Abstract: A source node for addressing target nodes (44, 46) in a communication system (10), the source node configured to be part of an Ethernet domain (20) and the target nodes (44, 46) configured to be part of a Multiple Protocol Label Switching (MPLS) domain (40) that is connected to the Ethernet domain (20) via an interworking node (30). The source node is further configured to: i) generate a message (51) comprising an identifier of the source node, an identifier of the interworking node (30), and an identifier of a certain target node (44) of the target nodes (44, 46), ii) send the message (51) to the certain target node (44) via the interworking node (30), and iii) receive from the certain target node (44) via interworking node (30) a reply (54) to the message (51). An alternate source node, related interworking nodes and methods are also described.

Abstract: In accordance with embodiments of the present disclosure, a method may include designating one of at least one maintenance point associated with a physical port of a line card as a primary maintenance point, the primary maintenance point comprising either a UP-Maintenance Entity Group End Point (UP-MEP) or one Maintenance Entity Group Intermediate Point (MIP). The method may also include configuring the line card such that the line card stores source addresses of Service Operation, Administration, and Management (SOAM) frames communicated by the primary maintenance point. The method may further include configuring the line card such that the line card does not store source addresses of Service Operation, Administration, and Management frames communicated by maintenance points associated with the physical port other than the primary maintenance point.

Abstract: A first network element that is to be coupled with a second network element over a first network in the same domain is described. The first network element includes a connectivity check detection module and a connectivity check fault state change module. The connectivity check detection module detects, according to a first protocol, a connectivity status of a local maintenance endpoint on a second network changing between not active and active. The connectivity check fault state change module creates and sends a first fault state change message, according to a second protocol, in response to the connectivity status of the local maintenance endpoint changing from not active to active instead of forwarding connectivity check messages periodically received by the first network element to a remote maintenance endpoint coupled to the second network element over a third network.

Abstract: A method for operation and maintenance of Access Points in a wireless communications network, and a network node and an access point for use in such a network. Access points are used for connecting wireless networks to core networks. The method comprises the step of first receiving, at a network node, an on-demand triggered request for status information, wherein the request includes an access point identity. The network node investigates, using the received access point identity, if the access point is registered. If the access point is registered, then the network node uses the access point identity to retrieve access point address information. The network node uses the retrieved address information to establish a connection with the access point. Thereafter the network node receives access point status information.

Abstract: A method implemented by a network element monitor OpenFlow data flows and enable operations, administration and management (OAM) functionality in OpenFlow. The method inserts OpenFlow OAM packets into an OpenFlow data flow to monitor the OpenFlow data flow, wherein inserted OpenFlow OAM packets have fate sharing with data packets in the OpenFlow data flow. The method comprises the steps of receiving by the network element the OpenFlow OAM packets from a source through a port of the network element, matching by an OpenFlow switch module using a matching structure of OpenFlow data packets received by the network element to identify the OpenFlow OAM packets, and forwarding the identified OpenFlow OAM packets to a flow table or group table of the OpenFlow switch module to aggregate the OpenFlow OAM packets with a corresponding OpenFlow data flow.

Abstract: A method of measuring loss in a multicast transmission in a network is described. Service frames including a service multicast destination address are sent from a source node towards a receiving node. A counter of the number of service frames sent is maintained at the source node. This counter is periodically read, and its value copied into a loss measurement OAM frame. The loss measurement OAM frame includes a unique identifier and an OAM destination address which is different to the service multicast destination address, and is sent from the source node towards the receiving node. Every time the sent frames counter is read, a measurement indicator frame is also sent from the source node towards the receiving node. The measurement indicator frame includes the unique identifier so that it can be related to the loss measurement OAM frame. The measurement indicator frame also includes the service multicast destination address, although the measurement indicator frame is distinguishable from the service frames.

Abstract: A method for performing radio usage measurements to support radio link operations and/or load balancing may be performed at an evolved Node B (eNB). The method may include determining a first radio usage parameter. The first radio usage parameter may be a measurement of radio usage between an eNB and at least one wireless transmit receive unit (WTRU). The method may further include determining a second radio usage parameter. The second radio usage parameter may be a measurement of radio usage between the eNB and at least one relay node (RN) served by the eNB. The method may further include utilizing at least one of the first radio usage parameter or the second radio usage parameter to evaluate at least one of evolved universal terrestrial radio access (E-UTRA) radio link operations, radio resource management (RRM), network operations and maintenance (OAM), and self-organizing networks (SON) functions or functionalities.

Abstract: Described are methods and communications network for carrying pseudowires over packet-switched network. A communication network includes a packet-switched network (PSN), a first provider edge (PE) device in communication with a second PE device through the PSN, and a pseudowire (PW) established between the PE devices for emulating a service across the PSN. The PW has a Virtual Circuit Connection Verification (VCCV) control channel that carries an Ethernet Operations, Administration, and Maintenance (OAM) message. In some embodiments, various data plane encapsulation formats enable a PW to emulate an Ethernet or a non-Ethernet service over an Ethernet PSN. Each encapsulation format includes an Ethernet tunnel header and a PW header that encapsulates an Ethernet or non-Ethernet payload.

Abstract: A communication system for propagating time division multiplexing (TDM) fault notifications has a first interworking function (IWF) of a packet network and a second IWF of the packet network. The second IWF detects a TDM fault of a TDM network and transmits continuity check messages (CCMs) to the first IWF. Further, the second IWF controls the CCMs in response to a detection of the TDM fault such that a TDM fault notification is propagated from the second IWF to the first IWF based on the CCMs, and the first IWF propagates the TDM fault notification to a second TDM node via a TDM signal.

Abstract: A routing control method includes learning a route of receiving a first packet, which first packet has identification information attached thereto, only for the first packet having first arrived among a plurality of first packets that have identification information common to that of the first packet, which route is applied for transmitting a second packet having the same identification information as that of the first packet; and transmitting the first packet, wherein transmitting the first packet is done in a controlled manner depending on a condition of the first packet, wherein the controlled manner of transmitting the first packet includes controlling timing of the transmitting the first packet.

Abstract: A method and a system for Internet Protocol (IP) session keepalive monitoring, a home gateway and a network device are provided. The method includes: receiving, by a User Equipment (UE) or an IP edge node, a Bidirectional Forwarding Detection (BFD) message sent by a Home Gateway (HGW), in which a first discriminator field value included in the BFD message is a difference between an IP address prefix of the UE and an IP address prefix of the HGW; and monitoring, by the UE or the IP edge node, whether an IP session between the IP edge node and the UE is keepalive according to the first discriminator field value in the BFD message. “Multihop BFD” is used as a keepalive monitoring mechanism of a “Multihop IPv6 Session”, thereby realizing keepalive monitoring of the “Multiple hop IPv6 Session”.

Abstract: A method for troubleshooting a set top box is disclosed and can include receiving a trouble ticket from a set top box and initiating a self test at the set top box. The method can also include receiving test results from the set top box and analyzing the test results to isolate a problem.

Abstract: In general, techniques are described for interworking between Ethernet organization, administration, and maintenance (OAM) frames and Asynchronous Transfer Mode (ATM) ATM OAM cells. For example, an access node in an Ethernet and ATM network may implement the techniques. The access node comprises an Ethernet interface that receives an Ethernet OAM Loopback frame from a device within an Ethernet network. The access node includes a control unit that constructs an ATM OAM End-to-End Loopback cell from the Ethernet OAM Loopback frame, and an ATM interface that transmits the ATM OAM End-to-End Loopback cell from the access node towards a virtual circuit connected to a subscriber device to verify connectivity from the originating device within the Ethernet network to the subscriber device within the ATM network.

Abstract: An OAM link trace message is sent from a source node to a target node in a link state protocol controlled Ethernet network. The link trace message uses an 802.1ag format except, as a destination address, it uses either the unicast Ethernet MAC node ID of the target node or the multicast destination address of the service instance. Network topology verification in a link state protocol controlled Ethernet network checks the link state protocol database at a node to ascertain the control plane topology view of at least part of the network. One or more Ethernet OAM commands from the node are executed to ascertain the data plane topology view of the same part of the network. The control plane topology view of the network is compared to the data plane topology view of the network to see if they match. An error is flagged if they do not match.

Abstract: To prevent, in using a multicast DA in an OAM frame, an increase in the network bandwidth usage and in the load of node processing and a degradation of the network reliability caused by a frame being transmitted to all routes in a broadcast domain. A MAC address and other basic frame information and the MEGID are associated with each other, and the MEGID information is added to the OAM frame, and these information are transmitted from an edge node serving as an end point of an ME. In a relay node of the ME, a route control table used for OAM frame control is provided, and a filter is generated by snooping of the OAM frame. Furthermore, when the relay node does not support the OAM function, the MEGID is denoted by a VLAN tag and the route control is made using the snooping function of each VLAN tag.

Abstract: In an Ethernet network element comprising at least one line interface element and a central processing unit (CPU) to control forwarding of data packets at the network element, a method comprising receiving continuity check messages (CCMs) at the at least one line interface element, and processing the CCMs in the at least one line interface element to provide continuity checks for connections to the network element without requiring processing of CCMs by the CPU.

Abstract: A method and apparatus that proxies connectivity check messages and sends fault state changes messages across an MPLS/VPLS network is described. A network element proxies connectivity check messages for remote maintenance endpoints based on a local database. The network element updates the database based on received fault state change message that identify a fault state change of a remote maintenance endpoint. The network element detects fault state changes of local maintenance endpoints and sends a fault state change message to other network elements that proxy connectivity check message for the local maintenance endpoints.

Abstract: A method and apparatus that proxies connectivity check messages and sends fault state changes messages across an MPLS/VPLS network is described. A network element proxies connectivity check messages for remote maintenance endpoints based on a local database. The network element updates the database based on received fault state change message that identify a fault state change of a remote maintenance endpoint. The network element detects fault state changes of local maintenance endpoints and sends a fault state change message to other network elements that proxy connectivity check message for the local maintenance endpoints.

Abstract: In a network wherein a data plane for communicating user data, and a control plane for managing data forwarders are configured of different media, the path teardown of the data plane which is forwarding the data is prevented when a fault has occurred in only the control plane. When the GMPLS controller of the control plane has detected refresh timeout with respect to an adjacent node (101 in FIG. 1), it checks whether or not a transmission equipment corresponding to a faulty controller has a fault (102), and it maintains a path state (103) in a case where the fault is limited to the control plane. Thus, the exchange of refresh messages with the adjacent node is continued without cleaning up the resources of the transmission equipment (104 through 107).

Abstract: A system and method for configuring Maintenance Intermediate Point (MIP) nodes of an Ethernet OAM network based on absolute level indicia as well as relative level indicia encoded in OAM frames generated by Maintenance End Point (MEP) nodes. A first OAM level field in a payload portion of an Ethernet OAM frame is encoded with an absolute OAM level associated with the originating MEP's OAM domain. A second OAM level field is encoded with a relative OAM level indicative of the number of OAM domain levels traversed by the Ethernet OAM frame.

Abstract: An OAM link trace message is sent from a source node to a target node in a link state protocol controlled Ethernet network. The link trace message using an 802.1ag format except, as a destination address, it uses either the unicast Ethernet MAC node ID of the target node, or the multicast destination address of the service instance. A method of network topology verification in a link state protocol controlled Ethernet network checks the link state protocol database at a node to ascertain the control plane topology view of at least part of the network. It then executes one or more Ethernet OAM commands from the node to ascertain the data plane topology view of the same part of the network. The control plane topology view of the network is compared to the data plane topology view of the network to see if they match. An error is flagged if they do not match.

Abstract: A method carrying out connectivity monitoring of an entire network by: transmitting a CCM frame in which the transmission source is set to a multicast MAC address, from a higher level side (center side) terminating device to a plurality of lower level side (base point side) terminating devices; transmitting a CCM frame in which a unicast MAC address is set, from the lower level side terminating devices to the higher level side terminating device; transmitting a CCM frame in which a multicast MAC address is set, from a controller to the higher level side terminating device or the lower level side terminating devices; and transmitting a CCM frame in which a unicast MAC address is set, from the higher level side terminating device or the lower level side terminating devices to the controller.

Abstract: A network relay device is for receiving, from an external network relay device, connection confirmation information indicative of being in communication connection with the external network relay device. When the connection confirmation information is particular connection confirmation information indicative of being transmitted from a predetermined external network relay device, the network relay device provides return confirmation information to the predetermined external network relay device.

Abstract: A gateway is used to segment a network, such as a FAULT TOLERANT ETHERNET (FTE) network, into islands. The gateway receives traffic from a first island, forwards part of the traffic to a second island, and blocks another part of the traffic from being forwarded to the second island. The forwarded traffic could include unicast traffic. The blocked traffic could include broadcast or multicast traffic, including diagnostic messages from one or more nodes in the first island.

Abstract: Improved connectivity verification is disclosed. A root in a point-to-multipoint network can establish parameters for a connectivity-verification session with each endpoint in the network. The root then sends verification-request messages to each endpoint in accordance with the parameters. Each endpoint signals an alarm (e.g., sends a reply to the root) if the verification-request messages are not received at the endpoint in accordance with the established parameters. In this manner, endpoints send verification-reply messages to the root much less frequently, greatly reducing the congestion at the root and greatly reducing the chance that the root gets congested or even overwhelmed when the network includes large numbers of endpoints.

Abstract: A method and system for media independent handover (MIH) using an Ethernet operation, administration and maintenance (OAM) protocol are disclosed. Link connectivity between a user equipment (UE) and an MIH point of service (PoS) is monitored by using an OAM protocol. An OAM trigger indicating a link status is mapped to an MIH event and the MIH event is reported for potential handover. The OAM protocol may be IEEE 802.3ah or 802.1ag.

Abstract: A network element disposed at an edge of a connectivity fault management (CFM) domain includes a switch fabric, a central processor (CP) card, and a line card in communication with the CP card through the switch fabric. The line card includes an Ethernet interface for transmitting and receiving Ethernet CFM frames over a network and circuitry configured to generate new continuity check messages (CCMs) periodically, to process CCMs received on each connection supported by the line card, and to detect a loss of continuity for any of the connections supported by the line card. The line card maintains a list of supported connections. A generate timer and an age counter are associated with each connection in the list. The line card generates a CCM for a given connection when the generate timer expires and detects a loss of continuity for the given connection when its age counter exceeds a threshold.

Abstract: The present disclosure provides methods and apparatus for monitoring performance of a Maintenance Entity (ME) in a computer network. In one embodiment, a method of monitoring performance of an ME includes receiving a control frame via the ME. The method further includes using a hardware performance monitor to provide to a programmable processor a metric indicative of a performance parameter associated with the ME based at least in part on information in the control frame. The method further includes using the programmable processor to determine the performance parameter associated with the ME based at least in part on the metric provided using the hardware performance monitor.

Abstract: A method for determining tentative locations for areas with poor radio coverage in a cellular communication system comprises the step of keeping position-related data of connected user equipment's updated in a network part of the communications system. The method further comprises detection of an accidental loss of connection to a user equipment. The position-related data of such a dropped user equipment is logged as a response to a detection of such accidental loss of connection. The logged position-related data for a multitude of accidental loss events are compiled as a quantity based on the number of accidental losses of connection as a function of the position-related parameter. The method further comprises identification of a tentative location for an area with poor radio coverage by statistical evaluation of that quantity. An arrangement for determining tentative locations for areas with poor radio coverage is also presented.

Abstract: A method for detecting the liveliness and synchronizing the control-plane and data-plane on protecting connections in a shared mesh network environment through methods for probing the protecting connection conditions by sending in-band messages; and synchronization of control plane and data plane by using LSP-ping messages on the protecting connections.

Abstract: Extensions to a Multi-Protocol Label Switching (MPLS) frame forwarding procedure in an MPLS node are described. A context descriptor is defined for each frame received on a connection terminated at that node, and where this context descriptor is provided together with the frame to a corresponding function (e.g. Operations, Administration and Maintenance, OAM) if needed. The context descriptor is constructed based on key attributes characterizing the terminated connection, over which the frame is received, and addresses a particular function endpoint (Maintenance Endpoints (MEPs), Selector Bridge of a protection instance etc.) of a corresponding function (OAM, protection, etc.). In one embodiment, a Multi-Protocol Label Switching (MPLS) node is directed to check not only the first but also the second label, and not to drop the first label (and the label space if relevant) when the second label is the Generic Association Channel Label (GAL). In this way, the original context of the packet is kept (i.e.

Abstract: Systems, methods, and apparatuses for BFD to Y.1731 internetworking are described. In one embodiment, a method of processing defect conditions in a maintenance endpoint (MEP) of a first domain, the MEP a component of a bidirectional forwarding detection (BFD) to Y.1731 interworking interface (IWF) in a multi-protocol label switching (MPLS) network is described.

Abstract: An improved root-cause approach to problem diagnosis in data networks in the form of a method comprising the steps of: associating each metric in a at least one set of metrics with at least one component and/or network device; obtaining values for each such metric from a monitoring system; determining whether each such metric is indicative of a problem within the data network; and ranking and correlating indicative problems to determine whether a problem may be symptomatic of another problem based on an interconnection and/or interdependency between a physical machine and a virtual machine, between components or between components and network devices.

Abstract: Methods for dynamically assigning a multimedia broadcast/multicast service (MBMS) bearer to a Multicast Channel (MCH) in a communication network include a logical server: receiving a MBMS configuration for the communication network; receiving a request for a MBMS bearer within a service area, wherein the request specifies a QoS requirement for the MBMS bearer; inspecting the MBMS configuration to determine if an existing MCH in the service area meets the QoS requirement for the MBMS bearer; based on the inspecting, assigning the MBMS bearer to the existing MCH or assigning the MBMS bearer to a new MCH.

Abstract: A node (110) for an MPLS telecommunications network has interfaces (100) for OAM information exchange relating to a path for data traffic, between first and second other nodes each operating according to different OAM state machines for OAM information exchange. An OAM state machine mapper (120) maps the states of either of the different OAM state machines of the first and second other nodes into states recognised by the other of the different OAM state machines. OAM information exchange is according to either the first or the second OAM state machine and according to states mapped from the other of the OAM state machines, to support the path for data traffic through the node. By such mapping of the different states OAM information can be exchanged across corresponding boundaries and so paths no longer need to be terminated at the boundary to enable end to end operations.

Abstract: A solution for convergence for connectivity fault management includes, at a device having a network interface, maintaining a continuity state. The continuity state is associated with a Connectivity Fault Management (CFM) Maintenance Association (MA) comprising multiple Maintenance End Points (MEPs) including a first MEP associated with the device. The maintaining includes setting the state to a value indicating continuity of the MA if a converged notification is received from the first MEP. The maintaining also includes setting the state value to a value indicating loss of continuity of the MA if a predetermined number of echo packets sent by the device towards the MEPs other than the first MEP are not received by the device within a predetermined time period.

Abstract: A device may detect and report failure in point-to-point Ethernet links. In one implementation, the device may determine, based on a periodic timing signal, whether at least one packet was received on an incoming Ethernet link during a previous period of the periodic timing signal. The device may update an entry in a circular buffer to indicate whether the at least one packet was received during the previous period of the periodic timing signal and analyze the circular buffer to determine whether there is a signal failure on the incoming Ethernet link.

Abstract: A communication apparatus is disclosed for receiving one or more frames from a network. The communication apparatus includes a first determining part configured to search a first table by using a VLAN identifier included in one of the frames, a second determining part configured to search a second table by referring to a search result of the first determining part and using an OAM identifier included in the one of the frames, a selecting part configured to determine whether the one of the frames is an OAM frame according to the search result of the second determining part, and a terminating part configured to terminate the one of the frames determined as the OAM frame by the selecting part.

Abstract: A method for allocating and configuring TCM in an embodiment of the present invention includes: configuring the domain that needs TCM in a network and the scope of the domain; determining the ODU service that needs TCM; and allocating TCM automatically according to the ODU service trail and the configured domain; and enabling or disabling the TCM of each level. The present invention enables the system to allocate TCM automatically. The TCM levels can be allocated easily in a centralized way, or for each node in a distributed way. The present invention ensures that the TCM level allocated for the service in the forward direction corresponds to that in the reverse direction. The method is perfectly applicable to the networks of more than six operators. The TCM levels are handled according to the allocated order, thus ensuring correct insertion of AIS and BDI and unique result of insertion.

Abstract: A method of operation within a device coupled to a network. A first set of data is received from a first data path of the network. A first set of measurement information is identified from the first set of data, and a quality of the first data path is determined based on the first set of measurement information. A second set of data is then selectively transmitted via either the first data path or a second data path of the network, based on the quality of the first data path.

Abstract: A method and network are described herein for provisioning Operations, Administration, and Maintenance (OAM) entities for a connection when setting-up the connection between an ingress edge node and an egress edge node.

Abstract: A method of MDT information logging and problem event reporting is provided. The method supports provisioning of reference events to enable correlation of system time and the problem occurrence. In one embodiment, a problem event report includes time information directly or indirectly related to a reference event. A method of handling battery condition is also provided. The method supports autonomously suspending or resuming OAM activities in MDT based on predefined battery condition. In one embodiment, a testable battery condition handling is designed for MDT logging.

Abstract: In accordance with a non-limiting example, a system and method minimizes collisions between transmitted connectivity fault management (CFM) packets. Maintenance association endpoints are formed from a plurality of network switch elements to form a maintenance association. The clocks between each network switch element within the maintenance association are synchronized. A unique transmission window is assigned to each maintenance association endpoint as part of the maintenance association. A respective CFM packet is transmitted as a continuity check message (CCM) within the unique transmission window.

Abstract: Techniques are provided for assisting in the processing of failure detection protocol (FDP) packets. Techniques are provided that assist a CPU of a network device in processing incoming FDP packets. In one embodiment, only a subset of FDP packets received by the network device is forwarded to the CPU for processing, the other FDP packets are dropped and not forwarded to the CPU. The processing is performed using dual memory structures that enable receipt of FDP packets by the network device to be decoupled from the processing of FDP packets by the CPU of the network device.

Abstract: A fault detection method, a communication system, and an LSR are provided herein to overcome the inability of performing BFD packet resolution fault detection for multiple nodes in the conventional art. The method includes: determining a hop count between a first node and a second node on an LSP, where the second node is located downstream of the first node; encapsulating a BFD packet into an MPLS packet that carries information about the hop count between the first node and the second node; sending the MPLS packet from the first node along the active LSP; and judging, by the node that receives the MPLS packet, whether this node is the second node according to the hop count. If this node is the second node, extract the BFD packet for detect, and obtaining a fault detection result. Otherwise, forward the MPLS packet. Through the technical solution provided by the invention, the fault detection is more flexible in the MPLS.

Abstract: A method for detecting OAM includes: sending a detection maintenance entity OAM command to a network element equipment board after a user activating an established maintenance entity; receiving a reply message sent by the network element equipment board and acquiring replying board information and monitoring ID information matched with the maintenance entity; and starting a timer, and detecting whether preconfigured heartbeat detection time is reached, if not reached, detecting whether a OAM detection result which is reported by the network element equipment board and is matched with a monitoring ID is received, if received, transferring the OAM detection result to a network management interface to be displayed; and if reached, sending the heartbeat detection message, and detecting whether the OAM detection result which is reported by the network element equipment board and is matched with the monitoring ID is received after receiving a heartbeat reply message.

Abstract: A method performed by a network device may include establishing performance-based Bidirectional Forwarding Detection (BFD) sessions for each link of a primary traffic engineering Label Switched Path (TE-LSP) and establishing performance-based BFD sessions for each link of a secondary TE-LSP. The method may also include, monitoring performance of the primary TE-LSP based on the performance-based BFD sessions for each link of the primary TE-LSP and monitoring performance of the secondary TE-LSP based on the performance-based BFD sessions for each link of the secondary TE-LSP. The method may further include determining that the performance of the primary TE-LSP is degraded based on the monitoring of the performance of the primary TE-LSP and automatically switching a flow of data unit traffic from the primary TE-LSP to the secondary TE-LSP when the performance of the primary TE-LSP is degraded.

Abstract: The present invention relates to methods and arrangements in an MPLS-TP network, comprising a plurality of interconnected routers configured for MPLS-TP, wherein at least a first router is defined as an originating Maintenance End Point, MEP, a second router is defined as a targeting MEP and the third router is defined as a Maintenance Intermediate Point, MIP. The basic idea of the present invention is to associate a table with each MIP and MEP, wherein the tables comprises information related to the MEPs of the MPLS-TP network and the information from the tables is inserted in the reply packets and forwarded packets. By using this information, the OAM packets can find the subsequent MIP or MEP and failure localization may be performed.

Abstract: A network system, management server, and OAM test management method for grouping the virtual networks, selecting a test target for each group, and lowering the network load and the operating load in the OAM testing. Grouping the multiple virtual networks based on their physical topology and selecting a representative virtual network for each group, allows selecting a test target virtual network from among the representative virtual networks for the virtual network selected by the operator and executing tests.

Abstract: A method for signalling of data transmission path properties is proposed. The method contains several steps at a first network endpoint device. As a first step, at least one data transmission path is provided via a client-server interface to a client device by the first network endpoint device. The data transmission path is a path through the network connecting the first network endpoint device and a second network endpoint device. As a second step, the first network endpoint device receives via a server-network interface OAM information generated by the second network endpoint device or internal network devices and terminates this received OAM information. As a third step, the first network endpoint device determines at least one data transmission property parameter from such received OAM information which was generated by the second network endpoint device or internal network devices.