IBM 8260 manual Frequency Error, Token Error, Soft Error Report, Ring Poll Event

Frequency Error	Occurs when a ring station detects a frequency error.
	A new station inserting into the ring can cause
	downstream stations to be ″off frequency″. This
	condition seems to happen more on 16 Mbps than 4
	Mbps rings. This statistic is found in the total number
	of Frequency errors reported in the Soft Error Report
	MAC frame.
Token Error	Token errors occur when a token is destroyed or
	corrupted. This usually occurs when devices insert or
	remove themselves from the ring. This statistic is
	found in the total number of token errors reported in
	the Soft Error Report MAC frame.
Soft Error Report	The Soft Error Report contains a compilation of all soft
	errors detected by a ring station. At every two-second
	interval, each ring station will transmit a Soft Error
	Report MAC frame to the ring error monitor if the
	counters are greater than zero. This enables the ring
	error monitor to maintain accurate error statistics. A
	soft error refers to an intermittent network error that
	causes data to be retransmitted. If the number of soft
	errors becomes excessive, network reliability and
	performance can be seriously impacted.
Ring Poll Event	A Ring Poll event is triggered by the occurrence of an
	Active Monitor Present MAC frame. It is initiated by
	the active monitor to all ring stations to:
	∙ Inform standby monitors of the active monitor′ s
	presence

∙

∙

Indicate that the ring is functioning correctly

Initiate a neighbor notification (NAUN)

The Token-Ring Promiscuous Statistics Group: This group gathers current utilization statistics from non-MAC packets on a particular token-ring interface. The statistics like data packets, data octets, broadcast packets, multicast packets, packet size, etc., are collected promiscuously. In other words, the device driver for the token-ring adapter must be enabled to deliberately copy all non-MAC packets even though they are not addressed to it.

Here is a list of statistics available under this group and their respective descriptions:

Drop Event	The number of events in which non-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,

206 8260 Multiprotocol Intelligent Switching Hub