CN102215127A - Signal degrade processing method, device and node equipment - Google Patents
Signal degrade processing method, device and node equipment Download PDFInfo
- Publication number
- CN102215127A CN102215127A CN2011101525319A CN201110152531A CN102215127A CN 102215127 A CN102215127 A CN 102215127A CN 2011101525319 A CN2011101525319 A CN 2011101525319A CN 201110152531 A CN201110152531 A CN 201110152531A CN 102215127 A CN102215127 A CN 102215127A
- Authority
- CN
- China
- Prior art keywords
- signal degradation
- module
- alarm
- node
- node device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0604—Management of faults, events, alarms or notifications using filtering, e.g. reduction of information by using priority, element types, position or time
- H04L41/0609—Management of faults, events, alarms or notifications using filtering, e.g. reduction of information by using priority, element types, position or time based on severity or priority
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The embodiment of the invention provides a signal degradation processing method, device and node equipment. The method specifically comprises the following steps: when a processing module determines that a node generates a signal degradation alarm, respectively carrying out signal degradation processing on different types of signal degradation alarms according to a degraded alarm type; if the type is an FEI (Forward Error Information) alarm, generating an interface alarm, and finishing the processing flow; and if the type is an SD (Signal Degradation) alarm, switching a tunnel so as to process the signal degradation when the signal degradation is generated in a node.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a signal degradation processing method and apparatus, and a node device.
Background
The most basic goal of the evolution of the development of telecommunication transport networks is to reduce the cost of information transfer in communications. With the expansion of packet access bandwidth and the deployment of Next Generation Networks (NGN), time-division channelized transport has been difficult to meet this basic goal. In order to meet the requirement of information transmission, a packet transmission technology oriented to connection is a development trend of a transmission network.
In the connection-oriented Packet Transport technology, Transport Multi-Protocol Label Switching (T-MPLS, Transport-Multi-Protocol Label Switching) is a Packet Transport Network (PTN) technology standardized by the International Telecommunication Union (ITU-T), which can solve the problem of low efficiency of a conventional Synchronous Digital Hierarchy (SDH) exposed in a Network environment in which Packet Switching is mainly used, and is a mainstream Packet Transport technology. The data forwarding plane of the T-MPLS network is a subset of Multi-Protocol Label Switching (MPLS), and forwarding is performed based on the T-MPLS Label, which removes the connectionless forwarding characteristic based on IP, and increases end-to-end operations, Administration and Maintenance (OAM) and protection recovery functions. And the T-MPLS Network uses an automatic Switched Optical Network/Generalized multiprotocol Label Switching (ASON/GMPLS, automatic Switched Optical Network/Generalized Multi-protocol Label Switching) as its control plane.
In the process of information transmission using a T-MPLS network, packet loss in a Label Switching Path (LSP) is mainly caused by the following two reasons: one is packet loss caused by node congestion, and the other is packet loss caused by line errors or errors of an interconnection bus inside the node, and the packet loss is caused by the line errors. A Signal anomaly (SF) detection concept and a Signal Degradation (SD) detection concept have been proposed for the packet loss problem, where the Signal anomaly is a problem that a packet cannot be received within a set time due to a packet loss, and the Signal degradation is a problem that a packet loss is caused by a line error, and the error rate of a line increases.
In the prior art, according to the definition of ITU-T Recommendation g.8114/y.1373, for the concept of signal anomaly detection, once a fault condition is detected, including the loss of continuity, the mix of errors, the levels of undesired Maintenance Entity Group end Point (MEP) and undesired Maintenance Entity Group (MEG), the MEP declares the entry of a signal anomaly condition. A signal anomaly may also be declared by a terminal at the server layer, thereby informing the server/Ethernet (ETH, Ethernet) adaptation function (e.g., server MEP) about a failure condition at the server layer. However, in the prior art, there is no suggestion on how to perform signal degradation declaration.
And according to the definition of ITU-T y.1731, configured MEPs (including server MEPs) can send out frames with Ethernet Alarm Indication Signal function (ETH-AIS) information. Upon detection of a signal anomaly, the MEP may immediately begin periodically sending frames with ETH-AIS information at the configured customer MEG level until the signal anomaly is resolved. Upon receiving a frame with ETH-AIS information, an MEP detects an Alarm Indication Signal (AIS) condition, suppressing alarms associated with loss of continuity (LOC) faults associated with all of its peer MEPs. The MEP will resume generating alarms for loss of continuity faults when it detects a loss of continuity fault without AIS. For the AIS message, corresponding blocking or non-blocking operations are performed on detecting LOC, Unexpected Period (Unexpected Period), receiving AIS frame, detecting error mixing, Unexpected mep (Unexpected mep), and detecting Unexpected MEG Level (Unexpected MEG Level), but in the prior art, there is no relevant suggestion on how to operate for signal degradation.
Disclosure of Invention
The embodiment of the invention provides a signal degradation processing method, a signal degradation processing device and node equipment, which are used for solving the problem that corresponding processing aiming at signal degradation is not available in the prior art.
A method of signal degradation processing, the method comprising:
the node equipment determines to generate a signal degradation alarm; and
determining a type of the generated signal degradation alarm;
if the determined type is a forward error notification FEI alarm, the node equipment generates an interface alarm and ends the processing flow, and if the determined type is a degraded SD alarm, the node equipment performs tunnel switching.
A signal degradation processing apparatus, the apparatus comprising:
the alarm determination module is used for determining that the node equipment where the device is located generates a signal degradation alarm;
a type determination module for determining the type of the signal degradation alarm determined by the alarm determination module;
and the alarm processing module is used for controlling the node equipment where the device is located to generate an interface alarm and finish the processing flow when the type determined by the type determination module is a forward error notification (FEI) alarm, and controlling the node equipment where the device is located to perform tunnel switching when the type determined by the type determination module is a degraded Secure Digital (SD) alarm.
A node device comprises a signal degradation processing device, wherein the signal degradation processing device is used for determining the type of a signal degradation alarm generated by the node device when the signal degradation alarm is determined, controlling the node device to generate an interface alarm and finish the processing flow if the determined type is a forward error notification (FEI) alarm, and controlling the node device to perform tunnel switching if the determined type is a degradation Secure Digital (SD) alarm.
According to the scheme provided by the embodiment of the invention, when the processing module determines that the signal degradation alarm is generated in the node, the signal degradation processing can be respectively carried out on the signal degradation alarms of different types according to the types of the signal degradation alarms, if the type is the FEI alarm, an interface alarm is generated and the processing flow is ended, and if the type is the SD alarm, the tunnel switching is carried out, so that the processing aiming at the signal degradation is realized when the signal degradation is generated in the node.
Drawings
Fig. 1 is a schematic flow chart of a signal degradation processing method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a signal degradation processing apparatus according to a second embodiment of the present invention;
FIG. 3 is a diagram illustrating a T-MPLS network model in the prior art;
fig. 4 is a network topology diagram of an application scenario of the signal degradation processing method according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of a signal degradation processing method according to a third embodiment of the present invention;
fig. 6 is a schematic flow chart of a signal degradation processing method according to a fourth embodiment of the present invention;
fig. 7 is a schematic structural diagram of a node device according to a fifth embodiment of the present invention;
fig. 8 is a schematic structural diagram of a node device according to a sixth embodiment of the present invention.
Detailed Description
The technical scheme of the invention is explained by combining the drawings and various embodiments in the specification. Aiming at the problem that the prior art does not have related operation aiming at signal degradation in the process of information transmission by utilizing the T-MPLS technology, the embodiment of the invention provides a processing method aiming at the signal degradation.
The first embodiment,
An embodiment of the present invention provides a method for processing signal degradation, as shown in fig. 1, which is a flowchart of steps of the method, and specifically includes:
step 001, the node equipment determines to generate a signal degradation alarm.
The node device may determine to generate the signal degradation alarm by:
firstly, when detecting that the packet error rate of the span to which the node device belongs is higher than a first set value, the node device determines to generate a signal degradation alarm.
Secondly, the node equipment receives the signal degradation information and determines to generate a signal degradation alarm according to the received signal degradation information.
At step 002, the node device determines the type of signal degradation alarm that is generated.
And step 003, the node equipment performs signal degradation processing.
The method specifically comprises the following steps: if the determined type is the FEI alarm, the node equipment generates an interface alarm and ends the processing flow, and if the determined type is the SD alarm, the node equipment performs tunnel switching.
Example II,
According to the method provided by the first embodiment of the present invention, a second embodiment of the present invention further provides a signal degradation processing apparatus, as shown in fig. 2, which is a schematic structural diagram of the apparatus, and specifically includes:
the alarm determination module 01 is used for determining that the node equipment where the device is located generates a signal degradation alarm; the type determining module 02 is used for determining the type of the signal degradation alarm determined by the alarm determining module; the alarm processing module 03 is configured to control the node device where the apparatus is located to generate an interface alarm and end the processing flow when the type determined by the type determination module is an FEI alarm, and control the node device where the apparatus is located to perform tunnel switching when the type determined by the type determination module is an SD alarm.
The alarm determining module 01 specifically includes:
the detection submodule 011 is used for judging whether the packet error rate of the span section to which the node equipment where the device is positioned belongs is higher than a first set value; the alarm determining submodule 012 is configured to determine that the node device of the apparatus generates a signal degradation alarm when the detection submodule determines that the packet error rate of the span to which the node device belongs is higher than a first set value.
The alarm determination module 01 may further include:
the receiving submodule 013 is configured to receive signal degradation information;
the alarm determining submodule 012 may be further configured to determine, when the receiving submodule receives the signal degradation information, the node device where the apparatus is located to generate a signal degradation alarm according to the received signal degradation information.
According to the prior art, the T-MPLS network model is shown in fig. 3, and includes an application layer (Client Server), a Path layer (TMC, T-MPLS Channel), a Channel layer (TMP, T-MPLS Path), a segment layer (TMS, T-MPLS Section), and an interface layer (PHY MEDIA), which correspond to the Path layer, the Channel layer, the segment layer, and the interface layer, respectively, and one node of the T-MPLS network may include a TMC module, a TMP module, a TMS module, and an interface module. Of course, according to the definition of T-MPLS, the node further includes an OAM module for performing end-to-end operation, management, and maintenance, and the TMP module may include a Tunnel sub-module and a Tunnel Group sub-module. If the node is a non-head node in the tunnel to which the node belongs, the node does not include a TMC layer, and the entity configuration of the TMC module does not exist.
According to the method provided by the first embodiment of the present invention, after signal degradation is generated, signal degradation may be processed in the TMS layer, the TMP layer, and the TMC layer, respectively, in a manner that signal degradation information is reported in the middle layers of the interface layer, the TMS layer, the TMP layer, and the TMC layer of the head node and the non-head node in the tunnel.
Fig. 4 is a network topology diagram of an application scenario of the signal degradation processing method according to an embodiment of the present invention, where the network topology diagram includes switchable working tunnels and protection tunnels (tunnels 1 and 2), and tunnels 1 and 2 are both bidirectional static tunnels.
The Tunnel1 comprises a node 201, a node 202, a node 203 and a node 205, wherein the node 201 and the node 205 are head nodes of the Tunnel1, and the node 202 and the node 203 are non-head nodes of the Tunnel 1; node 201, node 204 and node 205 are included in Tunnel2, where node 201 and node 205 are head nodes of Tunnel2, and node 204 is a non-head node of Tunnel 2. And Tunnel1 includes span 1 between node 201 and node 202, span 2 between node 202 and node 203, and span 3 between node 203 and node 205; tunnel2 includes span 4 between node 201 and node 204, and span 5 between node 204 and node 205.
The manner in which the signal degradation processing is performed by the head node and the non-head node in the tunnel is different. For example, when the signal degradation occurs in span 1 between the node 201 and the node 202 in the Tunnel1, both the node 201 and the node 202 perform the signal degradation processing, and since the node 201 and the node 202 are respectively the head node (node 201) and the non-head node (node 202) in the Tunnel1, the signal degradation processing is performed in different manners between the node 201 and the node 202. The following describes the signal degradation processing method according to the first embodiment of the present invention in detail, taking the node 201 (head node) and the node 202 (non-head node) as examples.
Example III,
A third embodiment of the present invention provides a signal degradation processing method, taking a header node 201 of Tunnel in fig. 4 as an example, where a flow of steps of the method is shown in fig. 5, and the method specifically includes:
In the head node, the processing module may be a TMS module, a TMP module or a TMC module. That is, in the present embodiment, the signal degradation processing device according to the second embodiment is integrated in at least one of the TMS module, the TMP module, and the TMC module. The function of the processing module in the present embodiment may be regarded as a function of the signal degradation processing device. The processing module may determine that a signal degradation alarm is generated by:
firstly, when a detection submodule configured in a processing module detects that the packet error rate of a span to which a node where the processing module is located belongs is higher than a first set value, a signal degradation alarm is determined to be generated.
The reason for the signal degradation is packet loss caused by errors in the line (interface layer, such as optical fiber, copper cable or wireless), and the probability of error occurrence is equal for each bit in each tunnel passing through the line, which is approximately completely random packet loss. Therefore, for packet loss caused by line error code, the error rate of a line corresponding to a span is approximately equal to the error rate of the span in the tunnel. If the average packet length of the line is approximately equal to the average packet length of the tunnel, the packet error rate of the line corresponding to one span is approximately equal to the packet error rate of the span in the tunnel. Therefore, for a node, whether signal degradation is generated at the node can be determined by detecting the packet error rate of the span to which the node belongs.
For example, when two nodes are connected through an ethernet physical port, for each ethernet physical port, a Frame Check Sequence (FCS) may be used to detect whether an error occurs in a packet received by the ethernet physical port, and when the calculated FCS of the received packet is different from the FCS stored in the packet, it may be determined that the error occurs in the packet. At this time, the packet error rate of a span can be determined by the following method:
FCS error packet number detected in t0 period/total packet number received in t0 period
The FCS error packet number comprises an FCS error frame, an overlong frame number and an overlong frame number. the t0 period may be set to 1 second. If the packet error rate is higher than the set ratio r1 in the set t0 period, r1 can be set to 1E-7It is determined that a signal degradation alarm is generated.
Specifically, it may be considered that a first alarm with a lower alarm level, such as a Forward error notification (FEI) alarm, is generated when the packet error rate is higher than the set ratio r1, and r2 may be set to 1 when the packet error rate is higher than the set ratio r2E-6In the following embodiments, the first alarm is taken as an FEI alarm, and the second alarm is taken as an SD alarm, for example, though the second alarm with a higher alarm level, such as a Signal Degrade alarm, is generated.
To implement Tunnel switching, the number of FCS error packets may be detected between any two adjacent nodes of Tunnel1 and Tunnel2 shown in fig. 2, thereby determining whether signal degradation has occurred in each node.
When the proxy module is a TMP module, the TMP module may use a Loss Measurement function (LM) module as a detection sub-module, and carry statistical information of the ethernet physical port (including FCS error packet number detected in t0 period and total packet number received in t0 period) through the LM module, and the TMP OAM sub-module periodically obtains the statistical information and calculates it, thereby determining whether signal degradation occurs in the node.
And secondly, the processing module receives the signal degradation information, and determines that a signal degradation alarm is generated according to the received signal degradation information when the processing module is not provided with a detection submodule.
The signal degradation information may be carried in a FEI message.
The source of the signal degradation information may be any one of the following three sources:
in the first mode, the signal degradation information may be reported by an interface module of a node where the processing module is located. Specifically, when the detection submodule configured in the interface module detects that the packet error rate of the span to which the node where the interface module is located belongs is higher than the second set value, the interface module may determine the corresponding processing module according to its own configuration information, and report the signal degradation information to the determined processing module. If the corresponding processing module configured on the interface module is the TMS module, the determined TMS module reporting the signal degradation information is reported, and if the corresponding processing module configured on the interface module is the TMP module, the determined TMP module reporting the signal degradation information is reported.
And in the second mode, the signal degradation information is reported to the first processing module when the second processing module cannot realize tunnel switching after the second processing module determines the type of the signal degradation alarm.
For example, when the TMS module (the second processing module) cannot implement the tunnel switching, the signal degradation information will be sent to the TMS module (the first processing module).
And in a third mode, the signal degradation information is sent after the OAM module receives the signal degradation information sent by the non-head node in the tunnel, wherein the tunnel is the tunnel to which the node where the processing module is located belongs.
Because the non-head node in the tunnel does not include a TMC layer nor an entity configuration of the TMC module, when the TMP module in the non-head node cannot implement tunnel switching, the OAM module in the non-head node is notified to send signal degradation processing information to the head node in the opposite direction where the alarm occurs in the tunnel to which the non-head node belongs. Specifically, the OAM module in the non-head node sends the signal degradation processing information to the OAM module in the opposite direction head node, and the OAM module in the opposite direction head node may send the signal degradation information to a processing module, such as a TMP module, in the opposite direction head node according to the received signal degradation processing information.
The processing module may determine the type of the signal degradation alarm according to the packet error rate of the span to which the node where the processing module is located belongs. Whether the packet error rate is higher than a set threshold value or not can be judged, if so, the type of the signal degradation alarm can be determined to be an FEI alarm, and if so, the type of the signal degradation alarm can be determined to be an SD alarm, and the first threshold value is smaller than the second threshold value. Of course, threshold values for FEI alarm and SD alarm are necessarily set in the interface module (such as SDH/ETH), TMS module, TMP module, TMC module.
Preferably, when the processing module determines whether a signal degradation alarm is generated according to the FEI message, the type of the signal degradation alarm may be determined according to an alarm type identifier, such as an SD identifier, in the FEI message, and specifically, the SD identifier may be set to 0 to indicate that the type of the signal degradation alarm is the FEI alarm, and the SD identifier is set to 1 to indicate that the type of the signal degradation alarm is the SD alarm.
Specifically, when the processing module is a TMP module, the type of the signal degradation alarm may be determined by a Tunnel sub-module in the TMP module.
And 103, performing signal degradation processing by the processing module according to the type of the signal degradation alarm.
In this step, if the type determined in step 102 is the FEI alarm, the processing module generates an interface alarm and ends the processing flow, and if the type is the SD alarm, the processing module performs tunnel switching.
The Tunnel Group submodule can be set to perform Tunnel switching, and the TMS module is set to send signal degradation information to the TMP module, which includes the following three conditions:
when the processing module is the TMS module, the tunnel switching by the processing module specifically includes:
and the TMS module judges whether the TMS module is in the ring network protection, if so, the TMS module informs a Tunnel Group submodule in the TMP module to carry out Tunnel switching, and finishes the processing flow when the switching is successful, and sends signal degradation information to the TMP module when the switching is failed or the TMS module is determined not to be in the ring network protection.
Secondly, when the processing module is a TMP module, the tunnel switching by the processing module specifically includes:
the Tunnel submodule in the TMP module judges whether the module is in linear Tunnel protection:
if yes, informing the Tunnel Group submodule to carry out Tunnel switching, and finishing the processing flow when the switching is successful;
when the handover fails or it is determined that the Tunnel sub-module is not in the linear Tunnel protection, since the node where the Tunnel sub-module is located is the head node, in this step, the signal degradation information may be sent to the TMC layer.
After receiving the SD alarm, the agent module notifies the Tunnel Group submodule to perform Tunnel switching, which specifically includes: after the agent module receives the SD alarm, it notifies the corresponding switching algorithm module, such as Automatic Protection Switching (APS), and after the switching algorithm module obtains the corresponding switching policy, it notifies the Tunnel Group sub-module to perform Tunnel switching.
Thirdly, when the processing module is a TMC module, the tunnel switching by the processing module specifically includes:
the TMC module informs a Pseudo Wire (PW) redundancy group to perform tunnel switching.
When the Tunnel Group sub-module is set not to perform Tunnel switching, under the first and second conditions, when the TMP module needs to perform Tunnel switching according to the requirement of the TMS module or the requirement of the TMP module, the TMP module sends signal degradation information to the TMC module to request the TMC module to perform Tunnel switching. Specifically, the TMP module may send Service Signal Degradation (SSD) information to the TMC module.
When the processing module determines that a signal degradation alarm is generated according to the received signal degradation information, after step 101 and before step 102, the method may further include:
step 102', the OAM module announces that a signal degradation alarm is being generated.
When the processing module is a TMS module, the method specifically comprises the following steps: and the TMS module informs the OAM module to require the TMS OAM submodule in the OAM module to announce that a signal degradation alarm is generated on the TMS layer.
When the processing module is a TMP module, the method specifically comprises the following steps: the TMP module notifies the OAM module requesting the TMP OAM submodule in the OAM module to announce that a signal degradation alarm is generated at the TMP layer.
When the processing module is a TMC module, the steps specifically include: the TMC module notifies the OAM module requesting the TMC OAM sub-module in the OAM module to announce that a signal degradation alarm is generated at the TMC layer.
According to the method provided by the third embodiment of the present invention, when a head node in a tunnel is degraded, the TMS module, the TMP module, and the TMC module of the tunnel can be used to implement signal degradation processing, and corresponding signal degradation processing can be performed according to the type of a signal degradation alarm. The third embodiment of the invention also provides a plurality of modes for determining the generation of the signal degradation alarm. And the OAM module in the third embodiment of the present invention may also notify the signal degradation alarm generated in each layer.
Example four,
A fourth embodiment of the present invention provides a signal degradation processing method, taking a non-head node 202 of Tunnel in fig. 4 as an example, where a flow of steps of the method is shown in fig. 6, and specifically includes:
in step 201, the processing module determines that a signal degradation alarm is generated.
In the non-head node, the processing module may be a TMS module or a TMP module, that is, in the present embodiment, the TMS module and/or the TMP module is integrated with the signal degradation processing device related to the second embodiment. The function of the processing module in the present embodiment may be regarded as a function of the signal degradation processing device.
The manner of determining that the signal degradation alarm is generated by the processing module is the same as the manner described in step 101 of the embodiment, and is not described herein again.
In step 202, the processing module determines the type of the signal degradation alarm.
The method for determining the type of the signal degradation alarm by each processing module in this embodiment is the same as the method described in step 102 in this embodiment, and is not described herein again.
The specific method for performing tunnel switching by the TMS module is the same as the specific method for performing tunnel switching by the TMS module in step 103 of the embodiment, and is not described herein again.
The Tunnel Group sub-module can be set to perform Tunnel switching, and the Tunnel switching performed by the TMP module specifically includes:
the Tunnel submodule in the TMP module judges whether the module is in linear Tunnel protection:
if yes, informing the Tunnel Group submodule to carry out Tunnel switching, and finishing the processing flow when the switching is successful;
when the switching fails or the Tunnel submodule is determined not to be in the linear Tunnel protection, because the node where the Tunnel submodule is located is the non-head node, in this step, the OAM module may be notified to send the signal degradation processing information to the head node in the opposite direction where the alarm occurs in the Tunnel to which the non-head node belongs, and the relevant module in the head node is required to perform the Tunnel switching operation. When the non-head node is node 202, if the direction in which the alarm occurs in Tunnel1 is node 201 to node 205, node 202 may send signal degradation processing information to node 205.
When it is set that the Tunnel Group sub-module cannot perform Tunnel switching, and when the TMP module needs to perform Tunnel switching according to the requirement of the TMS module or according to the requirement of the TMP module itself, the OAM module may be notified to send signal degradation processing information to the head node in the opposite direction where the alarm occurs in the Tunnel to which the non-head node belongs, and a relevant module in the head node is required to perform Tunnel switching operation. Specifically, the TMP module may transmit the signal degradation processing information to the TMC module through the SSD information.
The non-head node may transmit the signal degradation information to the designated head node at a set period t1, and the default value of t1 may be 1 second, or may be set to transmit the signal degradation processing information to the designated head node when the handover fails or it is determined that the Tunnel sub-module is not under linear Tunnel protection.
When a non-head node transmits signal degradation processing information to a designated head node at a set period t1, the effective time of the signal degradation processing information in the head node may be 3 × t1, that is, within the time of 3 × t1, if the head node does not receive the signal degradation processing information retransmitted by the non-head node, the head node may perform signal degradation processing based on the signal degradation processing information received last time, and if the signal degradation processing information retransmitted by the non-head node is not received beyond the time of 3 × t1, the head node may regard that the signal degradation of the non-head node is disappeared and generate a notification that a corresponding signal degradation alarm is disappeared.
When the processing module determines that a signal degradation alarm is generated according to the received signal degradation information, after step 201 and before step 202, the method may further include:
step 202', the OAM module announces that a signal degradation alarm is being generated.
The method for generating the signal degradation alarm notification by the OAM module in this step for each processing module in this embodiment is the same as that in step 102' in the first embodiment, and is not described herein again.
According to the method provided by the fourth embodiment of the present invention, when signal degradation occurs in a non-head node in a tunnel, signal degradation processing may be performed by using the TMS module and the TMP module in the non-head node, and when signal degradation processing cannot be completed by itself, signal degradation processing may be performed by using a head node that is in the same tunnel as the non-head node and has an opposite direction to an alarm direction.
The invention provides the following node devices based on the same inventive concept as the third embodiment and the fourth embodiment.
Example V,
A fifth embodiment of the present invention provides a node device, which corresponds to the function of the head node in the third embodiment, as shown in fig. 7, the node device includes a path layer TMC module 11, a channel layer TMP module 12, a segment layer TMS module 13, an interface module 14, and an operation, administration, and maintenance OAM module 15, and any one of the TMC module 11, the TMP module 12, and the TMS module 13 may be used as a processing module:
and the processing module is used for determining that the signal degradation alarm is generated, determining the type of the signal degradation alarm, generating an interface alarm and ending the processing flow if the type is a first alarm, and switching the tunnel if the type is a second alarm.
The processing module may be configured with a detection sub-module:
and the detection submodule configured in the processing module is used for determining that a signal degradation alarm is generated when the packet error rate of the span to which the node where the processing module is located belongs is higher than a first set value.
The processing module is specifically configured to receive the signal degradation information, and determine that a signal degradation alarm is generated according to the received signal degradation information when the processing module is not configured with the detection sub-module.
The processing module is specifically configured to receive signal degradation information reported by the interface module, where the signal degradation information is reported by the interface module according to the configuration information of the interface module when the detection submodule configured by the interface module detects that the packet error rate of the span to which the node where the interface module is located belongs is higher than a second set value; or,
the processing module is specifically configured to receive signal degradation information reported by other processing modules, where the signal degradation information is reported by other processing modules when the other processing modules cannot realize tunnel switching after the other processing modules determine the type of the signal degradation alarm; or,
the processing module is specifically configured to receive the signal degradation information reported after the OAM module receives the signal degradation processing information sent by the non-head node in the tunnel.
The OAM module 15 may include a TMS OAM sub-module 151, a TMP OAM sub-module 152, and a TMC OAM sub-module 153. The TMP module 12 includes a Tunnel Group sub-module 121 and a Tunnel sub-module 122.
The TMS module 13 is further configured to notify the OAM module, and request the TMS OAM submodule in the OAM module to notify that a signal degradation alarm is generated in the TMS layer.
The TMS module 13 is further configured to determine whether the TMS module is in ring network protection, and if the TMS module is in ring network protection, notify the Tunnel Group submodule in the TMP module to perform Tunnel switching, and end the processing flow when the switching is successful, and send signal degradation information to the TMP module when the switching is failed or it is determined that the TMS module is not in ring network protection.
The TMS module 13 is further configured to require the TMC module to perform tunnel switching.
A Tunnel sub-module 122 for determining the type of signal degradation alarm.
The TMP module 12 is further configured to notify the OAM module to request the TMP OAM submodule in the OAM module to notify that a signal degradation alarm is generated at the TMP layer.
The Tunnel sub-module 122 is configured to determine whether itself is in linear Tunnel protection, and if so, notify the Tunnel Group sub-module to perform Tunnel switching, end the processing flow when the switching is successful, and send signal degradation information to the TMC module when the switching is failed or it is determined that itself is not in linear Tunnel protection.
The TMP module 12 is further configured to request the TMC module to perform tunnel switching.
The TMC module 11 is further configured to notify the OAM module, and request the TMC OAM submodule in the OAM module to notify that a signal degradation alarm is generated at the TMC layer.
The TMC module 11 is further configured to notify a pseudo wire redundancy group to perform tunnel switching.
The OAM module 15 is configured to report signal degradation information according to the signal degradation processing information received within a set time length.
Example six,
A sixth embodiment of the present invention provides a node device, which corresponds to the function of the non-head node in the fourth embodiment, as shown in fig. 8, the node device includes a channel layer TMP module 21, a segment layer TMS module 22, an interface module 23, and an operation, administration, and maintenance OAM module 24, and any one of the TMP module 21 and the TMS module 22 may be used as a processing module:
and the processing module is used for determining that the signal degradation alarm is generated, determining the type of the signal degradation alarm, generating an interface alarm and ending the processing flow if the type is a first alarm, and switching the tunnel if the type is a second alarm.
The TMP module 21 includes a Tunnel Group sub-module 211 and a Tunnel sub-module 212;
and the Tunnel sub-module 212 is configured to determine whether the Tunnel sub-module is in linear Tunnel protection, notify the Tunnel Group sub-module to perform Tunnel switching if the Tunnel sub-module is in linear Tunnel protection, end the processing flow when the switching is successful, and notify the OAM module to send signal degradation processing information to the head node device in the opposite direction where the alarm occurs in the Tunnel to which the node device belongs when the switching is failed or the Tunnel sub-module is determined not to be in linear Tunnel protection.
The TMP module 21 is further configured to notify the OAM module to send signal degradation processing information to the head node device in the opposite direction where the alarm occurs in the tunnel to which the node device belongs.
The OAM module 24 may include a TMS OAM submodule 241 and a TMP OAM submodule 242.
Other modules in this embodiment have the same functions as corresponding modules in the node device provided in the fifth embodiment, and are not described herein again.
The node devices provided in the fifth and sixth embodiments of the present invention may be two independent devices, and corresponding function modules provided in the fifth and sixth embodiments may be integrated into one node device, so that the node device may be used as a head node or a non-head node in a tunnel.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (19)
1. A signal degradation processing method, characterized by comprising:
the node equipment determines to generate a signal degradation alarm; and
determining a type of the generated signal degradation alarm;
if the determined type is a forward error notification FEI alarm, the node equipment generates an interface alarm and ends the processing flow, and if the determined type is a degraded SD alarm, the node equipment performs tunnel switching.
2. The method of claim 1, wherein the node device determines to generate the signal degradation alarm by:
and when detecting that the packet error rate of the span to which the node equipment belongs is higher than a first set value, the node equipment determines to generate a signal degradation alarm.
3. The method of claim 1, wherein the node device determines to generate the signal degradation alarm by:
the node device receives the signal degradation information, and
and determining to generate a signal degradation alarm according to the received signal degradation information.
4. A signal degradation processing apparatus, characterized by comprising:
the alarm determination module is used for determining that the node equipment where the device is located generates a signal degradation alarm;
a type determination module for determining the type of the signal degradation alarm determined by the alarm determination module;
and the alarm processing module is used for controlling the node equipment where the device is located to generate an interface alarm and finish the processing flow when the type determined by the type determination module is a forward error notification (FEI) alarm, and controlling the node equipment where the device is located to perform tunnel switching when the type determined by the type determination module is a degraded Secure Digital (SD) alarm.
5. The apparatus of claim 4, wherein the alarm determination module specifically comprises:
the detection submodule is used for judging whether the packet error rate of the span to which the node equipment where the device is located belongs is higher than a first set value;
and the alarm determining submodule is used for determining that the node equipment where the device is located generates a signal degradation alarm when the detection submodule judges that the packet error rate of the span to which the node where the device is located belongs is higher than a first set value.
6. The apparatus of claim 4, wherein the alarm determination module specifically comprises:
a receiving submodule for receiving signal degradation information;
and the alarm determining submodule is used for determining the node equipment where the device is positioned to generate a signal degradation alarm according to the received signal degradation information when the receiving submodule receives the signal degradation information.
7. A node device is characterized by comprising a signal degradation processing device, wherein the signal degradation processing device is used for determining the type of a signal degradation alarm generated by the node device when the node device is determined to generate the signal degradation alarm, controlling the node device to generate an interface alarm and finish the processing flow if the determined type is a forward error notification (FEI) alarm, and controlling the node device to perform tunnel switching if the determined type is a degraded Secure Digital (SD) alarm.
8. The node device of claim 7, wherein a detection sub-module is configured in the signal degradation processing apparatus:
and the signal degradation processing device is specifically configured to determine that the node device generates a signal degradation alarm when the detection sub-module detects that the packet error rate of the span to which the node device belongs is higher than a first set value.
9. The node apparatus of claim 7,
the signal degradation processing device is specifically configured to receive signal degradation information, and determine that the node device generates a signal degradation alarm according to the received signal degradation information.
10. The node device of claim 9, wherein the signal degradation processing apparatus is specifically configured to receive signal degradation information reported by an interface module in the node device, where the signal degradation information is reported by the interface module according to configuration information of the interface module when a detection submodule configured by the interface module detects that the packet error rate of the span to which the node device belongs is higher than a second set value; or
The node equipment comprises at least two signal degradation processing devices, wherein a first signal degradation processing device is specifically used for receiving signal degradation information reported by a second signal degradation processing device, and the signal degradation information is reported when the first signal degradation processing device cannot realize tunnel switching after the second signal degradation processing device determines the type of a signal degradation alarm; or
The signal degradation processing device is specifically configured to receive signal degradation information reported by an operation, administration and maintenance OAM module in the node device after receiving the signal degradation processing information sent by the non-head node device in the tunnel.
11. The node apparatus of claim 7, wherein the signal degradation processing means is integrated in a segment-level TMS module in the node apparatus:
the signal degradation processing device is further configured to notify an OAM module in the node device, and instruct a TMS OAM submodule in the OAM module to notify that a signal degradation alarm is generated in a TMS layer.
12. The node device of claim 7, wherein the signal degradation processing means is integrated in a TMS module in the node device:
the signal degradation processing device is further configured to determine whether the TMS module is in ring network protection, if so, notify a Tunnel Group sub-module in a channel layer TMP module in the node device to perform Tunnel switching, end the processing flow when the switching is successful, and send signal degradation information to the TMP module when the switching is failed or it is determined that the TMS module is not in ring network protection.
13. The node device of claim 7, wherein the signal degradation processing means is integrated in a TMS module in the node device:
the signal degradation processing device is further configured to request a tunnel switching of a tunnel layer TMC module in the node device.
14. The node device of claim 9, wherein the signal degradation processing means is integrated in a TMP module in the node device:
and the signal degradation processing device is further used for informing an OAM module in the node equipment, and indicating a TMP OAM sub-module in the OAM module to inform that a signal degradation alarm is generated at a TMP layer.
15. The node device of claim 7, wherein the signal degradation processing means is integrated in a TMP module in the node device:
and the signal degradation processing device is used for judging whether the Tunnel sub-module in the TMP module is in linear Tunnel protection, if so, informing the Tunnel Group sub-module in the TMP module to carry out Tunnel switching, ending the processing flow when the switching is successful, and sending signal degradation information to the TMC module when the switching is failed or the Tunnel sub-module is determined not to be in linear Tunnel protection.
16. The node device of claim 7, wherein the signal degradation processing means is integrated in a TMP module in the node device:
and the signal degradation processing device is also used for requiring the TMC module to perform tunnel switching.
17. The node device of claim 9, wherein the signal degradation processing means is integrated in a TMC module in the node device:
the signal degradation processing device is further configured to notify an OAM module in the node device, and instruct a TMC OAM submodule in the OAM module to notify that a signal degradation alarm is generated at a TMC layer.
18. The node device of claim 7, wherein the signal degradation processing means is integrated in a TMC module in the node device:
the signal degradation processing device is also used for informing the pseudo wire redundancy group to carry out tunnel switching.
19. The node device of claim 10, wherein the signal degradation processing means is specifically configured to determine that the node device generates a signal degradation alarm according to signal degradation processing information reported by the OAM module within a set time duration.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101525319A CN102215127A (en) | 2011-06-08 | 2011-06-08 | Signal degrade processing method, device and node equipment |
| PCT/CN2012/073934 WO2012167667A1 (en) | 2011-06-08 | 2012-04-12 | Signal degradation processing method, device and node device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101525319A CN102215127A (en) | 2011-06-08 | 2011-06-08 | Signal degrade processing method, device and node equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102215127A true CN102215127A (en) | 2011-10-12 |
Family
ID=44746266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101525319A Pending CN102215127A (en) | 2011-06-08 | 2011-06-08 | Signal degrade processing method, device and node equipment |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102215127A (en) |
| WO (1) | WO2012167667A1 (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012167667A1 (en) * | 2011-06-08 | 2012-12-13 | 中兴通讯股份有限公司 | Signal degradation processing method, device and node device |
| CN103001819A (en) * | 2011-09-19 | 2013-03-27 | 盛科网络（苏州）有限公司 | Method and system for processing OAM (operation, administration and maintenance) detecting results in MPLS-TP (multiple protocol label switching-transmission parameter) network |
| CN104734865A (en) * | 2013-12-18 | 2015-06-24 | 中国移动通信集团贵州有限公司 | Network protection method for PTN (Packet Transport Network), device and network element device |
| WO2016033870A1 (en) * | 2014-09-02 | 2016-03-10 | 中兴通讯股份有限公司 | Tunnel signal degradation notifying and switching method and apparatus, and computer storage medium |
| CN105634844A (en) * | 2014-10-31 | 2016-06-01 | 中兴通讯股份有限公司 | Method and device for carrying out signal degradation state detection in PTN (Packet Transport Network) |
| WO2016169214A1 (en) * | 2015-04-21 | 2016-10-27 | 中兴通讯股份有限公司 | Tunnel protection switching method and device |
| CN107666437A (en) * | 2016-07-27 | 2018-02-06 | 中兴通讯股份有限公司 | A kind of static tunnel restoration method, apparatus and network node |
| CN108234156A (en) * | 2016-12-13 | 2018-06-29 | 北京华为数字技术有限公司 | The method and apparatus of transmitting message |
| CN109951322A (en) * | 2019-02-26 | 2019-06-28 | 盛科网络（苏州）有限公司 | A kind of method and device for realizing that OAM alarm inhibits based on chip |
| CN110011819A (en) * | 2018-01-04 | 2019-07-12 | 中兴通讯股份有限公司 | Generate method, apparatus, equipment and the system of SD warning information |
| CN111865785A (en) * | 2020-06-28 | 2020-10-30 | 烽火通信科技股份有限公司 | SR-TP tunnel signal transmission method, device, server and storage medium |
| WO2021047483A1 (en) * | 2019-09-09 | 2021-03-18 | 中国移动通信有限公司研究院 | Protection switching method, node device and storage medium |
| EP3687114A4 (en) * | 2017-09-22 | 2021-06-02 | ZTE Corporation | Handling method, system, device and storage medium for signal degradation failure |
| CN112995024A (en) * | 2019-12-02 | 2021-06-18 | 中兴通讯股份有限公司 | Signal degradation warning method, system, terminal device and storage medium |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110690983B (en) * | 2018-07-05 | 2022-04-08 | 中兴通讯股份有限公司 | Alarm method, alarm device and computer readable storage medium |
| CN110266521B (en) * | 2019-05-30 | 2022-12-09 | 深圳市中航比特通讯技术股份有限公司 | SPTN network service guarantee method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6993700B1 (en) * | 2000-12-22 | 2006-01-31 | Applied Micro Circuits Corporation | System and method for generating forward error correction based alarms |
| CN1848844A (en) * | 2005-11-17 | 2006-10-18 | 华为技术有限公司 | Method and apparatus for realizing group protection in MPLS network |
| CN101145871A (en) * | 2006-09-12 | 2008-03-19 | 中兴通讯股份有限公司 | Method for reducing erroneous alarm generation sequence in SDH service |
| CN101414937A (en) * | 2008-11-28 | 2009-04-22 | 中兴通讯股份有限公司 | Method and apparatus for switching tunnel |
| CN101719843A (en) * | 2009-12-18 | 2010-06-02 | 烽火通信科技股份有限公司 | Method of LSP linear protection switching in PTN |
| CN101741631A (en) * | 2008-11-17 | 2010-06-16 | 华为技术有限公司 | An alarm and performance monitoring method and network node |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102215127A (en) * | 2011-06-08 | 2011-10-12 | 中兴通讯股份有限公司 | Signal degrade processing method, device and node equipment |
-
2011
- 2011-06-08 CN CN2011101525319A patent/CN102215127A/en active Pending
-
2012
- 2012-04-12 WO PCT/CN2012/073934 patent/WO2012167667A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6993700B1 (en) * | 2000-12-22 | 2006-01-31 | Applied Micro Circuits Corporation | System and method for generating forward error correction based alarms |
| CN1848844A (en) * | 2005-11-17 | 2006-10-18 | 华为技术有限公司 | Method and apparatus for realizing group protection in MPLS network |
| CN101145871A (en) * | 2006-09-12 | 2008-03-19 | 中兴通讯股份有限公司 | Method for reducing erroneous alarm generation sequence in SDH service |
| CN101741631A (en) * | 2008-11-17 | 2010-06-16 | 华为技术有限公司 | An alarm and performance monitoring method and network node |
| CN101414937A (en) * | 2008-11-28 | 2009-04-22 | 中兴通讯股份有限公司 | Method and apparatus for switching tunnel |
| CN101719843A (en) * | 2009-12-18 | 2010-06-02 | 烽火通信科技股份有限公司 | Method of LSP linear protection switching in PTN |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012167667A1 (en) * | 2011-06-08 | 2012-12-13 | 中兴通讯股份有限公司 | Signal degradation processing method, device and node device |
| CN103001819A (en) * | 2011-09-19 | 2013-03-27 | 盛科网络（苏州）有限公司 | Method and system for processing OAM (operation, administration and maintenance) detecting results in MPLS-TP (multiple protocol label switching-transmission parameter) network |
| CN103001819B (en) * | 2011-09-19 | 2015-01-21 | 盛科网络（苏州）有限公司 | Method and system for processing OAM (operation, administration and maintenance) detecting results in MPLS-TP (multiple protocol label switching-transmission parameter) network |
| CN104734865A (en) * | 2013-12-18 | 2015-06-24 | 中国移动通信集团贵州有限公司 | Network protection method for PTN (Packet Transport Network), device and network element device |
| WO2016033870A1 (en) * | 2014-09-02 | 2016-03-10 | 中兴通讯股份有限公司 | Tunnel signal degradation notifying and switching method and apparatus, and computer storage medium |
| CN105471736A (en) * | 2014-09-02 | 2016-04-06 | 中兴通讯股份有限公司 | Tunnel signal degradation notifying and switching methods and devices |
| CN105634844A (en) * | 2014-10-31 | 2016-06-01 | 中兴通讯股份有限公司 | Method and device for carrying out signal degradation state detection in PTN (Packet Transport Network) |
| CN106161232B (en) * | 2015-04-21 | 2020-01-31 | 中兴通讯股份有限公司 | tunnel protection switching method and device |
| WO2016169214A1 (en) * | 2015-04-21 | 2016-10-27 | 中兴通讯股份有限公司 | Tunnel protection switching method and device |
| CN106161232A (en) * | 2015-04-21 | 2016-11-23 | 中兴通讯股份有限公司 | A kind of method and apparatus of protecting tunnel switching |
| CN107666437A (en) * | 2016-07-27 | 2018-02-06 | 中兴通讯股份有限公司 | A kind of static tunnel restoration method, apparatus and network node |
| CN108234156A (en) * | 2016-12-13 | 2018-06-29 | 北京华为数字技术有限公司 | The method and apparatus of transmitting message |
| CN108234156B (en) * | 2016-12-13 | 2021-04-09 | 北京华为数字技术有限公司 | Method and equipment for transmitting message |
| EP3687114A4 (en) * | 2017-09-22 | 2021-06-02 | ZTE Corporation | Handling method, system, device and storage medium for signal degradation failure |
| CN110011819A (en) * | 2018-01-04 | 2019-07-12 | 中兴通讯股份有限公司 | Generate method, apparatus, equipment and the system of SD warning information |
| CN109951322A (en) * | 2019-02-26 | 2019-06-28 | 盛科网络（苏州）有限公司 | A kind of method and device for realizing that OAM alarm inhibits based on chip |
| WO2021047483A1 (en) * | 2019-09-09 | 2021-03-18 | 中国移动通信有限公司研究院 | Protection switching method, node device and storage medium |
| CN112995024A (en) * | 2019-12-02 | 2021-06-18 | 中兴通讯股份有限公司 | Signal degradation warning method, system, terminal device and storage medium |
| CN111865785A (en) * | 2020-06-28 | 2020-10-30 | 烽火通信科技股份有限公司 | SR-TP tunnel signal transmission method, device, server and storage medium |
| CN111865785B (en) * | 2020-06-28 | 2022-04-29 | 烽火通信科技股份有限公司 | SR-TP tunnel signal transmission method, device, server and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012167667A1 (en) | 2012-12-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102215127A (en) | Signal degrade processing method, device and node equipment | |
| US10721139B2 (en) | Protection switching systems and methods in a packet network based on signal degrade | |
| EP1845656B1 (en) | A method for implementing master and backup transmission path | |
| EP1111860B1 (en) | Automatic protection switching using link-level redundancy supporting multi-protocol label switching | |
| US9485181B2 (en) | Dynamic bandwidth adjustment in packet transport network | |
| US7660236B2 (en) | System and method of multi-nodal APS control protocol signaling | |
| US9451500B2 (en) | Conditional routing technique | |
| EP2204947A1 (en) | Method and node device of ethernet failure detecting and converging | |
| CN105281931B (en) | Bit error detection method, the apparatus and system of POTN | |
| WO2019057211A1 (en) | Handling method, system, device and storage medium for signal degradation failure | |
| US10250492B2 (en) | Segment recovery in connection-oriented network | |
| JP2012527808A (en) | Method of signal transmission of data transmission path characteristics to non-OAM observation (OBSERVENT) client | |
| US6848062B1 (en) | Mesh protection service in a communications network | |
| JP2012527808A5 (en) | ||
| CN107431655B (en) | Method and apparatus for fault propagation in segmentation protection | |
| WO2015120720A1 (en) | Signal degradation failure processing method and system | |
| JP5113124B2 (en) | Fault monitoring system in packet network | |
| WO2012100571A1 (en) | Centralized management method and system for multiple tunnels with the same path | |
| WO2008095390A1 (en) | An equipment for detecting the line fault of the pseudo wire emulation and a method thereof | |
| EP3139527A1 (en) | Protection switching method, node and control device | |
| CN107465527B (en) | Network element, protection switching method and system thereof | |
| Kim et al. | OAM and protection mechanisms for MPLS-TP packet transport networks | |
| Yun et al. | Technique analysis of t-mpls oam and mpls-tp oam | |
| CN102957557A (en) | Group protection method and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20111012 |