CHAPTER6 Performance Monitoring
Mediant 800 SBC | SNMP Reference Guide
● Trunk activity
● Number of channels that are in/out of service and in maintenance
■ acPMSystem: General device monitoring:
● IP connection.
● Discarded UDP packets due to unknown port
● System Net Utils subtree – transmitted/received bytes/packets, discarded packets
● System Network subtree – DHCP response time/request count and STUN-related
statistics
● System Multicast subtree – multicast IP packets received, multicast IP packets
conveying UDP payload packets received/rejected, IGMP packets/general-
queries/specific-queries received, IGMP membership-report/leave-group sent
messages
● System Congestion subtree – congestion state for general resources, DSP resources,
IP resources, conference resources
● System NFS subtree – NFS-related parameters
Performance monitoring MIBs all have an identical, fixed structure, which includes two major
subtrees:
■ Configuration subtree: Allows configuration of general attributes of the MIB and specific
attributes of the monitored objects. This subtree includes:
● Reset Total Counters: Resets the "total" (see below) objects in all the MIB’s tables, if
they are defined.
● Attributes subtrees: Number of subtrees in which scalars are used to configure high
and low thresholds for relevant tables.
■ Data subtree: Consists of monitored data and statistics, and includes:
● Time From Start Of Interval object: GETs the time in seconds from the beginning of the
current interval.
● Data tables: All have similar structure. Not all possible columns appear in all of them.
The specific structure of a table (i.e. what columns are defined) is parameter specific.
The only column that always appears is the interval column. The information in each
column is a statistical attribute of the parameter being measured.
The device measures performance at fixed intervals of 15 minutes. The device keeps a record
of the last two completed intervals. These intervals are used as a key in the MIB tables in which
the performance monitoring results are presented. There are one or two indices in each table.
If there are two, the first is a sub-set in the table (e.g., trunk number) and the second (or the
single where there is only one) index represents the interval number:
■ 0: Current interval (not completed)
■ 1: Last completed interval
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