What Are Meanings of Fields in the Output of the display interface Command Displaying Information on a 10GE Interface?

Created: May 25, 2018 15:57:03 319 0 0 0

Statistics about a 10GE interface are described as follows:

Statistics About Incoming Traffic

Field

Description

Cause and Solution

Unicast

Indicates the number of unicast packets.

These statistics are collected at the data link layer. This field indicates the number of the unicast packets (the lowest bit in the first byte of a MAC address is 0) that pass the check at the physical layer.

Multicast

Indicates the number of correct multicast packets.

These statistics are collected at the data link layer. This field indicates the number of the multicast MAC addresses (the lowest bit in the first byte of a MAC address is 1) that pass the check at the physical layer.

Broadcast

Indicates the number of correct broadcast packets.

These statistics are collected at the data link layer. This field indicates the number of the broadcast MAC addresses (48 bits of a MAC address are all 1s) that pass the check at the physical layer.

Jumbo

Indicates the number of jumbo Ethernet frames longer than 1518 bytes, including the Layer 2 header.

 

CRC

Indicates the number of packets whose CRC codes calculated on the receiving end are different from the CRC codes carried in the packets.

This is a type of error counting at the physical layer. CRC errors are generally caused by link quality problems, and therefore you need to check the link and optical modules on the two ends of the link.

Symbol

Indicates the number of physical decoding errors where 10-bit data cannot be converted into 8-bit data at the PHY chip.

 

Overrun

Indicates the number of packets overflowing the FIFO queue.

 

InRangeLength

Indicates the number of frames whose length does not match the actual length when the value in the length/type field ranges from 46 to 1500. When the value in the length/type field ranges from 0 to 45, statistics about this field are not collected.

 

LongPacket

Indicates the number of frames whose length is longer than the maximum frame length, without errors of other types.

 

Jabber

Indicates the number of frames whose length is longer than the maximum frame length, with CRC errors.

 

Alignment

Indicates the number of frames whose length is longer than 64 bytes but shorter than 1518 bytes, with CRC errors and alignment errors.

 

Fragment

Indicates the number of frames whose length is shorter than the minimum frame length (64 bytes, not including the 4-byte CRC field), with CRC errors.

 

Undersized Frame

Indicates the number of frames whose length is shorter than the minimum frame length (64 bytes, not including the 4-byte CRC field), without errors of other types.

 

RxPause

Indicates the number of received flow control frames, which may interrupt packet sending on an interface.

 

Statistics About Outgoing Traffic

Type

Description

Cause and Solution

Unicast

Indicates the number of unicast packets.

This is a type of packet counting at the data link layer. This field indicates the number of unicast packets (the lowest bit in the first byte of the MAC address is 0) sent to the physical layer.

Multicast

Indicates the number of multicast packets.

This is a type of packet counting at the data link layer. This field indicates the number of packets with multicast MAC addresses sent to the physical layer (that is, the lowest bit in the first byte of the MAC address is 1).

Broadcast

Indicates the number of broadcast packets.

This is a type of packet counting at the data link layer, including the number of packets with broadcast MAC addresses sent to the physical layer (that is, 48 bits of a MAC address are all 1s).

Jumbo

Indicates the number of jumbo Ethernet frames that are encapsulated with Ethernet header and longer than 1518 bytes.

 

Lost

Indicates the total number of discarded frames.

 

Overflow

Indicates the number of packets overflowing the FIFO queue.

 

Underrun

Indicates that the FIFO becomes empty before an internal End-Of-Packet indicator is read.

 

TxPause

Indicates the number of flow control frames that are sent to instruct the peer to stop sending packets.

 
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