CN106817273A - For the method and apparatus of L3VPN business diagnosis - Google Patents
For the method and apparatus of L3VPN business diagnosis Download PDFInfo
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- CN106817273A CN106817273A CN201510864379.5A CN201510864379A CN106817273A CN 106817273 A CN106817273 A CN 106817273A CN 201510864379 A CN201510864379 A CN 201510864379A CN 106817273 A CN106817273 A CN 106817273A
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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
- H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
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Abstract
The invention discloses a kind of method and apparatus for the diagnosis of L3VPN business.The device is located in a PE, including：Construction unit, it is configured as building L3VPN business response request message；Transmitting element, it is configured as sending the L3VPN business response request message to the 2nd PE；And receiving unit, it is configured as receiving the L3VPN business response response message from the 2nd PE；Wherein, the L3VPN business responds request message includes target service entity TLV, and the L3VPN Business Entities that the L3VPN business responds request message should be responded for specifying.
Description
Technical field
The present invention relates to the communications field, more specifically, it is related to a kind of for L3VPN business
The method and apparatus of diagnosis.
Background technology
Currently, it is existing to be used for the Virtual Private Network of diagnostic horizon 3 (L3 Virtual Private
Network, L3VPN) business instrument include RFC 4379 in defined tag changeable path
In footpath (Label Switch Path, LSP) Ping/ route tracing utilities, or RFC 5085
Virtual Circuit Connectivity checking (the Virtual Circuit Connectivity of defined
Verification, VCCV) tradition applied in instrument, or the context of L3VPN examples
IP Ping/ route tracing utilities.Although each can be used for diagnosing the one of L3VPN business
A little aspects, but they are all not enough to diagnose all main aspects of L3VPN business：L3VPN
The state of Business Entity, service label allocation model and the industry for the distribution of L3VPN Business Entities
The sum of business label and the data path of L3VPN traffic packets.
Here, the data path of L3VPN traffic packets refers to all participation L3VPN of traversal
The service node of business, does not consider to be not involved in all nodes of business.That is, only transporting
Row L3VPN Business Entities and terminate service label Provider Edge (Provider Edge,
PE) node is seen as L3VPN service nodes, general operator (Provider, P)
Node is not qualified as L3VPN service nodes.
For LSP Ping/ route tracing utilities, LSP responds the mesh of request/response message
Mark is MPLS label stack.If MPLS label stack includes service label, service label
Binding can be identified.However, LSP Ping/ route tracing utilities can not diagnose L3VPN industry
Entity.
For VCCV instruments, current VCCV instruments have specified some to be used for
ICMP (Internet Control Message Protocol, ICMP) Ping,
LSP Ping and two-way converting detection (Bidirectional Forwarding Detection, BFD)
Connection confirm (Connectivity Verification, CV) type, but they are not yet
It is suitable for diagnosing L3VPN Business Entities.
IP Ping/ route tracing utilities can be used for verifying IP main frames in L3VPN environment
Accessibility and path, but it is transparent for bottom MPLS label.Therefore IP Ping/
Route tracing utility can not be used for diagnosing all main aspects of L3VPN business.
As can be seen that VPN traffic entity is also verified without appropriate diagnostic tool so far
Integrality and based on RFC 4364 Border Gateway Protocol (Border Gateway Protocol,
BGP)/multiprotocol label switching (Multi-Protocol Label Switching, MPLS) IP VPN
The data path of the traffic packets of business.
The content of the invention
For problem above, the present invention proposes a kind of for comprehensively carrying out L3VPN business
The scheme of diagnosis.More specifically, the present invention proposes two kinds of diagnostic tools：L3VPN industry
Business Ping instruments and L3VPN business route tracing utilities, and for both instruments are fixed respectively
Justice diagnostic message newly, i.e. L3VPN business responds (Echo) request message and L3VPN
Business responds response message.Wherein, when being applied to PE in L3VPN Business Entity environment
When upper, L3VPN business Ping instruments can be used to verify L3VPN business all or one
The availability of specific L3VPN Business Entities, and return corresponding PE system address (with
And other service related informations), and L3VPN business route tracing utilities can be used for disclosing
Lead to all or all possible data path for specific L3VPN Business Entities, i.e.
Reach by all L3VPN service nodes on the path of the L3VPN Business Entities of route tracking
System address.
According to the first aspect of the invention, there is provided it is a kind of for L3VPN business diagnosis
Method, methods described includes the following steps performed by a PE：L3VPN business is built to return
Answer request message；The L3VPN business is sent to the 2nd PE respond request message；And connect
Receive the L3VPN business from the 2nd PE and respond response message；Wherein, the L3VPN
Business responds request message includes target service entity TLV, for specify should respond it is described
L3VPN business responds the L3VPN Business Entities of request message.
According to the second aspect of the invention, there is provided it is a kind of for L3VPN business diagnosis
Method, methods described includes the following steps performed by the 2nd PE：Receive and come from a PE
L3VPN business respond request message, the L3VPN business responds request message includes mesh
Mark L3VPN Business Entity TLV, the L3VPN business response should be responded for specifying
The L3VPN Business Entities of request message；Determine that the L3VPN business responds request message
Target is all L3VPN Business Entities or a specific L3VPN Business Entity；Work as institute
It is described when the target for stating L3VPN business response request message is all L3VPN Business Entities
2nd PE returns to L3VPN business and responds response message to a PE, updates described
L3VPN business responds request message and forwards the L3VPN business after updating to respond request and disappears
Breath；And when the target that the L3VPN business responds request message is one specific
L3VPN Business Entities and when the 2nd PE is the specific L3VPN Business Entities,
2nd PE returns to L3VPN business and responds response message to a PE.
According to the third aspect of the present invention, there is provided it is a kind of for L3VPN business diagnosis
Device, the device is located in a PE, including：Construction unit, it is configured as building L3VPN
Business responds request message；Transmitting element, it is configured as sending the L3VPN to the 2nd PE
Business responds request message；And receiving unit, it is configured as receiving from described second
The L3VPN business of PE responds response message；Wherein, the L3VPN business responds request
Message includes target service entity TLV, and the L3VPN business time should be responded for specifying
Answer the L3VPN Business Entities of request message.
According to the fourth aspect of the present invention, there is provided it is a kind of for L3VPN business diagnosis
Device, described device is located in the 2nd PE, including：Receiving unit, it is configured as receiving
L3VPN business from a PE responds request message, and the L3VPN business is responded please
Seeking message includes target L3VPN Business Entity TLV, for specify should respond it is described
L3VPN business responds the L3VPN Business Entities of request message；Determining unit, it is configured
To determine that the target that the L3VPN business responds request message is all L3VPN Business Entities
Or a specific L3VPN Business Entity；And processing unit, it is configured as institute
When the target for stating L3VPN business response request message is all L3VPN Business Entities, to institute
State a PE and return to L3VPN business response response message, update the L3VPN business and return
Answer request message and forward the L3VPN business after updating to respond request message；And work as institute
State L3VPN business respond request message target be a specific L3VPN Business Entity simultaneously
And the 2nd PE is when being the specific L3VPN Business Entities, returned to a PE
L3VPN business responds response message.
Brief description of the drawings
By the description below with reference to the specific embodiment of the invention given by drawings below
Afterwards, be better understood with the present invention, and other objects of the present invention, details, feature and
Advantage will become apparent.In the accompanying drawings：
Fig. 1 shows the general deployment mould of the BGP/MPLS L3VPN based on RFC 4364
The schematic diagram of type；
Fig. 2 shows the signal of the operation of L3VPN business Ping instruments of the invention
Figure；
Fig. 3 shows the operation of L3VPN business route tracing utility of the invention
Schematic diagram；
Fig. 4 shows that L3VPN business of the invention responds request with response message
The schematic diagram of form；
Fig. 5 is shown in L3VPN business response request of the invention and response message
TLV and son-TLV fields form schematic diagram；
Fig. 6 A and Fig. 6 B respectively illustrate the L3VPN for L3VPN business Ping instruments
Business responds request message and L3VPN business responds the schematic diagram of response message；
Fig. 7 A and Fig. 7 B are respectively illustrated for L3VPN business route tracing utilities
L3VPN business responds request message and L3VPN business responds the schematic diagram of response message；
Fig. 8 shows the square frame of the device for the diagnosis of L3VPN business of the invention
Figure；
Fig. 9 shows another device for the diagnosis of L3VPN business of the invention
Block diagram.
Specific embodiment
The preferred embodiment of the present invention is more fully described below with reference to accompanying drawings.Although attached
The preferred embodiment of the present invention is shown in figure, however, it is to be appreciated that can be in a variety of manners
Realize the present invention without that should be limited by embodiments set forth herein.Conversely, there is provided these realities
The mode of applying be in order that the present invention is more thorough and complete, and can be complete by the scope of the present invention
Whole conveys to those skilled in the art.
Before basic thought of the invention is described, L3VPN business models are first looked back to introduce
The necessary concept of some of and term.Fig. 1 shows the BGP/MPLS based on RFC 4364
The schematic diagram of the general deployment model of L3VPN.
Generally, distributed L3VPN business can be seen as one group of virtual flow-line and forwarding
(Virtual Routing and Forwarding, VRF) example, it passes through business between VRF
Transmitting path is interconnected.L3VPN topology by export (Export) route target (Route Target,
RT) controlled with the setting of input (Import) RT, wherein output RT is bgp protocol
The extended community attribute of the L3VPN routes distributed, and be input into RT and then control each VRF
The L3VPN of input is allowed to route, this further determines whether VRF should be input
L3VPN routes are re-distributed to other reciprocity VRF.L3VPN routes redistribution rule can be with
Described by the concept of horizontal segmentation group (Split Horizon Group).Industry between VRF
Business transmitting path (or equivalently, L3VPN business equity end) multiple can be grouped into
The L3VPN of input will not be route redistribution to same level by horizontal segmentation group, VRF
Other business equity end in segmentation group, and always the L3VPN route redistributions of input are arrived
Other business equity end in varying level segmentation group.How business between a VRF is transmitted
Path (or a L3VPN business equity end) is assigned to the rule of specific horizontal segmentation group
Value only by being input into RT and output RT determines.Due to the rule (or algorithm) be not it is new,
Therefore the present invention will not be described in detail, and be just assumed that each VRF and one or more automatic wounds
The horizontal segmentation group built is associated, and the topology of L3VPN business is controlled by these horizontal segmentation groups
System, and business transmitting path (or each L3VPN business equity end) between every VRF
Clearly belong to a horizontal segmentation group.The related horizontal segmentation of the topological sum of L3VPN business
Group is as shown in fig. 1.
Note, herein, based on context, horizontal segmentation group can refer to business transmission path
Footpath group or L3VPN business peer-groups.
Assuming that the topology (or two-way L3VPN route distributions path) of L3VPN business
The control of the horizontal segmentation group by being associated with VRF, invention proposes two kinds of L3VPN industry
Business diagnostic tool：L3VPN business Ping instruments and L3VPN business route tracing utilities, and
And describe the message coding of correlation and realize algorithm.
It is proposed that being L3VPN business Ping instruments and L3VPN business route tracking work
Tool defines two kinds of message：L3VPN business responds request message and L3VPN business responds response
Message.These message are by UDP (User Datagram Protocol, UDP)
Packet bearer, UDP port number can be manually configured on each PE, or can be by mutual
Networking number assignment mechanism (Internet Assigned Numbers Authority, IANA) point
Match somebody with somebody.
Note：The present invention is that same inventor diagnoses for layer 2VPN (L2VPN) business
The extension of the application No.2015100804040 of proposition, therefore the message before its partial reuse
Coding and algorithm.However, due to the characteristics of L2VPN and L3VPN have respective, e.g.
It is no based on route etc., therefore the two is suitable for the solution of different application scene.
L3VPN business responds request message and L3VPN business is responded response message and can be taken
Band all kinds-Length Value (Type-Length-Value, TLV) for various purposes.This
Invention suggestion reuse before for L2VPN two kinds of TLV and define two kinds it is new only
Suitable for the TLV of L3VPN business Ping/ route tracking：
1) target L3VPN Business Entities TLV, it specifies and should respond to L3VPN industry
The L3VPN Business Entities of request message are responded in business.The present invention is target L3VPN Business Entities
Define two values：All L3VPN Business Entities and a specific L3VPN Business Entity
(for example, can be known by the IPv4 addresses for running the PE of the specific L3VPN Business Entities
Not).
2) route tracking TLV, it encodes L3VPN business request informations from originating PE
To the system address for terminating all PE that PE is traveled through.Route tracking TLV will be in L3VPN
Originating PE is sent back in business response message.
3) service label allocation model TLV, it indicates how PE is L3VPN business realities
Body distributes service label.According to RFC 4364, PE can select to distribute single for whole VRF
Individual service label, a service label is distributed for each direct-connected circuit, is each IP routes point
Service label can be distributed with a service label, or PE using other specific process.
The present invention defines the new TLV and comes from distal end L3VPN Business Entity inquiry businesses label distribution
Pattern.
4) allocated service label number TLV, it is the distribution of L3VPN entities to PE
Service label number is encoded.Come from distal end L3VPN industry invention defines the new TLV
Entity inquires about allocated service label number.
Fig. 2 shows the signal of the operation of L3VPN business Ping instruments of the invention
Figure.Fig. 3 shows showing for the operation of L3VPN business route tracing utility of the invention
It is intended to.
L3VPN business Ping instruments and L3VPN business route tracing utilities can be implemented as
Command line interface (CLI) is ordered, and is adjusted from the cli interface of the PE for participating in L3VPN business
Use them.Fig. 2 and Fig. 3 show CLI screens and L3VPN business diagnostic messages in industry
Propagation in business transmitting path.
As shown in Figures 2 and 3, band arrow solid line represents that L3VPN business is responded request and disappeared
The transmitting path of breath, wherein L3VPN business are responded request message and are initiated by node 10.1.1.1,
Destination node is 10.1.2.3, is arrived along the data path of the broadcast packe in L3VPN business domains
Up to all L3VPN Business Entities.
The present invention is the extension of previous invention, and the total of suggestion disappears during it has reused previous invention
Breath coded format and define necessary new extension (two kinds of new type of messages, four kinds it is new
Specific to the wrong subcode of business and two kinds of new TLV) supporting L3VPN business
The operation of Ping and route tracing utility.
Message encoding format and its field described below, previous invention has been defined and this hair
The new definition of bright suggestion is suitably marked.
L3VPN business responds request and response message and is grouped carrying by UDP.Udp port
Number can be distributed by IANA, or be locally configured on the PE that can be participated at each.
Fig. 4 shows that L3VPN business of the invention responds the lattice of request and response message
The schematic diagram of formula.Wherein, both message are present in the form of UDP packet load,
It is identical with previous invention.
For the integrality of document, the definition of field has been redescribed here.Note, below
Definition part it is identical with what is defined before, all L2VPN in previous invention are changed to
More appropriate term (such as L3VPN).Although message format is constant, it is proposed that
It is only applicable to new type of message, the new spy of L3VPN business Ping/ route tracking applications
Due to the error code and new TLV of business.
Version number：The version number of message format.In the present invention, version number could be arranged to
1 it is not limited to 1.
Life span (Time To Live, TTL)：For indicating to allow L3VPN business
Respond the maximum quantity (or hop count) of the L3VPN Business Entities that request or response message are passed through.
If the value of the field is reduced to zero, it is necessary that the L3VPN business responds request/response message
It is dropped and terminates forwarding.After each jump of L3VPN Business Entities, the value of the field must
Must subtract 1.Even if its purpose is to ensure there are two layers in the topology of L3VPN business domains
Broadcast loops (note：L 2 broadcast loop is usual as caused by incorrect business configuration, just
Should be avoided in the case of often) in the case of, L3VPN business response request/response message also can
Forwarding finally will be moved to end.The maximum of TTL is 255, it means that diagnostic message should be by
Travel to L3VPN Business Entities as far as possible.The minimum value of TTL is 1, it means that
The diagnostic message should not be propagated and (noted beyond the adjacent hop distance of L3VPN business entity one：
IP also includes ttl field, but it responds request/response message with L3VPN business
Ttl field implication is different, therefore can not obscure).
Retain：Untapped field, the field can be arranged to 0.
Type of message：The type of the field identification business diagnostic message.Except in previous invention
Outside the value of message types of definition, invention also defines two kinds of new values of message types：
The diagnostic message type of table 1
| Value | Implication |
| 3 | L3VPN business responds request message |
| 4 | L3VPN business responds response message |
Note：It is that L2VPN business responds request message and response message in previous invention
Type of message 1 and type 2 are defined, the present invention extends the species of type of message, for
L3VPN business is diagnosed.
Answer-mode：The field indicates the business response response that long-range PE sends back response to disappear
The return path of breath.The present invention is determined in reusing previous invention by the diagnosis of L2VPN business
The existing answer-mode of justice.For example, answer-mode=1 represents passes through IPv4UDP packet acknowledgments.
Generally, L3VPN business should be sufficiently used for based on the answer-mode value of IPv4UDP packets to examine
It is disconnected.If needing other answer-modes under special circumstances, the value can extend.Although this
Invention define only an answer-mode value, it will be appreciated by those skilled in the art that response
Mode value is not limited to that any suitable answer-mode value each falls within the scope of the present invention.
General error code：In the field, long-range PE returns to general error code, its
Suitable for all types of Business Entities.The present invention has reused and as shown in table 2 has been
The existing general error code of L2VPN business diagnosis definition.Those skilled in the art should
Understand, the general error code in table 2 can extend according to actual needs.
The general error code of table 2
| Value | Implication |
| 0 | There is no mistake |
| 1 | Version number does not support |
| 2 | Type of message is not supported |
| 3 | Answer-mode is not supported |
| 4 | Receive the message of TTL=0 |
| 5 | TLV format errors |
| 6 | Common message format mistake |
| 7 | Specific to the mistake of business |
Specific to the wrong subcode of business：In the field, long-range PE is returned specific to industry
The error code of business, it is only applicable to specific Business Entity type.For L3VPN business
Diagnosis, it is as described below (to note invention defines the new wrong subcode specific to business：
The following wrong subcode specific to business is only applicable to the response request/response of L3VPN business and disappears
Breath, i.e. type of message=3 or 4).
Wrong subcode of the table 3 specific to business
The handle of sender：The field is filled out by the sender that L3VPN business responds request message
Fill, recipient without any changes, responds in L3VPN business and returned as former state in response message.
Sender can match response and request message using the value of this field.
Sequence number：The field is arbitrarily set by the sender that L3VPN business responds request message
It is fixed, can be used to detect the response message lost.
Send timestamp：The field is the root when L3VPN business response request message is sent
According to the date-time of the clock of sender, its form for example can be NTP
(Network Time Protocol, NTP) form.
Receive timestamp：The field be when receive L3VPN business respond request message when,
The date-time of the clock according to recipient, its form can also be NTP forms.
TLV：Fig. 5 shows that L3VPN business of the invention responds request and response disappears
The schematic diagram of the form of TLV and son-TLV fields in breath.The type of TLV is defined as below.
Wherein, length is the length of the Value field, is represented with octet.The Value field depends on class
Type, to its zero padding with so that 4 borders of octet of alignment.TLV can be nested in other
In TLV, in this case, the TLV being nested is referred to as sub- TLV.Sub- TLV has
Separate type and 4 octets that must also align.
Table 3 lists the top TLV for L3VPN business diagnostic messages, as follows：
Table 3 is used for the top TLV of L3VPN business diagnostic messages
| Type | Implication |
| 1 | Target L3VPN Business Entities // reused defined in previous invention |
| 3 | Route tracks // has reused the TLV defined in previous invention |
| 4 | New definition in service label allocation model // present invention |
| 5 | New definition in the service label number // present invention of distribution |
Explanation is needed exist for, the top TLV 1,2,3, this hair defined in previous invention
It is bright to have reused existing top TLV 1 and 3, and define two new top TLV 4 and 5.
Top TLV2 is generally unsuitable for L3VPN business diagnostic tools, therefore not shown in table.
Hereinafter, respectively to (including the reuse and new definition) TLV used in the present invention
It is introduced.
Target service entity TLV (TLV1)
The value of target service entity TLV is the sub- TLV as defined in table 4 below：
The target service entity TLV of table 4
Target service entity is that L3VPN business responds the TLV that must have in request message.
Route tracking TLV (TLV3)
Route tracking TLV is an optional TLV, and it is for tracking L3VPN business
Request message is from originating PE to the path for terminating PE and associated timestamp information.Route
Tracking TLV can be both used in L3VPN response business request informations, can be used in again
L3VPN is responded in response message.The presence of the TLV is used to determine that L3VPN business is responded
Request message is operated for L3VPN business PING or for L3VPN route tracking behaviour
Make.
The value of route tracking TLV is the sub- TLV as defined in table 5 below：
The route tracking of table 5 TLV
| Sub- TLV classes | Length | Value |
| Type 1 | 12 multiple | IPv4 addresses and the pairing list of timestamp |
The Value field is the byte of a row 12, and each includes IPv4 addresses for 4 bytes
The timestamp subitem of item and 8 bytes.IPv4 addresses subitem is used to record reception L3VPN business
The system address of the PE of request message is responded, timestamp subitem connects according to the clock log of PE
Date-time during L3VPN business response response message is received, for example can be with NTP forms.
If originating PE intends activation L3VPN business route tracing utilities, it should be
L3VPN business responds request message includes route tracking TLV, and its value must include IPv4
Address and the pairing of timestamp.IPv4 addresses are the system address of originating PE, and timestamp is to work as
When sending L3VPN business response request message (identical with the transmission timestamp value in Fig. 4)
Date-time, for example can be with NTP forms.Track TLV's with route when receiving
When L3VPN business responds request message, each downstream PE should be by route tracking TLV
It is interior add itself system address and date-time come update L3VPN business respond request message
(and decremented TTL values), the L3VPN industry after then being updated along the forwarding of normal path downstream
Request message is responded in business.
The TLV (TLV4 and TLV5) of new definition of the invention
Service label allocation model TLV (TLV4)
Service label allocation model TLV is an optional TLV, and it can both be used in
L3VPN business is responded in request message, L3VPN business can be used in again and responds response message
In.For example, the length of the TLV can be preset as into 1.Please if L3VPN business is responded
Ask and there is the TLV in message, then its value for example can be 0, represent that initiating PE asks
Response PE Report service label allocation models.Should when PE structure L3VPN business responses are terminated
When answering message, its L3VPN business for being based on entering whether there is business in responding request message
Label allocation model TLV (such as value=0) decides whether to include service label allocation model
TLV.However, it will be understood by those skilled in the art that above-mentioned service label allocation model TLV
The setting of length and value be merely exemplary, for application-specific, it can be carried out not
Same setting.
In the above-described example, the service label allocation model reported for example can be following
A value in table 6：
The service label allocation model TLV of table 6
| Value | Implication |
| 0 | For the request of service label allocation model |
| 1 | PE is that whole VRF distributes a service label |
| 2 | PE distributes a service label for each direct-connected circuit |
| 3 | PE is one service label of each IP route assignment |
| 4 | PE distributes service label using other specific process |
Service label number TLV (TLV5) of distribution
The service label number TLV of distribution is an optional TLV, and it can both be used in
L3VPN business is responded in request message, L3VPN business can be used in again and responds response message
In.In one implementation, if L3VPN business has the TLV in responding request message,
Then its length should be 1, and its value is also 1, and this is represented initiates PE just in request-reply
The service label number of PE report distribution.Disappear when PE structure L3VPN business response responses are terminated
During breath, its L3VPN business for being based on entering whether there is the industry distributed in responding request message
Business number of tags TLV (such as value=0) is come the service label number TLV that decides whether to include to distribute.
However, it will be understood by those skilled in the art that the length of the service label number TLV of above-mentioned distribution
What the setting of degree and value was merely exemplary, for application-specific, it can be carried out different
Set.
In the above-described example, during the service label number of the distribution reported can be table 7 below
The integer value listed：
The service label number TLV of the distribution of table 7
| Value | Implication |
| 0 | For the request of the service label number of distribution |
| Integer | The service label number of distribution |
Below the value of each field and each TLV and its corresponding is given in the form of a list
Implication example.However, it will be understood by those skilled in the art that above-mentioned setting is only to show
Example property, these fields can be rearranged or set by those skilled in the art according to actual needs
Put, or the value of TLV is made into any other different setting, these are without departing from this hair
Bright scope.
The operation of L3VPN business PING and route tracing utility
Fig. 2 shows the signal of the operation of L3VPN business Ping instruments of the invention
Figure, Fig. 3 shows showing for the operation of L3VPN business route tracing utility of the invention
It is intended to.L3VPN business Ping is similar with the operation of route tracing utility.To they two
For person, originating PE sends L3VPN business and responds request message and wait from response PE times
Multiple L3VPN business responds response message.L3VPN business responds request message along broadcast
Packet data path transmission, as long as therefore ttl value is sufficiently large, it can reach L3VPN industry
All PE of pragmatic example.The PE that each is traversed must first check for the L3VPN for entering
Whether the target that business responds request message is directed to oneself, so as to correspondingly operate.If it is not,
The L3VPN business responds request message and is first updated (ttl value decline 1；For L3VPN
Business route tracking, route tracking TLV is added new IPv4 addresses and timestamp information),
The L3VPN Business Entities in all downstreams are then forwarded to (if target is all L3VPN industry
Entity, then stop forwarding after reaching last PE；If target is specific L3VPN
Business Entity, then stop forwarding after reaching specific PE)；Otherwise (i.e. L3VPN industry
Business responds request message and is directed to PE in itself), except updating and forwarding L2VPN business to respond
Request message, PE should also reply L3VPN business and respond request message.Wherein, the TTL
Value is for preventing from endless loop occur in the case of L3VPN topological structure error configurations.
L3VPN business Ping and route tracing utility are responded request and are disappeared using L3VPN business
Breath and L3VPN business respond the different-format of response message.Fig. 6 A and Fig. 6 B are shown respectively
L3VPN business for L3VPN business Ping instruments responds request message and L3VPN
Business responds the schematic diagram of response message.
As shown in Figure 6A and 6B, for the L3VPN of L3VPN business Ping instruments
Business responds request message includes target L3VPN Business Entities TLV (essential) and business
Label allocation model TLV (optional) and service label number TLV (optional) of distribution, and
L3VPN business response response message for L3VPN business Ping instruments includes business mark
Sign service label number TLV (optional) of allocation model TLV (optional) and distribution.
Fig. 7 A and Fig. 7 B are respectively illustrated for L3VPN business route tracing utilities
L3VPN business responds request message and L3VPN business responds the schematic diagram of response message.
As shown in Figure 7A and 7B, for the L3VPN of L3VPN business route tracing utilities
Business respond request message include target L3VPN Business Entities TLV (essential) and route with
Track TLV (essential) and service label allocation model TLV (optional) and the business of distribution
Number of tags TLV (optional), and it is used for the L3VPN of L3VPN business route tracing utilities
Business responds response message includes route tracking TLV (essential) and service label allocation model
TLV (optional) and service label number TLV (optional) of distribution.
L3VPN business responds request message and L3VPN business is responded response message and all sealed
In UDP packets.UDP port number can use manufacturer privately owned (Vendor proprietary)
Value is locally configured on each PE, or discloses distribution to support worldwide interoperability by IANA.
Udp port is referred to as L3VPN business Ping ports in the present invention.
Request packet is responded for L3VPN business, Target IP v4 addresses are arranged to
Any IPv4 addresses in the range of 127/8, the system that source IP v4 addresses are arranged to originating PE
Address.Target UDP port number is arranged to L3VPN business Ping port numbers, source UDP
Port is arbitrarily set by originating PE.Response message is responded for corresponding L3VPN business,
Target IP v4 addresses are arranged to the source that received L3VPN business responds request packet
IPv4 addresses, source IP v4 addresses are arranged to the system address of the PE for carrying out response.Target
UDP port number is arranged to the source UDP that received L3VPN business responds request packet
Port, source UDP port number is arranged to L3VPN business Ping ports.
Carry L3VPN business and respond the diagnosis packet of request message along L3VPN business realities
The acyclic data path of the broadcast packe in example advances to reach in L3VPN srvice instance
All L3VPN entities once and only once.Note, diagnosis packet is in fact tape label
IPv4 packets, MPLS label is allocated to any service label of L3VPN srvice instance,
And IPv4 packets carry the UDP payloads that L3VPN business responds request message.The band
The IPv4 packets of label are transmitted by business transmitting path between VRF, and it can be MPLS LSP
Or generic route encapsulation (Generic Routing Encapsulation, GRE) passage.Just
In the case of often, if operator has been configured with L3VPN traffic performances (i.e., suitably
It is configured with output RT and input RT), the horizontal segmentation group being associated with each VRF should
Do not include loop in the data path of broadcast diagnostics packet.In the L3VPN industry of error configurations
In business, loop is might have in the data path of broadcast diagnostics packet.In order to prevent this not wishing
Endless loop in the case of prestige, each L3VPN business responds request message and is limited to ttl value
(maximum ttl value is 255).
The operation of originating PE
Responding request message and business response response message when above-mentioned L3VPN business is used for
When L3VPN business is diagnosed, originating PE performs following steps：L3VPN business is built to respond
Request message；The L3VPN business is sent to other PE respond request message；Receive and come from it
The L3VPN business of his PE responds response message.Wherein the L3VPN business is responded request and is disappeared
Breath includes target L3VPN Business Entities TLV.In other portions of claim and specification
Point, originating PE is also referred to as a PE sometimes, correspondingly, L3VPN business will be participated in
Other PE in addition to originating PE are also referred to as the 2nd PE.Specifically, retouch in detail below
The operation of originating PE according to embodiments of the present invention is stated.
(1) originating PE builds the L3VPN business to be sent and responds request message.
In one implementation, in constructed L3VPN business responds request message, version
This number can be 1, and type of message=3, answer-mode=1, ttl value comes from the defeated of keeper
Enter.Reserved field, general error code and the error code specific to business both are set to 0.
The message handle of sender is used for matching response and request message, and it can be in a variety of different ways
To set.For example, responding the transmission of request message group when new continuous L3VPN business is sent
When, it can be configured so that a new random number.Sequence number is used for detecting that the response missed disappears
Breath, it is also possible to set in a different manner, for example, there is same sender message when sending
When one group of L3VPN business of handle value responds each continuous meassage in request message, it can
To be arranged to 1,2,3 ....Timestamp is sent to be arranged to send L3VPN business time
Answer the date-time (such as with NTP forms) of request message.Timestamp is received to be set
It is set to 0.
(2) for L3VPN business Ping and route tracing utility, target L3VPN
Business Entity TLV is essential.According to the input of keeper, target service entity TLV
Value can be configured so that Class1-TLV (all Business Entities) or son-TLV of type 2
(a specific transactions entity).
Route tracking TLV is essential for L3VPN business route tracing utilities, but
It is not required for L3VPN business Ping instruments.When keeper calls L3VPN business
During route tracing utility, originating PE must respond request message in L3VPN business includes road
By tracking TLV.Route tracking TLV must only include a pair of IPv4 addresses and timestamp, IPv4
Address is the system address of originating PE, and timestamp is to send L3VPN business to respond request message
Date-time (identical with the value in the transmission timestamp field in Fig. 4).
Service label allocation model TLV and the service label number TLV of distribution are for L3VPN
It is optional for business diagnostic tool.Depending on the input of keeper, L3VPN business is returned
Answering request message can not include including one of which, two or one.
Constructed L3VPN business responds request message and is encapsulated in UDP IPv4 packets
In.However, it will be understood by those skilled in the art that the invention is not limited in this, can be with
Carried using other protocol packets constructed L3VPN business respond request message (and/or
L3VPN business responds response message).
(3) originating PE is by the business equity end to L3VPN srvice instance to be diagnosed
All VRF between business transmitting path respond request sending constructed L3VPN business and disappear
Breath.
When all L3VPN Business Entities are by Ping or by route tracking, own
Participating in the PE of L3VPN business should all reply L3VPN business response response message.For
The specific L3VPN Business Entities of only one of which are by Ping or the situation by route tracking, only spy
Fixed target PE can reply L3VPN business and respond response message, and every other PE is letter
Singly update and forward the L3VPN business to respond request message, without to its response.
If all L3VPN Business Entities in L3VPN business by Ping or route with
Track, then initial TTL value can be configured so that 255 and (or be considered sufficiently large by implementer
Any other numeral).If simply part L3VPN Business Entities by Ping or route with
Track, then ttl value can be set as 1,2,3 ....For example, the L3VPN of TTL=1
Business responds request message and tracks all adjacent (being separated by a jump) Ping or route
L3VPN Business Entities.
When each PE receives tape label from the L3VPN business transmitting paths of any entrance
IPv4 is grouped and the target udp port of IPv4 packets is equal to configured L3VPN business
During Ping ports, the PE must be regarded as the diagnosis packet of L3VPN business.The PE is necessary
First verify that version number, type of message and answer-mode are all correct, and ttl value is not zero.
If any one of above-mentioned checking mistake, PE returns to L3VPN business and responds response point
Group and stop forwarding L3VPN business respond request message, wherein, the L3VPN business return
Answering acknowledgment packet includes corresponding general error code.
If without mistake (therefore type of message must be 3) in message format is input into,
The PE should analyze TLV fields.TLV1 (target service entity) be it is essential, TLV3,
4 or 5 is optional.If having any in the L3VPN business for entering responds request message
TLV (or sub- TLV) format error, then PE must return to (the lattice of general error code 5
Formula mistake TLV) L3VPN business respond and request message and stop forwarding L3VPN industry
Request message is responded in business.
If, all without mistake, PE should verify business mark for message format and TLV forms
The correctness of label, its binding with L3VPN Business Entities (and its associated component) and
The L3VPN Business Entities integralities of itself.If service label not in tag information base or
Person is not associated with any L3VPN Business Entities, then PE must return to the mistake specific to business
By mistake subcode=1 (service label mistake or incorrect be tied to L3VPN srvice instance)
L3VPN business responds acknowledgment packet.If L3VPN Business Entities (or its associated component)
There is any mistake, then PE must return to wrong subcode=2 (the L3VPN business specific to business
Example error) L3VPN business respond acknowledgment packet.If not by defined specific
In business wrong character code cover any other mistake, then PE must return to specific to business
Wrong subcode=3 (general error) L3VPN business respond acknowledgment packet.If there is
Any mistake specific to business, then PE must stop forwarding L3VPN business respond request disappear
Breath.
Demonstrating message format, TLV forms, service label and L3VPN Business Entities
Afterwards, PE can determine the L3VPN srvice instance being diagnosed, and then judge what is entered
L3VPN business responds the target of request message.
When L3VPN business response request message is received, the institute in addition to originating PE
There is the behavior of PE as described below：
If the target that received L3VPN business responds request message is all
L3VPN Business Entities, then：
The PE performs the process that L3VPN business responds response message that returns；
The PE performs the process that L3VPN business responds request message that updates；
The PE performs the process that the L3VPN business after forwarding updates responds request message；
Otherwise, if the target that received L3VPN business responds request message is one specific
L3VPN Business Entities and exactly the PE, then：
The PE performs the process that L3VPN business responds response message that returns；
Otherwise (that is, the L3VPN business for receiving responds the not all L3VPN of target of request message
Business Entity is nor the specific PE), then
The PE performs the process that L3VPN business responds request message that updates；
The PE performs the process that the L3VPN business after forwarding updates responds request message.
In the present invention, after updating L3VPN business response request message, forwarding renewal
L3VPN business responds request message and returns to the process that L3VPN business responds response message
It is as described below：
Update the process that L3VPN business responds request message：
(1) the L3VPN business for making entrance first responds the copy of request message, and right
The copy does following treatment：
Ttl value in the message copy is reduced 1 by PE；
If the message copy is tracked comprising route tracking TLV, the PE in route
Add its system address with the date-time for receiving input message (for example in the end of TLV
With NTP forms).
In this way so that the message copy is changed into the L3VPN business after updating
Respond request message.
L3VPN business after forwarding renewal responds the process of request message：
If the ttl value that the L3VPN business after updating responds request message is zero,
Stop forwarding；
Otherwise, business is transmitted between all VRF that the PE passes through L3VPN srvice instance
Path is sent the L3VPN business after updating in the same mode of broadcast packe and responds request
Message.That is, except belonging to same level segmentation group with the business equity end for entering
VRF between outside business transmitting path, the message after renewal should be by every other
Traffic assignments path is (by industry between all VRF for belonging to varying level segmentation group between VRF
Business transmitting path) it is transmitted.
Note：Repeating process will stop in following any one situation：A () ttl value subtracts
It is small to 0；B () L3VPN business responds the PE that request message reaches most downstream.
Return to the process that L3VPN business responds response message：
(1) PE builds the L3VPN business to be sent and responds response message.Realized in one kind
In, in constructed L3VPN business responds response message, version number=1, type of message=
4.L3VPN business does not use TTL and answer-mode in responding response message, can be set
It is set to 0.The handle of sender, sequence number and to send timestamp be all from the L3VPN for entering
Replicated in business response request message.Timestamp field is received by receiving the L3VPN of entrance
The date-time (such as with NTP forms) that business responds request message is filled.
(2) if the L3VPN business for entering responds request message and do not include that route is tracked
TLV (i.e. for the situation of L3VPN business Ping), then the PE should be according to entrance
L3VPN business responds whether request message includes service label allocation model TLV (value=0)
And/or distribution service label number TLV (value=0) come build with zero, one or two
The L3VPN business of TLV responds response message.For L3VPN business Ping situations, PE
The L3VPN business of structure responds response message should not include route tracking TLV.
Otherwise, if the L3VPN business for entering responds request message and includes route tracking TLV
(i.e. for the situation of L3VPN business route tracking), PE should be built with a route
Tracking TLV is along with zero, (service label distributes mould to one or two other optional TLV
The formula TLV and/or service label number TLV of distribution) L3VPN business respond response message.
The end for routeing tracking TLV that request message is replicated is responded by from the L3VPN business for entering
When the system address of the additional PE of tail and the L3VPN business response request message for receiving entrance
Date-time (such as with NTP forms) route tracking TLV to produce.L3VPN business is returned
Answer in response message whether business that should be comprising service label allocation model TLV and/or distribution
Number of tags TLV depends on one or both of which (value=0) with the presence or absence of in entrance
L3VPN business is responded in request message.
(3) PE is grouped the response of the L3VPN business constructed by returning and answers by UDP IPv4
Answer message.
In a kind of realization of the invention, in order to avoid diagnosing the situation of all Business Entities
Lower many very similar L3VPN business are responded response message and are full of by the PE of response, each
The PE for carrying out response should postpone a random time intervals before response message is sent.Can
To use any rational random delay algorithm, postpone to calculate the invention is not limited in specific
Method.
In a kind of realization of the invention, the L3VPN business being only forwarded responds request
The data path of message traverses L3VPN traffic packets.The L3VPN business of return responds response
Message without L3VPN traffic packets data path, but by normal IP forward number
According to path.
In a kind of realization of the invention, because L3VPN traffic packets are from originating PE to spy
The PE that sets the goal may travel through multiple data paths of L3VPN traffic packets, so in initialization
L3VPN business is responded after request message, and originating PE is likely to be received multiple L3VPN industry
Response message is responded in business, and it represents that L3VPN business responds the multiple that request message may pass through
Data path, for example as shown in Figure 3.
For L3VPN business Ping and the CLI command of route tracing utility
L3VPN business Ping and route tracing utility can be with command line interface (Command
Line Interface, CLI) order to realize.In the CLI interfaces of PE, in current CLI
Context is that when L3VPN srvice instance is diagnosed, keeper can be come with for example following orders of use-case
Call L3VPN business Ping or route tracing utility：
l3vpn-ping*|ip-address[[no]service-label-assign-mode][[no]
nbr-of-service-label][hop hop-count]
l3vpn-traceroute*|ip-address[[no]service-label-assign-mode][[no]
nbr-of-service-label][hop hop-count]
Wherein, " * | ip-address " it is essential CLI parameters, which specify target L3VPN industry
Entity.* all L3VPN Business Entities are represented, ip-address is represented with appointing system
A specific L3VPN Business Entity on the PE of address.“[no]
Service-label-assign-mode " and " [no] nbr-of-service-label " are optional CLI ginsengs
Number, it is specified whether should Report service label allocation model and/or service label number.Realize
Person may decide that its default value.
" hop hop-count " is optional CLI parameters, and it defines L3VPN business and responds request
The initial TTL value of message.Implementor may decide that its default value.
Fig. 8 shows the side of the device 800 for the diagnosis of L3VPN business of the invention
Block diagram.Device 800 for example may be located in originating PE (PE).
As shown in Figure 8, device 800 includes：Construction unit 810, it is configured as structure
Build L3VPN business and respond request message；Transmitting element 820, it is configured as to the 2nd PE
Send L3VPN business and respond request message；Receiving unit 830, it is configured as receiving and
Response message is responded from the L3VPN business of the 2nd PE；Wherein, L3VPN business is responded and asked
Seeking message includes target service entity TLV, and the response of L3VPN business should be responded for specifying
The L3VPN Business Entities of request message.
In one implementation, target L3VPN Business Entities TLV is used to specify and should respond
The L3VPN Business Entities that the L3VPN business responds request message are all L3VPN business
Entity or a specific L3VPN Business Entity, and wherein, when target L3VPN business
Entity TLV is specified should respond the L3VPN industry that the L3VPN business responds request message
When entity is all L3VPN Business Entities, the 2nd PE is all participation L3VPN business
PE in any one in addition to a PE, as target L3VPN Business Entities TLV
The specified L3VPN Business Entities that should respond L3VPN business response request message are one
During specific L3VPN Business Entities, the 2nd PE is the specific L3VPN Business Entities.
In one implementation, L3VPN business responds request message and also includes being arranged to first
The message type field of value, and L3VPN business responds response message also including being arranged to
Different from the message type field of the second value of the first value.
In one implementation, responding request message when L3VPN business is used for L3VPN business
During route tracking, the L3VPN business responds request message also includes route tracking TLV, uses
The institute that request message is traveled through from a PE to termination PE is responded in the L3VPN business is indicated
There is the system address of PE.
In one implementation, L3VPN business is responded request message and is also distributed including service label
The pattern TLV and/or service label number TLV for being distributed, to be respectively used to indicate the 2nd PE
By the pattern and the service label number for distributing of L3VPN Business Entities distribution service label.
In one implementation, L3VPN business responds request message also including in the following
At least one：Version number, life span, reserved field, answer-mode, general error code,
Wrong subcode, the handle of sender, sequence number, transmission timestamp and reception specific to business
Timestamp.
Fig. 9 shows another device 900 for the diagnosis of L3VPN business of the invention
Block diagram.Device 900 for example may be located at other PE (second in addition to originating PE
PE in).
As shown in Figure 9, device 900 includes：Receiving unit 910, it is configured as connecing
Receive the L3VPN business from a PE and respond request message, the L3VPN business is responded please
Seeking message includes target L3VPN Business Entity TLV, and the L3VPN should be responded for specifying
Business responds the L3VPN Business Entities of request message；Determining unit 920, it is configured as
Determine the L3VPN business respond request message target be all L3VPN Business Entities or
One specific L3VPN Business Entity；Processing unit 930, it is configured as the L3VPN
When the target that business responds request message is all L3VPN Business Entities, returned to a PE
L3VPN business responds response message, updates L3VPN business and responds request message and forward
L3VPN business after renewal responds request message；And responded when the L3VPN business and asked
The target of message is a specific L3VPN Business Entity and the 2nd PE is that this is specific
During L3VPN Business Entities, return to L3VPN business to a PE and respond response message.
In one implementation, the L3VPN business responds request message and also includes being arranged to the
The message type field of one value, and the L3VPN business responds response message also including being set
It is set to the message type field of the second value different from the first value.
In one implementation, responding request message when the L3VPN business is used for L3VPN industry
During business route tracking, the L3VPN business responds response message also includes route tracking TLV,
For indicating the L3VPN business to respond what request message was traveled through from a PE to termination PE
The system address of all PE.
In one implementation, the L3VPN business responds response message also including service label point
With the pattern TLV and/or service label number TLV for being distributed, to be respectively used to indicate the 2nd PE
By the pattern and the service label number for distributing of L3VPN Business Entities distribution service label.
In one implementation, the processing unit 930 is additionally configured to：As the L3VPN
Business responds the not all L3VPN Business Entities of target of request message nor the 2nd PE
When, update the L3VPN business and respond request message and forward the L3VPN business after updating
Respond request message.
In one implementation, device 900 also includes authentication unit 940, for determining unit
The target that 920 determination L3VPN business respond request messages be all L3VPN Business Entities also
Before being a specific L3VPN Business Entity, checking L3VPN business responds request message.
More specifically, authentication unit 940 is configured to verify that in L3VPN business response request message
At least one checking item, the checking include version number, type of message, answer-mode,
Ttl value and TLV forms；And if any one of checking item mistake, then return to L3VPN
Business responds response message and stops forwarding L3VPN business and responds request message, wherein,
The L3VPN business responds response message to be included corresponding error code to indicate authentication error.
In one implementation, the processing unit 930 is obstructed by IP forwarding data paths
The data path for crossing L3VPN traffic packets returns to the L3VPN business response response message.
Summarize：
The invention provides two kinds of new L3VPN business diagnostic tool (L3VPN business Ping
Instrument and L3VPN business route tracing utility), it is to for the diagnosis of L2VPN business
The extension of previous invention.In order to support two kinds of new diagnostic tools, invention proposes to previous
The following extension of invention：Two kinds of new type of messages, four kinds of new mistake specific to business
Code, two kinds of new TLV, and describe to realize new L3VPN service Ping and route with
The behavior of the PE of track instrument or pseudo Algorithm.
In one or more exemplary designs, can with hardware, software, firmware or they
Any combination realize function described herein.If realized with software, can be by
The function is stored on a computer-readable medium as one or more instructions or code, or
Transmitted as one or more instructions on computer-readable medium or code.Computer-readable
Medium includes computer-readable storage medium and communication media, and wherein communication media includes helping to calculate
Machine program is delivered to the arbitrary medium of another place from place.Storage medium can be logical
With or the addressable any usable medium of special-purpose computer.This computer-readable medium can be wrapped
Include, such as but not limited to, RAM, ROM, EEPROM, CD-ROM or other CDs
Storage device, disk storage equipment or other magnetic storage apparatus, or can be used for general or special
With computer or universal or special processor it is addressable instruction or data structure form come
Carry or store any other medium of desired code modules.Also, any connection
Can be known as computer-readable medium.If for example, software is to use coaxial cable, light
Fine optical cable, twisted-pair feeder, Digital Subscriber Line (DSL) or such as infrared ray, radio and microwave
Etc wireless technology come from website, server or other remote sources transmission, then coaxial electrical
Cable, optical fiber cable, twisted-pair feeder, DSL or the such as nothing of infrared ray, radio and microwave etc
Line technology is also included within the definition of medium.
General processor, digital signal processor (DSP), application specific integrated circuit can be used
(ASIC), field programmable gate array (FPGA) or other PLDs, point
Found door or transistor logic, discrete hardware components or for performing appointing for function as herein described
Meaning combines to realize or perform with reference to various exemplary logical block, the module described by the disclosure
And circuit.General processor can be microprocessor, or, processor can also be any general
Logical processor, controller, microcontroller or state machine.Processor can also be embodied as meter
The combination of calculation equipment, for example, the combination of DSP and microprocessor, multi-microprocessor, one
Or the combination of multi-microprocessor and DSP core, or any other such structure.
Those of ordinary skill in the art are also understood that with reference to embodiments herein description
Various exemplary logical blocks, module, circuit and algorithm steps can be implemented as electronic hardware,
Computer software or combination.In order to clearly show that between hardware and software it is this can
Interchangeability, above to various exemplary parts, block, module, circuit and step around it
Function has carried out general description.As for this function be implemented as hardware be also implemented as it is soft
Part, depending on specific application and applying design constraint over the whole system.This area
Technical staff can be directed to every kind of application-specific, and described function is realized in the way of accommodation,
But, it is this to realize that decision-making should not be interpreted as causing a departure from the scope of this disclosure.
The above description of the disclosure is used to enable any those of ordinary skill of this area to realize
Or use the present invention.To those skilled in the art, the various modifications of the disclosure are all
Be it will be apparent that and general principle defined herein can also do not depart from it is of the invention
Other deformations are applied in the case of spirit and scope.Therefore, the present invention is not limited to this
Example and design described in text, but with principle disclosed herein and the most wide model of novel features
Enclose consistent.
Claims (15)
1. it is a kind of for L3VPN business diagnosis method, methods described include by a PE
The following steps of execution：
Build L3VPN business and respond request message；
The L3VPN business is sent to the 2nd PE respond request message；And
Receive the L3VPN business from the 2nd PE and respond response message；
Wherein, the L3VPN business responds request message includes target service entity TLV,
The L3VPN business realities that the L3VPN business responds request message should be responded for specifying
Body.
2. method according to claim 1, wherein, the target L3VPN business
Entity TLV is used to specify should respond the L3VPN that the L3VPN business responds request message
Business Entity be all L3VPN Business Entities or a specific L3VPN Business Entity,
Wherein, described in specifying and should respond as the target L3VPN Business Entities TLV
The L3VPN Business Entities that L3VPN business responds request message are all L3VPN business realities
During body, the 2nd PE is except a PE in all PE for participating in the L3VPN business
Outside any one,
The L3VPN should be responded when the target L3VPN Business Entities TLV is specified
The L3VPN Business Entities that business responds request message are a specific L3VPN Business Entity
When, the 2nd PE is the specific L3VPN Business Entities.
3. method according to claim 1, wherein, the L3VPN business is responded
Request message also includes being arranged to the message type field of the first value, and the L3VPN
Business responds response message also including being arranged to disappearing for the second value different from first value
Breath type field.
4. method according to claim 3, wherein, when the L3VPN business is returned
When answering request message to route tracking for L3VPN business, the L3VPN business responds request
Message also includes route tracking TLV, for indicating the L3VPN business to respond request message
From a PE to the system address for terminating all PE that PE is traveled through.
5. the method according to claim 3 or 4, wherein, the L3VPN business
Responding request message also includes service labels allocation model TLV and/or the service labels for being distributed
Number TLV, to be respectively used to indicate a PE to distribute business as L3VPN Business Entities
The pattern of label and the service label number for being distributed.
6. method according to claim 1, wherein, the L3VPN business is responded
Request message is also including at least one in the following：Version number, life span, reserved word
Section, answer-mode, general error code, specific to the wrong subcode of business, the sentence of sender
Handle, sequence number, transmission timestamp and reception timestamp.
7. it is a kind of for L3VPN business diagnosis method, methods described include by the 2nd PE
The following steps of execution：
Receive the L3VPN business from a PE and respond request message, the L3VPN
Business responds request message includes target L3VPN Business Entity TLV, should be rung for specifying
The L3VPN business is answered to respond the L3VPN Business Entities of request message；
Determine that the target that the L3VPN business responds request message is all L3VPN business
Entity or a specific L3VPN Business Entity；
When the target that the L3VPN business responds request message is all L3VPN business realities
During body, the 2nd PE returns to L3VPN business and responds response message to a PE,
The L3VPN business is updated to respond request message and forward the L3VPN business after updating to return
Answer request message；And
When the target that the L3VPN business responds request message is a specific L3VPN
Business Entity and when the 2nd PE is the specific L3VPN Business Entities, described second
PE returns to L3VPN business and responds response message to a PE.
8. method according to claim 7, wherein, the L3VPN business is responded
Request message also includes being arranged to the message type field of the first value, and the L3VPN
Business responds response message also including being arranged to disappearing for the second value different from first value
Breath type field.
9. method according to claim 8, wherein, when the L3VPN business is returned
When answering request message to route tracking for L3VPN business, the L3VPN business responds response
Message also includes route tracking TLV, for indicating the L3VPN business to respond request message
From a PE to the system address for terminating all PE that PE is traveled through.
10. method according to claim 8 or claim 9, wherein, the L3VPN industry
Response message is responded in business also includes service label allocation model TLV and/or the business mark for being distributed
Number TLV is signed, is L3VPN Business Entity distribution businesses to be respectively used to indicate the 2nd PE
The pattern of business label and the service label number for being distributed.
11. methods according to claim 7, also include：
When the L3VPN business responds the not all L3VPN business of target of request message
Entity is nor during two PE, the 2nd PE updates the L3VPN business and responds
Request message and forward update after L3VPN business respond request message.
12. methods according to claim 7, also include, it is determined that the L3VPN
The target that business responds request message is that all L3VPN Business Entities or one are specific
Before L3VPN Business Entities：
Verify that the L3VPN business responds request message, it is further included：
Verify that the L3VPN business responds at least one of request message checking item, institute
Stating checking item includes version number, type of message, answer-mode, ttl value and TLV forms；
If any one of checking item mistake, returns to the L3VPN business and returns
Answer response message and stop forwarding the L3VPN business and respond request message, wherein, institute
State L3VPN business and respond response message including corresponding error code to indicate authentication error.
13. methods according to claim 7, wherein, by IP forwarding data paths
Response is responded without returning to the L3VPN business by the data path of L3VPN traffic packets
Message.
A kind of 14. devices for the diagnosis of L3VPN business, described device is located at a PE
In, including：
Construction unit, it is configured as building L3VPN business response request message；
Transmitting element, it is configured as being responded to the 2nd PE transmission L3VPN business and asks
Seek message；And
Receiving unit, it is configured as receiving the L3VPN business from the 2nd PE time
Answer response message；
Wherein, the L3VPN business responds request message includes target service entity TLV,
The L3VPN business realities that the L3VPN business responds request message should be responded for specifying
Body.
A kind of 15. devices for the diagnosis of L3VPN business, described device is located at the 2nd PE
In, including：
Receiving unit, it is configured as receiving the L3VPN business response from a PE please
Message is sought, the L3VPN business responds request message includes target L3VPN Business Entities
TLV, the L3VPN industry that the L3VPN business responds request message should be responded for specifying
Entity；
Determining unit, it is configured to determine that the L3VPN business responds request message
Target is all L3VPN Business Entities or a specific L3VPN Business Entity；And
Processing unit, it is configured as the mesh that the L3VPN business responds request message
When mark is all L3VPN Business Entities, returns to L3VPN business to a PE and respond
Response message, updates after the L3VPN business responds request message and forward renewal
L3VPN business responds request message；And when the L3VPN business responds request message
Target is a specific L3VPN Business Entity and the 2nd PE is that this is specific
During L3VPN Business Entities, return to L3VPN business to a PE and respond response message.
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| CN201510864379.5A CN106817273B (en) | 2015-11-30 | 2015-11-30 | Method and apparatus for L3VPN service diagnosis |
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|---|---|---|---|---|
| CN102437931A (en) * | 2011-12-29 | 2012-05-02 | 华为技术有限公司 | Detection method and device of service path |
| CN102739448A (en) * | 2012-06-28 | 2012-10-17 | 华为技术有限公司 | Method, device and system for transmitting messages |
| CN103457794A (en) * | 2013-08-22 | 2013-12-18 | 华为技术有限公司 | Method and system for confirming faults of IP bearer network |
| US9042369B2 (en) * | 2013-03-13 | 2015-05-26 | Alcatel Lucent | System and method for reflecting FEC route information |
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2015
- 2015-11-30 CN CN201510864379.5A patent/CN106817273B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102437931A (en) * | 2011-12-29 | 2012-05-02 | 华为技术有限公司 | Detection method and device of service path |
| CN102739448A (en) * | 2012-06-28 | 2012-10-17 | 华为技术有限公司 | Method, device and system for transmitting messages |
| US9042369B2 (en) * | 2013-03-13 | 2015-05-26 | Alcatel Lucent | System and method for reflecting FEC route information |
| CN103457794A (en) * | 2013-08-22 | 2013-12-18 | 华为技术有限公司 | Method and system for confirming faults of IP bearer network |
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