Abstract: Systems and methods are disclosed for subscriber sampling for network packet forwarding based upon unique subscriber identifiers. Control packets within input packets are processed to identify unique subscriber identifiers and related session identifiers, which are stored in records within a tracking table. Each input packet is analyzed to extract a session identifier and a unique subscriber identifier if present within the input packet. When a unique subscriber identifier is not present, the tracking table is accessed to determine a unique subscriber identifier associated with the session identifier extracted from the packet. The input packet is sampled based upon the unique subscriber identifier to determine whether or not to output the input packet as a sampled packet. The subscriber sampling can include hash-based sampling, dynamic function based sampling, and/or other subscriber/call based sampling methods. Sampled packets are forwarded to egress port(s) for further processing.

Abstract: Systems and methods are disclosed for subscriber sampling for network packet forwarding based upon unique subscriber identifiers. Control packets within input packets are processed to identify unique subscriber identifiers and related session identifiers, which are stored in records within a tracking table. Each input packet is analyzed to extract a session identifier and a unique subscriber identifier if present within the input packet. When a unique subscriber identifier is not present, the tracking table is accessed to determine a unique subscriber identifier associated with the session identifier extracted from the packet. The input packet is sampled based upon the unique subscriber identifier to determine whether or not to output the input packet as a sampled packet. The subscriber sampling can include hash-based sampling, dynamic function based sampling, and/or other subscriber/call based sampling methods. Sampled packets are forwarded to egress port(s) for further processing.

Abstract: The subject matter described herein includes methods, systems, and computer readable media for correlating, load balancing and filtering tapped GTP and non-GTP packets. One method for correlating, load balancing and filtering tapped GTP and non-GTP packets includes receiving GTP packets tapped from a plurality of GTP network tap points. The method further includes receiving non-GTP packets tapped from at least one non-GTP network tap point. The method further includes correlating GTP packets with non-GTP packets for a particular subscriber. The method further includes forwarding the GTP packets and non-GTP packets correlated for the particular subscriber to a network monitoring tool.

Abstract: Methods, systems, and computer readable media for testing time sensitive network (TSN) elements are disclosed. According to one method for testing a TSN element, the method occurs at a test system. The method includes synchronizing a test system clock with a clock at a system under test (SUT). The method also includes receiving a sequence of messages, wherein the sequence of messages is generated using schedule rules associated with a TSN stream. The method further includes determining, using timing information associated with the test system clock, whether the schedule rules are accurately implemented by the SUT.

Abstract: A system for testing recovered clock quality includes a test device for operating as a timing synchronization protocol master for communicating with a device under test functioning as a timing synchronization protocol slave or a timing synchronization protocol boundary clock to synchronize a clock of the device under test with a clock of the test device. The system further includes a recovered clock quality tester for receiving, from the device under test, a reverse synchronization message including clock information and for using the clock information to quantify a synchronization error between the clock of the device under test and the clock of the test device.

Abstract: A method for measuring one-way link delay includes transmitting a first packet from a first network device. The first packet is passively intercepted, a first copy of the first packet is transmitted to the first network device, and a second copy of the first packet is transmitted to a second network device. A time of receipt of the first copy of the first packet is recorded as an origin timestamp at the first network device. A time of receipt of the second copy of the first packet is recorded as a receive timestamp at the second network device. A second packet including the origin timestamp is transmitted from the first network device. The second packet is passively intercepted, and a first copy of the second packet is transmitted to the second network device. The first copy of the second packet is received at the second network device, and the origin timestamp is extracted from the first copy of the second packet.

Abstract: A system for testing recovered clock quality includes a test device for operating as a timing synchronization protocol master for communicating with a device under test functioning as a timing synchronization protocol slave or a timing synchronization protocol boundary clock to synchronize a clock of the device under test with a clock of the test device. The system further includes a recovered clock quality tester for receiving, from the device under test, a reverse synchronization message including clock information and for using the clock information to quantify a synchronization error between the clock of the device under test and the clock of the test device.

Abstract: A method for measuring one-way link delay includes transmitting a first packet from a first network device. The first packet is passively intercepted, a first copy of the first packet is transmitted to the first network device, and a second copy of the first packet is transmitted to a second network device. A time of receipt of the first copy of the first packet is recorded as an origin timestamp at the first network device. A time of receipt of the second copy of the first packet is recorded as a receive timestamp at the second network device. A second packet including the origin timestamp is transmitted from the first network device. The second packet is passively intercepted, and a first copy of the second packet is transmitted to the second network device. The first copy of the second packet is received at the second network device, and the origin timestamp is extracted from the first copy of the second packet.