re-initialization of the management system, and at other times as

 

 

 

 

 

indicated by the value of ifCounterDiscontinuityTime.

 

 

 

 

 

 

 

 

 

 

Excess Collisions

A count of frames for which transmission on a particular interface

 

 

 

 

Frames

fails due to excessive collisions. This counter does not increment

 

 

 

 

 

when the interface is operating in full-duplex mode.

 

 

 

 

 

Discontinuities in the value of this counter can occur at

 

 

 

 

 

re-initialization of the management system, and at other times as

 

 

 

 

 

indicated by the value of ifCounterDiscontinuityTime.

 

 

 

 

 

 

 

 

 

 

Mac Tx Errors Frames

A count of frames for which transmission on a particular interface

 

 

 

 

 

fails due to an internal MAC sublayer transmit error. A frame is

 

 

 

 

 

only counted by an instance of this object if it is not counted by

 

 

 

 

 

the corresponding instance of either the dot3StatsLateCollisions

 

 

 

 

 

object, the dot3StatsExcessiveCollisions object, or the

 

 

 

 

 

dot3StatsCarrierSenseErrors object. The precise meaning of the

 

 

 

 

 

count represented by an instance of this object is

 

 

 

 

 

implementation-specific. In particular, an instance of this object

 

 

 

 

 

may represent a count of transmission errors on a particular

 

 

 

 

 

interface that are not otherwise counted. For interfaces operating

 

 

 

 

 

at 10 Gb/s, this counter can roll over in less than 5 minutes if it is

 

 

 

 

 

incrementing at its maximum rate. Since that amount of time

 

 

 

 

 

could be less than a management station's poll cycle time, in

 

 

 

 

 

order to avoid a loss of information, a management station is

 

 

 

 

 

advised to poll the dot3HCStatsInternalMacTransmitErrors object

 

 

 

 

 

for 10 Gb/s or faster interfaces. Discontinuities in the value of this

 

 

 

 

 

counter can occur at re-initialization of the management system,

 

 

 

 

 

and at other times as indicated by the value of

 

 

 

 

 

ifCounterDiscontinuityTime.

 

 

 

 

 

 

 

 

 

 

Carrier Sense Errors

The number of times that the carrier sense condition was lost or

 

 

 

 

 

never asserted when attempting to transmit a frame on a

 

 

 

 

 

particular interface. The count represented by an instance of this

 

 

 

 

 

object is incremented at most once per transmission attempt,

 

 

 

 

 

even if the carrier sense condition fluctuates during a

 

 

 

 

 

transmission attempt. This counter does not increment when the

 

 

 

 

 

interface is operating in full-duplex mode. Discontinuities in the

 

 

 

 

 

value of this counter can occur at re-initialization of the

 

 

 

 

 

management system, and at other times as indicated by the value

 

 

 

 

 

of ifCounterDiscontinuityTime.

 

 

 

 

 

 

 

 

 

 

Too Long Frames

A count of frames received on a particular interface that exceed

 

 

 

 

 

the maximum permitted frame size. The count represented by an

 

 

 

 

 

instance of this object is incremented when the frameTooLong

 

 

 

 

 

status is returned by the MAC service to the LLC (or other MAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

316

 

 

IDL series User Guide