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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).
How Is the Problem of Uneven Load Balancing of an Eth-Trunk Solved?

How Is the Problem of Uneven Load Balancing of an Eth-Trunk Solved?

Load balancing modes in different service scenarios are different. When Eth-Trunk load balancing is uneven, use the following methods to solve the problem:
  1. Disable preferential forwarding of local traffic.

    Run the local-preference disable command to disable preferential forwarding of local traffic in scenarios where the inter-chassis stack or Eth-Trunk is deployed and unicast traffic is unevenly load balanced.

  2. Check whether the number of Eth-Trunk member interfaces is the nth power of 2.

    If the number of Eth-Trunk member interfaces is not the nth power of 2, adjust the number of Eth-Trunk member interfaces.

  3. Adjust the load balancing mode.

    • If the IP address in packets changes frequently, use load balancing based on the source or destination IP address so that traffic can be evenly load balanced among physical links.
    • If the MAC address in packets changes frequently and the IP address is fixed, use load balancing based on the source or destination MAC address so that traffic can be evenly load balanced among physical links.
    • If packets are random, you are advised to add the hash factor.
  4. Adjust the hash algorithm.
    • CE12800E that has the FD-X series cards installed, CE8800, CE7800, CE6800, and CE5800 (excluding the CE5880EI, CE6870EI, CE6875EI and CE6880EI): eth-trunk { hash-mode hash-mode-id | universal-id universal-id } *
    • CE6870EI, CE6875EI and CE12800: eth-trunk { src-interface | seed seed-data | universal-id universal-id | hash-mode hash-mode-id } *
    • CE5880EI, CE6880EI, CE16800 and CE12800E that have the ED-E/EG-E/EGA-E series cards installed: eth-trunk universal-id universal-id

The load balancing mode is only valid for the outbound interface of traffic. In multi-level load balancing scenarios, if traffic of the inbound interface is uneven, change the load balancing mode of the outbound interface on the uplink device.

In the scenario where Eth-Trunk and ECMP are deployed and traffic is unevenly load balanced, configure different hash algorithms for the Eth-Trunk and ECMP and change the value of universal-id as needed.

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Updated: 2020-01-07

Document ID: EDOC1000060766

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