CN109039728A - Flow congestion detection method and system based on BFD - Google Patents
Flow congestion detection method and system based on BFD Download PDFInfo
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- CN109039728A CN109039728A CN201810820981.2A CN201810820981A CN109039728A CN 109039728 A CN109039728 A CN 109039728A CN 201810820981 A CN201810820981 A CN 201810820981A CN 109039728 A CN109039728 A CN 109039728A
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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
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Abstract
The invention discloses a kind of flow congestion detection method and system based on BFD, are related to flow congestion detection field.Method includes the following steps: setting dithering threshold；According to the reception interval of BFD message, the jitter value of BFD message is calculated；The jitter value and dithering threshold for comparing BFD message, judge whether BFD link occurs flow congestion.The present invention detects link according to the jitter value of BFD message and congestion occurs, and can quickly detect flow congestion, avoid the occurrence of a large amount of packet losses.
Description
Technical field
The present invention relates to flow congestion detection field, be specifically related to a kind of flow congestion detection method based on BFD and
System.
Background technique
In order to protect crucial application, it generally is configured with certain redundancy backup link in network, when network failure,
It asks the network equipment that can quickly detect failure, and flow is switched into backup link, to accelerate network convergence rate.Have at present
A little links, such as: (Packet Service on PACKET OVER SONET/SDH, SONET/SDH, SONET are synchronization optical fiber to POS
Net, SDH are synchronous digital system, and Packet is grouping), by hardware detection mechanism, to realize quick fault testing.But
There are certain links, such as: ethernet link does not have such testing mechanism.At this point, using upper-layer protocol to be relied on itself
Mechanism, to carry out fault detection, the detection time of upper-layer protocol is all at 1 second or more, such failure detection time, to certain
It is flagrant for.
Certain Routing Protocols, such as: OSPF (Open Shortest Path First, ospf),
(Intermediate System to Intermediate System Routing Protocol, intermediate system arrive IS-IS
The routing protocol of intermediate system), although have Fast Hello (integrality quickly detects) function accelerate detect speed,
It is the precision that detection time also can only achieve 1 second, and Fast Hello function is just for this agreement, can not be other associations
View provides quick fault testing.
Network Development makes rapid progress, and with the emergence of new opplication on IP network, also mentions to the service quality of IP network
New requirement is gone out, the best effort of traditional IP can not identify and distinguish between out the various traffic categories in network, and have
The separating capacity of standby traffic category exactly provides the premise of different services for different communication.
BFD (Bidirectional Forwarding Detection, two-way converting detection) agreement is exactly in this back
It is generated under scape, BFD provides the unrelated quick fault testing mechanism unrelated with agreement of a general standardized medium, right
Any medium and agreement can be carried out detecting, and identify and distinguish between out the various traffic categories in network, have the advantage that
(1) fault detection, including direct-connected physical link, void are carried out to any type of two-way converting path of LA Management Room
Circuit, tunnel, MPLS (Multi-Protocol Label Switching, multiprotocol label switching), LSP (Label
Switched Path, label switched path), multihop routing path and one way link etc..
(2) it can be different upper layer application services, the consistent quick fault testing time is provided.
(3) detection time less than 1 second is provided, to accelerate network convergence rate, reduces and applies the break period, improve net
The reliability of network.
In traditional IP network, all messages are all equally treated by nondistinctive, and each forwarding device is to all
The strategy that message is all made of FIFO (First Input First Output, First Input First Output) is handled, it is maximum to the greatest extent
Effort (Best-Effort) message is sent to destination, but the performances such as reliability, propagation delay of message transmission are not provided
Any guarantee.When flow congestion occurs, the best effort mode of traditional network has been unable to meet the needs of practical application, needs out
The flow managing method of sending out new guarantees service quality.
Existing flow congestion testing mechanism are as follows: after flow congestion occurs, a large amount of packet losses occur, can just be judged to sending out
Raw flow congestion, such detection mode, which exists, detects slow-footed disadvantage.
Summary of the invention
The purpose of the invention is to overcome the shortcomings of above-mentioned background technique, a kind of flow congestion inspection based on BFD is provided
Method and system are surveyed, link is detected according to the jitter value of BFD message, congestion occurs, flow congestion can be quickly detected, kept away
Exempt from a large amount of packet losses occur.
The present invention provides a kind of flow congestion detection method based on BFD, comprising the following steps:
Dithering threshold is set；
According to the reception interval of BFD message, the jitter value of BFD message is calculated；
The jitter value and dithering threshold for comparing BFD message, judge whether BFD link occurs flow congestion.
Based on the above technical solution, the reception interval according to BFD message calculates the jitter value of BFD message,
Detailed process are as follows:
Statistics receives the time interval of two neighboring BFD message, is denoted as time series Ti；
Discrete Fourier Transform DFT is carried out to Ti, obtains frequency domain sequence Fi；
Taking the number N (Fi) of frequency domain sequence Fi, N (Fi) is the jitter value of BFD message.
Based on the above technical solution, the jitter value and dithering threshold of the relatively BFD message, judges BFD link
Whether flow congestion, detailed process are occurred are as follows:
When the jitter value of BFD message is more than dithering threshold, it is abnormal to determine that BFD link exists, BFD flow has occurred and gathers around
Plug.
Based on the above technical solution, this method is further comprising the steps of:, will when detecting BFD link exception
BFD message is set to DOWN state.
Based on the above technical solution, further comprising the steps of after BFD message being set to DOWN state: triggering
Flow is switched to backup path by pretection switch, and flow is made to restore normal.
The flow congestion detection system based on BFD that the present invention also provides a kind of, the system include setting unit, calculate list
Member, judging unit, in which:
Setting unit is used for: setting dithering threshold；
Computing unit is used for: according to the reception interval of BFD message, calculating the jitter value of BFD message；
Judging unit is used for: being compared the jitter value and dithering threshold of BFD message, is judged whether BFD link occurs flow and gather around
Plug.
Based on the above technical solution, the computing unit calculates the detailed process of the jitter value of BFD message are as follows:
Statistics receives the time interval of two neighboring BFD message, is denoted as time series Ti；
Discrete Fourier Transform DFT is carried out to Ti, obtains frequency domain sequence Fi；
Taking the number N (Fi) of frequency domain sequence Fi, N (Fi) is the jitter value of BFD message.
Based on the above technical solution, the judging unit is specifically used for: when the jitter value of BFD message is more than shake
When threshold value, it is abnormal to determine that BFD link exists, BFD flow congestion has occurred.
Based on the above technical solution, the flow congestion detection system based on BFD further includes first processing units, institute
When stating judging unit and determining BFD link exception, BFD message is set to DOWN state by first processing units.
Based on the above technical solution, the flow congestion detection system based on BFD further includes the second processing unit, the
After BFD message is set to DOWN state by one processing unit, the second processing unit trigger protection is switched, and flow is switched to spare
Path makes flow restore normal.
Compared with prior art, advantages of the present invention is as follows:
(1) present invention provides a kind of flow congestion testing mechanism, is gathered around according to the jitter value of BFD message to detect link
Plug, can quickly detect flow congestion, avoid the occurrence of a large amount of packet losses.
(2) the present invention also provides a kind of flow Restoration Mechanism, when detecting link congestion, trigger protection is switched, and will be flowed
Amount switches to backup path, keeps the fast quick-recovery of flow normal, can ensure service quality, and promotes user experience.
Detailed description of the invention
Fig. 1 is the flow chart of the flow congestion detection method in the embodiment of the present invention based on BFD.
Fig. 2 is message interval schematic diagram under normal circumstances.
Fig. 3 is the schematic diagram that acute variation occurred at intervals for receiving BFD message.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is described in further detail.
Embodiment 1
Shown in Figure 1, the embodiment of the present invention 1 provides a kind of flow congestion detection method based on BFD, including following step
It is rapid:
S1, setting dithering threshold；
The dithering threshold is user's manual setting, and adjustable.
S2, the reception interval according to BFD message calculate the jitter value of BFD message；
Specific calculating process are as follows:
Statistics receives the time interval of two neighboring BFD message, is denoted as time series Ti；
Discrete Fourier Transform DFT is carried out to Ti, obtains frequency domain sequence Fi；
Taking the number N (Fi) of frequency domain sequence Fi, N (Fi) is the jitter value of BFD message.
S3, the jitter value and dithering threshold for comparing BFD message, judge whether BFD link occurs flow congestion.
When the jitter value of BFD message is more than dithering threshold, it is abnormal to determine that BFD link exists, BFD flow has occurred and gathers around
Plug.The embodiment of the present invention detects whether link occurs congestion according to the jitter value of BFD message, can quickly detect flow and gather around
Plug, avoids the occurrence of a large amount of packet losses.
When detecting BFD link exception, BFD message is set to DOWN state；
Further, trigger protection is switched, and flow is switched to backup path, and flow is made to restore normal.
The embodiment of the invention also provides a kind of Restoration Mechanisms, in the case where flow congestion occurs, can guarantee to service
Quality.
Embodiment 2
On the basis of embodiment 1, further comprising the steps of before the jitter value for calculating BFD message:
The parameter of BFD session is configured, the parameter of BFD session includes between the reception interval of BFD message, fixed sending time
Every T, detection multiple DM, the reception of BFD message is spaced in shake in [0, T*DM] range.
In practical applications, the parameter of end equipment and receiving device configuration BFD session, the parameter packet of BFD session are initiated
It includes but is not limited to: the reception interval of BFD message, local terminal Session ID, opposite end Session ID, DMTI (Desired Min
Tx Interval sends the minimum period), it is RMRI (Required Min Rx Interval, receive minimum period), fixed
Transmission time interval T, detection multiple DM.
DMTI is the transmission interval that local terminal wants the most short BFD message used, and RMRI is the most short BFD that local terminal can be supported
Message receives interval, and DMTI, RMRI of fixed transmission time interval T and the terminal device for establishing BFD session have a relationship, and two
End equipment obtains the reception interval of the BFD message in real work after negotiating.
BFD session negotiation success, establishes BFD session, traffic conditions are shown in Figure 2.
It initiates end equipment and sends BFD message according to fixed transmission time interval T, receiving device persistently receives BFD report
Text does not limit reception interval, to count shake.
The reception interval of receiving device statistics BFD message.
Shown in Figure 2, when flow is without congestion, the reception interval time of BFD message trembles in the range of BFD agreement provides
It is dynamic.
Shown in Figure 3, link flow increases, and when flow congestion occurs, acutely shake occurs for BFD flow, BFD message
Interval is received beyond range as defined in BFD agreement.Receiving device detects that acute variation occurred at intervals in the reception of BFD message,
When initiate end equipment processing flow have exceeded the specification of itself when, initiate end equipment send message can not it is anticipated that between
Every with stable rate transmitting.
In above-mentioned steps S3, when the jitter value of BFD message is more than dithering threshold, determine that BFD link has occurred flow and gathers around
Plug, can quickly detect flow congestion.
When detecting flow congestion, BFD session status is set to DOWN state, trigger protection is switched, and flow is switched to standby
With path, so that flow is restored normal, can guarantee service quality.
Embodiment 3
On the basis of embodiment 1, when BFD message being set to DOWN state, the DIAG value value that BFD message carries is
10, it is abnormal to indicate that BFD link exists.
Four kinds of states of BFD session: AdminDown, Init, Up and Down, wherein " Init " and " Up " state be for
The process of a BFD session is established in description, and it is abnormal that " Down " state indicates that the link of BFD detection exists, and " AdminDown " refers to
Manually configuration makes BFD session status fail.
BFD agreement is it has been specified that message format, each BFD message carry the mark of DIAG (diagnosis code) value, RFC
It is provided in (Request For Comments, request for comments) agreement:
When DIAG value is 0, expression is not diagnosed: No Diagnostic；
When DIAG value is 1, control detection time-out: Control Detection Time Expired is indicated；
When DIAG value is 2, echo function failure: Echo Function Failed is indicated；
When DIAG value is 3, indicate that neighbours sent out the session DOWN:Neighbor Signaled Session of signaling
Down；
When DIAG value is 4, Forwarding plane resetting: Forwarding Plane Reset is indicated；
When DIAG value is 5, path DOWN:Path Down is indicated；
When DIAG value is 6, the path DOWN:Concatenated Path Down of connection is indicated；
When DIAG value is 7, indicate that system administration is allowed to DOWN:Administratively Down；
When DIAG value is 8, reverse link DOWN:Reverse Concatenated Path Down is indicated；
When DIAG value is 9-31, indicates reserved and use in the future: Reserved for future use.
Receiving device detects that acute variation occurs for the jitter value of BFD message, when the flow for initiating end equipment processing is super
When having gone out the specification of itself, initiate message that end equipment is sent can not it is anticipated that interval transmitted with stable rate.
Receiving device detects that the jitter value of BFD message beyond after dithering threshold, determining that it is abnormal that BFD link exists, is sent out
BFD flow congestion is given birth to.
Then BFD message being set to DOWN state, the diagnosis code DIAG that the BFD session of DOWN state carries assigns particular value,
Such as: DIAG value is 10, and it is abnormal to indicate that BFD link exists；Trigger protection is switched again, and flow is switched to backup path, makes to flow
Amount restores normal, can guarantee service quality.
Embodiment 4
The embodiment of the present invention 4 provides a kind of flow congestion detection system based on BFD, which includes setting unit, meter
Calculate unit, judging unit, first processing units, the second processing unit, in which:
Setting unit is used for: setting dithering threshold, and dithering threshold is and adjustable by user setting；
Computing unit is used for: according to the reception interval of BFD message, calculating the jitter value of BFD message；
Computing unit calculates the detailed process of the jitter value of BFD message are as follows:
Statistics receives the time interval of two neighboring BFD message, is denoted as time series Ti；
Discrete Fourier Transform DFT is carried out to Ti, obtains frequency domain sequence Fi；
Taking the number N (Fi) of frequency domain sequence Fi, N (Fi) is the jitter value of BFD message.
Judging unit is used for: being compared the jitter value and dithering threshold of BFD message, is judged whether BFD link occurs flow and gather around
Plug.
When the jitter value of BFD message is more than dithering threshold, it is abnormal that judging unit determines that BFD link exists, and BFD has occurred
Flow congestion.
When judging unit determines BFD link exception, BFD message is set to DOWN state by first processing units；Then, second
Processing unit trigger protection is switched, and flow is switched to backup path, and flow is made to restore normal.
The present invention detects whether link occurs congestion according to the jitter value of BFD message, can quickly detect flow and gather around
Plug, while in the case where flow congestion occurs, a kind of Restoration Mechanism is provided, can guarantee service quality.
Embodiment 5
On the basis of embodiment 4, the flow congestion detection system based on BFD further includes configuration unit, is used for: being calculated
Before the jitter value of BFD message, the parameter of BFD session is configured, the parameter of BFD session includes the reception interval of BFD message, fixation
Transmission time interval T, detection multiple DM, the reception of BFD message is spaced in shake in [0, T*DM] range.
In practical applications, the configuration unit of end equipment and the configuration of described dispensing unit BFD session of receiving device are initiated
The parameter of parameter, BFD session includes but is not limited to: the reception interval of BFD message, local terminal Session ID, opposite end session identification
Symbol, DMTI (Desired Min Tx Interval, send minimum period), RMRI (Required Min Rx Interval,
Receive the minimum period), fixed transmission time interval T, detection multiple DM.
DMTI is the transmission interval that local terminal wants the most short BFD message used, and RMRI is the most short BFD that local terminal can be supported
Message receives interval, and DMTI, RMRI of fixed transmission time interval T and the terminal device for establishing BFD session have a relationship, and two
End equipment obtains the reception interval of the BFD message in real work after negotiating.
BFD session negotiation success, establishes BFD session, traffic conditions are shown in Figure 2.
It initiates end equipment and sends BFD message according to fixed transmission time interval T, receiving device persistently receives BFD report
Text does not limit reception interval, to count shake.
The reception interval of receiving device statistics BFD message.
Shown in Figure 2, when flow is without congestion, the reception interval time of BFD message trembles in the range of BFD agreement provides
It is dynamic.
Shown in Figure 3, link flow increases, and when flow congestion occurs, acutely shake occurs for BFD flow, BFD message
Interval is received beyond range as defined in BFD agreement.Receiving device detects that acute variation occurred at intervals in the reception of BFD message,
When initiate end equipment processing flow have exceeded the specification of itself when, initiate end equipment send message can not it is anticipated that between
Every with stable rate transmitting.
When the jitter value of BFD message is more than dithering threshold, it is abnormal that judging unit determines that BFD link exists, and BFD has occurred
Flow congestion.
When judging unit determines BFD link exception, BFD message is set to DOWN state by first processing units；Then, second
Processing unit trigger protection is switched, and flow is switched to backup path, and flow is made to restore normal.
The present invention detects whether link occurs congestion according to the jitter value of BFD message, can quickly detect flow and gather around
Plug, while in the case where flow congestion occurs, a kind of Restoration Mechanism is provided, can guarantee service quality.
Embodiment 6
On the basis of embodiment 4, when judging unit determines BFD link exception, BFD message is set to by first processing units
DOWN state, the DIAG value value that BFD message carries are 10, and it is abnormal to indicate that BFD link exists.
Four kinds of states of BFD session: AdminDown, Init, Up and Down, wherein " Init " and " Up " state be for
The process of a BFD session is established in description, and it is abnormal that " Down " state indicates that the link of BFD detection exists, and " AdminDown " refers to
Manually configuration makes BFD session status fail.
BFD agreement is it has been specified that message format, each BFD message carry the mark of DIAG (diagnosis code) value, RFC association
It is provided in view:
When DIAG value is 0, expression is not diagnosed: No Diagnostic；
When DIAG value is 1, control detection time-out: Control Detection Time Expired is indicated；
When DIAG value is 2, echo function failure: Echo Function Failed is indicated；
When DIAG value is 3, indicate that neighbours sent out the session DOWN:Neighbor Signaled Session of signaling
Down；
When DIAG value is 4, Forwarding plane resetting: Forwarding Plane Reset is indicated；
When DIAG value is 5, path DOWN:Path Down is indicated；
When DIAG value is 6, the path DOWN:Concatenated Path Down of connection is indicated；
When DIAG value is 7, indicate that system administration is allowed to DOWN:Administratively Down；
When DIAG value is 8, reverse link DOWN:Reverse Concatenated Path Down is indicated；
When DIAG value is 9-31, indicates reserved and use in the future: Reserved for future use.
Receiving device detects that acute variation occurred at intervals in the reception of BFD message, when the flow for initiating end equipment processing
When having exceeded the specification of itself, initiate message that end equipment is sent can not it is anticipated that interval transmitted with stable rate.
When the jitter value of BFD message is more than dithering threshold, it is abnormal that judging unit determines that BFD link exists, and BFD has occurred
Flow congestion.
When judging unit determines BFD link exception, BFD message is set to DOWN state, DOWN state by first processing units
The diagnosis code DIAG that carries of BFD session assign particular value, such as: DIAG value is 10, and it is abnormal to indicate that BFD link exists；Then,
The second processing unit trigger protection is switched, and flow is switched to backup path, and flow is made to restore normal.
Those skilled in the art can carry out various modifications to the embodiment of the present invention and modification, if these modifications and change
For type within the scope of the claims in the present invention and its equivalent technologies, then these modifications and variations are also in protection scope of the present invention
Within.
The prior art that the content being not described in detail in specification is known to the skilled person.
Claims (10)
1. a kind of flow congestion detection method based on BFD, which comprises the following steps:
Dithering threshold is set；
According to the reception interval of BFD message, the jitter value of BFD message is calculated；
The jitter value and dithering threshold for comparing BFD message, judge whether BFD link occurs flow congestion.
2. the flow congestion detection method based on BFD as described in claim 1, it is characterised in that: described according to BFD message
Interval is received, the jitter value of BFD message, detailed process are calculated are as follows:
Statistics receives the time interval of two neighboring BFD message, is denoted as time series Ti；
Discrete Fourier Transform DFT is carried out to Ti, obtains frequency domain sequence Fi；
Taking the number N (Fi) of frequency domain sequence Fi, N (Fi) is the jitter value of BFD message.
3. the flow congestion detection method based on BFD as described in claim 1, it is characterised in that: the relatively BFD message
Jitter value and dithering threshold, judge whether BFD link occurs flow congestion, detailed process are as follows:
When the jitter value of BFD message is more than dithering threshold, it is abnormal to determine that BFD link exists, BFD flow congestion has occurred.
4. the flow congestion detection method based on BFD as claimed in claim 3, it is characterised in that: this method further includes following
Step: when detecting BFD link exception, BFD message is set to DOWN state.
5. the flow congestion detection method based on BFD as claimed in claim 4, it is characterised in that: BFD message is set to DOWN
Further comprising the steps of after state: trigger protection is switched, and flow is switched to backup path, and flow is made to restore normal.
6. a kind of flow congestion detection system based on BFD, which is characterized in that the system includes setting unit, computing unit, sentences
Disconnected unit, in which:
Setting unit is used for: setting dithering threshold；
Computing unit is used for: according to the reception interval of BFD message, calculating the jitter value of BFD message；
Judging unit is used for: being compared the jitter value and dithering threshold of BFD message, is judged whether BFD link occurs flow congestion.
7. the flow congestion detection system based on BFD as claimed in claim 6, it is characterised in that: the computing unit calculates
The detailed process of the jitter value of BFD message are as follows:
Statistics receives the time interval of two neighboring BFD message, is denoted as time series Ti；
Discrete Fourier Transform DFT is carried out to Ti, obtains frequency domain sequence Fi；
Taking the number N (Fi) of frequency domain sequence Fi, N (Fi) is the jitter value of BFD message.
8. the flow congestion detection system based on BFD as claimed in claim 6, it is characterised in that: the judging unit is specific
For: when the jitter value of BFD message is more than dithering threshold, it is abnormal to determine that BFD link exists, BFD flow congestion has occurred.
9. the flow congestion detection system based on BFD as claimed in claim 8, it is characterised in that: the system further includes first
Processing unit, when the judging unit determines BFD link exception, BFD message is set to DOWN state by first processing units.
10. the flow congestion detection system based on BFD as claimed in claim 9, it is characterised in that: the system further includes second
Processing unit, after BFD message is set to DOWN state by first processing units, the second processing unit trigger protection is switched, will
Flow switches to backup path, and flow is made to restore normal.
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