cerentGenericPmThresholdIndex)
• Monitor type (cerentGenericPmThresholdMonType). The syntax of
cerentGenericPmThresholdMonType is type cerentMonitorType, defined in CERENT-TC.mib.
• Location (cerentGenericPmThresholdLocation). The syntax of cerentGenericPmThresholdLocation
is type cerentLocation, defined in CERENT-TC.mib.
• Time period (cerentGenericPmThresholdPeriod). The syntax of cerentGenericPmThresholdPeriod
is type cerentPeriod, defined in CERENT-TC.mib.
Threshold values can be provided in 64-bit and 32-bit formats. (For more information about 64-bit
counters, see the “16.10.2 HC-RMON-MIB Support” section on page 16-18.) The 64-bit values in
cerentGenericPmThresholdHCValue can be used with agents that support SNMPv2. The two 32-bit
values (cerentGenericPmThresholdValue and cerentGenericPmThresholdOverFlowValue) can be used
by NMSs that only support SNMPv1. The objects compiled in the cerentGenericPmThresholdTable are
shown in Table 16-4.
The second table within the MIB, cerentGenericPmStatsCurrentTable, compiles the current performance
monitoring (PM) values for the monitor types. The table is indexed based on interface index
(cerentGenericPmStatsCurrentIndex), monitor type (cerentGenericPmStatsCurrentMonType), location
(cerentGenericPmStatsCurrentLocation) and time period (cerentGenericPmStatsCurrentPeriod). The
Table 16-4 cerentGenericPmThresholdTable
Index Objects Information Objects
cerentGenericPmThresholdIndex cerentGenericPmThresholdValue
cerentGenericPmThresholdMonType cerentGenericPmThresholdOverFlowValue
cerentGenericPmThresholdLocation cerentGenericPmThresholdHCValue
cerentGenericPmThresholdPeriod —