KR20160109162A - Operation method for maintenance in mpls-tp network and apparatus thereof - Google Patents

Abstract

Disclosed are an operation method for maintenance in a Multi-Protocol Label Switching-Transport Profile (MPLS-TP) network and an apparatus for performing the operation method. A method for operating a target endpoint according to an aspect of the present invention may comprise the steps of: switching over to a protection path in response to absence of detection of a first connection check message transmitted by a source endpoint via a working path; and setting at least one intermediate point as a temporary endpoint. The at least one intermediate point may transmit a second connection check message, including at least one of location information of a faulty link and a bandwidth occupation release message related to the faulty link, to a target endpoint after having been set as the temporary endpoint.

Description

[0001] OPERATION METHOD FOR MAINTENANCE IN MPLS-TP NETWORK AND APPARATUS THEREOF [0002]

The following embodiments relate to maintenance techniques in an MPLS-TP (Multi Protocol Label Switching-Transport Profile) network, and more particularly to a method for deallocation and occupancy return of bandwidth resources of links included in an end- ≪ / RTI >

The MPLS-TP (Multi Protocol Label Switching-Transport Profile) network provides a protection recovery service for the traffic forwarding flow to guarantee the reliability of the traffic. Protection The recovery service includes various protection recovery methods defined by the Internet Engineering Task Force (IETF) or International Telecommunications Union-Telecommunication (ITU-T).

In general, a 1: 1 linear protection recovery method is applied to an MPLS-TP network. According to the 1: 1 linear recovery method, traffic is delivered to the operation delivery flow, and when a failure occurs, the traffic of the operation delivery flow is switched to the protection delivery flow with respect to the end node. The faulted traffic operation forwarding flow remains in a failed state until the fault is recovered. In the existing protection recovery service, if a failure occurs in a certain link interval, the failed traffic forwarding flow occupies the bandwidth of all the links between the ending paths. At this time, if another traffic forwarding flow can use the bandwidth of the normal link interval except for the link interval in which the failure occurs, the bandwidth efficiency can be greatly increased. Here, another traffic forwarding flow can deliver traffic requiring low reliability, such as "Best Effort service ".

The MPLS-TP packet transmission device is configured to use the bandwidth of the link segments occupied by the failed traffic flow, the bandwidth of the normal link interval excluding the failed link, or the traffic for the original protection recovery service There is a need for maintenance signals and control methods for dynamic bandwidth occupancy and release in the link section of the flow.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a maintenance technique for increasing the bandwidth efficiency by using the bandwidth of the normal link interval except the link interval in the MPLS-TP (Multi Protocol Label Switching-Transport Profile) network.

A method of operating an end node in an MPLS-TP network comprising a source end node, at least one intermediate node and a target end node along a side, Switching over to a preliminary path based on undetected detection of a first connection confirmation message transmitted by the first connection confirmation message; And setting the at least one intermediate node as a temporary end node.

The method of operation may further comprise receiving a second connection confirmation message from the at least one intermediate node set to the temporary end node.

The second connection acknowledgment message may include at least one of location information of the failed link or a bandwidth occupation release message associated with the failed link.

The second connection acknowledgment message may include a flag indicating either normal, operational path failure, or spare path failure.

The method may further comprise transmitting a second connection confirmation message to the source end node via the spare path, the second connection confirmation message including at least one of a failure link information or a bandwidth unblock message associated with the failure link.

A method of operating the second intermediate node in an MPLS-TP network comprising a source end node, a first intermediate node, a second intermediate node, and a target end node according to one side, Detecting a failed link between the first intermediate node and the second intermediate node based on undetected detection of a first connection acknowledgment message sent by the first intermediate node set to the node; And transmitting a second connection acknowledgment message to the target end node.

The second connection acknowledgment message may include at least one of location information of the failed link or a bandwidth occupation release message associated with the failed link.

The first connection confirmation message and the second connection confirmation message may be transmitted through an operation path.

The first connection acknowledgment message may be generated by the source end node.

The method may further include returning an occupancy of the bandwidth of the failed link upon receiving the second connection acknowledgment message from the first intermediate node.

The second connection acknowledgment message may include a flag indicating either normal, operational path failure, or spare path failure.

The method may further include unsetting the temporary end node upon receiving the second connection acknowledgment message from the first intermediate node.

A multi-protocol Label Switching-Transport Profile (MPLS-TP) network according to one side includes: a source end node for transmitting a first connection confirmation message through an operation path; At least one intermediate node for transmitting the first connection confirmation message; And a target end node switching over to a redundant path based on undetected detection of the first connection acknowledgment message.

The at least one intermediate node may be set as a temporary end node according to the non-detection of the first connection acknowledgment message by the target end node.

The at least one intermediate node may send a second connection confirmation message to the target end node after it is set as a temporary end node.

The second connection acknowledgment message may include at least one of location information of the failed link or a bandwidth occupation release message associated with the failed link.

The second connection acknowledgment message may include a flag indicating either normal, operational path failure, or spare path failure.

The at least one intermediate node may include a first intermediate node and a second intermediate node and the second intermediate node may be configured to detect a non-detection of a first connection acknowledgment message sent by the first intermediate node set as a temporary end node , It is possible to detect a failure link between the first intermediate node and the second intermediate node.

Occupancy of the failed link may be recovered as the second intermediate node receives the second connection acknowledgment message from the first intermediate node.

According to the embodiments described below, it is possible to increase the bandwidth efficiency by using the bandwidth of the normal link interval except for the link interval in the MPLS-TP (Multi Protocol Label Switching-Transport Profile) network.

FIG. 1 illustrates a Multi Protocol Label Switching-Transport Profile (MPLS-TP) network according to an embodiment; FIG.
2 is a diagram illustrating a maintenance control apparatus according to an embodiment;
3 is a diagram illustrating a bandwidth occupation release operation of an operation path according to an embodiment;
4 is a view for explaining a bandwidth occupation release operation of a spare path according to an embodiment;
5 illustrates a bandwidth reservation release message according to an embodiment;
6 is a view for explaining a bandwidth occupation return operation of an operation path according to an embodiment;
7 is a view for explaining a bandwidth occupancy return operation of a redundant path according to an embodiment;
8 is a flowchart illustrating a maintenance method of an operation path according to an embodiment;
9 is a flowchart illustrating a maintenance method of a spare path according to an embodiment;

In the following, embodiments will be described in detail with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

Various modifications may be made to the embodiments described below. It is to be understood that the embodiments described below are not intended to limit the embodiments, but include all modifications, equivalents, and alternatives to them.

The terms used in the examples are used only to illustrate specific embodiments and are not intended to limit the embodiments. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this embodiment belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

In the following description of the present invention with reference to the accompanying drawings, the same components are denoted by the same reference numerals regardless of the reference numerals, and redundant explanations thereof will be omitted. In the following description of the embodiments, a detailed description of related arts will be omitted if it is determined that the gist of the embodiments may be unnecessarily blurred.

1 is a diagram illustrating a Multi Protocol Label Switching-Transport Profile (MPLS-TP) network according to an exemplary embodiment.

1, an MPLS-TP network includes MEP endpoints (MEPs) 101 and 102 and MEG intermediate points (MIP) 201, 202, 203 and 204 . Here, MEG (ME Group) means a set of one or more MEs belonging to the same transmission path and maintained and monitored as a group. ME refers to a relationship between any two points of a transport path for management such as maintenance and monitoring in an MPLS-TP network. The ME of the MPLS-TP includes a section, A label switched path (LSP) and a pseudo-wire (PW).

The MEPs 101 and 102 and the MIPs 201, 202, 203 and 204 are connected to the physical link 30 and the physical link 30 can constitute a traffic forwarding flow. The traffic forwarding flow may be a label switched path (LSP). The traffic forwarding flow may include a working path 10 and a protection path 20. When a failure occurs in the link of the operation path 10, the traffic transfer flow may be switched over to the spare path 20. [ Conversely, if a failure occurs in the link of the backup path 20, the traffic transfer flow may be switched over to the operational path 10. [

A Continuity Check Message (CCM) of an Operation, Administration, Maintenance (OAM) packet can be used to monitor a link failure. The MEPs 101 and 102 periodically generate and deliver CCMs to monitor the state of traffic flow. Hereinafter, an MEP that generates an OAM packet based on a unidirectional reference is referred to as a source MEP, and an MEP that is a destination of an OAM packet and finally receives an OAM packet is referred to as a target MEP.

In the MEP 101, the MEP 102 transmits the CCM to the operation path 10 and the backup path 20 to monitor the status of the link. When a fault occurs in the link between the MIP 201 and the MIP 202, the MEP 102 fails to receive the CCM transmitted by the MEP 101. The MEP 102 switches to the spare path 20 and provides maintenance services through Automatic Protection Switching (APS) and Remote Defect Indication (RDI). The bandwidth of the entire operation path 10 is occupied by the link fault between the MIP 201 and the MIP 202 according to the conventional method. In other words, the link between the MEP 101 and the MIP 201 and the link between the MIP 202 and the MEP 102, in which the link failure has not occurred, are also in an unusable state. According to the embodiment to be described below, resources can be efficiently used by releasing the occupation of the bandwidth between the MEP 101 and the MIP 201 and the link between the MIP 202 and the MEP 102.

2 is a view for explaining a maintenance control apparatus according to an embodiment.

2, the maintenance control device 50 includes a packet receiving unit 51, a message processing unit 52, a link information managing unit 53, and a packet transmitting unit 54. The packet receiving unit 51, the message processing unit 52, the link information managing unit 53, and the packet transmitting unit 54 may be implemented by one or more hardware modules or one or more software modules. The maintenance control device 50 may be installed for each of the MEPs 101 and 102 and the MIPs 201, 202, 203 and 204 or may be installed for the entire MPLS-TP network.

The packet receiving unit 51 receives a received packet from a neighboring node or an external device, and performs necessary processing on the received packet.

The message processing unit 52 can generate or detect messages necessary for maintenance. For example, the messages may include a CCM for monitoring the connection status between the nodes and a message for occupying the bandwidth. The CCM for monitoring the connection status between the nodes below may be referred to as CCM_N. In addition, the message for occupancy release of the bandwidth in the operational path may be referred to as CCM_WLF, and the message for the occupation release of the bandwidth in the redundant path may be referred to as CCM_PLF.

The link information management unit 53 manages link information between nodes belonging to the MPLS-TP network. For example, the link information management unit 53 can manage the location information of the failed link. Also, the link information management unit 53 manages information on the traffic delivery flow in the MPLS-TP network. For example, the link information management unit 53 may configure the operation path and the backup path by setting the nodes as the end node or the intermediate node.

The packet transmission unit 54 transmits the transmission packet to the neighboring node or an external device, and performs necessary processing on the transmission packet.

The specific operations of the packet receiving unit 51, the message processing unit 52, the link information managing unit 53 and the packet transmitting unit 54 will be described in detail below.

3 is a view for explaining a bandwidth occupation release operation of an operation path according to an embodiment.

3, the bandwidth occupation release operation of the MEP 101, 102 and the MIP 201, 202 is shown when a link failure occurs between the MIP 201 and the MIP 202 in the operational path. In Fig. 3, solid line arrows indicate transmission over an operational path, and dotted arrows indicate transmission over a redundant path.

To do this, at step 301, the MEP 101 transmits CCM_N in the direction of the MEP 102. The CCM_N is a message for monitoring the connection state between the MEPs 101 and 102 and the MIPs 201 and 202. Due to a link failure between the MIP 203 and the MIP 204, the CCM_N is not received at the MEP 102. The CCM_N is generated through the message processing unit 52 of FIG. 2 and can be transmitted through the packet transmitting unit 54 of FIG.

In step 302, the MEP 102 determines that CCM_N is not detected. According to one aspect, the MEP 102 may determine that CCM_N is not detected if CCM_N is not received within a predetermined period. The non-detection of the CCM_N may be determined by the message processing unit 52 in Fig.

In step 303, the MIP 201 adjacent to the point where the failure occurs is set as a temporary MEP. In step 304, the MIP 202 adjacent to the point of failure is set as a temporary MEP. According to one aspect, the MIP 201 and the MIP 202 may be set as a temporary MEP by the MEP 102. The MIP 201 and the MIP 202 can be set as temporary MEPs by the link information management unit 53 of the MEP 102 shown in FIG.

At step 306, the MEP 303 at the MIP 201 generates CCM_N and sends CCM_N to the MIP 202 at the MIP 202 point. The CCM_N is received through the packet receiving unit 54 in FIG. 2, generated through the message processing unit 52 in FIG. 2, and transmitted through the packet transmitting unit 54 in FIG. Due to the link failure between the MIP 201 and the MIP 202, the CCM_N is not received by the MIP 202.

At step 307, the MEP 304 at the MIP 202 determines the undetected CCM_N. According to one aspect, the MEP 304 at the MIP 202 may determine that CCM_N is not detected if CCM_N is not received within a predetermined period. The non-detection of the CCM_N may be determined by the message processing unit 52 in Fig.

In step 308, the MIP 202 detects a failure link. The MIP 202 can detect that a link failure has occurred between the MIP 201 and the MIP 202 based on the detection of the CCM_N. The link information management unit 53 of FIG. 202 of the link information.

In step 309, the MIP 202 generates a CCM_WLF and forwards the CCM_WLF to the MEP 102. CCM_WLF is a message for releasing the occupation of bandwidth in the operational path. The CCM_WLF may include at least one of location information of the failed link or a bandwidth unlock message associated with the failed link. The bandwidth segregation cancellation message may include a flag indicating either normal, operational path failure, or reserved path failure. The flag will be described in detail with reference to FIG. The CCM_WLF is generated through the message processing unit 52 of FIG. 2, and can be transmitted through the packet transfer unit 54 of FIG.

At step 310, the MEP 102 detects the CCM_WLF sent by the MIP 202 and generates a CCM_WLF. In addition, the MEP 102 transmits CCM_WLF to the MEP 101. [ As shown in FIG. 3, the MEP 102 may send the CCM_WLF to the MEP 101 via the redundant path. CCM_WLF can be detected through the packet receiving unit 51 of FIG. Also, the CCM_WLF is generated through the message processing unit 52 of FIG. 2 and can be transmitted through the packet transfer unit 54 of FIG.

In step 311, the MEP 101 detects the CCM_WLF sent by the MEP 102 and generates a CCM_WLF. Also, the MEP 101 transmits the CCM_WLF to the MIP 201. CCM_WLF can be detected through the packet receiving unit 51 of FIG. Also, the CCM_WLF is generated through the message processing unit 52 of FIG. 2 and can be transmitted through the packet transfer unit 54 of FIG.

In step 312, the MIP 201 detects the CCM_WLF sent by the MEP 101 and generates CCM_WLF. Also, the MIP 201 transmits the CCM_WLF to the MIP 202. CCM_WLF can be detected through the packet receiving unit 51 of FIG. Also, the CCM_WLF is generated through the message processing unit 52 of FIG. 2 and can be transmitted through the packet transfer unit 54 of FIG. The link information management unit 53 of FIG. 2 updates only the link section that receives the CCM_WLF message among the links used in the operation path to reusable link information.

Through this operation, the bandwidth occupation of the normal link section can be released. Therefore, the MPLS-TP network can increase the bandwidth efficiency by using the bandwidth of the normal link interval except for the link interval in which the failure occurs.

4 is a view for explaining a bandwidth occupation release operation of a redundant path according to an embodiment.

4, the bandwidth segregation operation of the MEP 101, 102 and the MIP 203, 204 is shown when a link failure occurs between the MIP 203 and the MIP 204 in the spare path. In Fig. 4, solid line arrows indicate transmission over an operational path, and dotted arrows indicate transmission over a redundant path. Except for the contents of the traffic forwarding flow and the CCM_PLF below, the contents described in FIG. 3 can be applied as they are.

In step 401, the MEP 101 transmits CCM_N in the direction of the MEP 102. In step 402, the MEP 102 determines that CCM_N is not detected. At step 403, the MIP 203 is set to a temporary MEP. Similarly, at step 404, the MIP 204 is also set as a temporary MEP. At step 406, CCM_N 406 is generated by the MEP 403 at the MIP 203 and CCM_N 406 is transmitted to the MIP 404 at the MIP 204 point. In step 407, the MIP 204 determines that CCM_N is not detected. At step 408, the MIP 204 detects the failure link.

At step 409, the MIP 204 generates a CCM_PLF and forwards the CCM_PLF to the MEP 102. CCM_PLF is a message for releasing the occupation of the bandwidth in the spare path. The CCM_PLF may include at least one of location information of the fault link or a bandwidth reservation release message associated with the fault link. The bandwidth segregation cancellation message may include a flag indicating either normal, operational path failure, or reserved path failure. The flag will be described in detail with reference to FIG.

Next, at step 410, the MEP 102 detects the CCM_PLF sent by the MIP 204 and generates CCM_PLF. In step 411, the MEP 101 detects the CCM_PLF sent by the MEP 102 and generates CCM_PLF. In step 412, the MIP 203 detects the CCM_PLF sent by the MEP 101 and generates CCM_PLF. The link information management unit 53 of FIG. 2 updates only the link interval that receives the CCM_PLF message among the links used in the spare path to reusable link information.

Through this operation, the bandwidth occupation of the normal link section can be released. Therefore, the MPLS-TP network can increase the bandwidth efficiency by using the bandwidth of the normal link interval except for the link interval in which the failure occurs.

5 is a view for explaining a bandwidth occupation release message according to an exemplary embodiment of the present invention.

Referring to FIG. 5, the flags included in the bandwidth occupancy release message are shown. The flag may be a CCM payload data unit flag defined in the standard. The flag may include a flag indicating either normal, operational path failure, or reserved path fault in a reserved field. For example, "0000" in the reserved field may indicate normal, "0001" may indicate an operational path disturbance, and "0002" may indicate a spare path disturbance. According to one aspect, CCM_WLF for occupancy release of bandwidth in the operational path may include a flag indicating an operational path failure, and CCM_PLF for occupying the bandwidth in the spare path may include a flag indicating a standby path failure.

6 is a view for explaining the bandwidth occupation return operation of the operation path according to the embodiment.

6, an operation to restore the occupancy of the bandwidth of the MEPs 101, 102 and the MIPs 201, 202 when the link failure is eliminated between the MIP 201 and the MIP 202 in the operational path is shown have. In FIG. 6, solid line arrows indicate transmission over the operational path, and dotted arrows indicate transmission over the redundant path.

In step 601, the MEP 101 generates a CCM_WLF and sends a CCM_WLF to the MIP 201. The CCM_WLF is generated through the message processing unit 52 of FIG. 2, and can be transmitted through the packet transfer unit 54 of FIG.

In step 602, the MIP 201 detects the CCM_WLF sent by the MEP 101, generates the CCM_WLF, and sends the WLF to the MIP 202. CCM_WLF can be detected through the packet receiving unit 54 in Fig. Also, the CCM_WLF is generated through the message processing unit 52 of FIG. 2 and can be transmitted through the packet transfer unit 54 of FIG.

In step 603, the MIP 202 detects the CCM_WLF sent by the MIP 201, and releases the failed link due to undetected CCM_N based on the detection of the CCM_WLF. The link information management unit 53 of FIG. 2 can update the link information between the MIP 201 and the MIP 202. Occupancy for the bandwidth of the failed link is returned upon release of the failed link.

In step 604, the MIP 201 releases the temporary MEP set in step 303 of FIG. Similarly, at step 605, the MIP 202 releases the temporary MEP set in step 304 of FIG. The setting of the temporary MEP can be released by the message processing unit 52 in Fig.

At step 606, the MEP 101 sends the CCM_N to the MEP 102. The CCM_N may be received by the MEP 102 because the failed link is released and the occupancy for the bandwidth of the failed link is restored.

7 is a view for explaining a bandwidth occupation return operation of a redundant path according to an embodiment.

7, an operation of restoring the occupied roles of the bandwidths of the MEPs 101, 102 and the MIPs 203, 204 when the link failure is eliminated between the MIP 203 and the MIP 204 in the spare path is shown have. In Fig. 7, a solid line arrow indicates transmission over an operational path, and a dotted arrow indicates transmission over a redundant path. Except for the contents of the traffic forwarding flow and the CCM_PLF below, the contents described in FIG. 6 may be applied as they are.

In step 701, the MEP 101 generates a CCM_PLF and sends CCM_PLF to the MIP 203. [ In step 702, the MIP 203 detects the CCM_PLF sent by the MEP 101, generates the CCM_PLF, and sends the PLF to the MIP 204. [ In step 703, the MIP 204 detects the CCM_PLF sent by the MIP 203 and releases the failed link due to undetected CCM_N based on the detection of CCM_WLF. In step 704, the MIP 203 releases the temporary MEP set in step 303 of FIG. Similarly, at step 705, the MIP 204 releases the temporary MEP set in step 304 of FIG. In step 706, the MEP 101 sends the CCM_N to the MEP 102. The CCM_N may be received by the MEP 102 because the failed link is released and the occupancy for the bandwidth of the failed link is restored.

8 is a flowchart illustrating a maintenance method of an operation path according to an embodiment.

Referring to FIG. 8, in step 801, the source end node delivers a first connection acknowledgment message on the operational path. The first connection confirmation message means CCM_N described above. In step 802, the target end node switches to the spare path based on the undetected first connection acknowledgment message. In step 803, the intermediate node is set as a temporary end node. In step 804, all nodes deliver a first connection acknowledgment message on the operational path. In step 805, the particular node detects the failed link based on the undetected first connection acknowledgment message. For example, if a failure occurs in the link between the MIP 201 of FIG. 1 and the MIP 202 of FIG. 1, the particular node may be the MIP 202 of FIG. In step 806, all the nodes transmit the second connection confirmation message to the detected specific node. The second connection confirmation message means CCM_WLF described above. In step 807, all nodes release occupancy of bandwidth based on the second connection confirmation message. In step 808, the node that detected the failure link receives the second connection confirmation message. In step 809, the setting of the temporary end node to the intermediate node is released. At step 810, occupancy of the bandwidth is returned. 1 to 7 can be directly applied to each step of FIG. 8, so that detailed description is omitted.

FIG. 9 is a flowchart illustrating a maintenance method of a backup path according to an embodiment.

Except for the contents of the traffic forwarding flow and the CCM_PLF below, the contents described in FIG. 8 may be applied as they are.

Referring to Fig. 9, in step 801, the source end node delivers a first connection acknowledgment message on the spare path. The first connection confirmation message means CCM_N described above. In step 902, the target end node switches to the operational path based on an undetected first connection acknowledgment message. In step 903, the intermediate node is set as a temporary end node. In step 904, all nodes forward the first connection acknowledgment message on the redundant path. In step 905, the specific node detects the failed link based on the non-detection of the first connection confirmation message. In step 906, every node delivers a second connection confirmation message to the node that detected the failure link. The second connection confirmation message means CCM_PLF described above. In step 907, all the nodes release the occupation of the bandwidth based on the second connection confirmation message. In step 908, the particular node that detected the failed link receives the second connection confirmation message. In step 909, the setting of the temporary end node for the intermediate node is released. In step 910, occupancy of the bandwidth is returned. 1 to 8 can be applied to each step of FIG. 9 as it is, so that detailed description will be omitted.

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (18)

A method of operating an end node in an MPLS-TP network including a source end node, at least one intermediate node and a target end node,
Switching over to a preliminary path based on undetected detection of a first connection acknowledgment message sent by the source end node via an operational path; And
Establishing the at least one intermediate node as a temporary end node
. ≪ / RTI > The method according to claim 1,
Further comprising receiving a second connection confirmation message from the at least one intermediate node set to the temporary end node. 3. The method of claim 2,
Wherein the second connection confirmation message comprises at least one of location information of a failed link or a bandwidth occupation release message associated with the failed link. 3. The method of claim 2,
Wherein the second connection acknowledgment message includes a flag indicating either normal, operational path failure, or spare path failure. The method according to claim 1,
Further comprising transmitting a second connection confirmation message via the spare path to the source end node, the second connection confirmation message including at least one of a failure link information or a bandwidth deallocation message associated with the failure link. A method for operating a second intermediate node in an MPLS-TP network comprising a source end node, a first intermediate node, a second intermediate node and a target end node,
Detecting a failure link between the first intermediate node and the second intermediate node based on undetected detection of a first connection acknowledgment message sent by the first intermediate node set as a temporary terminating node; And
And sending a second connection confirmation message to the target end node. The method according to claim 6,
Wherein the second connection confirmation message comprises at least one of location information of the failed link or a bandwidth occupation release message associated with the failed link. The method according to claim 6,
Wherein the first connection confirmation message and the second connection confirmation message are transmitted through an operation path. The method according to claim 6,
Wherein the first connection acknowledgment message is generated by the source end node. The method according to claim 6,
Returning an occupancy for the bandwidth of the failed link upon receiving the second connection acknowledgment message from the first intermediate node. The method according to claim 6,
Wherein the second connection acknowledgment message includes a flag indicating either normal, operational path failure, or spare path failure. The method according to claim 6,
Further comprising unsetting the temporary end node upon receiving the second connection acknowledgment message from the first intermediate node. A source end node that transmits a first connection acknowledgment message through an operation path;
At least one intermediate node for transmitting the first connection confirmation message; And
The target end node switching over to the preliminary path based on the non-detection of the first connection confirmation message,
Lt; / RTI >
Wherein the at least one intermediate node is set as a temporary end node according to an undetected detection of the first connection acknowledgment message by the target end node. 14. The method of claim 13,
Wherein the at least one intermediate node sends a second connection acknowledgment message to the target end node after being established as a temporary terminating node. 15. The method of claim 14,
Wherein the second connection acknowledgment message comprises at least one of location information of a failed link or a bandwidth occupation release message associated with the failed link. 15. The method of claim 14,
Wherein the second connection acknowledgment message includes a flag indicating either normal, operational path failure, or spare path failure. 14. The method of claim 13,
Wherein the at least one intermediate node comprises a first intermediate node and a second intermediate node,
The second intermediate node detects a failure link between the first intermediate node and the second intermediate node based on an undetected detection of a first connection acknowledgment message sent by the first intermediate node set as a temporary end node , MPLS-TP network. 18. The method of claim 17,
Wherein the occupancy of the failed link is resumed as the second intermediate node receives the second connection acknowledgment message from the first intermediate node.

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