CN107547371A - A kind of message forwarding method and device - Google Patents
A kind of message forwarding method and device Download PDFInfo
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- CN107547371A CN107547371A CN201710896156.6A CN201710896156A CN107547371A CN 107547371 A CN107547371 A CN 107547371A CN 201710896156 A CN201710896156 A CN 201710896156A CN 107547371 A CN107547371 A CN 107547371A
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Abstract
The present invention provides a kind of message forwarding method and device, and applied to the node in SR networks, this method includes：When getting the MPLS messages for being packaged with main label stack and standby label stack, the state of link corresponding to the stack top label of the main label stack is determined, wherein, the label that the main label stack includes is adjacent label；The label that the standby label stack includes is the node label of purpose node；When the state of the link is malfunction, the main label stack is deleted, the MPLS messages are forwarded based on the standby label stack.By the invention can ensure that the reliability that message forwards, meanwhile, trouble shooting is reduced to the resource occupation of node.
Description
Technical field
The present invention relates to network communication technology field, more particularly to a kind of message forwarding method and device.
Background technology
SR (Segment Routing, section route) agreement be MPLS (Multi-Protocol Label Switching,
Multiprotocol label switching) agreement a kind of optimization agreement, also referred to as source-routed protocol.Based on SD-WAN (Software
Defined-Wide Area Network, software definition wide area network) framework SR networks in, controller is responsible for calculating message
Forward-path, and forward-path is converted into corresponding label stack and is handed down to source node, label stack is packaged in message by source node
Head, forwarded to the next node on forward-path, each node on forward-path will according to the label stack of header
Message is forwarded to destination node.
In order to ensure the reliability of message forwarding, controller calculates two forward-paths (main path and standby for message simultaneously
Path), and main label stack and standby label stack are issued to source node respectively based on two forward-paths, meanwhile, start source node
BFD (Bidirectional Forwarding Detection, two-way converting detection) function carries out failure inspection to active and standby path
Survey.When detection main path is normal, main label stack is packaged in header by source node, and message forwards along main path；Work as detection
When main path failure, standby path are normal, standby label stack is packaged in header by source node, and message forwards along standby path.
It is on the increase with the continuous expansion and network application of network size, it is necessary to which the path for carrying out fault detect is got over
Come more, fault detect will take node ample resources, or even the disposal ability beyond node.
The content of the invention
It is an object of the invention to provide a kind of message forwarding method and device, to ensure message forwarding reliability
Meanwhile reduce occupancy of the fault detect to node resource.
For achieving the above object, the invention provides following technical scheme：
On the one hand, the present invention provides a kind of message forwarding method, and applied to the node in SR networks, methods described includes：
When getting the MPLS messages for being packaged with main label stack and standby label stack, the stack top mark of the main label stack is determined
The state of link corresponding to label, wherein, the label that the main label stack includes is adjacent label；The mark that the standby label stack includes
Sign as the node label of purpose node；
When the state of the link is malfunction, the main label stack is deleted, based on the standby label stack forwarding institute
State MPLS messages.
On the other hand, the present invention provides a kind of apparatus for forwarding message, applied to the node in SR networks, described device bag
Include：
Determining unit, for when getting the MPLS messages for being packaged with main label stack and standby label stack, determining the master
The state of link corresponding to the stack top label of label stack, wherein, the label that the main label stack includes is adjacent label；It is described standby
The label that label stack includes is the node label of purpose node；
Retransmission unit, for when the state of the link is malfunction, the main label stack being deleted, based on described standby
Label stack forwards the MPLS messages.
The present invention is equal by active and standby path corresponding label stack (main label stack and standby label stack) it can be seen from above description
It is encapsulated in MPLS messages, and each node carries out fault detect to direct connected link, when any node inspection on main path
When measuring link failure, active and standby path switching can be carried out, to ensure the reliability of message forwarding, simultaneously as node pin
Fault detect is carried out to direct-connected physical link, therefore, reduces occupancy of the fault detect to node resource.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is a kind of schematic diagram of SR networks based on SD-WAN frameworks shown in the embodiment of the present invention；
Fig. 2 is a kind of message forwarding method flow chart shown in the embodiment of the present invention；
Fig. 3 A to Fig. 3 D are the MPLS message encapsulation schematic diagrams shown in the embodiment of the present invention；
Fig. 4 is a kind of structural representation of node shown in the embodiment of the present invention；
Fig. 5 is a kind of structural representation of apparatus for forwarding message shown in the embodiment of the present invention.
Embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Following description is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent and the consistent all embodiments of the present invention.On the contrary, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects being described in detail in claims, of the invention.
It is only merely for the purpose of description specific embodiment in terminology used in the present invention, and is not intended to be limiting the present invention.
It is also intended in " one kind " of the singulative of the invention with used in appended claims, " described " and "the" including majority
Form, unless context clearly shows that other implications.It is also understood that term "and/or" used herein refers to and wrapped
Containing the associated list items purpose of one or more, any or all may be combined.
It will be appreciated that though various information, but this may be described using term first, second, third, etc. in the present invention
A little information should not necessarily be limited by these terms.These terms are only used for same type of information being distinguished from each other out.For example, do not departing from
In the case of the scope of the invention, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as
One information.Depending on linguistic context, word as used in this " if " can be construed to " ... when " or " when ...
When " or " in response to determining ".
The embodiment of the present invention proposes a kind of message forwarding method, and main label stack and standby label stack are packaged in by this method simultaneously
In MPLS messages, when link failure corresponding to the nodal test to main path on main path, main label stack is deleted, based on standby mark
Sign stack forwarding MPLS messages.
It is a kind of SR network diagrams based on SD-WAN frameworks shown in the embodiment of the present invention referring to Fig. 1.The SR networks
Including controller Controller, 1~R6 of node R, wherein, the numeral in round parentheses represents node label, for unique mark
Corresponding node；Numeral in square brackets represents adjacent label, for identifying the link between adjacent node.The present invention is not to SR nets
Number of nodes in network is limited.
It is one embodiment flow chart of message forwarding method of the present invention referring to Fig. 2, the embodiment is from SR nodes
Angle message repeating process is described.
Step 201, when getting the MPLS messages for being packaged with main label stack and standby label stack, the main label stack is determined
Stack top label corresponding to link state.
In SD-WAN frameworks, controller can be according to specific business demand (for example, the significance level of business, bandwidth, speed
Rate etc.) preferred path that forwarding corresponds to the SR tunnels of service message is calculated, the preferred path being calculated is converted into SR labels
Stack is issued on the SR tunnels of source node, to instruct to be forwarded to destination node by the service message that the SR tunnels forward.
In the embodiment of the present invention, controller issues two label stacks to the SR tunnels of source node, and one is main label stack, and one
Individual is standby label stack, wherein, main label stack is corresponding to the preferred path (being designated as main path) in the SR tunnels that controller calculates
Label stack, label in the main label stack are the adjoining label that is passed through along main path；The standby corresponding standby path of label stack, standby label
Label in stack is the node label of purpose node.For example, controller Controller is to be turned by source node R1 T1 tunnels
It is R1 → R2 → R6 → R5 → R4 to be sent to the preferred path that R4 message calculates, then the master that controller Controller issues to R1
Label stack is { 102,206,605,504 }, i.e., using adjacent label corresponding to the link between the adjacent node passed through successively come
Represent main path；Standby label stack is { 4 }, i.e., represents standby path using the node label of the destination node of message forwarding.
Source node is received after controller is issued to main label stack and the standby label stack in SR tunnels, utilizes main label stack and standby
Label stack is packaged to the service message forwarded by SR tunnels, the MPLS messages after being encapsulated, wherein, main label stack is
The outermost layer label stack of MPLS messages, standby label stack is the next label stack adjacent with main label stack.
Any node including source node, it is packaged with main label stack and the MPLS messages for label stack when getting
When, the stack top label based on main label stack determines the state of the stack top label respective links, specifically, corresponding to chain to stack top label
Road carries out BFD inspections (physical link detection of connectivity), if respective links are not checked by BFD, it is determined that Link State is event
Barrier state；If respective links are checked by BFD, it is determined that Link State is normal condition.
For example, the stack top label that R1 obtains the main label stack of current MPLS messages is 102, then to the adjacent correspondence of label 102
Link (physical link between R1 and R2) carries out BFD detections, if being detected by BFD, it is determined that the link between R1 and R2 is just
Often, R1 removes stack top label 102, and MPLS messages are forwarded along the adjacent respective links of label 102；After R2 receives MPLS messages, obtain
The stack top label for taking the main label stack of MPLS messages is 206, then to the adjacent respective links (physics between R1 and R6 of label 206
Link) BFD detections are carried out, if not detected by BFD, it is determined that the link failure between R2 and R6, perform step 202.
It should be added that the present invention be directed to carry out BFD detections with the direct-connected physical link of node, relative to existing
There is the BFD in technology for logical path to detect, the quantity of BFD detections can be substantially reduced.In addition, the present invention does not detect to BFD
Time point limited, for example, also can periodically to physical link carry out BFD detections.
Step 202, when the state of the link is malfunction, the main label stack is deleted, based on the standby label
Stack forwards the MPLS messages.
For example, R2 when detecting the link failure between R2 and R6, deletes main label stack, that is, delete in MPLS messages
Adjacent label 206,605,504, only retains standby label stack, i.e. destination node R4 node label 4, R2 and subsequent node is based on
Node label is according to routing forwarding MPLS messages, until destination node R4.It can be seen from the above description that the present invention will be active and standby
Path corresponding label stack (main label stack and standby label stack) is encapsulated in MPLS messages, and each node is to direct connected link
Fault detect is carried out, when any node on main path detects link failure, can carry out active and standby path switching, to protect
The reliability of message forwarding is demonstrate,proved, simultaneously as node carries out fault detect just for direct-connected physical link, therefore, reduces event
Occupancy of the barrier detection to node resource.
Now still by taking SR networks shown in Fig. 1 as an example, message repeating process is discussed in detail.
The service message that controller Controller is forwarded to destination node R4 to the T1 tunnels by source node R1 calculates
The preferred path (being designated as Path1) in T1 tunnels, if Path1 is R1 → R2 → R6 → R5 → R4, it is converted into label stack (being designated as S1)
For { 102,206,605,504 }；Using destination node R4 node label 4 as standby label stack (being designated as S2), i.e. S2 is { 4 }.
S1 and S2 are issued on R1 tunnel T1 by Controller.
When R1 receives service message (being designated as Packet1) for belonging to tunnel T1, Packet1 is carried out using S1 and S2
Encapsulation obtains corresponding MPLS messages (being designated as MPLS1).Wherein, S1 is MPLS1 outermost layer label stack, and S2 is adjacent with S1
Next label stack, as shown in Figure 3A.R1 detects the connectedness of stack top label (outermost layer label) 102 respective links, if the link
Normally, then R1 deletes label 102, and now, S1 is { 206,605,504 }, and the MPLS messages after deleting label 102 (are designated as by R1
MPLS2, as shown in Figure 3 B) forwarded by the link being connected with R2.
After R2 receives MPLS2, the connectedness of the respective links of detection stack top label 206, if the link is normal, R2 is deleted
Label 206, now, S1 is { 605,504 }, and R2 is by the MPLS messages (being designated as MPLS3, as shown in Figure 3 C) after deleting label 206
Forwarded by the link being connected with R6.
After R6 receives MPLS3, the connectedness of the respective links of detection stack top label 605, if the link failure, R6 is deleted
Label stack S1, that is, label 605,504 is deleted, retain S2, that is, retain destination node R4 node label 4, obtain as shown in Figure 3 D
MPLS4.R6 be based on node label 4 according to routing forwarding MPLS4, it is assumed that route next jump node label be 3, then R6 by with
The link forwarding MPLS4 of R3 (node label 3) connections.
After R3 receives MPLS4, because R4 (node label 4) is direct-connected with oneself, therefore, deletion of node label 4 will
Packet1 is transmitted to R4 by the link being connected with R4.
I.e. Packet1 forward-path switches to R1 → R2 → R6 → R3 → R4 by R1 → R2 → R6 → R5 → R4, ensures
The normal forwarding of message.
Corresponding with the embodiment of foregoing message forwarding method, present invention also offers the embodiment of apparatus for forwarding message.
The embodiment of apparatus for forwarding message of the present invention can be applied on node.Device embodiment can be real by software
It is existing, it can also be realized by way of hardware or software and hardware combining.Exemplified by implemented in software, as on a logical meaning
Device, it is that corresponding computer program instructions are formed in the processor run memory by equipment where it.From hardware layer
For face, as shown in figure 4, being a kind of hardware structure diagram of apparatus for forwarding message of the present invention place equipment, except the place shown in Fig. 4
Manage outside device and nonvolatile memory, the equipment in embodiment where device is gone back generally according to the actual functional capability of the equipment
Other hardware can be included, this is repeated no more.
Fig. 5 is refer to, is the structural representation of the apparatus for forwarding message in one embodiment of the invention.Message forwarding dress
Put including determining unit 501 and retransmission unit 502, wherein：
Determining unit 501, for when getting the MPLS messages for being packaged with main label stack and standby label stack, it is determined that described
The state of link corresponding to the stack top label of main label stack, wherein, the label that the main label stack includes is adjacent label；It is described
The label that standby label stack includes is the node label of purpose node；
Retransmission unit 502, for when the state of the link is malfunction, the main label stack being deleted, based on institute
State standby label stack and forward the MPLS messages.
Further, when the node is source node, described device also includes：
Encapsulation unit, for receive controller be issued to the source node SR tunnels main label stack and standby label
During stack, the service message forwarded by the SR tunnels is packaged using the main label stack and the standby label stack, obtained
To the MPLS messages.
Further, the main label stack be the MPLS messages outermost layer label stack, the standby label stack for institute
State the adjacent next label stack of main label stack.
Further,
The determining unit 501, specifically for carrying out two-way converting detection BFD inspections to link corresponding to the stack top label
Look into；If the link is not checked by the BFD, it is determined that the state of the link is malfunction.
The function of unit and the implementation process of effect specifically refer to and step are corresponded in the above method in said apparatus
Implementation process, it will not be repeated here.
For device embodiment, because it corresponds essentially to embodiment of the method, so related part is real referring to method
Apply the part explanation of example.Device embodiment described above is only schematical, wherein described be used as separating component
The unit of explanation can be or may not be physically separate, can be as the part that unit is shown or can also
It is not physical location, you can with positioned at a place, or can also be distributed on multiple NEs.Can be according to reality
Need to select some or all of module therein to realize the purpose of the present invention program.Those of ordinary skill in the art are not paying
In the case of going out creative work, you can to understand and implement.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God any modification, equivalent substitution and improvements done etc., should be included within the scope of protection of the invention with principle.
Claims (8)
1. a kind of message forwarding method, it route the node in SR networks applied to section, it is characterised in that methods described includes：
When getting the multiprotocol label switching MPLS messages for being packaged with main label stack and standby label stack, the main label is determined
The state of link corresponding to the stack top label of stack, wherein, the label that the main label stack includes is adjacent label；The standby label
The label that stack includes is the node label of purpose node；
When the state of the link is malfunction, the main label stack is deleted, based on described in the standby label stack forwarding
MPLS messages.
2. the method as described in claim 1, it is characterised in that described to determine the principal mark when the node is source node
Before signing the state of link corresponding to the stack top label of stack, in addition to：
Receive controller be issued to the source node SR tunnels main label stack and during standby label stack, utilize the principal mark
Label stack and the standby label stack are packaged to the service message forwarded by the SR tunnels, obtain the MPLS messages.
3. method as claimed in claim 2, it is characterised in that：
The main label stack is the outermost layer label stack of the MPLS messages, and the standby label stack is adjacent with the main label stack
Next label stack.
4. the method as described in claim 1, it is characterised in that chain corresponding to the stack top label for determining the main label stack
The state on road, including：
Two-way converting detection BFD is carried out to link corresponding to the stack top label to check；
If the link is not checked by the BFD, it is determined that the state of the link is malfunction.
5. a kind of apparatus for forwarding message, it route the node in SR networks applied to section, it is characterised in that described device includes：
Determining unit, for when getting the multiprotocol label switching MPLS messages for being packaged with main label stack and standby label stack,
The state of link corresponding to the stack top label of the main label stack is determined, wherein, the label that the main label stack includes is adjoining
Label；The label that the standby label stack includes is the node label of purpose node；
Retransmission unit, for when the state of the link is malfunction, deleting the main label stack, based on the standby label
Stack forwards the MPLS messages.
6. device as claimed in claim 5, it is characterised in that when the node is source node, described device also includes：
Encapsulation unit, for receive controller be issued to the source node SR tunnels main label stack and standby label stack
When, the service message forwarded by the SR tunnels is packaged using the main label stack and the standby label stack, obtained
The MPLS messages.
7. device as claimed in claim 6, it is characterised in that：
The main label stack is the outermost layer label stack of the MPLS messages, and the standby label stack is adjacent with the main label stack
Next label stack.
8. device as claimed in claim 5, it is characterised in that：
The determining unit, checked specifically for carrying out two-way converting detection BFD to link corresponding to the stack top label；If institute
State link not check by the BFD, it is determined that the state of the link is malfunction.
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| CN108809732A (en) * | 2018-06-29 | 2018-11-13 | 广东工业大学 | A kind of software definition metropolitan area network control system |
| CN109167700A (en) * | 2018-08-21 | 2019-01-08 | 新华三技术有限公司 | The detection method and device in the section routing tunnel SR |
| WO2020001309A1 (en) * | 2018-06-30 | 2020-01-02 | 华为技术有限公司 | Method for processing transmission path failure, apparatus, and system |
| CN110838978A (en) * | 2018-08-15 | 2020-02-25 | 迈普通信技术股份有限公司 | Message forwarding method and device |
| CN110971626A (en) * | 2018-09-28 | 2020-04-07 | 贵州白山云科技股份有限公司 | Enterprise branch office access request processing method, device and system |
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| CN108768788A (en) * | 2018-06-26 | 2018-11-06 | 新华三技术有限公司合肥分公司 | Path failure detection method and device |
| CN108809732A (en) * | 2018-06-29 | 2018-11-13 | 广东工业大学 | A kind of software definition metropolitan area network control system |
| CN108809732B (en) * | 2018-06-29 | 2021-08-03 | 广东工业大学 | Software defined metropolitan area network control system |
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| CN109167700A (en) * | 2018-08-21 | 2019-01-08 | 新华三技术有限公司 | The detection method and device in the section routing tunnel SR |
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| WO2021233168A1 (en) * | 2020-05-19 | 2021-11-25 | 华为技术有限公司 | Method and device for sending packet |
| WO2022052201A1 (en) * | 2020-09-14 | 2022-03-17 | 网络通信与安全紫金山实验室 | Esp-based encapsulated message implementing source routing in overlay layer and transmission method therefor |
| WO2022143373A1 (en) * | 2020-12-28 | 2022-07-07 | 华为技术有限公司 | Communication method and node |
| CN113691447A (en) * | 2021-08-23 | 2021-11-23 | 烽火通信科技股份有限公司 | SR local micro-ring prevention method and device |
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