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FAQ-What Do the Statistics on GE and POS Interfaces of a Router Mean

Publication Date:  2012-07-27 Views:  38 Downloads:  0
Issue Description
Q:
What do the statistics on GE and POS interfaces obtained using the dis interface command mean and what are the possible causes? For details, see the appendix. 
 
Alarm Information
Null
Handling Process
  

A:

GE Interface Statistics

Description

Possible Cause.

Receiving direction:

 

 

Unicast

Unicast packet

Normal packet.

Multicast

Multicast packet

Normal packet.

Broadcast

Broadcast packet

Normal packet.

JumboOctets

Normal packet containing over 1518 bytes

Normal packet.

CRC

CRC error packet

1. The CRC configurations are different at both ends.

2. The link or the connector breaks down.

Symbol

Symbol packet

The link or the connector breaks down.

Overrun

Count of uplink overrun packets

The uplink traffic exceeds the line speed, causing overrun packets.

InRangeLength

Count of packet errors in the length field

The packet itself is incorrect.

The link or the connector breaks down.

LongPacket

Extra long packet

The link breaks down or extra long packets exist on the link.

Jabber

Packet with over 10240 bytes and CRC errors

The link or the connector breaks down.

Alignment

Alignment error

The link or the connector breaks down.

Fragment

Packet containing less than 64 bytes and CRC errors

The link or the connector breaks down.

Undersized Frame

Packet containing less than 64 bytes and correct CRC

Undersized frames exist on the link.

RxPause

Pause frame received

The remote end sends Pause frames.

 

 

 

Sending direction:

 

 

Unicast

Unicast packet

Normal packet.

Multicast

Multicast packet

Normal packet.

Broadcast

Broadcast packet

Normal packet.

JumboOctets

Normal packet containing over 1518 bytes

Normal packet.

Lost

Discarded packet

Packets are discarded due to the hardware problem.

Overflow

Number of lost packets caused by overflowing downlink FIFO

The downlink traffic is heavy, causing outgoing congestion.

Underrun

Number of lost packets caused by downlink FIFO underrun

Incomplete packets are sent due to the downlink FIFO underrun.

TxPause

Pause frame sent

The local device sends the Pause frame to the remote end when it is incapable of processing the uplink traffic that is too heavy.

Unknown Vlan

Unused

Unused.

 

 

 

POS Interface Statistics

Description

Possible Cause

Receiving direction:

 

 

B1

Bit errors in the Regenerator Section

The transmission device or the link works abnormally.

B2

Bit errors in the Multiplex Section

The transmission device or the link works abnormally.

B3

Bit errors in the higher order path

The transmission device or the link works abnormally.

shortpacket

Count of extra short packet errors

1. The link works abnormally.

2. Scrambling codes are inconsistent between both ends.

longpacket

Count of extra long packet errors

1. The link works abnormally.

2. Scrambling codes are inconsistent between both ends.

CRC:

Count of FCS error packets received

1. The CRC configurations are different at both ends.

2. The link or the connector breaks down.

lostpacket

Discarded packet

The local device discards the packets that are received from the remote end, labeled with Abort.

 

 

 

Sending direction:

 

 

lostpackets

Packet that is sent by the local device, labeled with Abort

The local device working abnormally or the overflow traffic causes packet errors. Because the packets are labeled with Abort, the remote end discards them.

overrunpackets

Count of overrun packets sent, namely, the number of packets discarded due to the downlink FIFO overruns

The local device working abnormally or the overflow traffic causes packet errors. Because the packets are labeled with Abort, the remote end discards them.

underrunpackets

Count of underflow packets sent, namely, the number of packets discarded due to the downstream FIFO underflow

Incomplete packets are sent due to the downlink FIFO underrun.

 
Root Cause
Null
Suggestions
Null

END