CN114499735B - Service transmission method, system and computer readable storage medium - Google Patents

Service transmission method, system and computer readable storage medium Download PDF

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Publication number
CN114499735B
CN114499735B CN202011263522.2A CN202011263522A CN114499735B CN 114499735 B CN114499735 B CN 114499735B CN 202011263522 A CN202011263522 A CN 202011263522A CN 114499735 B CN114499735 B CN 114499735B
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time window
bandwidth
speed limit
detection time
service
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CN114499735A (en
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胡骞
霍晓莉
荆瑞泉
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China Telecom Corp Ltd
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China Telecom Corp Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1605—Fixed allocated frame structures
    • H04J3/1652—Optical Transport Network [OTN]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0086—Network resource allocation, dimensioning or optimisation

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The present disclosure provides a service transmission method and a service transmission network management system for a service transmission line. The service transmission line comprises CPE equipment and local side OTN equipment in communication connection with the CPE equipment. The service transmission method comprises the following steps: setting a first speed limit point at a user network side interface of CPE equipment, so that service traffic is transmitted at the user network side interface with a first speed limit bandwidth, wherein the first speed limit bandwidth is CIR; setting a second speed limiting point at the local side OTN equipment, so that the service flow is transmitted at the local side OTN equipment by using a second speed limiting bandwidth, wherein the initial value of the second speed limiting bandwidth is CIR multiplied by alpha, and alpha is the ratio of the number of bytes of the service flow after bytes are added by the CPE equipment to the number of bytes before bytes are added; counting the total byte number of the service flow received by the local side OTN equipment and the number of the received data packets in a detection time window, and calculating the average length of the data packets according to the total byte number and the number of the data packets; and adjusting the second speed-limiting bandwidth according to the average length of the data packets.

Description

Service transmission method, system and computer readable storage medium
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a service transmission method for a service transmission line, a service transmission network management system, and a computer readable storage medium.
Background
The ethernet ports typically only need to be limited to CPE (Customer Premise Equipment ) access devices (e.g., switches, routers, etc.), but in OTN (Optical Transport Network ) networks, ethernet packet processing is often done in multiple OTN devices for small-particle ethernet traffic (e.g., no more than 1000M).
Currently, port speed limiting is mainly achieved through optimization of a token bucket algorithm or adjustment of parameters. However, in OTN networks, since ODU (Optical Data Unit ) is a rigid pipe, it makes no sense to set different CIR (Committed Information Rate ) and PIR (Peak Information Rate, highest information rate) for ethernet traffic, and it generally takes cir=pir, which results in a finer speed-limiting pattern that cannot be achieved by token bucket algorithm.
Disclosure of Invention
The inventor of the present disclosure finds that the byte expansion caused by adding SVLAN or the like to a message by a device in a known service transmission line may cause inaccurate speed limit, and may easily cause resource waste or packet loss.
In view of this, the inventors of the present disclosure propose a service transmission method for a service transmission line, thereby enabling the service transmission line to be more accurately speed-limited.
According to an aspect of the present disclosure, there is provided a service transmission method for a service transmission line, wherein the service transmission line includes customer premise equipment CPE equipment and a local optical transport network OTN equipment communicatively connected to the CPE equipment, the service transmission method including: setting a first speed limit point at a user network side interface of the CPE equipment, so that service traffic is transmitted at the user network side interface with a first speed limit bandwidth, wherein the first speed limit bandwidth is a committed information rate CIR; setting a second speed limit point at the local side OTN equipment, so that the service flow is transmitted at the local side OTN equipment by using a second speed limit bandwidth, wherein the initial value of the second speed limit bandwidth is CIR multiplied by alpha, and alpha is the ratio of the byte number of the service flow after bytes are added by the CPE equipment to the byte number before bytes are added; counting the total byte number of the service flow received by the local side OTN equipment and the number of received data packets in a detection time window, and calculating the average length of the data packets according to the total byte number and the number of the data packets; and adjusting the second speed limiting bandwidth according to the average length of the data packet.
In some embodiments, the detection time window is set to a range T 0 To T max Wherein T is 0 For the initial value of the detection time window, T max Is the maximum value of the detection time window; the service transmission method further comprises the following steps: taking delta T as step time, and taking the detection time window from the T 0 Gradually increase to said T max Wherein DeltaT>0。
In some embodiments, the service transmission method further includes: judging the last detection time window T n-1 Whether packet loss occurs or not, wherein n is a positive integer greater than or equal to 1; if in the last detection time window T n-1 If no packet loss occurs in the window, the current detection time window T n Adjusted to T n ＝min(T n-1 +ΔT,T max )，Wherein T is n ≤T max The method comprises the steps of carrying out a first treatment on the surface of the If in the last detection time window T n-1 When packet loss occurs in the detection window, the current detection window T is detected n Adjusted to T n ＝β×T n-1 Wherein, 0 < beta < 1.
In some embodiments, the average length L of the data packets is calculated pkt The relation of (2) is:wherein R is byte R is the total number of bytes of the received traffic flow num For the number of received data packets; according to the average length L of the data packet pkt Adjusting the second speed limit bandwidth B 2 Is->Wherein B is 1 For the first speed-limiting bandwidth, γ is the number of bytes that the traffic increases after passing through the CPE device.
In some embodiments, the α ranges from 1 < α.ltoreq.1.06; the gamma is 4.
According to another aspect of the present disclosure, there is provided a service transmission network management system for a service transmission line, wherein the service transmission line includes customer premise equipment CPE equipment and a local optical transport network OTN equipment communicatively connected to the CPE equipment, the service transmission network management system comprising: a first speed limit point setting unit, configured to set a first speed limit point at a user network side interface of the CPE device, so that a traffic is transmitted at the user network side interface with a first speed limit bandwidth, where the first speed limit bandwidth is a committed information rate CIR; a second speed limit point setting unit, configured to set a second speed limit point at the local side OTN device, so that the service traffic is transmitted at the local side OTN device with a second speed limit bandwidth, where an initial value of the second speed limit bandwidth is cirxα, where α is a ratio of a number of bytes of the service traffic after bytes are added by the CPE device to a number of bytes before bytes are added; the statistics unit is used for counting the total byte number of the service flow received by the local side OTN equipment and the number of the received data packets in a detection time window, and calculating the average length of the data packets according to the total byte number and the number of the data packets; and the bandwidth adjusting unit is used for adjusting the second speed limiting bandwidth of the second speed limiting point according to the average length of the data packet.
In some embodiments, the detection time window is set to a range T 0 To T max Wherein T is 0 For the initial value of the detection time window, T max Is the maximum value of the detection time window; the service transmission network management system further comprises: a time window adjusting unit for taking DeltaT as step time to adjust the detection time window from T 0 Gradually increase to said T max Wherein DeltaT>0。
In some embodiments, the time window adjusting unit is configured to determine a last detection time window T n-1 Whether packet loss occurs or not, wherein n is a positive integer greater than or equal to 1, if at the last detection time window T n-1 If no packet loss occurs in the window, the current detection time window T n Adjusted to T n ＝min(T n-1 +ΔT,T max ) Wherein T is n ≤T max If in the last detection time window T n-1 When packet loss occurs in the detection window, the current detection window T is detected n Adjusted to T n ＝β×T n-1 Wherein, 0 < beta < 1.
In some embodiments, the statistics unit calculates an average length L of the data packets pkt The relation of (2) is:wherein R is byte R is the total number of bytes of the received traffic flow num For the number of received data packets; and the bandwidth adjusting unit adjusts the bandwidth according to the average length L of the data packet pkt Adjusting the second speed limit bandwidth B 2 Is->Wherein B is 1 For the first limitAnd the fast bandwidth, gamma is the byte number of the service flow which is increased after passing through the CPE equipment.
In some embodiments, the α ranges from 1 < α.ltoreq.1.06; the gamma is 4.
According to another aspect of the present disclosure, there is provided a service transmission network management system for a service transmission line, including: a memory; and a processor coupled to the memory, the processor configured to perform the method as described above based on instructions stored in the memory.
According to another aspect of the present disclosure, there is provided a computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement a method as previously described.
In the service transmission method, a first speed limit point is set at a user network side interface of CPE equipment, so that service traffic is transmitted at the user network side interface with a first speed limit bandwidth, wherein the first speed limit bandwidth is CIR; setting a second speed limit point at the local side OTN equipment, so that the service flow is transmitted at the local side OTN equipment by using a second speed limit bandwidth, wherein the initial value of the second speed limit bandwidth is CIR multiplied by alpha, and alpha is the ratio of the number of bytes of the service flow after bytes are added by the CPE equipment to the number of bytes before bytes are added; counting the total byte number of the service flow received by the local side OTN equipment and the number of the received data packets in a detection time window, and calculating the average length of the data packets according to the total byte number and the number of the data packets; and adjusting the second speed-limiting bandwidth according to the average length of the data packets. Thus, the speed limit bandwidth of the second speed limit point may be dynamically changed. The method can enable the service transmission line (such as an OTN private line network) to more accurately limit the speed according to the bandwidth requirement of a user, saves ODU resources of local side OTN equipment, reduces the service cost of the line, and can also prevent the occurrence of packet loss as far as possible.
Other features of the present disclosure and its advantages will become apparent from the following detailed description of exemplary embodiments of the disclosure, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.
The disclosure may be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings in which:
fig. 1 is a flow chart illustrating a traffic transmission method for a traffic transmission line according to some embodiments of the present disclosure;
fig. 2 is a schematic diagram illustrating a structure of a service transmission line according to some embodiments of the present disclosure;
fig. 3 is a schematic diagram illustrating a structure of a service transmission network management system for a service transmission line according to some embodiments of the present disclosure;
fig. 4 is a schematic diagram illustrating a structure of a service transmission network management system for a service transmission line according to other embodiments of the present disclosure;
fig. 5 is a schematic diagram illustrating a structure of a service transmission network management system for a service transmission line according to other embodiments of the present disclosure.
Detailed Description
Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless it is specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
The inventor of the disclosure found that, due to the rigid pipeline characteristic of the ODU, although different ethernet services may share the ODU0 channel, the occupied bandwidth of the ethernet service may be fixed when a single station is configured, if only the CPE device is limited, the service rate of the outlet is increased due to the addition of the SVLAN (Service Virtual Local Area Network) to the CPE device, and the local side OTN device connected to the CPE device may be required to configure a larger bandwidth to ensure that no packet is lost, and this value is too high, which may generate resource waste, resulting in higher OTN dedicated line service cost; however, if the same speed limit is adopted for the local side OTN equipment, the speed limit is inaccurate due to the addition of the SVLAN to the CPE equipment. Therefore, the speed limit of the service transmission line known by the inventor of the present disclosure may be inaccurate due to byte expansion caused by adding SVLAN or the like to the message by the device, which may easily cause resource waste or packet loss.
In view of this, the inventors of the present disclosure propose a service transmission method for a service transmission line, thereby enabling the service transmission line to be more accurately speed-limited.
Fig. 1 is a flowchart illustrating a traffic transmission method for a traffic transmission line according to some embodiments of the present disclosure. As shown in fig. 1, the method includes steps S102 to S108. Fig. 2 is a schematic diagram illustrating a structure of a service transmission line according to some embodiments of the present disclosure. As shown in fig. 2, the service transmission line includes a CPE device 210 and a local OTN device 220 communicatively connected to the CPE device 210. For example, the CPE device 210 and the local side OTN device 220 may each implement an ETH (Ethernet) connection. In addition, a metropolitan or backbone OTN 230 is also shown in fig. 2.
A service transmission method for a service transmission line according to some embodiments of the present disclosure is described in detail below with reference to fig. 1 and 2.
As shown in fig. 1 and 2, at step S102, a first speed limit point is set at the user network side interface 211 of the CPE device 210, so that traffic is transmitted at the user network side interface 211 with a first speed limit bandwidth. The first rate-limiting bandwidth is CIR. Here, the CIR is the service committed bandwidth.
As shown in fig. 1 and fig. 2, in step S104, a second speed limit point is set at the local side OTN device 220, so that the traffic is transmitted at the local side OTN device 220 with a second speed limit bandwidth. The initial value of the second speed-limiting bandwidth is cirx alpha, wherein alpha is the ratio of the number of bytes of the traffic flow after bytes are added by the CPE device to the number of bytes before bytes are added. In some embodiments, α ranges from 1 < α.ltoreq.1.06. For example, α=1.06.
For example, the SVLAN message length is calculated as follows:
according to the 802.3 protocol, the original ethernet message is 64 bytes to 1518 bytes in length.
According to the 802.1q protocol, a layer of VLAN (e.g., CVLAN (customer virtual lan), 4 bytes) is added and the message length is 68 bytes to 1522 bytes.
According to the 802.1ad protocol, a 4 byte SVLAN is allowed to continue to be added at the CVLAN outer layer in a QinQ fashion.
For example, a message entering CPE device 210 has added a CVLAN, with a message length ranging from 68 bytes to 1522 bytes. While at the NNI (Network to Network Interface, network node interface) 212 of the CPE device, an SVLAN (fixed 4 bytes) is added to each packet. Thus, adding the SVLAN again via the CPE device results in a message length increase of at most 4/68≡5.89%, at least 4/1522≡0.26%. The α is the ratio of the number of bytes of the traffic flow after the bytes are added by the CPE device to the number of bytes before the bytes are added.
The present disclosure is not limited to message lengths, i.e., the method of the present disclosure is applicable to ethernet messages of any message length range, considering that some devices or meters allow a minimum message to remain 64 bytes after adding a CVLAN, and considering the differences in message length definitions by different standards. In the above embodiment, 6% is taken as the maximum influence value. Therefore, the value range of alpha can be 1 < alpha less than or equal to 1.06.
As shown in fig. 1 and fig. 2, in step S106, the total number of bytes and the number of received data packets of the service traffic received by the local OTN device 220 are counted in the detection time window, and the average length of the data packets is calculated according to the total number of bytes and the number of data packets.
For example, calculate the average length L of the data packet pkt The relation of (2) is:
wherein R is byte R is the total number of bytes of the received traffic flow num Is the number of packets received.
As shown in fig. 1 and 2, in step S108, the second speed-limiting bandwidth is adjusted according to the average length of the data packet.
In some embodiments, the average length L of the data packets is based on pkt Adjusting the second speed-limiting bandwidth B 2 Is that
Wherein B is 1 For the first rate-limiting bandwidth, γ is the number of bytes that traffic increases after passing through the CPE device. For example, γ is 4. Here, 4 bytes are the number of bytes in which the message passes through the CPE device adding the SVLAN.
To this end, there is provided a service transmission method for a service transmission line according to some embodiments of the present disclosure. The service transmission line comprises CPE equipment and local side OTN equipment in communication connection with the CPE equipment. The service transmission method comprises the following steps: setting a first speed limit point at a user network side interface of CPE equipment, so that service traffic is transmitted at the user network side interface with a first speed limit bandwidth, wherein the first speed limit bandwidth is CIR; setting a second speed limit point at the local side OTN equipment, so that the service flow is transmitted at the local side OTN equipment by using a second speed limit bandwidth, wherein the initial value of the second speed limit bandwidth is CIR multiplied by alpha, and alpha is the ratio of the number of bytes of the service flow after bytes are added by the CPE equipment to the number of bytes before bytes are added; counting the total byte number of the service flow received by the local side OTN equipment and the number of the received data packets in a detection time window, and calculating the average length of the data packets according to the total byte number and the number of the data packets; and adjusting the second speed-limiting bandwidth according to the average length of the data packets. Thus, the speed limit bandwidth of the second speed limit point may be dynamically changed. The method can enable the service transmission line (such as an OTN private line network) to more accurately limit the speed according to the bandwidth requirement of a user, saves ODU resources of local side OTN equipment, reduces the service cost of the line, and can also prevent the occurrence of packet loss as far as possible.
In some embodiments, the detection time window is set to a range T 0 To T max Wherein T is 0 To detect the initial value of the time window, T max For detecting the maximum value of the time window. The service transmission method may further include: taking DeltaT as step time, and taking the detection time window from T 0 Gradually increase to T max Wherein DeltaT>0. That is, the detection time window is gradually increased by DeltaT, thereby being increased from T 0 Gradually increase to T max . This enables a dynamic adjustment of the detection time window.
In some embodiments, the service transmission method may further include: judging the last detection time window T n-1 Whether packet loss occurs or not, wherein n is a positive integer greater than or equal to 1.
The service transmission method further comprises the following steps: if the last detection time window T n-1 If no packet loss occurs in the window, the current detection time window T n Is adjusted to
T n ＝min(T n-1 +ΔT,T max ) Wherein T is n ≤T max . Here min (T) n-1 +ΔT,T max ) The representation taking T n-1 +DeltaT and T max The smaller of the two. So that the detection time window is gradually increased and converged to a larger value T when no packet is lost max Thereby avoiding frequent adjustment of the bandwidth as much as possible.
The service transmission method further comprises the following steps: if the last detection time window T n-1 Packet loss will occur in the systemCurrent detection time window T n Adjusted to T n ＝β×T n-1 Wherein, 0 < beta < 1. For example, β=0.5. Therefore, when packet loss occurs, the detection time window can be reduced rapidly, and a new second speed limit bandwidth is calculated and issued in a mode of reckoning the average packet length as soon as possible, so that the speed limit is regulated to be reasonable as soon as possible.
In the above embodiment, the second speed limit point performs dynamic speed limit with the detection time window T as a period, and the detection time window T adopts a determination rule of additive increase and multiplicative decrease (Additive Increase Multiplicative Decrease, abbreviated as AIMD). By setting the detection time window T according to the determination rule, the detection time window can be ensured to be gradually increased and converged to a larger value T when no packet is lost max The bandwidth is prevented from being frequently adjusted as much as possible, and the detection time window is reduced as soon as possible when the packet is lost, and the new second speed limit bandwidth is calculated and issued in a mode of reckoning the average packet length as soon as possible, so that the speed limit is adjusted to be reasonable as soon as possible.
In the service transmission method, two speed limiting points are set to limit the speed of CPE equipment and local side OTN equipment respectively. The first speed limiting point limits the speed according to the service promised bandwidth, the second speed limiting point considers that the CPE equipment adds SVLAN for example to increase the message length, the increasing amplitude is related to the message length, the initial speed limiting value is calculated according to the shortest message length of the service flow, the total received bytes and the received data packet number are counted in the detection time window, the average packet length is calculated, and the dynamic speed limiting is carried out according to the average packet length. The detection time window of the second speed limit point allows dynamic adjustment, so that the bandwidth is prevented from being frequently adjusted when no packet is lost, and the speed limit is converged to a reasonable speed limit as soon as possible when the packet is lost.
For example, assuming that the service bandwidth requirement of the user is 100M, the message length ranges from 64 bytes to 1518 bytes, when entering the special line CPE device, the data packet carries the CVLAN, and the SVLAN identifier needs to be added in the OTN network, the first speed limit point may limit the speed by 100M, the second speed limit point may initially limit the speed by 100M by 6%, and then at T 0 The average packet length is counted internally, and the second speed limit point is adjusted in the next time window according to the calculation principleAnd the value of the time window T may also be adjusted according to the method described above.
Fig. 3 is a schematic diagram illustrating a structure of a service transmission network management system for a service transmission line according to some embodiments of the present disclosure. As shown in fig. 3, the service transmission line includes a CPE device 210 and a local side OTN device 220 communicatively connected to the CPE device 210.
As shown in fig. 3, the service transmission network management system 300 includes: a first speed limit point setting unit 302, a second speed limit point setting unit 304, a statistics unit 306, and a bandwidth adjustment unit 308.
The first speed limit point setting unit 302 is configured to set a first speed limit point at a user network side interface of the CPE device 210, so that the traffic is transmitted at the user network side interface with a first speed limit bandwidth. The first rate-limiting bandwidth is CIR.
The second speed limit point setting unit 304 is configured to set a second speed limit point at the local side OTN device 220, so that the traffic is transmitted at the local side OTN device 220 with a second speed limit bandwidth. The initial value of the second speed-limiting bandwidth is cirxα, where α is the ratio of the number of bytes of the traffic after bytes are added to the traffic through the CPE device 210 to the number of bytes before bytes are added. For example, the range of α is 1 < α.ltoreq.1.06.
The statistics unit 306 is configured to count the total number of bytes of the service traffic received by the local OTN device 220 and the number of received data packets within a detection time window, and calculate an average length of the data packets according to the total number of bytes and the number of data packets.
For example, the statistics unit 306 calculates the average length L of the data packets pkt The relation of (2) is:
wherein R is byte R is the total number of bytes of the received traffic flow num Is the number of packets received.
The bandwidth adjusting unit 308 is configured to adjust the second speed-limiting bandwidth of the second speed-limiting point according to the average length of the data packet.
For example, bandwidth adjusting unit 308 adjusts the bandwidth according to the packetAverage length L pkt Adjusting the second speed-limiting bandwidth B 2 Is thatWherein B is 1 For the first rate-limiting bandwidth, γ is the number of bytes that traffic increases after passing through the CPE device. For example, γ is 4.
Thus far, a service transmission network management system for a service transmission line according to some embodiments of the present disclosure is provided. In the service transmission network management system, a first speed limit point setting unit sets a first speed limit point at a user network side interface of CPE equipment, so that service traffic is transmitted at the user network side interface with a first speed limit bandwidth, wherein the first speed limit bandwidth is a committed information rate CIR; the second speed limit point setting unit sets a second speed limit point at the local side OTN equipment, so that the service flow is transmitted by the local side OTN equipment in a second speed limit bandwidth, and the initial value of the second speed limit bandwidth is CIR multiplied by alpha; the statistics unit counts the total byte number of the service flow received by the local side OTN equipment and the number of the received data packets in a detection time window, and calculates the average length of the data packets according to the total byte number and the number of the data packets; and the bandwidth adjusting unit adjusts the second speed limiting bandwidth of the second speed limiting point according to the average length of the data packet. The system can enable the service transmission line (such as an OTN private line network) to more accurately limit the speed according to the bandwidth requirement of a user, saves ODU resources of local side OTN equipment, reduces the service cost of the line, and can also prevent the occurrence of packet loss as far as possible.
In some embodiments, the detection time window is set to a range T 0 To T max Wherein T is 0 To detect the initial value of the time window, T max For detecting the maximum value of the time window.
In some embodiments, as shown in fig. 3, the service transmission network management system 300 may further include a time window adjustment unit 310. The time window adjusting unit 310 is configured to take Δt as the step time, and to determine the detection time window from T 0 Gradually increase to T max Wherein DeltaT>0。
In some embodiments, the time window is modulatedThe whole unit 310 is used for determining T in the last detection time window n-1 Whether packet loss occurs, wherein n is a positive integer greater than or equal to 1, if the last detection time window T n-1 If no packet loss occurs in the window, the current detection time window T n Adjusted to T n ＝min(T n-1 +ΔT,T max ) Wherein T is n ≤T max If the last detection time window T n-1 When packet loss occurs in the detection window, the current detection window T is detected n Adjusted to T n ＝β×T n-1 Wherein, 0 < beta < 1.
In the embodiment of the disclosure, on the premise of not changing software and hardware of the OTN device, the upper network manager can collect the existing performance parameters (for example, the number of messages, the number of bytes, etc.), calculate the reasonable bandwidth rate, limit the speed of the second speed limiting point, realize the fine control of the speed limiting function, and improve the bandwidth utilization rate. The method and the system can be applied to all OTN equipment supporting port speed limit, and can support without changing software and hardware of the OTN equipment.
In the method and the network management system of the embodiment of the disclosure, the local side OTN device can bear the function of converging small-particle Ethernet private line services, and the method and the network management system can save ODU resources and reduce private line cost on the premise of ensuring customer service for fine speed-limiting management of each service.
In the method and the network management system, the first speed limiting point ensures accurate speed limiting according to the service bandwidth; and the second speed limiting point dynamically detects the message length, so that the service flow added with the SVLAN occupies the least resources on the premise of not losing packets within the promised rate.
Fig. 4 is a schematic diagram illustrating a structure of a service transmission network management system for a service transmission line according to other embodiments of the present disclosure. The traffic transmission network management system includes a memory 410 and a processor 420. Wherein:
memory 410 may be a magnetic disk, flash memory, or any other non-volatile storage medium. The memory is used for storing instructions in the corresponding embodiment of fig. 1.
Processor 420, coupled to memory 410, may be implemented as one or more integrated circuits, such as a microprocessor or microcontroller. The processor 420 is configured to execute the instruction stored in the memory, so that the service transmission line can more accurately limit the speed according to the bandwidth requirement of the user, and the ODU resource of the local side OTN device is saved, thereby reducing the service cost of the line.
In some embodiments, as also shown in fig. 5, the traffic transmission network management system 500 includes a memory 510 and a processor 520. Processor 520 is coupled to memory 510 by BUS 530. The service delivery network management system 500 may also be connected to external storage 550 via a storage interface 540 for invoking external data, and may also be connected to a network or another computer system (not shown) via a network interface 560, which will not be described in detail herein.
In this embodiment, the data instruction is stored in the memory, and then the processor processes the instruction, so that the service transmission line can more accurately limit the speed according to the bandwidth requirement of the user, and the ODU resource of the local side OTN device is saved, thereby reducing the service cost of the line.
In other embodiments, the present disclosure also provides a computer-readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the steps of the method of the corresponding embodiment of fig. 1. It will be apparent to those skilled in the art that embodiments of the present disclosure may be provided as a method, apparatus, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Thus far, the present disclosure has been described in detail. In order to avoid obscuring the concepts of the present disclosure, some details known in the art are not described. How to implement the solutions disclosed herein will be fully apparent to those skilled in the art from the above description.
Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the disclosure. The scope of the present disclosure is defined by the appended claims.

Claims (12)

1. A service transmission method for a service transmission line, wherein the service transmission line includes customer premise equipment CPE equipment and an office optical transport network OTN equipment communicatively connected to the CPE equipment, the service transmission method comprising:
setting a first speed limit point at a user network side interface of the CPE equipment, so that service traffic is transmitted at the user network side interface with a first speed limit bandwidth, wherein the first speed limit bandwidth is a committed information rate CIR;
setting a second speed limit point at the local side OTN equipment, so that the service flow is transmitted at the local side OTN equipment by using a second speed limit bandwidth, wherein the initial value of the second speed limit bandwidth is CIR multiplied by alpha, and alpha is the ratio of the byte number of the service flow after bytes are added by the CPE equipment to the byte number before bytes are added;
counting the total byte number of the service flow received by the local side OTN equipment and the number of received data packets in a detection time window, and calculating the average length of the data packets according to the total byte number and the number of the data packets; and
and adjusting the second speed limiting bandwidth according to the average length of the data packet.
2. The traffic transmission method according to claim 1, wherein,
the setting range of the detection time window is T 0 To T max Wherein T is 0 For the initial value of the detection time window, T max Is the maximum value of the detection time window;
the service transmission method further comprises the following steps:
taking delta T as step time, and taking the detection time window from the T 0 Gradually increase to said T max Wherein DeltaT>0。
3. The traffic transmission method according to claim 2, further comprising:
judging the last detection time window T n-1 Whether packet loss occurs or not, wherein n is a positive integer greater than or equal to 1;
if in the last detection time window T n-1 If no packet loss occurs in the window, the current detection time window T n Adjusted to T n ＝min(T n-1 +ΔT,T max ) Wherein T is n ≤T max ；
If in the last detection time window T n-1 When packet loss occurs in the detection window, the current detection window T is detected n Adjusted to T n ＝β×T n-1 Wherein, 0 < beta < 1.
4. The traffic transmission method according to claim 1, wherein,
calculating the average length L of the data packet pkt The relation of (2) is:
wherein R is byte R is the total number of bytes of the received traffic flow num For the number of received data packets;
according to the average length L of the data packet pkt Adjusting the second speed limit bandwidth B 2 Is that
Wherein B is 1 For the first speed-limiting bandwidth, γ is the number of bytes that the traffic increases after passing through the CPE device.
5. The traffic transmission method according to claim 4, wherein,
alpha is more than 1 and less than or equal to 1.06;
the gamma is 4.
6. A service transmission network management system for a service transmission line, wherein the service transmission line includes customer premise equipment CPE equipment and an office optical transport network OTN equipment in communication connection with the CPE equipment, the service transmission network management system comprising:
a first speed limit point setting unit, configured to set a first speed limit point at a user network side interface of the CPE device, so that a traffic is transmitted at the user network side interface with a first speed limit bandwidth, where the first speed limit bandwidth is a committed information rate CIR;
a second speed limit point setting unit, configured to set a second speed limit point at the local side OTN device, so that the service traffic is transmitted at the local side OTN device with a second speed limit bandwidth, where an initial value of the second speed limit bandwidth is cirxα, where α is a ratio of a number of bytes of the service traffic after bytes are added by the CPE device to a number of bytes before bytes are added;
the statistics unit is used for counting the total byte number of the service flow received by the local side OTN equipment and the number of the received data packets in a detection time window, and calculating the average length of the data packets according to the total byte number and the number of the data packets; and
and the bandwidth adjusting unit is used for adjusting the second speed limiting bandwidth of the second speed limiting point according to the average length of the data packet.
7. The traffic transmission network management system according to claim 6, wherein,
the setting range of the detection time window is T 0 To T max Wherein T is 0 For the initial value of the detection time window, T max Is the maximum value of the detection time window;
the service transmission network management system further comprises:
a time window adjusting unit for taking DeltaT as step time to adjust the detection time window from T 0 Gradually increase to said T max Wherein DeltaT>0。
8. The traffic transmission network management system according to claim 7, wherein,
the time window adjusting unit is used for judging the last detection time window T n-1 Whether packet loss occurs in the packet, wherein n is a positive integer greater than or equal to 1If in the last detection time window T n-1 If no packet loss occurs in the window, the current detection time window T n Adjusted to T n ＝min(T n-1 +ΔT,T max ) Wherein T is n ≤T max If in the last detection time window T n-1 When packet loss occurs in the detection window, the current detection window T is detected n Adjusted to T n ＝β×T n-1 Wherein, 0 < beta < 1.
9. The traffic transmission network management system according to claim 6, wherein,
the statistics unit calculates an average length L of the data packets pkt The relation of (2) is:
wherein R is byte R is the total number of bytes of the received traffic flow num For the number of received data packets; and
the bandwidth adjusting unit adjusts the bandwidth according to the average length L of the data packet pkt Adjusting the second speed limit bandwidth B 2 Is thatWherein B is 1 For the first speed-limiting bandwidth, γ is the number of bytes that the traffic increases after passing through the CPE device.
10. The traffic transmission network management system according to claim 9, wherein,
alpha is more than 1 and less than or equal to 1.06;
the gamma is 4.
11. A service transmission network management system for a service transmission line, comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the method of any of claims 1-5 based on instructions stored in the memory.
12. A computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the method of any of claims 1 to 5.
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