CN108880868A - BFD keep alive Packet transmission method, device, equipment and machine readable storage medium - Google Patents
BFD keep alive Packet transmission method, device, equipment and machine readable storage medium Download PDFInfo
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- CN108880868A CN108880868A CN201810554562.9A CN201810554562A CN108880868A CN 108880868 A CN108880868 A CN 108880868A CN 201810554562 A CN201810554562 A CN 201810554562A CN 108880868 A CN108880868 A CN 108880868A
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- sequence number
- keep alive
- alive packet
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection
-
- 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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- 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
- H04L43/18—Protocol analysers
-
- 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
- H04L43/50—Testing arrangements
Abstract
The application provides a kind of BFD keep alive Packet transmission method, device, equipment and machine readable storage medium, this method：After local terminal network equipment is switched to slave control board from main control board, start first timer；Before first timer time-out, the first reservation sequence number, and periodicity sending first kind BFD keep alive Packet are being added into the first kind BFD keep alive Packet that peer network device is sent；After first timer time-out, the second reservation sequence number is being added into the second class BFD keep alive Packet that peer network device is sent, and send the second class BFD keep alive Packet.By the technical solution of the application, the first third class BFD keep alive Packet that receive can be abandoned to avoid peer network device, BFD agreement is avoided to shake, during solving masterslave switchover, since the differ greatly agreement of initiation of sequence number shakes problem.
Description
Technical field
This application involves fields of communication technology, more particularly, to a kind of BFD (Bidirectional Forwarding
Detection, two-way converting detection) keep alive Packet transmission method, device, equipment and machine readable storage medium.
Background technique
BFD (Bidirectional Forwarding Detection, two-way converting detection) is general, standardization
, the unrelated quick fault testing mechanism unrelated with agreement of medium, for detecting the two-way converting path between the network equipment.Its
In, local terminal network equipment and peer network device are required to establish BFD session, in local terminal network equipment and peer network device
After state is UP, local terminal network equipment periodically (such as sends primary) every 10 milliseconds and sends BFD guarantor to peer network device
Message living, and peer network device periodically (such as sends primary) every 10 milliseconds and sends BFD keep-alive report to local terminal network equipment
Text.Based on this, if the local terminal network equipment BFD that (such as 30 milliseconds) do not receive peer network device transmission within a preset time is protected
Message living, it is determined that two-way converting path fails, and upper-layer protocol is notified to be further processed.
Summary of the invention
The application provides a kind of BFD keep alive Packet transmission method, described applied to the slave control board of local terminal network equipment
Local terminal network equipment further includes main control board, the method includes：
After the local terminal network equipment is switched to the slave control board from the main control board, the first timing of starting
Device；
Before first timer time-out, first is being added into the first kind BFD keep alive Packet that peer network device is sent
Reservation sequence number, and periodicity sending first kind BFD keep alive Packet；First reservation sequence number is for making the correspondent network
Equipment forbids carrying out sequence number detection to the first kind BFD keep alive Packet；
After first timer time-out, second is being added into the second class BFD keep alive Packet that peer network device is sent
Reservation sequence number, and send the second class BFD keep alive Packet；Second reservation sequence number is for setting the correspondent network
It is standby to forbid carrying out the second class BFD keep alive Packet sequence number detection, and determine BFD keep alive Packet that next time is received into
Row sequence number detection.
The application provides a kind of BFD keep alive Packet transmission method, is applied to peer network device, the peer network device
For receiving the BFD keep alive Packet of local terminal network equipment transmission, and the local terminal network equipment includes main control board and spare
Master control borad, the method includes：
The first kind BFD keep alive Packet for the first reservation sequence number of carrying that local terminal network equipment is sent is received, and according to institute
The first reservation sequence number is stated to forbid carrying out sequence number detection to the first kind BFD keep alive Packet；
The second class BFD keep alive Packet of the second reservation sequence number of carrying that local terminal network equipment is sent is received, and according to institute
It states the second reservation sequence number to forbid carrying out the second class BFD keep alive Packet sequence number detection, and reserved according to described second
Sequence number, which is determined, carries out sequence number detection to the BFD keep alive Packet that next time receives.
The application provides a kind of BFD keep alive Packet transmitting device, described applied to the slave control board of local terminal network equipment
Local terminal network equipment further includes main control board, and described device includes：
Starting module, for being switched to the slave control board from the main control board in the local terminal network equipment
Afterwards, start first timer；
Adding module is used for before first timer time-out, in the first kind BFD keep-alive report sent to peer network device
The first reservation sequence number is added in text, first reservation sequence number is for forbidding the peer network device to described first
Class BFD keep alive Packet carries out sequence number detection；
Sending module is used for periodicity sending first kind BFD keep alive Packet；
The adding module is also used to after first timer time-out, in the second class BFD sent to peer network device
The second reservation sequence number is added in keep alive Packet, second reservation sequence number is for forbidding the peer network device to institute
It states the second class BFD keep alive Packet and carries out sequence number detection, and determine and sequence number inspection is carried out to the BFD keep alive Packet that next time receives
It surveys；
The sending module is also used to send the second class BFD keep alive Packet.
The application provides a kind of BFD keep alive Packet transmitting device, is applied to peer network device, the peer network device
For receiving the BFD keep alive Packet of local terminal network equipment transmission, and the local terminal network equipment includes main control board and spare
Master control borad, described device include：
Receiving module, the first kind BFD keep-alive of the first reservation sequence number of carrying for receiving local terminal network equipment transmission
Message；
Detection module carries out sequence to the first kind BFD keep alive Packet for forbidding according to first reservation sequence number
Row number detection；
The receiving module is also used to receive the second class of the second reservation sequence number of carrying of local terminal network equipment transmission
BFD keep alive Packet；
The detection module is also used to be forbidden according to second reservation sequence number to the second class BFD keep alive Packet
Sequence number detection is carried out, and is determined according to second reservation sequence number and sequence is carried out to the BFD keep alive Packet that next time receives
Number detection.
The application provides a kind of electronic equipment, including：Processor and machine readable storage medium, the machine readable storage
Media storage has the machine-executable instruction that can be executed by the processor, and the processor executes the executable finger of the machine
It enables, to realize above-mentioned method and step.
The application provides a kind of machine readable storage medium, and the machine readable storage medium is stored with the executable finger of machine
It enables, for the machine-executable instruction when being called and being executed by processor, the machine-executable instruction promotes the processor
Realize above-mentioned method and step.
Based on the above-mentioned technical proposal, it in the embodiment of the present application, is switched in local terminal network equipment from main control board spare
After master control borad, slave control board first sends the first kind BFD keep alive Packet for carrying the first reservation sequence number, the first reservation sequence number
For making peer network device forbid carrying out sequence number detection to first kind BFD keep alive Packet；Then, slave control board transmission is taken
The second class BFD keep alive Packet with the second reservation sequence number, the second reservation sequence number is for forbidding peer network device to the
Two class BFD keep alive Packets carry out sequence number detection, and determine and carry out sequence number detection to the BFD keep alive Packet that next time receives；
Then, slave control board just sends the third class BFD keep alive Packet for carrying unreserved sequence number, in this way, peer network device connects
After receiving third class BFD keep alive Packet, the sequence number that first third class BFD keep alive Packet is carried as initial sequence number,
And sequence number detection is carried out to third class BFD keep alive Packet, to avoid abandoning the first third class BFD keep-alive report received
Text, avoid BFD agreement shake, solve masterslave switchover during, due to sequence number differ greatly initiation agreement shake problem.
Detailed description of the invention
It, below will be to the application in order to clearly illustrate the embodiment of the present application or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is only some embodiments as described in this application, for those of ordinary skill in the art, can also be according to this Shen
Please these attached drawings of embodiment obtain other attached drawings.
Fig. 1 is the application scenarios schematic diagram in a kind of embodiment of the application；
Fig. 2 is the flow chart of the BFD keep alive Packet transmission method in a kind of embodiment of the application；
Fig. 3 is the structure chart of the BFD keep alive Packet transmitting device in a kind of embodiment of the application；
Fig. 4 is the structure chart of the BFD keep alive Packet transmitting device in the application another embodiment；
Fig. 5 is the hardware structure diagram of the electronic equipment in a kind of embodiment of the application.
Specific embodiment
In the term that the embodiment of the present application uses merely for the sake of for the purpose of describing particular embodiments, rather than limit this Shen
Please.The "an" of singular used in the application and claims, " described " and "the" are also intended to including most shapes
Formula, unless context clearly shows that other meanings.It is also understood that term "and/or" used herein refers to comprising one
A or multiple associated any or all of project listed may combine.
It will be appreciated that though various letters may be described using term first, second, third, etc. in the embodiment of the present application
Breath, but these information should not necessarily be limited by these terms.These terms are only used to for same type of information being distinguished from each other out.For example,
In the case where not departing from the application range, the first information can also be referred to as the second information, and similarly, the second information can also be with
The referred to as first information.Depending on context, in addition, used word " if " can be construed to " ... when " or
" when ... " or " in response to determination ".
In order to improve the transmission security of BFD keep alive Packet, BFD keep alive Packet can be added using Encryption Algorithm
It is close, and ciphering process can add sequence number, and need to verify sequence number.For example, the first of local terminal network equipment transmission
A BFD keep alive Packet carries sequence number M, and second BFD keep alive Packet carries sequence number M+1, and so on.Peer network device
After receiving first BFD keep alive Packet, records series M after receiving second BFD keep alive Packet, compares second BFD and protects
The sequence number of message living and the difference of sequence number M, if difference is greater than 0 and no more than 9, second BFD keep alive Packet is legal, into
Row subsequent processing, otherwise second BFD keep alive Packet is illegal, abandons second BFD keep alive Packet.
If local terminal network equipment is distributed network equipment, local terminal network equipment includes main control board and spare master control
Plate, main control board send carry sequence number M BFD keep alive Packet after, if main control board breaks down, trigger it is active and standby fall
It changes, BFD keep alive Packet is sent by slave control board, slave control board generates new sequence number R, and sends the BFD for carrying sequence number R
Keep alive Packet.After peer network device receives BFD keep alive Packet, if the difference of R and M is greater than 9 or less than 0, it is believed that BFD keep-alive
Message is illegal, abandons BFD keep alive Packet, should not actually abandon BFD keep alive Packet, to cause the concussion of BFD agreement.
In view of the above-mentioned problems, the embodiment of the present application proposes a kind of BFD keep alive Packet transmission method, can be applied to include this
In the system for holding the network equipment and peer network device, local terminal network equipment and peer network device support BFD agreement, local terminal
The network equipment and peer network device are required to establish BFD session, equal in the state of local terminal network equipment and peer network device
After UP, local terminal network equipment periodically sends BFD keep alive Packet to peer network device, and peer network device is periodically to this
The network equipment is held to send BFD keep alive Packet.
As shown in Figure 1, being the application scenarios schematic diagram of the present embodiment, local terminal network equipment is distributed network equipment, can
To include main control board, slave control board and business board, the quantity of business board can be one or more, for convenience of describing,
Fig. 1 is by taking a business board as an example.Peer network device can be distributed network equipment, may not be distributed network and sets
It is standby, with no restrictions to the type of this peer network device.
When local terminal network equipment periodically sends BFD keep alive Packet to peer network device, if local terminal network equipment
Main control board does not break down, then can generate BFD keep alive Packet by main control board, BFD keep alive Packet is sent to industry
Business plate, is sent to peer network device for BFD keep alive Packet by business board.If event occurs for the main control board of local terminal network equipment
Barrier, then can trigger masterslave switchover, i.e. the slave control board of local terminal network equipment can upgrade to main control board, can be by spare
Master control borad generates BFD keep alive Packet, and BFD keep alive Packet is sent to business board, is sent to BFD keep alive Packet pair by business board
Hold the network equipment.
When local terminal network equipment periodically sends BFD keep alive Packet to peer network device, in order to improve BFD keep-alive
The transmission security of message can also encrypt the BFD keep alive Packet using Encryption Algorithm, which may include
But it is not limited to：MD5 (Message Digest Algorithm5, Message Digest Algorithm 5), M-MD5 (Meticulous
MD5, fine MD5), SHA1 (Secure Hash Algorithm, Secure Hash Algorithm), M-SHA1 (Meticulous SHA1)
Deng with no restrictions to this Encryption Algorithm.
Local terminal network equipment, can also be in BFD keep alive Packet when being encrypted using Encryption Algorithm to BFD keep alive Packet
The BFD keep alive Packet that middle addition sequence number, i.e. local terminal network equipment are sent to peer network device can carry sequence number.Opposite end
The network equipment carries out sequence number detection after receiving the BFD keep alive Packet, to the BFD keep alive Packet；If sequence number detection
Success, then be decrypted BFD keep alive Packet, and whether there is failure using BFD keep alive Packet analysis link；If sequence number is examined
Dendrometry loses, then can abandon the BFD keep alive Packet, and delete BFD session, re-establish BFD neighbours, re-establish BFD session.
For example, first BFD keep alive Packet that local terminal network equipment is sent carries sequence number M, second BFD keep alive Packet
Sequence number M+1 is carried, third BFD keep alive Packet carries sequence number M+2, and so on.Peer network device is receiving
It after one BFD keep alive Packet, determines that BFD keep alive Packet is first BFD keep alive Packet, does not need to carry out sequence number comparison, but
It can recorde the sequence number M of first BFD keep alive Packet.Peer network device needs after receiving second BFD keep alive Packet
Compare the difference of sequence number (such as sequence number N) and sequence number M of second BFD keep alive Packet, if difference is greater than 0 and is not more than
9, then sequence number detection success, it is believed that second BFD keep alive Packet is legal, and the sequence number M of local record is updated to sequence number
BFD keep alive Packet is decrypted in N, and carries out subsequent processing；If difference is greater than 9 or less than 0, sequence number detection failure is recognized
It is illegal for second BFD keep alive Packet, abandon second BFD keep alive Packet.Peer network device receives third BFD keep-alive
After message, compare the sequence number of third BFD keep alive Packet and the difference of sequence number N, detailed process repeats no more, with such
It pushes away.
In another example peer network device after receiving second BFD keep alive Packet, compares second BFD keep alive Packet
Sequence number N and sequence number M difference, if difference is greater than 0, sequence number detection success, it is believed that second BFD keep alive Packet is closed
The sequence number M of local record is updated to sequence number N by method；If difference is not more than 0, sequence number detection failure, it is believed that second
BFD keep alive Packet is illegal, abandons second BFD keep alive Packet.Peer network device is receiving third BFD keep alive Packet
Afterwards, comparing the sequence number of third BFD keep alive Packet and the difference of sequence number N, detailed process repeats no more, and so on.
In conclusion when local terminal network equipment periodically sends BFD keep alive Packet to peer network device, if primary master control
Plate does not break down, then generates BFD keep alive Packet by main control board, BFD keep alive Packet is sent to opposite end by business board
The network equipment, and BFD keep alive Packet carries sequence number.Assuming that main control board sends the BFD keep alive Packet for carrying sequence number M
Afterwards, main control board breaks down, then can trigger masterslave switchover, and slave control board upgrades to main control board, by spare master control
Plate generates BFD keep alive Packet, BFD keep alive Packet is sent to peer network device by business board, and BFD keep alive Packet carries
Sequence number.
But since slave control board does not know the sequence number for the last one BFD keep alive Packet that main control board is sent
For M, therefore, slave control board generates new sequence number R, and new sequence number R is unrelated with sequence number M, and sends and carry sequence number R's
BFD keep alive Packet.Peer network device is after receiving the BFD keep alive Packet, if the difference of R and M is greater than 9 or less than 0, sequence
Row number detection failure, it is believed that BFD keep alive Packet is illegal, abandons BFD keep alive Packet, deletes BFD session, re-establishes BFD neighbours,
BFD session is re-established, and should not actually abandon BFD keep alive Packet, to cause the concussion of BFD agreement.
Certainly, in the above-described embodiments, numerical value 9 and numerical value 0 are the example of the application, without limitation, such as
Numerical value 9 can also be numerical value 6, numerical value 5 etc., herein by taking numerical value 9 and numerical value 0 as an example.
For above-mentioned discovery, in the embodiment of the present application, spare master control is switched to from main control board in local terminal network equipment
After plate, slave control board first sends the first kind BFD keep alive Packet for carrying the first reservation sequence number, and the first reservation sequence number is used for
Peer network device is set to forbid carrying out sequence number detection to first kind BFD keep alive Packet；Then, slave control board, which is sent, carries the
Second class BFD keep alive Packet of two reservation sequence numbers, the second reservation sequence number is for forbidding peer network device to the second class
BFD keep alive Packet carries out sequence number detection, and determines and carry out sequence number detection to the BFD keep alive Packet that next time receives；Then,
Slave control board just sends the third class BFD keep alive Packet for carrying unreserved sequence number, and peer network device receives third class
After BFD keep alive Packet, using the sequence number of first third class BFD keep alive Packet carrying as initial sequence number, and to third class
BFD keep alive Packet carries out sequence number detection, to avoid abandoning third class BFD keep alive Packet, BFD agreement is avoided to shake, solved
Since sequence number differs greatly the concussion problem of initiation during masterslave switchover.
In one example, sequence number size can be 4 bytes (32 bit), and sequence number may be other sizes, right
This is with no restrictions.Two sequence numbers, referred to as the first reservation sequence number and the second reserved sequence can be reserved in all sequences number
Number, and other sequence numbers are unreserved sequence number.For example, sequence number range is 0x00000000-0xFFFFFFFF, it can be with
Using 0x00000000 as the first reservation sequence number, using 0x00000001 as the second reservation sequence number, 0x00000002-
0xFFFFFFFF is non-reservation sequence number.
In one example, the BFD keep alive Packet for carrying the first reservation sequence number can also be known as first kind BFD keep-alive
The BFD keep alive Packet for carrying the second reservation sequence number is known as the second class BFD keep alive Packet, and will carry unreserved sequence by message
The BFD keep alive Packet of row number is known as third class BFD keep alive Packet.
In one example, if main control board does not break down, main control board can generate unreserved sequence at random
Row number, such as 0x00000005, and pass through the third class BFD keep alive Packet that business board will carry unreserved sequence number 0x00000005
1 is sent to peer network device；In next sending cycle, main control board will carry unreserved sequence number by business board
The third class BFD keep alive Packet 2 of 0x00000006 is sent to peer network device；In next sending cycle, main control board
The third class BFD keep alive Packet 3 for carrying unreserved sequence number 0x00000007 is sent to peer network device by business board；
And so on.
When main control board breaks down, then masterslave switchover can be triggered, slave control board upgrades to main control board, by
Slave control board generates BFD keep alive Packet, and BFD keep alive Packet is sent to peer network device by business board.Based on this,
It is shown in Figure 2 after being switched to slave control board from main control board, it is that the BFD keep alive Packet in the embodiment of the present application passes
The flow chart of transmission method, this method may include：
Step 201, after local terminal network equipment is switched to slave control board from main control board, slave control board starting the
One timer.
Step 202, before first timer time-out, slave control board is in the first kind BFD sent to peer network device
The first reservation sequence number, and periodicity sending first kind BFD keep alive Packet are added in keep alive Packet；Wherein, the first reserved sequence
Row number is for making peer network device forbid carrying out sequence number detection to first kind BFD keep alive Packet.
Step 203, peer network device receives the first kind for the first reservation sequence number of carrying that local terminal network equipment is sent
BFD keep alive Packet (first kind BFD keep alive Packet that the slave control board of local terminal network equipment is sent), and it is first reserved according to this
Sequence number is forbidden carrying out sequence number detection to first kind BFD keep alive Packet.
Step 204, after first timer time-out, slave control board is in the second class BFD sent to peer network device
The second reservation sequence number is added in keep alive Packet, and sends the second class BFD keep alive Packet；Second reservation sequence number is for making
Peer network device is forbidden carrying out the second class BFD keep alive Packet sequence number detection, and determines and protect to the BFD that next time receives
Message living carries out sequence number detection.
Step 205, peer network device receives the second class of the second reservation sequence number of carrying that local terminal network equipment is sent
BFD keep alive Packet (the second class BFD keep alive Packet that the slave control board of local terminal network equipment is sent), according to the second reserved sequence
Row number forbids carrying out the second class BFD keep alive Packet sequence number detection, and is determined according to second reservation sequence number to next time
The BFD keep alive Packet received carries out sequence number detection.
In one example, after local terminal network equipment is switched to slave control board from main control board, slave control board
It can star first timer (such as countdown timer T1).Further, before first timer time-out, then spare master control
Plate periodically sends first kind BFD keep alive Packet to peer network device, such as can send multiple first to peer network device
Class BFD keep alive Packet.In addition, then slave control board sends to peer network device and carries the after first timer time-out
Two class BFD keep alive Packets such as can send a second class BFD keep alive Packet to peer network device.
Wherein, before first timer time-out, what slave control board was sent to peer network device is all to carry first in advance
The first kind BFD keep alive Packet of sequence number 0x00000000 is stayed, the first reservation sequence number is a special sequence number, is represented current
Process is the strain phase of masterslave switchover, for making peer network device forbid carrying out sequence number inspection to first kind BFD keep alive Packet
It surveys, that is, peer network device is after receiving first kind BFD keep alive Packet, if discovery first kind BFD keep alive Packet carries first
Reservation sequence number then forbids carrying out the first kind BFD keep alive Packet sequence number detection, only checks and verify encrypted content, go forward side by side
Row subsequent processing.
Wherein, after first timer time-out, slave control board does not retransmit the first kind for carrying the first reservation sequence number
BFD keep alive Packet, and the second class BFD keep-alive report for carrying the second reservation sequence number 0x00000001 is sent to peer network device
Text, the second reservation sequence number are a special sequences number, and the strain phase for representing masterslave switchover terminates, for making peer network device
Forbid the BFD keep-alive report that sequence number detection is carried out to the second class BFD keep alive Packet, and receives peer network device to next time
Text carries out sequence number detection.Peer network device is after receiving the second class BFD keep alive Packet, if the second class BFD keep-alive of discovery
Message the second reservation sequence number of carrying then forbids carrying out the second class BFD keep alive Packet sequence number detection, only checks and verification adds
Close content, and carry out subsequent processing；In addition, peer network device determines that the strain phase of masterslave switchover terminates, need to connect next time
The BFD keep alive Packet received carries out sequence number detection, i.e. sequence number detection process is restored.
In one example, peer network device is receiving first kind BFD keep alive Packet (such as first first kind BFD
Keep alive Packet) after, then it can star second timer (such as countdown timer T2).Further, in second timer time-out
Before, if peer network device receives the second class BFD keep alive Packet, it is determined that BFD detection is normal, deletes second timer.
In second timer time-out, if still not receiving the second class BFD keep alive Packet, it is determined that BFD detection is abnormal, can be actively
BFD agreement is set to down, and BFD session can be deleted, BFD neighbours is re-established, re-establishes BFD session.
Wherein, the time-out time of second timer can be configured rule of thumb, with no restrictions to this time-out time, the
The time-out time of one timer can also be configured rule of thumb, with no restrictions to this time-out time, still, second timer
Time-out time can be more than or equal to first timer time-out time.
Based on this, after first timer time-out, the slave control board of local terminal network equipment, which has begun, sends the second class
BFD keep alive Packet, and second timer at this time has not timed out, therefore, before second timer time-out, peer network device
It should can receive to the second class BFD keep alive Packet.Further, if peer network device does not have before second timer time-out
The second class BFD keep alive Packet is received, then illustrates that slave control board after first timer time-out, does not just send the second class
The BFD keep alive Packet transmitter of BFD keep alive Packet, i.e. slave control board produces existing exception, can actively be set to BFD agreement
down。
In one example, slave control board can also be set after sending the second class BFD keep alive Packet to correspondent network
Unreserved sequence number is added in the third class BFD keep alive Packet that preparation is sent, and it is (i.e. normal to send third class BFD keep alive Packet
Need to carry out the BFD keep alive Packet of sequence number detection) so that the peer network device is according to unreserved sequence number to third class
BFD keep alive Packet carries out sequence number detection.
Further, peer network device receives the third class for the unreserved sequence number of carrying that local terminal network equipment is sent
BFD keep alive Packet (the third class BFD keep alive Packet that the slave control board of local terminal network equipment is sent), and according to the unreserved sequence
Row number carries out sequence number detection to third class BFD keep alive Packet.
In one example, slave control board is added into the third class BFD keep alive Packet that peer network device is sent
Unreserved sequence number may include：Slave control board can generate unreserved sequence number (such as 0x00000002- at random
Arbitrary sequence number in 0xFFFFFFFF), with unreserved Serial No. initial sequence number, in sent to peer network device
The unreserved sequence number is added in three classes BFD keep alive Packet.
In one example, peer network device carries out sequence to third class BFD keep alive Packet according to the unreserved sequence number
Row number detects, and may include：Peer network device is after receiving the second class BFD keep alive Packet, by receive first
The unreserved sequence number that third class BFD keep alive Packet carries is determined as initial sequence number；It is then possible to according to the initial sequence number
Sequence number detection is carried out to third class BFD keep alive Packet.
For example, slave control board is sending the second class BFD keep alive Packet for carrying the second reservation sequence number 0x00000001
Afterwards, unreserved sequence number R (such as 0x00000006) can be generated at random, which is initial sequence number.Then,
Slave control board sends the third class BFD keep alive Packet for carrying unreserved sequence number R to peer network device；In next week
Phase, slave control board send the third class BFD keep alive Packet for carrying unreserved sequence number R+1 to peer network device；Next
A period, slave control board send the third class BFD keep alive Packet for carrying unreserved sequence number R+2 to peer network device；With
This analogizes.
Peer network device carries the second class BFD keep alive Packet of the second reservation sequence number 0x00000001 receiving
Afterwards, it determines and sequence number detection is carried out to the BFD keep alive Packet that receives next time, i.e., the BFD keep alive Packet received next time is the
One BFD keep alive Packet.Then, peer network device is receiving the third class BFD keep alive Packet for carrying unreserved sequence number R
Afterwards, unreserved sequence number R can be determined as to initial sequence number, and since unreserved sequence number R is initial sequence number, no
Sequence number comparison is carried out, directly determines sequence number detection success, it is believed that the third class BFD keep alive Packet is legal, records unreserved
Sequence number R.
After peer network device receives third class BFD keep alive Packet again, need to compare the third class BFD keep alive Packet
Sequence number and unreserved sequence number R difference, if difference is greater than 0 and is not more than 9, sequence number detection success, it is believed that this
Three classes BFD keep alive Packet is legal, and the unreserved sequence number R of local record is updated to the sequence of the third class BFD keep alive Packet
Number.If difference is greater than 9 or less than 0, sequence number detection failure, it is believed that the third class BFD keep alive Packet is illegal, abandons the third
Class BFD keep alive Packet is illegal.
In the above-described embodiments, when slave control board sends BFD keep alive Packet to peer network device, slave control board is
BFD keep alive Packet is sent to peer network device by business board, it is without limitation.
In the above-described embodiments, BFD keep alive Packet can be the UP message of BFD, without limitation.
It in the above-described embodiments, is process of the local terminal network equipment to peer network device transmission BFD keep alive Packet, opposite end
The network equipment sends the process of BFD keep alive Packet to local terminal network equipment, and details are not described herein.
Based on the above-mentioned technical proposal, it in the embodiment of the present application, is switched in local terminal network equipment from main control board spare
After master control borad, slave control board first sends the first kind BFD keep alive Packet for carrying the first reservation sequence number, the first reservation sequence number
For making peer network device forbid carrying out sequence number detection to first kind BFD keep alive Packet；Then, slave control board transmission is taken
The second class BFD keep alive Packet with the second reservation sequence number, the second reservation sequence number is for forbidding peer network device to the
Two class BFD keep alive Packets carry out sequence number detection, and determine and carry out sequence number detection to the BFD keep alive Packet that next time receives；
Then, slave control board just sends the third class BFD keep alive Packet for carrying unreserved sequence number, in this way, peer network device connects
After receiving third class BFD keep alive Packet, the sequence number that first third class BFD keep alive Packet is carried as initial sequence number,
And sequence number detection is carried out to third class BFD keep alive Packet, to avoid abandoning the first third class BFD keep-alive report received
Text, avoid BFD agreement shake, solve masterslave switchover during, due to sequence number differ greatly initiation agreement shake problem.
Based on similarly applying conceiving with the above method, a kind of BFD keep alive Packet transmission is also proposed in the embodiment of the present application
Device, applied to the slave control board of local terminal network equipment, the local terminal network equipment further includes main control board, such as Fig. 3 institute
Show, be the structural schematic diagram of described device, described device includes：
Starting module 301, for being switched to the spare master control from the main control board in the local terminal network equipment
After plate, start first timer；
Adding module 302, for being protected in the first kind BFD sent to peer network device before first timer time-out
The first reservation sequence number is added in message living, first reservation sequence number is for forbidding the peer network device to described
First kind BFD keep alive Packet carries out sequence number detection；
Sending module 303 is used for periodicity sending first kind BFD keep alive Packet；
The adding module 302 is also used to after first timer time-out, in the second class sent to peer network device
The second reservation sequence number is added in BFD keep alive Packet, second reservation sequence number is for forbidding the peer network device
Sequence number detection is carried out to the second class BFD keep alive Packet, and determines and sequence is carried out to the BFD keep alive Packet that next time receives
Number detection；
The sending module 303 is also used to send the second class BFD keep alive Packet.
The adding module 302 is also used to after sending the second class BFD keep alive Packet, to peer network device
Unreserved sequence number is added in the third class BFD keep alive Packet of transmission；
The sending module 303 is also used to send the third class BFD keep alive Packet, so that the peer network device
Sequence number detection is carried out to third class BFD keep alive Packet according to the unreserved sequence number.
The adding module 302 is adding unreserved sequence into the third class BFD keep alive Packet that peer network device is sent
It is specifically used for when row number：Unreserved sequence number is generated at random, with unreserved Serial No. initial sequence number, is set to correspondent network
The unreserved sequence number is added in the third class BFD keep alive Packet that preparation is sent.
Based on similarly applying conceiving with the above method, a kind of BFD keep alive Packet transmission is also proposed in the embodiment of the present application
Device, is applied to peer network device, and the peer network device is used to receive the BFD keep-alive report of local terminal network equipment transmission
Text, and the local terminal network equipment includes main control board and slave control board, as shown in figure 4, the structure for described device is shown
It is intended to, described device includes：
Receiving module 401 is protected for receiving the first kind BFD of the first reservation sequence number of carrying of local terminal network equipment transmission
Message living；Detection module 402, for forbidding carrying out the first kind BFD keep alive Packet according to first reservation sequence number
Sequence number detection；
The receiving module 401 is also used to receive the second of the second reservation sequence number of carrying of local terminal network equipment transmission
Class BFD keep alive Packet；The detection module 402 is also used to be forbidden according to second reservation sequence number to the second class BFD
Keep alive Packet carries out sequence number detection, and the BFD keep alive Packet received to next time is determined according to second reservation sequence number
Carry out sequence number detection.
In one example, described device further includes (being not shown in the figure
Determining module, for after receiving first kind BFD keep alive Packet, then starting second timer；In the second timing
When device time-out, if not receiving the second class BFD keep alive Packet, it is determined that BFD detection is abnormal.
The receiving module 401 is also used to receive the third class of the unreserved sequence number of carrying of local terminal network equipment transmission
BFD keep alive Packet；The detection module 402 is also used to according to the unreserved sequence number to the third class BFD keep alive Packet
Carry out sequence number detection.
Electronic equipment (the slave control board of such as above-mentioned local terminal network equipment, referring to Fig. 3 institute provided by the embodiments of the present application
Show, alternatively, peer network device, shown in Figure 4), for hardware view, hardware structure schematic diagram specifically may refer to figure
Shown in 5, including：Machine readable storage medium and processor, wherein：
Machine readable storage medium：Store instruction code.
Processor：Communicated with machine readable storage medium, read and execute stored in machine readable storage medium it is described
Instruction code realizes the transmission operation of BFD keep alive Packet disclosed in the application above-mentioned example.
Here, machine readable storage medium can be any electronics, magnetism, optics or other physical storage devices, can be with
Include or store information, such as executable instruction, data, etc..For example, machine readable storage medium can be：RAM(Radom
Access Memory, random access memory), volatile memory, nonvolatile memory, flash memory, memory driver is (as hard
Disk drive), solid state hard disk, any kind of storage dish (such as CD, dvd) perhaps similar storage medium or they
Combination.
System, device, module or the unit that above-described embodiment illustrates can specifically realize by computer chip or entity,
Or it is realized by the product with certain function.A kind of typically to realize that equipment is computer, the concrete form of computer can
To be personal computer, laptop computer, cellular phone, camera phone, smart phone, personal digital assistant, media play
In device, navigation equipment, E-mail receiver/send equipment, game console, tablet computer, wearable device or these equipment
The combination of any several equipment.
For convenience of description, it is divided into various units when description apparatus above with function to describe respectively.Certainly, implementing this
The function of each unit can be realized in the same or multiple software and or hardware when application.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes computer usable program code that the embodiment of the present application, which can be used in one or more,
The computer implemented in computer-usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of program product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It is generally understood that being realized by computer program instructions each in flowchart and/or the block diagram
The combination of process and/or box in process and/or box and flowchart and/or the block diagram.It can provide these computer journeys
Sequence instruct to general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices processor with
A machine is generated, so that the instruction generation executed by computer or the processor of other programmable data processing devices is used for
Realize the dress for the function of specifying in one or more flows of the flowchart and/or one or more blocks of the block diagram
It sets.
Moreover, these computer program instructions also can store be able to guide computer or other programmable datas processing set
In standby computer-readable memory operate in a specific manner, so that instruction stored in the computer readable memory generates
Manufacture including command device, the command device are realized in one process of flow chart or multiple processes and/or block diagram one
The function of being specified in a box or multiple boxes.
These computer program instructions can also be loaded into computer or other programmable data processing devices, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer
Or the instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram
The step of function of being specified in one box or multiple boxes.
The above description is only an example of the present application, is not intended to limit this application.For those skilled in the art
For, various changes and changes are possible in this application.All any modifications made within the spirit and principles of the present application are equal
Replacement, improvement etc., should be included within the scope of the claims of this application.
Claims (14)
1. a kind of BFD keep alive Packet transmission method, which is characterized in that described applied to the slave control board of local terminal network equipment
Local terminal network equipment further includes main control board, the method includes：
After the local terminal network equipment is switched to the slave control board from the main control board, start first timer；
It is reserved adding first into the first kind BFD keep alive Packet that peer network device is sent before first timer time-out
Sequence number, and periodicity sending first kind BFD keep alive Packet；First reservation sequence number is for making the peer network device
Forbid carrying out sequence number detection to the first kind BFD keep alive Packet；
It is reserved adding second into the second class BFD keep alive Packet that peer network device is sent after first timer time-out
Sequence number, and send the second class BFD keep alive Packet；Second reservation sequence number is for prohibiting the peer network device
Sequence number detection only is carried out to the second class BFD keep alive Packet, and determines and sequence is carried out to the BFD keep alive Packet that next time receives
Row number detection.
2. the method according to claim 1, wherein the method also includes：
After sending the second class BFD keep alive Packet, add into the third class BFD keep alive Packet that peer network device is sent
Add unreserved sequence number, and send the third class BFD keep alive Packet, so that the peer network device is according to described unreserved
Sequence number carries out sequence number detection to third class BFD keep alive Packet.
3. according to the method described in claim 2, it is characterized in that, described in the third class BFD sent to peer network device
Unreserved sequence number is added in keep alive Packet, including：
Unreserved sequence number is generated at random, and with the unreserved Serial No. initial sequence number, is sent out to peer network device
The unreserved sequence number is added in the third class BFD keep alive Packet sent.
4. a kind of BFD keep alive Packet transmission method, which is characterized in that be applied to peer network device, the peer network device
For receiving the BFD keep alive Packet of local terminal network equipment transmission, and the local terminal network equipment includes main control board and spare
Master control borad, the method includes：
The first kind BFD keep alive Packet for the first reservation sequence number of carrying that local terminal network equipment is sent is received, and according to described the
One reservation sequence number forbids carrying out sequence number detection to the first kind BFD keep alive Packet；
The second class BFD keep alive Packet of the second reservation sequence number of carrying that local terminal network equipment is sent is received, and according to described the
Two reservation sequence numbers forbid carrying out sequence number detection to the second class BFD keep alive Packet, and according to the described second reserved sequence
It number determines and sequence number detection is carried out to the BFD keep alive Packet that receives next time.
5. according to the method described in claim 4, it is characterized in that, the method also includes：
After receiving first kind BFD keep alive Packet, then start second timer；In the second timer time-out, if not
Receive the second class BFD keep alive Packet, it is determined that BFD detection is abnormal.
6. according to the method described in claim 4, it is characterized in that, described determine according to second reservation sequence number to next time
After the BFD keep alive Packet received carries out sequence number detection, further include：
The third class BFD keep alive Packet for the unreserved sequence number of carrying that local terminal network equipment is sent is received, and according to described non-pre-
Sequence number is stayed to carry out sequence number detection to the third class BFD keep alive Packet.
7. a kind of BFD keep alive Packet transmitting device, which is characterized in that described applied to the slave control board of local terminal network equipment
Local terminal network equipment further includes main control board, and described device includes：
Starting module, for opening after the local terminal network equipment is switched to the slave control board from the main control board
Dynamic first timer；
Adding module is used for before first timer time-out, into the first kind BFD keep alive Packet that peer network device is sent
The first reservation sequence number is added, first reservation sequence number is for forbidding the peer network device to the first kind
BFD keep alive Packet carries out sequence number detection；
Sending module is used for periodicity sending first kind BFD keep alive Packet；
The adding module is also used to after first timer time-out, in the second class BFD keep-alive sent to peer network device
Add the second reservation sequence number in message, second reservation sequence number is for forbidding the peer network device to described the
Two class BFD keep alive Packets carry out sequence number detection, and determine and carry out sequence number detection to the BFD keep alive Packet that next time receives；
The sending module is also used to send the second class BFD keep alive Packet.
8. device according to claim 7, which is characterized in that
The adding module is also used to after sending the second class BFD keep alive Packet, in the sent to peer network device
Unreserved sequence number is added in three classes BFD keep alive Packet；
The sending module is also used to send the third class BFD keep alive Packet, so that the peer network device is according to
Unreserved sequence number carries out sequence number detection to third class BFD keep alive Packet.
9. device according to claim 8, which is characterized in that
Adding module tool when adding unreserved sequence number into the third class BFD keep alive Packet that peer network device is sent
Body is used for：Unreserved sequence number is generated at random, with the unreserved Serial No. initial sequence number, is sent out to peer network device
The unreserved sequence number is added in the third class BFD keep alive Packet sent.
10. a kind of BFD keep alive Packet transmitting device, which is characterized in that be applied to peer network device, the peer network device
For receiving the BFD keep alive Packet of local terminal network equipment transmission, and the local terminal network equipment includes main control board and spare
Master control borad, described device include：
Receiving module, the first kind BFD keep alive Packet of the first reservation sequence number of carrying for receiving local terminal network equipment transmission；
Detection module carries out sequence number to the first kind BFD keep alive Packet for forbidding according to first reservation sequence number
Detection；
The receiving module, the second class BFD for being also used to receive the second reservation sequence number of carrying of local terminal network equipment transmission are protected
Message living；
The detection module is also used to be forbidden carrying out the second class BFD keep alive Packet according to second reservation sequence number
Sequence number detection, and determined according to second reservation sequence number and sequence number inspection is carried out to the BFD keep alive Packet that next time receives
It surveys.
11. device according to claim 10, which is characterized in that further include：
Determining module, for after receiving first kind BFD keep alive Packet, then starting second timer；It is super in second timer
Constantly, if not receiving the second class BFD keep alive Packet, it is determined that BFD detection is abnormal.
12. device according to claim 10, which is characterized in that
The receiving module is also used to receive the third class BFD keep-alive of the unreserved sequence number of carrying of local terminal network equipment transmission
Message；
The detection module is also used to carry out sequence number to the third class BFD keep alive Packet according to the unreserved sequence number
Detection.
13. a kind of electronic equipment, which is characterized in that including：Processor and machine readable storage medium, the machine readable storage
Media storage has the machine-executable instruction that can be executed by the processor, and the processor executes the executable finger of the machine
It enables, to realize any method and step of claim 1-3, alternatively, realizing any method step of claim 4-6
Suddenly.
14. a kind of machine readable storage medium, which is characterized in that the machine readable storage medium is stored with the executable finger of machine
It enables, for the machine-executable instruction when being called and being executed by processor, the machine-executable instruction promotes the processor
Any method and step of claim 1-3 is realized, alternatively, realizing any method and step of claim 4-6.
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| CN108880868B (en) | 2021-02-26 |
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