CN106850256A - A kind of Packet Transport Network and its guard method, network element device - Google Patents
A kind of Packet Transport Network and its guard method, network element device Download PDFInfo
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- CN106850256A CN106850256A CN201611190156.6A CN201611190156A CN106850256A CN 106850256 A CN106850256 A CN 106850256A CN 201611190156 A CN201611190156 A CN 201611190156A CN 106850256 A CN106850256 A CN 106850256A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0668—Management of faults, events, alarms or notifications using network fault recovery by dynamic selection of recovery network elements, e.g. replacement by the most appropriate element after failure
Abstract
The invention discloses a kind of Packet Transport Network and its guard method, network element device, belong to communication technical field.Packet Transport Network includes：First network element device, the second network element device, the 3rd network element device and user network boundary device, first network element device is connected with the second network element device and the 3rd network element device respectively by both links, second network element device and the 3rd network element device are connected, and the second network element device and the 3rd network element device are connected with user network boundary device respectively；PW1 is configured between first network element device and the second network element device, PW2 is configured between the first network element device and the 3rd network element device；PW1 is carried on the LSP1 configured between the first network element device and the second network element device, or PW1 is carried on the LSP11 configured between the first network element device, the 3rd network element device and the second network element device；PW2 is carried on the LSP2 configured between the first network element device and the 3rd network element device, or PW2 is carried on the LSP22 configured between the first network element device, the second network element device and the 3rd network element device.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of Packet Transport Network and its guard method, network element device.
Background technology
Packet Transport Network (English Packet Transport Network, abbreviation PTN) is industry by discussion for many years
The delivery platform of future generation for progressively getting the nod afterwards, it is the product that tranmission techniques and Ethernet bearing technology are combined, to divide
Group is carried based on carrier ethernet business, compatible time division multiplex (English Time Division as unit of transfer
Multiplexing, abbreviation TDM), asynchronous transfer mode (English Asynchronous Transfer Mode, abbreviation ATM) etc.
The comprehensive tranmission techniques of business, with Multiple Spanning Tree Protocol (Multi-Service Transfer Platform, abbreviation MSTP) originally
Matter is distinguished：MSTP is interior consideration convey with TDM, and PTN is with packet switch as kernel.Supporting the technology of PTN has a lot, wherein main
Flow Technique be multiprotocol label switching (English Multi-Protocol Label Switching, abbreviation MPLS) subset technology and
Operator backbone tranmission techniques (English Provider Backbone Transport, abbreviation PBT).
PTN protection techniques are divided into three major types：The access link protection of protection, PTN and business network and dual homed in PTN network
Protection.Wherein, in PTN network and business network by dual node interconnection, binode is arranged as dual homed node, dual homed to dual-homing protection
Protection is constituted by two sections, and one section is protection in PTN network, and another section is access link protection, and dual-homing protection mechanism needs to rely on
Protection is realized with access link protection cooperation in PTN network.
Realize it is of the invention during, inventor find prior art be primarily present problems with：
1) the main linear protection of protection and looped network protection in PTN network, its protection technique are more ripe, but in network
Protection cannot be perceived for the failure of access link, once service access goes wrong, the protection in network will lose meaning.
2) access link part also uses some protected modes, common such as with Ethernet link clustering (English Link
Aggregation, abbreviation LAG) realize that Ethernet access link is protected, but this independent access link guard method is protected
Protective switching is only carried out on one node, and when the node failure in itself, it is impossible to realize pretection switch, business can not be protected
Barrier, reliability is not high.
The content of the invention
In order to solve problems of the prior art, a kind of Packet Transport Network and its protection are the embodiment of the invention provides
Method, network element device.The technical scheme is as follows：
In a first aspect, the embodiment of the invention provides a kind of Packet Transport Network, the Packet Transport Network includes：
First network element device, the second network element device, the 3rd network element device and user network boundary device, first network element
Equipment is connected by a MPLS tunnels with second network element device, first network element device by the 2nd MPLS tunnels with
The 3rd network element device connection, second network element device and the 3rd network element device are connected, second network element device
Be connected with the user network boundary device by the first access link, the 3rd network element device by the second access link with
The user network boundary device connection；Service aisle is configured between first network element device and second network element device
PW1, is configured with protection passage PW2 between first network element device and the 3rd network element device；The service aisle PW1 holds
It is loaded on the active channel LSP1 configured between first network element device and second network element device, or, the work
Passage PW1 is carried on the guarantor configured between first network element device, the 3rd network element device and second network element device
On shield path LSP11；The protection passage PW2 is carried between first network element device and the 3rd network element device and configures
Active channel LSP2 on, or, the protection passage PW2 is carried on first network element device, second network element device
On the protection path LSP22 configured and the 3rd network element device between.
Second aspect, the embodiment of the present invention additionally provides a kind of Packet Transport Network guard method, as described in first aspect
First network element device is performed, and methods described includes：Obtain fault message；Judge that present data transmission is passed through according to the fault message
The path crossed whether there is failure；When there is failure in the path that present data transmission passes through, failure judgement type, the failure
Type includes at least one in the first access link fault, the second network element device failure, a MPLS tunnel failures, Huo Zhesuo
Stating fault type includes at least one in the second access link fault, the 3rd network element device failure, the 2nd MPLS tunnel failures；
When being carried out data transmission using service aisle PW1, if fault type is a MPLS tunnel failures, data are cut
Change to and be transmitted on the protection path LSP11；If the fault type includes first access link fault or institute
The second network element device failure is stated, then will be transmitted on data exchange to the protection passage PW2；When using service aisle PW2
When carrying out data transmission, if fault type is the 2nd MPLS tunnel failures, by data exchange to the protection path
It is transmitted on LSP22；If fault type is second access link fault or the 3rd network element device failure, will
Data exchange is transmitted to described protection on passage PW1.
In a kind of implementation of the embodiment of the present invention, the acquisition fault message, including：Receive second network element
The Client Signal Fail CSF message that equipment or the 3rd network element device send, the CSF message sets including second network element
The port failure information linked between standby or the 3rd network element device and the user network boundary device；Or, by operation
Management service OAM mechanism obtains the fault message of second network element device or the 3rd network element device；Or, by OAM
Mechanism obtains a MPLS tunnels or the 2nd MPLS tunnel failure information.
It is described that present data transmission is judged according to the fault message in another implementation of the embodiment of the present invention
The path of process whether there is failure, including：According to the fault message determine break down access link, network element device and
At least one of MPLS tunnels；In the access link, network element device and the MPLS tunnels that are broken down described in judging at least one
It is individual with the presence or absence of on the path passed through in present data transmission；As the access link for breaking down, network element device and MPLS
At least one of tunnel is present in when on the path that the present data transmission passes through, and judges that the present data transmission passes through
Path there is failure；When at least one of the access link for breaking down, network element device and MPLS tunnels do not exist
When on the path that the present data transmission passes through, judge that the path that the present data transmission passes through does not exist failure.
In another implementation of the embodiment of the present invention, the failure judgement type, including：Determine the current number
According to the malfunction of the access link on the path being transferred through, network element device and MPLS tunnels, the malfunction includes event
Barrier and non-failure；According to the event in the access link on the path that the present data transmission passes through, network element device and MPLS tunnels
Barrier state, determines the fault type.
It is described by data exchange to the protection path LSP11 in another implementation of the embodiment of the present invention
It is transmitted, including：The MPLS label of data to be transmitted is substituted for Lable1+Lable3 by label Lable1+Lable2, institute
State Lable1 corresponding with the service aisle PW1, the Lable2 is corresponding with the active channel LSP1, the Lable3 and institute
State protection path LSP11 correspondences；Send the data to be transmitted after tag replacement；It is described by data exchange to the protection passage
It is transmitted on PW2, including：The MPLS label of data to be transmitted is substituted for Lable4+ by label Lable1+Lable2
Lable5, the Lable4 are corresponding with the protection passage PW2, and the Lable5 is corresponding with the active channel LSP2；Send
Data to be transmitted after tag replacement.
The third aspect, the embodiment of the present invention additionally provides a kind of network element device, and the network element device is described in first aspect
The first network element device in Packet Transport Network, the network element device includes：Acquisition module, for obtaining fault message；First sentences
Disconnected module, for judging that the path that present data transmission passes through whether there is failure according to the fault message；Second judges mould
Block, when the path for passing through when present data transmission has failure, failure judgement type, the fault type connects including first
At least one in incoming link failure, the second network element device failure, a MPLS tunnel failures, or the fault type includes
At least one in second access link fault, the 3rd network element device failure, the 2nd MPLS tunnel failures；Processing module, is used for
When being carried out data transmission using service aisle PW1, if fault type is a MPLS tunnel failures, data are cut
Change to and be transmitted on the protection path LSP11；If the fault type includes first access link fault or institute
The second network element device failure is stated, then will be transmitted on data exchange to the protection passage PW2；When using service aisle PW2
When carrying out data transmission, if fault type is the 2nd MPLS tunnel failures, by data exchange to the protection path
It is transmitted on LSP22；If fault type is second access link fault or the 3rd network element device failure, will
Data exchange is transmitted to described protection on passage PW1.
In a kind of implementation of the embodiment of the present invention, the acquisition module, for receiving second network element device
Or the Client Signal Fail CSF message that the 3rd network element device sends, the CSF message include second network element device or
The port failure information linked between the 3rd network element device and the user network boundary device；Or, by operational administrative
Safeguard that OAM mechanism obtains the fault message of second network element device or the 3rd network element device；Or, by OAM mechanism
Obtain a MPLS tunnels or the 2nd MPLS tunnel failure information.
In another implementation of the embodiment of the present invention, first judge module, for being believed according to the failure
Breath determines at least one of access link, network element device and MPLS tunnels for breaking down；That is broken down described in judging connects
At least one of incoming link, network element device and MPLS tunnels are with the presence or absence of on the path passed through in present data transmission；Work as institute
State at least one of access link, network element device and MPLS tunnels for breaking down and be present in the present data transmission and pass through
Path on when, judge that the path that the present data transmission passes through has failure；When the access link for breaking down, net
At least one of element device and MPLS tunnels are not present in when on the path that the present data transmission passes through, and judge described working as
The path that preceding data transfer is passed through does not exist failure.
In another implementation of the embodiment of the present invention, second judge module, for determining the current number
According to the malfunction of the access link on the path being transferred through, network element device and MPLS tunnels, the malfunction includes event
Barrier and non-failure；According to the event in the access link on the path that the present data transmission passes through, network element device and MPLS tunnels
Barrier state, determines the fault type.
The present invention judges that the path that present data transmission passes through whether there is failure, and working as by detecting fault message
When there is failure in the path that preceding data transfer is passed through, failure judgement type；If fault type is MPLS tunnel failures, carry out
LSP switches, if fault type includes access link fault or network element device failure, carries out PW switchings so that the packet is passed
Sending network protection method can not only solve access link fault, while node failure, MPLS tunnel failures in itself can also be solved
The transmission problem for causing.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be to that will make needed for embodiment description
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 structural representation of Packet Transport Network provided in an embodiment of the present invention；
Fig. 2 is a kind of Packet Transport Network guard method flow chart provided in an embodiment of the present invention；
Fig. 3 is the structural representation of another Packet Transport Network provided in an embodiment of the present invention；
Fig. 4 is the structural representation of another Packet Transport Network provided in an embodiment of the present invention；
Fig. 5 is the structural representation of another Packet Transport Network provided in an embodiment of the present invention；
Fig. 6 is the structural representation of another Packet Transport Network provided in an embodiment of the present invention；
Fig. 7 is the structural representation of another Packet Transport Network provided in an embodiment of the present invention；
Fig. 8 is a kind of structured flowchart of network element device provided in an embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
Fig. 1 is a kind of structural representation of Packet Transport Network provided in an embodiment of the present invention, referring to Fig. 1, Packet Transport Network
Including：
First network element device NE1, the second network element device NE2, the 3rd network element device NE3 and user network boundary device CE,
First network element device NE1 is connected by a MPLS tunnels with the second network element device NE2, and the first network element device NE1 passes through second
MPLS tunnels are connected with the 3rd network element device NE3, and the second network element device NE2 and the 3rd network element device NE3 is connected, and the second network element sets
Standby NE2 is connected by the first access link with user network boundary device CE, and the 3rd network element device NE3 passes through the second access link
It is connected with user network boundary device CE.Wherein, the first network element device NE1 and the second network element device NE2 is connected by physical link
Connect, and MPLS tunnels are configured with physical link, the first network element device NE1 and the 3rd network element device NE3 passes through physical link
Connection, and MPLS tunnels are configured with physical link.
Service aisle PW1, the first network element device NE1 are configured between first network element device NE1 and the second network element device NE2
And the 3rd be configured with protection passage PW2 between network element device NE3.
Service aisle PW1 is carried on the active channel configured between the first network element device NE1 and the second network element device NE2
On LSP1, or, service aisle PW1 is carried on the first network element device NE1, the 3rd network element device NE3 and the second network element device NE2
Between configure protection path LSP11 on.That is LSP1 and LSP11 is active and standby setting, when one of failure, using another
Carry PW1.
Protection passage PW2 is carried on the active channel configured between the first network element device NE1 and the 3rd network element device NE3
On LSP2, or, protection passage PW2 is carried on the first network element device NE1, the second network element device NE2 and the 3rd network element device NE3
Between configure protection path LSP22 on.That is LSP2 and LSP22 is active and standby setting, when one of failure, using another
Carry PW2.
Wherein, the first network element device NE1, the second network element device NE2 and the 3rd network element device NE3 are specifically as follows and meet
The core PSE of PTN standards.
Wherein, user network boundary device CE is specifically as follows customer network edge router.
Wherein, links of the second network element device NE2 (or the 3rd network element device NE3) and user network boundary device CE between
Can be the 1st grade of synchronous transfer module (English Synchronous Transfer Module-1, abbreviation STM-1) link or thousand
Mbit ethernet (English Gigabit Ethernet, abbreviation GE)/10GE links.
Wherein, the link and the first network element device NE1 between can for the second network element device NE2 (or the 3rd network element device NE3)
Think ten thousand mbit ethernets (10GE) link.Link between second network element device NE2 and the 3rd network element device NE3 can be 10,000,000,000
Ethernet (10GE) link.
G.8131 the agreement of the equal configuration standard of NE1, NE2 and NE3, creates Virtual Channel between NE2 and NE3.NE2 and NE3 pass through
Between (fill in private message in PW layers of OAM and realize based on extending) by interacting message, invent a node in logic,
So as to open standard G8131 agreements, and each other can be with converting flow.CE opens Smartlink (independent detection), or CE
Multi-frame (English Multi Chassis LAG, abbreviation MC-LAG) agreement is opened between NE2 (NE3).
In Packet Transport Network, pseudo-wire (English Pseudo-Wire, abbreviation PW) is passage aspect, label switched path
(English Label Switching Path, abbreviation LSP) is path aspect, and LSP carries PW.Foregoing two LSP1 and LSP11
In, used as the primary path for carrying PW1, LSP11 is used as the Protection path for carrying PW1 for LSP1；In LSP2 and LSP22, LSP2 makees
To carry the primary path of PW2, LSP22 is used as the Protection path for carrying PW2；PW1 and PW2 be service layer service aisle and
Protection passage.
In embodiments of the present invention, can also be by other network element devices, such as Fig. 3-Fig. 7 institutes between NE1 and NE2 (NE3)
The NE4 (NE5) for showing.In shown in Fig. 3-Fig. 7, by NE1, NE4 and NE2, the 2nd MPLS tunnels pass through in a MPLS tunnels
NE1, NE5 and NE3, LSP and PW are set referring to shown in Fig. 3-Fig. 7.
As shown in Fig. 1, Fig. 3-7, the Packet Transport Network can also include data network analyzer K, data network analyzer
It is connected between NE1 and CE, for the data of analog subscriber, statistics reiving/transmitting state.
The Packet Transport Network that Fig. 1 is provided configures pseudo-wire the Virtual Channel PW1 and PW2 of carrying business after physics networking is completed,
PW1 is pseudo-wire layer service aisle, and PW2 is the protection passage of PW1.Virtual pseudo wires PW3 (transmission between configuration node (NE2 and NE3)
APS (English Automatic Protection Switched, abbreviation APS) message), PW3 is also used for transmitting industry
Business data, when business datum is by PW2, if the access link fault of node NE3, and the access link of NE2 is intact, then need
Business datum is passed to NE2 by PW3, then CE is sent to from NE2.The virtual path LSP1 and LSP11 of configuration carrying pseudo-line,
LSP2 and LSP22, LSP1 are the active channel of PW1, and LSP11 is the protection path of PW1, and LSP2 is the active channel of PW2,
LSP22 is the protection path of PW2.Virtual Channel layer PW layers of OAM of operation, virtual path layer LSP layers of OAM (other implementation methods of operation
Can be in the OAM of virtual path layer operation virtual path layer LSP), the connectedness in monitoring different aspects path detects neighbor logic with this
Inter-entity (network element device) whether failure, if need trigger protection；Access link then on CE run Smartlink realize it is superfluous
The monitoring and protection of remaining link.PTN code requirement different aspects need to use the OAM of different aspects to detect, PTN specifications regulation
OAM includes：Ethernet service OAM, access link OAM, PW layer OAM, LSP layer OAM and section layer OAM (looped network protection is used).
Such as, PTN is configured with 10 PW, if wherein one PW failure, is detected by PW layers of OAM, is now detected by PW layers of OAM,
The PW of this failure need to only be switched, other PW are unaffected.If active channel lsp failure, protection path is directly switch to
LSP, PW layer does not perceive.
Fig. 2 is a kind of flow chart of Packet Transport Network guard method provided in an embodiment of the present invention, and the method is based on Fig. 1's
Packet Transport Network realizes that the method includes：
Step 201：First network element device obtains fault message.
Receive Client Signal Fail (the English Client Signal that the second network element device or the 3rd network element device send
Fail, abbreviation CSF) message, CSF message includes chain between the second network element device or the 3rd network element device and user network boundary device
The port failure information for connecing；Or, by operation management maintainance (English Operation Administration and
Maintenance, abbreviation OAM) mechanism obtains the fault message of the second network element device or the 3rd network element device；Or, by OAM
Mechanism obtains a MPLS tunnels or the 2nd MPLS tunnel failure information.
Wherein, NE2 (or NE3) can judge NE2 by the way that whether the port linked between judgement and CE is in down states
The port that (or NE3) is linked between CE whether failure；Port is in down states, then judge port failure, on the contrary then non-failure.
Or, NE2 (or NE3) can be by the agreement timeout mechanism of unlatching between CE, and timing transmission detection messages, pass through between the two
Detection messages come judge the port that is linked between user network boundary device whether failure；Timing receives detection messages and then judges end
The non-failure of mouth, otherwise judges port failure.
Wherein, NE2 (or NE3) can also obtain a MPLS tunnels or the 2nd MPLS tunnel failures letter by OAM mechanism
Breath.
In embodiments of the present invention, when NE2 (or NE3) is failure, NE2 (or NE3) can also get fault message；
When NE2 (or NE3) gets fault message, identical method in step 202~204 can be performed, to realize data transfer
Path switches.
Further, for CE, CE is by the access link of technology perception first such as MC-LAG, Smartlink or the
Two access link faults, and in the first access link fault, be switched to the second access link and carry out data transmission, connect second
During incoming link failure, it is switched to the first access link and carries out data transmission.
Step 202：Judge that the path that present data transmission passes through whether there is failure according to fault message.
Specifically, step 202 can include：
At least one of access link, network element device and MPLS tunnels for determining to break down according to fault message；
At least one of access link, network element device and MPLS tunnels that judgement is broken down whether there is in current number
According on the path being transferred through；
When at least one of access link, network element device and MPLS tunnels for breaking down is present in present data transmission
When on the path of process, judge that the path that present data transmission passes through has failure；When the access link, network element that break down set
At least one of standby and MPLS tunnels are not present in when on the path of present data transmission process, judge that present data transmission is passed through
The path crossed does not exist failure.
That is, according to the fault message for getting, it is determined that there is the access link of failure, network element device and MPLS tunnels
At least one of road；Then therefrom select be in present data transmission process path on access link, network element device and
At least one of MPLS tunnels；When exist be in present data transmission process path on access link, network element device or
During person's MPLS tunnel failures, the path failure that present data transmission passes through is judged, otherwise judge the road that present data transmission passes through
The non-failure in footpath.
Wherein, the path that present data transmission passes through includes access link, network element node (NE2 or NE3) and MPLS tunnels.
For example, when the access link of path first of present data transmission process, NE2 and a MPLS tunnels, if detection
To NE2 failures, it is determined that the path that present data transmission passes through has failure, if detecting NE3 failures, it is determined that current number
Do not exist failure according to the path being transferred through.
Step 203：When the path that present data transmission passes through has failure, failure judgement type, fault type includes
At least one in first access link fault, the second network element device failure, a MPLS tunnel failures, or fault type bag
Include at least one in the second access link fault, the 3rd network element device failure, the 2nd MPLS tunnel failures.
Specifically, step 203 can include：Determine that the access link on the path that present data transmission passes through, network element set
The malfunction in standby and MPLS tunnels, malfunction includes failure and non-failure；
According to the malfunction of access link, network element device and MPLS tunnels on the path that present data transmission passes through,
Determine fault type.
Specifically, if failure only on the path passed through of present data transmission, such as access link, then failure classes
Type is access link fault.If failure, such as access link and network element at only two on the path that present data transmission passes through
Equipment, then fault type include access link fault and network element device failure.
For example, when the access link of path first of present data transmission process, NE2 and a MPLS tunnels, if detection
To NE2 failures, it is determined that fault type is the second network element device failure.
Step 204：When being carried out data transmission using service aisle PW1, if fault type is MPLS tunnels event
Barrier, then will be transmitted on data exchange to protection path LSP11；If fault type includes the first access link fault or the
Two network element device failures, then will be transmitted on data exchange to protection passage PW2；Data are carried out when service aisle PW2 is used
During transmission, if fault type is the 2nd MPLS tunnel failures, will be transmitted on data exchange to protection path LSP22；
If fault type is the second access link fault or the 3rd network element device failure, by data exchange to protection passage PW1
It is transmitted.
In embodiments of the present invention, both can be using PW1 as main channel, PW2 is used as standby passage；PW2 can also be used
Used as main channel, PW1 is used as standby passage.When being described in step 204 is carried out data transmission using main channel, after failure
Passage or path switch, and after fault restoration, can be switched to former passage or path is transmitted.
Wherein, will be transmitted on data exchange to protection path LSP11, including：
The MPLS label of data to be transmitted is substituted for Lable1+Lable3 by label Lable1+Lable2, Lable1 with
Service aisle PW1 correspondences, Lable2 is corresponding with active channel LSP1, and Lable3 is corresponding with protection path LSP11；Label is sent to replace
Data to be transmitted after changing.
To be transmitted on data exchange to protection passage PW2, including：
The MPLS label of data to be transmitted is substituted for Lable4+Lable5 by label Lable1+Lable2, Lable4 with
Protection passage PW2 correspondences, Lable5 is corresponding with active channel LSP2；Send the data to be transmitted after tag replacement.
Wherein, NE1 (NE2, NE3) is stored with the path of each passage PW and individual channel LSP, and corresponding with each PW
Label, port corresponding with each LSP.For example, the corresponding label of PW1, LSP1, LSP11, PW2, LSP2, LSP22 is followed successively by
Lable1, Lable2, Lable3, Lable4, Lable5 and Lable6.
Wherein, will data exchange to the method being transmitted on protection passage PW1 with by data exchange to protecting passage PW2
On be transmitted it is identical, will data exchange to active channel LSP2, protection path LSP22 or active channel LSP1 on be transmitted
Method with will data exchange it is identical to being transmitted on protection path LSP11, do not repeat here.
Alternatively, the method also includes：Whether detection failure is recovered；After fault recovery, by data exchange to original
PW or LSP are transmitted.
What deserves to be explained is, in embodiments of the present invention, in the second network element device failure or the 3rd network element device failure,
PW2 or PW1 is not directly switched to, but first carries out the PW switchings carried out again after LSP switchings, then LSP handoff failures.I.e.：
In the second network element device failure, LSP11 first is switched to from LSP1, now, service message still cannot be transmitted, then PW1 is cut
Change to PW2；In the 3rd network element device failure, LSP22 first is switched to from LSP2, now, service message still cannot be transmitted, then
PW2 is switched to PW1.This is, because LSP layers of testing mechanism will be faster than PW layers, so LSP protections can be triggered first, then to trigger
PW is protected.
Method provided in an embodiment of the present invention supports the business end-to-end protection under transmission path diverse location fault condition,
Access link fault, NE failures, PTNMPLS tunnel failures and combinations thereof are specifically included, may refer to hereinafter retouch Fig. 3-Fig. 7
State part.In dual-homing protection, in addition to two nodes being connected with client-side device (CE), the detection machine of other nodes in network
System and wrap protection all same (with the guard method of NE1).The detection that LSP layers of OAM detection cycle will be much smaller than PW layer is all
Phase ensures that LSP layers of protection mechanism first starts, and LSP carries some PW, and LSP is detected prior to PW, can avoid some PW wholes
After the completion of switching, then passage layers switching is carried out, save switching time.The guard method can share band with protection in network
Width, extra bandwidth demand is not increased.Protection and access link protection are synchronously carried out in network, and protection and access link in network
50ms is less than the time required to protection, therefore the end-to-end protection time is less than 50ms, when breaking down, transmission path switch speed
Hurry up.
Fig. 3 is the structural representation of another Packet Transport Network, and PTN network is by NE1, NE2, NE3, NE4, NE5 and CE six
Individual network node composition, business is accessed by network node NE1, picked out by network node CE.As shown in figure 3, the work of configuration service
Make passage PW1 (NE1-NE4-NE2), protection passage PW2 (NE1-NE5-NE3)；Configure the active channel LSP1 (NE1- of PW1
NE4-NE2), protection path LSP11 (NE1-NE5-NE3-NE2)；The active channel LSP2 (NE1-NE5-NE3) of PW2 is configured, is protected
Virtual path PW3 (NE2-NE3, not shown) between shield path LSP22 (NE1-NE4-NE2-NE3), configuration NE2 and NE3.
Fig. 4 shows transmission schematic diagram during access link fault in Fig. 3.Under normal circumstances, business is by service aisle PW1
(NE1-NE4-NE2) NE2 is sent to, and destination is reached by CE nodes, node NE2 must enable CSF, as shown in figure 4,
NE1->NE4->NE2->Vocational work path when CE is normal condition.Work as NE2->Access link (the primary access link of CE
(the first access link), position shown in Fig. 4 labels 1) failure, NE2 detects failure, and fault message is carried in CSF message,
CSF message is encapsulated in TP OAM messages and notifies that node NE1, NE1 receive CSF message, it is believed that the first access link fault, triggering
PW switches (switching for service channel aspect), and protection passage PW2 is switched to by service aisle PW1, and now path is NE1->NE5-
>NE3->CE.CE is by Smartlink technology perceptions to NE2->Failure between CE, triggering access link protection, is switched to and NE3
On connected standby access link (the second access link), now finishing service pretection switch.
Fig. 5 shows transmission schematic diagram during network element device failure in Fig. 3.Under normal circumstances, business is by service aisle PW1
(NE1-NE4-NE2) NE3 is sent to, and destination is reached by CE nodes, as shown in figure 5, NE1->NE4->NE2->CE is just
Vocational work path during reason condition.When node NE2 (position shown in Fig. 5 labels 2) breaks down, NE1 passage layers (LSP layers)
OAM mechanism can detect failure, triggering passage layer protection (LSP1 is switched to LSP11), now business datum still cannot be just
Often transmission.Then the OAM mechanism of NE1 channel layers (PW layers) can detect failure, switching for service channel aspect be triggered, by working
Passage PW1 is switched to protection passage PW2, and now path is NE1->NE5->NE3->CE.CE passes through Smartlink technology perceptions
To NE2->Failure between CE, triggering access link protection, is switched on the standby access link being connected with NE3, now finishing service
Pretection switch.
Fig. 6 shows transmission schematic diagram during MPLS tunnel failures in Fig. 3.As shown in fig. 6, NE1->NE4->NE2->CE
Vocational work path when being normal condition.When link (such as position shown in label 3 in Fig. 6) hair between node NE1 and NE2
During raw failure, passage layers (LSP layers) preferentially detect failure, and trigger protection, active channel LSP1 is switched to protection path
LSP11, PW1 do not perceive (i.e. channel layer PW1 fault-frees), now finishing service pretection switch.
Fig. 7 shows transmission schematic diagram when there is failure at two in Fig. 3.As shown in fig. 7, NE1->NE4->NE2->CE
Vocational work path when being normal condition.When the link (position shown in Fig. 7 labels 4) between node NE1 and NE2 breaks down
When, passage layers preferentially detect failure, trigger protection, and active channel LSP1 is switched to protection path LSP11, and PW1 is not perceived, this
When operating path be NE1->NE5->NE3->NE2->CE；Between node NE2 and CE there is link event in (position shown in Fig. 7 labels 5)
Barrier, NE2 detects failure, CSF message is encapsulated in TP OAM messages and notifies that node NE1, NE1 receive CSF message, it is believed that the
One access link fault, triggering PW switchings, operating path change turns to NE1->NE5->NE3->CE, now finishing service protection is fallen
Change.
The entry number of the nodes in above-mentioned accompanying drawing and example, topological diagram and ring label, work and Protection path are matched somebody with somebody
Put and the quantity and operating path of business are exemplary illustration, be not intended as the restriction to inventing, it is proposed by the invention
Technical scheme is applied to the network topology that various dual homeds access networking.
It is below the device embodiment of the embodiment of the present invention, for the details not described in detail in device embodiment, please joins
It is admitted to and states corresponding embodiment of the method.
Fig. 8 is a kind of structured flowchart of network element device provided in an embodiment of the present invention, and network element device is Fig. 1, Fig. 3~Fig. 7
The first network element device in shown Packet Transport Network, network element device includes：
Acquisition module 301, for obtaining fault message；
First judge module 302, for judging that the path that present data transmission passes through whether there is event according to fault message
Barrier；
Second judge module 303, when there is failure in the path for passing through when present data transmission, failure judgement type,
Fault type includes at least one in the first access link fault, the second network element device failure, a MPLS tunnel failures, or
Person's fault type includes at least one in the second access link fault, the 3rd network element device failure, the 2nd MPLS tunnel failures；
Processing module 304, for when being carried out data transmission using service aisle PW1, if fault type is first
MPLS tunnel failures, then will be transmitted on data exchange to protection path LSP11；If fault type includes that first accesses chain
Road failure or the second network element device failure, then will be transmitted on data exchange to protection passage PW2；
When being carried out data transmission using service aisle PW2, if fault type is the 2nd MPLS tunnel failures, by number
It is transmitted according to being switched on protection path LSP22；If fault type is the second access link fault or the 3rd network element device
Failure, then will be transmitted on data exchange to protection passage PW1.
In embodiments of the present invention, acquisition module 301 can be used for：
Receive the Client Signal Fail CSF message that the second network element device or the 3rd network element device send, CSF message includes the
The port failure information linked between two network element devices or the 3rd network element device and user network boundary device；Or,
The fault message of the second network element device or the 3rd network element device is obtained by operation management maintainance OAM mechanism；Or,
First MPLS tunnels or the 2nd MPLS tunnel failure information are obtained by OAM mechanism.
In embodiments of the present invention, the first judge module 302 can be used for：
At least one of access link, network element device and MPLS tunnels for determining to break down according to fault message；
At least one of access link, network element device and MPLS tunnels that judgement is broken down whether there is in current number
According on the path being transferred through；
When at least one of access link, network element device and MPLS tunnels for breaking down is present in present data transmission
When on the path of process, judge that the path that present data transmission passes through has failure；When the access link, network element that break down set
At least one of standby and MPLS tunnels are not present in when on the path of present data transmission process, judge that present data transmission is passed through
The path crossed does not exist failure.
In embodiments of the present invention, the second judge module 303 can be used for：
Determine the malfunction of the access link, network element device and MPLS tunnels on the path that present data transmission passes through,
Malfunction includes failure and non-failure；
According to the malfunction of access link, network element device and MPLS tunnels on the path that present data transmission passes through,
Determine fault type.
In embodiments of the present invention, processing module 304 can in the following way by data exchange to protection path LSP11
On be transmitted：
The MPLS label of data to be transmitted is substituted for Lable1+Lable3 by label Lable1+Lable2, Lable1 with
Service aisle PW1 correspondences, Lable2 is corresponding with active channel LSP1, and Lable3 is corresponding with protection path LSP11；
Send the data to be transmitted after tag replacement.
In embodiments of the present invention, processing module 304 can in the following way by data exchange to protection passage PW2
It is transmitted：
The MPLS label of data to be transmitted is substituted for Lable4+Lable5 by label Lable1+Lable2, Lable4 with
Protection passage PW2 correspondences, Lable5 is corresponding with active channel LSP2；
Send the data to be transmitted after tag replacement.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all it is of the invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (10)
1. a kind of Packet Transport Network, it is characterised in that the Packet Transport Network includes：
First network element device, the second network element device, the 3rd network element device and user network boundary device, first network element device
It is connected with second network element device by the first multiprotocol label switching MPLS tunnels, first network element device passes through second
MPLS tunnels are connected with the 3rd network element device, and second network element device and the 3rd network element device are connected, and described the
Two network element devices are connected by the first access link with the user network boundary device, and the 3rd network element device passes through second
Access link is connected with the user network boundary device；
Service aisle PW1, first network element device are configured between first network element device and second network element device
Protection passage PW2 is configured with and the 3rd network element device between；
The service aisle PW1 is carried on the active channel configured between first network element device and second network element device
On LSP1, or, the service aisle PW1 is carried on first network element device, the 3rd network element device and described second
On the protection path LSP11 configured between network element device；
The protection passage PW2 is carried on the active channel configured between first network element device and the 3rd network element device
On LSP2, or, the protection passage PW2 is carried on first network element device, second network element device and the described 3rd
On the protection path LSP22 configured between network element device.
2. a kind of Packet Transport Network guard method, it is characterised in that performed as the first network element device described in claim 1, institute
The method of stating includes：
Obtain fault message；
Judge that the path that present data transmission passes through whether there is failure according to the fault message；
When the path that present data transmission passes through has failure, failure judgement type, the fault type includes that first accesses
At least one in link failure, the second network element device failure, a MPLS tunnel failures, or the fault type includes the
At least one in two access link faults, the 3rd network element device failure, the 2nd MPLS tunnel failures；
When being carried out data transmission using service aisle PW1, if fault type is a MPLS tunnel failures, by number
It is transmitted according to being switched on the protection path LSP11；If the fault type includes first access link fault
Or the second network element device failure, then will be transmitted on data exchange to the protection passage PW2；
When being carried out data transmission using service aisle PW2, if fault type is the 2nd MPLS tunnel failures, by number
It is transmitted according to being switched on the protection path LSP22；If fault type is second access link fault or described
3rd network element device failure, then will be transmitted on data exchange to the protection passage PW1.
3. method according to claim 2, it is characterised in that the acquisition fault message, including：
Receive the Client Signal Fail CSF message that second network element device or the 3rd network element device send, the CSF reports
Text includes the port event linked between second network element device or the 3rd network element device and the user network boundary device
Barrier information；Or,
The fault message of second network element device or the 3rd network element device is obtained by operation management maintainance OAM mechanism；
Or,
The first MPLS tunnels or the 2nd MPLS tunnel failure information are obtained by OAM mechanism.
4. method according to claim 2, it is characterised in that described that present data transmission is judged according to the fault message
The path of process whether there is failure, including：
At least one of access link, network element device and MPLS tunnels for determining to break down according to the fault message；
At least one of access link, network element device and MPLS tunnels broken down described in judging whether there is in current number
According on the path being transferred through；
When at least one of the access link for breaking down, network element device and MPLS tunnels are present in the current data
When on the path being transferred through, judge that the path that the present data transmission passes through has failure；When it is described break down connect
At least one of incoming link, network element device and MPLS tunnels are not present in when on the path that the present data transmission passes through,
Judge that the path that the present data transmission passes through does not exist failure.
5. method according to claim 4, it is characterised in that the failure judgement type, including：
Determine the malfunction of the access link, network element device and MPLS tunnels on the path that the present data transmission passes through,
The malfunction includes failure and non-failure；
According to the malfunction of access link, network element device and MPLS tunnels on the path that the present data transmission passes through,
Determine the fault type.
6. method according to claim 2, it is characterised in that described by data exchange to the protection path LSP11
It is transmitted, including：
The multiprotocol label switching MPLS label of data to be transmitted is substituted for Lable1+ by label Lable1+Lable2
Lable3, the Lable1 are corresponding with the service aisle PW1, and the Lable2 is corresponding with the active channel LSP1, described
Lable3 is corresponding with the protection path LSP11；
Send the data to be transmitted after tag replacement；
It is described to be transmitted on data exchange to the protection passage PW2, including：
The MPLS label of data to be transmitted is substituted for Lable4+Lable5 by label Lable1+Lable2, the Lable4 with
The protection passage PW2 correspondences, the Lable5 is corresponding with the active channel LSP2；
Send the data to be transmitted after tag replacement.
7. a kind of network element device, it is characterised in that the network element device is the first net in Packet Transport Network described in claim 1
Element device, the network element device includes：
Acquisition module, for obtaining fault message；
First judge module, for judging that the path that present data transmission passes through whether there is failure according to the fault message；
Second judge module, when there is failure in the path for passing through when present data transmission, failure judgement type, the failure
Type includes at least one in the first access link fault, the second network element device failure, a MPLS tunnel failures, Huo Zhesuo
Stating fault type includes at least one in the second access link fault, the 3rd network element device failure, the 2nd MPLS tunnel failures；
Processing module, for when being carried out data transmission using service aisle PW1, if fault type is a MPLS tunnels
Road failure, then will be transmitted on data exchange to the protection path LSP11；If the fault type includes described first
Access link fault or the second network element device failure, then will be transmitted on data exchange to the protection passage PW2；
When being carried out data transmission using service aisle PW2, if fault type is the 2nd MPLS tunnel failures, by number
It is transmitted according to being switched on the protection path LSP22；If fault type is second access link fault or described
3rd network element device failure, then will be transmitted on data exchange to the protection passage PW1.
8. network element device according to claim 7, it is characterised in that the acquisition module, is used for：
Receive the Client Signal Fail CSF message that second network element device or the 3rd network element device send, the CSF reports
Text includes the port event linked between second network element device or the 3rd network element device and the user network boundary device
Barrier information；Or,
The fault message of second network element device or the 3rd network element device is obtained by operation management maintainance OAM mechanism；
Or,
The first MPLS tunnels or the 2nd MPLS tunnel failure information are obtained by OAM mechanism.
9. network element device according to claim 7, it is characterised in that first judge module, is used for：
At least one of access link, network element device and MPLS tunnels for determining to break down according to the fault message；
At least one of access link, network element device and MPLS tunnels broken down described in judging whether there is in current number
According on the path being transferred through；
When at least one of the access link for breaking down, network element device and MPLS tunnels are present in the current data
When on the path being transferred through, judge that the path that the present data transmission passes through has failure；When it is described break down connect
At least one of incoming link, network element device and MPLS tunnels are not present in when on the path that the present data transmission passes through,
Judge that the path that the present data transmission passes through does not exist failure.
10. network element device according to claim 9, it is characterised in that second judge module, is used for：
Determine the malfunction of the access link, network element device and MPLS tunnels on the path that the present data transmission passes through,
The malfunction includes failure and non-failure；
According to the malfunction of access link, network element device and MPLS tunnels on the path that the present data transmission passes through,
Determine the fault type.
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