CN102064981A - Bidirectional forwarding detection (BFD) method and system - Google Patents
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Abstract
The invention relates to a bidirectional forwarding detection (BFD) method and a BFD system. The BFD method comprises the following steps that: a BFD home terminal transmits a first detection message which carries network quality detection information; a BFD opposite terminal receives the first detection message and transmits a second detection message which carries the network quality detection information; the BFD home terminal receives the second detection message and detects network quality according to the network quality detection information of the first detection message and the second detection message; and the BFD home terminal reports a network quality detection result according to a preset reporting condition. The BFD method and the BFD system can effectively prevent chain scission.
Description
Technical field
The invention belongs to communication technique field, be specifically related to realize two method and systems of transmitting detection of sending out by the BFD agreement.
Background technology
BFD (two-way forwarding detection) provides a kind of general low expense quick fault testing service for various upper stratas control protocol, and the service that the upper strata control protocol can utilize BFD to provide decides and oneself takes corresponding operating, such as routing again.Why being called two-wayly, is because the BFD agreement by three-way handshake mechanism, can provide the link detection of connectivity of both direction back and forth.BFD can fast detecting the forwarding engine fault etc. of interface to the forward-path and link failure, node, and, upper-layer protocol can be restrained fast the signalling trouble upper-layer protocol.
At present, BFD only is suitable for and detects connectivity of link, that is to say the link information that obtains by BFD, or is communicated with, or disconnect.And some situation, link has a small amount of packet loss usually earlier, a large amount of then packet losses, final chain rupture.When there was a small amount of packet loss in transmission, perhaps present BFD can not find, the business of this moment may be affected, and detects link failure but BFD need wait until the packet loss Shi Caineng that acquires a certain degree.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of bidirectional forwarding detection (BFD) method and system, with effective prevention chain rupture.
For solving above technical problem, the invention provides a kind of bidirectional forwarding detection (BFD) method, this method comprises:
Two-way forwarding detects (BFD) local terminal and sends first detection messages of carrying network quality detection information;
Described BFD opposite end receives described first detection messages, sends to carry second detection messages that network quality detects information;
Described BFD local terminal receives described second detection messages, detects network quality according to the network quality detection information in described first detection messages and second detection messages;
Described BFD local terminal is according to default report condition report network quality testing result.
Further, described network quality detection information comprises test serial number, and described BFD local terminal judges whether packet loss by the test serial number that relatively sends and receive.
Further, described network quality detection information comprises test serial number, described BFD local terminal sends several detection messages successively, and the regular increasing or decreasing of test serial number wherein, after described BFD local terminal receives the detection messages of returning, by test serial number and the preceding test serial number that once receives in the message in the more current reception message successively, calculate number of dropped packets.
Further, described network quality detection information comprises timestamp information, and described BFD local terminal stabs information calculations time delay or shake according to timestamp information in the detection messages that receives and current time.
Further, described detection messages adopts and replys (ECHO) protocol massages.
For solving above technical problem, the present invention also provides a kind of two-way forwarding detection system, and this system comprises that two-way forwarding detects (BFD) local terminal and BFD opposite end, wherein,
The BFD local terminal comprises:
The packet sending and receiving unit is used to send first detection messages of carrying network quality detection information; And receive second detection messages;
The network quality judging unit detects network quality according to the network quality detection information in described first detection messages and second detection messages;
Report the unit, be used for report network quality testing result when meeting report condition;
Described BFD opposite end comprises the packet sending and receiving unit: be used to receive described first detection messages; And described second detection messages that network quality detects information is carried in transmission.
Further, described network quality detection information comprises test serial number, and described network quality judging unit judges whether packet loss by the test serial number that relatively sends and receive.
Further, described network quality detection information comprises test serial number, the packet sending and receiving unit of described BFD local terminal sends several detection messages successively, and the regular increasing or decreasing of test serial number wherein, described network quality judging unit, after the detection messages that reception is returned,, calculate number of dropped packets by test serial number and the preceding test serial number that once receives in the message in the more current reception message successively.
Further, described network quality detection information comprises timestamp information, and described network quality judging unit stabs information calculations time delay or shake according to timestamp information in the detection messages that receives and current time.
Further, described detection messages adopts and replys (ECHO) protocol massages.
Bidirectional forwarding detection (BFD) method of the present invention and system are when detecting the network break-make, detect network quality, as packet loss, time delay, transmission qualities such as shake, be applied in all systems that need enable BFD detection link, detected network quality can be kept supplying the layer service reference, in the network condition instability, but before BFD does not also have chain rupture, just effectively prevent, prevent from just to take measures when link from really breaking down, cause professional the interruption.
Description of drawings
Fig. 1 is the schematic diagram of bidirectional forwarding detection (BFD) method of the present invention;
Fig. 2 is an ECHO message format schematic diagram;
Fig. 3 adopts the ECHO message to realize the embodiment schematic diagram that two-way forwarding detects.
Embodiment
The main thought of bidirectional forwarding detection (BFD) method of the present invention and system is, when detecting the network break-make, detects network quality, as packet loss, time delay, transmission qualities such as shake are applied in all systems that need enable BFD detection link, detected network quality can be kept supplying the layer service reference, in the network condition instability, but before BFD also do not have chain rupture, just effectively prevent, prevent from just to take measures when link from really breaking down, cause professional the interruption.
As shown in Figure 1, bidirectional forwarding detection (BFD) method of the present invention comprises:
Step 101: two-way forwarding detects (BFD) local terminal and sends first detection messages of carrying network quality detection information;
Step 102: described BFD opposite end receives described first detection messages, sends to carry second detection messages that network quality detects information;
Step 103: described BFD local terminal receives described second detection messages, detects network quality according to the network quality detection information in described first detection messages and second detection messages;
Step 104: described BFD local terminal is according to default report condition report network quality testing result.
The foundation that detects network quality can be test serial number, timestamp information etc., as:
Network quality detection information comprises test serial number, and described BFD local terminal judges whether packet loss by the test serial number that relatively sends and receive.
Or, described network quality detection information comprises test serial number, described BFD local terminal sends several detection messages successively, and the regular increasing or decreasing of test serial number wherein, after described BFD local terminal receives the detection messages of returning, by test serial number and the preceding test serial number that once receives in the message in the more current reception message successively, calculate number of dropped packets.
Or described network quality detection information comprises timestamp information, and described BFD local terminal stabs information calculations time delay or shake according to timestamp information in the detection messages that receives and current time.
Certainly, system can provide test serial number and/or timestamp information according to the Network Quality Management needs, or other information, and by setting different report condition (report thresholding or regularly report etc.) such as default, make BFD equipment according to the report condition report network quality of setting, and then make BFD equipment when the network link break-make detects, possess the network quality measuring ability.
Detection messages can adopt multiple message format to realize, below is that example describes to adopt ECHO (response protocol) message:
At first as follows to the ECHO message field (MFLD) brief description among the present invention:
The explanation of Fig. 1 ECHO request message format fields:
Version (V): 2bit ECHO message version is defined as 1.
Type of message (PT): 8bit, ECHO is defined as 1.
Message length (Length): the length of whole ECHO message is unit with the byte.
Local terminal discriminator (My Discriminator): consistent with the My Discriminator field in the BFD message, be used to identify the BFD session of sending the ECHO message.
Far-end discriminator (Your Discriminator): consistent with the Your Discriminator field in the BFD message, if do not receive the message of opposite end, then this field fills out 0.
NTP time stamp (NTP timestmp): 64bit, the NTP timestamp when ECHO sends.The absolute time that NTP (Network Time Protocol NTP (Network Time Protocol)) form is represented is stabbed.Indicate current time stamp when sending the ECHO message and receive the time stamp of recipient when returning to compare, to measure loop time delay.If transmitting system can not obtain this time read, this territory is set to 0 so.
Sequence number (SN): add up 1 during ECHO message of every transmission, detect packet loss, out of order with it during reception.The initial value of SN is at random, and this is to a certain degree preventing plaintext attack.
The relative time stamp of system (timestamp): timestamp is continuous monotonically increasing during transmission, even also be like this when not having the ECHO message to send; When receiving, as long as the sequence of message that receives number is not lost, just know loss of data does not take place, and as long as compare the difference of the timestamp of front and back message, just can determine the time interval that message sends, if system does not support the NTP time stamp, can use this time stamp to measure loop time delay.Initial timestamp must be selected at random.
Service announcements BFD equipment is created session, and informs the device-dependent network quality thresholding of BFD (comprising packet loss, time delay, shake); BFD can be relatively poor to network quality according to these network quality Threshold detection, and certain mass parameter surpasses threshold value, then reporting service.
The process that BFD equipment is created session comprises: ECHO (replying) function was supported in local terminal notice opposite end when BFD consulted; The opposite end also notifies local terminal to support the ECHO function; The session negotiation success, both sides' state is UP, and enables the ECHO function.
With a BFD session model is example, and establishing A is the BFD local terminal, and B is the BFD opposite end, detects the network quality example referring to the BFD session, and as shown in Figure 3, concrete mode may further comprise the steps:
Step 301, A provides timer function, by BFD should be used for being provided with timed sending ECHO message, before sending first ECHO message, the A end produces a SN at random, a timestamp, as initial value, message of follow-up every transmission, monotonic increase;
Step 302, the ECHO transmission timer is overtime, and structure also sends the ECHO message, the SN sequence number that record sends the, NTP time, timestamp value;
A end structure ECHO message, fill in each field according to the ECHO message format: local terminal discriminator and far-end discriminator values are filled in according to the actual value in the session respectively, if do not receive the BFD message of B end, then the far-end discriminator values fills out 0; If A end is supported Network Time Protocol, then need to fill in NTP timestmp field, if do not support then fill out 0; SN gets current value to be sent, adds 1 after the transmission; Timestamp is absolute time not necessarily, does not also have strict unit regulation, can be the tick of system value, can be the millisecond number after system powers on, as long as local terminal can be discerned and enough calculation delays of precision and shake;
Step 303, the ECHO message is received in B end BFD session, transmits back the A end according to the forward-path former state;
Step 304, the A end is received the ECHO message that the B end sends, record timestamp at this moment, the SN sequence number that record is received is calculated packet loss, time delay and shake, reports when exceeding thresholding:
1, with the SN sequence number contrast of the SN sequence number received and transmission, check whether packet loss is arranged,, calculate packet loss if packet loss is arranged:
1.1 if first message of receiving, write down the current sequence number that receives, more consistent with first ECHO test serial number that sends, if it is inconsistent, it may be packet loss, also may be out of order, calculate according to the packet loss hypothesis earlier: first ECHO sequence number of current test serial number-transmission be number of dropped packets; If consistent, then expression does not have packet loss;
1.2 if follow-up message, then compare with last one test serial number of receiving, if with last one to receive message be continuous, then there is not packet loss, upgrade the current sequence number that receives, otherwise calculating packet loss: current test serial number is before the sequence number that received last time, and then the packet loss statistics subtracts 1, does not upgrade the current sequence number that receives; Current test serial number is after the sequence number that received last time and discontinuous, and the test serial number that received then current test serial number-last time-1 is number of dropped packets.
2, the timestamp that will receive delivery time in message timestamp constantly and the message relatively calculates the round network delay of message:
Obtain current NTP time or timestamp time after receiving message, extract NTP timestamp and timestamp in the message,, then preferentially use NTP Time Calculation time delay and shake if enabled the NTP time protocol; Otherwise use timestamp calculation delay and shake.The current NTP time (or timpstamp) is deducted the poor of NTP time (or tempstamp) in the message, be converted into ms, this is to send ECHO from A, transmits through the B end, returns the Loop Round Trip Time of A end.Ignore the B end and transmit the processing time, can think the network round-trip delay.The system that has needs One Way Delay, then can promptly obtain the estimated value of network uni-directional propagation delay time with round-trip delay divided by 2.
3, receiving whenever that a message all calculates obtains a time delay value, and adjacent time delay is relatively got the absolute value of difference, promptly current jitter value.
With the packet loss that obtains, time delay, the thresholding of shake and business setting relatively surpasses professional thresholding, the then current network quality of informing business of reporting.
The present invention accomplishes to detect in real time link-quality by BFD; when quality problems appear in network; perhaps in the time of might not be very serious, report with regard to the network quality data that quantification is arranged, by each business diagnosis data; business has perceived network condition as early as possible; can in time intervene and adjust transmission means or transmission rate, reduce network burden, avoid Network Transmission to interrupt as far as possible; as deciding corresponding measure in its sole discretion, ignore or alleviate present link burden or switch to backup link according to own characteristic.How business is analyzed related data and is taked which kind of measure not describe in the scope at specification of the present invention.
In order to realize above method, the present invention also provides a kind of two-way forwarding detection system, and this system comprises that two-way forwarding detects (BFD) local terminal and BFD opposite end, wherein:
The BFD local terminal comprises:
The packet sending and receiving unit is used to send first detection messages of carrying network quality detection information; And receive second detection messages;
The network quality judging unit detects network quality according to the network quality detection information in described first detection messages and second detection messages;
Report the unit, be used for report network quality testing result when meeting report condition;
Described BFD opposite end comprises the packet sending and receiving unit: be used to receive described first detection messages; And described second detection messages that network quality detects information is carried in transmission.
Further, described network quality detection information comprises test serial number, and described network quality judging unit judges whether packet loss by the test serial number that relatively sends and receive.
Further, described network quality detection information comprises test serial number, the packet sending and receiving unit of described BFD local terminal sends several detection messages successively, and the regular increasing or decreasing of test serial number wherein, described network quality judging unit, after the detection messages that reception is returned,, calculate number of dropped packets by test serial number and the preceding test serial number that once receives in the message in the more current reception message successively.
Further, described network quality detection information comprises timestamp information, and described network quality judging unit stabs information calculations time delay or shake according to timestamp information in the detection messages that receives and current time.
Further, described detection messages adopts and replys (ECHO) protocol massages.
The inventive method and system use the BFD agreement, not only detect the break-make of link, further in time detect and to professional feedback network quality condition, for business reference to adjust network traffics, the service disconnection of taking measures early to prevent.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to finish by program, described program can be stored in the computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Claims (10)
1. a bidirectional forwarding detection (BFD) method is characterized in that, this method comprises:
Two-way forwarding detects (BFD) local terminal and sends first detection messages of carrying network quality detection information;
Described BFD opposite end receives described first detection messages, sends to carry second detection messages that network quality detects information;
Described BFD local terminal receives described second detection messages, detects network quality according to the network quality detection information in described first detection messages and second detection messages;
Described BFD local terminal is according to default report condition report network quality testing result.
2. the method for claim 1, it is characterized in that: described network quality detection information comprises test serial number, and described BFD local terminal judges whether packet loss by the test serial number that relatively sends and receive.
3. the method for claim 1, it is characterized in that: described network quality detection information comprises test serial number, described BFD local terminal sends several detection messages successively, and the regular increasing or decreasing of test serial number wherein, after described BFD local terminal receives the detection messages of returning, by test serial number and the preceding test serial number that once receives in the message in the more current reception message successively, calculate number of dropped packets.
4. the method for claim 1, it is characterized in that: described network quality detection information comprises timestamp information, described BFD local terminal stabs information calculations time delay or shake according to timestamp information in the detection messages that receives and current time.
5. the method for claim 1 is characterized in that: described detection messages adopts replys (ECHO) protocol massages.
6. a two-way forwarding detection system is characterized in that, this system comprises that two-way forwarding detects (BFD) local terminal and BFD opposite end, wherein,
The BFD local terminal comprises:
The packet sending and receiving unit is used to send first detection messages of carrying network quality detection information; And receive second detection messages;
The network quality judging unit detects network quality according to the network quality detection information in described first detection messages and second detection messages;
Report the unit, be used for report network quality testing result when meeting report condition;
Described BFD opposite end comprises the packet sending and receiving unit: be used to receive described first detection messages; And described second detection messages that network quality detects information is carried in transmission.
7. system as claimed in claim 6 is characterized in that: described network quality detection information comprises test serial number, and described network quality judging unit judges whether packet loss by the test serial number that relatively sends and receive.
8. system as claimed in claim 6, it is characterized in that: described network quality detection information comprises test serial number, the packet sending and receiving unit of described BFD local terminal sends several detection messages successively, and the regular increasing or decreasing of test serial number wherein, described network quality judging unit, after the detection messages that reception is returned,, calculate number of dropped packets by test serial number and the preceding test serial number that once receives in the message in the more current reception message successively.
9. system as claimed in claim 6 is characterized in that: described network quality detection information comprises timestamp information, and described network quality judging unit stabs information calculations time delay or shake according to timestamp information in the detection messages that receives and current time.
10. system as claimed in claim 6 is characterized in that: described detection messages adopts replys (ECHO) protocol massages.
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| PCT/CN2011/076007 WO2012088843A1 (en) | 2010-12-29 | 2011-06-21 | Method and system for bidirectional forwarding detection |
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| WO2012088843A1 (en) * | 2010-12-29 | 2012-07-05 | 中兴通讯股份有限公司 | Method and system for bidirectional forwarding detection |
| CN103139014A (en) * | 2013-01-28 | 2013-06-05 | 深信服网络科技（深圳）有限公司 | Method and device for network quality evaluating based on by-pass |
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| CN104104644A (en) * | 2013-04-01 | 2014-10-15 | 中兴通讯股份有限公司 | Bidirectional forwarding detection system and detection time configuration method of bidirectional forwarding detection |
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| CN111654407B (en) * | 2020-04-14 | 2022-05-27 | 新华三信息安全技术有限公司 | Stacking system and bidirectional forwarding detection method thereof |
| CN117881010A (en) * | 2024-03-11 | 2024-04-12 | 广东世炬网络科技有限公司 | Data transmission method, device, equipment and storage medium based on multilink transmission |
| CN117881010B (en) * | 2024-03-11 | 2024-07-16 | 广东世炬网络科技股份有限公司 | Data transmission method, device, equipment and storage medium based on multilink transmission |
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