Techniques for testing a networked system using simulated abnormal node failure are disclosed. In some embodiments, a computer system performs operations comprising: repeatedly transmitting simulated requests to a networked system on which a software application is implemented using a plurality of nodes, the networked system being configured to respond to the simulated requests using the plurality of nodes; randomly selecting one or more nodes from the plurality of nodes; terminating the randomly selected one or more nodes; restarting the terminated randomly selected one or more nodes; repeating the randomly selecting one or more nodes, the terminating the randomly selected one or more nodes, and the restarting the terminated randomly selected one or more nodes until each one of the plurality of nodes has been terminated and restarted at least once during the first period of time; and determining response times of the networked system in responding to the simulated requests.

This application provides example detection block sending and receiving methods, and network devices and systems. One example detection block sending method includes obtaining, by a network device, an original bit block data flow. At least one detection block is generated, and the at least one detection block is inserted into a position of at least one idle block in the original bit block data flow. The bit block data flow including the at least one detection block is then sent.

This application provides example detection block sending and receiving methods, and network devices and systems. One example detection block sending method includes obtaining, by a network device, an original bit block data flow. At least one detection block is generated, and the at least one detection block is inserted into a position of at least one idle block in the original bit block data flow. The bit block data flow including the at least one detection block is then sent.

This application discloses an arbitration method and a related apparatus. The method includes: detecting, by the first ABS apparatus, first status information of a service module in the first DC; when determining that a communication link between the first DC and the second DC is faulty, obtaining, by the first ABS apparatus, second status information, wherein the second status information is status information that is of a service module in the second DC and that is detected by the second ABS apparatus; and arbitrating, by the first ABS apparatus, a subsequent service providing capability of the first DC based on the first status information and the second status information.

This application discloses an arbitration method and a related apparatus. The method includes: detecting, by the first ABS apparatus, first status information of a service module in the first DC; when determining that a communication link between the first DC and the second DC is faulty, obtaining, by the first ABS apparatus, second status information, wherein the second status information is status information that is of a service module in the second DC and that is detected by the second ABS apparatus; and arbitrating, by the first ABS apparatus, a subsequent service providing capability of the first DC based on the first status information and the second status information.

Restoration procedures in a Multimedia Broadcast Multicast Service (MBMS) network (also referred to as evolved MBMS (eMBMS) network) in case of a path failure.

Restoration procedures in a Multimedia Broadcast Multicast Service (MBMS) network (also referred to as evolved MBMS (eMBMS) network) in case of a path failure.

A method, a computer-readable medium, and a device for dynamically identifying criticality of services and data sources. The computer-readable medium comprising instructions which, when executed, cause a programmable device to: determine, based on a plurality of service-related metrics from a network node, upstream network nodes and downstream network nodes in a network; query the upstream network nodes and the downstream network nodes with a multicast request for an additional plurality of service-related metrics; extrapolate a current network topology based on the plurality of service-related metrics and the additional plurality of service-related metrics; determine whether or not an upstream backup server is present for the network node; determine a set of critical service delivery points in the network based on the determination of the upstream backup server; and generate a network service alert responsive to a service interruption from the set of critical service delivery points.

A method, a computer-readable medium, and a device for dynamically identifying criticality of services and data sources. The computer-readable medium comprising instructions which, when executed, cause a programmable device to: determine, based on a plurality of service-related metrics from a network node, upstream network nodes and downstream network nodes in a network; query the upstream network nodes and the downstream network nodes with a multicast request for an additional plurality of service-related metrics; extrapolate a current network topology based on the plurality of service-related metrics and the additional plurality of service-related metrics; determine whether or not an upstream backup server is present for the network node; determine a set of critical service delivery points in the network based on the determination of the upstream backup server; and generate a network service alert responsive to a service interruption from the set of critical service delivery points.

A communication device includes a first communication interface for a first transmission path, a second communication interface for a second transmission path, a control unit that controls a communication path internal to the communication device of a signal received by the first communication interface, and a processing unit that performs predetermined processing on the received signal, wherein the control unit performs control to output, in a case where the communication device is in a first state, the received signal to the second communication interface via the processing unit, and output, in a case where the communication device is in a second state, the received signal to the second communication interface by bypassing the processing unit.