KR100901700B1 - Method for tandem connection monitoring the mpls network - Google Patents

Abstract

The present invention relates to a TCM method and a data structure of an MPLS OAM packet for a TCM in an MPLS network. When provided to a user via a network provider, the performance of the LSP can be measured independently at the user level, service provider level, and network provider level. Not only can the performance of the network be measured in advance, but the quality of the input signal can be determined, and the quality of the network can be newly measured regardless of the quality of the previous network.

MPLS, TCM (TANDEM CONNECTION MONITORING), BIP-16, BIP-8

Description

TCM method in MPS network {METHOD FOR TANDEM CONNECTION MONITORING THE MPLS NETWORK}

The present invention relates to the TCM technology in the MPLS network, and in particular, a problem occurs so that the responsibility of the LSP can be clarified in case of a performance degradation or a failure of the LSP by newly measuring the quality in its own network regardless of the quality of the previous network. The present invention relates to a TCM method in an MPLS network that can find the exact location of an area.

The present invention is derived from the research conducted as part of the IT new growth engine core technology development project of the Ministry of Information and Communication and the Ministry of Information and Communication Research and Development. [Task management number: 2006-S-064-01 Project name: BcN network engineering technology research].

TCM technology has been applied mainly to the Optical Trnasport Hierarchy (OTH) device, which is a light transmission network device. This technology can monitor performance at user level, service provider level and network provider level, respectively, and there are 6 levels of TCM (Tandem Connection Monitroing). TCM1 is used by the user, TCM2 is used by the service provider, and the remaining TCM3-TCM6 is used by the network provider.

The OTH device is composed of optical and digital levels, especially the TCM function in the digital level. The digital hierarchy consists of an optical channel transport unit (OTU), an optical channel data unit (ODU) and an optical channel payload unit (OPU). The TCM information is carried in the overhead of the ODU and consists of a total of 18 bytes, 3 bytes per TCM. In case of OTH, Identifier TTSI (Trail Termination Source Identifier) value for the section to be monitored is stored in TCM independently so that each section can be monitored by user level, service provider level and network provider level.

On the other hand, as a method for measuring performance in the TCM, a parity error check method is used, and a transmitter calculates parity for an optical channel payload unit (OPU), which is an ODU payload, using BIP-8 (Byte Interleaved Parity 8). The result is then transmitted with the BIP-8 value in the corresponding TCM byte of the next frame. On the other hand, the TCM receiver calculates the parity for the received OPU and measures the performance by comparing the BIP-8 value stored at the transmitter in the TCM using the TCM carried in the next frame. In this way, each network provider, service provider and user can independently monitor the performance of the desired section.

However, in the MPLS network, which is a packet network, when an error occurs in a specific provider network when a service provider provides a label switched path (LSP) to a user through a plurality of network providers, the user But service provider (Service Provider) is difficult to find where the performance degradation occurred.

Therefore, in case of existing MPLS technology, it is difficult to find out when performance degradation occurs in a specific provider network or performance degradation between service providers on the user side, so it is easy to find the network and provide the cause of performance degradation. We need a way to pinpoint the location of.

In order to solve the above problems, when the performance degradation occurs in MPLS LSP using frame format such as CV (Connectivity Verification) or FFD (Fast Failure Detection) packet among MPLS OAM packets recommended in ITU-T Y.1711. In addition to monitoring performance degradation at the user level, service provider level, and network provider level, there is a need for a means of pinpointing where they occur.

In order to meet the above needs, the TCM method in the MPLS network of the present invention uses the MPLS OAM packet in the TCM method of the MPLS network,

Step 1 of calculating a BIP-16 parity of a received TCM packet, stored in the calculated BIP-16 parity and the received TCM packet. Step 2 of determining whether there is an error by comparing BIP-16 parakeys, and setting 0 or 1 to an IE area allocated to a service provider level according to the determination result. In step 4, the BIP-8 parity of the received packet is calculated and stored in a Service Provider TCM BIP-8 field of the received packet. When this is completed, it comprises the five steps of transmitting the packet at the Service Provider (Service Provider) level.

As described above, according to the present invention, the TCM method in the MPLS network according to the present invention allows the user or the neighboring network provider network to know the cause of the occurrence of the performance degradation in a specific network provider network. It can easily track the location of the network that caused the performance degradation and is based on the Service Level Agreement (SLA) agreed between the user and the service provider and between the service provider and the network provider. There is an effect that can be used to clarify the payment criteria and accountability.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in describing in detail the operating principle of the preferred embodiment of the present invention, if it is determined that the detailed description of the related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In addition, the same reference numerals are used for parts having similar functions and functions throughout the drawings.

1 is a diagram showing the structure of an MPLS TCM packet using the "Reserved" byte of the ITU-T, Y.1711 MPLS OAM packet according to the present invention.

Referring to FIG. 1, the CV packet of the MPLS OAM packet utilizes 3 bytes reserved for future use as bytes for Tandem Connection Monitoring (TCM). Hereinafter, a detailed frame structure of the MPLS OAM packet for the TCM will be described.

In the CV packet of the MPLS OAM packet, the function type code point field 110 is composed of 1 byte to indicate the performance of the packet. In ITU-T Y.1711, 00 to 07 Hex values are defined and used. . Therefore, 08Hex is additionally defined and used to indicate a function of performing the TCM according to the present invention.

In order to use the "reserved" 3 byte 120 as a TCM function, 1 byte 121 is used for BIP-8 parity check of a service provider, and the other 1 byte 122 is a network provider. Used to check BIP-8 parity of (Network Provider). In order to indicate whether or not an Incoming Error (IE) is caused by each check, one bit (123, 124) is allocated for the Incoming Error (IE) by one bit from the remaining 1 byte.

The remaining 40 bytes of the CV packet use the recommendations of Y.1711 without modification.

2 is a diagram illustrating a TCM monitoring interval for a user level, a service provider level, and a network provider level for an MPLS LSP according to the present invention.

2 shows a Tandem Connection Monitoring (TCM) section for each level.

A user TCM 201 is defined between the customer equipment (200) and the CE (210) for monitoring the subscriber interval, and a service provider between the provider equipment (220) and the PE (230). (Service Provider) The PE (220), PE (221), PE (222) to monitor the TCM (202) and the failure and performance by each network operator to search for which provider network failure and performance degradation occurred. And between the PE 223 and the PE 224 and the PE 230 define network provider TNP A 203, NP TCM B 204 and NP TCM C 205, respectively.

And, the location for performing Tandem Connection Monitoring (TCM) is the TCM point 241 and the PE (230) and CE (210) between the CE (200) and PE (220) between the subscriber device and the network provider (Network Provider) device At the TCM point 244 between. In addition, in order to perform Tandem Connection Monitoring (TCM) for each provider network, the TCM point 242 and the TCM point 243 between each provider network are performed.

3 is a diagram illustrating a configuration for operating a TCM at a user level according to the present invention.

Referring to FIG. 3, for Tandem Connection Monitoring (TCM) in terms of MPLS LSP user, a packet having a structure of an MPLS TCM packet defined in detail by FIG. 1 is generated. In the MPLS TCM payload structure, the function type field 301 newly defines and stores 08Hex indicating that the MPLS OAM packet is a TCM function. The LSP TTSI 306 stores the address for the CE A 300 (where the address system is in accordance with ITU-T Y.1711), and the BIP-16 308 calculates and stores the following.

padding(307)BIP-16 = LSP TTSI (306)

padding (307)

In order to operate a user level TCM using the MPLS TCM packet configured as described above, a TCM frame is inserted into CE A 300, which is a subscriber device, and extracted and received by CE B 310. The byte parity is calculated for the received frame, and the difference is calculated by comparing the BIP-16 values transmitted from the transmitter CE A 300.

As a result, if failure and performance degradation do not occur in the network providers Network NP A 320, NP B 321 and NP C 322, the BIP-16 value calculated by CE B 310 and The BIP-16 value loaded in the TCM frame will have the same value. However, in the case of failure and performance degradation in the network NP A 320, NP B 321 and NP C 322, the two values are different, which results in NP A, B, and C (Network Provider, 320, 321). In addition, it is possible to monitor at the user level that a failure or performance degradation has occurred in the network.

4 is a diagram illustrating a configuration for operating a TCM at a service provider level according to the present invention.

The service provider leases the network to the network provider and provides the subscriber with the MPLS LSP. In this regard, the TCM at the service provider level is achieved by monitoring between the PE A 220 and the PE B 230, which are service provider intervals.

The PE A 220 stores information required for the BIP-8 302 and the Incoming Error (IE) 304 allocated to the Service Provider TCM in the TCM packet frame received from the CE A 300, respectively. . PE B 310 monitors the performance of the service provider interval by checking the BIP-8 value and IE bit stored in PE A 220. In this case, as shown in FIG. 1, the BIP-8 302 is allocated 1 octet for the service provider TCM, and the IE (Incoming Error, 304) is allocated as 1 bit.

At the Service Provider level, the TCM is first performed at PE A 220. In detail, the PE A 220 checks an error for the TCM packet received from the CE A 300. In this case, the error detection method is performed in the same manner as in the user level TCM operating method described with reference to FIG. 2.

First, BIP-16 is calculated from the received packet. BIP-16 works in the following way.

padding(307)BIP-16 = LSP TTSI (306)

padding (307)

When the BIP-16 of the received packet is calculated, the calculated value is compared with the BIP-16 308 stored in the received packet to determine whether the values are the same.

If the two values are the same as the result of the determination, the error does not occur, and "0" is stored in the IE bit 304 allocated for the service provider. If the two values are different, the error is determined. Is stored in the IE bit 304. If the error is determined using the BIP-16 value, and the " 0 " or " 1 " is stored in the IE bit 304, the BIP-8 is calculated. BIP-8 stores the value in a packet to see if an error occurs in the service provider TCM 202.

The BIP-8 is calculated by the following method, and the calculated value is stored in the service provider TCM BIP-8 302 of the packet.

LSP TTSI(306)

padding(307)+BIP-16(308)BIP-8 = Function type (08Hex) (301)

LSP TTSI (306)

padding (307) + BIP-16 (308)

When the service provider TCM BIP-8 302 of the packet is stored as described above, the packet is transmitted.

Meanwhile, the PE B 230 receives a TCM packet transmitted through the network provider network. When the TCM packet is received, it retrieves the IE bit 304 allocated for the service provider. If the value stored in the IE bit 304 is "1", it is determined that an error occurs before the packet is received by the service provider.

If the value stored in the IE bit 304 is "0", it is determined that there was no error before the current service provider.

LSP TTSI(306)

padding(307)

BIP-16(308)에 의해 이루어지고, 이렇게 구해진 값을 이용해 수신된 패킷의 서비스 제공자(Service Provider) TCM BIP-8(302)에 저장된 값과 비교한다. After the determination of the IE bit is performed, the BIP-8 for the received TCM packet is calculated. The calculation of BIP-8 is BIP-8 = Function type (08Hex) (301).

LSP TTSI (306)

padding (307)

The value obtained by the BIP-16 308 and thus obtained is compared with the value stored in the service provider TCM BIP-8 302 of the received packet.

If two BIP-8 values are the same, two cases may be determined by dividing. First, when the value of the IE value 304 is "0", it is a case in which an error-free packet is received from the subscriber device CE A 300 and transported without error to the service provider section, and the IE value is "1". ", It means that the packet reception error was detected from the subscriber device CE A (300), but received without error in the service provider (Service Provider) section.

If the values of the two BIP-8s are not the same, an error occurs during transport of the TCM packet. Therefore, it can be estimated that the performance degradation occurred in the network provider section. In this way, it is possible to monitor the performance of the Service Provider section.

5 is a diagram illustrating a configuration for TCM operation of a network provider level according to the present invention.

In the network provider section shown in FIG. 5, the TCM function is performed in the network provider TCM BIP- of 3 octets allocated for the TCM in the TCM packet, as in a service provider level TCM operation method. 1 octet of 8 (303) and 1 bit are used for the IE (Incoming Error, 305) setting.

The network provider NP A 320 checks an error on the received TCM packet with respect to the packet received from the subscriber device CE A 300 using the BIP-16 as in the service provider level TCM operation of FIG. 4. . If an error is detected in the received packet, the IE bit 305 for the network provider is set to "1" and stored. If the error is not detected, the IE bit 305 is set. After setting (305) to "0" and saving, calculate the BIP-8 in the same way as in the Service Provider level TCM in the following manner and the Network Provider TCM BIP- in the TCM packet. Store at 8 (303)

LSP TTSI

padding

BIP-16BIP-8 = Function type (08Hex)

LSP TTSI

padding

BIP-16

In addition, the network provider device PE 512 that receives the TCM packet transmitted through the network network calculates the BIP-8 for the received TCM packet and then BIP-8 308 of the TCM packet delivered from the PE 511. Compare with the BIP-8 value of.

If the two values are the same, it is determined that there is no performance degradation and no obstacle for the NP A 320 section, and the packet is transmitted to the other adjacent provider network NP B 321 connected thereto. However, if an error is detected or the IE bit is stored as "1", the error is reported in NP A 320 or the original subscriber device is reported to the network management device operated by the network provider. Know that an error signal is received from

Meanwhile, another network provider NP B 321 checks parity again for the TCM packet received from NP A 320 to measure performance of NP TCM B 541. That is, BIP-8 is calculated for the incoming TCM packet and compared with BIP-8 loaded in the TCM packet to check if there is an IE (Incoming Error), and if there is an error, the IE bit for the network provider or the network provider. (bit) is set to "1", the BIP-8 value is recalculated and stored and then transmitted to the PE 522. However, if there is no error, the IE bit is stored as "0" and the BIP-8 calculations retain their original values.

The receiving end PE 522 of the NP B 321 calculates a BIP-8 for the TCM packet received from the PE 521 and compares the calculated value with the BIP-8 value stored in the packet. If the values match by comparison, it is interpreted that no failure occurs in the NP TCM B (541) section. In this case, when the IE bit is stored as "1", it may be determined that a failure occurs in the NP A 520 network or a failure occurs in the previous network.

However, if the BIP-8 values do not match, it may be determined that a failure occurs in the NP TCM B 541 section.

In this way, each network operator can perform TCM function independently so that BIP-8 error or Incoming Error can be judged in each section. Network operators can know whether a failure has occurred in their network or whether the input signal body is an error. It becomes possible.

FIG. 6 is a diagram illustrating an ingress signal processing flow for a method of operating a TCM at a service provider level according to the present invention. That is, referring to FIG. 5, the packet processing performed by the PE 511 is illustrated.

The TCM at the service provider level first receives a TCM packet from a user equipment (S610).

When a packet is received, the BIP-16 is calculated from the received packet. BIP-16 is performed in the following way (S620).

padding(307)BIP-16 = LSP TTSI (306)

padding (307)

When the BIP-16 is calculated from the received packet, the BIP-16 308 stored in the received packet is compared with the calculated BIP-16 value to determine whether the values are the same and examine whether an error has occurred. (S630)

If it is determined that the two values are the same and no error occurs, "0" is stored in the IE bit 304 allocated for the service provider (S641).

If the two values are different from each other as a result of the determination, an error occurs, and "1" is stored in the IE bit 304 (S640).

If the error is determined using the BIP-16 value, and the " 0 " or " 1 " is stored in the IE bit 304, the BIP-8 is calculated. BIP-8 stores the value in a packet to see if an error occurs in the service provider TCM 202.

The BIP-8 is calculated by the following method, and the calculated value is stored in the service provider TCM BIP-8 302 of the packet (S650).

LSP TTSI(306)

padding(307)

BIP-16(308)BIP-8 = Function type (08Hex) (301)

LSP TTSI (306)

padding (307)

BIP-16 (308)

When the value of the service provider TCM BIP-8 302 of the packet is stored as described above, the packet is transmitted (S660).

7 is a diagram illustrating an egress signal processing flow for a TCM operating method of a service provider level according to the present invention. Referring to FIG. 5, the packet processing performed by the PE 532 is illustrated. However, here, operation of the TCM at the service provider level will be described, and operation of the TCM at the network provider level will be described with reference to FIG. 9.

The PE 532 receives a TCM packet transmitted through a network provider network (S710).

When the TCM packet is received, the IE bit 304 allocated for the service provider is searched for (S720).

If the value stored in the IE bit 304 is "1", it may be determined that an error has occurred in the user device or another service provider section before the current service provider (S740). )

If the value stored in the IE bit 304 is "0", it is determined that there was no error before the current service provider.

LSP TTSI(306)

padding(307)

BIP-16(308)에 의해 이루어지고, 이렇게 구해진 값을 이용해 수신된 패킷의 서비스 제공자(Service Provider) TCM BIP-8(302)에 저장된 값과 비교한다.(S750) Thus, after the determination of the service provider IE bit is made, the BIP-8 for the received TCM packet is calculated. The calculation of BIP-8 is BIP-8 = Function type (08Hex) (301).

LSP TTSI (306)

padding (307)

The value obtained by the BIP-16 308 and thus obtained is compared with the value stored in the service provider TCM BIP-8 302 of the received packet (S750).

If the value of the calculated BIP-8 and the values of the two BIP-8s of the service provider TCM BIP-8 302 stored in the TCM packet are the same, the determination may be divided into two cases.

First, when the value of the IE value 304 is "0", it is a case in which an error-free packet is received from the subscriber device CE A 300 and transported without error to the service provider section, and the IE value is "1". ", It means that the packet reception error was detected from the subscriber device CE A (300), but received without error in the service provider (Service Provider) section.

 If no error occurs in the service provider section, the IE 304 of the service provider is set to "0" (S770).

If the values of the two BIP-8s are not the same, it corresponds to an error occurring during the transport of the TCM packet. Therefore, it can be estimated that the performance degradation occurred in the network provider section. If an error occurs in the service provider section, the IE 304 of the service provider is set to "1".

The TCM packet is then transmitted to the CE B 310 (S790).

In this way, it is possible to monitor the performance of the Service Provider section.

8 is a diagram illustrating an ingress signal processing flow for a TCM operating method of a network provider level according to the present invention. Referring to FIG. 5, a process of processing a TCP packet in a PE 511, a PE 521, and a PE 531 is illustrated.

The TCM at the network provider level first receives a TCM packet from a user equipment or another network provider (S810).

When a packet is received, the BIP-8 is calculated from the received packet. BIP-8 is achieved in the following way (S820).

LSP TTSI(306)

padding(307)

BIP-16(308)BIP-8 = Function type (08Hex) (301)

LSP TTSI (306)

padding (307)

BIP-16 (308)

When the BIP-8 is calculated from the received packet, an error occurs by comparing the calculated BIP-8 value with the network provider BIP-8 303 stored in the received packet and determining whether the values are the same. Review whether or not it is done (S830).

If the two values are the same as the result of the determination, when no error occurs, "0" is stored in the IE bit 305 allocated for the network provider (S850).

If the two values are different from each other as a result of the determination, an error occurs, and "1" is stored in the IE bit 303 (S840).

If "0" is stored in the IE bit 305 because no error occurs, the value of the Network Provider BIP-8 303 is still maintained, and if an error occurs, the IE bit If "1" is stored in the 303, the newly calculated BIP-8 value is inserted into the network provider BIP-8 303. (S860)

When the network provider BIP-8 303 is determined, it transmits a TCP packet to the network (S870).

9 is a diagram illustrating an egress signal processing flow for a TCM operating method of a network provider level according to the present invention. Referring to FIG. 5, a process of processing a TCP packet in the PE 512, the PE 522, and the PE 532 is illustrated. However, although FIG. 9 looks almost similar to the process of FIG. 7, FIG. 7 relates to a service provider level, and FIG. 9 relates to a network provider level.

The PE 512, the PE 522, and the PE 532 receive the TCM packet transmitted through the network provider network (S910).

When the TCM packet is received, the IE bit 305 allocated for the network provider is searched for (S920).

If the value stored in the IE bit 305 is "1", it may be determined that an error has occurred in the network provider section before the current network provider (S940).

If the value stored in the IE bit 305 is "0", it is determined that there was no error before the current service provider. However, the PE 512 does not determine a network provider section since it does not exist before.

LSP TTSI(306)

padding(307)

BIP-16(308)에 의해 이루어지고, 이렇게 구해진 값을 이용해 수신된 패킷의 네트워크 제공자(Network Provider) TCM BIP-8(303)에 저장된 값과 비교한다.(S950) Thus, after the determination of the network provider IE bit 305 is made, the BIP-8 for the received TCM packet is calculated. The calculation of BIP-8 is BIP-8 = Function type (08Hex) (301).

LSP TTSI (306)

padding (307)

The value obtained by the BIP-16 308 and thus obtained is compared with the value stored in the network provider TCM BIP-8 303 of the received packet (S950).

If the values of the calculated BIP-8 and the values of the two BIP-8s of the network provider TCM BIP-8 303 stored in the TCM packet are the same, the determination may be divided into two cases.

First, if the value of the IE value 305 is "0", an error-free packet is transmitted from the previous network provider interval. If the IE value 305 is "1", an error from the previous network provider interval is received. Packet has been delivered, but it has been received without error in the current network provider section.

 If no error occurs in the current network provider section, the IE 305 of the network provider is set to "0" (S970).

If the values of the two BIP-8s are not the same, an error occurs during the transmission of the TCM packet. Therefore, it can be estimated that the performance degradation has occurred in the current network provider section. If an error occurs in the network provider section, the IE 305 of the network provider is set to "1" (S980).

The TCM packet is then transmitted to the next network provider section or the CE B 310 (S990).

In this way, you can monitor the performance of the Network Provider section.

FIG. 10 is a diagram illustrating an embodiment of a TCM packet processing method in a network provider section when a failure occurs.

FIG. 10 illustrates a case where a failure occurs in a network provider B 1100 as an example of how the TCM operates when a failure occurs in any one of the network providers. NP A 1000 assumes that there is no error in the TCM packet input from CE A.

Since there is no failure in NP A 1000, it is assumed that the calculated BIP-8 value is " 10101010 " like the network provider BIP-8 1001. In addition, since there is no Incoming Error, the Network Provider IE bit is stored as “0” and input to the NP B 1100. Since the NP B has failed, the original TCM packet may not be received, or a packet Errored TCM packet 1101 different from the original packet may be received. At this time, the NP B may know that an error has occurred in its own network, and the error occurrence packet is then transmitted to the NP C 1200 which is a network provider. In NP C, since the input signal itself has an error, the IE bit 1201 is stored as "1" and the new BIP-8 1202 calculated value "11110000" is used in the NP C network. On the other hand, since the IE bit is set to "1" in the receiving side PE (1350) of the NP C network, it can be seen that a failure has occurred in the previous network, and the result of calculating the BIP-8 value is displayed in the TCM packet. Since it is the same as, it can be seen that no error occurred in the magnetic network.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and it is common in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be apparent to those skilled in the art.

1 is a diagram showing the structure of an MPLS TCM packet using the "Reserved" byte of the ITU-T, Y.1711 MPLS OAM packet according to the present invention.

2 is a diagram illustrating a TCM monitoring interval for a user level, a service provider level, and a network provider level for an MPLS LSP according to the present invention.

3 is a diagram illustrating a configuration for operating a TCM at a user level according to the present invention.

4 is a diagram illustrating a configuration for operating a TCM at a service provider level according to the present invention.

5 is a diagram illustrating a configuration for TCM operation of a network provider level according to the present invention.

FIG. 6 is a diagram illustrating an ingress signal processing flow for a method of operating a TCM at a service provider level according to the present invention.

7 is a diagram illustrating an egress signal processing flow for a method of operating a TCM at a service provider level according to the present invention.

8 is a diagram illustrating an ingress signal processing flow for a TCM operating method of a network provider level according to the present invention.

9 is a diagram illustrating an egress signal processing flow for a TCM operating method of a network provider level according to the present invention.

FIG. 10 is a diagram illustrating an embodiment of a TCM packet processing method in a network provider section when a failure occurs.

Description of the main parts of the drawing

121: Service provider TCM BIP-8 field

122: Network Provider TCM BIP-8 field

123: Service Provider Incomming Error (IE) field

124: Network Provider Incomming Error field

Claims (16)

In the TCM method of the MPLS network using the MPLS OAM packet, Calculating a BIP-16 parity of the received TCM packet; Comparing the calculated BIP-16 parity with the BIP-16 parakey stored in the received TCM packet to determine whether an error is detected; Setting 0 or 1 to an eye area allocated to a service provider level according to the determination result; Calculating a BIP-8 parity of the received packet and storing the received packet in a Service Provider TCM BIP-8 field of the received packet; When the storage is complete, the TCM method in the MPLS network, characterized in that comprises the five steps of transmitting the packet at the Service Provider (Service Provider) level. The method of claim 1, wherein the received TCM packet is A Function Type field defining a TCM function, 1 byte is allocated to the TSM for the BIP-8 parity of the service provider level and the BIP-8 parity check of the network provider level, and the BIP-8. In the MPLS network, the TCM field includes 1 byte allocated to indicate whether the service provider level and the network provider level are IE (Incoming Error) by parity check. TCM method. The method of claim 1, wherein the calculation of the BIP-16 parity of the first step is performed. BIP-16 = LSP TTSI

TCM method in the MPLS network, characterized in that by padding. The method of claim 1, wherein the determination of the error in the second step Comparing the calculated BIP-16 parity with the BIP-16 parakey stored in the received TCM packet, it is determined that an error occurs when the values are different. TCM method in the MPLS network, characterized in that. The method of claim 1, wherein the three steps If it is determined that an error has occurred, TCM method in the MPLS network, characterized in that to store a 1 in the IE (Incoming Error) field allocated for the service provider (Service Provider). The method of claim 1, wherein the three steps If it is determined that no error has occurred, the TCM method in the MPLS network, characterized in that 0 is stored in the IE (Incoming Error) field allocated for the service provider (Service Provider). The method of claim 1, The BIP-8 parity of the received packet of step 4 is BIP-8 = Function type (08Hex).

LSP TTSI

padding

TCM method in the MPLS network, characterized in that made by BIP-16. In the TCM method of the MPLS network using the MPLS OAM packet, Step 1 of determining whether there is an error by searching an IE field allocated for a service provider of the received TCM packet; Calculating a BIP-8 of the received TCM packet and comparing the value with a value stored in a service provider TCM BIP-8 of the received packet to determine whether there is an error; And setting a predetermined value in an IE field of the service provider according to the determination result. The method of claim 8, wherein the first step The TCM method of the MPLS network, characterized in that it is determined that an error occurred before the current service provider when 1 is stored in the IE bit allocated for the service provider. The method of claim 8, wherein the first step TCM method in the MPLS network that determines that no error occurred before the current service provider when 0 is stored in the IE bit allocated for the service provider. The method of claim 8, wherein the calculation of the BIP-8 in the second step is BIP-8 = Function type (08Hex)

LSP TTSI

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TCM method in the MPLS network, characterized in that made by BIP-16. 12. The method of claim 11, wherein the determination of the error in the second step The value of the BIP-8 calculated by the received TCM packet is different from the value stored in the Service Provider TCM BIP-8 field of the received packet. TCM method in the MPLS network characterized in that it is determined that an error has occurred in the current service provider network. The method of claim 12, wherein the three steps If it is determined that an error has occurred in the current service provider network, the TCM method of the MPLS network, characterized in that 1 is stored in the IE field. In the TCM method of the MPLS network using the MPLS OAM packet, Calculating a BIP-8 from the received TCM packet; Determining whether an error occurs in a network provider network by comparing the calculated BIP-8 value with a network provider TCM BIP-8 value of the received packet; Storing a predetermined value in an IE 305 allocated for a network provider of the received packet according to the determination result; Changing the calculated value of a network provider TCM BIP-8 value of the TCM packet when an error occurs in the current network provider network as a result of the determination; And transmitting the TCM packet to a network provider network. The method of claim 14, wherein said three steps In the MPLS network, if an error occurs as a result of the determination, 1 is stored in an IE field allocated for a network provider of the received packet, and 0 is stored if an error does not occur. TCM method. In the TCM method of the MPLS network using the MPLS OAM packet, Step 1 of determining whether there is an error by searching an IE field allocated for a network provider of the received TCM packet; Calculating a BIP-8 of the received TCM packet, and comparing the received packet with a value stored in a network provider TCM BIP-8 to determine whether there is an error; TCM method in the MPLS network, characterized in that.

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