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Troubleshooting Guide

CloudEngine 16800, 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Packet Loss Occurs on An Interface

Packet Loss Occurs on An Interface

Fault Description

Packet loss occurs when packets are transmitted on an interface.

Common Causes

  • Physical connection fails because the ethernet cable connector is loose or in bad contact.
  • The length of packets sent from the remote device is too small.
  • The length of packets sent from the remote device is too large.

Troubleshooting Procedure

Run the display interface [ interface-type [ interface-number ] ] command to check packet statistics on the interface where packet loss occurs and determine the type of the lost packets.

  • If crc error packets are lost and the percentage of the number of crc error packets against the total number of packets is small, check whether the cable connector is loose or the physical line is damaged. If so, tighten the connector or replace the transmission medium such as the optical fiber, high-speed cable, optical module, or ethernet cable. Run the restart command in the interface view to restart the interface.
  • If runts packets are lost, check the length of packets received by the local interface.
    • If the length of the received packets is smaller than 64 bytes, check whether the length of the packets sent by the remote device is correct. If the length of the packets sent by the remote device is incorrect, modify configurations on the remote device.
    • If the length of the packets sent by the remote device is correct (the packet length is greater than or equal to 64 bytes), run the restart command to restart the local interface.
  • If giants packets are lost, check the length of packets received by the local interface. Run the display interface [ interface-type [ interface-number ] ] command to check the value of The Maximum Frame Length which indicates the maximum length of packets allowed by the interface. Then compare the length of the received packets and the value of The Maximum Frame Length.
    • If the length of the received packets is larger than The Maximum Frame Length but less than the maximum frame length allowed by the interface, run the jumboframe enable value1 command to increase the length of packets allowed by the interface to a value larger than or equal to the length of the received packets.
    • If the length of the received packets is larger than the maximum frame length allowed by the interface (the packet length is larger than the maximum length configured using the jumboframe enable value1 command), run the mtu mtu command on the remote device to reduce the MTU of the remote interface to a value less than or equal to the value of The Maximum Frame Length.
  • If discard packets are lost, check whether traffic shaping for an interface queue is configured on the outbound interface and whether the rate of the outbound interface is smaller than the traffic bandwidth.

    For example, if packets received by 10GE1/0/1 are forwarded through 10GE1/0/2, and traffic shaping for a specified interface queue is configured on 10GE1/0/2 or the rate of 10GE1/0/2 is smaller than the traffic bandwidth, some packets cannot be forwarded. As a result, packets are discarded and packet loss occurs on 10GE1/0/1.

    • If traffic shaping for a specified interface queue is configured on the outbound interface, run the qos queue queue-index shaping cir cir-value [ kbps | mbps | gbps ] pir pir-value [ kbps | mbps | gbps ] [ cbs cbs-value [ bytes | kbytes | mbytes ] pbs pbs-value [ bytes | kbytes | mbytes ] ] command to modify traffic shaping parameters.
    • If the rate of the outbound interface is smaller than the traffic bandwidth, increase the interface rate or available bandwidth using the following methods:
      • When the current or negotiated interface rate does not reach the maximum, run the speed { 10 | 100 | 1000 } or speed { 100 | 1000 | 10000 } command to configure a higher rate.
      • Replace the interface with the one with a higher rate, for example, replace a GE interface with a 10GE interface.
      • Use link aggregation to bind multiple physical interfaces to a logical interface to increase the bandwidth.
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Updated: 2020-01-07

Document ID: EDOC1000060766

Views: 613393

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