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Fragments Fragments are similar to CRC Align Error packets with
the exception that each fragmented packet is less than
64 octets in length. This can indicate a high collision
rate.
Collisions The number of collisions detected on the network.
Collisions are common phenomena on Ethernet
segments. Excessive collisions are detrimental to
network performance. It is an indication that you have
too many stations trying to communicate
simultaneously. If the situation persists, perhaps it′s
time to consider further segmenting of your network.
Packet Size Statistics The probe keeps individual counters for the
occurrences of packets with the following lengths:
•
64 octets
•
65-127 octets
•
128-255 octets
•
256-511 octets
•
512-1023 octets
•
1024-1518 octets
10.4.1.2 History Group
The History group provides a means of correlating the data gathered by the
Statistics MIB over time. It records statistical samples according to a
user-specified time interval and duration and stores 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.
You are encouraged to set up two history control entries per monitored interface
upon initialization. One can be set for short term polling at intervals of 30
seconds and another for 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 interval can range from one second to one
hour.
Note
It is important to configure the appropriate time interval for data sampling as
no indication will be given when the statistical counters overflow their
maximum value. For instance, on a heavily-loaded Ethernet segment, the
etherHistoryOctets
counter could overflow in about an hour. Following this,
the information stored by this counter will not reflect the true state as it will
reset to zero and start incrementing again. The maximum counter value of
the RMON agent varies according to implementation and hardware
architecture. On the RMONitor Agent for OS/2 device, the maximum counter
value is 2
32
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198 8260 Multiprotocol Intelligent Switching Hub