CN109039728B - BFD-based flow congestion detection method and system - Google Patents
BFD-based flow congestion detection method and system Download PDFInfo
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- CN109039728B CN109039728B CN201810820981.2A CN201810820981A CN109039728B CN 109039728 B CN109039728 B CN 109039728B CN 201810820981 A CN201810820981 A CN 201810820981A CN 109039728 B CN109039728 B CN 109039728B
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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
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
- H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0663—Performing the actions predefined by failover planning, e.g. switching to standby network elements
Abstract
The invention discloses a BFD-based flow congestion detection method and system, and relates to the field of flow congestion detection. The method comprises the following steps: setting a jitter threshold; calculating the jitter value of the BFD message according to the receiving interval of the BFD message; and comparing the jitter value of the BFD message with a jitter threshold value, and judging whether the BFD link has flow congestion or not. The invention detects the link congestion according to the jitter value of the BFD message, can quickly detect the flow congestion and avoid a large amount of packet loss.
Description
Technical Field
The invention relates to the field of flow congestion detection, in particular to a flow congestion detection method and system based on BFD.
Background
In order to protect key applications, a certain redundant backup link is generally designed in a network, and when a network fails, network equipment is required to be capable of quickly detecting the failure and switching traffic to the backup link so as to accelerate network convergence. Some links exist, for example: POS (PACKET OVER SONET/SDH, PACKET service OVER SONET/SDH, SONET is synchronous optical network, SDH is synchronous digital hierarchy, and PACKET is PACKET), and realizes rapid fault detection through a hardware detection mechanism. However, there are some links, such as: ethernet links, do not have such a detection mechanism. At this time, the application depends on the mechanism of the upper layer protocol itself to perform fault detection, and the detection time of the upper layer protocol is more than 1 second, and such fault detection time cannot be tolerated for some applications.
Some routing protocols, for example: although a Fast Hello (integrity rapid detection) function IS provided to accelerate the detection speed, the detection time can only reach the precision of 1 second, and the Fast Hello function IS only specific to the Protocol and cannot provide rapid fault detection for other protocols.
The development of networks is changing day by day, and with the continuous emergence of new applications on IP networks, new requirements are also put forward on the service quality of IP networks, and the best effort service of the conventional IP networks cannot identify and distinguish various communication classes in the networks, and the distinguishing capability of the communication classes is the premise of providing different services for different communications.
The BFD (Bidirectional Forwarding Detection) protocol is generated in this context, and provides a general standardized medium-independent and protocol-independent fast failure Detection mechanism, which can detect any medium and protocol, identify and distinguish various communication categories in the network, and has the following advantages:
(1) the method includes performing fault detection on any type of bidirectional forwarding Path between network devices, including a direct connection physical link, a virtual circuit, a tunnel, MPLS (Multi-Protocol Label Switching), LSP (Label Switched Path), a Multi-hop routing Path, a unidirectional link, and the like.
(2) Consistent and fast failure detection time can be provided for different upper-layer application services.
(3) The detection time less than 1 second is provided, so that the network convergence speed is accelerated, the application interruption time is reduced, and the reliability of the network is improved.
In a traditional IP network, all messages are treated identically without distinction, each forwarding device processes all messages by using a FIFO (First Input First Output) policy, and it makes the Best Effort (Best-Effort) to send the messages to the destination, but does not provide any guarantee for the reliability of message transmission, transmission delay, and other performances. When traffic congestion occurs, the best effort mode of the conventional network cannot meet the requirements of practical application, and a new traffic management method needs to be developed to ensure the quality of service.
The existing traffic congestion detection mechanism is as follows: after the traffic congestion occurs, a large amount of packet loss occurs, and the traffic congestion can be determined to occur, and the detection method has the defect of low detection speed.
Disclosure of Invention
The purpose of the present invention is to overcome the above drawbacks of the background art, and to provide a method and a system for detecting flow congestion based on BFD, which detect the occurrence of congestion in a link according to the jitter value of a BFD packet, and can quickly detect flow congestion and avoid the occurrence of a large amount of packet loss.
The invention provides a BFD-based flow congestion detection method, which comprises the following steps:
setting a jitter threshold;
calculating the jitter value of the BFD message according to the receiving interval of the BFD message;
comparing the jitter value of the BFD message with a jitter threshold value, and judging whether a BFD link has flow congestion or not;
the method comprises the following steps of calculating the jitter value of the BFD message according to the receiving interval of the BFD message, and the specific process is as follows:
counting the time interval of receiving two adjacent BFD messages, and recording as a time sequence Ti;
performing Discrete Fourier Transform (DFT) on Ti to obtain a frequency domain sequence Fi;
and taking the number N (Fi) of the frequency domain sequences Fi, wherein N (Fi) is the jitter value of the BFD message.
On the basis of the technical scheme, the method compares the jitter value of the BFD message with the jitter threshold value and judges whether the BFD link has flow congestion, and the specific process comprises the following steps:
and when the jitter value of the BFD message exceeds the jitter threshold value, determining that the BFD link has abnormity and BFD flow congestion occurs.
On the basis of the technical scheme, the method further comprises the following steps: and when the BFD link is detected to be abnormal, setting the BFD message to be in a DOWN state.
On the basis of the technical scheme, after the BFD message is set to be in a DOWN state, the method further comprises the following steps: and triggering protection switching, switching the flow to a standby path, and enabling the flow to be recovered to be normal.
The invention also provides a BFD-based flow congestion detection system, which comprises a setting unit, a calculating unit and a judging unit, wherein:
a setting unit configured to: setting a jitter threshold;
a computing unit to: calculating the jitter value of the BFD message according to the receiving interval of the BFD message;
a determination unit configured to: comparing the jitter value of the BFD message with a jitter threshold value, and judging whether a BFD link has flow congestion or not;
the specific process of calculating the jitter value of the BFD message by the calculating unit is as follows:
counting the time interval of receiving two adjacent BFD messages, and recording as a time sequence Ti;
performing Discrete Fourier Transform (DFT) on Ti to obtain a frequency domain sequence Fi;
and taking the number N (Fi) of the frequency domain sequences Fi, wherein N (Fi) is the jitter value of the BFD message.
On the basis of the above technical solution, the determining unit is specifically configured to: and when the jitter value of the BFD message exceeds the jitter threshold value, determining that the BFD link has abnormity and BFD flow congestion occurs.
On the basis of the technical scheme, the BFD-based flow congestion detection system further comprises a first processing unit, and when the judging unit determines that the BFD link is abnormal, the first processing unit sets the BFD message to be in a DOWN state.
On the basis of the technical scheme, the BFD-based flow congestion detection system further comprises a second processing unit, and after the first processing unit sets the BFD message to be in a DOWN state, the second processing unit triggers protection switching to switch the flow to a standby path, so that the flow is recovered to be normal.
Compared with the prior art, the invention has the following advantages:
(1) the invention provides a flow congestion detection mechanism, which is used for detecting the congestion of a link according to the jitter value of a BFD message, can quickly detect the flow congestion and avoid a large amount of packet loss.
(2) The invention also provides a flow recovery mechanism, when the link congestion is detected, the protection switching is triggered, and the flow is switched to the standby path, so that the flow is quickly recovered to be normal, the service quality can be ensured, and the user experience is improved.
Drawings
Fig. 1 is a flowchart of a BFD-based traffic congestion detection method in an embodiment of the present invention.
Fig. 2 is a schematic diagram of a message interval in a normal case.
Fig. 3 is a schematic diagram illustrating that an interval between receiving BFD messages is drastically changed.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
Example 1
Referring to fig. 1, embodiment 1 of the present invention provides a flow congestion detection method based on BFD, including the following steps:
s1, setting a jitter threshold;
the jitter threshold is manually set by a user and is adjustable.
S2, calculating the jitter value of the BFD message according to the receiving interval of the BFD message;
the specific calculation process is as follows:
counting the time interval of receiving two adjacent BFD messages, and recording as a time sequence Ti;
performing Discrete Fourier Transform (DFT) on Ti to obtain a frequency domain sequence Fi;
and taking the number N (Fi) of the frequency domain sequences Fi, wherein N (Fi) is the jitter value of the BFD message.
And S3, comparing the jitter value of the BFD message with a jitter threshold value, and judging whether the BFD link has flow congestion.
And when the jitter value of the BFD message exceeds the jitter threshold value, determining that the BFD link has abnormity and BFD flow congestion occurs. The embodiment of the invention detects whether the link is congested or not according to the jitter value of the BFD message, can quickly detect the flow congestion and avoids a large amount of packet loss.
When the BFD link is detected to be abnormal, setting the BFD message to be in a DOWN state;
and further, triggering protection switching, and switching the flow to a standby path to restore the flow to normal.
The embodiment of the invention also provides a recovery mechanism, which can ensure the service quality under the condition of traffic congestion.
Example 2
On the basis of embodiment 1, before calculating the jitter value of the BFD packet, the method further includes the following steps:
and configuring parameters of the BFD session, wherein the parameters of the BFD session comprise a receiving interval of a BFD message, a fixed sending time interval T and a detection multiple DM, and the receiving interval of the BFD message is jittered within the range of (0, T multiplied by DM).
In practical applications, the initiating end device and the receiving end device configure parameters of the BFD session, which include but are not limited to: a receiving Interval of the BFD packet, a home terminal session identifier, an opposite terminal session identifier, a DMTI (Desired Min Tx Interval, minimum transmission period), an RMRI (Desired Min Rx Interval, minimum reception period), a fixed sending time Interval T, and a detection multiple DM.
The DMTI is the sending interval of the shortest BFD message which the local terminal wants to adopt, the RMRI is the shortest BFD message receiving interval which the local terminal can support, the fixed sending time interval T is related to the DMTI and the RMRI of the two-terminal equipment which establishes the BFD session, and the two-terminal equipment obtains the receiving interval of the BFD message in actual work after negotiation.
The negotiation of the BFD session is successful, the BFD session is established, and the flow situation is shown in fig. 2.
And the initiating terminal equipment transmits the BFD message according to the fixed transmission time interval T, and the receiving terminal equipment continuously receives the BFD message without limiting the receiving interval so as to count jitter.
And the receiving end equipment counts the receiving interval of the BFD messages.
Referring to fig. 2, when the flow is not congested, the receiving interval time of the BFD packet is jittered within a range specified by the BFD protocol.
Referring to fig. 3, when the link flow increases and flow congestion occurs, the BFD flow is severely jittered, and the receiving interval of the BFD packet exceeds the range specified by the BFD protocol. The receiving end equipment detects that the receiving interval of the BFD message is changed drastically, and when the flow processed by the initiating end equipment exceeds the specification of the initiating end equipment, the message sent by the initiating end equipment cannot be transferred at a stable rate according to an expected interval.
In step S3, when the jitter value of the BFD packet exceeds the jitter threshold, it is determined that the BFD link has a traffic congestion, and the traffic congestion can be quickly detected.
When the flow congestion is detected, the BFD session state is set to the DOWN state, the protection switching is triggered, the flow is switched to the standby path, the flow is recovered to be normal, and the service quality can be ensured.
Example 3
On the basis of embodiment 1, when the BFD packet is set to the DOWN state, the DIAG value carried by the BFD packet is 10, which indicates that there is an abnormality in the BFD link.
Four states of the BFD session: the state of "Init" and "Up" is used to describe the process of establishing a BFD session, the state of "Down" represents that there is an exception in the link detected by BFD, and the state of "adminDown" refers to that the state of BFD session is disabled by manual configuration.
The BFD protocol has specified the format of the messages, each BFD message carrying an indication of the DIAG (diagnostic code) value, as specified in the RFC (Request For Comments) protocol:
a DIAG value of 0 indicates no diagnosis: no Diagnostic;
a DIAG value of 1 indicates a control detection timeout: control Detection Time amplified;
a DIAG value of 2 indicates failure of the echo function: echo Function Failed;
when the DIAG value is 3, it indicates that the neighbor signaled session DOWN: neighbor Signaled Session Down;
a DIAG value of 4 indicates a forwarding plane reset: forwarding Plane Reset;
a DIAG value of 5 indicates a path DOWN: path Down;
a DIAG value of 6 indicates the path of the connection DOWN: conditioned Path Down;
when the DIAG value is 7, it indicates that the system management is DOWN: administerratedly Down;
a DIAG value of 8 indicates reverse link DOWN: reverse conditioned Path Down;
a DIAG value of 9-31 indicates future use of the reservation: reserved for future use.
The receiving end equipment detects that the jitter value of the BFD message changes dramatically, and when the flow processed by the initiating end equipment exceeds the specification of the initiating end equipment, the message sent by the initiating end equipment cannot be transferred at a stable rate according to an expected interval.
And after detecting that the jitter value of the BFD message exceeds the jitter threshold value, the receiving end equipment determines that the BFD link is abnormal and BFD flow congestion occurs.
Then setting the BFD message to a DOWN state, assigning a specific value to a diagnostic code DIAG carried by a BFD session in the DOWN state, for example: the DIAG value is 10, which indicates that the BFD link has abnormity; and triggering protection switching to switch the flow to a standby path, so that the flow is recovered to be normal, and the service quality can be ensured.
Example 4
Embodiment 4 of the present invention provides a flow congestion detection system based on BFD, where the system includes a setting unit, a calculating unit, a determining unit, a first processing unit, and a second processing unit, where:
a setting unit configured to: setting a jitter threshold, wherein the jitter threshold is set by a user and is adjustable;
a computing unit to: calculating the jitter value of the BFD message according to the receiving interval of the BFD message;
the specific process of calculating the jitter value of the BFD message by the calculating unit is as follows:
counting the time interval of receiving two adjacent BFD messages, and recording as a time sequence Ti;
performing Discrete Fourier Transform (DFT) on Ti to obtain a frequency domain sequence Fi;
and taking the number N (Fi) of the frequency domain sequences Fi, wherein N (Fi) is the jitter value of the BFD message.
A determination unit configured to: and comparing the jitter value of the BFD message with a jitter threshold value, and judging whether the BFD link has flow congestion or not.
And when the jitter value of the BFD message exceeds the jitter threshold value, the judging unit determines that the BFD link has abnormity and BFD flow congestion occurs.
When the judging unit determines that the BFD link is abnormal, the first processing unit sets the BFD message to be in a DOWN state; then, the second processing unit triggers protection switching to switch the traffic to the standby path, so that the traffic is recovered to be normal.
The invention detects whether the link is congested or not according to the jitter value of the BFD message, can quickly detect the flow congestion, and provides a recovery mechanism under the condition of the flow congestion, thereby ensuring the service quality.
Example 5
On the basis of embodiment 4, the BFD-based traffic congestion detection system further comprises a configuration unit configured to: before calculating the jitter value of the BFD message, configuring parameters of the BFD session, wherein the parameters of the BFD session comprise the receiving interval of the BFD message, a fixed sending time interval T and a detection multiple DM, and the receiving interval of the BFD message is jittered within the range of 0, T multiplied by DM.
In practical applications, the configuration unit of the initiating device and the configuration unit of the receiving device configure parameters of the BFD session, where the parameters of the BFD session include, but are not limited to: a receiving Interval of the BFD packet, a home terminal session identifier, an opposite terminal session identifier, a DMTI (Desired Min Tx Interval, minimum transmission period), an RMRI (Desired Min Rx Interval, minimum reception period), a fixed sending time Interval T, and a detection multiple DM.
The DMTI is the sending interval of the shortest BFD message which the local terminal wants to adopt, the RMRI is the shortest BFD message receiving interval which the local terminal can support, the fixed sending time interval T is related to the DMTI and the RMRI of the two-terminal equipment which establishes the BFD session, and the two-terminal equipment obtains the receiving interval of the BFD message in actual work after negotiation.
The negotiation of the BFD session is successful, the BFD session is established, and the flow situation is shown in fig. 2.
And the initiating terminal equipment transmits the BFD message according to the fixed transmission time interval T, and the receiving terminal equipment continuously receives the BFD message without limiting the receiving interval so as to count jitter.
And the receiving end equipment counts the receiving interval of the BFD messages.
Referring to fig. 2, when the flow is not congested, the receiving interval time of the BFD packet is jittered within a range specified by the BFD protocol.
Referring to fig. 3, when the link flow increases and flow congestion occurs, the BFD flow is severely jittered, and the receiving interval of the BFD packet exceeds the range specified by the BFD protocol. The receiving end equipment detects that the receiving interval of the BFD message is changed drastically, and when the flow processed by the initiating end equipment exceeds the specification of the initiating end equipment, the message sent by the initiating end equipment cannot be transferred at a stable rate according to an expected interval.
And when the jitter value of the BFD message exceeds the jitter threshold value, the judging unit determines that the BFD link has abnormity and BFD flow congestion occurs.
When the judging unit determines that the BFD link is abnormal, the first processing unit sets the BFD message to be in a DOWN state; then, the second processing unit triggers protection switching to switch the traffic to the standby path, so that the traffic is recovered to be normal.
The invention detects whether the link is congested or not according to the jitter value of the BFD message, can quickly detect the flow congestion, and provides a recovery mechanism under the condition of the flow congestion, thereby ensuring the service quality.
Example 6
On the basis of embodiment 4, when the determining unit determines that the BFD link is abnormal, the first processing unit sets the BFD packet to be in a DOWN state, and a DIAG value carried by the BFD packet is 10, which indicates that the BFD link is abnormal.
Four states of the BFD session: the state of "Init" and "Up" is used to describe the process of establishing a BFD session, the state of "Down" represents that there is an exception in the link detected by BFD, and the state of "adminDown" refers to that the state of BFD session is disabled by manual configuration.
The BFD protocol has specified the format of the messages, each BFD message carrying an indication of the DIAG (diagnostic code) value, specified in the RFC protocol:
a DIAG value of 0 indicates no diagnosis: no Diagnostic;
a DIAG value of 1 indicates a control detection timeout: control Detection Time amplified;
a DIAG value of 2 indicates failure of the echo function: echo Function Failed;
when the DIAG value is 3, it indicates that the neighbor signaled session DOWN: neighbor Signaled Session Down;
a DIAG value of 4 indicates a forwarding plane reset: forwarding Plane Reset;
a DIAG value of 5 indicates a path DOWN: path Down;
a DIAG value of 6 indicates the path of the connection DOWN: conditioned Path Down;
when the DIAG value is 7, it indicates that the system management is DOWN: administerratedly Down;
a DIAG value of 8 indicates reverse link DOWN: reverse conditioned Path Down;
a DIAG value of 9-31 indicates future use of the reservation: reserved for future use.
The receiving end equipment detects that the receiving interval of the BFD message is changed drastically, and when the flow processed by the initiating end equipment exceeds the specification of the initiating end equipment, the message sent by the initiating end equipment cannot be transferred at a stable rate according to an expected interval.
And when the jitter value of the BFD message exceeds the jitter threshold value, the judging unit determines that the BFD link has abnormity and BFD flow congestion occurs.
When the judging unit determines that the BFD link is abnormal, the first processing unit sets the BFD message to be in a DOWN state, and assigns a specific value to a diagnostic code DIAG carried by a BFD session in the DOWN state, for example: the DIAG value is 10, which indicates that the BFD link has abnormity; then, the second processing unit triggers protection switching to switch the traffic to the standby path, so that the traffic is recovered to be normal.
Various modifications and variations of the embodiments of the present invention may be made by those skilled in the art, and they are also within the scope of the present invention, provided they are within the scope of the claims of the present invention and their equivalents.
What is not described in detail in the specification is prior art that is well known to those skilled in the art.
Claims (8)
1. A BFD-based flow congestion detection method is characterized by comprising the following steps:
setting a jitter threshold;
calculating the jitter value of the BFD message according to the receiving interval of the BFD message;
comparing the jitter value of the BFD message with a jitter threshold value, and judging whether a BFD link has flow congestion or not;
the method comprises the following steps of calculating the jitter value of the BFD message according to the receiving interval of the BFD message, and the specific process is as follows:
counting the time interval of receiving two adjacent BFD messages, and recording as a time sequence Ti;
performing Discrete Fourier Transform (DFT) on Ti to obtain a frequency domain sequence Fi;
and taking the number N (Fi) of the frequency domain sequences Fi, wherein N (Fi) is the jitter value of the BFD message.
2. The BFD-based traffic congestion detection method of claim 1, wherein: and comparing the jitter value and the jitter threshold value of the BFD message, and judging whether the BFD link has flow congestion, wherein the specific process comprises the following steps:
and when the jitter value of the BFD message exceeds the jitter threshold value, determining that the BFD link has abnormity and BFD flow congestion occurs.
3. The BFD-based traffic congestion detection method of claim 2, wherein: the method further comprises the following steps: and when the BFD link is detected to be abnormal, setting the BFD message to be in a DOWN state.
4. The BFD-based traffic congestion detection method of claim 3, wherein: after setting the BFD message to DOWN state, the method also includes the following steps: and triggering protection switching, switching the flow to a standby path, and enabling the flow to be recovered to be normal.
5. A BFD-based flow congestion detection system is characterized by comprising a setting unit, a calculating unit and a judging unit, wherein:
a setting unit configured to: setting a jitter threshold;
a computing unit to: calculating the jitter value of the BFD message according to the receiving interval of the BFD message;
a determination unit configured to: comparing the jitter value of the BFD message with a jitter threshold value, and judging whether a BFD link has flow congestion or not;
the specific process of calculating the jitter value of the BFD message by the calculating unit is as follows:
counting the time interval of receiving two adjacent BFD messages, and recording as a time sequence Ti;
performing Discrete Fourier Transform (DFT) on Ti to obtain a frequency domain sequence Fi;
and taking the number N (Fi) of the frequency domain sequences Fi, wherein N (Fi) is the jitter value of the BFD message.
6. The BFD-based traffic congestion detection system of claim 5, wherein: the judgment unit is specifically configured to: and when the jitter value of the BFD message exceeds the jitter threshold value, determining that the BFD link has abnormity and BFD flow congestion occurs.
7. The BFD-based traffic congestion detection system of claim 6, wherein: the system also comprises a first processing unit, and when the judging unit determines that the BFD link is abnormal, the first processing unit sets the BFD message to be in a DOWN state.
8. The BFD-based traffic congestion detection system of claim 7, wherein: the system also comprises a second processing unit, and after the first processing unit sets the BFD message to be in a DOWN state, the second processing unit triggers protection switching to switch the flow to a standby path, so that the flow is recovered to be normal.
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| CN104270298A (en) * | 2014-09-30 | 2015-01-07 | 杭州华三通信技术有限公司 | Method and device for forwarding message in VXLAN |
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| CN108075988A (en) * | 2017-11-16 | 2018-05-25 | 华为技术有限公司 | Data transmission method and device |
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| CN108173718A (en) * | 2018-01-29 | 2018-06-15 | 赛特斯信息科技股份有限公司 | The system and method for BFD link detectings and assessment based on SD-WAN scenes |
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| US7248564B1 (en) * | 2001-04-30 | 2007-07-24 | Network Physics, Inc. | Method for determining network congestion and link capacities |
| CN104753733A (en) * | 2013-12-31 | 2015-07-01 | 中兴通讯股份有限公司 | Method and device for detecting abnormal network traffic data |
| CN104270298A (en) * | 2014-09-30 | 2015-01-07 | 杭州华三通信技术有限公司 | Method and device for forwarding message in VXLAN |
| CN108075988A (en) * | 2017-11-16 | 2018-05-25 | 华为技术有限公司 | Data transmission method and device |
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