Third-Party Performance Monitoring Measurements - 3Com VCX v7111 User Manual

Third-Party Performance Monitoring Measurements

Performance measurements are available for a third-party performance monitoring system
through an SNMP interface. These measurements can be polled at scheduled intervals by
an external poller or utility in a media server or other off-device system.
The device provides two types of performance measurements:
Gauges: Gauges represent the current state of activities on the device. Gauges, unlike
counters, can decrease in value, and like counters, can increase. The value of a gauge is
the current value or a snapshot of the current activity on the device.
Counters: Counters always increase in value and are cumulative. Counters, unlike
gauges, never decrease in value unless the off-device system is reset, the counters are
then zeroed.
Performance measurements are provided by several proprietary MIBs that are located under
the performance sub tree:
iso(1).org(3).dod(6).internet(1).private(4).enterprises(1).3Com(5003).acPerformance(10).
Two formats of performance monitoring MIBs are available:
Old format (obsolete as of version 4.6):
Each MIB is composed of a list of single MIB objects, each relates to a separate attribute
within a gauge or a counter. All counters and gauges provide the current time value only.
acPerfMediaGateway
Control protocol
RTP stream
System packets statistics
acPerfMediaServices
acPerfH323SIPGateway – holds statistics on Tel to IP and vice versa.
New format:
The following MIBs feature an identical structure. Each includes two major sub-trees.
Configuration sub tree – enables configuration of general attributes of the MIB and
specific attributes of the monitored objects.
Data sub tree
The monitoring results are presented in tables. Each table includes one or two indices. When
there are two indices, the first index is a sub-set in the table (for example, trunk number) and
the second (or a single where there is only one) index represents the interval number
(present - 0, previous - 1 and the one before - 2).
®
3Com VCX V7111 VoIP Gateway User Guide
- a generic-type of PM MIB that covers:
- Media services devices specific performance MIB.
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