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 doesnt 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

 

doesnt 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

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IBM 8260 manual Drop Event, MAC Octet, MAC Packet, Ring Purge Event, Ring Purge Packet, Beacon Event

8260 specifications

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