System information

Monitoring the Switch

2-47

Displaying Port Statistics

Port Statistics display key statistics from the Ethernet-like MIB for each port. Error

statistics on the traffic passing through each port are displayed. This information can

be used to identify potential problems with the switch (such as a faulty port or

unusually heavy loading). The values displayed have been accumulated since the

last system reboot.

Select the required port. The statistics displayed are indicated in the following figure

and table.

Port Statistics : Unit 1 Port 1

===============

Ether Like Counter :

Alignment Errors : 0 Late Collisions : 0

FCS Errors : 0 Excessive Collisions : 0

Single Collision Frames : 0 Internal Mac Transmit Errors: 0

Multiple Collision Frames: 0 Carrier Sense Errors : 0

SQE Test Errors : 0 Frame Too Longs : 0

Deferred Transmissions : 0 Internal Mac Receive Errors : 0

[Refresh Statistics] Show port : 1

[Reset Counters] [Show]

Use <TAB> or arrow keys to move. <Enter> to select

Menu Description

FCS Errors The number of frames received that are an integral number of octets in length

but do not pass the FCS check.

Single Collision Frames* The number of successfully transmitted frames for which transmission is

inhibited by exactly one collision.

Multiple Collision Frames* A count of successfully transmitted frames for which transmission is inhibited

by more than one collision.

SQE Test Errors* A count of times that the SQE TEST ERROR message is generated by the

PLS sublayer.

Deferred Transmissions* A count of frames for which the first transmission attempt on a particular

interface is delayed because the medium was busy.

Late Collisions The number of times that a collision is detected later than 512 bit-times into

the transmission of a packet.

Excessive Collisions* The number of frames for which transmission failed due to excessive

collisions.

Internal Mac Transmit Errors* The number of frames for which transmission failed due to an internal MAC

sublayer transmit error.

Carrier Sense Errors* The number of times that the carrier sense condition was lost or never

asserted when attempting to transmit a frame.

Frames Too Long The number of frames received that exceed the maximum permitted frame

size.