WO2006133635A1 - Procede de mesure des parametres de performance du reseau a commutation multiprotocole par etiquette - Google Patents

Procede de mesure des parametres de performance du reseau a commutation multiprotocole par etiquette Download PDF

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Publication number
WO2006133635A1
WO2006133635A1 PCT/CN2006/001288 CN2006001288W WO2006133635A1 WO 2006133635 A1 WO2006133635 A1 WO 2006133635A1 CN 2006001288 W CN2006001288 W CN 2006001288W WO 2006133635 A1 WO2006133635 A1 WO 2006133635A1
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Prior art keywords
parameter
measurement
message
frame
performance parameter
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PCT/CN2006/001288
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English (en)
French (fr)
Inventor
Suping Zhai
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Huawei Technologies Co., Ltd.
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=37519895&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2006133635(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to CN2006800119438A priority Critical patent/CN101160816B/zh
Priority to EP06742157.8A priority patent/EP1855416B2/en
Priority to DE602006015169T priority patent/DE602006015169D1/de
Priority to AT06742157T priority patent/ATE472870T1/de
Publication of WO2006133635A1 publication Critical patent/WO2006133635A1/zh
Priority to US11/751,920 priority patent/US20070242620A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00Arrangements for monitoring or testing data switching networks
    • H04L43/08Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00Arrangements for monitoring or testing data switching networks
    • H04L43/08Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0823Errors, e.g. transmission errors
    • H04L43/0829Packet loss
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00Arrangements for monitoring or testing data switching networks
    • H04L43/08Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0852Delays
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00Arrangements for monitoring or testing data switching networks
    • H04L43/08Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0876Network utilisation, e.g. volume of load or congestion level
    • H04L43/0888Throughput

Definitions

  • the present invention relates to techniques for measuring performance parameters of a wired communication network, and more particularly to a method for measuring performance parameters of a Multi-Protocol Label Switching (MPLS) network.
  • MPLS Multi-Protocol Label Switching
  • the measured performance parameters are an important means to accurately understand the MPLS network service shield.
  • the performance of the MPLS network can be accurately obtained through the measurement of the performance parameters. Therefore, the Internet Engineering Task Force (IETF) proposed the requirements for measuring the performance parameters of MPLS networks in the draft "draft-ietf-mpls-oam-requirements-05.txt". The following two points are mainly considered for the measurement of MPLS network performance parameters.
  • IETF Internet Engineering Task Force
  • MPLS network performance parameters such as frame loss parameters, frame delay parameters, and frame delay jitter parameters, which can better layout the MPLS network, improve the ability of the MPLS network to provide services, and play the MPLS network to a greater extent. Performance.
  • the ITU-T Y.1711 standard of the International Telecommunication Union (ITU) defines the connectivity check, LSP cross error check and LSP aggregation error check of the label switched path (LSP) in the MPLS network, and the available state of the LSP is performed.
  • Detailed regulations At present, there is no measurement implementation scheme that satisfies the above two requirements, that is, there is currently no method for measuring MPLS network performance parameters such as frame loss parameters, frame delay parameters, and frame delay jitter parameters.
  • the main object of the present invention is to provide a method for measuring MPLS network performance parameters, which is capable of measuring MPLS network performance parameters.
  • a method of measuring multi-protocol label switching MPLS network performance parameters comprising:
  • the sender sends the performance parameter measurement message to the receiver, where the performance parameter measurement message carries information used to measure the performance parameter of the MPLS network;
  • the receiver performs measurement of the corresponding MPLS network performance parameter according to the received information carried by the performance parameter measurement message.
  • step B the method further includes:
  • the receiver sends a response packet of the performance parameter measurement packet to the sender, where the response packet carries information used to measure the performance parameter of the MPLS network.
  • the sender performs measurement of the performance parameters of the corresponding MPLS network according to the received information carried by the response message.
  • the information for measuring the performance parameter of the MPLS network in step C includes a sequence number for measuring a frame loss parameter, and the sequence number is sequentially added according to the sequence of the sent response messages, and the first parameter sent to the receiver is sent.
  • the serial number of the measurement message is set to 1;
  • the measurement of the MPLS network performance parameter is performed as the measurement of the frame loss parameter in the step D.
  • the information used in step C for measuring MPLS network performance parameters includes measuring frame loss.
  • the measurement of the MPLS network performance parameter is performed as the measurement of the frame loss parameter in the step D.
  • the process is: after receiving the response message, the sender calculates the information carried in the response message according to
  • the information for measuring the performance parameters of the MPLS network described in step A includes a sent message counter value for measuring a frame loss parameter
  • the value of the transmitted message counter in step C is the same as the value of the transmitted message counter in the performance parameter test message received in step B.
  • the performance parameter measurement message is a frame loss measurement request FL-Request message; and the response message is a frame loss measurement response FL-Reply message.
  • the frame loss parameter measurement enable identifier is set on the sender and the receiver. Before step A, the method further includes:
  • the sender determines whether the frame loss parameter measurement enable flag is set, and if yes, performs step A; otherwise, the method is not executed;
  • the method further comprises: the receiving party determining whether the frame loss parameter measurement enable flag is set, and if yes, performing step C; otherwise, the method is not performed.
  • the information for measuring the performance parameter of the MPLS network in step C includes a sending timestamp for measuring a frame delay parameter, and the sending timestamp is the same as the sending timestamp for measuring the frame delay parameter in step A;
  • the measurement of the performance parameter of the PLS network is performed as the measurement of the frame delay parameter in the step D.
  • the process is: after the sender receives the response packet, the difference between the time of receiving the packet and the sending timestamp carried by the packet is Frame delay parameters obtained by two-way measurement.
  • the measurement of the frame delay parameter is performed on the packet validity check and the frame loss parameter.
  • the detection is performed after determining that no frames have been lost.
  • the information for measuring the performance parameters of the MPLS network described in step C further includes a sender sending timestamp, a receiving receiving timestamp, and a receiving timestamp for measuring the frame delay parameter.
  • the measurement of the performance parameter of the MPLS network is performed as the measurement of the frame delay parameter.
  • the process is as follows: After receiving the response packet, the sender sends the timestamp of the packet and the sender carrying the timestamp. The difference between the difference between the receiver receiving time stamp and the receiver sending time stamp carried by the message is used as a frame delay parameter obtained by bidirectional measurement.
  • the performance parameter measurement message is a frame delay measurement request FD-Request message
  • the response message is a frame delay measurement response FD-Reply message.
  • the frame delay parameter measurement enable identifier is set on the sender and the receiver. Before step A, the method further includes:
  • the sender determines whether the frame delay parameter measurement enable flag is set, and if so, performs step A; otherwise, the method is not executed;
  • the method further comprises: the receiver determining whether the frame delay parameter measurement enable flag is set, and if yes, performing step C; otherwise, the method is not performed.
  • the method further includes: measuring the performance parameter of the MPLS network as measured in step D as the measurement of the frame delay jitter parameter, and the frame delay jitter parameter is the difference of the frame delay parameters of the two response packets sent in sequence.
  • the number of performance parameter measurement messages in step A is more than one.
  • the information used in each performance parameter packet for measuring MPLS network performance parameters includes fixed length data for measuring frame throughput parameters, and the one is sent in sequence. When the above performance parameter message is used, the transmission rate is gradually increased;
  • the information for measuring MPLS network performance parameters described in step C includes fixed length data for measuring frame throughput parameters;
  • the measurement of the MPLS network performance parameter is performed to measure the frame throughput parameter, and the process is: the sender determines whether a frame loss occurs, and if yes, the sending rate of the performance parameter measurement packet corresponding to the response packet is used as a measurement.
  • the resulting frame throughput parameter otherwise, continue to receive response messages.
  • the performance parameter measurement message is a frame throughput request LB-Req message
  • the response message is a frame throughput response LB-Res message.
  • the information for measuring the performance parameter of the MPLS network in step A is a sequence number for measuring a frame loss parameter, and the sequence number is sequentially added according to the sequence of the sent performance parameter measurement messages, and the first one is sent to the receiver.
  • the serial number of the parameter measurement message is set to 1;
  • the measurement of the MPLS network performance parameter is performed as the measurement of the frame loss parameter in step B.
  • the process is: when the performance parameter measurement message is not received, the receiver sets the sequence number of the currently received performance parameter measurement message to 0.
  • the receiver sets the sequence number of the currently received performance parameter measurement message to 0.
  • the next serial number (currently received the serial number carried by the performance parameter measurement message + 1) mod 2 16 , where mod represents If the number is the same, the measured frame loss parameter is 0. If not, the measured frame loss parameter is based on the sequence number carried by the currently received performance parameter measurement message and the next serial number expected to be received. The difference between the determinations.
  • the information used to measure the performance parameter of the MPLS network in step A is a transmission timestamp for measuring a frame delay parameter
  • the measurement of the performance parameter of the MPLS network is performed as the measurement of the frame loss parameter.
  • the process is as follows: After the receiver receives the performance parameter measurement packet, the difference between the time when the receiver receives the packet and the transmission timestamp carried by the packet In addition, the clock difference between the receiver and the sender is used as the measured one-way frame loss parameter.
  • the method also includes:
  • the measurement of the performance parameter of the MPLS network is performed in step B to measure the frame delay jitter parameter.
  • the frame delay jitter parameter is the difference between the frame delay parameters of the two performance parameter measurement messages sent in sequence.
  • the measurement of the frame delay parameter is performed after the message validity check and the frame loss parameter detection are performed to determine that the frame is not lost.
  • the performance parameter measurement message is a loopback request message, and the response is a loopback response.
  • the interval of transmitting the performance measurement message described in step A is preset.
  • the present invention constructs a performance parameter measurement message for measuring the performance parameter of the MPLS network, and the performance parameter measurement message carries information for measuring the performance parameter of the MPLS network, and the performance parameter measurement message is used in the MPLS network.
  • the LSP is transmitted in the LSP, so that the LSP-party performs the measurement of the MPLS network performance parameter according to the information in the performance parameter packet sent by the LSP, and the measured MPLS network performance parameter may include the frame loss parameter and the frame delay. Time parameter, frame delay jitter parameter or / and frame throughput parameter. Therefore, the method provided by the present invention is capable of measuring MPLS network performance parameters.
  • FIG. 1 is a flow chart of a method for measuring performance parameters of an MPLS network according to the present invention. Mode for carrying out the invention
  • the present invention sets a performance parameter measurement message, and the performance parameter measurement message can be a loopback request message or a loopback reply message.
  • the structure of the loopback request packet is shown in Table 1.
  • the structure of the loopback reply packet is shown in Table 2.
  • the sender constructs the loopback request packet shown in Table 1 and sends it to the receiver.
  • the timestamp (TimeStamp Received) may not be included, and the timestamp (TimeStamp Sent) may be sent.
  • the function type (Funcition type) can be set to the type of the request message
  • the path terminal source identifier (LSP TTSI) is set to the sender's identity.
  • the checksum (BIP16) can be set to the check value calculated by the preset algorithm. Padding can set the MPLS LSP label so that the loopback request message can reach the receiver. .
  • the receiver can obtain the unidirectional measured MPLS network performance parameter according to the carried information, and the receiver sends the measurement.
  • the loopback reply packet shown in Table 2 can be configured to be sent to the sender.
  • the sender can obtain the MPLS network performance parameters measured bidirectionally according to the information carried in the loopback reply packet.
  • the TimeStamp Sent may not be included, and the TimeStamp Received may be set to the time-of-day of the receiver's clock.
  • the Funcition type can be set to respond to the type of the message, such as 0x06, LSP TTSI is set to the identifier of the receiver, BIP16 can be set to the check value calculated by the same algorithm as the sender, and Padding can set the MPLS LSP label. So that the loopback reply message can reach the sender.
  • the packet described in Table 1 or Table 2 is a packet with a Layer 2 frame encapsulation format.
  • the Layer 2 frame feature is constructed according to the MPLS LSP between the sender and the receiver.
  • the loopback request is reported.
  • the text includes source media access control (MAC) address, virtual path (VPI) / virtual channel (VCI) and data link identification code (DLCI), and loopback reply includes the destination MAC address, VCI and DLCI.
  • MAC source media access control
  • VPN virtual path
  • VCI virtual channel
  • DLCI data link identification code
  • the MPLS LSP fails to recover after entering the defect state for 10 seconds (S)
  • the MPLS LSP enters the unavailable state
  • the MPLS LSP recovers within the defect state 10S
  • the MPLS LSP does not enter the available state, but it is possible that a frame loss occurs when transmitting a message. Therefore, in order to more accurately test the frame delay parameter, the frame jitter parameter, and the frame throughput parameter, the sequence number is set in the performance measurement message described in Table 1 and Table 2, so that the sender can follow the sequence set in the loopback reply message.
  • the number measurement obtains the frame loss parameter of the receiver; the receiver measures the frame loss parameter of the sender according to the loopback request message. In this way, when the frame loss parameter of the MPLS LSP is detected, the frame delay parameter, the frame delay jitter parameter, and the frame throughput parameter are not measured, so as to obtain inaccurate MPLS network performance parameters.
  • sequence number setting and processing process includes:
  • the sender such as the ingress LSR, sets the sequence number in the loopback request message sent to the receiver, such as the egress LSR, and the sequence number is sent along with the loopback request.
  • the sequence of the text is incremented by one, and the sequence number of the first loopback request message sent to the receiver is set to 1.
  • the receiving party when receiving the initial loopback request message, that is, before receiving the first loopback request message sent by the sender, can set the expected sequence number to be 0, and subsequently receive the loopback request message in sequence. Check whether the serial number carried in the text meets the following rules:
  • next serial number (currently received the sequence number carried by the loopback request message + 1) mod 2 16 , where mod represents the remainder and 2 16 is the maximum value of the sequence number, ie the sequence number of the loopback request message Circulate sequentially between 1 and 2 16 according to the order of transmission.
  • the loopback request 4 received by the receiver in turn meets the above rules, it means that no frame is lost when the message is transmitted, and the frame loss parameter is 0; otherwise, the MPLS network loses the frame, and the frame loss parameter is determined according to the number of losses. .
  • the sender can also determine the frame loss parameter of the message sent by the receiver.
  • the receiver will send the sequence number to 1 in the order of the message sent to the sender's loopback reply message.
  • the added sequence number is set in the loopback reponse message; after receiving the loopback reponse message, the sender determines the frame loss parameter of the message sent by the receiver according to the rule described in step 2).
  • the sender may also set the sequence number in all the loopback request messages sent to 0 or all the loopback reply messages to be sent by the receiver.
  • the serial number is set to 0 to notify the other party Detection of serial numbers is not supported.
  • FIG. 1 is a flow chart of a method for measuring performance parameters of an MPLS network according to the present invention, and the specific steps are as follows:
  • Step 100 The sender constructs a loopback request
  • the loopback request can be constructed in multiples or only one.
  • the message structure shown in Table 1 can be employed.
  • a serial number such as a measure for measuring whether the message is lost.
  • Step 101 The sender sends the constructed loopback request to the receiver.
  • multiple loopback requests can be sent to the receiver.
  • Step 102 The receiver obtains the unidirectional MPLS network performance parameter according to the received loopback request measurement.
  • the receiver receives multiple loopback requests in turn, and measures the MPLS network performance parameters of the sender according to multiple loopback requests.
  • the measured MPLS network performance parameters are more accurate.
  • Step 103 The receiver constructs a loopback reply according to the received loopback request.
  • the loopback reply loopback request is configured accordingly; when the loopback request is multiple, the loopback reply loopback request constructs one.
  • the message structure shown in Table 2 can be employed.
  • a serial number such as a measure for measuring whether the message is lost.
  • Step 104 The receiver sends the constructed loopback reply to the sender.
  • Step 105 The sender obtains the bidirectional MPLS network performance parameter according to the received loopback reply measurement.
  • the sender receives multiple loopback replyes in turn, and obtains bidirectional MPLS network performance parameters according to multiple loopback reply measurements, so that the measured MPLS network performance parameters are more accurate.
  • the unidirectional measurement of the MPLS network performance parameters can also be performed. At this time, steps 103 to 105 can be omitted.
  • the frame delay parameter and the frame delay jitter parameter Before measuring the frame delay parameter and the frame delay jitter parameter, it can be determined that the message is not lost and then measured, so that the measured frame delay parameter and the frame delay jitter parameter are more accurate. Of course, it is also possible to directly measure the frame delay parameter and the frame delay jitter parameter without first determining whether the message is lost.
  • the loopback request packet that is sent by the sender according to the packet 1 carries the TimeStamp Sent BIP16 and the Sequence Number.
  • the receiver can calculate the unidirectional frame delay parameters of each loopback request in turn, and then take an average to obtain the final unidirectional frame delay parameter.
  • the loopback request message sent by the sender according to Table 1 is carried in the message PT/CN2006/001288
  • the receiver calculates the frame delay parameter according to the unidirectional frame delay parameter process, and constructs a loopback reply according to the information carried in the loopback request message according to Table 2.
  • the packet is sent to the receiver, and the packet carries the TimeStamp Received, the BIP16, and the Sequence Number.
  • the sender After receiving the loopback reply packet, the sender performs the validity check according to the BIP16 carried in the packet, and performs the validity check according to the sequence number carried in the packet. Check if the message is missing. If the packet passes the check, the unidirectional frame delay parameter is obtained according to the TimeStamp Received carried in the packet and the time when the packet is received by the packet.
  • the sender can calculate the unidirectional frame delay parameters of each loopback reply in turn, and then take an average to obtain the final unidirectional frame delay parameter.
  • the processing time value of the receiver's validity check may be removed in the process of calculating the frame delay parameter. Improve the accuracy of frame delay measurement.
  • the invention uses the frame delay parameter obtained by one-way measurement or the frame delay parameter obtained by two-way measurement to calculate the corresponding frame delay jitter parameter.
  • the frame delay jitter parameter FD2-FD1, that is, the difference of the frame delay parameters of two adjacent loopback request messages.
  • the frame delay jitter parameter is FD2-FD1, which is the difference between the frame delay parameters of two adjacent loopback reply messages.
  • the PT/CN2006/001288 mean is the measurement of the final frame delay jitter parameter.
  • the measurement of the frame loss parameter refers to the difference between the number of loopback request 4s sent by the sender and the number of received loopback repl files within a period of time, such as 1 second.
  • Frame loss parameter
  • FT indicates the number of loopback request packets sent by the sender within the specified time period, such as within 1 second
  • FR indicates the loopback repl message received by the sender within a specified period of time, such as within 1 second. number.
  • the present invention may use a frame loss measurement (Frame Loss Measurement) message as a performance parameter measurement message, and transmit the message in an MPLS network, where the message specifically includes a frame loss measurement request (FL-Request). Packet and frame loss measurement response (FL-Reply) message, the structure is shown in Table 3:
  • the present invention distinguishes between a request message and a response message by different Function types, and the Function Type of the two messages needs to be determined according to the coding in Y.1711.
  • the sender that is, the Ingress LSR
  • the receiver that is, the Egress LSR
  • the sender are provided with frame counters for counting the transmitted and received messages, respectively.
  • the frame loss parameter measurement is enabled on the Ingress LSR and the Egress LSR respectively.
  • the ingress LSR periodically sends an FL-Request packet carrying the packet count value (IngressTxFrmCnt).
  • the received packet count value (EgressRxFrmCnt) is meaningless.
  • the egress LSR receives the FL-Request packet.
  • the FL-Reply packet is sent to the Ingress LSR, and the IngressTxFrmCnt in the FL-Request packet is copied and the EgressRxFrmCnt is carried in the FL-Reply packet.
  • the Ingress LSR calculates the frame loss. Parameters: FT2 - FT1) -
  • the frame loss parameter measurement enable flag needs to be configured in both the ingress and the egress LSR, and the frame loss parameter measurement is determined according to the identifier parameter.
  • the default value can be 100ms.
  • the other field values in the message structure shown in Table 3 can be constructed according to the message structure shown in Table 1 or the message structure shown in Table 2.
  • the present invention can use the frame delay measurement request (FD-equest) message and the frame delay measurement response (FD-Reply) message as the performance parameter measurement document, and the two structures are both As shown in Table 4:
  • the request message and the response message are distinguished by different Function types, and the Function Type of the two messages needs to be determined according to the coding in Y.1711.
  • the Ingress TimeStamp Sent in the packet shown in Table 4 refers to the time-of-day of the clock relative to the sender (relative to the time of day), and the Egress TimeStamp Sent refers to the time-of-day of the clock relative to the receiver. (relative to the time of day).
  • the frame delay parameter measurement is enabled in the Ingress LSR and Egress LSR respectively.
  • the Ingress LSR sends an FD-Request packet to the Ingress TimeStamp Sent.
  • the Egress LSR receives the FD-Request packet and constructs the FD-Reply packet.
  • the Egress LSR responds to the Ingress LSR and copies the Ingress TimeStamp Sent in the request.
  • the frame delay parameter measurement enable flag on the ingress LSR and the egress LSR you need to configure the frame delay parameter measurement enable flag on the ingress LSR and the egress LSR, and determine whether to perform the frame delay parameter measurement according to the identifier parameter. Also, configure the FD-Request report in the ingress LSR.
  • the sending interval of the text, the default value of this parameter can be set to 100ms.
  • the other field values in the message structure shown in Table 4 can be constructed according to the message structure shown in Table 1 or the structure shown in Table 2.
  • the unidirectional frame delay parameter measurement and the bidirectional frame delay measurement can be adopted. The two methods will be described separately below.
  • the ingress LSRJ ⁇ _ sends an FD-Request packet.
  • the packet carries the Ingress TimeStamp Sent.
  • the egress LSR checks the validity of the packet. The validity check includes the check for the sequence number. If the number is not the expected sequence number of the received message, the message is ignored. If the validity check is made to confirm that the message is valid, the record is received.
  • the unidirectional delay parameter is calculated by the LSP-Request time Egress TimeStamp Received and the transmission time Ingress TimeStamp Sent carried in the received FD-Request message.
  • the sender and receiver clocks in the MPLS network are required to be synchronized, or the Egress LSR knows the clock difference between the sender and the receiver.
  • the ingress LSR ⁇ - sends an FD-Request packet, and the ingress TimeStamp Sent is carried in the packet.
  • the egress LSR constructs the FD-Reply packet. 113 ⁇ 4 633 1 ⁇ 1 received?
  • the validity of the message is checked. The validity check includes the check for the serial number. When the serial number is not the expected sequence number of the received message, the message is ignored. If the validity is checked.
  • the information carried in the Ingress TimeStamp Sent field indicates that the Ingress LSR sends the information.
  • Timestamp of FD-Request Egress TimeStamp Received information representation of Received domain The timestamp of the FD-Reply sent by the Egress Timestamp.
  • the frame delay parameter can be calculated more accurately, and the time when the receiver processes the message is no longer included.
  • the frame delay jitter parameter FD2 - FD1.
  • the frame delay jitter parameter FD2 - FD1.
  • the throughput is related to the frame size of the transmitted message.
  • the throughput can be measured by using the frame throughput request (LB-Req) message and the frame throughput response (LB-Res) message, specifically in the padding field of the packet.
  • the data of different lengths is filled in, and the LB-Req transmission rate is gradually increased for each length of the packet, and whether the LB-Res is dropped is recorded.
  • the transmission rate of the LB-Req packet is recorded when there is a significant frame loss, that is, the measurement result of the throughput.
  • the present invention specifies the performance parameter measurement of the MPLS network, including the measurement of the frame delay parameter, the frame delay jitter parameter, the frame throughput parameter, and the frame loss parameter, and provides for planning the MPLS network.
  • An important reference is provided and provides a basis for checking the compliance of SLAs in existing MPLS networks.

Description

一种测量多协议标签交换网络性能参数的方法
技术领域
本发明涉及测量有线通信网络的性能参数技术, 特別涉及一种测量 多协议标签交换 ( MPLS ) 网络性能参数的方法。 发明背景
在 MPLS 网絡的实际应用中, 测量得到的性能参数是准确了解 MPLS网络服务盾量的一个重要手段, 通过性能参数的测量可以准确地 获取 MPLS网络当前的服务质量。 因此, 互联网工程任务组(IETF )在 草案 "draft-ietf-mpls-oam-requirements-05.txt" 中提出了对 MPLS网络性 能参数测量的需求, 针对 MPLS网络性能参数的测量主要考虑以下两点 需求:
1、 为了检验 MPLS 网络中服务等级协议 ( SLA ) 的符合度, 考核 MPLS网络提供服务的能力,需要对 MPLS中的 LSP传输特性进行测量;
2、 测量 MPLS 网络性能参数, 如: 帧丟失参数、 帧延时参数和帧 延时抖动参数, 可以更好地对 MPLS网络进行布局, 提高 MPLS网络提 供业务的能力, 更大程度地发挥 MPLS网络的性能。
国际电信联盟(ITU ) 的 ITU-T Y.1711标准中定义了在 MPLS网络 中的标签交换路径 ( LSP ) 的连通性检查、 LSP交叉错误检查和 LSP聚 合错误检查, 且对 LSP的可用状态进行了详细的规定。 但是, 目前却还 没有给出满足上述 2点需求的测量实现方案, 即目前还没有测量诸如帧 丟失参数、 帧延时参数和帧延时抖动性参数的 MPLS网络性能参数的方 法。 发明内容
有鉴于此, 本发明的主要目的在于提供一种测量 MPLS网络性能参 数的方法, 该方法能够测量 MPLS网络性能参数。
根据上述目的, 本发明的技术方案是这样实现的:
一种测量多协议标签交换 MPLS网络性能参数的方法,该方法包括:
A、 发送方将性能参数测量报文发送给接收方, 该性能参数测量报 文携带用于测量 MPLS网络性能参数的信息;
B、 接收方根据接收到的由性能参数测量报文携带的信息进行相应 MPLS网络性能参数的测量。
在步骤 B之后, 该方法还包括:
C、 接收方将性能参数测量报文的回应报文发送给发送方, 该回应 报文携带用于测量 MPLS网络性能参数的信息;
D、 发送方根据接收到的由回应报文携带的信息进行相应 MPLS 网 络性能参数的测量。
步驟 C所述用于测量 MPLS网络性能参数的信息包括用于测量帧丢 失参数的序列号,该序列号按照所发送的回应报文的先后顺序依次加 1 , 第一个向接收方发送的参数测量报文的序列号设置为 1;
步骤 D所述进行 MPLS网络性能参数的测量为帧丟失参数的测量, 过程为: 在未接收到回应报文时, 发送方设置当前接收到的回应报文的 序列号为 0, 在依次接收到回应报文时检查所携带的序列号是否符合: 所期望收到下一个序列号 = (当前接收到回应报文携带的序列号 + 1 ) mod 216,其中 mod表示余数,如果符合,则测量得到的帧丟失参数为 0, 如果不符合, 则测量得到的帧丟失参数根据当前接收到回应 4艮文携带的 序列号与所期望收到的下一个序列号之间的差值确定。
步骤 C所述用于测量 MPLS网络性能参数的信息包括用于测量帧丢 失参数的发送报文计数器值和接收报文计数器值;
步骤 D所述进行 MPLS网络性能参数的测量为帧丟失参数的测量, 过程为: 发送方接收到回应报文后, 根据回应报文携带的信息按照 |FT2 -FT1|- |FR2- FR1|计算得到帧丢失参数, 其中, FT表示发送方从回应报 文中得到的发送计数器值, FR表示发送方从回应报文中得到的接收计 数器值。
步骤 A所述的用于测量 MPLS网络性能参数的信息包括用于测量帧 丢失参数的发送报文计数器值;
步骤 C所述的发送^ =艮文计数器值与所述步骤 B接收到的性能参数测 试报文中的发送报文计数器值相同。
所述的性能参数测量报文为帧丢失测量请求 FL-Request报文; 所述 的回应报文为帧丟失测量回应 FL-Reply报文。
在发送方和接收方设置帧丟失参数测量使能标识, 在步骤 A之前, 该方法还包括:
发送方判断是否设置了帧丟失参数测量使能标识, 如果是, 执行步 骤 A; 否则, 不执行所述方法;
在步骤 C之前, 该方法还包括: 接收方判断是否设置了帧丢失参数 测量使能标识, 如果是, 执行步驟 C; 否则, 不执行所述方法。
步骤 C所述用于测量 MPLS网络性能参数的信息包括用于测量帧延 时参数的发送时间戳,该发送时间戳与步骤 A中的用于测量帧延时参数 的发送时间戳相同;
步骤 D所述进行 PLS网络性能参数的测量为帧延时参数的测量, 过程为: 发送方接收到回应报文后, 将接收该报文的时间与该报文携带 的发送时间戳之差作为双向测量得到的帧延时参数。
所述的帧延时参数的测量是在进行了报文合法性检测和帧丟失参数 检测确定未丟失帧后进行。
步骤 C所述的用于测量 MPLS网络性能参数的信息还包括用于测量 帧延时参数的发送方发送时间戳、 接收方接收时间戳和接收方发送时间 戳,
步骤 D所述进行 MPLS网络性能参数的测量为帧延时参数的测量, 过程为: 发送方接收到回应报文后, 将接收到该报文的时间与该报文携 带的发送方发送时间戳之差 , 再与该报文携带的接收方接收时间戳和接 收方发送时间戳之差之间的差值作为双向测量得到的帧延时参数。
所述的性能参数测量报文为帧延时测量请求 FD-Request报文,所述 的回应报文为帧延时测量回应 FD-Reply报文。
在发送方和接收方设置帧延时参数测量使能标识, 在步驟 A之前, 该方法还包括:
发送方判断是否设置了帧延时参数测量使能标识, 如果是, 执行步 骤 A; 否则, 不执行所述方法;
在步驟 C之前, 该方法还包括: 接收方判断是否设置了帧延时参数 测量使能标识, 如果是, 执行步骤 C; 否则, 不执行所述方法。
该方法还包括:步骤 D所述进行 MPLS网络性能参数的测量为帧延 时抖动参数的测量, 帧延时抖动参数为两个依次发送的回应报文的帧延 时参数的差值。
步骤 A所述性能参数测量报文的数目为一个以上,在每个性能参数 报文携带的用于测量 MPLS网络性能参数的信息包括用于测量帧吞吐量 参数的定长数据, 依次发送该一个以上的性能参数报文时, 逐步增加发 送速率;
步骤 C所述的用于测量 MPLS网络性能参数的信息包括用于测量帧 吞吐量参数的定长数据; 步骤 D所述进行 MPLS网络性能参数的测量为测量帧吞吐量参数, 过程为: 发送方判断是否出现丢幀, 如果是, 则将该回应报文对应的性 能参数测量报文的发送速率作为测量得到的帧吞吐量参数; 否则, 继续 接收回应报文。
所述的性能参数测量报文为帧吞吐量请求 LB-Req报文, 所述的回 应 4艮文为帧吞吐量响应 LB-Res报文。
步骤 A所述用于测量 MPLS网络性能参数的信息为用于测量帧丢失 参数的序列号, 该序列号按照所发送的性能参数测量报文的先后顺序依 次加 1 , 第一个向接收方发送的参数测量报文的序列号设置为 1;
步骤 B所述进行 MPLS网络性能参数的测量为帧丢失参数的测量, 过程为: 在未接收到性能参数测量报文时, 接收方设置当前接收到的性 能参数测量报文的序列号为 0, 在依次接收到参数测量报文时检查所携 带的序列号是否符合: 所期望收到下一个序列号 = (当前接收到性能 参数测量报文携带的序列号 + 1 ) mod 216, 其中 mod表示余数, 如果 符合, 则测量得到的帧丟失参数为 0, 如果不符合, 则测量得到的帧丢 失参数根据当前接收到性能参数测量报文所携带的序列号与所期望收 到的下一个序列号之间的差值确定。
步驟 A所述用于测量 MPLS网络性能参数的信息为用于测量帧延时 参数的发送时间戳;
步骤 B所述进行 MPLS网络性能参数的测量为帧丢失参数的测量, 过程为: 接收方接收到性能参数测量报文后, 将接收该报文的时间与该 报文携带的发送时间戳之差再加上接收方和发送方之间的时钟差作为 测量得到的单向帧丟失参数。
该方法还包括:
步骤 B所述进行 MPLS网络性能参数的测量为帧延时抖动参数的测 量, 该帧延时抖动参数为两个依次发送的性能参数测量报文的帧延时参 数的差值。
所述的帧延时参数的测量是在进行了报文合法性检测和帧丟失参数 检测确定未丢失帧后进行的。
所述的性能参数测量报文为环回请求 loopback request报文,所述的 回应才艮文为环回回应 loopback reply 艮文。
步骤 A所述的发送性能测量报文的间隔是预先设定的。
从上述方案可以看出, 本发明构造了测量 MPLS网络性能参数的性 能参数测量报文, 该性能参数测量报文携带用于测量 MPLS网络性能参 数的信息,将该性能参数测量报文在 MPLS网络中的 LSP中传输,从而 使 LSP—方根据接收到的 LSP对方发送的该性能参数报文中的信息,进 行 MPLS网络性能参数的测量,测量的 MPLS网络性能参数可以包括帧 丟失参数、 帧延时参数、 帧延时抖动参数或 /和帧吞吐量参数。 因此, 本 发明提供的方法能够测量 MPLS网络性能参数。 附图简要说明
图 1为本发明测量 MPLS网络性能参数的方法流程图。 实施本发明的方式
为使本发明的目的、技术方案和优点更加清楚明白,以下举实施例, 并参照附图, 对本发明进一步详细说明。
本发明为了测量 MPLS网络性能参数, 设置了性能参数测量报文, 该性能参数测量报文可以为环回请求(loopback request )报文或环回回 应 ( loopback reply )报文。 其中, loopback request报文的结构示意图如 表 1所示, loopback reply报文的结构示意图如表 2所示。
Figure imgf000009_0001
Figure imgf000009_0002
表 2
当测量 MPLS 网络性能参数时, 发送方构造表 1 所示的 loopback request报文发送给接收方, 其中, 在构造时, 可以不包括接收时间戳 ( TimeStamp Received ), 发送时间戳 ( TimeStamp Sent )可以为发送方 的时钟的一天时间(time-of-day ), 即以 1 ~ 24小时中的其中一个小时作 为 TimeStamp Sent, 功能类型 (Funcition type )可以设置为请求报文的 类型,路径终端源标识(LSP TTSI )设置为发送方的标识,校验(BIP16 ) 可以设置采用预先设定的算法计算得到的校验值, 填充(Padding ) 可以 设置 MPLS LSP标签, 使得 loopback request报文可以到达接收方。
当测量 MPLS网絡性能参数时, 接收方接收到发送方发送的表 1所 示的 loopback request报文后,就可以根据所携带的信息得到单向测量的 MPLS网络性能参数, 接收方在测量得到发送方的 MPLS网络性能参数 后, 还可以构造表 2所示的 loopback reply报文发送给发送方, 用于发 送方根据 loopback reply报文携带的信息得到双向测量的 MPLS网络性 能参数。 其中, 在构造 loopback reply报文时, 可以不包括 TimeStamp Sent, TimeStamp Received 可以设置为接收方的时钟的 time-of-day, Funcition type可以设置为回应报文的类型, 如 0x06, LSP TTSI设置为 接收方的标识, BIP16可以设置采用预先设定的与发送方相同的算法计 算得到的校验值, Padding可以设置 MPLS LSP标签,使得 loopback reply 报文可以到达发送方。
表 1或表 2所述的报文都是具有二层帧封装格式的报文, 根据发送 方和接收方之间的 MPLS LSP在建立或改变时进行二层帧特性构造, 其 中, loopback request报文包括源介质访问控制(MAC )地址、 虚拟通路 ( VPI ) /虛拟通道 ( VCI )和数据链路识別码(DLCI ), loopback reply 寺艮文包括目的 MAC地址、 VCI和 DLCI。
在所有测量 MPLS网络性能参数的过程中,都是基于 MPLS网络可 用状态下进行的。 但是, MPLS 网絡处于可用状态下时, 并不能说明 MPLS LSP在传输报文时不会出现帧丢失的情况。 当 MPLS网络发生帧 丟失时, 也就是根据所传输的表 1或表 2所示的性能测量报文中的序列 号确定发生帧丢失时, MPLS网络有很大可能还处于可用状态, 这是因 为按照 ITU-T Y.1711中 MPLS网络可用状态的定义,当 MPLS LSP进入 缺陷状态 10 秒(S )后没有恢复, MPLS LSP 才进入不可用状态; 当 MPLS LSP在进入缺陷状态 10S之内恢复, MPLS LSP不进入可用状态, 但这时有可能在传输报文时出现帧丢失。 因此, 为了更加精确测试帧延 时参数、 帧抖动参数和帧吞吐量参数, 在表 1和表 2所述的性能测量报 文中设置序列号, 以便发送方根据 loopback reply报文中设置的序列号 测量得到接收方的帧丢失参数;接收方根据 loopback request报文测量得 到发送方的帧丢失参数。 这样, 当检测到 MPLS LSP的帧丢失参数, 就 可以不进行帧延时参数、 帧延时抖动参数以及帧吞吐量参数的测量, 以 免获得不准确的 MPLS网络性能参数。
当然, 也可以在测量帧延时参数、 帧延时抖动参数以及帧吞吐量参 数时, 不进行帧丢失参数的测量。
在本发明中, 序列号的设置和处理过程包括:
1 )发送方, 如入口标签交换路由器(Ingress LSR )在依次向接收 方, 如出口标签交换路由器(Engress LSR )发送的 loopback request报 文中分别设置序列号,序列号随着所发送 loopback request报文的先后顺 序依次加 1 , 第一个向接收方发送的 loopback request报文的序列号设置 为 1。
2 )接收方, 在接收 loopback request报文的初始时, 也就是接收到 发送方发送的第一个 loopback request报文之前可以设置期望收到的序 列号为 0, 在后续依次接收到 loopback request报文时检查所携带的序列 号是否符合以下规则:
所期望收到下一个序列号 = (当前接收到 loopback request报文携 带的序列号 + 1 ) mod 216,其中 mod表示余数, 216为序列号的最大值, 即 loopback request报文的序列号在 1 ~ 216间根据发送顺序依次循环。
如果接收方依次接收到的 loopback request 4艮文都满足以上规则,则 说明在传输报文时没有丢失帧, 帧丟失参数为 0; 否则, 则说明 MPLS 网络丢失帧, 帧丢失参数按照丟失数目确定。
同样的道理, 发送方也可以确定接收方所发送 4艮文的帧丢失参数, 这时, 由接收方将按照发送给发送方 loopback reply报文的顺序, 从序 列号设置为 1开始依次将递加的序列号设置在 loopback reponse报文中; 发送方接收到 loopback reponse报文后,根据步骤 2 )所述的规则确定接 收方所发送报文的帧丟失参数。
在本发明中, 如果接收方和发送方不支持序列号的检测, 发送方也 可以将发送的所有 loopback request报文中的序列号设置为 0或接收方将 发送的所有 loopback reply报文中的序列号设置为 0,用以通知对方自身 不支持序列号的检测。
图 1为本发明测量 MPLS网络性能参数的方法流程图, 其具体步骤 为:
步骤 100、 发送方构造 loopback request
该 loopback request可以构造多个, 也可以只构造一个。
在构造时, 可以采用表 1中所示的报文结构构造, 当然, 也可以携 带诸如用于测量报文是否丢失的序列号。
步驟 101、 发送方将构造的 loopback request发送给接收方。
当构造多个 loopback request, 可以将所构造的多个 loopback request 发送给接收方。
步骤 102、接收方根据接收到的 loopback request测量得到单向 MPLS 网络性能参数。
当有多个 loopback request, 接收方依次接收多个 loopback request, 并根据多个 loopback request测量得到 送方的 MPLS网络性能参数,这 样测量得到的 MPLS网络性能参数更加准确。
步骤 103、 接收方根据接收到的 loopback request, 构造 loopback reply。
当 loopback request为多个时, 该 loopback replyloopback request相 应地构造多个; 当 loopback request为多个时, 该 loopback replyloopback request ^目应地构造一个。
在构造时, 可以采用表 2中所示的报文结构构造, 当然, 也可以携 带诸如用于测量报文是否丢失的序列号。
步骤 104、 接收方将构造的 loopback reply发送给发送方。
步骤 105、 发送方根据接收到的 loopback reply测量得到双向 MPLS 网络性能参数。 当有多个 loopback reply,发送方依次接收多个 loopback reply,并根 据多个 loopback reply测量得到双向 MPLS网络性能参数, 这样测量得 到的 MPLS网络性能参数更加准确。
在本发明中, 也可以进行单向测量 MPLS网络性能参数, 在这时, 可以省略步骤 103 ~步骤 105。
下面分别对单向 MPLS网络性能参数的测量和双向 MPLS网络性能 参数的测量进行详细说明。
在测量帧延时参数和帧延时抖动参数之前, 可以先确定没有丢失报 文后再测量, 从而使测量得到的帧延时参数和帧延时抖动参数更加准 确。 当然, 也可以不先确定是否丢失报文, 而直接测量帧延时参数和帧 延时抖动参数。
单向测量帧延时参数的过程
发送方发送的按照表 1 构造的 loopback request 报文中携带 TimeStamp Sent BIP16和 Sequence Number, 接收方接收到该 4艮文后, 根据该报文携带的 BIP16进行合法性检查,根据该报文携带的 Sequence Number进行报文是否丢失的检查。 如果该报文通过检查, 则根据该报 文携带的 TimeStamp Sent和自身接收到该报文的时间得到单向帧延时参 数。将自身接收到该报文的时间设定为 RT,将该报文携带的 TimeStamp Sent设定为 ST, 计算单向帧延时参数 FD为: FD = RT-ST+t, 其中, t 是接收方和发送方之间的基准时钟的差值。
在本发明中, 由于 loopback request不止发送一个且是依次发送的, 所以接收方可以依次计算每个 loopback request的单向帧延时参数后,取 平均值, 得到最终的单向帧延时参数。
双向测量帧延时参数的过程
发送方发送的按照表 1 构造的 loopback request 报文中携带 P T/CN2006/001288
TimeStamp Sent、 BIP16和 Sequence Number, 接收方接收到该 4艮文后, 在按照单向帧延时参数过程计算帧延时参数的同时, 还根据 loopback request报文携带的信息按照表 2构造 loopback reply报文发送给接收方 , 该报文携带 TimeStamp Received、 BIP16和 Sequence Number, 发送方接 收到 loopback reply报文后, 根据该报文携带的 BIP16进行合法性检查, 根据该报文携带的 Sequence Number进行报文是否丢失的检查。 如果该 报文通过检查, 则根据该报文携带的 TimeStamp Received和自身接收到 该报文的时间得到单向帧延时参数。 将自身接收到该报文的时间设定为 RT, 将该报文携带的 TimeStamp Received设定为 ST, 计算双向帧延时 参数 FD为: FD = RT-ST+t, 其中, t是接收方和发送方之间的基准时钟 的差值。
在本发明中, 由于 loopback reply不止发送一个且是依次发送的 ' 所以发送方可以依次计算每个 loopback reply的单向帧延时参数后, 取 平均值, 得到最终的单向帧延时参数。
在双向测量 MPLS网络性能参数时, 如果可以获取接收方的对报文 合法性检查的处理时间, 则可以在计算帧时延参数过程中去除接收方对 报文合法性检查的处理时间值, 以提高帧延时测量的精度。
本发明利用单向测量得到的帧延时参数或双向得到的帧延时参数, 计算获得相应的帧延时抖动参数。
当利用单向测量得到的帧延时参数时,帧延时抖动参数 = FD2-FD1 , 即相邻两个 loopback request报文的帧延时参数的差值。
当利用双向得到的帧延时参数时, 帧延时抖动参 ¾ = FD2-FD1 , 即 相邻两个 loopback reply报文的帧延时参数的差值。
为了提高测量帧延时抖动测量的准确性, 也可以采用多次帧延时抖 动的测量结果取平均值的方法进行帧延时抖动参数的测量, 将得到的平 P T/CN2006/001288 均值作为最终的帧延时抖动参数的测量结果。
测量帧丟失参数的过程
帧丟失参数的测量是指在一段时间内, 如 1 秒内, 发送方发送的 loopback request 4艮文数和接收到的 loopback repl 艮文数的差值。
帧丢失参数 = |FT2 -FT1|- |FR2-FR1|;
其中, FT表示发送方在配置规定的时间段内, 如 1 秒内, 发送的 loopback request报文数, FR表示发送方在规定的时间段内, 如 1秒内, 接收到的 loopback repl 报文数。 将分别对帧丟失参数、 帧延时参数、 帧延时抖动参数及帧吞吐量的测量 进行详细说明。
帧丢失参数的测量
为了测量帧丟失参数, 本发明可以采用帧丟失测量 (Frame Loss Measurement )报文作为性能参数测量报文, 将该报文在 MPLS 网络中 传送, 该报文具体包括帧丢失测量请求(FL-Request )报文和帧丟失测 量回应 (FL-Reply )报文, 结构如表 3所示:
Figure imgf000015_0001
表 3
本发明通过不同的 Function type区分请求报文和回应报文, 两种报 文的 Function type需要根据 Y.1711中的编码决定。
下面结合表 3所述的报文结构对帧丟失参数的测量过程进行详细说 明。
在发送方, 即 Ingress LSR, 以及接收方, 即 Egress LSR分别设置 有帧计数器, 分别用于对发送和接收到的报文进行计数。 当进行帧丢失 参数测量时,在 Ingress LSR和 Egress LSR上分别使能帧丟失参数测量。 由 Ingress LSR周期性发送 FL-Request报文, 携带发送报文计数值 ( IngressTxFrmCnt ) , 在 FL-Request 报文中, 接收报文计数值 ( EgressRxFrmCnt )无意义; Egress LSR接收到 FL-Request报文后, 构 造 FL-Reply报文后发送给 Ingress LSR, 在该 FL-Reply报文中拷贝 FL-Request报文中的 IngressTxFrmCnt且携带 EgressRxFrmCnt; Ingress LSR接收到 FL-Reply报文后, 计算得到帧丢失参数: FT2 -FT1)- |FR2-FR1|, 其中, FT表示 Ing ress LSR在测量巾贞丢失参数时读取的发送 报文总数, FR表示 Egress LSR接收到的报文总数。
为了测量帧丟失参数, 需要在 Ingress和 Egress LSR中同时配置帧 丢失参数测量使能标识, 根据该标识参数决定是否进行帧丟失参数测 量。
另外, 在 Ingress LSR中需要配置 FL-Request报文发送间隔, 相应 的默认值可以为 100ms。
表 3中所示报文结构中其他域值可以按照表 1所示的报文结构或表 2所示的报文结构构造。
帧延时参数的测量
在测量帧延时参数时, 本发明可以采用帧延时测量请求 ( FD- equest )报文和帧延时测量回应 (FD-Reply )报文作为性能参数 测量艮文, 两个艮文结构都如表 4所示:
Function Reserve Sequence LSP 发 送 时 间 戳 Padding BIP16 type Number TTSI ( IngressTimeStamp Sent ) 1 octets 1 octets 2 octets 20 octets 4 octets 10 octets 2 octets 表 4
同样地, 通过不同的 Function type区分请求报文和回应报文, 两种 报文的 Function type需要根据 Y.1711中的编码决定。
表 4所示报文中的 Ingress TimeStamp Sent是指相对于发送方的时钟 的 time-of-day (相对于一天的时间), Egress TimeStamp Sent是指相对 于接收方的时钟的 time-of-day (相对于一天的时间)。
在进行帧参数延时测量时, 在 Ingress LSR和 Egress LSR中分别使 能帧延时参数测量。 由 IngressLSR主动发出 FD-Request报文, 携带 Ingress TimeStamp Sent; Egress LSR 收到 FD-Request 才艮文后构造 FD-Reply 艮文 , 回应 Ingress LSR,拷贝请求艮文中的 Ingress TimeStamp Sent。
为了测量帧延时参数, 需要在 Ingress LSR和 Egress LSR同时配置 帧延时参数测量使能标识, 根据该标识参数决定是否进行帧延时参数测 量; 同时, 还在 Ingress LSR中配置 FD-Request报文的发送间隔, 该参 数的默认值可以设置为 100ms。
表 4中所示报文结构中其他域值可以按照表 1所示的报文结构或表 2所示的 4艮文结构构造。
同样地, 在进行帧延时参数测量的过程中, 可以通过单向帧延时参 数测量和双向帧延时测量两种方式。 下面将分别对两种方式进行说明。
( 1 ) 单向延时参数测量
Ingress LSRJ^_送 FD-Request报文, 在报文中携带 Ingress TimeStamp Sent, Egress LSR接收到 FD-Request报文后, 对报文合法性检查, 合法性 检查包括针对序列号的检查, 当序列号不是期望收到的报文序列号时, 则忽略该报文, 如果经过合法性检查确认该报文有效, 则记录接收到 FD-Request才艮文的时间 Egress TimeStamp Received和接收到的 FD-Request拫文中携带的发送时间 Ingress TimeStamp Sent计算单向时延 参数。 所述的单向时延参»0 = 1丁- 8丁"^, 其中, t是 Ingress LSR和 Egress LSR之间的时钟差。
在该方法中,要求 MPLS网络中发送方和接收方时钟同步, 或 Egress LSR已知发送方和接收方之间的时钟差值。
( 2 )汉向延时测量
Ingress LSR^-送 FD- Request报文, 在报文中携带 Ingress TimeStamp Sent, Egress LSR收到 FD-Request报文后, 构造所述的 FD-Reply报文。 11¾ 633 1^1收到?0-1 6 报文后, 对报文合法性检查, 合法性检查包括 针对序列号的检查, 当序列号不是期望收到的报文序列号时, 则忽略该 报文, 如果经过合法性检查确认报文有效, 则记录接收到 FD-Reply报文 的时间值 Ingress TimeStamp Received , 和 FD-Reply报文中携带的 Ingress TimeStamp Sent ( ST ) 比较, 得到双向延时参数: FD = RT - ST。 由于 所述双向时延参数中包含了接收端的处理时间, 所以在延时测量过程中 为保证测量的准确性可以将相应的处理时间去除。
因此, 为 了使得双向延时参数测量更加准确
FD-Request/FD-Reply报文中增加两个域, 如表 5所示:
Figure imgf000018_0001
表 5
其中, Ingress TimeStamp Sent域承载的信息表示 Ingress LSR发送
FD-Request时的时间戳; Egress TimeStamp Received域承载的信息表示 Egress LSR接收到 FD-Request时的时间戳; Egress TimeStamp Sent域承载 的信息表示 Egress LS 送 FD-Reply的时间戳。
如果用 Ingress TimeStamp Received^示 Ingress LSR收到 FD-Reply的 时间值, 此时时延参数计算如下: FD = ( Ingress TimeStamp Received - Ingress TimeStamp Sent ) - ( Egress TimeStamp Sent一 Egress TimeStamp Received ) 。
通过增加两个时间域, 可以比较准确的计算帧时延参数, 而不再包 含接收方处理艮文的时间。
帧延时抖动参数的测量
在本发明中, 利用连续两次帧延时参数, 便可以测量获得需要的帧 延时抖动参数。
利用单向帧延时测量, 则帧延时抖动参数= FD2 - FD1。
利用双向帧延时测量, 则帧延时抖动参数= FD2 - FD1。
也可以采用多次测量取平均值的方法, 得到统计平均值。
帧吞吐量参数测量
吞吐量和传输报文的帧大小相关, 测量吞吐量时可以利用帧吞吐量 请求(LB-Req )报文和帧吞吐量响应(LB-Res )报文实现, 具体为在报 文的填充域中填充不同长度的数据,对每种长度的报文逐步增加 LB-Req 发送速率, 记录 LB-Res是否出现丟帧。 当出现明显丟帧时记录 LB-Req 报文的发送速率, 即作为吞吐量的测量结果。
用于测量吞吐量的 LB-Req和 LB-Res报文格式如表 6所示:
Figure imgf000019_0001
表 6
当然, 在判断 LB-Res是否出现丟帧时, 可以采用所携带的序列号进 行判断, 如果 LB-Res携带发送报文计数值和接收报文计数值, 也可以采 用公式 |FT2 - FT1|-|FR2- FR11进行判断。
综上所述, 本发明对 MPLS网络的性能参数测量做了详细的规定, 具体包括对帧延时参数、 帧延时抖动参数、 帧吞吐量参数及帧丟失参数 的测量, 为规划 MPLS网络提供了重要的参考, 并为现有 MPLS网络中 SLA符合度的检查提供了依据。
以上所述的具体实施例, 对本发明的目的、 技术方案和有益效果进 行了进一步详细说明, 所应理解的是, 以上所述仅为本发明的具体实施 例而已, 并不用于限制本发明, 凡在本发明的精神和原则之内, 所做的 任何修改、 等同替换、 改进等, 均应包含在本发明的保护范围之内。

Claims

权利要求书
1、 一种测量多协议标签交换 MPLS 网絡性能参数的方法, 其特征 在于, 该方法包括:
A、 发送方将性能参数测量报文发送给接收方, 该性能参数测量报 文携带用于测量 MPLS网络性能参数的信息;
B、 接收方根据接收到的由性能参数测量报文携带的信息进行相应 MPLS网络性能参数的测量。
2、 如权利要求 1所述的方法, 其特征在于, 在步驟 B之后, 该方 法还包括:
C、 接收方将性能参数测量报文的回应报文发送给发送方, 该回应 报文携带用于测量 MPLS网络性能参数的信息;
D、 发送方根据接收到的由回应报文携带的信息进行相应 MPLS网 络性能参数的测量。
3、 如权利要求 2所述的方法, 其特征在于, 步骤 C所述用于测量 MPLS网络性能参数的信息包括用于测量帧丢失参数的序列号, 该序列 号按照所发送的回应报文的先后顺序依次加 1 , 第一个向接收方发送的 参数测量报文的序列号设置为 1;
步骤 D所述进行 MPLS网络性能参数的测量为帧丢失参数的测量, 过程为: 在未接收到回应报文时, 发送方设置当前接收到的回应报文的 序列号为 0, 在依次接收到回应报文时检查所携带的序列号是否符合: 所期望收到下一个序列号 = (当前接收到回应报文携带的序列号 + 1 ) mod 216,其中 mod表示余数,如果符合,则测量得到的帧丟失参数为 0, 如果不符合, 则测量得到的帧丟失参数根据当前接收到回应报文携带的 序列号与所期望收到的下一个序列号之间的差值确定。
4、 如权利要求 2所述的方法, 其特征在于, 步骤 C所述用于测量 MPLS网络性能参数的信息包括用于测量帧丢失参数的发送报文计数器 值和接收报文计数器值;
步骤 D所述进行 MPLS网络性能参数的测量为帧丟失参数的测量, 过程为:发送方接收到回应报文后,根据回应报文携带的信息按照 |FT2 -FT1卜 |FR2-FR1|计算得到帧丢失参数, 其中, FT表示发送方从回应报 文中得到的发送计数器值, FR表示发送方从回应报文中得到的接收计 数器值。
5、 如权利要求 4所述的方法, 其特征在于, 步骤 A所述的用于测 量 MPLS网络性能参数的信息包括用于测量帧丢失参数的发送报文计数 器值;
步骤 C所述的发送报文计数器值与所述步骤 B接收到的性能参数测 试报文中的发送报文计数器值相同。
6、 如权利要求 4所述的方法, 其特征在于, 所述的性能参数测量报 文为帧丢失测量请求 FL-Request报文;所述的回应报文为帧丢失测量回 应 FL-Reply 4艮文。
7、如权利要求 4所述的方法, 其特征在于, 在发送方和接收方设置 帧丟失参数测量使能标识, 在步骤 A之前, 该方法还包括:
发送方判断是否设置了帧丢失参数测量使能标识, 如果是, 执行步 驟 A; 否则, 不执行所述方法;
在步骤 C之前, 该方法还包括: 接收方判断是否设置了帧丟失参数 测量使能标识, 如果是, 执行步骤 C; 否则, 不执行所述方法。
8、 如权利要求 2所述的方法, 步骤 C所述用于测量 MPLS网络性 能参数的信息包括用于测量帧延时参数的发送时间戳, 该发送时间戳与 步骤 A中的用于测量帧延时参数的发送时间戳相同;
步骤 D所述进行 MPLS网络性能参数的测量为帧延时参数的测量, 过程为: 发送方接收到回应报文后, 将接收该报文的时间与该报文携带 的发送时间戳之差作为双向测量得到的帧延时参数。
9、如权利要求 8所述的方法, 其特征在于, 所述的帧延时参数的测 量是在进行了报文合法性检测和帧丢失参数检测确定未丢失帧后进行。
10、 如权利要求 2所述的方法, 其特征在于, 步骤 C所述的用于测 量 MPLS网络性能参数的信息还包括用于测量帧延时参数的发送方发送 时间戳、 接收方接收时间戳和接收方发送时间戳,
步骤 D所述进行 MPLS网络性能参数的测量为帧延时参数的测量 , 过程为: 发送方接收到回应报文后, 将接收到该报文的时间与该报文携 带的发送方发送时间戳之差, 再与该报文携带的接收方接收时间戳和接 收方发送时间戳之差之间的差值作为双向测量得到的帧延时参数。
11、 如权利要求 8或 10所述的方法, 其特征在于, 所述的性能参数 测量报文为帧延时测量请求 FD-Request报文,所述的回应报文为帧延时 测量回应 FD-Reply报文。
12、如权利要求 8或 10所述的方法, 其特征在于, 在发送方和接收 方设置帧延时参数测量使能标识, 在步骤 A之前, 该方法还包括:
发送方判断是否设置了帧延时参数测量使能标识, 如果是, 执行步 骤 A; 否则, 不执行所述方法;
在步骤 C之前, 该方法还包括: 接收方判断是否设置了帧延时参数 测量使能标识, 如果是, 执行步骤 C; 否则, 不执行所述方法。
13、 如权利要求 8或 10所述的方法, 其特征在于, 该方法还包括: 步骤 D所述进行 MPLS网络性能参数的测量为帧延时抖动参数的测量, 帧延时抖动参数为两个依次发送的回应报文的帧延时参数的差值。
14、 如权利要求 2所述的方法, 其特征在于, 步骤 A所述性能参数 测量报文的数目为一个以上, 在每个性能参数报文携带的用于测量 MPLS网络性能参数的信息包括用于测量帧吞吐量参数的定长数据, 依 次发送该一个以上的性能参数报文时, 逐步增加发送速率;
步骤 C所述的用于测量 MPLS网络性能参数的信息包括用于测量帧 吞吐量参数的定长数据;
步骤 D所述进行 MPLS网络性能参数的测量为测量帧吞吐量参数, 过程为: 发送方判断是否出现丟帧, 如果是, 则将该回应报文对应的性 能参数测量报文的发送速率作为测量得到的帧吞吐量参数; 否则, 继续 接收回应报文。
15、如权利要求 14所述的方法, 其特征在于, 所述的性能参数测量 4艮文为帧吞吐量请求 LB-Req报文, 所述的回应报文为帧吞吐量响应
LB-Res报文。
16、 如权利要求 1所述的方法, 其特征在于, 步骤 A所述用于测量 MPLS网络性能参数的信息为用于测量帧丢失参数的序列号, 该序列号 按照所发送的性能参数测量报文的先后顺序依次加 1 , 第一个向接收方 发送的参数测量报文的序列号设置为 1;
步驟 B所述进行 MPLS网络性能参数的测量为帧丢失参数的测量, 过程为: 在未接收到性能参数测量报文时, 接收方设置当前接收到的性 能参数测量报文的序列号为 0, 在依次接收到参数测量报文时检查所携 带的序列号是否符合: 所期望收到下一个序列号 - (当前接收到性能 参数测量报文携带的序列号 + 1 ) mod 216, 其中 mod表示余数, 如果 符合, 则测量得到的帧丟失参数为 0, 如果不符合, 则测量得到的帧丢 失参数根据当前接收到性能参数测量报文所携带的序列号与所期望收 到的下一个序列号之间的差值确定。
17、如权利要求 1所述的方法, 步骤 A所述用于测量 MPLS网络性 能参数的信息为用于测量帧延时参数的发送时间戳; 步驟 B所述进行 MPLS网络性能参数的测量为帧丟失参数的测量, 过程为: 接收方接收到性能参数测量报文后, 将接收该报文的时间与该 报文携带的发送时间戳之差再加上接收方和发送方之间的时钟差作为 测量得到的单向帧丟失参数。
18、 如权利要求 17所述的方法, 其特征在于, 该方法还包括: 步骤 B所述进行 MPLS网络性能参数的测量为帧延时抖动参数的测 量, 该帧延时抖动参数为两个依次发送的性能参数测量报文的帧延时参 数的差值。
19、如权利要求 17所述的方法, 其特征在于, 所述的帧延时参数的 行的。
20、 如权利要求 1所述的方法, 其特征在于, 所述的性能参数测量 报文为环回请求 loopback request报文, 所述的回应 4艮文为环回回应 loopback reply报文。
21、 如权利要求 1所述的方法, 其特征在于, 步骤 A所述的发送性 能测量报文的间隔是预先设定的。
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