Got it

Q&A: CloudEngine - After a CE Switch Connects to an H3C Switch Through Link Aggregation, They Cannot Learn the MAC Address of Each Other

Latest reply: Dec 24, 2018 01:30:47 638 1 1 0 0

Problem Description

A CE switch connects to an H3C switch through three cables, a link aggregation group (LAG) is created on each of them, and three connected interfaces are added to the LAG at each end. After the configuration is complete, two devices cannot communicate or learn the MAC address of each other.

Root Cause

Run the display interface eth-trunk command to check the LAG status. The status of each physical interface is Up but the Eth-Trunk status is Down, the protocol configuration on both devices may be inconsistent.

For a CE switch, link aggregation can work in manual load balancing mode or LACP mode. By default, link aggregation works in manual load balancing mode. That is, the LACP mode is disabled.

Check the configuration of both devices. The H3C switch uses the dynamic aggregation mode. In this mode, all member interfaces in the group are enabled with LACP. The CE switch uses the manual load balancing mode by default. That is, LACP is disabled. The preceding problem is caused by the incorrect protocol configuration of two devices.


Run the mode lacp-static command in the Eth-Trunk interface view of the CE switch to change the link aggregation mode to static LACP.

  • x
  • convention:

Created Dec 24, 2018 01:30:47

That's what I need
View more
  • x
  • convention:


You need to log in to comment to the post Login | Register

Notice: To protect the legitimate rights and interests of you, the community, and third parties, do not release content that may bring legal risks to all parties, including but are not limited to the following:
  • Politically sensitive content
  • Content concerning pornography, gambling, and drug abuse
  • Content that may disclose or infringe upon others ' commercial secrets, intellectual properties, including trade marks, copyrights, and patents, and personal privacy
Do not share your account and password with others. All operations performed using your account will be regarded as your own actions and all consequences arising therefrom will be borne by you. For details, see " User Agreement."

My Followers

Login and enjoy all the member benefits


Are you sure to block this user?
Users on your blacklist cannot comment on your post,cannot mention you, cannot send you private messages.
Please bind your phone number to obtain invitation bonus.
Information Protection Guide
Thanks for using Huawei Enterprise Support Community! We will help you learn how we collect, use, store and share your personal information and the rights you have in accordance with Privacy Policy and User Agreement.