Active/standby switching method system control unit and communication system

A system control unit, wherein the system control unit is in a frame, comprising:

• a detection packet sending module, configured to send, according to a set detection cycle, a detection packet to a peer network element via a transmission link connected between the system control unit where the detection packet sending module is located and the peer network element, wherein the detection packet is used for indicating a transmission link state;
• an active/standby link switching module, configured to, when receiving an active/standby switching instruction, stop sending the detection packet via the transmission link connected between the system control unit and the peer network element, so that transmission link switching is triggered when the system control unit stops sending the detection packet in a set timeout period, so as to switch from the transmission link connected between the system control unit and the peer network element to a transmission link connected between another system control unit in the frame and the peer network element for data transmission, and simultaneously start a switching timer for the system control unit where the active/standby link switching module is located;
• and
• a reset module, configured to, when it is detected that a value of the switching timer reaches a switching timing value, perform a reset operation on the system control unit where the reset module is located to complete active/standby switching, wherein the switching timing value is greater than the timeout period.

A no-transitory computer-readable medium having computer executable instructions for performing a method comprising:

• sending, by a first system control unit, according to a set detection cycle, a detection packet to a peer network element via a transmission link connected between the first system control unit and the peer network element, wherein the detection packet is used for indicating a transmission link state, wherein the first system control unit is in a frame;
• when the first system control unit receives an active/standby switching instruction, stopping sending the detection packet via the transmission link connected between the first system control unit and the peer network element, so that transmission link switching is triggered when the first system control unit stops sending the detection packet in a set timeout period, so as to switch to a transmission link between the peer network element and a second system control unit in the frame for data transmission, and simultaneously starting, by the first system control unit, a switching timer;
• and
• when the first system control unit detects that a value of the switching timer reaches a switching timing value, performing, by the first system control unit, a reset operation to complete the active/standby switching, wherein the switching timing value is greater than the timeout period.