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On the maintenance of the link status of the active and standby channels, you can prevent the TCP from being interrupted for a long time, but the protocol stack does not detect the connection interruption. You can prevent this by sending the primary and backup service packets and retransmission.
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.
After setting up tunnels with the active and standby ACs, the AP sends Echo messages to monitor tunnel status. The Echo messages contain the active/standby status of the tunnels. When the AP detects that the primary tunnel fails, it sends an Echo Request message with the active flag to the standby AC. After receiving the Echo Request message, the standby AC becomes the active AC, and the AP sends STA data to this AC.
