Huawei Exam H12-321 Topic 9 Question 65 Discussion

After the dual-link is established, the AP performs Echo detection on the active and standby ACs and carries the active and standby information of the link in the Echo packet. After the AP detects the interruption of the primary link, the AP carries the primary information in the Echo Request message sent to the standby AC. After receiving the Echo Request message, the standby AC determines that the link has become the primary state and prepares itself. The AC switches to the primary AC, and the AP sends the STA's data service to the new primary AC.