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10.5.1.2 History Group
The token-ring History groups capture historical information about network
utilization and error statistics for the token-ring network. They provide a means
of correlating the data collected by the Statistics group over time. They record
statistical samples according to a user-specified frequency and duration and
store them for later retrieval.
The History MIB can be used to gather separate studies collected simultaneously
from various probes and at different intervals. For instance, you can set up a
session to collect statistical data via the Statistics MIB from several probes
every 10 seconds for real-time monitoring. The History MIB can be configured to
gather statistics from the same sources at intervals of 30 seconds for an ongoing
portrait, and at 30-minute intervals for later study.
It is advisable to set up two history control entries per monitored interface upon
initialization. They can be a combination of short term polling at 30-second
intervals and long term polling at 30-minute intervals.
Each interval saved is referred to as a ″bucket″. The number of buckets to be
used is defined by the operator. The intervals over which the data is sampled
for each bucket can be set to any number of seconds from one to 3600 (one
hour).
Note
It is important to configure the appropriate time interval for sampling the
statistical data as no indication will be given when the statistical counters
overflow their maximum value. For instance, on a heavily-loaded token-ring
segment, the
tokenRingMLHistoryMacOctets
counter could overflow in a
short time. Following this, the information stored in this counter will not
reflect a correct value. Once the maximum value is reached it will reset to
zero and begin incrementing again.
The History groups are broken down into two sub-groups (similar to the
token-ring Statistics groups):
•
MAC-Layer History group
•
Promiscuous History group
MAC-Layer History Group:
The token-ring MAC-Layer History group will collect
and store the MAC-layer statistics based on user-defined frequency and
duration. This group contains a total of 24 different counters for collecting and
storing the following MAC-layer statistics:
•
Drop Events
•
Mac Octets
•
Mac Packets
•
Ring Purge Events
•
Ring Purge Packets
•
Beacon Events
•
Beacon Time
•
Beacon Packets
•
Claim Token Events
•
Claim Token Packets
•
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