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Here is a list of MAC statistics available under this group and their respective
descriptions:
Drop Event The number of events in which MAC packets were
dropped by the probe due to unavailability of
resources on the probe itself. It doesn′t represent the
number of packets dropped but the number of times
this condition was detected. If the drop events counter
constantly increments, it is an indication that there is
more activity on the segment than can be captured by
the network probe. You may want to consider
increasing the resources on your network probe. For
instance, if you are running the RMON application on
a workstation, you may want to allocate more real
memory and disk space to the RMON application. If
you are running an RMON subset on a bridge, router,
or hub, you might want to consider offloading the task
to an external monitoring device.
MAC Octet The number of octets of data in MAC packets
(excluding bad frames) received on the network
(including the FCS octets but excluding the framing
bits). An octet represents an integral collection of
eight bits of information.
MAC Packet The number of MAC packets received. This excludes
packets that were not good frames.
Ring Purge Event A ring purge event refers to one of the following
occurrences:
•
Completion of the token-claiming process
•
Detection of a token error such as a lost frame or
token, a circulating frame, or a circulating priority
token
The probe will count the number of times the ring
enters the ring purge state from normal ring state. It
doesn′t include a ring purge state that comes in
response to the claim token or beacon state.
Errors caused by adapter insert/removal can also
trigger a ring purge. Adapter insert/removal
operations are normally encountered in the morning
when employees power-on their PCs to access the
LAN and when they power-off their PCs in the evening.
A baseline should be set to ignore high counts of ring
purges during hours when PCs are being
powered-on/off.
Ring Purge Packet A Ring Purge MAC frame/packet is sent by the active
monitor to all ring stations informing them about the
occurrence of a ring purge event.
Beacon Event This counter keeps track of beacon events. A beacon
event occurs when the ring enters the beaconing state
from a non-beaconing state. A beaconing state could
result from:
•
Ring signal loss error
Chapter 10. 8260 RMON Support 203