CN117749664A - Time delay measuring method, electronic device and computer readable medium - Google Patents
Time delay measuring method, electronic device and computer readable medium Download PDFInfo
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- CN117749664A CN117749664A CN202211114701.9A CN202211114701A CN117749664A CN 117749664 A CN117749664 A CN 117749664A CN 202211114701 A CN202211114701 A CN 202211114701A CN 117749664 A CN117749664 A CN 117749664A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
- H04L43/106—Active monitoring, e.g. heartbeat, ping or trace-route using time related information in packets, e.g. by adding timestamps
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Abstract
The disclosure provides a delay measurement method applied to a source node, comprising the following steps: generating a time delay measurement Operation Administration and Maintenance (OAM) message according to a time record table, wherein the time record table records the sending time stamp of the service message of the service flow to be tested, and the time delay measurement OAM message carries the sending time stamp information of at least one target service message of the service flow to be tested; and sending the time delay measurement OAM message. A delay measurement method applied to a sink node comprises the following steps: receiving a time delay measurement OAM message, and extracting the sending time stamp information of at least one target service message of a service flow to be tested carried by the time delay measurement OAM message; extracting a receiving time stamp of the target service message from a time record table according to the sending time stamp information of the target service message, wherein the receiving time stamp of the service message of the service stream to be tested is recorded in the time record table; and calculating the time delay of the target service message. The disclosure also provides an electronic device, a computer readable medium.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a delay measurement method, an electronic device, and a computer readable medium.
Background
The internet engineering task force (IETF, the Internet Engineering Task Force) RFC6374 draft proposes an end-to-end multiprotocol label switching (MPLS, multi-Protocol Label Switching) network performance measurement protocol, and quality of service (QoS, quality of Service) indexes supporting measurement include packet loss rate, delay, jitter, throughput, and the like, and two end nodes perform performance measurement by establishing connection and inter-operation management maintenance (OAM, operation Administration and Maintenance) messages, as shown in fig. 1, a source node a sends a Query OAM message to a sink node B, after receiving the Query OAM message, the sink node B optionally sends a Response OAM message back to the source node a, and calculation of performance parameters may be performed at the source node a or at the sink node B.
An encapsulated format of an OAM message in RFC6374 draft is shown in fig. 2, where an OAM message Type carried by the OAM message is indicated by a Channel Type (Channel Type) field value. In the RFC6374 draft, 5 new Channel Type field value indications are defined to carry 5 new OAM messages for passive packet loss measurement, active delay measurement, passive packet loss plus active delay measurement, and active packet loss plus active delay measurement, respectively. The encapsulated format of the OAM packet as shown in fig. 2 further includes a GAL field, a Version (Version) field, a Reserved (Reserved) field, and a G-Ach message field. The OAM message format and measurement method for passive latency measurement are not defined in RFC6374 draft.
When the RFC6374 draft is used for measuring the unidirectional time delay, a source node sends out a time delay measurement OAM message and records a sending time stamp in the OAM message, and a sink node records a receiving time stamp of the OAM message, so that the unidirectional time delay is calculated according to the sending time stamp and the receiving time stamp. However, such an active delay measurement method based on OAM packets has a disadvantage of low accuracy, and in addition, the active delay measurement method may require a large amount of OAM packets to be injected into the network. Deterministic network (DetNet, deterministic Networking) MPLS networks require accurate delay measurement capability, and the use of RFC6374 draft for measuring unidirectional delay of DetNet MPLS traffic fails to meet the requirements of DetNet MPLS networks.
Disclosure of Invention
The embodiment of the disclosure provides a time delay measuring method, electronic equipment and a computer readable medium.
In a first aspect, an embodiment of the present disclosure provides a delay measurement method, including:
generating a time delay measurement OAM message according to a time record table, wherein the time record table records the sending time stamp of the service message of the service flow to be tested, and the time delay measurement OAM message carries the sending time stamp information of at least one target service message of the service flow to be tested;
And sending the time delay measurement OAM message.
In some embodiments, generating the delay measurement OAM message from the time log table includes:
determining the message format of the time delay measurement OAM message;
extracting the sending time stamp of the target service message from the time record table according to the message format;
and constructing the time delay measurement OAM message according to the message format, wherein the time delay measurement OAM message carries the sending time stamp information and the message format information of each target service message.
In some embodiments, the delay measurement OAM packet includes a message format field, a traffic flow identification field, a timestamp information field;
the value of the message format field characterizes the message format;
the service flow identification field carries a service flow identification of the service flow to be tested;
and the timestamp information field carries the sending timestamp information of each target service message.
In some embodiments, the timestamp information field includes a starting message sequence number field, a starting timestamp field, a sequence number interval field, a sequence number field, and a timestamp offset field, where each of the target service messages corresponds to one of the timestamp offset fields;
The initial message sequence number field carries the sequence number of the first target service message, wherein each target service message is ordered according to the sequence number;
the initial timestamp field carries a sending timestamp of the first target service message;
the value of the sequence number interval field represents the difference value of the sequence numbers of two adjacent target service messages;
the value of the sequence number field characterizes the number of sequence numbers carried by the time delay measurement OAM message;
the value of the timestamp offset field characterizes the offset value of the sending timestamp of the corresponding target service message relative to the first target service message.
In some embodiments, the timestamp information field includes a sequence number field, and a timestamp field, where each of the target service packets corresponds to one of the sequence number field and one of the timestamp field;
the value of the sequence number field characterizes the number of sequence numbers carried by the time delay measurement OAM message;
the sequence number field carries the sequence number of the corresponding target service message;
and the timestamp field carries a corresponding sending timestamp of the target service message.
In some embodiments, the delay measurement OAM message further includes a message type field;
the message type field carries a value characterizing that the type of the delay measurement OAM message is a passive delay measurement OAM message.
In some embodiments, determining the message format of the delay measurement OAM message includes:
and determining the message format according to the time recording rule corresponding to the service flow to be detected.
In some embodiments, extracting the transmission timestamp of the at least one target service message from the time record table includes:
determining the serial number of each target service message according to the message format;
and extracting the sending time stamp of the target service message from the time record table by taking the service flow identifier of the service flow to be detected and the serial number of the target service message as indexes.
In some embodiments, before generating the delay measurement OAM message according to the time record table, the method further includes:
when the service message of the service flow to be tested is sent, the sending time stamp of the service message is recorded in the time record table.
In some embodiments, recording the sending timestamp of the service message in the time recording table includes:
Determining a time recording rule of the service flow to be tested;
recording a service flow identifier of a service flow to be tested, a serial number of a first service message and a sending time stamp of the first service message into the time recording table according to a time recording rule of the service flow to be tested, wherein the first service message is a service message meeting the time recording rule of the service flow to be tested in the service flow to be tested.
In some embodiments, determining the time recording rule of the service flow to be measured includes:
and determining the time recording rule of the service flow to be detected according to a time recording rule table, wherein the time recording rule table is configured with the time recording rule of the service flow.
In some embodiments, the time recording rule comprises:
recording a sending time stamp of each service message of the service flow to be tested;
recording the sending time stamp of the service message according to the preset sequence number interval by taking the service message with the sequence number in the service stream to be tested as a starting point;
and continuously recording the sending time stamps of the service messages with a preset number by taking the service messages with the sequence numbers in the service flow to be tested as a starting point.
In a second aspect, an embodiment of the present disclosure provides a delay measurement method, including:
Receiving a time delay measurement OAM message, and extracting the sending time stamp information of at least one target service message of a service flow to be tested carried by the time delay measurement OAM message;
extracting a receiving time stamp of the target service message from a time record table according to the sending time stamp information of the target service message, wherein the receiving time stamp of the service message of the service stream to be tested is recorded in the time record table;
and calculating the time delay of the target service message.
In some embodiments, extracting the transmission timestamp information of the at least one target service packet of the service flow to be measured carried by the delay measurement OAM packet includes:
determining the message format of the time delay measurement OAM message according to the message format information carried by the time delay measurement OAM message;
and extracting the sending time stamp information of each target service message from the time delay measurement OAM message according to the message format.
In some embodiments, the delay measurement OAM packet includes a message format field, a traffic flow identification field, a timestamp information field; extracting the sending timestamp information of at least one target service message of the service flow to be measured carried by the time delay measurement OAM message comprises the following steps:
Determining the message format of the delay measurement OAM message according to the value of the message format field;
extracting a service flow identifier of the service flow to be detected, which is carried by the service flow identifier field;
and extracting the sequence number and the sending timestamp of the target service message from the timestamp information field according to the message format.
In some embodiments, the timestamp information field includes a starting message sequence number field, a starting timestamp field, a sequence number interval field, a sequence number field, and a timestamp offset field, where each of the target service messages corresponds to one of the timestamp offset fields; extracting the sequence number and the sending timestamp of the target service message from the timestamp information field according to the message format, wherein the sequence number and the sending timestamp comprise:
determining the number of sequence numbers carried by the time delay measurement OAM message according to the value of the sequence number field;
extracting the sequence number of the first target service message carried by the sequence number field of the initial message, wherein the target service messages are ordered according to the sequence number;
extracting a sending time stamp of the first target service message carried by the starting time stamp field;
Determining the sequence number of each target service message according to the sequence number of the first target service message and the value of the sequence number interval field;
and determining the sending time stamp of each target service message according to the sending time stamp of the first target service message and the value of the time stamp offset field corresponding to each target service message.
In some embodiments, the timestamp information field includes a sequence number field, and a timestamp field, where each of the target service packets corresponds to one of the sequence number field and one of the timestamp field; extracting the sequence number and the sending timestamp of the target service message from the timestamp information field according to the message format, wherein the sequence number and the sending timestamp comprise:
determining the number of sequence numbers carried by the time delay measurement OAM message according to the value of the sequence number field;
extracting the sequence number of the corresponding target service message carried by the sequence number field;
and extracting the sending time stamp of the corresponding target service message carried by the time stamp field.
In some embodiments, extracting the receiving timestamp of the target service message from the time record table according to the sending timestamp information of the target service message includes:
And extracting the receiving time stamp of the target service message from the time record table by taking the service flow identifier of the service flow to be detected and the sequence number of the target service message as indexes.
In some embodiments, the delay measurement OAM message further includes a message type field; receiving a time delay measurement OAM message, extracting the sending timestamp information of at least one target service message of a service flow to be tested carried by the time delay measurement OAM message, and comprising the following steps:
receiving the time delay measurement OAM message;
and extracting the sending time stamp information of at least one target service message of the service flow to be tested carried by the time delay measurement OAM message under the condition that the value of the message type field represents that the type of the time delay measurement OAM message is a passive time delay measurement OAM message.
In some embodiments, the method further comprises:
when receiving the service message of the service flow to be tested, recording the receiving time stamp of the service message in the time record table.
In some embodiments, recording the reception timestamp of the service message in the time recording table includes:
determining a time recording rule of the service flow to be tested;
recording a service flow identifier of a service flow to be tested, a serial number of a second service message and a receiving timestamp of the second service message into the time recording table according to a time recording rule of the service flow to be tested, wherein the second service message is a service message meeting the time recording rule of the service flow to be tested in the service flow to be tested.
In some embodiments, determining the time recording rule of the service flow to be measured includes:
and determining the time recording rule of the service flow to be detected according to a time recording rule table, wherein the time recording rule table is configured with the time recording rule of the service flow.
In some embodiments, the time recording rule comprises:
recording a receiving time stamp of each service message of the service flow to be tested;
recording the receiving time stamp of the service message according to the preset sequence number interval by taking the service message with the sequence number in the service stream to be tested as a starting point;
and continuously recording the receiving time stamps of a predetermined number of service messages by taking the service messages with the sequence numbers in the service flow to be tested as a starting point.
In a third aspect, an embodiment of the present disclosure provides an electronic device, including:
one or more processors;
and a memory having one or more programs stored thereon, which when executed by the one or more processors, cause the one or more processors to implement the latency measurement method according to the first aspect of the embodiments of the present disclosure and/or the latency measurement method according to the second aspect of the embodiments of the present disclosure.
In a fourth aspect, embodiments of the present disclosure provide a computer readable medium having stored thereon a computer program which, when executed by a processor, implements the method of latency measurement described in the first aspect of embodiments of the present disclosure and/or the method of latency measurement described in the second aspect of embodiments of the present disclosure.
In the embodiment of the disclosure, the sending time stamp of the service message of the service flow to be measured is recorded in the time record table of the source node of the service flow to be measured, the receiving time stamp of the service message of the service flow to be measured is recorded in the time record table of the sink node, when the time delay measurement is carried out on the service flow to be measured, the time delay measurement OAM message carrying the sending time stamp information of at least one target service message is generated according to the time record table, and the sending time stamp of the target service message is sent to the sink node by the sending time delay measurement OAM message, so that the sink node can calculate the real time delay of the target message according to the sending time stamp and the receiving time stamp, thereby realizing passive time delay measurement, improving the precision of time delay measurement, avoiding the influence of time delay measurement on normal service without injecting a large amount of OAM messages into a network.
Drawings
Fig. 1 is an end-to-end performance measurement OAM message interaction schematic;
Fig. 2 is a schematic diagram of an OAM message format;
FIG. 3 is a flow chart of a method of delay measurement;
FIG. 4 is a flow chart of some steps of another delay measurement method;
fig. 5 is a flow chart of a method of delay measurement;
FIG. 6 is a flow chart of some steps of another delay measurement method;
FIG. 7 is a block diagram of an electronic device;
FIG. 8 is a block diagram of the components of a computer readable medium;
FIG. 9 is a schematic diagram of a time recording table;
FIG. 10 is a schematic diagram of a time recording rule table;
fig. 11 is a schematic diagram of a delay measurement OAM message format;
FIG. 12 is a schematic illustration of a time recording table;
fig. 13 is a schematic diagram of a delay measurement OAM message format;
FIG. 14 is a schematic illustration of a time recording table;
fig. 15 is a schematic diagram of a delay measurement OAM message format.
Detailed Description
In order to better understand the technical solutions of the present disclosure, the time delay measurement method, the electronic device and the computer readable medium provided by the present disclosure are described in detail below with reference to the accompanying drawings.
Example embodiments will be described more fully hereinafter with reference to the accompanying drawings, but may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Embodiments of the disclosure and features of embodiments may be combined with each other without conflict.
As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In a first aspect, referring to fig. 3, an embodiment of the present disclosure provides a delay measurement method, including:
s11, generating a time delay measurement OAM message according to a time record table, wherein a transmission time stamp of a service message of a service flow to be tested is recorded in the time record table, and the time delay measurement OAM message carries transmission time stamp information of at least one target service message of the service flow to be tested;
s12, sending the time delay measurement OAM message.
In some embodiments, the generating of the delay measurement OAM message based on the OAM message format of the RFC6374 protocol specifically refers to improving the OAM message format specified by the RFC6374 protocol, so that the delay measurement OAM message can carry the sending timestamp information of at least one target service message of the service flow to be measured, thereby enabling passive delay measurement.
In the embodiment of the disclosure, when a source node of a service flow to be tested sends a service message, a sending timestamp of the service message is recorded in a time record table. And when the time delay of the service message of the service flow to be measured is measured, generating a time delay measurement OAM message carrying the sending time stamp information of at least one target service message according to the time record table. It should be noted that the target service message refers to one of the service messages recorded with the transmission time stamp in the time record table.
In the embodiment of the present disclosure, sending the delay measurement OAM packet refers to sending the delay measurement OAM packet from a source node of a service flow to be measured to a sink node of the service flow to be measured.
The embodiment of the disclosure does not particularly limit the timestamp information carried by the delay measurement OAM message. The time stamp information is information enabling the sink node to determine the transmission time stamp of the target service message.
It should be noted that, in the embodiment of the present disclosure, when performing delay measurement, a sending timestamp of a service packet of a service flow to be measured is sent to a destination node by a source node by sending a delay measurement OAM packet, and the delay of a real service packet of the service flow to be measured is measured instead of the delay of the OAM packet, thereby implementing passive delay measurement.
In the delay measurement method provided by the embodiment of the disclosure, the transmission time stamp of the service message of the service flow to be measured is recorded in the time record table of the source node of the service flow to be measured, when the delay measurement is performed on the service flow to be measured, the delay measurement OAM message carrying the transmission time stamp information of at least one target service message is generated according to the time record table, and the transmission time stamp of the target service message is transmitted to the sink node by the transmission time stamp measurement OAM message, so that the sink node can calculate the real delay of the target message, thereby realizing passive delay measurement, improving the precision of delay measurement, avoiding the influence of delay measurement on normal service because of massive injection of OAM messages into the network.
The embodiment of the disclosure does not particularly limit how the delay measurement OAM message carries the transmission rate timestamp information, and the format of the delay measurement OAM message.
In some embodiments, generating the delay measurement OAM message from the time log table includes: determining the message format of the time delay measurement OAM message; extracting the sending time stamp of the target service message from the time record table according to the message format; and constructing the time delay measurement OAM message according to the message format, wherein the time delay measurement OAM message carries the sending time stamp information and the message format information of each target service message.
It should be noted that, in the embodiment of the present disclosure, determining the message format of the delay measurement OAM packet refers to a process of planning the target service packet carried by the delay measurement OAM packet. For example, determining the number of time stamps of the target service message carried by the delay measurement OAM message, determining the sequence number of the carried target service message, determining the manner of carrying the transmission time stamp information, and the like, which are not particularly limited in the embodiments of the present disclosure.
After the message format of the delay measurement OAM message is determined, namely, after the target service message carried by the delay measurement OAM message is planned, the sending timestamp of the target service message can be extracted from the time record table according to the message format, and the delay measurement OAM message is constructed according to the message format.
The embodiment of the disclosure defines an OAM message format for passive delay measurement, and can carry the sending timestamp information of the target service message.
In some embodiments, the delay measurement OAM packet includes a message format field, a traffic flow identification field, a timestamp information field; the value of the message format field characterizes the message format; the service flow identification field carries a service flow identification of the service flow to be tested; and the timestamp information field carries the sending timestamp information of each target service message.
It should be noted that, in the embodiment of the present disclosure, the formats of the timestamp information fields in the delay measurement OAM messages corresponding to different message formats are different, that is, different message formats represent different timestamp information carrying manners.
In some embodiments, the message format field, the traffic flow identification field are defined in a fixed header and the timestamp information field is defined in a variable portion.
In some embodiments, the delay measurement OAM packet in the embodiments of the present disclosure is defined based on an improvement of the OAM protocol of RFC6374 draft, and the meaning of a Version (Version) field, a Flags (Flags) field, a Control Code (Control Code) field, a Message Length (Message Length) field, a QTF field, a session identification (Session Identifier) field, and a DS field in the fixed header of the delay measurement OAM packet in the embodiments of the present disclosure is consistent with the active delay measurement OAM packet encapsulation in the OAM protocol of RFC6374 draft. The OAM protocol based on the RFC6374 draft is improved to define a time delay measurement OAM message for passive time delay measurement, and the OAM protocol based on the RFC6374 draft can be compatible.
The format of the timestamp information field is not particularly limited in the embodiments of the present disclosure.
In some embodiments, the timestamp information field includes a starting message sequence number field, a starting timestamp field, a sequence number interval field, a sequence number field, and a timestamp offset field, where each of the target service messages corresponds to one of the timestamp offset fields; the initial message sequence number field carries the sequence number of the first target service message, wherein each target service message is ordered according to the sequence number; the initial timestamp field carries a sending timestamp of the first target service message; the value of the sequence number interval field represents the difference value of the sequence numbers of two adjacent target service messages; the value of the sequence number field characterizes the number of sequence numbers carried by the time delay measurement OAM message; the value of the timestamp offset field characterizes the offset value of the sending timestamp of the corresponding target service message relative to the first target service message.
In some embodiments, the timestamp information field includes a sequence number field, and a timestamp field, where each of the target service packets corresponds to one of the sequence number field and one of the timestamp field; the value of the sequence number field characterizes the number of sequence numbers carried by the time delay measurement OAM message; the sequence number field carries the sequence number of the corresponding target service message; and the timestamp field carries a corresponding sending timestamp of the target service message.
In some embodiments, the delay measurement OAM message further includes a message type field; the message type field carries a value characterizing that the type of the delay measurement OAM message is a passive delay measurement OAM message.
In the embodiment of the disclosure, the message type field is defined in the delay measurement OAM message, so that the sink node can identify the delay measurement OAM message for passive delay measurement according to the value of the message type field.
In some embodiments, consistent with the active latency measurement OAM message in the OAM protocol of RFC6374 draft, the message Type field is a Channel Type (Channel Type) field, and a Channel Type field value representing a passive latency measurement is assigned. The embodiment of the disclosure does not specifically limit the Channel Type field value representing the passive delay measurement, for example, when the Channel Type field value is 0x88, the passive delay measurement is represented.
The embodiment of the disclosure does not particularly limit how to determine the message format of the delay measurement OAM message.
In some embodiments, the source node may record the sending time stamp of the service packet of the service flow to be measured in the time record table according to different time record rules, where a time record rule refers to a rule that records the sending time stamp in the time record table when the service packet is sent, for example, whether to record the sending time stamp of the service packet of the service flow, which service packets are recorded, how many service packets are recorded, and so on. The transmission time stamps of the service messages recorded by different time recording rules may be different, so that the transmission time stamps of the target service messages carried by the delay measurement OAM messages may also be different. That is, in the embodiments of the present disclosure, the message format of the delay measurement OAM message has a correlation with the time recording rule that records the transmission time stamp of the traffic message.
Accordingly, in some embodiments, determining the message format of the delay measurement OAM message includes: and determining the message format according to the time recording rule corresponding to the service flow to be detected.
In the embodiment of the disclosure, the message format of the delay measurement OAM message is determined according to the time record rule corresponding to the service flow to be measured, so that the sending time stamp of the target service message can be extracted from the time record table.
The format of the time record table is not particularly limited in the embodiments of the present disclosure. In some embodiments, the time record table is indexed by a sequence number of the traffic message and a traffic flow identification of the traffic flow. And determining the sending time stamp of the service message carried by the message format, and determining the sequence number of the target service message, so that the sending time stamp of the target service message can be extracted from the time record table according to the service flow identification of the service flow to be detected and the sequence number of the target service message.
Accordingly, in some embodiments, extracting the transmission timestamp of the at least one target service packet from the time record table includes: determining the serial number of each target service message according to the message format; and extracting the sending time stamp of the target service message from the time record table by taking the service flow identifier of the service flow to be detected and the serial number of the target service message as indexes.
In some embodiments, referring to fig. 4, before generating the delay measurement OAM message according to the time record table, the method further includes:
and S13, when the service message of the service flow to be tested is sent, recording the sending time stamp of the service message in the time record table.
In some embodiments, the source node may record the sending time stamp of the service packet of the service flow to be measured in the time record table according to different time record rules, where a time record rule refers to a rule that records the sending time stamp in the time record table when the service packet is sent, for example, whether to record the sending time stamp of the service packet of the service flow, which service packets are recorded, how many service packets are recorded, and so on.
Accordingly, in some embodiments, recording the transmission time stamp of the service packet in the time recording table includes: determining a time recording rule of the service flow to be tested; recording a service flow identifier of a service flow to be tested, a serial number of a first service message and a sending time stamp of the first service message into the time recording table according to a time recording rule of the service flow to be tested, wherein the first service message is a service message meeting the time recording rule of the service flow to be tested in the service flow to be tested.
In an embodiment of the present disclosure, a time recording rule table is defined for configuring time recording rules of a traffic flow.
Accordingly, in some embodiments, determining the time recording rule of the service flow to be measured includes: and determining the time recording rule of the service flow to be detected according to a time recording rule table, wherein the time recording rule table is configured with the time recording rule of the service flow.
The time recording rule is not particularly limited in the embodiments of the present disclosure. For example, the time recording rule includes: the sending time stamp of the service message of the service flow is not recorded; recording a sending time stamp of each service message of the service flow to be tested; recording the sending time stamp of the service message according to the preset sequence number interval by taking the service message with the sequence number in the service stream to be tested as a starting point; and continuously recording the sending time stamps of the service messages with a preset number by taking the service messages with the sequence numbers in the service flow to be tested as a starting point.
In a second aspect, referring to fig. 5, an embodiment of the present disclosure provides a delay measurement method, including:
s21, receiving a time delay measurement OAM message, and extracting the sending time stamp information of at least one target service message of a service flow to be tested carried by the time delay measurement OAM message;
S22, extracting a receiving time stamp of the target service message from a time record table according to the sending time stamp information of the target service message, wherein the receiving time stamp of the service message of the service flow to be tested is recorded in the time record table;
s23, calculating the time delay of the target service message.
In some embodiments, the delay measurement OAM packet is generated based on an OAM packet format of RFC6374 protocol, specifically, generating the delay measurement OAM packet based on an OAM packet format of RFC6374 protocol refers to improving on the basis of an OAM packet format specified by RFC6374 protocol, so that the delay measurement OAM packet can carry transmission timestamp information of at least one target service packet of a service flow to be measured, thereby enabling passive delay measurement.
In the embodiment of the disclosure, a receiving timestamp of a service message of a service flow to be measured is recorded in a time record table of a sink node of the service flow to be measured, after receiving a delay measurement OAM message, the sink node can determine a sending timestamp of a target service message according to sending timestamp information of the target service message, extract the receiving timestamp of the target service message from the time record table, and obtain the delay of the target service message by subtracting the sending timestamp and the receiving timestamp of the target service message.
According to the delay measurement method provided by the embodiment of the disclosure, the sink node can calculate the real delay of the target message according to the sending timestamp and the receiving timestamp, so that the passive delay measurement is realized, the accuracy of the delay measurement is improved, and a large amount of OAM messages are not required to be injected into the network, thereby avoiding the influence of the delay measurement on normal service.
In some embodiments, the delay measurement OAM message sent by the source node carries message format information. The message format determines the number of time stamps of the target service message carried by the time delay measurement OAM message, the sequence number of the carried target service message, the mode of carrying and sending time stamp information and the like. The sink node can determine the message format of the delay measurement OAM message according to the message format information, and further extract the sending timestamp information carried by the delay measurement OAM message.
Accordingly, in some embodiments, extracting the transmission timestamp information of the delay measurement OAM packet carrying at least one target service packet of the service flow to be measured includes: determining the message format of the time delay measurement OAM message according to the message format information carried by the time delay measurement OAM message; and extracting the sending time stamp information of each target service message from the time delay measurement OAM message according to the message format.
The embodiment of the disclosure defines an OAM message format for passive delay measurement, and can carry the sending timestamp information of the target service message.
Accordingly, in some embodiments, the delay measurement OAM packet includes a message format field, a traffic flow identification field, a timestamp information field; extracting the sending timestamp information of at least one target service message of the service flow to be measured carried by the time delay measurement OAM message comprises the following steps: determining the message format of the delay measurement OAM message according to the value of the message format field; extracting a service flow identifier of the service flow to be detected, which is carried by the service flow identifier field; and extracting the sequence number and the sending timestamp of the target service message from the timestamp information field according to the message format.
The format of the timestamp information field is not particularly limited in the embodiments of the present disclosure.
In some embodiments, the timestamp information field includes a starting message sequence number field, a starting timestamp field, a sequence number interval field, a sequence number field, and a timestamp offset field, where each of the target service messages corresponds to one of the timestamp offset fields; extracting the sequence number and the sending timestamp of the target service message from the timestamp information field according to the message format, wherein the sequence number and the sending timestamp comprise: determining the number of sequence numbers carried by the time delay measurement OAM message according to the value of the sequence number field; extracting the sequence number of the first target service message carried by the sequence number field of the initial message, wherein the target service messages are ordered according to the sequence number; extracting a sending time stamp of the first target service message carried by the starting time stamp field; determining the sequence number of each target service message according to the sequence number of the first target service message and the value of the sequence number interval field; and determining the sending time stamp of each target service message according to the sending time stamp of the first target service message and the value of the time stamp offset field corresponding to each target service message.
In some embodiments, the timestamp information field includes a sequence number field, and a timestamp field, where each of the target service packets corresponds to one of the sequence number field and one of the timestamp field; extracting the sequence number and the sending timestamp of the target service message from the timestamp information field according to the message format, wherein the sequence number and the sending timestamp comprise: determining the number of sequence numbers carried by the time delay measurement OAM message according to the value of the sequence number field; extracting the sequence number of the corresponding target service message carried by the sequence number field; and extracting the sending time stamp of the corresponding target service message carried by the time stamp field.
The format of the time record table is not particularly limited in the embodiments of the present disclosure. In some embodiments, the time record table is indexed by a sequence number of the traffic message and a traffic flow identification of the traffic flow. The sink node determines the sequence number of the target service message and the service flow identifier of the service flow to be tested according to the transmission time stamp information carried by the time delay measurement OAM message, and further can extract the receiving time stamp of the target service message from the time record table according to the service flow identifier of the service flow to be tested and the sequence number of the target service message
In some embodiments, extracting the receiving timestamp of the target service message from the time record table according to the sending timestamp information of the target service message includes: and extracting the receiving time stamp of the target service message from the time record table by taking the service flow identifier of the service flow to be detected and the sequence number of the target service message as indexes.
In the embodiment of the disclosure, the message type field is defined in the delay measurement OAM message, and the sink node can identify the delay measurement OAM message for passive delay measurement according to the value of the message type field.
In some embodiments, consistent with the active latency measurement OAM message in the OAM protocol of RFC6374 draft, the message Type field is a Channel Type (Channel Type) field, and a Channel Type field value representing a passive latency measurement is assigned. The embodiment of the disclosure does not specifically limit the Channel Type field value representing the passive delay measurement, for example, when the Channel Type field value is 0x88, the passive delay measurement is represented.
Accordingly, in some embodiments the delay measurement OAM message further includes a message type field; receiving a time delay measurement OAM message, extracting the sending timestamp information of at least one target service message of a service flow to be tested carried by the time delay measurement OAM message, and comprising the following steps: receiving the time delay measurement OAM message; and extracting the sending time stamp information of at least one target service message of the service flow to be tested carried by the time delay measurement OAM message under the condition that the value of the message type field represents that the type of the time delay measurement OAM message is a passive time delay measurement OAM message.
In some embodiments, referring to fig. 6, the method further comprises:
and S24, when the service message of the service flow to be detected is received, recording the receiving time stamp of the service message in the time record table.
In some embodiments, the sink node may record the receiving time stamp of the service packet of the service flow to be measured in the time record table according to different time record rules, where the time record rule refers to a rule that records the receiving time stamp in the time record table when receiving the service packet, for example, whether to record the receiving time stamp of the service packet of the service flow, which service packets to record the receiving time stamp, how many service packets to record the receiving time stamp, and so on.
Accordingly, in some embodiments, recording the reception timestamp of the service packet in the time recording table includes: determining a time recording rule of the service flow to be tested; recording a service flow identifier of a service flow to be tested, a serial number of a second service message and a receiving timestamp of the second service message into the time recording table according to a time recording rule of the service flow to be tested, wherein the second service message is a service message meeting the time recording rule of the service flow to be tested in the service flow to be tested.
It should be noted that, in the embodiment of the present disclosure, a time recording rule of a sending timestamp of a service packet in a source node for recording a service flow to be measured is consistent with a time recording rule of an receiving timestamp of a service packet in a sink node for recording a service flow to be measured.
In an embodiment of the present disclosure, a time recording rule table is defined for configuring time recording rules of a traffic flow.
Accordingly, in some embodiments, determining the time recording rule of the service flow to be measured includes: and determining the time recording rule of the service flow to be detected according to a time recording rule table, wherein the time recording rule table is configured with the time recording rule of the service flow.
The time recording rule is not particularly limited in the embodiments of the present disclosure. For example, the time recording rule includes: the receiving time stamp of the service message of the service flow is not recorded; recording a receiving time stamp of each service message of the service flow to be tested; recording the receiving time stamp of the service message according to the preset sequence number interval by taking the service message with the sequence number in the service stream to be tested as a starting point; and continuously recording the receiving time stamps of a predetermined number of service messages by taking the service messages with the sequence numbers in the service flow to be tested as a starting point.
In a third aspect, referring to fig. 7, an embodiment of the present disclosure provides an electronic device, including:
one or more processors 101;
a memory 102 having one or more programs stored thereon, which when executed by one or more processors cause the one or more processors to implement the latency measurement method described in the first aspect of the disclosed embodiments and/or the latency measurement method described in the second aspect of the disclosed embodiments;
one or more I/O interfaces 103, coupled between the processor and the memory, are configured to enable information interaction of the processor with the memory.
Wherein the processor 101 is a device having data processing capabilities, including but not limited to a Central Processing Unit (CPU) or the like; memory 102 is a device with data storage capability including, but not limited to, random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically charged erasable programmable read-only memory (EEPROM), FLASH memory (FLASH); an I/O interface (read/write interface) 103 is connected between the processor 101 and the memory 102 to enable information interaction between the processor 101 and the memory 102, including but not limited to a data Bus (Bus) or the like.
In some embodiments, processor 101, memory 102, and I/O interface 103 are connected to each other via bus 104, and thus to other components of the computing device.
Fourth aspect, referring to fig. 8, an embodiment of the present disclosure provides a computer readable medium having a computer program stored thereon, which when executed by a processor implements the delay measurement method of the first aspect of the embodiment of the present disclosure and/or the delay measurement method of the second aspect of the embodiment of the present disclosure.
In order to enable those skilled in the art to more clearly understand the technical solutions provided by the embodiments of the present disclosure, the following details of the technical solutions provided by the embodiments of the present disclosure are described by specific embodiments:
example 1
This embodiment improves on the OAM protocol of the RFC6374 draft.
And allocating a value in the Channel Type of the G-Ach to indicate that the passive delay measurement OAM message is carried, and identifying and processing the passive delay measurement OAM message according to the Channel Type when the OAM entity receives the G-Ach message.
A table (called timeRecordTable) is added to the node to record the sending or receiving time stamp of the service message. When the traffic stream source node sends the traffic message, the sending time stamp of the traffic message is recorded in the table, the traffic stream identifier (flow-id) and the message serial number (seq-no) are used as indexes, similarly, when the traffic stream sink node receives the traffic message, the flow-id and the seq-no are also used as indexes to record the receiving time stamp (timestamp), and the format of the timeRecordTable is shown in figure 9.
The time stamp of which traffic messages is recorded for a traffic stream identified as flow-id depends on the node configuration. This embodiment adds a table (called timeRecordRule) in the node to indicate which service message records to send/receive timestamps. the timeRecordRule table entry uses flow-id as a key value, and further includes a rule type, initial Sequence No (initSeqNo), sequence No Offset (seqnoffset), and packet count, as shown in fig. 10, a rule type value of 0 indicates that all messages are time stamped, a rule type value of 1 indicates that all messages are not time stamped, a rule type value of 2 indicates that all messages are time stamped at intervals of 3 sequence numbers from sequence number 1 and 100 are recorded in total, a rule type value of 4 indicates that all messages are time stamped continuously recorded from sequence number 5, and the rule of the rule type can be flexibly customized, except for the rule described above, and the embodiment is not limited in any way. Generally, the same rules are configured on the traffic source and the destination nodes for the traffic flows of the same flow-id.
The passive delay measurement OAM packet fixed header format is defined as shown in fig. 11 (a), where the meaning of Version, flags, control Code, message Length, QTF, session Identifier and DS fields are consistent with the active delay measurement OAM packet encapsulation. The flow-id field is used to carry a service flow identifier to which the message belongs, and the FlowId Timestamp Record Type (FTRT) field indicates a manner of carrying a service message timestamp, that is, a variable part format of the passive delay measurement OAM message. For example, when the timeRecordRule is configured to record all service message time stamps or record time stamps of N service messages at intervals, the FTRT value may be defined as 1, and the variable part of the passive delay measurement message may be defined as shown in (b) of fig. 11, where the meaning of each field is as follows:
Initial Sequence No field: the service message serial number of the first time stamp carried by the OAM message;
initial Timestamp: the OAM message carries a first time stamp;
sequence No Offset (SNO): service message sequence number interval;
sequence No Count (SNC): the number of service message sequence numbers;
timestamp offset N: the value range of N is 2 to SNC compared with the offset value of the first time stamp.
For another example, when the rule of the corresponding flow-id field service flow in the timerecord rule table is configured to record the continuous M service message time stamps, the FTRT value may be defined as 2, and the format definition of the variable part of the passive delay measurement OAM message is shown in fig. 11 (c), and the meaning of each field is as follows:
sequence No Count (SNC): the number of service message time stamps carried by the OAM message;
sequence N: the sequence number of the Nth service message, wherein the value range of N is 1-SNC;
timestamp N: and the time stamp of the Nth service message, wherein the value range of N is 1-SNC.
It should be noted that the two passive delay measurement OAM message formats are only schematic, and the sequence and length of each field are not limited in this embodiment.
When a service source node (OAM Query node) performs performance measurement on a certain flow-id service, firstly, a timeRecordRule table is queried, a corresponding OAM message encapsulation format is selected according to a configured rule, and the Operation Administration and Maintenance (OAM) message encapsulation format is indicated by an FTRT field. Before sending an OAM message, a source node (Query node) inquires a service message timestamp recorded in a timeRecordTable, and constructs the OAM message (Query message) according to a format corresponding to an FTRT field.
When receiving passive delay measurement OAM, a service sink node (OAM response node) firstly identifies the carrying mode of a sending time stamp according to the FTRT field, sequentially extracts the sequence number and the sending time stamp of the service message from the OAM message according to the indication of the FTRT field, then queries the timeRecordTable locally by flow-id and the sequence number to obtain the receiving time stamp of the service message, and finally calculates the actual one-way delay of the service message according to the sending time stamp and the receiving time stamp of the service message.
Example two
In this embodiment, it is assumed that there is a DetNet MPLS traffic flow to be detected, whose flow-ids are respectively 1, called flow1, and time synchronization between source and destination nodes. The flow1 configures recording rules of service message time stamps in a timeRecordRule table of a source node and a destination node, and the rule of the flow1 configuration is that the service message time stamps are recorded by 2 messages at intervals from a sequence number 1. The Flow1 service Flow finishes sending a plurality of service messages, and a sending timestamp (tx timestamp) and a receiving timestamp (rx timestamp) of the message belonging to the Flow1 are respectively recorded in a timeRecordTable of the source and the destination nodes, and the Flow-id and the seq-no are used as indexes, as shown in fig. 12.
In order to perform accurate one-way delay measurement on the flow1 service flow, the source node selects a passive delay measurement method, and the Channel Type value is 0x88. For flow1, find the timeRecordTable, because the configuration rule is that 2 messages record service message time stamps at intervals, so the FTRT field is valued to be 1, the single OAM message carries 10 service message sending time stamp information, the initial service message serial number is 1, the corresponding time stamp in the timeRecordTable is 111000000, the 2 nd service message serial number is 3, the corresponding time stamp in the timeRecordTable is 113000000, so the offset2 is 2000000, the time stamp offset value calculation and encapsulation method of the 3 rd to 10 th service messages is the same as that of the 2 nd message, and the OAM message content is shown in fig. 13.
The method comprises the steps that a sink node receives an OAM message, firstly, the OAM message carrying passive time delay measurement is identified according to the value of ChannelType being 0x88, and then, the encapsulation format of the message is identified according to an encapsulated FTRT field. For flow1, the FTRT field is 1, and the OAM message format can be correctly identified by the OAM entity of the host node.
According to the message format indicated by FTRT, for flow1, the number of transmission time stamps of the carried service messages is 10, the initial sequence number is 1, the sequence number offset value is 2, the transmission time stamp is 111000000, the timeRecordTable is searched for by using flow-id=1 and sequence number 1, the receiving time stamp is 111000035, so that the 1 st service message Wen Shanxiang delay is calculated to be 35, then for flow1, the service message time stamp offset value of sequence number 3 is 2000000, the transmission time stamp is calculated to be 113000000, then the timeRecordTable is searched for by using flow-id=1 and seq-no=3, the receiving time stamp is 113000029, so that the unidirectional time delay of the sequence number 3 message is calculated to be 29, and the transmission, receiving time stamp extraction and unidirectional time delay calculation modes of the rest 8 messages are the same as those of the sequence number 3 message, and are not repeated.
Example III
In this embodiment, it is assumed that there is a DetNet MPLS traffic flow to be detected, whose flow-id is 2, called flow2, and time synchronization between source and destination nodes. The flow2 configures recording rules of the service message time stamp in the timeRecordRule table of the source and destination nodes, and the rule configured by the flow2 is to record the service message time stamp randomly. The two service flows finish sending a plurality of service messages, the sending and receiving time stamps of the messages to which the two services belong are respectively recorded in a timeRecordTable of the source and destination nodes, and flow-id and seq-no are used as indexes, as shown in fig. 14.
In order to perform accurate unidirectional delay measurement on the flow2 service flow, the source node selects a passive delay measurement method, and the value of ChannelType is 0x88. For flow2, a timeRecordRule table is searched, because the configuration rule is to randomly record a message timestamp, the FTRT field is valued to be 2, the single OAM message is planned to sequentially carry the sending timestamp information of 5 service messages, the 1 st service message sequence number is 2, the timestamp is 360000012, the second service message sequence number is 6, the timestamp is 420001023, the 5 th service message sequence number is 17, the timestamp is 276555123, and the OAM message content is shown in fig. 15.
The method comprises the steps that a sink node receives an OAM message, firstly, the OAM message carrying passive time delay measurement is identified according to the value of ChannelType being 0x88, and then, the encapsulation format of the message is identified according to an encapsulated FTRT field. For flow2, the FTRT field is 2, and the OAM message format can be correctly identified by the OAM entity of the host node.
According to the message format indicated by the FTRT field, for flow2, the number of transmission time stamps of the carried service messages is 5, for the 1 st service message, the sequence number is 2, the transmission time stamp is 360000012, the timeRecordTable is searched by flow-id=2 and seq-no=2, the receiving time stamp is 360000036, so that the time delay of the 1 st service message Wen Shanxiang is calculated to be 24, and the time stamp extraction and one-way time delay calculation methods of the 2 nd to 5 th messages are the same as those of the first message and are not repeated.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, functional modules/units in the apparatus, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between the functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed cooperatively by several physical components. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
Example embodiments have been disclosed herein, and although specific terms are employed, they are used and should be interpreted in a generic and descriptive sense only and not for purpose of limitation. In some instances, it will be apparent to one skilled in the art that features, characteristics, and/or elements described in connection with a particular embodiment may be used alone or in combination with other embodiments unless explicitly stated otherwise. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the disclosure as set forth in the appended claims.
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| PCT/CN2023/089159 WO2024055584A1 (en) | 2022-09-14 | 2023-04-19 | Delay measurement method, electronic device, and computer-readable medium |
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| CN102201983A (en) * | 2011-05-03 | 2011-09-28 | 中兴通讯股份有限公司 | Method, terminal and system for measuring asymmetric time delay of transmission link |
| RO131470A2 (en) * | 2015-04-10 | 2016-10-28 | Ixia, A California Corporation | Methods, systems and computer-readable media for one-way link delay measurement |
| CN113644998B (en) * | 2021-08-23 | 2023-06-09 | 烽火通信科技股份有限公司 | IOAM time delay measuring method and device for 5G network |
| CN113992297B (en) * | 2021-12-06 | 2022-05-03 | 网络通信与安全紫金山实验室 | Method, device, electronic device and storage medium for determining network delay |
| CN115002008B (en) * | 2022-08-05 | 2022-11-04 | 北京云脉芯联科技有限公司 | Method, device, equipment and storage medium for measuring network delay |
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