CN110113259A - Path status notification method, path switching method, forwarding device and system - Google Patents
Path status notification method, path switching method, forwarding device and system Download PDFInfo
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- CN110113259A CN110113259A CN201910345906.XA CN201910345906A CN110113259A CN 110113259 A CN110113259 A CN 110113259A CN 201910345906 A CN201910345906 A CN 201910345906A CN 110113259 A CN110113259 A CN 110113259A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/22—Alternate routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
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Abstract
The application provides a kind of path status notification method, path switching method, forwarding device and system, method is applied to the first forwarding device, the described method includes: receive the path detection notice that the second forwarding device is sent, determine that receiving second forwarding device transmits messages literary target incoming interface；Using the next-hop device in the first forwarding device target routing lists item as third forwarding device, the failure of each forward-path between simulation and third forwarding device；It will be in the case where simulating forward-path fault condition, the failure path for causing the corresponding outgoing interface of target routing lists item combination of paths identical with the target incoming interface to be recorded as to generate message reflux combines；When detecting that the forward-path in failure path combination generates failure, failure notification is sent to the second forwarding device.In this way, the state of the second forwarding device timely learning forward-path can be made, to execute the countermeasure such as backup path switching in time, the packet congestion in communication network is avoided.
Description
Technical field
This application involves network communication technology fields, switch in particular to a kind of path status notification method, path
Method, forwarding device and system.
Background technique
In a communication network, in order to improve the redundancy ability of network, important forward node or conversion link can be carried out
Backup.For example, please referring to Fig. 1, host Host1 is connected to forwarding device NE41, and forwarding device NE41 is on the road for acquiring Host1
It notices by being advertised to forwarding device NE31 and NE32 after information, then by NE31 and NE32 to forwarding device NE11.In this way, NE11 meeting
Record two routing iinformations about Host1, the next-hop of this two routing iinformations is NE31 and NE32 respectively, and administrator can be with
Quick heavy-route (Fast Reroute, abbreviation FRR) function is enabled on NE11, specify using NE31 as Host1 it is primary under
One jumps, and NE32 is as spare next-hop.NE11 can establish two-way converting detecting (Bidirectional Forwarding with NE31
Detection, abbreviation BFD) whether session is normal by the forward-path between lasting BFD message interaction detection and NE31.
When NE11 detects that forward-path is normal between NE31 by BFD, the message that NE11 is sent to Host1 can be through NE31 from main road
Diameter is sent to NE41.When NE11 detects the forward-path failure between NE31 by BFD, FRR switching will start, with
The message for being sent to Host1 is switched to and is sent to NE41 through NE32 using standby path.
Summary of the invention
In a first aspect, the application provides a kind of path status notification method, it is applied to the first forwarding device, first forwarding
Equipment is communicated with the second forwarding device, which comprises
The path detection notice that second forwarding device is sent is received, determines that receiving second forwarding device is transmitted messages
The target incoming interface of text；
Using the next-hop device in the first forwarding device target routing lists item as third forwarding device, simulation with it is described
The failure of each forward-path between third forwarding device；
The corresponding outgoing interface of target routing lists item will be caused to enter with the target in the case where simulating forward-path fault condition
The identical combination of paths of interface is recorded as that the failure path combination of message reflux can be generated；
When detecting that the forward-path in the failure path combination generates failure, the second forwarding device of Xiang Suoshu is sent
Failure notification.
Optionally, in the above-mentioned methods, described to lead to the target routing lists item in the case where simulating forward-path fault condition
The failure path that corresponding outgoing interface combination of paths identical with the target incoming interface is recorded as to generate message reflux combines
The step of, comprising:
It detects whether to exist and will lead to the corresponding outgoing interface of target routing lists item event identical with the target incoming interface
Hinder combination of paths；
It will lead to the corresponding outgoing interface of target routing lists item event identical with the target incoming interface if detecting the presence of
Hinder combination of paths, then records failure path group merging with second forwarding device and establish two-way converting detecting BFD session；
It is described when detecting that the forward-path in failure path combination generates failure, the first forwarding device of Xiang Suoshu
The step of sending failure notification, comprising:
When detecting that the forward-path in the failure path combination generates failure, the second forwarding device of Xiang Suoshu is sent
For the BFD session BFD failure message as the failure notification.
Optionally, in the above-mentioned methods, described to lead to the target routing lists item in the case where simulating forward-path fault condition
The failure path that corresponding outgoing interface combination of paths identical with the target incoming interface is recorded as to generate message reflux combines
The step of, comprising:
Respectively be directed to each third forwarding device, detect and record will lead to the target routing lists item it is corresponding go out connect
Mouth failure path identical with the target incoming interface combines and the corresponding relationship of the third forwarding device；
It is described it is actually detected to the failure path combination in forward-path generate failure when, Xiang Suoshu second forward
Equipment sends the step of failure notification, comprising:
When detecting that the forward-path in the combination of any one of failure path generates failure, for the failure road
Diameter combines the corresponding third forwarding device and sends corresponding failure notification to second forwarding device.
Optionally, in the above-mentioned methods, it is directed to each third forwarding device respectively described, detecting and recording can lead
It causes the corresponding outgoing interface of target routing lists item failure path identical with the target incoming interface to combine to set with third forwarding
After the step of standby corresponding relationship, the method also includes:
For each failure path combination that will lead to message reflux, determine that corresponding third is combined with the failure path to be turned
Equipment is sent out, described second turn will be sent to the corresponding relationship of the host and the third forwarding device that access the third forwarding device
Send out equipment.
Optionally, in the above-mentioned methods, described to be directed to each third forwarding device respectively, detecting and recording will lead to
The corresponding outgoing interface of target routing lists item failure path identical with the target incoming interface combines and the third forwarding device
Corresponding relationship the step of, comprising:
It being directed to each third forwarding device respectively, detecting whether corresponding out in the presence of will lead to the target routing lists item
Interface failure path identical with the target incoming interface combines；
It will lead to the corresponding outgoing interface of target routing lists item event identical with the target incoming interface if detecting the presence of
Hinder combination of paths, then establish BFD session with second forwarding device, is had in the message of the BFD session and correspond respectively to meeting
The corresponding status indicator of failure path for causing message to flow back；
It is described when detecting that the forward-path in the combination of any one of failure path generates failure, for the event
Hinder the step of corresponding third forwarding device of combination of paths sends corresponding failure notification to second forwarding device, packet
It includes:
When detecting that the forward-path in failure path combination generates failure, for being combined with the failure path pair
The third forwarding device answered, the second forwarding device of Xiang Suoshu send the BFD state report for carrying the mark of the third forwarding device
Text is used as the failure notification.
Optionally, in the above-mentioned methods, described to be directed to each third forwarding device respectively, detecting and recording will lead to
The corresponding outgoing interface of target routing lists item failure path identical with the target incoming interface combines and the third forwarding device
Corresponding relationship include:
It being directed to each third forwarding device respectively, detecting whether corresponding out in the presence of will lead to the target routing lists item
Interface failure path identical with the target incoming interface combines；
It will lead to the corresponding outgoing interface of target routing lists item event identical with the target incoming interface if detecting the presence of
Hinder combination of paths, then establishes BFD session for the third forwarding device and second forwarding device；
It is described when detecting that the forward-path in the combination of any one of failure path generates failure, for the event
Hinder the step of corresponding third forwarding device of combination of paths sends corresponding failure notification to second forwarding device, packet
It includes:
When the actually detected forward-path in failure path combination generates failure, the determining and failure path group
Close corresponding third forwarding device；
It is directed to the corresponding BFD session of the third forwarding device, the second forwarding device of Xiang Suoshu sends BFD failure message and makees
For the failure notification.
Optionally, in the above-mentioned methods, if it is described detect the presence of cause the corresponding outgoing interface of target routing lists item with
The identical failure path combination of the target incoming interface, then establish for the third forwarding device and second forwarding device
The step of BFD session, comprising:
If detecting the presence of leads to the corresponding outgoing interface of target routing lists item failure identical with the target incoming interface
Combination of paths then sends the BFD session for carrying and presetting and identifying to second forwarding device for the third forwarding device and builds
Vertical request, to establish the BFD session with second forwarding device.
Optionally, in the above-mentioned methods, the path detection notice includes that the BFD session establishment with default mark is asked
It asks；Described the step of receiving the path detection notice that second forwarding device is sent, comprising:
Receive the BFD session establishment request with default mark that second forwarding device is sent.
Second aspect, the application provide a kind of path switching method, are applied to including the first forwarding device and the second forwarding
Equipment communication network；The described method includes:
Second forwarding device is to the first forwarding device transmitting path detection notice；
First forwarding device determines that receiving second forwarding device transmits messages literary target incoming interface, and according to institute
Path detection notice is stated, using the next-hop device in the first forwarding device target routing lists item as third forwarding device, mould
The failure of each forward-path between the quasi- and described third forwarding device；
First forwarding device will simulate forward-path fault condition under, the corresponding outgoing interface of target routing lists item with
The identical combination of paths of the target incoming interface is identified as the failure path combination that will lead to message reflux；
First forwarding device is when detecting that the forward-path in the failure path combination generates failure, Xiang Suoshu
Second forwarding device sends failure notification；
Second forwarding device switches to the message for being sent to the third forwarding device according to the failure notification
Change past spare forwarding device corresponding with first forwarding device.
The third aspect, the application provide a kind of forwarding device, including machine readable storage medium and processor, the machine
Readable storage medium storing program for executing is stored with machine-executable instruction, and the processor promotes this when executing the machine-executable instruction
Forwarding device realizes the path status notification method provided by the present application as the first forwarding device.
Fourth aspect, the application provide a kind of repeater system, including the first forwarding device and the second forwarding device, and shown
One forwarding device and the second forwarding device, which cooperate, realizes the path switching method provided by the present application.
In terms of existing technologies, the application has the advantages that
Path status notification method, path switching method, forwarding device and system provided by the embodiments of the present application pass through
One forwarding device automatically detects to will lead to second in advance after receiving the path detection notice of the second forwarding device transmission
The message that forwarding device is sent to third forwarding device forms the failure path combination of message reflux, and arrives failure road actually detected
Forward-path in diameter combination notifies the second forwarding device when breaking down, and makes the second forwarding device that can forward road with timely learning
The state of diameter, to execute the countermeasure such as backup path switching in time.
Detailed description of the invention
Technical solution in ord to more clearly illustrate embodiments of the present application, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only some embodiments of the application, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is that prior art FRR switches schematic diagram；
Fig. 2 is one of the application scenarios schematic diagram that the application is implemented；
Fig. 3 is the flow diagram of path status notification method provided by the embodiments of the present application；
Fig. 4 is the two of the application scenarios schematic diagram that the application is implemented；
Fig. 5 is the flow diagram of path switching method provided by the embodiments of the present application；
Fig. 6 is the hardware schematic of forwarding device provided by the embodiments of the present application.
Icon: 100- forwarding device；120- machine readable storage medium；130- processor.
Specific embodiment
To keep the purposes, technical schemes and advantages of the embodiment of the present application clearer, below in conjunction with the embodiment of the present application
In attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is
Some embodiments of the present application, instead of all the embodiments.The application being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiments herein provided in the accompanying drawings is not intended to limit below claimed
Scope of the present application, but be merely representative of the selected embodiment of the application.Based on the embodiment in the application, this field is common
Technical staff's every other embodiment obtained without making creative work belongs to the model of the application protection
It encloses.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In some embodiments, the path switching of FRR only depends on BFD session status between two forwarding devices,
This switchover policy possibly can not timely trigger backup path switching in more complicated network environment.
For example, referring to figure 2., in network environment shown in Fig. 2, forwarding device NE11 and forwarding device NE21 and NE22
Neighbours each other, forwarding device NE21 and forwarding device NE22 and NE31 neighbours each other, forwarding device NE22 and forwarding device NE21
With NE32 neighbours each other, forwarding device NE31 and forwarding device NE32 and forwarding device NE41 neighbours each other, forwarding device NE32
With forwarding device NE31 and NE41 neighbours each other.
After NE41 obtains the routing of host Host1, notice to NE31 and NE32, NE31 and NE32 is externally being noticed, and logical
The next-hop of the routing of announcement is respectively modified as NE31 and NE32.After the route synchronization to NE11 of NE31 and NE32 notice, wherein
NE21 and NE22 does not modify the next-hop of routing when noticing and routing to NE11.
NE11 enables FRR, and the routing of notice forms the active and standby next-hop of host Host1 on NE11, be NE31 respectively with
NE32.NE11 can also establish BFD session with NE31, will when detecting that the forward-path between NE31 is normal by BFD session
Destination address is that the message of Host1 is sent to main next-hop NE31；The event of the forward-path between NE31 is detected by BFD session
When barrier, execution FRR, which is switched to, is sent to slave next-hop NE32 for message.
Meanwhile NE31 also enables FRR, the message of NE41 is sent to for NE31, main path is L10 shown in Fig. 2, standby
Path is to pass through L9-L8；And NE31 is sent to the message of NE32, main path L9, standby path is L5-L4-L6.That is,
The message of NE41 is sent on NE31, and there are 3 path outlets on NE31, are L10, L9 and L5 respectively.
In this case, if L10 and L9 break down, but L5 and L3 be it is normal, NE11 think with NE31 it
Between forward-path when it is normal, therefore be not carried out FRR switching, will continue to message being sent to NE31.But again because at this time
L10 and L9 simultaneous faults, message can be sent to NE32 through L5-L4-L6 by N31, then be sent to NE41 by NE32.In other words, message
Reflux is formd on L5, wastes the bandwidth of L5.Although final NE11 can be converged to forward-path directly by some mechanism
It connects and sends NE32 for message, but convergence process needs relatively long time, may cause report temporary on L5 this period
Literary congestion.
In some schemes, administrator can manually configure some inspection policies according to network environment in NE31, thus
Notification triggers FRR switching is sent to NE11 when certain forward-paths break down, but this method needs the hand of administrator
Dynamic analysis and configuration, and need to execute action of configuration on NE31, it is inconvenient.
Based on the discovery to the above problem, the present embodiment provides a kind of to carry out path shape in similar above-mentioned network environment
The scheme of state notice, is below described in detail scheme provided in this embodiment.
Referring to figure 3., Fig. 3 is a kind of flow chart of path status method provided in this embodiment, and this method can be applied
In the first forwarding device communicated with the second forwarding device, for example, first forwarding device can be to turn in networking shown in Fig. 2
Equipment NE31 is sent out, the second forwarding device can be forwarding device NE11, and NE31 can be communicated by NE21 with NE11.It below will be right
The method includes each steps to be described in detail.
Step S110 receives the path detection notice that the second forwarding device is sent, and determines that receiving the second forwarding device is sent out
The target incoming interface of message.
In the present embodiment, it can recorde backup forwarding corresponding with the first forwarding device on the second forwarding device to set
It is standby.For example, for Host1, record has backup forwarding device NE32 corresponding with NE31 on NE11 in Fig. 2.
Administrator can configure on the second forwarding device, with to the first forwarding device transmitting path detection notice.
In the present embodiment, the first forwarding device can set the forwarding of reception second after receiving path detection notice
The interface of standby text of transmitting messages is as target incoming interface.For example, can enter connect using the interface of RX path detection notice as target
Mouthful；The data message for the address that source address is the second forwarding device can also be searched, and the incoming interface of the message found is made
For target incoming interface.
Step S120, using the next-hop device in the first forwarding device target routing lists item as third forwarding device,
The failure of each forward-path between simulation and third forwarding device.
Step S130, will be in the case where simulating forward-path fault condition, and leading to next-hop is the target of the third forwarding device
The corresponding outgoing interface of route table items combination of paths identical with target incoming interface is recorded as that the failure path of message reflux can be generated
Combination.
First forwarding device inquires its route table items and is successively used as target routing lists after receiving path detection notice
, for each target routing lists item, the next-hop of the target routing lists item is used as to third forwarding device, and simulation and third
The failure of each forward-path between forwarding device.
Then whether these forward-paths of the first forwarding device detecting or the failure of forward-path combination will lead to second turn
There is message reflux in the message that hair equipment is sent to third forwarding device.For example, the first forwarding device simulate some forward-path or
Certain multiple forward-path simultaneous faults, and detect because of target routing lists item after the switching of forward-path caused by forward-path failure
Whether corresponding outgoing interface and the target incoming interface determined in step S110 are identical, and it is corresponding out to will lead to the target routing lists item
The failure path that interface combination of paths identical with target incoming interface is recorded as to generate message reflux combines.
For example, NE31 first can determine whether from the corresponding interface of L5 to the report from NE11 in networking shown in Fig. 2
Text.The next-hop of the host Host1 routing of NE31 record includes NE41, then the forward-path event between NE31 simulation and NE41
Barrier.NE31 detects that when L10 and L9 simultaneous faults, next-hop is that the corresponding outgoing interface of route table items of NE41 has become L5 pairs
The message that the outgoing interface answered, i.e. NE11 are sent to NE41 enters NE31 by L5, and sends again from L5, then NE31 judgement is worked as
It will lead to N11 when L10 and L9 simultaneous faults and be sent to the message of NE41 and form reflux on NE31, NE31 will record L10's and L9
Failure path combination.
Step S140 is sent out when detecting that the forward-path in failure path combination generates failure to the second forwarding device
Send failure notification.
After obtaining failure path combination by step S130, the first forwarding device can detect failure path combination in real time
In forward-path state.Once detect failure path combination in forward-path generate failure, the first forwarding device i.e. to
Second forwarding device sends failure notification.For example, in networking shown in Fig. 2, if NE31 detects L10 and L9 simultaneous faults,
Failure notification is sent to NE11.
Second forwarding device can timely execute the change of some forwarding strategies upon receipt of the failure notification, to avoid
The generation of message reflux.For example, NE11 after the failure notification for receiving NE31 transmission, can directly execute FRR switching, switching
It is sent directly to NE32 to the message for being issued to Host1, generates message reflux at NE31 to avoid message.
By above-mentioned design, in scheme provided in this embodiment, the first forwarding device is sent by the second forwarding device
Path detection notice know that the second forwarding device needs to know the demand of path status, then automatically for second forwarding set
It is standby to detect and record in the presence of the failure that will lead to the message generation message reflux for being sent to third forwarding device by the second forwarding device
Combination of paths, and it is actually detected to failure path combination in forward-path failure when notify the second forwarding device, to make
Second forwarding device can execute corresponding reply movement in time come congestion caused by avoiding message from flowing back, and improve network can
By property.
Optionally, in step s 130, the first forwarding device, which can first detect whether to exist, will lead to the target routing lists
The corresponding outgoing interface of item failure path identical with target incoming interface combines.
It will lead to the corresponding outgoing interface of target routing lists item failure identical with target incoming interface road if detecting the presence of
Diameter combination then records failure path group merging with the second forwarding device and establishes BFD session.
Later, the first forwarding device, can be to the when detecting that the forward-path in failure path combination generates failure
Two forwarding devices send the BFD failure message for BFD session as failure notification.
In an embodiment of the present embodiment, the request of BFD session establishment can be initiated by the second forwarding device.Example
Such as, in step s 110, one is sent by the second forwarding device carry the BFD session establishment request of preset field as path
Detection notice.The preset field can control mark (flag) type increased newly in message for BFD.
Then in step s 130, if the first forwarding device detects the presence of will lead to the target routing lists item it is corresponding go out
Interface failure path identical with target incoming interface combines, then responds the BFD session establishment request of the second forwarding device, thus with
Second forwarding device establishes BFD session, and association the BFD session is combined with failure path.
In the another embodiment of the present embodiment, BFD session request can also be initiated by the first forwarding device.Example
Such as, in step s 110, the first forwarding device can be with any form of advice method transmitting path detection notice.
Then in step s 130, if the first forwarding device detects the presence of will lead to the target routing lists item it is corresponding go out
Interface failure path identical with target incoming interface combines, then initiates the request of BFD session establishment to the second forwarding device, to establish
Associated BFD session is combined with failure path.
First forwarding device and the second forwarding device are established after BFD session, once it detects in failure path combination
Forward-path breaks down, i.e., sends BFD failure message as failure notification to the second forwarding device, for example, sending BFD message
It is middle to set down for local state.
Second forwarding device can will establish BFD session and be associated with backup path switching action, receive BFD failure report
The switching that backup path is triggered after text, the message of primary past third forwarding device is switched to be sent to corresponding with the first forwarding device
Backup forwarding device.
By above-mentioned design, by way of BFD session, fault message can promptly be transmitted, and BFD session can be with
The second forwarding device can be made automatically to trigger the movement that backup path switches with the mechanism of backup link switching action binding.
Optionally, in the present embodiment, there may be multiple next-hop devices in the route table items of the first forwarding device not
With target routing lists item, i.e. multiple target routing lists configured with corresponding different third forwarding devices in the first forwarding device
, such as referring to figure 4., it includes NE41 that NE31, which has recorded the corresponding next-hop of Host1, and it is corresponding next that Host2 is also recorded
Jumping includes NE51.
In this case, in the step s 120, the first forwarding device can be directed to each next-hop device conduct respectively
Third forwarding device, and the failure of each forward-path between these third forwarding devices is simulated respectively.
Then in step s 130, be directed to each third forwarding device respectively, detect and record cause next-hop be this
The corresponding outgoing interface of the target routing lists item failure path identical with target incoming interface of three forwarding devices is combined to be turned with the third
Send out the corresponding relationship of equipment.
For example, NE31 is directed to the failure of NE41 and NE51 simulation conversion link respectively in networking shown in Fig. 4.According to mould
Intend the corresponding relationship as a result, the failure path combination and NE41 of NE31 record L9 and L10, and records the failure path of L9 and L11
The corresponding relationship of combination and NE51.
In step S140, when detecting that the forward-path in the combination of any one failure path generates failure, for
Corresponding third forwarding device is combined with the failure path, sends event corresponding with the third forwarding device to the second forwarding device
Barrier notice.
For example, sending failure notification to NE11 for NE41 if NE31 detects L9 and L10 simultaneous faults.If
NE31 detects L9 and L11 simultaneous faults, then sends failure notification to NE11 for NE51.
In an embodiment of the present embodiment, after step s 130, the first forwarding device can also be for each
The failure path combination that will lead to message reflux, determines and combines corresponding third forwarding device with the failure path, then determining should
Next-hop is the host of the third forwarding device in the target routing lists item of first forwarding device, these hosts and the third are turned
The corresponding relationship of hair equipment is advertised to the second forwarding device.For example, NE31 check L9 and L10 failure will lead to message reflux
Afterwards, the corresponding relationship of NE41 and Host1 are sent to NE11.
In this way, after the second forwarding device receives failure notification corresponding with third forwarding device, according to the first forwarding
The corresponding relationship of equipment notice, the switching of backup link is executed for corresponding host.
In the another embodiment of the present embodiment, NE41, can be in the routing of notice when noticing the routing of Host1
The routing is added in information to be generated by NE41.For example, NE41 passes through Border Gateway Protocol (Border Gateway
Protocol, BGP) message externally notices routing, and the routing is carried in the extended community attribute of bgp route advertisement message
It is to be generated by NE41.
NE11 can know the road after the routing that the slave NE41 for receiving NE31 notice is obtained from extended community attribute
By being generated by NE41, so that the corresponding relationship of Host1 and NE41 be recorded.
Optionally, in step s 110, the first forwarding device can be detected with any form of advice method transmitting path
Notice.In step s 130, the first forwarding device can be directed to each third forwarding device respectively, detect whether in the presence of under causing
One jump is that the corresponding outgoing interface of the target routing lists item failure path identical with target incoming interface of the third forwarding device combines.
If detecting the presence of causes next-hop to be the corresponding outgoing interface of target routing lists item and mesh of the third forwarding device
The identical failure path combination of incoming interface is marked, then establishes BFD session for the third forwarding device and the second forwarding device.Example
Such as, NE31 can initiate the session establishment request of a BFD for NE41 to NE11, and the mark letter of NE41 can be carried in request
Breath establishes the second forwarding device and the associated BFD session of NE41；NE31 initiates a BFD meeting also directed to NE51 again to NE11
Words establish request, and the identification information of NE51 can be carried in request, establish the second forwarding device and the associated BFD meeting of NE51
Words.
Then it in step S140, when the actually detected forward-path in failure path combination generates failure, determines
Corresponding third forwarding device is combined with the failure path, and is directed to the corresponding BFD session of the third forwarding device, to second
Forwarding device sends BFD failure message as failure notification.For example, being associated with when detecting L9 and L10 failure for NE41
BFD session send BFD failure message as failure notification.
Second forwarding device determines third corresponding with the BFD session after receiving the BFD failure message of BFD session
Forwarding device, and determine host corresponding with the third forwarding device, then these hosts are executed with the switching of backup path.Such as
This, only can carry out FRR switching to the path that can generate message reflux, the forward-path without influencing other normal works.
Optionally, in step s 130, the first forwarding device can be directed to each third forwarding device respectively, detect whether
It is identical with target incoming interface former for the corresponding outgoing interface of target routing lists item of the third forwarding device in the presence of next-hop is caused
Hinder combination of paths.
If detect the presence of will lead to next-hop be the third forwarding device the corresponding outgoing interface of target routing lists item with
The identical failure path combination of target incoming interface, then establish BFD session with the second forwarding device.Wherein, the message of the BFD session
In may include corresponding different third forwarding devices different conditions identification field.
Then in step S140, the first forwarding device can be generated detecting the forward-path in failure path combination
When failure, for corresponding third forwarding device is combined with the failure path, the third is carried to the transmission of the second forwarding device
The BFD state message of the mark of forwarding device is as failure notification.In other words, the first forwarding device can be by same
The path status of multiple third forwarding devices is noticed in BFD session to the second forwarding device.
For example, BFD session is established in the failure path combination that NE31 detection will lead to message reflux with NE11, meeting is being established
When words, NE31 can BFD session establishment request message or response NE11 session establishment request message in carry NE41 and
The identification information of NE51.Two status indicator positions of NE41 and NE51 are respectively corresponded in the control message of the BFD session, NE31 exists
When detecting that the forward-path in the corresponding failure path combination of NE41 or NE51 breaks down, the mark of BFD session can be passed through
Know position and informs NE11 roadblock notice.
Referring to figure 5., Fig. 5 is a kind of process of path switching method provided in this embodiment into schematic diagram, and this method can
Be applied to include the first forwarding device and the second forwarding device communication network, for example, be applied to include Fig. 2 shown in NE31 and
The communication network of NE11.In the present embodiment, the second forwarding device can recorde the active and standby next-hop routing of destination host,
In, main next-hop is the first forwarding device, and slave next-hop is backup forwarding device corresponding with the first forwarding device.For example,
In networking shown in Fig. 2, NE11 can recorde the routing of the Host1 by NE31 and NE32 notice, and form active and standby next-hop.Below
Each step of this method is illustrated.
Step S210, the second forwarding device is to the first forwarding device transmitting path detection notice.
Step S220, the first forwarding device determine that receiving the second forwarding device transmits messages literary target incoming interface, and according to
Path detection notice, using the next-hop device in the first forwarding device target routing lists item as third forwarding device, simulation
The failure of each forward-path between third forwarding device.
Step S230, the first forwarding device will simulate under forward-path fault condition, and the target routing lists item is corresponding out
Interface combination of paths identical with target incoming interface be identified as will lead to message reflux failure path combine.
Step S240, the first forwarding device is when detecting that the forward-path in failure path combination generates failure, to the
Two forwarding devices send failure notification.
Step S250, the second forwarding device switch to switching according to failure notification, by the message for being sent to third forwarding device
It is sent to spare forwarding device corresponding with the first forwarding device.
Wherein, in step S210, the second forwarding device can be under the operation of administrator control to the first forwarding device
Transmitting path detection notice.
The detailed process of step S220 to step S240 step S120 shown in Figure 3 are to step S140, herein no longer
It repeats.
The second forwarding device can automatically trigger switching action according to failure notification in step s 250, for example, second
FRR function is started on forwarding device, and FRR can automatically be triggered according to the failure notification that the first forwarding device is sent and cut
It changes.
Fig. 6 is please referred to, Fig. 6 is a kind of hardware structural diagram of forwarding device 100 provided in this embodiment.The forwarding is set
Standby 100 may include processor 130 and machine readable storage medium 120.Processor 130 and machine readable storage medium 120 can be through
It is communicated by system bus.Also, machine readable storage medium 120 is stored with machine-executable instruction, by reading and executing machine
Machine-executable instruction corresponding with path status notification logic in device readable storage medium storing program for executing 120, processor 130 are executable above
The path status notification method of description.
Machine readable storage medium referred to herein can be any electronics, magnetism, optics or other physical stores dress
It sets, may include or store information, such as executable instruction, data, etc..For example, machine readable storage medium may is that RAM
(Radom Access Memory, random access memory), volatile memory, nonvolatile memory, flash memory, storage driving
Device (such as hard disk drive), solid state hard disk, any kind of storage dish (such as CD, DVD) or similar storage medium,
Or their combination.
The present embodiment also provides a kind of repeater system, which may include above-mentioned first forwarding device and second turn
Equipment is sent out, first forwarding device and the second forwarding device, which cooperate, realizes method shown in fig. 5.
In conclusion path status notification method provided by the embodiments of the present application, path switching method, forwarding device and being
System automatically detects in advance through the first forwarding device after receiving the path detection notice of the second forwarding device transmission
It will lead to the failure path combination that the second forwarding device is sent to the message formation message reflux of third forwarding device, and in practical inspection
It measures when the forward-path in failure path combination breaks down and notifies the second forwarding device, keep the second forwarding device timely
The state of forward-path is known, to execute the countermeasure such as backup path switching in time.
In embodiment provided herein, it should be understood that disclosed device and method, it can also be by other
Mode realize.The apparatus embodiments described above are merely exemplary, for example, the flow chart and block diagram in attached drawing are shown
According to device, the architectural framework in the cards of method and computer program product, function of multiple embodiments of the application
And operation.In this regard, each box in flowchart or block diagram can represent one of a module, section or code
Point, a part of the module, section or code includes one or more for implementing the specified logical function executable
Instruction.It should also be noted that function marked in the box can also be attached to be different from some implementations as replacement
The sequence marked in figure occurs.For example, two continuous boxes can actually be basically executed in parallel, they sometimes may be used
To execute in the opposite order, this depends on the function involved.It is also noted that each of block diagram and or flow chart
The combination of box in box and block diagram and or flow chart can be based on the defined function of execution or the dedicated of movement
The system of hardware is realized, or can be realized using a combination of dedicated hardware and computer instructions.
In addition, each functional module in each embodiment of the application can integrate one independent portion of formation together
Point, it is also possible to modules individualism, an independent part can also be integrated to form with two or more modules.
It, can be with if the function is realized and when sold or used as an independent product in the form of software function module
It is stored in a computer readable storage medium.Based on this understanding, the technical solution of the application is substantially in other words
The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a
People's computer, server or network equipment etc.) execute each embodiment the method for the application all or part of the steps.
And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic or disk.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The above, the only various embodiments of the application, but the protection scope of the application is not limited thereto, it is any
Those familiar with the art within the technical scope of the present application, can easily think of the change or the replacement, and should all contain
Lid is within the scope of protection of this application.Therefore, the protection scope of the application shall be subject to the protection scope of the claim.
Claims (11)
1. a kind of path status notification method, which is characterized in that be applied to the first forwarding device, first forwarding device and second
Forwarding device communication, which comprises
The path detection notice that second forwarding device is sent is received, determining reception second forwarding device is transmitted messages literary
Target incoming interface；
Using the next-hop device in the first forwarding device target routing lists item as third forwarding device, simulation and the third
The failure of each forward-path between forwarding device；
It will lead to the corresponding outgoing interface of target routing lists item and the target incoming interface in the case where simulating forward-path fault condition
Identical combination of paths is recorded as that the failure path combination of message reflux can be generated；
When detecting that the forward-path in the failure path combination generates failure, the second forwarding device of Xiang Suoshu sends failure
Notice.
2. the method according to claim 1, wherein
It is described the corresponding outgoing interface of target routing lists item to be caused to enter with the target in the case where simulating forward-path fault condition
The identical combination of paths of interface is recorded as the step of generating the failure path combination of message reflux, comprising:
It detects whether to exist and will lead to the corresponding outgoing interface of target routing lists item failure road identical with the target incoming interface
Diameter combination；
It will lead to the corresponding outgoing interface of target routing lists item failure road identical with the target incoming interface if detecting the presence of
Diameter combination then records failure path group merging with second forwarding device and establishes two-way converting detecting BFD session；
It is described when detecting that the forward-path in failure path combination generates failure, the first forwarding device of Xiang Suoshu is sent
The step of failure notification, comprising:
When detecting that the forward-path in the failure path combination generates failure, the transmission of the second forwarding device of Xiang Suoshu is directed to
The BFD failure message of the BFD session is as the failure notification.
3. the method according to claim 1, wherein configured with described in corresponding difference in first forwarding device
Multiple target routing lists items of third forwarding device；
It is described the corresponding outgoing interface of target routing lists item to be caused to enter with the target in the case where simulating forward-path fault condition
The identical combination of paths of interface is recorded as the step of generating the failure path combination of message reflux, comprising:
It is directed to each third forwarding device respectively, detect and records the target that will lead to that next-hop is the third forwarding device
The corresponding outgoing interface of route table items failure path identical with the target incoming interface combines and the correspondence of the third forwarding device
Relationship；
It is described it is actually detected to the failure path combination in forward-path generate failure when, the second forwarding device of Xiang Suoshu
The step of sending failure notification, comprising:
When detecting that the forward-path in the combination of any one of failure path generates failure, for the failure path group
It closes the corresponding third forwarding device and sends corresponding failure notification to second forwarding device.
4. according to the method described in claim 3, it is characterized in that, it is described respectively be directed to each third forwarding device,
Detect and record will lead to next-hop be the third forwarding device the corresponding outgoing interface of target routing lists item enter with the target
After the step of identical failure path combination of interface and the corresponding relationship of the third forwarding device, the method also includes:
For each failure path combination that will lead to message reflux, determine that corresponding third forwarding is combined with the failure path to be set
It is standby, it is set second forwarding is sent to the corresponding relationship of the host and the third forwarding device that access the third forwarding device
It is standby.
5. according to the method described in claim 3, it is characterized in that,
Described to be directed to each third forwarding device respectively, detecting and recording will lead to next-hop as the third forwarding device
The corresponding outgoing interface of target routing lists item failure path identical with the target incoming interface combines and the third forwarding device
The step of corresponding relationship, comprising:
It is directed to each third forwarding device respectively, detects whether there is the mesh that will lead to that next-hop is the third forwarding device
The corresponding outgoing interface of mark route table items failure path identical with the target incoming interface combines；
If detect the presence of will lead to next-hop be the third forwarding device the corresponding outgoing interface of target routing lists item with it is described
The identical failure path combination of target incoming interface, then establish BFD session with second forwarding device, the message of the BFD session
In with the corresponding status indicator of failure path for corresponding respectively to will lead to message reflux；
It is described when detecting that the forward-path in the combination of any one of failure path generates failure, for the failure road
Diameter combines the step of corresponding third forwarding device sends corresponding failure notification to second forwarding device, comprising:
It is corresponding for being combined with the failure path when detecting that the forward-path in the failure path combination generates failure
Third forwarding device, the BFD state message that the second forwarding device of Xiang Suoshu sends the mark for carrying the third forwarding device are made
For the failure notification.
6. according to the method described in claim 3, it is characterized in that,
Described to be directed to each third forwarding device respectively, detecting and recording will lead to next-hop as the third forwarding device
The corresponding outgoing interface of target routing lists item failure path identical with the target incoming interface combines and the third forwarding device
Corresponding relationship includes:
It is directed to each third forwarding device respectively, detects whether there is the mesh that will lead to that next-hop is the third forwarding device
The corresponding outgoing interface of mark route table items failure path identical with the target incoming interface combines；
If detect the presence of will lead to next-hop be the third forwarding device the corresponding outgoing interface of target routing lists item with it is described
The identical failure path combination of target incoming interface, then establish BFD meeting for the third forwarding device and second forwarding device
Words；
It is described when detecting that the forward-path in the combination of any one of failure path generates failure, for the failure road
Diameter combines the step of corresponding third forwarding device sends corresponding failure notification to second forwarding device, comprising:
When the actually detected forward-path in failure path combination generates failure, determines and combined with the failure path pair
The third forwarding device answered；
It is directed to the corresponding BFD session of the third forwarding device, the second forwarding device of Xiang Suoshu sends BFD failure message as institute
State failure notification.
7. according to the method described in claim 6, it is characterized in that, if described detect the presence of causes next-hop to turn for the third
The corresponding outgoing interface of the target routing lists item failure path identical with the target incoming interface of hair equipment combines, then be directed to this
The step of three forwarding devices and second forwarding device establish BFD session, comprising:
If detecting the presence of causes next-hop to be the corresponding outgoing interface of target routing lists item and the mesh of the third forwarding device
The identical failure path combination of incoming interface is marked, then is carried for the third forwarding device to second forwarding device transmission pre-
The BFD session establishment request that bidding is known, to establish the BFD session with second forwarding device.
8. method described in -6 any one according to claim 1, which is characterized in that the path detection notice includes with pre-
The BFD session establishment request that bidding is known；Described the step of receiving the path detection notice that second forwarding device is sent, packet
It includes:
Receive the BFD session establishment request with default mark that second forwarding device is sent.
9. a kind of path switching method, which is characterized in that be applied to include the first forwarding device and the second forwarding device communication network
Network；The described method includes:
Second forwarding device is to the first forwarding device transmitting path detection notice；
First forwarding device determines that receiving second forwarding device transmits messages literary target incoming interface, and according to the road
Diameter detection notice, using the next-hop device in the first forwarding device target routing lists item as third forwarding device, simulation with
The failure of each forward-path between the third forwarding device；
First forwarding device will simulate forward-path fault condition under, the corresponding outgoing interface of target routing lists item with it is described
The identical combination of paths of target incoming interface is identified as the failure path combination that will lead to message reflux；
First forwarding device is when detecting that the forward-path in the failure path combination generates failure, Xiang Suoshu second
Forwarding device sends failure notification；
Second forwarding device switches to switching hair according to the failure notification, by the message for being sent to the third forwarding device
Past spare forwarding device corresponding with first forwarding device.
10. a kind of forwarding device, which is characterized in that including machine readable storage medium and processor, the machine readable storage
Media storage has machine-executable instruction, and the processor promotes the forwarding device when executing the machine-executable instruction
Method described in claim 1-7 any one is realized as the first forwarding device.
11. a kind of repeater system, which is characterized in that including the first forwarding device and the second forwarding device, shown first forwarding is set
Standby cooperate with the second forwarding device realizes method as claimed in claim 9.
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