CN102291316A - Method for realizing zero label popup during MPLS (Multi-Protocol Label Switching) and edge equipment - Google Patents
Method for realizing zero label popup during MPLS (Multi-Protocol Label Switching) and edge equipment Download PDFInfo
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- CN102291316A CN102291316A CN201110270794XA CN201110270794A CN102291316A CN 102291316 A CN102291316 A CN 102291316A CN 201110270794X A CN201110270794X A CN 201110270794XA CN 201110270794 A CN201110270794 A CN 201110270794A CN 102291316 A CN102291316 A CN 102291316A
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Abstract
The invention discloses a method for realizing zero label popup during multi-protocol label switching (MPLS) and edge equipment. The edge equipment comprises a receiving module, a label popup module and a message loopback module. The method comprises the following steps that: the edge equipment receives an MPLS message carrying a multi-layer zero label, pops up an outer layer zero label of the multi-layer zero label and sends and loops the MPLS message from the outlet port of the edge equipment; and the edge equipment repeats the step for popping up the outer layer zero label and looping the message, and terminates a pseudo wire label until only one layer of pseudo wire label is left in the MPLS message. The method and the edge equipment support zero label popup of multi-layer MPLS, so that flow borne on a failed LSP (Label Switching Path) can be smoothly and quickly switched onto a protective link.
Description
Technical field
The present invention relates to electronic communication field, relate in particular to a kind of realization multilayer labels agreement exchange (Multi-Protocol Label Switching is called for short MPLS) zero standard and sign method and the edge device that ejects.
Background technology
The quick heavy-route of multi-label protocol switching traffic engineering tunnel (MPLS Traffic Engineering Fast ReRoute; be called for short MPLS TE FRR) be a technology that realizes MPLS network localised protection; in arrangement in the MPLS network of MPLS TE FRR; when link or node failure appear in the somewhere; the flow that the link that process lost efficacy or the label switched path of node (Label Switching Path is called for short LSP) are gone up carrying will switch on the protection link again apace.
Fig. 1 has provided MPLS TE FRR classical group anastomose composition, and wherein, equipment PE1 and equipment PE2 are the edge devices (Provider Edge is called for short PE) of service provider network, and be directly continuous with user's edge device (Customer Edge is called for short CE).In the MPLS network, all processing of VPN (virtual private network) (Virtual Private Network, be called for short VPN) are all occurred on the PE.Equipment P1, P2 are the backbone equipments (Provider is called for short P) in the service provider network, only need possess basic MPLS transfer capability.
In MPLS, transfer of data occurs on the LSP.The sequence label of the node that LSP is each on the path from the source end to terminal.Among Fig. 1, having provided P1 respectively is PE1 distributing labels (100+payload), P2 is P1 distributing labels (200+payload), PE2 is P2 distributing labels (0+payload), and wherein, 100,200,0 is the occurrence of label, payload is the quiet lotus of message, label forwarding generally takes POP directly to eject mode at the PE node, behind the ejection outer layer label, continues to search vpn label.Promptly transfer equipment after on the P node, generally taking Swap exchange or inferior last ricochet to go out (Penultimate HopPopping is called for short PHP) outer layer label.
The basic principle that the flow that MPLS TE FRR technology is upward carried the LSP that lost efficacy switches on the protection link again apace is to protect one or more LSP with a LSP who sets up in advance.The LSP of Jian Liing is called protection LSP in advance, promptly is equipped with LSP, and protected LSP is called main LSP.Fig. 2 and Fig. 3 have provided two kinds respectively and have set up the mode that is equipped with LSP:
As shown in Figure 2, the node of main LSP (solid line) process is PE1 → P1 → P2 → PE2, and the node that is equipped with LSP (dotted line) process is P1 → P3 → PE2.And as shown in Figure 3, the node of main LSP (solid line) process is PE1 → P1 → P2 → PE2, and the node that is equipped with LSP (dotted line) process also is P1 → P1 → P2 → PE2, but P2 has adopted different port here, also is the mode that a kind of foundation is equipped with LSP.
After having set up LSP fully as shown in Figure 3, when the flow on the main LSP switches to after fully LSP goes up, can receive two-layer MPLS zero standard label (configuration enable explicit MPLS zero standard is signed on node PE2) on the node PE2 according to MPLS TE FRR operation principle, two-layer MPLS zero standard is as shown in Figure 3 signed (0+0+payload).Outer MPLS zero standard is signed to node PE2 is the MPLS label that node P2 master LSP distributes, and internal layer MPLS zero standard is signed the MPLS label that is equipped with the LSP distribution for node PE2 for node P2.But, following problem can appear when PE2 need eject two-layer MPLS label:
Two-layer MPLS zero standard label have been received on the PE2, but, PE2 adopts the ASIC exchange chip at present, can only take the POP pop-up action, label is done the termination action at the bottom of searching stack then, promptly can only eject one deck MPLS zero standard signs, that is to say, because the restriction in the design of ASIC exchange chip, still do not support to eject the operation that multilayer MPLS zero standard is signed (greater than 1 layer), when two MPLS zero standards label occurring, the PE2 node just cannot be handled, do not handle and to abandon, flow on the LSP of winner is switched to fully can't proceed down on the LSP.
Summary of the invention
The technical issues that need to address of the present invention provide a kind of multilayer labels agreement exchange (MPLS) zero standard of realizing and sign method and the edge device that ejects; do not support multilayer MPLS zero standard to sign the problem that ejects to overcome edge device, the flow that makes the LSP that lost efficacy go up carrying can switch on the protection link smoothly apace.
In order to solve the problems of the technologies described above, the invention provides a kind of multilayer labels agreement exchange zero standard of realizing and sign the method that ejects, comprising:
Edge device receives and carries label protocol exchange (MPLS) message that the multilayer zero standard is signed, and the outer zero standard that described multilayer zero standard is signed is signed and ejected, and then described MPLS message sent and loopback is returned from the outbound port of described edge device;
Described edge device repeats that the outer zero standard of above-mentioned ejection is signed and the step of loopback message, behind the only remaining one deck pseudo line tag of described MPLS message, to the action that terminates of described pseudo line tag.
Further, the outer zero standard that described multilayer zero standard is signed is signed to eject and is comprised:
Outer zero standard label to described multilayer zero standard label adopt time last ricochet to go out (PHP) action with the ejection of described outer zero standard label.
Further, described MPLS message is sent and loopback returns to comprise from the outbound port of edge device:
Select an idle port of described edge device, and on this idle port, inloop be set, with described MPLS message from this idle port send and loopback return.
Further, described method also comprises: before first described MPLS message being sent from the outbound port of described edge device and loopback returns, revise the source MAC of described MPLS message.
Further, described edge device adopts ASIC exchange chip or network processing unit.
In addition,, the invention provides a kind of multilayer labels agreement exchange zero standard of realizing and sign the edge device that ejects, comprising in order to solve the problems of the technologies described above:
Receiver module is used to receive label protocol exchange (MPLS) message that carries multilayer zero standard label that other edge devices send, and is sent to the label pop-up module;
The label pop-up module, be used for the outer zero standard that the MPLS message multilayer zero standard of receiver module and the transmission of message loopback module is signed is signed ejection, judge whether only remaining one deck pseudo line tag of described MPLS message, if, to the action that terminates of described pseudo line tag, otherwise, described MPLS message is sent to message loopback module;
Message loopback module is used for the described MPLS message that will receive from the label pop-up module and sends and loopback is returned from the outbound port of edge device, is sent to the label pop-up module.
Further, the outer zero standard that described label pop-up module is signed multilayer zero standard in the MPLS message of receiver module and the transmission of message loopback module is signed and is ejected, and comprising:
The outer zero standard label that described label pop-up module is signed described multilayer zero standard adopt time last ricochet to go out (PHP) action described outer zero standard are signed ejection.
Further, described message loopback module is sent described MPLS message and loopback is returned from the outbound port of edge device, comprising:
Select an idle port of described edge device, and on this idle port, inloop be set, with described MPLS message from this idle port send and loopback return.
Further, described message loopback module also is used for revising the source MAC of described MPLS message before first described MPLS message being sent from the outbound port of described edge device and loopback returns.
Further, described edge device adopts ASIC exchange chip or network processing unit.
Compared with prior art, behind employing the present invention, when edge device has received that multilayer MPLS zero standard is signed, support multilayer MPLS zero standard to sign and eject that the flow that the feasible LSP that lost efficacy goes up carrying can switch on the protection link smoothly apace.
Description of drawings
Fig. 1 is the typical networking schematic diagram of MPLS TE FRR;
Fig. 2 is that mode and the P3 node that a kind of foundation is equipped with LSP in the MPLS TE FRR PE technology received two-layer MPLS label schematic diagram;
Fig. 3 is that a kind of foundation is equipped with the mode of LSP and PE2 node and receives that two-layer MPLS zero standard signs schematic diagram in the MPLS TE FRR PE technology;
Fig. 4 ejects the edge device structure chart that multilayer MPLS zero standard is signed among the embodiment;
Fig. 5 is that edge device ejects the flow chart that multilayer MPLS zero standard is signed among the embodiment;
Fig. 6 is that PE2 ejects the flow chart that two-layer MPLS zero standard is signed in the application example;
Fig. 7 is one and uses the schematic diagram that label ejects in the example.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, hereinafter will be elaborated to embodiments of the invention in conjunction with the accompanying drawings.Need to prove that under the situation of not conflicting, embodiment among the application and the feature among the embodiment be combination in any mutually.
Embodiment:
Below in conjunction with drawings and Examples technical solution of the present invention is described in further detail:
As shown in Figure 4, present embodiment provides a kind of multilayer labels agreement exchange (MPLS) zero standard of realizing to sign the edge device that ejects, described edge device can adopt ASIC exchange chip, network processing unit etc., comprises receiver module, label pop-up module and message loopback module, wherein:
Receiver module is used to receive the MPLS message that carries multilayer zero standard label that other edge devices send, and is sent to the label pop-up module;
The label pop-up module, the outer zero standard that multilayer zero standard in the MPLS message of receiver module and the transmission of message loopback module is signed is signed ejection, judge whether only remaining one deck pseudo line tag of described MPLS message, if, to the action that terminates of described pseudo line tag, otherwise, described MPLS message is sent to message loopback module;
Wherein, the outer zero standard that the multilayer zero standard is signed in the MPLS message that described label pop-up module sends described edge device or the MPLS message of described loopback is signed and is ejected, and comprising:
The outer zero standard label that described label pop-up module is signed described multilayer zero standard adopt time last ricochet to go out (PHP) action described outer zero standard are signed ejection.
Message loopback module is used for the described MPLS message that will receive from the label pop-up module and sends and loopback is returned from the outbound port of edge device, is sent to the label pop-up module.
Wherein, described message loopback module is sent described MPLS message and loopback is returned from the outbound port of edge device, comprising:
Described message loopback module is selected an idle port of described edge device, and on this idle port inloop is set, with described MPLS message from this idle port send and loopback return.Described message loopback module also is used for revising the source MAC of described MPLS message before described MPLS message being sent from the outbound port of edge device and loopback returns.As a kind of optimal way, can before first described MPLS message being sent from the outbound port of described edge device and loopback returns, revise the source MAC of described MPLS message.
Can certainly before described MPLS message being sent from the outbound port of described edge device at every turn and loopback returns, revise the source MAC of described MPLS message.And amended MAC Address is different with source MAC certainly, because if the MAC Address of the MPLS message that loopback is returned is identical with source MAC, promptly the source MAC with equipment is identical, equipment can think that then message makes mistakes this packet loss.In addition, repeatedly amended MAC Address can be revised as identical MAC Address, also can be different MAC Address.
As shown in Figure 5, present embodiment provides a kind of multilayer labels agreement exchange (MPLS) zero standard of realizing to sign the method that ejects, and may further comprise the steps:
S101: edge device is received and is carried the MPLS message that multilayer (greater than 1 layer) zero standard is signed;
Wherein, edge device comprises the ASIC exchange chip, and network processing unit, but be not limited thereto comprises that other can be as the chip or the device of service provider's edge device.
S102: the outer zero standard label to multilayer zero standard label in the described MPLS message adopt time last ricochet to go out the outer zero standard label of (PHP) action ejection;
S103: described MPLS message is sent and loopback is returned from the outbound port of described edge device;
In step S103, select an idle port of described edge device, and on this idle port, inloop be set, with described MPLS message from this idle port send and loopback return.
In addition, before described MPLS message being sent from the outbound port of edge device and loopback returns, need to revise the source MAC of described MPLS message.
S104: if the only remaining one deck pseudo line tag of the MPLS message that loopback is returned, execution in step S105 then, otherwise return step S102;
S105: edge device is to the action that terminates of described pseudo line tag.
Use in the example at one, under Fig. 3 scene of mentioning in the background technology, when node P1 when the link failure of node PE2 or node P2 lost efficacy, flow on the main LSP switches to and is equipped with on the LSP, received on the PE2 that the MPLS message that carries two-layer zero standard label is an example, should adopt the ASIC exchange chip with PE2 in the example, as shown in Figure 6, it is as follows to realize that on the ASIC exchange chip two-layer MPLS zero standard is signed the ejection flow process:
S201:PE2 receives the MPLS message that carries two-layer zero standard label that PE1 sends;
As shown in Figure 7, during the two-layer zero standard that PE2 obtains is signed, DMAC is a target MAC (Media Access Control) address, SMAC1 is a source MAC, it is that node PE2 is the MPLS label that node P2 master LSP distributes that the 1st zero standard signed, it is that node PE2 is equipped with the MPLS label that LSP distributes for node P2 that the 2nd zero standard signed, and PW label is a pseudo line tag, and payload is the quiet lotus of message.
S202:PE2 adopts the PHP action to eject the 1st zero standard and signs, and promptly outer zero standard is signed;
S203: revising the message source MAC Address is a specific MAC Address (MAC Address different with SMAC1 is as 00d0.doff.fffa), then this MPLS message is sent and loopback is returned from the outbound port of described ASIC exchange chip;
S204: judge the only remaining one deck pseudo line tag of MPLS message that loopback is returned;
S205:PE2 ejects the 2nd zero standard and signs the action that terminates of this pseudo line tag.
In above-mentioned steps 202～205, can also when the initialization of ASIC exchange chip, be provided with as follows:
Step 301: select that untapped idle port is provided with inloop as interior central port in the ASIC exchange chip on this port;
Step 302: add the forwarding-table item that a zero standard is signed, the label action is PHP at the bottom of the non-stack of list item;
Step 303: add the forwarding-table item of next jumping, the outbound port of next jumping is set to the loopback port;
Step 304: the source MAC that upgrades outbound port place three layer interface list items is a specific source MAC, this specific MAC Address needs different with source MAC, such as, can be set at 00d0.doff.fffa, can find out by the MPLS label shown in the message of PE2 loopback among Fig. 7, wherein, SMAC1 is revised as SMAC2.
Like this, after node PE2 receives the MPLS message, can carry out the pop-up action that two-layer zero standard is signed automatically, and then carry out the termination action of pseudo line tag, be equipped with the forwarding that LSP finishes the MPLS label thereby can utilize.
From the foregoing description as can be seen; realization multilayer MPLS zero standard provided by the invention is signed the method and the edge device that eject and is signed by adopting the PHP action to eject outer zero standard; and with the message loopback; repeat up to the only remaining one deck pseudo line tag of MPLS message; then to the pseudo line tag action that terminates; finished the ejection that multilayer MPLS zero standard is signed; do not support multilayer MPLS zero standard to sign the problem that ejects thereby overcome edge device, the flow that makes the LSP that lost efficacy go up carrying can switch on the protection link smoothly apace.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to finish by program, described program can be stored in the computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each the module/unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
The above is the preferred embodiments of the present invention only, is not to be used to limit protection scope of the present invention.According to summary of the invention of the present invention; also other various embodiments can be arranged; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making various corresponding changes and distortion according to the present invention; within the spirit and principles in the present invention all; any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. realize that the multilayer labels agreement exchanges zero standard and signs the method that ejects for one kind, it is characterized in that, edge device is received and is carried label protocol exchange (MPLS) message that the multilayer zero standard is signed, the outer zero standard that described multilayer zero standard is signed is signed and is ejected, and then described MPLS message is sent and loopback is returned from the outbound port of described edge device;
Described edge device repeats that the outer zero standard of above-mentioned ejection is signed and the step of loopback message, behind the only remaining one deck pseudo line tag of described MPLS message, to the action that terminates of described pseudo line tag.
2. the method for claim 1 is characterized in that:
The described outer zero standard that described multilayer zero standard is signed is signed to eject and is comprised:
Outer zero standard label to described multilayer zero standard label adopt time last ricochet to go out (PHP) action with the ejection of described outer zero standard label.
3. the method for claim 1 is characterized in that:
Described described MPLS message is sent and loopback returns to comprise from the outbound port of edge device:
Select an idle port of described edge device, and on this idle port, inloop be set, with described MPLS message from this idle port send and loopback return.
4. as claim 1 or 3 described methods, it is characterized in that described method also comprises: before first described MPLS message being sent from the outbound port of described edge device and loopback returns, revise the source MAC of described MPLS message.
5. the method for claim 1 is characterized in that:
Described edge device adopts ASIC exchange chip or network processing unit.
6. realize that the multilayer labels agreement exchanges zero standard and signs the edge device that ejects for one kind, comprising:
Receiver module is used to receive label protocol exchange (MPLS) message that carries multilayer zero standard label that other edge devices send, and is sent to the label pop-up module;
The label pop-up module, be used for the outer zero standard that the MPLS message multilayer zero standard of receiver module and the transmission of message loopback module is signed is signed ejection, judge whether only remaining one deck pseudo line tag of described MPLS message, if, to the action that terminates of described pseudo line tag, otherwise, described MPLS message is sent to message loopback module;
Message loopback module is used for the described MPLS message that will receive from the label pop-up module and sends and loopback is returned from the outbound port of edge device, is sent to the label pop-up module.
7. edge device as claimed in claim 6 is characterized in that:
The outer zero standard that described label pop-up module is signed multilayer zero standard in the MPLS message of receiver module and the transmission of message loopback module is signed and is ejected, and comprising:
The outer zero standard label that described label pop-up module is signed described multilayer zero standard adopt time last ricochet to go out (PHP) action described outer zero standard are signed ejection.
8. edge device as claimed in claim 6 is characterized in that:
Described message loopback module is sent described MPLS message and loopback is returned from the outbound port of edge device, comprising:
Select an idle port of described edge device, and on this idle port, inloop be set, with described MPLS message from this idle port send and loopback return.
9. as claim 6 or 8 described edge devices, it is characterized in that:
Described message loopback module also is used for revising the source MAC of described MPLS message before first described MPLS message being sent from the outbound port of described edge device and loopback returns.
10. edge device as claimed in claim 5 is characterized in that:
Described edge device adopts ASIC exchange chip or network processing unit.
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