Fast Ethernet interface statistics

RECEIVE section statistics

The following table describes the statistics in the RECEIVE section of the ifstat command output when you use the command on a Fast Ethernet interface, such as an X1001C or X1012C card.

Statistic	Meaning
Frames/second	Rate of received frames per second.
Bytes/second	Rate of received bytes per second.
Errors/minute	Rate of errors (which led to frames being lost) per minute.
Total frames	Total frames that are received on the interface.
Total bytes	Total bytes that are received on the interface.
Total errors	Total errors that occur on the interface.
Multi/broadcast	Total number of multicast or broadcast packets received.
CRC errors	Number of CRC errors that occurred on the received packets due mainly to duplex mismatches.
Alignment errors	Number of frames that are both misaligned and contain CRC errors.
Non-primary u/c	Number of Ethernet frames received for the partner's MAC address after a failover in a cluster configuration.
No buffers	Number of times the driver was unable to get a buffer from its buffer pool because the pool was empty.
Tag drop	Number of tagged frames dropped on an interface that is not configured to support VLAN tagging and receives tagged frames.
Vlan tag drop	Number of tagged frames received and dropped that do not match the tags configured on an interface configured to support VLAN tagging.
Vlan untag drop	Number of untagged frames dropped on an interface that is configured to be part of a VLAN.
List overflow	Number of frames dropped due to the unavailability of receive resources.
Bus overruns	Number of frames lost due to receive FIFO overflows.
Runt frames	Number of runt frames received.
Long frames	Number of long frames received that exceeded the maximum Ethernet-specified size of 1,518 bytes.
Flow controls	Number of flow control frames received.

TRANSMIT section statistics

The following table describes the statistics in the TRANSMIT section of the ifstat command output when you use the command on a Fast Ethernet interface.

Statistic	Meaning
Frames/second	Rate of transmitted frames per second.
Bytes/second	Rate of transmitted bytes per second.
Errors/minute	Rate of errors (which led to frames being lost) per minute.
Total frames	Total frames that are transmitted on the interface.
Total bytes	Total bytes that are transmitted on the interface.
Total errors	Total errors that occur on the interface.
Multi/broadcast	Total number of multicast or broadcast packets transmitted.
Queue overflows	Total number of frames dropped due to software queue overflow.
Max collisions	Total number of frames that were not transmitted because they encountered the maximum number of allowed collisions.
Late collisions	Number of frames that were not transmitted because they encountered a collision outside the collision window.
Bus underruns	Number of times the transmitter aborted the frame to be transmitted because data arrived late from memory. These packets are retransmitted later.
Lost carriers	Number of frames that were transmitted by the device despite the deassertion of CRS during transmission.
Deferred	Number of frames that were deferred before transmission due to activity on the link.
Single collision	Number of transmitted frames that encountered one and only one collision.
Multiple collision	Number of transmitted frames that encountered more than one collision, but fewer than the maximum allowed collisions.
Flow controls	Number of flow control frames transmitted.

LINK INFO section statistics

The following table describes the statistics in the LINK INFO section of the ifstat command output when you use the command on a Fast Ethernet interface.

Statistic	Meaning
Current state	The state of the link. It can be up, down, or enabling.
Up to downs	Number of times the link toggled between LINK_UP and LINK_DOWN states.
Speed	Current negotiated speed.
Duplex	Duplex of the link negotiated or set.
Flow control	Negotiated value of flow control if the interface is autonegotiable; otherwise, it is the configured setting.