TABLE 3-43Traffic Statistics (Continued)

Statistic

Description

 

 

Transmit Discarded Packets The number of outbound packets which were chosen to be discarded even though no errors had been detected to prevent their being transmitted. One possible reason for discarding such a packet could be to free up buffer space.

• Transmit Errors

The number of outbound packets that could not be

 

transmitted because of errors.

Ether-like Statistics

 

• Alignment Errors

The number of alignment errors (missynchronized data

 

packets).

• Late Collisions

The number of times that a collision is detected later than 512

 

bit-times into the transmission of a packet.

• FCS Errors

A count of frames received on a particular interface that are

 

an integral number of octets in length but do not pass the FCS

 

check. This count does not include frames received with

 

frame-too-long or frame-too-short error.

• Excessive Collisions

A count of frames for which transmission on a particular

 

interface fails due to excessive collisions. This counter does

 

not increment when the interface is operating in full-duplex

 

mode.

• Single Collision Frames

The number of successfully transmitted frames for which

 

transmission is inhibited by exactly one collision.

• Internal MAC Transmit

A count of frames for which transmission on a particular

Errors

interface fails due to an internal MAC sublayer transmit error.

• Multiple Collision Frames

A count of successfully transmitted frames for which

 

transmission is inhibited by more than one collision.

• Carrier Sense Errors

The number of times that the carrier sense condition was lost

 

or never asserted when attempting to transmit a frame.

• SQE Test Errors

A count of times that the SQE TEST ERROR message is

 

generated by the PLS sublayer for a particular interface.

• Frames Too Long

A count of frames received on a particular interface that

 

exceed the maximum permitted frame size.

• Deferred Transmissions

A count of frames for which the first transmission attempt on

 

a particular interface is delayed because the medium was

 

busy.

• Internal MAC Receive

A count of frames for which reception on a particular

Errors

interface fails due to an internal MAC sublayer receive error.

 

 

Chapter 3 General Management of the Switch 3-143

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Sunfire B1600 manual 43Traffic Statistics