CN103269315B - Label distribution method, device, System and Network equipment - Google Patents
Label distribution method, device, System and Network equipment Download PDFInfo
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- CN103269315B CN103269315B CN201310152567.6A CN201310152567A CN103269315B CN 103269315 B CN103269315 B CN 103269315B CN 201310152567 A CN201310152567 A CN 201310152567A CN 103269315 B CN103269315 B CN 103269315B
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Abstract
The invention discloses a kind of label distribution method, device, System and Network equipment, belong to network communication field.Described label distribution method comprises: be the first label switched path that the first forwarding unit is generated to the second forwarding unit, this first label switched path is through the 3rd forwarding unit; Be that the first forwarding unit generates FTN; Be that the 3rd forwarding unit generates ILM; FTN, ILM and the first label switched path is sent to the first forwarding unit and the 3rd forwarding unit.Described label distribution device comprises path-generating module, FTN generation module, ILM generation module and sending module.The present invention distributes identical label to all forwarding units be positioned on same label switched path, in the process that packet forwards, intermediate label switch router no longer carries out the operation of ejecting label/press-in label after receiving packet, but directly packet is forwarded, reach and reduce the label distribution time, improve the effect of forward efficiency.
Description
Technical field
The present invention relates to network communication field, particularly a kind of label distribution method, device, System and Network equipment.
Background technology
MPLS(Multi-ProtocolLabelSwitching, multiprotocol label switching) be forwarding speed in order to improve router and the agreement proposed.Each forwarding unit (such as router or switch) in MPLS network generally includes the controller of control plane and the physics forwarding unit of forwarding plane, the controller of control plane is that each forwarding unit issues the label distributed, the physics forwarding unit of forwarding plane utilizes the label distributed that the packet received is carried out fast-forwarding according to well-determined path, the path formed in the process of label distribution is label switched path (LSP, LabelSwitchPath).
In the method for existing label distribution, each controller being positioned at label switched path downstream is based on forwarding equivalence class (FEC, ForwardingEquivalenceClasses) different labels is distributed for being positioned at the controller of adjacent upstream on label switched path, after controller receives the label of distribution, this label is handed down to the physics forwarding unit corresponding with this controller; Wherein, the packet grouping being sent to same destination address can be defined as a forwarding equivalence class, and forwarding equivalence class can also be divided by source address, destination interface etc.
Concrete, shown in Figure 1, it illustrates the schematic diagram that in prior art, in MPLS network, a strip label switching path label is distributed.This label switched path comprises forwarding unit A, forwarding unit B and forwarding unit C, and wherein C is the address of the FEC of label switched path A->B->C, C is 3.3.3.3.Be that A->B->C label distribution process is as follows based on label switched path: first, controller A asks the label of destination address 3.3.3.3 to controller B, and controller B asks the label of destination address 3.3.3.3 to controller C; Then, the label that controller C is assigned to destination address 3.3.3.3 to controller B is 200, and the label that controller B is assigned to destination address 3.3.3.3 to controller A is 100; Finally, controller A is issued to the label 100 of destination address 3.3.3.3 to forwarding unit A, and controller B is issued to the label 200 of destination address 3.3.3.3 to forwarding unit B.
Label distribution on label switched path well after, as the forwarding unit A of the first node of label forwarding path A->B->C after receiving forwarding data bag, label 100 is pressed in forwarding data bag, and by this label be 100 forwarding data bag send to forwarding unit B; As the forwarding unit B of label forwarding path A->B->C intermediate node after receiving label and being the forwarding data bag of 100, label 100 can be ejected, label 200 is pressed into simultaneously, and according to the interface of distributing labels 200, forwarding data bag is sent to forwarding unit C.
Realizing in process of the present invention, inventor finds that prior art at least exists following problem: first, in the process realizing label distribution, label distribution mode is the downstream forwarding unit be positioned on label switched path is that upstream forwarding unit distributes, when the forwarding unit on label switched path is very many, the time of label distribution can be very long; Second, the label be assigned with due to each forwarding unit on label switched path is all different, is positioned at the forwarding unit of intermediate node on label switched path when forwarding data bag, needs to carry out the operation of ejecting/being pressed into label, namely perform write operation to forwarding data bag, forward efficiency is lower.
Summary of the invention
Oversize in order to solve the label distribution time in label distribution process, the problem that forward efficiency is lower, embodiments provides a kind of label distribution method, device, System and Network equipment.Described technical scheme is as follows:
First aspect, provides a kind of label distribution method, and described method comprises:
The network equipment is the first label switched path that the first forwarding unit is generated to the second forwarding unit, described first label switched path the forwarding unit of process comprise described first forwarding unit, the 3rd forwarding unit and described second forwarding unit, wherein said first forwarding unit is ingress label switch router IngressLSR, described 3rd forwarding unit is intermediate label switch router TransitLSR, and described second forwarding unit is outlet LSR EgressLSR; Described second forwarding unit is the forwarding equivalence class FEC of described first label switched path;
The described network equipment is that described first forwarding unit generates forwarding equivalence class to down hop label forwarding item FTN (FEC-TO-NHLFE), and described FTN comprises the first label, the first label action, the first outgoing interface information and described FEC; Wherein, described first label is the described network equipment is the label that described FEC distributes; The outgoing interface of process needed for described first outgoing interface information is forwarded to described second forwarding unit packet for identifying described first forwarding unit; Described first label action operates for the press-in label Push identifying described first forwarding unit process and carry out to the packets need of described second forwarding unit;
The described network equipment is that the 3rd forwarding unit generates into label mapping ILM (IncomingLabelMap), and described ILM comprises described first label, the second label action and the second outgoing interface information; Wherein, described second outgoing interface information be forwarded to described second forwarding unit for identifying described 3rd forwarding unit packet needed for the outgoing interface of process; Described second label action operates for the forwarding Go identifying described 3rd forwarding unit process and carry out to the packets need of described second forwarding unit;
The described network equipment sends described FTN, described ILM and described first label switched path to described first forwarding unit and described 3rd forwarding unit.
Second aspect, provide a kind of label receiving system, described device, comprising:
Path-generating module, for being generated to the first label switched path of the second forwarding unit for the first forwarding unit, described first label switched path the forwarding unit of process comprise described first forwarding unit, 3rd forwarding unit and described second forwarding unit, wherein said first forwarding unit is ingress label switch router, described 3rd forwarding unit is intermediate label switch router, and described second forwarding unit is outlet LSR; Described second forwarding unit is the FEC of described first label switched path;
FTN generation module, comprises the first label that described path-generating module determines, the first label action, the first outgoing interface information and described FEC for generating FTN, described FTN for described first forwarding unit; Wherein, described first label is the described network equipment is the label that described FEC distributes; The outgoing interface of process needed for described first outgoing interface information is forwarded to described second forwarding unit packet for identifying described first forwarding unit; The Push operation that described first label action is carried out to the packets need of described second forwarding unit for identifying described first forwarding unit process;
ILM generation module, comprises the first label that described path-generating module determines, the second label action and the second outgoing interface information for generating ILM, described ILM for the 3rd forwarding unit; Wherein, described second outgoing interface information be forwarded to described second forwarding unit for identifying described 3rd forwarding unit packet needed for the outgoing interface of process; The Go operation that described second label action is carried out to the packets need of described second forwarding unit for identifying described 3rd forwarding unit process;
Sending module, for sending the first label switched path that described FTN, described ILM and described path-generating module generate to described first forwarding unit and described 3rd forwarding unit.
The third aspect, provides a kind of network equipment, and the described network equipment comprises the label distribution device that second aspect provides.
Fourth aspect, provides a kind of label distribution system, and described system comprises the network equipment and at least two forwarding units that the third aspect provides.
5th aspect, provides a kind of label distribution system, and described system comprises the network equipment, controller and at least two forwarding units that the third aspect provides.
6th aspect, provides a kind of label distribution device, and described device comprises processor and transmitter, and described processor is coupled with described transmitter respectively;
Described processor, for being generated to the first label switched path of the second forwarding unit for the first forwarding unit, described first label switched path the forwarding unit of process comprise described first forwarding unit, 3rd forwarding unit and described second forwarding unit, wherein said first forwarding unit is ingress label switch router, described 3rd forwarding unit is intermediate label switch router, and described second forwarding unit is outlet LSR; Described second forwarding unit is the FEC of described first label switched path;
Described processor, for comprising the first label, the first label action, the first outgoing interface information and described FEC for described first forwarding unit generates FTN, described FTN; Wherein, described first label is the described network equipment is the label that described FEC distributes; The outgoing interface of process needed for described first outgoing interface information is forwarded to described second forwarding unit packet for identifying described first forwarding unit; The Push operation that described first label action is carried out to the packets need of described second forwarding unit for identifying described first forwarding unit process;
Described processor, for comprising described first label, the second label action and the second outgoing interface information for the 3rd forwarding unit generates ILM, described ILM; Wherein, described second outgoing interface information be forwarded to described second forwarding unit for identifying described 3rd forwarding unit packet needed for the outgoing interface of process; The Go operation that described second label action is carried out to the packets need of described second forwarding unit for identifying described 3rd forwarding unit process;
Described processor, for sending described FTN, described ILM and described first label switched path to described first forwarding unit and described 3rd forwarding unit.
7th aspect, provides a kind of network equipment, and the described network equipment comprises the label distribution device that the 6th aspect provides.
Eighth aspect, provides a kind of label distribution system, and described system comprises the network equipment and at least two forwarding units that the 7th aspect provides.
9th aspect, provides a kind of label distribution system, and described system comprises the network equipment, controller and at least two forwarding units that the 7th aspect provides.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
Be the first label switched path that the first forwarding unit is generated to the second forwarding unit according to the network equipment, this first label switched path is through the 3rd forwarding unit, be that the first forwarding unit generates FTN, be that the 3rd forwarding unit generates ILM, and FTN, ILM and the first label switched path are sent to the first forwarding unit and the 3rd forwarding unit, wherein all include the first identical label in FTN and ILM, to solve in prior art the label distribution time in label assigning process oversize, the problem that forward efficiency is lower; Because all forwarding units be positioned on label switched path all receive the first identical label, in the process that packet forwards, intermediate label switch router no longer carries out the operation of ejecting label/press-in label after receiving packet, but directly packet is forwarded, reach and reduce the label distribution time, improve the effect of forward efficiency.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram that in prior art, in MPLS network, a strip label switching path label is distributed;
Fig. 2 is the structural representation of the implementation environment of the present invention's part involved by embodiment;
Fig. 3 is the structural representation of the implementation environment of the present invention's part involved by embodiment;
Fig. 4 is the method flow diagram of the label distribution method that one embodiment of the invention provides;
Fig. 5 is the schematic diagram that in one embodiment of the invention, MPLS network repeating equipment carries out data retransmission by routing table and Label Forwarding Information Base;
Fig. 6 is the structural representation of the label distribution device that one embodiment of the invention provides;
Fig. 7 is the structural representation of the label distribution system that one embodiment of the invention provides.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
For convenience of description, first MPLS network is described, to the description of Fig. 2 and Fig. 3 below specifically please refer to.
Please refer to Fig. 2, it illustrates the structural representation of the implementation environment of the present invention's part involved by embodiment.This implementation environment is a data retransmission network including MPLS network.This data retransmission network comprises: IP network 210, MPLS network 220, IP network 230, IP network 240 and IP network 250.
Forwarding unit in MPLS network 220 can be the network equipment that router, switch etc. have data retransmission function, and the forwarding unit in MPLS network 220 forwards according to the label forwarding path label switched path formed according to mpls protocol.
A large amount of label forwarding paths can be comprised in MPLS network 220, forwarding unit 1 in such as Fig. 2, forwarding unit 2 ..., forwarding unit n forms a strip label forward-path according to data packet transmission direction (i.e. address for the purpose of forwarding unit n), forwarding unit m, forwarding unit 2 ..., forwarding unit s forms another strip label forward-path according to data packet transmission direction (i.e. address for the purpose of forwarding unit s).In MPLS network 220, the forwarding unit (such as forwarding unit 1) be connected with IP network 210 is positioned at the first node location on this forwarding unit place label switched path, and this forwarding unit is called ingress label switch router IngressLSR; And the forwarding unit (such as forwarding unit n) be connected with IP network 230 is positioned at the tail node position on this forwarding unit place label switched path, this forwarding unit is called outlet LSR EgressLSR; Other forwarding unit on label switched path is all positioned at the intermediary locations on this forwarding unit place label switched path, and these forwarding units are called intermediate label switch router TransitLSR.
MPLS network 220 carries out the transmission of packet respectively by wired or wireless mode and IP network 210, IP network 230, IP network 240 and IP network 250.
Please refer to Fig. 3, it illustrates the structural representation of the implementation environment of the present invention's part involved by embodiment.This implementation environment is a data forwarding system supporting label unified distribution, and this data forwarding system can be applied in the MPLS network in Fig. 2.This data forwarding system comprises: the multiple controllers on control plane 320, the network equipment 321, and the multiple physics forwarding units on forwarding plane 340.
General, the controller on control plane 320 is used for physics forwarding unit corresponding to control and management, and a controller and the physics forwarding unit corresponding with this controller form one of them forwarding unit in MPLS network 220.Such as, controller A controls corresponding physics forwarding unit A; Controller B controls corresponding physics forwarding unit B; Controller C and D controls corresponding physics forwarding unit C and D respectively.
Physics forwarding unit in Fig. 3 repeating plane 340 can forward the packet flowed in MPLS network 220, that is, physics forwarding unit can be the network equipment that router, switch etc. have packet forwarding capability, corresponding, controller then can have for virtual router, virtual switch etc. the virtual unit controlling corresponding physics forwarding unit.
Usually, controller and corresponding physics forwarding unit can be two independently equipment, also can be to combine two modules on one device or device.Such as, controller A and physics forwarding unit A can be two modules or the device that are arranged in same equipment, also can be two independent equipment; Same, controller B and physics forwarding unit B can be two modules or the device that are arranged in same equipment, also can be two independent equipment; Controller C and physics forwarding unit C can be two modules or the device that are arranged in same equipment, also can be two independent equipment; Controller D and physics forwarding unit D can be two modules or the device that are arranged in same equipment, also can be two independent equipment.
Certainly, controller A, controller B, controller C and controller D can also be the multiple module or the device that are arranged in same equipment.For example, controller A, controller B, controller C and controller D can be integrated in the network equipment 321.Because each controller all can know the topology information of whole MPLS network, therefore this network equipment 321 also can obtain the topology information of whole MPLS network from these controllers.
It should be noted that in Fig. 3 and only list four controllers and four corresponding physics forwarding units, in other embodiments, the controller of, two, three, more than five or five and the physics forwarding unit of corresponding number can also be included.
Please refer to shown in Fig. 4, it illustrates the method flow diagram of the label distribution method that one embodiment of the invention provides.The network equipment 321 that the present embodiment is mainly applied in implementation environment shown in Fig. 3 with this label distribution method illustrates.This label distribution method can comprise:
401, the network equipment is the first label switched path that the first forwarding unit is generated to the second forwarding unit, first label switched path the forwarding unit of process comprise the first forwarding unit, the 3rd forwarding unit and the second forwarding unit, wherein the first forwarding unit is ingress label switch router, 3rd forwarding unit is intermediate label switch router, and the second forwarding unit is outlet LSR; Second forwarding unit is the FEC of the first label switched path;
Here the said network equipment can for the network equipment 321 in implementation environment shown in Fig. 3, here the first said forwarding unit, the second forwarding unit and the 3rd forwarding unit can for the physics forwarding units be positioned on forwarding plane 340 in implementation environment shown in Fig. 3, and now the network equipment 321 can carry out integrated for the controller in control plane 320; Here the first said forwarding unit, the second forwarding unit and the 3rd forwarding unit can be also the forwarding unit of the controller and forwarding plane 340 physics forwarding unit that comprise control plane 320, and now the network equipment 321 is independently with the controller in control plane 320.
First forwarding unit can be the ingress label switch router in MPLS network, and the 3rd forwarding unit can be now the intermediate label switch router in MPLS network, and the second forwarding unit can be now the outlet LSR in MPLS network.Shown in Figure 2, for the label switched path that forwarding unit 1, forwarding unit 2 and forwarding unit n are formed, the first forwarding unit can be forwarding unit 1, and the 3rd forwarding unit can be forwarding unit 2, and the second forwarding unit can be forwarding unit n.
In actual applications, when controller and the network equipment 321 be two independently equipment time, before step 401, this label distribution method can also comprise: the network equipment receives the first label distribution request that controller sends, and the first label distribution request is for asking to be the label switched path that the first forwarding unit is generated to the second forwarding unit.
When controller is integrated in the network equipment 321, the network equipment 321 can learn the topology information of whole MPLS network according to controller, now, the network equipment 321 can be directly the first label switched path that the first forwarding unit is generated to the second forwarding unit.
It should be noted that, when the network equipment 321 be the first forwarding unit be generated to the first label switched path of the second forwarding unit time, also namely determine the forwarding equivalence class FEC of the first label switched path, namely the second forwarding unit is the FEC of this first label switched path.
402, the network equipment is that the first forwarding unit generation FTN, FTN comprises the first label, the first label action, the first outgoing interface information and FEC; Wherein, the first label is the network equipment is the label that FEC distributes; The outgoing interface of process needed for first outgoing interface information is forwarded to the second forwarding unit packet for identifying the first forwarding unit; The Push operation that first label action is carried out to the packets need of the second forwarding unit for identifying the first forwarding unit process;
Due to when the network equipment 321 be the first forwarding unit be generated to the first label switched path of the second forwarding unit time, determine the forwarding equivalence class FEC of the first label switched path, therefore the network equipment 321 can distribute first label for this FEC.Corresponding, the network equipment 321 can be that the first forwarding unit generates FTN, wherein comprises the first label that promising FEC distributes in FTN.
According to the ingress label switch router that known first forwarding unit of the first label switched path is on this first label switched path, now, the first label action generated for this first forwarding unit may be used for the Push operation that the process of mark first forwarding unit is carried out to the packets need of the second forwarding unit.
Same according to the first label switched path, the down hop of the first forwarding unit to the second forwarding unit is the 3rd forwarding unit, in order to ensure that packet can be forwarded to the 3rd forwarding unit from the first forwarding unit, in the FTN now generated, also need the first outgoing interface information to the 3rd forwarding unit included in the first forwarding unit.That is, packet can be transmitted to the 3rd forwarding unit by the outgoing interface corresponding to this first outgoing interface information by the first forwarding unit.
Because the first forwarding unit in MPLS network may be positioned on multiple label switched path, in order to ensure that the first forwarding unit can determine that when receiving FTN this FTN is which label switched path corresponding, the FTN now generated also needs the information of the FEC including the first label switched path.Like this, when the first forwarding unit revises routing table according to FTN, can FEC be carried out corresponding with the first label.
In actual applications, after the first forwarding unit determines that required data are FTN, the data in FTN can be added in routing table.Such as, the first outgoing interface corresponding to above-mentioned FEC, the first label, the first outgoing interface information and the first label action (Push operation) can be added in routing table as one group of data by the first forwarding unit.
For example, when the first forwarding unit receives packet, if this packet does not comprise label, then according to the object IP allocation index routing table in this packet to find the FEC corresponding with this object IP address, then according to the first label action (i.e. Push operation) in routing table, this first label corresponding with this FEC can be added in this packet.
403, the network equipment is that the 3rd forwarding unit generation ILM, ILM comprises the first label, the second label action and the second outgoing interface information; Wherein, the second outgoing interface information be forwarded to the second forwarding unit for identifying the 3rd forwarding unit packet needed for the outgoing interface of process; The Go operation that second label action is carried out to the packets need of the second forwarding unit for identifying the 3rd forwarding unit process;
Because the network equipment 321 is that the first forwarding unit is generated to the first label switched path of the second forwarding unit through the 3rd forwarding unit, simultaneously, the network equipment 321 further defines the forwarding equivalence class FEC of this first label switched path, and is assigned with first label for this FEC.Corresponding, the network equipment 321 can be that the 3rd forwarding unit generates ILM, wherein comprises the first label that promising FEC distributes in ILM.Because the 3rd forwarding unit here can be arbitrary intermediate label switch router in this first tag path, therefore known, the network equipment 321 is that all forwarding units on the first label switched path are all assigned with the first identical label.
According to the intermediate label switch router that known 3rd forwarding unit of the first label switched path is on this first label switched path, now, the the second label action generated for the 3rd forwarding unit may be used for the Go operation that mark the 3rd forwarding unit process is carried out to the packets need of the second forwarding unit, so that the packet including the first label received directly is sent from the outgoing interface corresponding to the second interface message by Go operation by the 3rd forwarding unit.
Same according to the first label switched path, the down hop of the 3rd forwarding unit to the second forwarding unit is the second forwarding unit, in order to ensure that the packet including the first label can be forwarded to the second forwarding unit from the 3rd forwarding unit, in the ILM now generated, also need to include the second outgoing interface information to the second forwarding unit in the 3rd forwarding unit.That is, the packet including the first label can be transmitted to the second forwarding unit by the outgoing interface corresponding to the second outgoing interface information by the 3rd forwarding unit.
404, the network equipment sends FTN, ILM and the first label switched path to the first forwarding unit and the 3rd forwarding unit.
Concrete, the network equipment 321 can send FTN, ILM and the first label switched path by multicast mode to the first forwarding unit on the first label switched path and the 3rd forwarding unit.
For convenience of description, the packet be made up of FTN, ILM and the first label switched path that the network equipment sends to the first forwarding unit and the 3rd forwarding unit can be called forwarding data bag here.
Obviously, the first label switched path also can be embedded in FTN and ILM.In other words, the network equipment 321 be first forwarding unit generate FTN except can comprising the first label, the first label action, the first outgoing interface information and FEC, the first label switched path can also be comprised; The network equipment be the 3rd forwarding unit generate ILM except can comprising the first label, the second label action and the second outgoing interface information, the first label switched path can also be comprised.
It should be noted that, after the first forwarding unit receives forwarding data bag, can determine that required data are the FTN in this forwarding data bag according to the first label switched path; After the 3rd forwarding unit receives forwarding data bag, can determine that required data are the ILM in this forwarding data bag according to the first label switched path.In actual applications, the network equipment 321, when generating forwarding data bag for forwarding unit, can determine the position of this forwarding data bag of FTN or ILM place corresponding to this forwarding unit according to the position of this forwarding unit place label switched path; Corresponding, forwarding unit is after receiving this forwarding data bag, the position of this forwarding unit on this label switched path can be determined according to the label switched path in this forwarding data bag, and can determine that required data are which data in forwarding data bag according to this position, namely required data are FTN or ILM in forwarding data bag, if ILM, should be which ILM.For example, when label switched path existing multiple forwarding unit, the network equipment 321 is for being positioned at the forwarding unit generation FTN on the first node of label switched path, for being positioned at the different ILM of forwarding unit generating content on the multiple intermediate node of label switched path, the ILM that the forwarding unit be such as followed successively by intermediate node according to the order of label switched path generates is ILM1, ILM2, ILM3, and it is as follows to be arranged in order data according to the order of label switched path: FTN, ILM1, ILM2, ILM3.The 3rd forwarding unit on this label switched path is after receiving this forwarding data, can determine from as the forwarding unit of the 3rd on this label switched path according to label switched path, then finding the 3rd data in forwarding data bag is ILM2, now, the 3rd forwarding unit can determine that ILM2 is required data.
For forwarding unit arbitrary in MPLS network, when this forwarding unit determines that required data are the FTN in forwarding data bag, then revise routing table, be added in routing table by the information in FTN; When forwarding unit determines that required data are the ILM in forwarding data bag, then set up or amendment Label Forwarding Information Base, and the information in ILM is added in Label Forwarding Information Base.Like this, when forwarding unit receives the packet not containing label, can be forwarded by routing table, namely by the routing table in the IP allocation index forwarding unit in this packet, to add label (i.e. Push operation) according to the label action recorded in routing table to this packet; When forwarding unit receives the packet including label, by the Label Forwarding Information Base in this forwarding unit of the tab indexes in this packet, this packet is sent (i.e. Go operation) by corresponding outgoing interface according to outgoing interface information and label action.
In a concrete application scenarios, shown in Figure 5, the MPLS network repeating equipment in one embodiment of the invention that it illustrates carries out the schematic diagram of data retransmission by routing table and Label Forwarding Information Base, wherein MPLS network is connected with IP network 1 and IP network 2.When the first forwarding unit receive the network equipment 321 send include the forwarding data bag of FTN, ILM and the first label switched path time, according to the first label switched path, the first forwarding unit can determine that the first forwarding unit is for entering LSR.The data of the first label now revise the routing table on the first forwarding unit, namely add one group of FEC including the first label switched path in the routing table, distributing for this FEC, the first label action (Push operation) and the first outlet information.Like this, after the first forwarding unit receives packet, index can be carried out to amended routing table according to the IP address in this packet, to find the FEC corresponding with this IP address, and then the first label that this FEC is corresponding and the first label action can be determined, be that the packet received adds this first label according to the first label action Push, then the packet adding the first label forwarded by the outgoing interface corresponding to the first outgoing interface information.
For the 3rd forwarding unit, when the 3rd forwarding unit receive the network equipment 321 send include the forwarding data bag of FTN, ILM and the first label switched path time, according to the first label switched path, 3rd forwarding unit can determine the 3rd forwarding unit is for which intermediate label switch router, and can determine corresponding ILM.Now set up Label Forwarding Information Base and in this Label Forwarding Information Base, add the data of corresponding ILM; Or revise the Label Forwarding Information Base established, in this Label Forwarding Information Base, namely add the data of corresponding ILM.Still shown in Figure 5, that is, in this Label Forwarding Information Base, add the data that a group includes the first label, the second outlet information and the second label action (Go operation).In Figure 5, the second outgoing interface information is here the first outgoing interface, and namely packet can be forwarded to the second forwarding unit by this first outgoing interface by the 3rd forwarding unit.After the 3rd forwarding unit receives packet, if include label in this packet, then can carry out index by the Label Forwarding Information Base of this label to the 3rd forwarding unit.Such as, when the label in packet is the first label, first label identical with the label in this packet is found from this Label Forwarding Information Base, then can obtain this label action corresponding to the first label (i.e. Go operation), the packet that therefore this can be included the first label is directly forwarded by the first outgoing interface in this group.
In actual applications, each forwarding unit may receive multiple forwarding data bags that the network equipment 321 sends, and the content in each forwarding data bag is different.For example, if the network equipment 321 is the first label switched path that the first forwarding unit generates to the second forwarding unit, this second forwarding unit is the FEC of this first label switched path, is designated as FEC1; The network equipment 321 generates the first label for this FEC1.According to above-mentioned steps, content in the FTN that first forwarding unit receives is the first outgoing interface information (the first outgoing interface than in the first forwarding unit as shown in Figure 5), the first action Push and FEC1 in the first label, the first forwarding unit, owing to can determine that according to the first label switched path the first forwarding unit is ingress label switch router, therefore above-mentioned information can be added in routing table.Similar, if the network equipment 321 is the second label switched path that the first forwarding unit generates to the 4th forwarding unit, now the 4th forwarding unit is the FEC of this second label switched path, is designated as FEC2; And generate the second label for this FEC1; According to above-mentioned steps, content in the FTN that first forwarding unit receives is the second label, the second outgoing interface information (arbitrary outgoing interface information of the first outgoing interface information that is different from namely in the first forwarding unit), the first label action Push and FEC2 in the first forwarding unit, owing to can determine that according to the second label switched path the first forwarding unit is ingress label switch router, therefore the second outgoing interface corresponding to FEC2, the second label, the second outgoing interface information and the first label action Push can be added in routing table.
It is noted herein that original content can not empty in the routing table of the first forwarding unit, just on original basis, add new content and enter.And a certain forwarding unit according to the forwarding data bag that the network equipment 321 sends determine need data be FTN time, namely label action be first label action Push operate time, this forwarding unit only can according to above-mentioned method amendment routing table.Obviously, in routing table except the FEC of interpolation, the first label, the first outgoing interface and the first label action, other guide can also be comprised.
In addition, for the 3rd forwarding unit in Fig. 5, the network equipment 321 is except generating except above-mentioned ILM for the 3rd forwarding unit, also can be the label switched path that the 3rd forwarding unit generates to the second forwarding unit, now the second forwarding unit is the FEC of this label switched path, also be FEC1, the label that this FEC1 is corresponding is still the first label.That is, the network equipment 321 is that the 3rd forwarding unit generates FTN, this FTN and comprises the first outgoing interface information in the first label, the 3rd forwarding unit (namely can the 3rd forwarding unit packet is sent to the second forwarding unit from this first outgoing interface information), label action (Push operation) and FEC1.Corresponding, when the 3rd forwarding unit determines the data of this FTN required for oneself, revise the routing table in the 3rd forwarding unit according to FTN, be added in routing table by the content in FTN.Now, not only include amended routing table but also include Label Forwarding Information Base in known 3rd forwarding unit.Only when not including label in the packet that the 3rd forwarding unit receives, just need to add tag operational by routing table to this packet; And when including label in the packet that the 3rd forwarding unit receives, then need directly to forward operation by the label action in Label Forwarding Information Base.
In addition, in preferably embodiment, this network equipment 321 can also be that the second forwarding unit generates an ILM, and described ILM comprises the first label and the 3rd label action; Wherein, the POP operation that the 3rd label action is carried out for the packets need identifying the second forwarding unit process and receive, so that the second forwarding unit removes by POP operation the first label included in the packet of the first label received.
For the ease of distinguishing, be that the ILM that the second forwarding unit generates is called the 2nd ILM below by the network equipment 321.Corresponding, step 404 can change into: the network equipment sends FTN, ILM, the 2nd ILM and the first label switched path to the first forwarding unit, the 3rd forwarding unit and the second forwarding unit.Wherein, first forwarding unit determines the position of the first forwarding unit at the first label switched path according to the first label switched path, according to the first label switched path, 3rd forwarding unit determines that the 3rd forwarding unit is in the position of the first label switched path, the second forwarding unit determines the position of the second forwarding unit at the first label switched path according to the first label switched path.
The network equipment 321 can be that the second forwarding unit generates the 2nd ILM, wherein comprises the first label that promising FEC distributes in the 2nd ILM.
According to the outlet LSR that known second forwarding unit of the first label switched path is on this first label switched path, now, the 3rd label action generated for this second forwarding unit may be used for the POP operation that packets need that the process of mark second forwarding unit receives is carried out, so that the second forwarding unit removes by POP operation the first label included in the packet of the first label received.
When according to forwarding data bag, the second forwarding unit determines that required data are the 2nd ILM, can generate or revise Label Forwarding Information Base, so that the data in the 2nd ILM are added in this Label Forwarding Information Base.That is, the first label and the 3rd label action (POP operation) are added in Label Forwarding Information Base.
Like this, after the second forwarding data receives the packet including the first label, according to this first label, index is carried out to Label Forwarding Information Base, to obtain the 3rd label action corresponding to this first label.Now, remove the first label in this packet according to the 3rd label action, and according to routing table, data retransmission is gone out.
Obviously, here the 2nd ILM also can comprise the 3rd outgoing interface information, so that to remove the first label in packet according to the 3rd label action when the second forwarding unit after, can directly this packet be forwarded according to the 3rd outgoing interface information in Label Forwarding Information Base.
In sum, the label distribution method that the embodiment of the present invention provides, be the first label switched path that the first forwarding unit is generated to the second forwarding unit according to the network equipment, this first label switched path is through the 3rd forwarding unit, be that the first forwarding unit generates FTN, be that the 3rd forwarding unit generates ILM, and by FTN, ILM and the first label switched path send to the first forwarding unit and the 3rd forwarding unit, wherein all include the first identical label in FTN and ILM, to solve in prior art the label distribution time in label assigning process oversize, the problem that forward efficiency is lower, because all forwarding units be positioned on label switched path all receive the first identical label, in the process that packet forwards, intermediate label switch router no longer carries out the operation of ejecting label/press-in label after receiving packet, but directly packet is forwarded, reach and reduce the label distribution time, improve the effect of forward efficiency.
Shown in Figure 6, it illustrates the structural representation of the label distribution device that one embodiment of the invention provides.This label distribution device may be embodied to as the network equipment, also may be embodied to as the part in the network equipment.This label distribution device can include but not limited to: path-generating module 601, FTN generation module 602, ILM generation module 603 and sending module 604.
Path-generating module 601, for being generated to the first label switched path of the second forwarding unit for the first forwarding unit, first label switched path the forwarding unit of process comprise the first forwarding unit, 3rd forwarding unit and the second forwarding unit, wherein the first forwarding unit is ingress label switch router, 3rd forwarding unit is intermediate label switch router, and the second forwarding unit is outlet LSR; Second forwarding unit is the FEC of the first label switched path.
FTN generation module 602, comprises the first label that path-generating module 601 determines, the first label action, the first outgoing interface information and FEC for generating FTN, FTN for the first forwarding unit; Wherein, the first label is the network equipment is the label that FEC distributes; The outgoing interface of process needed for first outgoing interface information is forwarded to the second forwarding unit packet for identifying the first forwarding unit; The Push operation that first label action is carried out to the packets need of the second forwarding unit for identifying the first forwarding unit process.
ILM generation module 603, may be used for being that the 3rd forwarding unit generates ILM, ILM and comprises the first label that path-generating module 601 determines, the second label action and the second outgoing interface information; Wherein, the second outgoing interface information be forwarded to the second forwarding unit for identifying the 3rd forwarding unit packet needed for the outgoing interface of process; The Go operation that second label action is carried out to the packets need of the second forwarding unit for identifying the 3rd forwarding unit process.
Sending module 604, may be used for the first label switched path sending FTN, ILM and path-generating module 601 generation to the first forwarding unit and the 3rd forwarding unit.
Further, this label distribution device can also comprise receiver module 605.
Receiver module 605, may be used for the first label distribution request receiving controller transmission, the first label distribution request is for asking to be the label switched path that the first forwarding unit is generated to the second forwarding unit.
Further, sending module 604 may be used for: the first forwarding unit on the label switched path generated to path-generating module 601 by multicast mode and the 3rd forwarding unit send FTN, ILM and the first label switched path.
In sum, the label distribution device that the embodiment of the present invention provides, be the first label switched path that the first forwarding unit is generated to the second forwarding unit according to the network equipment, this first label switched path is through the 3rd forwarding unit, be that the first forwarding unit generates FTN, be that the 3rd forwarding unit generates ILM, and by FTN, ILM and the first label switched path send to the first forwarding unit and the 3rd forwarding unit, wherein all include the first identical label in FTN and ILM, to solve in prior art the label distribution time in label assigning process oversize, the problem that forward efficiency is lower, because all forwarding units be positioned on label switched path all receive the first identical label, in the process that packet forwards, intermediate label switch router no longer carries out the operation of ejecting label/press-in label after receiving packet, but directly packet is forwarded, reach and reduce the label distribution time, improve the effect of forward efficiency.
It should be noted that: the label distribution device that above-described embodiment provides is when carrying out label distribution, only be illustrated with the division of above-mentioned each functional module, in practical application, can distribute as required and by above-mentioned functions and be completed by different functional modules, internal structure by the network equipment is divided into different functional modules, to complete all or part of function described above.In addition, the label distribution device that above-described embodiment provides and label distribution method embodiment belong to same design, and its specific implementation process refers to embodiment of the method, repeats no more here.
Shown in Figure 7, it illustrates the structural representation of label distribution device in one embodiment of the invention.This label distribution device may be embodied to as the network equipment, also may be embodied to as the part in the network equipment.This label distribution device, can comprise: receiver 701, processor 702, memory 703 and transmitter 704.
Processor 702 is coupled with receiver 701, memory 703 and transmitter 704 respectively.
Memory 703 can comprise computer software, and processor 702 can according to these software performing corresponding operatings.
Processor 702, may be used for is the first label switched path that the first forwarding unit is generated to the second forwarding unit, first label switched path the forwarding unit of process comprise the first forwarding unit, the 3rd forwarding unit and the second forwarding unit, wherein the first forwarding unit is ingress label switch router IngressLSR, 3rd forwarding unit is intermediate label switch router TransitLSR, and the second forwarding unit is outlet LSR EgressLSR; Second forwarding unit is the FEC of the first label switched path.
Processor 702, may be used for being that the first forwarding unit generates FTN (FEC-TO-NHLFE), FTN comprises the first label, the first label action, the first outgoing interface information and FEC; Wherein, the first label is the network equipment is the label that FEC distributes; The outgoing interface of process needed for first outgoing interface information is forwarded to the second forwarding unit packet for identifying the first forwarding unit; The Push operation that first label action is carried out to the packets need of the second forwarding unit for identifying the first forwarding unit process.
Processor 702, may be used for being that the 3rd forwarding unit generates ILM (IncomingLabelMap), ILM comprises the first label, the second label action and the second outgoing interface information; Wherein, the second outgoing interface information be forwarded to the second forwarding unit for identifying the 3rd forwarding unit packet needed for the outgoing interface of process; The Go operation that second label action is carried out to the packets need of the second forwarding unit for identifying the 3rd forwarding unit process.
Transmitter 704, may be used for sending FTN, ILM and the first label switched path to the first forwarding unit and the 3rd forwarding unit.
Further, receiver 701, may be used for the first label distribution request receiving controller transmission, the first label distribution request is for asking to be the label switched path that the first forwarding unit is generated to the second forwarding unit.
Further, transmitter 704, can also for sending FTN, ILM and the first label switched path by multicast mode to the first forwarding unit on label switched path and the 3rd forwarding unit.
In sum, the label distribution device that the embodiment of the present invention provides, be the first label switched path that the first forwarding unit is generated to the second forwarding unit according to the network equipment, this first label switched path is through the 3rd forwarding unit, be that the first forwarding unit generates FTN, be that the 3rd forwarding unit generates ILM, and by FTN, ILM and the first label switched path send to the first forwarding unit and the 3rd forwarding unit, wherein all include the first identical label in FTN and ILM, to solve in prior art the label distribution time in label assigning process oversize, the problem that forward efficiency is lower, because all forwarding units be positioned on label switched path all receive the first identical label, in the process that packet forwards, intermediate label switch router no longer carries out the operation of ejecting label/press-in label after receiving packet, but directly packet is forwarded, reach and reduce the label distribution time, improve the effect of forward efficiency.
In one embodiment, the present invention also provides a kind of label distribution system.This label distribution system can comprise multiple forwarding unit such as the network equipment and the first forwarding unit as described above, the second forwarding unit and the 3rd forwarding unit.In addition, this label distribution system can also comprise the controller sending label distribution request to the network equipment.
Those of ordinary skill in the art can recognize, in conjunction with unit and the algorithm steps of each example of embodiment disclosed herein description, can realize with the combination of electronic hardware or computer software and electronic hardware.These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can use distinct methods to realize described function to each specifically should being used for, but this realization should not thought and exceeds scope of the present invention.
Those skilled in the art can be well understood to, and for convenience and simplicity of description, the specific works process of the system of foregoing description, device and unit, with reference to the corresponding process in preceding method embodiment, can not repeat them here.
In several embodiments that the application provides, should be understood that disclosed system, apparatus and method can realize by another way.Such as, device embodiment described above is only schematic, such as, the division of described unit, can be only a kind of logic function to divide, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of device or unit or communication connection can be electrical, machinery or other form.
The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.
If described function using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computer read/write memory medium.Based on such understanding, the part of the part that technical scheme of the present invention contributes to prior art in essence in other words or this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform all or part of step of method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, portable hard drive, read-only memory (Read-OnlyMemory, ROM), random access memory (RandomAccessMemory, RAM), magnetic disc or CD etc. various can be program code stored medium.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
One of ordinary skill in the art will appreciate that all or part of step realizing above-described embodiment can have been come by hardware, the hardware that also can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a label distribution method, is characterized in that, described method, comprising:
The network equipment is the first label switched path that the first forwarding unit is generated to the second forwarding unit, described first label switched path the forwarding unit of process comprise described first forwarding unit, the 3rd forwarding unit and described second forwarding unit, wherein said first forwarding unit is ingress label switch router IngressLSR, described 3rd forwarding unit is intermediate label switch router TransitLSR, and described second forwarding unit is outlet LSR EgressLSR; Described second forwarding unit is the forwarding equivalence class FEC of described first label switched path;
The described network equipment is that described first forwarding unit generates forwarding equivalence class to down hop label forwarding item FTN (FEC-TO-NHLFE), and described FTN comprises the first label, the first label action, the first outgoing interface information and described FEC; Wherein, described first label is the described network equipment is the label that described FEC distributes; The outgoing interface of process needed for described first outgoing interface information is forwarded to described second forwarding unit packet for identifying described first forwarding unit; Described first label action operates for the press-in label Push identifying described first forwarding unit process and carry out to the packets need of described second forwarding unit;
The described network equipment is that the 3rd forwarding unit generates into label mapping ILM (IncomingLabelMap), and described ILM comprises described first label, the second label action and the second outgoing interface information; Wherein, described second outgoing interface information be forwarded to described second forwarding unit for identifying described 3rd forwarding unit packet needed for the outgoing interface of process; Described second label action operates for the forwarding Go identifying described 3rd forwarding unit process and carry out to the packets need of described second forwarding unit;
The described network equipment sends described FTN, described ILM and described first label switched path to described first forwarding unit and described 3rd forwarding unit.
2. method according to claim 1, is characterized in that, is, before the first forwarding unit is generated to the first label switched path of the second forwarding unit, also comprise at the described network equipment:
The described network equipment receives the first label distribution request that controller sends, and described first label distribution request is for asking to be the label switched path that the first forwarding unit is generated to the second forwarding unit.
3., according to the arbitrary described method of claim 1 or 2, it is characterized in that, the described network equipment sends described FTN, described ILM and described first label switched path to described first forwarding unit and described 3rd forwarding unit, comprising:
The described network equipment sends described FTN and described ILM by multicast mode to described first forwarding unit on described label switched path and described 3rd forwarding unit.
4. a label distribution device, is characterized in that, described device, comprising:
Path-generating module, for being generated to the first label switched path of the second forwarding unit for the first forwarding unit, described first label switched path the forwarding unit of process comprise described first forwarding unit, 3rd forwarding unit and described second forwarding unit, wherein said first forwarding unit is ingress label switch router, described 3rd forwarding unit is intermediate label switch router, and described second forwarding unit is outlet LSR; Described second forwarding unit is the FEC of described first label switched path;
FTN generation module, comprises the first label that described path-generating module determines, the first label action, the first outgoing interface information and described FEC for generating FTN, described FTN for described first forwarding unit; Wherein, described first label is the network equipment is the label that described FEC distributes; The outgoing interface of process needed for described first outgoing interface information is forwarded to described second forwarding unit packet for identifying described first forwarding unit; The Push operation that described first label action is carried out to the packets need of described second forwarding unit for identifying described first forwarding unit process;
ILM generation module, comprises the first label that described path-generating module determines, the second label action and the second outgoing interface information for generating ILM, described ILM for the 3rd forwarding unit; Wherein, described second outgoing interface information be forwarded to described second forwarding unit for identifying described 3rd forwarding unit packet needed for the outgoing interface of process; The Go operation that described second label action is carried out to the packets need of described second forwarding unit for identifying described 3rd forwarding unit process;
Sending module, for sending the first label switched path that described FTN, described ILM and described path-generating module generate to described first forwarding unit and described 3rd forwarding unit.
5. device according to claim 4, is characterized in that, described device, also comprises:
Receiver module, for receiving the first label distribution request that controller sends, described first label distribution request is for asking to be the label switched path that the first forwarding unit is generated to the second forwarding unit.
6., according to the arbitrary described device of claim 4 to 5, it is characterized in that, described sending module, for:
Described first forwarding unit on the label switched path generated to described path-generating module by multicast mode and described 3rd forwarding unit send described FTN, described ILM and described first label switched path.
7. a network equipment, is characterized in that, the described network equipment comprises as the label distribution device as described in arbitrary in claim 4 to 6.
8. a label distribution system, is characterized in that, described system comprises the network equipment as claimed in claim 7 and at least two forwarding units.
9. a label distribution system, is characterized in that, described system comprises the network equipment as claimed in claim 7, controller and at least two forwarding units.
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| CN105763411B (en) * | 2014-12-15 | 2019-12-13 | 华为技术有限公司 | Method and device for establishing multicast tunnel |
| CN112087386B (en) * | 2015-09-22 | 2024-01-02 | 华为技术有限公司 | Message processing method, device and system |
| CN106209559B (en) * | 2016-07-12 | 2019-05-07 | 华为技术有限公司 | A kind of method and apparatus for establishing Multicast Tunnel |
| CN107086960B (en) * | 2017-02-28 | 2020-06-09 | 新华三技术有限公司 | Message transmission method and device |
| CN107888493B (en) * | 2017-11-30 | 2020-04-21 | 迈普通信技术股份有限公司 | Method and device for establishing label switching path |
| CN110290068B (en) * | 2018-03-19 | 2021-09-14 | 华为技术有限公司 | Sending method, receiving method and equipment for adhesion label |
| CN110086718A (en) * | 2019-05-13 | 2019-08-02 | 和记奥普泰通信技术有限公司 | A kind of VLL Fast implementation based on packetizing MPLS |
| CN111371686B (en) * | 2020-03-19 | 2023-01-24 | 刘奇峰 | Message forwarding method and device |
| CN113556795B (en) * | 2021-07-20 | 2023-03-24 | 哈尔滨海能达科技有限公司 | Method for determining first-time forwarding equipment, related device and computer storage medium |
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