CN105591800A - Traffic protection method and device - Google Patents
Traffic protection method and device Download PDFInfo
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- CN105591800A CN105591800A CN201510454471.4A CN201510454471A CN105591800A CN 105591800 A CN105591800 A CN 105591800A CN 201510454471 A CN201510454471 A CN 201510454471A CN 105591800 A CN105591800 A CN 105591800A
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/22—Alternate routing
Abstract
The invention provides a traffic protection method and a traffic protection device, which are applied to a CE dual-homing asymmetric accessed PWE3 network. The traffic protection method comprises the steps of: creating a bypass PW between two PE which are accessed by a CE in a dual-homing manner; with regard to any PE accessed by the CE in a dual-homing manner, sending a message to a CE through an AC when the access circuit AC between the PE and the CE takes effect and the PE receives the message from a PW connected with the PE; and sending the message via the connected with the PE when the AC between the PE and the CE fails and the PE receives the message from the PW connected with the PE, so that the message is sent to the CE through the other PE accessed by the CE in a dual-homing manner. The traffic protection method and the traffic protection device accelerate the service convergence speed during AC failure.
Description
Technical field
The application relates to traffic forwarding technical field, relates in particular to CE (CustomerEdge, Yong HubianEdge equipment) PWE3 (PseudoWireEmulationEdge-to-Edge, the limit of the asymmetric access of dual homedEdge is to the pseudo wire emulation at edge) flow rate protecting method in networking.
Background technology
PWE3 has been widely used in next generation mobile networks. In network design for VPN (VirtualPrivateNetwork, VPN) business often has very high reliability requirement. PWE3 reliability sideCase is mainly used in mobile bearer network or broadband access network, by PW (PseudoWire, pseudo-line)(AccessCircuit connects for link, PE (ProviderEdge, provider edge equipment) node and ACEntering circuit) protection of link realizes the reliability of network. There are at present a large amount of fast detecting and protection to switchTechnology, as BFD (BidirectionalForwardingDetection, two-way converting detects), OAM(OperationAdministrationandMaintenance, operation management maintain), FRR (FastReroute, fast heavy-route) etc. But these technology are all for PSN (PacketSwitchedNetwork, packet switching network) inner link or node failure provide high reliability mechanism, forAC link between PE node or PE node and CE node breaks down, helpless.
Existing PWE3 networking mode mainly contains two kinds:
One, the symmetrical access of CE dual homed networking
Under this networking mode, the symmetrical access of CE dual homed PE, is a kind of common deployment redundancy PW'sNetworking, refers to all dual homed access PE of two CE by PSN network interworking. Between CE, have like thisArticle two, communication path. Wherein, one as primary path, and another is as backup path, bearer networkIn realize PW business transparent transmission end to end, as shown in Figure 1. This networking is generally used in PW two ends canAll low by property time, back up by path redundancy, reach the object of protection business.
Two, the asymmetric access networking of CE dual homed
Under this networking mode, the asymmetric access of CE dual homed PE, is also a kind of common deployment redundancy PWNetworking, refer to two CE by PSN network interworking, access PE is singly returned in one end, the other end is twoReturn access PE. Be mainly used in and in bearer network, realize PW business transparent transmission end to end. As shown in Figure 2,CE1 is used for access user equipment, thereby and singly returns access PE1 that business datum is accessed to PSN network.PSN network design redundancy PW provide the protection to PW. CE2 dual homed access PE2 and PE3, pass throughWhich bar AC link aggregating algorithm is determined from receives message. Dual homed side can provide higher reliability, because ofThis general CE2 is the equipment such as BAS Broadband Access Server or base station controller. This networking plan is generally used inWhen PW has one end reliability higher, in the good situation of CE1/PE1 end reliability in Fig. 2,In order to reduce costs, can use the single normalizing end dual homed access networking of this one end.
In above-mentioned two kinds of network designs mentioning, there is obvious shortcoming:
One, in the symmetrical access of CE dual homed networking, standby path is to be used for carrying industry under normal circumstancesBusiness is a kind of waste to bandwidth; And may have more complicated network between PE, if PEBetween fault, need to feed back to CE end points and carry out the switching of AC active-standby path. Can not be in trouble pointRepair in time. Business convergence is bad. And compare asymmetric networking, need more PE.
Two, in the asymmetric access networking of CE dual homed, if there is equally dual homed side AC or PE faultTime, need to feed back to and singly return side PE to carry out the active and standby switching of PW, and in actual applications, many when existingWhen individual tenant, the corresponding a pair of active and standby PW of each tenant, but can only enter every couple of active and standby PW successivelyRow switches separately, and convergence time is larger equally, and business packet loss is higher.
Summary of the invention
The embodiment of the present application provides flow rate protecting method and device.
The application's technical scheme is achieved in that
A kind of flow rate protecting method, is applied to the edge-to-edge of the asymmetric access of customer edge CE dual homedIn pseudo wire emulation PWE3 networking, between two provider edge equipment PE of CE dual homed access, create bypassPseudo-line PW, the method comprises:
Arbitrary PE for described CE dual homed access:
When place in circuit AC between this PE and described CE comes into force, when this PE from self connect PWWhile receiving message, message is sent to described CE by described AC;
When described AC fault between this PE and described CE, the PW connecting from self as this PE connectsWhile receiving message, the bypass PW that message is connected from self sends, to make: message is two by described CEReturn another PE of access to send to described CE.
When AC between this PE and described CE comes into force, described method also comprises:
The bypass PW connecting from self as this PE while receiving message, sends to message by described ACDescribed CE;
When described AC fault between this PE and described CE, described method also comprises:
The bypass PW connecting from self as this PE is while receiving message, and the PW that message is connected from self sends outGo out.
Described method further comprises:
Arbitrary PE for described CE dual homed access:
In the time that the described AC between this PE discovery self and described CE comes into force, this PE is by first group of list itemContent be set to: AC interface comes into force, and the public network label switching protocol LSP of bypass PW does not come into force;
When described AC between this PE and described CE comes into force, the PW connecting from self as this PE connectsWhile receiving message, send to described CE to comprise by described AC message:
The PW that this PE connects from self receives multiprotocol label switching MPLS message, ejects this messageOuter layer label, finds that the content of first group of list item is: AC interface comes into force, and the public network LSP of bypass PW is notCome into force, eject the PW label of the internal layer of this message, message is sent from described AC.
Described method further comprises:
In the time that this PE finds the described AC fault between self and described CE, by the content of first group of list itemBe set to: AC interface does not come into force, the public network LSP of bypass PW comes into force;
And, when described described AC fault between this PE and described CE, when this PE connects from selfPW while receiving message, the bypass PW that message is connected from self sends and comprises:
The PW that this PE connects from self receives MPLS message, ejects the outer layer label of this message, findsThe content of first group of list item is: AC interface does not come into force, and the public network LSP of bypass PW comes into force, by this reportThe PW label of the internal layer of literary composition is exchanged for the label of the bypass PW self connecting, and message is connected from selfBypass PW sends.
Described method further comprises:
Arbitrary PE for described CE dual homed access:
In the time that the described AC between this PE discovery self and described CE comes into force, this PE is by second group of list itemContent be set to: AC interface comes into force, and the public network LSP of PW does not come into force, and,
The bypass PW connecting from self as this PE while receiving MPLS message, ejects the skin mark of this messageSign, find that the content of second group of list item is: AC interface comes into force, and the public network LSP of PW does not come into force, ejectThe bypass PW label of the internal layer of this message, sends message from described AC.
Described method further comprises:
In the time that this PE finds the described AC fault between self and described CE, by the content of second group of list itemBe set to: AC interface does not come into force, the public network LSP of PW comes into force, and,
The bypass PW connecting from self as this PE while receiving MPLS message, ejects the skin mark of this messageSign, find that the content of second group of list item is: AC interface does not come into force, and the public network LSP of PW comes into force, and shouldThe bypass PW label of the internal layer of message is exchanged for the label of the PW self connecting, and message is connected from selfPW send.
When described AC fault between this PE and described CE, this PE sends AC fault to far-end PENotice, to make: far-end PE is switched to flow standby PW from main PW.
A kind of flow rate protective device, is arranged on the PE of PWE3 networking of the asymmetric access of CE dual homed, shouldBetween another PE of PE and the access of described CE dual homed, have bypass PW, this device comprises:
The AC forwarding module that comes into force: when the AC between this PE and described CE comes into force, when connecting from this PEPW while receiving message, message is sent to described CE by described AC;
AC fault forwarding module: when described AC fault between this PE and described CE, when from this PEWhen the PW connecting receives message, the bypass PW that message is connected from this PE sends, to make: messageAnother PE by described CE dual homed access sends to described CE.
The described AC forwarding module that comes into force is further used for,
When AC between this PE and described CE comes into force, when the bypass PW connecting from this PE receivesWhen message, message is sent to described CE by described AC;
Described AC fault forwarding module is further used for,
When described AC fault between this PE and described CE, when the bypass PW connecting from this PE connectsWhile receiving message, the PW that message is connected from this PE sends.
Described device further comprises: first group of list item maintenance module, find this PE and described CE for working asBetween described AC while coming into force, the content of first group of list item is set to: AC interface comes into force, bypass PWPublic network LSP do not come into force;
Described AC comes into force the AC of forwarding module between this PE and described CE while coming into force, when from this PEWhen the PW connecting receives message, send to described CE to comprise by described AC message:
The PW connecting from this PE receives MPLS message, ejects the outer layer label of this message, finds firstThe content of group list item is: AC interface comes into force, and the public network LSP of bypass PW does not come into force, and ejects this messageThe PW label of internal layer, message is sent from described AC.
Described first group of list item maintenance module is further used for,
When find between this PE and described CE described AC fault time, by the content setting of first group of list itemFor: AC interface does not come into force, and the public network LSP of bypass PW comes into force;
And, when the described AC fault of described AC fault forwarding module between this PE and described CE, whenWhen the PW connecting from this PE receives message, the bypass PW that message is connected from this PE sends and comprises:
The PW connecting from this PE receives MPLS message, ejects the outer layer label of this message, finds firstThe content of group list item is: AC interface does not come into force, and the public network LSP of bypass PW comes into force, by this messageThe PW label of internal layer is exchanged for the label of the bypass PW of this PE connection, the side that message is connected from this PERoad PW sends.
Described device further comprises: second group of list item maintenance module, find this PE and described CE for working asBetween described AC while coming into force, the content of second group of list item is set to: AC interface comes into force, the public affairs of PWNet LSP does not come into force, and,
The described AC forwarding module that comes into force is further used for,
In the time that the bypass PW connecting from this PE receives MPLS message, eject the outer layer label of this message,The content of finding second group of list item is: AC interface comes into force, and the public network LSP of PW does not come into force, and ejects this reportThe bypass PW label of the internal layer of literary composition, sends message from described AC.
Described second group of list item maintenance module is further used for,
When find between this PE and described CE described AC fault time, by the content setting of second group of list itemFor: AC interface does not come into force, and the public network LSP of PW comes into force, and,
Described AC fault forwarding module is further used for, when the bypass PW connecting from this PE receives MPLSWhen message, eject the outer layer label of this message, find that the content of second group of list item is: AC interface does not come into force,The public network LSP of PW comes into force, and the bypass PW label of the internal layer of this message is exchanged for to this PE connectsThe label of PW, the PW that message is connected from this PE sends.
Described device further comprises, AC signalling trouble module, between this PE and described CEDescribed AC fault time, send AC signalling trouble to far-end PE, to make: far-end PE is by flowBe switched to standby PW from main PW.
Visible, in the embodiment of the present application, by creating bypass between two PE in the access of CE dual homedPW, in the time of AC fault between PE and CE, PE turns the flow from PW by bypass PWIssue another PE of CE dual homed access, another PE again by traffic forwarding to CE, thereby in AC faultTime, reduce the packet loss phenomenon in flow switch process, accelerate business convergence speed.
Brief description of the drawings
Fig. 1 is the exemplary plot of the symmetrical networking of existing CE dual homed;
Fig. 2 is the exemplary plot of the asymmetric networking of existing CE dual homed;
Flow in the PWE3 networking of the asymmetric access of CE dual homed that Fig. 3 provides for the embodiment of the present applicationGuard method flow chart;
Fig. 4 is the PWE3 networking diagram of the asymmetric access of CE dual homed in the application's application example;
Fig. 5-1 is in the application's application example, when AC1 comes into force, and the group prefix of PW11, PW12Incidence relation schematic diagram with group11 list item;
Fig. 5-2 are in the application's application example, when AC1 comes into force, and the group of bypass PW1, bypass PW2The incidence relation schematic diagram of prefix and group12 list item;
Fig. 6-1 is in the application's application example, when AC2 comes into force, and the group prefix of PW11, PW12Incidence relation schematic diagram with group11 list item;
Fig. 6-2 are in the application's application example, when AC2 comes into force, and the group of bypass PW1, bypass PW2The incidence relation schematic diagram of prefix and group12 list item;
The composition schematic diagram of the flow rate protective device that Fig. 7 provides for the embodiment of the present application.
Detailed description of the invention
Below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.
Flow in the PWE3 networking of the asymmetric access of CE dual homed that Fig. 3 provides for the embodiment of the present applicationGuard method flow chart, its concrete steps are as follows:
Step 301: for each tenant, create respectively a bypass between two PE of CE dual homed accessPW。
Set: in the PWE3 networking of the asymmetric access of CE dual homed, CE dual homed access the one PE andThe 2nd PE, now, if having the individual tenant of m (m is greater than 1 integer), a PE, the 2nd PEConnect respectively m bar PW, every corresponding tenant of PW, wherein, the m article that a PE connectsThe m article of PW that PW is connected with the 2nd PE backups each other, and between a PE and the 2nd PE, creates mBar bypass PW, every corresponding tenant of bypass PW.
Step 302: the arbitrary PE for the access of CE dual homed: the AC between this PE and this CE comes into forceTime, the PW connecting from self as this PE while receiving message, sends to this CE by message by this AC.
Step 303: the arbitrary PE for the access of CE dual homed: the AC fault between this PE and this CETime, the PW connecting from self as this PE is while receiving message, and the bypass PW that message is connected from self sends outGo out, to make: message sends to this CE by another PE of this CE dual homed access.
In a kind of embodiment, the arbitrary PE for the access of CE dual homed: the AC between this PE and this CEWhile coming into force, the bypass PW connecting from self as this PE while receiving message, sends message by this ACGive this CE.
In a kind of embodiment, the arbitrary PE for the access of CE dual homed: the AC between this PE and this CEWhen fault, the bypass PW connecting from self as this PE while receiving message, connects message from selfPW sends.
In a kind of embodiment, the arbitrary PE for the access of CE dual homed: what this PE connected for self in advance appointsOne PW, the group prefix that configures this PW is: (eject the label of this PW, be exchanged for the side that this PW is correspondingThe label of road PW); And the group prefix of all PW that self is connected is associated with first group of list item, and,
In the time that the AC between this PE discovery self and this CE comes into force, this PE is by the content of first group of list itemBe set to: (AC interface comes into force, and the public network LSP of bypass PW does not come into force);
And, in step 302, when the AC between this PE and this CE comes into force, when this PE connects from selfWhen the PW connecing receives message, send to this CE to comprise by this AC message:
This PE from self connect PW receive MPLS (Multi-ProtocolLabelSwitching, manyProtocol label exchange) message, eject the outer layer label of this message, find the group prefix association of this PWFirst group of list item, finds that the content of this first group of list item is: (AC interface comes into force, the public network LSP of bypass PWDo not come into force), the Section 1 content of first group of list item comes into force, and carries out in the Section 1 of group prefix of this PWHold: eject the PW label of the internal layer of this message, message is sent from this AC.
The relation of the group prefix of first group of list item and PW is as follows:
When the Section 1 content of first group of list item comes into force, when AC interface comes into force, the group prefix of execution PWSection 1 content, ejects the label of this PW; When the Section 2 content of first group of list item comes into force, i.e. bypassWhen the public network LSP of PW comes into force, carry out the Section 2 content of the group prefix of PW, be exchanged for this PW coupleThe label of the bypass PW answering.
In a kind of embodiment, the arbitrary PE for the access of CE dual homed: what this PE connected for self in advance appointsOne bypass PW, the group prefix that configures this bypass PW is: (label that ejects this bypass PW, is exchanged for thisThe label of the PW that bypass PW is corresponding); And the group prefix of all bypass PW that self is connected and second groupList item association, and,
In the time that the AC between this PE discovery self and this CE comes into force, this PE is by the content of second group of list itemBe set to: (AC interface comes into force, and the public network LSP of PW does not come into force), and,
The bypass PW connecting from self as this PE while receiving MPLS message, ejects the skin mark of this messageSign, find second group of list item of the group prefix association of this bypass PW, find that the content of second group of list item is:(AC interface comes into force, and the public network LSP of PW does not come into force), the Section 1 content of second group of list item comes into force,Carry out the Section 1 content of the group prefix of this bypass PW: eject the bypass PW label of the internal layer of this message,Message is sent from this AC.
The relation of the group prefix of second group of list item and bypass PW is as follows:
When the Section 1 content of second group of list item comes into force, when AC interface comes into force, carry out before the group of bypass PWThe Section 1 content of sewing, ejects the label of this bypass PW; When the Section 2 content of second group of list item comes into force,Be the public network LSP of PW while coming into force, carry out the Section 2 content of the group prefix of bypass PW, be exchanged for thisThe label of the PW that bypass PW is corresponding.
In a kind of embodiment, in the time that this PE finds the AC fault between self and this CE, by first group of tableThe content modification of item is: (AC interface does not come into force, and the public network LSP of bypass PW comes into force);
And, in step 303, when AC fault between this PE and this CE, when this PE connects from selfWhen the PW connecing receives message, the bypass PW that message is connected from self sends and comprises:
The PW that this PE connects from self receives MPLS message, ejects the outer layer label of this message, searchesArrive first group of list item of the group prefix association of this PW, find that the content of this first group of list item is: (AC interfaceDo not come into force, the public network LSP of bypass PW comes into force), carry out the Section 2 content of the group prefix of this PW: willThe PW label of the internal layer of this message is exchanged for the label of the bypass PW that this PW is corresponding, by message from this PWCorresponding bypass PW sends.
In a kind of embodiment, in the time that this PE finds the AC fault between self and this CE, by second group of tableThe content modification of item is: (AC interface does not come into force, and the public network LSP of PW comes into force), and,
The bypass PW connecting from self as this PE while receiving MPLS message, ejects the skin mark of this messageSign, find second group of list item of the group prefix association of this bypass PW, find the content of this second group of list itemFor (AC interface does not come into force, and the public network LSP of PW comes into force), carry out this bypass PW group prefixBinomial content: the mark that the bypass PW label of the internal layer of this message is exchanged for to the PW that this bypass PW is correspondingSign, message is sent from PW corresponding to this bypass PW.
In a kind of embodiment, in the time that this PE finds the AC fault between self and this CE, this PE is to farEnd PE sends AC signalling trouble, to make: far-end PE is switched to flow standby PW from main PW.
Below provide the application's application example:
Taking the PWE3 networking of the asymmetric access of CE dual homed shown in Fig. 4 as example, wherein:
The access of CE2 dual homed PE2, PE3; Between CE2 and PE2, be connected CE2 and PE3 by AC1Between connect by AC2; AC1, AC2 backup each other;
If have at present two tenants:
1) between PE1, PE2, created two PW:PW11, PW12, the corresponding tenant 1 of difference,Tenant 2;
2) between PE1, PE3, created two PW:PW21, PW22, the corresponding tenant 1 of difference,Tenant 2;
Wherein, PW11, PW21 backup each other, and PW12, PW22 backup each other.
In the embodiment of the present application, between PE2 and PE3, create respectively a bypass for each tenantPW, creates respectively bypass PW1, bypass PW2 for tenant 1, tenant 2.
Step 01: when initial, CE2 determines AC1 come into force (AC1 becomes main AC) according to preset algorithm,AC2 do not come into force (AC2 become standby AC); Accordingly, the PW11 between PE1, PE2, PW12Come into force, become main PW, PW21, PW22 between PE1, PE3 do not come into force, and become standby PW.
When initial, group (group) prefix that PE2 generates PW11, PW12 is as follows:
The group prefix (eject the label of PW11, be exchanged for the label of bypass PW1) of PW11;
The group prefix (eject the label of PW12, be exchanged for the label of bypass PW2) of PW12;
And the group prefix of PW11, PW12 is simultaneously associated with group11 list item;
When initial, in the time of AC1 interface up, the content of PE2 group11 list item is set to: (AC1Interface comes into force, and the public network LSP of bypass PW does not come into force), now, before the group of PW11, PW12Sew with the incidence relation of group11 list item as shown in Fig. 5-1;
Meanwhile, the group prefix of PE2 generation bypass PW1, bypass PW2 is as follows:
The group prefix (eject the label of bypass PW1, be exchanged for the label of PW11) of bypass PW1;
The group prefix (eject the label of bypass PW2, be exchanged for the label of PW12) of bypass PW2;
And the group prefix of bypass PW1, bypass PW2 is simultaneously associated with group12 list item;
When initial, in the time of AC1 interface up, the content of PE2 group12 list item is set to: (AC1Interface comes into force, and the public network LSP of PW does not come into force), now, the group prefix of bypass PW1, PW2With the incidence relation of group12 list item as shown in Fig. 5-2.
Step 02: when initial, the group prefix that PE3 generates PW21, PW22 is as follows:
The group prefix (eject the label of PW21, be exchanged for the label of bypass PW1) of PW21;
The group prefix (eject the label of PW22, be exchanged for the label of bypass PW2) of PW22;
And the group prefix of PW21, PW22 is simultaneously associated with group21 list item;
When initial, due to AC2 interface down, the content of PE2 group21 list item is set to:(AC2 interface does not come into force, and the public network LSP of bypass PW comes into force);
Meanwhile, the group prefix of PE3 generation bypass PW1, bypass PW2 is as follows:
The group prefix (eject the label of bypass PW1, be exchanged for the label of PW21) of bypass PW1;
The group prefix (eject the label of bypass PW2, be exchanged for the label of PW22) of bypass PW2;
And by associated with group22 list item the group prefix of bypass PW1, bypass PW2;
When initial, due to AC2 interface down, the content of PE2 group22 list item is set to:(AC2 interface does not come into force, and the public network LSP of PW comes into force).
Step 03: after this (in the time that AC1 interface comes into force, AC2 interface does not come into force), when PE2 fromWhen PW11 receives MPLS message, eject the outer layer label of message, then search PW11 associationGroup11 list item, finds that group11 list item is: (AC1 interface comes into force, the public network LSP of bypass PWDo not come into force), the Section 1 content of list item comes into force, and message is carried out the group prefix of PW11Section 1 content: eject the label of the PW11 of message internal layer, then message is sent out from AC1 interfaceGo;
Similarly, in the time that PE2 receives MPLS message from PW12, eject the outer layer label of message,Then search the group11 list item of PW12 association, find that group11 list item is: (AC1 interface is rawEffect, the public network LSP of bypass PW does not come into force), the Section 1 content of list item comes into force, and message is heldThe Section 1 content of the group prefix of row PW12: eject the label of the PW12 of message internal layer, thenMessage is sent from AC1 interface;
In the time that PE2 receives MPLS message from bypass PW1, eject the outer layer label of message, thenSearch the group12 list item of bypass PW1 association, find that group12 list item is: (AC1 interface comes into force,The public network LSP of PW does not come into force), the Section 1 content of list item comes into force, and message is carried out to bypass PW1The Section 1 content of group prefix: eject the label of the bypass PW1 of message internal layer, then by messageSend from AC1 interface;
Similarly, in the time that PE2 receives MPLS message from bypass PW2, eject the skin mark of messageSign, then search the group12 list item of bypass PW2 association, find that group12 list item is: (AC1Interface comes into force, and the public network LSP of PW does not come into force), the Section 1 content of list item comes into force, to messageCarry out the Section 1 content of bypass PW2 prefix: eject the label of the bypass PW2 of message internal layer, thenMessage is sent from AC1 interface.
Step 04: after this (in the time that AC1 interface comes into force, AC2 interface does not come into force), when PE3 fromWhen PW21 receives MPLS message, eject the outer layer label of message, then search PW21 associationGroup21 list item, finds that group21 list item is: (AC2 interface does not come into force, the public network of bypass PWLSP comes into force), the Section 2 content of list item comes into force, and message is carried out the group prefix of PW21Section 2 content: the label of the PW21 of message internal layer is exchanged for to the bypass PW1 that PW21 is correspondingLabel, then message is sent from bypass PW1;
Similarly, in the time that PE3 receives MPLS message from PW22, eject the outer layer label of message,Then search the group21 list item of PW22 association, find that group21 list item is: (AC2 interface is notCome into force, the public network LSP of bypass PW comes into force), the Section 2 content of list item comes into force, and message is heldThe Section 2 content of the group prefix of row PW22: the label of the PW22 of message internal layer is exchanged forThe label of the bypass PW2 that PW22 is corresponding, then sends message from bypass PW2;
In the time that PE3 receives MPLS message from bypass PW1, eject the outer layer label of message, thenSearch the group22 list item of bypass PW1 association, find that group22 list item is: (AC2 interface is not rawEffect, the public network LSP of PW comes into force), the Section 2 content of list item comes into force, and message is carried out to bypassThe Section 2 content of the group prefix of PW1: the label of the bypass PW1 of message internal layer is exchanged for otherThe label of the PW21 that road PW1 is corresponding, then sends message from PW21;
Similarly, in the time that PE3 receives MPLS message from bypass PW2, eject the skin mark of messageSign, then search the group22 list item of bypass PW2 association, find that group22 list item is: (AC2Interface does not come into force, and the public network LSP of PW comes into force), the Section 2 content of list item comes into force, to messageCarry out the Section 2 content of the group prefix of bypass PW2: by the label of the bypass PW2 of message internal layerThe label that is exchanged for the PW22 that bypass PW2 is corresponding, then sends message from PW22.
In a certain moment, AC1 fault, after PE2 perceives, by group11, group12 list item respectively moreBe newly:
Group11 list item (AC1 interface does not come into force, and the public network LSP of bypass PW comes into force);
Group12 list item (AC1 interface does not come into force, and the public network LSP of PW comes into force);
It should be noted that, in the embodiment of the present application, the group prefix of all PW, bypass PW beginsRemain unchanged eventually, only have the content of group list item to change along with the variation of AC interface.
Now, the group prefix of PW11, PW12 and the incidence relation of group11 list item are as Fig. 6-1Shown in; The group prefix of bypass PW1, bypass PW2 and the incidence relation of group12 list item are as figureShown in 6-2;
Meanwhile, after CE2 perceives, can enable AC2, when PE3 perceives AC2 interface up, willGroup21, group22 list item are updated to respectively:
Group21 list item (AC2 interface comes into force, and the public network LSP of bypass PW does not come into force);
Group22 list item (AC2 interface comes into force, and the public network LSP of PW does not come into force).
Step 05: after this (in the time that AC1 interface does not come into force, AC2 interface comes into force), when PE2 fromWhen PW11 receives MPLS message, eject the outer layer label of message, then search PW11 associationGroup11 list item, finds that group11 list item is: (AC1 interface does not come into force, the public network of bypass PWLSP comes into force), the Section 2 content of list item comes into force, and message is carried out the group prefix of PW11Section 2 content: the label of the PW11 of message internal layer is exchanged for to the bypass PW1 that PW11 is correspondingLabel, then message is sent from bypass PW1;
Similarly, in the time that PE2 receives MPLS message from PW12, eject the outer layer label of message,Then search the group11 list item of PW12 association, find that group11 list item is: (AC1 interface is notCome into force, the public network LSP of bypass PW comes into force), the Section 2 content of list item comes into force, and message is heldThe Section 2 content of the group prefix of row PW12: the label of the PW12 of message internal layer is exchanged forThe label of the bypass PW2 that PW12 is corresponding, then sends message from bypass PW2;
In the time that PE2 receives MPLS message from bypass PW1, eject the outer layer label of message, thenSearch the group12 list item of bypass PW1 association, find that group12 list item is: (AC1 interface is not rawEffect, the public network LSP of PW comes into force), the Section 2 content of list item comes into force, and message is carried out to bypassThe Section 2 content of the group prefix of PW1: the label of the bypass PW1 of message internal layer is exchanged for otherThe label of the PW11 that road PW1 is corresponding, then sends message from PW11;
Similarly, in the time that PE2 receives MPLS message from bypass PW2, eject the skin mark of messageSign, then search the group12 list item of bypass PW2 association, find that group12 list item is: (AC1Interface does not come into force, and the public network LSP of PW comes into force), the Section 2 content of list item comes into force, to messageCarry out the Section 2 content of the group prefix of bypass PW2: by the label of the bypass PW2 of message internal layerThe label that is exchanged for the PW12 that bypass PW2 is corresponding, then sends message from PW12.
Step 06: after this (in the time that AC1 interface does not come into force, AC2 interface comes into force), when PE3 fromWhen PW21 receives MPLS message, eject the outer layer label of message, then search PW21 associationGroup21 list item, finds that group21 list item is: (AC2 interface comes into force, the public network LSP of bypass PWDo not come into force), the Section 1 content of list item comes into force, and message is carried out the group prefix of PW21Section 1 content: eject the label of the PW21 of message internal layer, then message is sent out from AC2 interfaceGo;
Similarly, in the time that PE3 receives MPLS message from PW22, eject the outer layer label of message,Then search the group21 list item of PW22 association, find that group21 list item is: (AC2 interface is rawEffect, the public network LSP of bypass PW does not come into force), the Section 1 content of list item comes into force, and message is heldThe Section 1 content of the group prefix of row PW22: eject the label of the PW22 of message internal layer, thenMessage is sent from AC2 interface;
In the time that PE3 receives MPLS message from bypass PW1, eject the outer layer label of message, thenSearch the group22 list item of bypass PW1 association, find that group22 list item is: (AC2 interface comes into force,The public network LSP of PW does not come into force), the Section 1 content of list item comes into force, and message is carried out to bypass PW1The Section 1 content of group prefix: eject the label of the bypass PW1 of message internal layer, then by messageSend from AC2 interface;
Similarly, in the time that PE3 receives MPLS message from bypass PW2, eject the skin mark of messageSign, then search the group22 list item of bypass PW2 association, find that group22 list item is: (AC2Interface comes into force, and the public network LSP of PW does not come into force), the Section 1 content of list item comes into force, to messageCarry out the Section 1 content of bypass PW2 prefix: eject the label of the bypass PW2 of message internal layer, thenMessage is sent from AC2 interface.
Visible, when after AC1 fault, the upper flow from PW of PE2 has temporarily all been transferred to bypass PWUpper transmission, arrives PE3 by bypass PW, is forwarded to CE2 again, by PE3 by AC2CE1—>PE1—>PE2—>PE3—>CE2。
It should be noted that, when after AC1 fault, after PE2 perceives, PE2 can pass through notify messageNotice PE1, PE1 just perceives the ACdown of opposite end PE like this, thereby by tenant 1,2 flowBe switched to PW21, PW22 from PW11, PW12, on PE1, carried out the active and standby switching of PW,Thereby final flow rate switches to: CE1-> PE1-> PE3-> CE2.
Visible, after AC1 fault, in the process of flow convergence, flow can temporarily be transferred to bypass PWUpper transmission, can not produce packet loss.
The composition schematic diagram of the flow rate protective device that Fig. 7 provides for the embodiment of the present application, it is two that this device is positioned at CEReturn the PE in the PWE3 networking of asymmetric access upper, between another PE that this PE and this CE dual homed accessHave bypass PW, this device mainly comprises:
The AC forwarding module 71 that comes into force: when the AC between this PE and this CE comes into force, when connecting from this PEPW while receiving message, message is sent to this CE by this AC.
AC fault forwarding module 72: when described AC fault between this PE and this CE, when from this PEWhen the PW connecting receives message, the bypass PW that message is connected from this PE sends, to make: messageAnother PE by this CE dual homed access sends to this CE.
In a kind of embodiment, the AC forwarding module 71 that comes into force is further used for,
When AC between this PE and this CE comes into force, when the bypass PW connecting from this PE receives reportWen Shi, sends to this CE by message by this AC;
AC fault forwarding module 72 is further used for,
When AC fault between this PE and this CE, when the bypass PW connecting from this PE receives reportWen Shi, the PW that message is connected from this PE sends.
In a kind of embodiment, this device further comprises: first group of list item maintenance module, and for being somebody's turn to do when discoveryWhen AC between PE and this CE comes into force, the content of first group of list item is set to: (AC interface comes into force,The public network LSP of bypass PW does not come into force);
AC comes into force the AC of forwarding module 71 between this PE and this CE while coming into force, when connecting from this PEPW while receiving message, send to this CE to comprise by this AC message:
The PW connecting from this PE receives MPLS message, ejects the outer layer label of this message, finds firstThe content of group list item is: (AC interface comes into force, and the public network LSP of bypass PW does not come into force), eject this reportThe PW label of the internal layer of literary composition, sends message from this AC.
In a kind of embodiment, first group of list item maintenance module is further used for,
When find between this PE and this CE AC fault time, the content of first group of list item is set to: (ACInterface does not come into force, and the public network LSP of bypass PW comes into force);
And, when the AC fault of AC fault forwarding module 72 between this PE and this CE, when from this PEWhen the PW connecting receives message, the bypass PW that message is connected from this PE sends and comprises:
The PW connecting from this PE receives MPLS message, ejects the outer layer label of this message, finds firstThe content of group list item is: (AC interface does not come into force, and the public network LSP of bypass PW comes into force), and by this messageThe PW label of internal layer be exchanged for the label of the bypass PW that this PE connects, message is connected from this PEBypass PW sends.
In a kind of embodiment, this device further comprises: second group of list item maintenance module, and for being somebody's turn to do when discoveryWhen AC between PE and this CE comes into force, the content of second group of list item is set to: (AC interface comes into force,The public network LSP of PW does not come into force), and,
The AC forwarding module 71 that comes into force is further used for,
In the time that the bypass PW connecting from this PE receives MPLS message, eject the outer layer label of this message,The content of finding second group of list item is: (AC interface comes into force, and the public network LSP of PW does not come into force), ejecting shouldThe bypass PW label of the internal layer of message, sends message from this AC.
In a kind of embodiment, second group of list item maintenance module is further used for,
When find between this PE and this CE AC fault time, the content of second group of list item is set to: (ACInterface does not come into force, and the public network LSP of PW comes into force), and,
AC fault forwarding module 72 is further used for, when the bypass PW connecting from this PE receives MPLSWhen message, eject the outer layer label of this message, find that the content of second group of list item is: (AC interface does not come into force,The public network LSP of PW comes into force), the bypass PW label of the internal layer of this message is exchanged for to this PE connectsThe label of PW, the PW that message is connected from this PE sends.
In a kind of embodiment, this device further comprises, AC signalling trouble module, in this PE and instituteWhile stating the described AC fault between CE, send AC signalling trouble to far-end PE, to make: far-end PEFlow is switched to standby PW from main PW.
The foregoing is only the application's preferred embodiment, not in order to limit the application, all at thisWithin the spirit and principle of application, any amendment of making, be equal to replacement, improvement etc., all should be included inWithin the scope of the application's protection.
Claims (14)
1. a flow rate protecting method, the edge that is applied to the asymmetric access of customer edge CE dual homed arrivesIn edge pseudo-line simulation PWE3 networking, it is characterized in that, establish at two Provider Edges of CE dual homed accessBetween standby PE, create the pseudo-line PW of bypass, the method comprises:
Arbitrary PE for described CE dual homed access:
When place in circuit AC between this PE and described CE comes into force, when this PE from self connect PWWhile receiving message, message is sent to described CE by described AC;
When described AC fault between this PE and described CE, the PW connecting from self as this PE connectsWhile receiving message, the bypass PW that message is connected from self sends, to make: message is by described CEAnother PE of dual homed access sends to described CE.
2. method according to claim 1, is characterized in that, between this PE and described CEAC while coming into force, described method also comprises:
The bypass PW connecting from self as this PE while receiving message, sends message by described ACGive described CE;
When described AC fault between this PE and described CE, described method also comprises:
The bypass PW connecting from self as this PE is while receiving message, the PW that message is connected from selfSend.
3. method according to claim 1, is characterized in that, described method further comprises:
Arbitrary PE for described CE dual homed access:
In the time that the described AC between this PE discovery self and described CE comes into force, this PE is by first group of list itemContent be set to: AC interface comes into force, and the public network label switching protocol LSP of bypass PW does not come into force;
When described AC between this PE and described CE comes into force, the PW connecting from self as this PE connectsWhile receiving message, send to described CE to comprise by described AC message:
The PW that this PE connects from self receives multiprotocol label switching MPLS message, ejects this messageOuter layer label, find that the content of first group of list item is: AC interface comes into force, the public network LSP of bypass PWDo not come into force, eject the PW label of the internal layer of this message, message is sent from described AC.
4. according to the method described in claim 1 or 3, it is characterized in that, described method further comprises:
In the time that this PE finds the described AC fault between self and described CE, by the content of first group of list itemBe set to: AC interface does not come into force, the public network LSP of bypass PW comes into force;
And, when described described AC fault between this PE and described CE, when this PE connects from selfPW while receiving message, the bypass PW that message is connected from self sends and comprises:
The PW that this PE connects from self receives MPLS message, ejects the outer layer label of this message, sends outThe content of existing first group of list item is: AC interface does not come into force, and the public network LSP of bypass PW comes into force, and shouldThe PW label of the internal layer of message is exchanged for the label of the bypass PW self connecting, and message is connected from selfBypass PW send.
5. method according to claim 1, is characterized in that, described method further comprises:
Arbitrary PE for described CE dual homed access:
In the time that the described AC between this PE discovery self and described CE comes into force, this PE is by second group of list itemContent be set to: AC interface comes into force, and the public network LSP of PW does not come into force, and,
The bypass PW connecting from self as this PE while receiving MPLS message, ejects the skin of this messageLabel, finds that the content of second group of list item is: AC interface comes into force, and the public network LSP of PW does not come into force,The bypass PW label that ejects the internal layer of this message, sends message from described AC.
6. method according to claim 1 or 5, is characterized in that, described method further comprises:
In the time that this PE finds the described AC fault between self and described CE, by the content of second group of list itemBe set to: AC interface does not come into force, the public network LSP of PW comes into force, and,
The bypass PW connecting from self as this PE while receiving MPLS message, ejects the skin of this messageLabel, finds that the content of second group of list item is: AC interface does not come into force, and the public network LSP of PW comes into force,The bypass PW label of the internal layer of this message is exchanged for to the label of PW self connecting, by message from selfThe PW connecting sends.
7. method according to claim 1, is characterized in that, between this PE and described CEWhen described AC fault, this PE sends AC signalling trouble to far-end PE, to make: far-end PE will flowAmount is switched to standby PW from main PW.
8. a flow rate protective device, is arranged on the PE of PWE3 networking of the asymmetric access of CE dual homed,It is characterized in that thering is bypass PW, this device between this PE and another PE of described CE dual homed accessComprise:
The AC forwarding module that comes into force: when the AC between this PE and described CE comes into force, when connecting from this PEWhen the PW connecing receives message, message is sent to described CE by described AC;
AC fault forwarding module: when described AC fault between this PE and described CE, when from this PEWhen the PW connecting receives message, the bypass PW that message is connected from this PE sends, to make: reportLiterary composition sends to described CE by another PE of described CE dual homed access.
9. device according to claim 8, is characterized in that, the described AC forwarding module that comes into forceBe further used for,
When AC between this PE and described CE comes into force, when the bypass PW connecting from this PE receivesWhen message, message is sent to described CE by described AC;
Described AC fault forwarding module is further used for,
When described AC fault between this PE and described CE, when the bypass PW connecting from this PE connectsWhile receiving message, the PW that message is connected from this PE sends.
10. device according to claim 8, is characterized in that, described device further comprises: theOne group of list item maintenance module, in the time finding that described AC between this PE and described CE comes into force, by theThe content of one group of list item is set to: AC interface comes into force, and the public network LSP of bypass PW does not come into force;
Described AC comes into force the AC of forwarding module between this PE and described CE while coming into force, when from this PEWhen the PW connecting receives message, send to described CE to comprise by described AC message:
The PW connecting from this PE receives MPLS message, ejects the outer layer label of this message, finds theThe content of one group of list item is: AC interface comes into force, and the public network LSP of bypass PW does not come into force, and ejects this reportThe PW label of the internal layer of literary composition, sends message from described AC.
Device described in 11. according to Claim 8 or 10, is characterized in that, described first group of list item dimensionProtect module and be further used for,
When find between this PE and described CE described AC fault time, by the content setting of first group of list itemFor: AC interface does not come into force, and the public network LSP of bypass PW comes into force;
And, when the described AC fault of described AC fault forwarding module between this PE and described CE, whenWhen the PW connecting from this PE receives message, the bypass PW that message is connected from this PE sends and comprises:
The PW connecting from this PE receives MPLS message, ejects the outer layer label of this message, finds theThe content of one group of list item is: AC interface does not come into force, and the public network LSP of bypass PW comes into force, by this messageThe PW label of internal layer be exchanged for the label of the bypass PW that this PE connects, message is connected from this PEBypass PW sends.
12. devices according to claim 8, is characterized in that, described device further comprises: theTwo groups of list item maintenance modules, in the time finding that described AC between this PE and described CE comes into force, by theThe content of two groups of list items is set to: AC interface comes into force, and the public network LSP of PW does not come into force, and,
The described AC forwarding module that comes into force is further used for,
In the time that the bypass PW connecting from this PE receives MPLS message, eject the outer layer label of this message,The content of finding second group of list item is: AC interface comes into force, and the public network LSP of PW does not come into force, and ejecting shouldThe bypass PW label of the internal layer of message, sends message from described AC.
Device described in 13. according to Claim 8 or 12, is characterized in that, described second group of list item dimensionProtect module and be further used for,
When find between this PE and described CE described AC fault time, by the content setting of second group of list itemFor: AC interface does not come into force, and the public network LSP of PW comes into force, and,
Described AC fault forwarding module is further used for, when the bypass PW connecting from this PE receivesWhen MPLS message, eject the outer layer label of this message, find that the content of second group of list item is: AC interfaceDo not come into force, the public network LSP of PW comes into force, and the bypass PW label of the internal layer of this message is exchanged for to thisThe label of the PW that PE connects, the PW that message is connected from this PE sends.
14. devices according to claim 8, is characterized in that, described device further comprises, ACSignalling trouble module, during for described AC fault between this PE and described CE, sends out to far-end PESend AC signalling trouble, to make: far-end PE is switched to flow standby PW from main PW.
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