CN1929479A - Method and system for protecting label exchanging path - Google Patents
Method and system for protecting label exchanging path Download PDFInfo
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- CN1929479A CN1929479A CNA2005100987508A CN200510098750A CN1929479A CN 1929479 A CN1929479 A CN 1929479A CN A2005100987508 A CNA2005100987508 A CN A2005100987508A CN 200510098750 A CN200510098750 A CN 200510098750A CN 1929479 A CN1929479 A CN 1929479A
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Abstract
This invention relates to one method and system to protect label exchange, which comprises the following steps: when there is circuit generation signal affair, inverse station multiple agreement process units inform its fault into other section point and informing station data to list process unit; data transfer list process unit informs needed label process module to fulfill inverse; when multiple agreement is on other station point to inform the data conversion process unit; the said data transfer list unit informs the label module process module.
Description
Technical field
The present invention relates to technical field of data transmission, relate in particular to a kind of method and system of protecting label switched path.
Background technology
G.841, during advising, stipulated ITU-T SDH (Synchronous Digital Hierarchy) (Synchronous digital hierarchy; SDH) type of network protection and characteristics; the type and the multiplex section protection protocol of regulation SDH network protection in the suggestion; the multiplex section protection protocol has utilized K byte in the SDH section overhead; the SDH protect networks of finishing, concrete Details Of Agreement can be with reference to ITU-T G.841.
As shown in Figure 1, be defined in during G.841 ITU-T advises in the SDH network multiplex section protective ring, to the D point, the operating path of walking the multiplex section ring is A point-B point-C point-D point to next bar customer service circuit of normal condition by the A point.But as shown in Figure 2; when the fiber break between B point and the C point; B point and C point detect link failure; utilize the K byte in the expense then; another path (can be described as B point-A point-F point-E point-D point-C point) by the multiplex section ring is gone up all websites with fault message announcement ring; the B business of naming a person for a particular job switches to the protection path from operating path then; send business to the A point by the protection path; the A point; the F point; E point and D point correspondingly will protect the business in path to do punch-through process; last C names a person for a particular job and protects the business in path to switch back operating path; send business to the D point, just finished whole switching.
But this multiplex section protection method is utilized and can only be utilized time slot to intersect and realize; can only be supported in the protection of time division multiplexing exchange plane; can't (Multiprotocol LabelSwitch MPLS) utilizes the packet exchange plane to realize multiplex section protection in the network in multiprotocol label switching.
Summary of the invention
The objective of the invention is to propose a kind of method and system of protecting label switched path, can in multi-protocol label switching network, utilize the multiplex section agreement to realize the protection of label switched path.
For this reason, the present invention is by the following technical solutions:
A kind of method of protecting label switched path is applicable in the multi-protocol label switching network, it is characterized in that may further comprise the steps:
A, when circuit mouth generation dropout or LOF incident, the multiplex section protocol processing unit of the website that need switch is notified other websites on the multiplex section ring with fault message, notifies the data forwarding list processing unit of this website simultaneously;
The label processing module of the website that B, described data forwarding list processing unit notice need be switched is switched to the data packet traffic on the work at present path on the protection path;
C, when other websites to the multiplex section ring of multiplex section protocol processes, the multiplex section protocol processing unit of this website is notified the data forwarding list processing unit of this website, the label processing module of this website is notified in described data forwarding list processing unit, to protect the path to convert operating path to, packet change sends on the operating path after the conversion, finishes punch-through process;
D, when multiplex section protocol processes during to another website that need switch; the multiplex section protocol processing unit of this website is notified the data forwarding list processing unit of this website; the label processing module of this website is notified in described data forwarding list processing unit, and the data packet traffic on the work at present path is switched on the protection path.
The multiplex section protocol processing unit of the website that the needs described in the described steps A are switched utilizes the K byte to notify other websites on the multiplex section ring with fault message.
For every kind of service aisle label 2 paths are arranged in the data forwarding list processing unit described in the described steps A, one is operating path, and one is the protection path, gives different weighted values with the protection path for operating path.
The data packet traffic with on the work at present path described in described step B or the step D is switched on the protection path and further may further comprise the steps:
The weighted value in operating path and protection path is changed, finished the transposing between current operating path and the protection path.
To protect the path to convert operating path to further to may further comprise the steps described in the described step C:
The weighted value in protection path is changed into the weighted value of operating path.
The weighted value of described operating path can be 1, and the weighted value in described protection path can be 0.
For every kind of service aisle label 2 paths are arranged in the data forwarding list processing unit described in the described steps A, one is operating path, and one is the protection path, and for these two paths are provided with switch, operating path is a connected state, and the protection path is an off-state.
The data packet traffic with on the work at present path described in described step B or the step D is switched on the protection path and further may further comprise the steps:
Switch transition, operating path transfers off-state to, and the protection path transfers connected state to.
Described data forwarding table can manual configuration, also can dispose automatically according to tag distribution protocol.
A kind of system that protects the tag changeable path routing method; comprise data forwarding list processing unit, multiplex section protocol processing unit, data cross unit, data circuit processing unit; described data circuit processing unit comprises SDH (Synchronous Digital Hierarchy) layer processing module and virtual container encapsulation and label processing module, it is characterized in that:
Comprise operating path and protection path between the described data circuit processing unit; described multiplex section protocol processing unit notification data is transmitted processing unit; described data forwarding list processing unit notified tag processing module is with the protection of finishing the work between path and the protection path.
Described data forwarding list processing unit is provided with path setting element, is used to be provided with the access path between the data circuit processing unit.
Described path processing unit for weighted value is provided with the unit, is used to be provided with the weighted value in operating path and protection path, to identify the path of current connection.
Described path processing unit for switch is provided with the unit, is used to be provided with the on off state in operating path and protection path.
Adopted technical scheme of the present invention; can in multi-protocol label switching network, utilize the multiplex section agreement to realize the protection of label switched path, realize that protection switch time is within 50 milliseconds; and change slightly at original SDH product multiplex section protocol module, just can realize this function.
Description of drawings
Fig. 1 is a customer service circuit schematic diagram under the normal condition in the SDH network;
Fig. 2 is a customer service circuit schematic diagram under the malfunction in the SDH network;
Fig. 3 is a network transfer equipment structural representation in the MPLS network;
Fig. 4 is a label switched path protection flow chart of the present invention;
Fig. 5 is a structural representation of switching the path of switching website among the present invention;
Fig. 6 is the structural representation of the punch-through process of break-through website among the present invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described.
As shown in Figure 3, in the network transfer equipment of data, the light mouth that links to each other between the transfer equipment is called the circuit mouth, and the interface that transfer equipment links to each other with client device is called a crossing.
Transfer equipment comprises following unit: data cross unit, data circuit processing unit, data branch road processing unit, multiplex section protocol processing unit, data forwarding list processing unit, wherein the data circuit processing unit is divided into SDH layer processing module and virtual container (virtual container again, VC) encapsulation and label processing module, data branch road processing unit is divided into interface processing module and label processing module.
The major function of data circuit processing unit is the business of process circuit mouth, in VC, separate and map out packet, according to the MPLS label in the packet, contrasting data is transmitted, find destination slogan and purpose plate position, then destination slogan and purpose plate position information are added in the packet, are sent to the data cross unit.
Data branch road processing unit major function is to handle the business of client, according to the MPLS label in the client data bag, contrasting data is transmitted, and finds destination slogan and purpose plate position, then destination slogan and purpose plate position information are added in the packet, are sent to the data cross unit.
Data forwarding list processing unit major function is the forwarding information of every veneer in the storage system, and the inside comprises the treatment measures for every kind of MPLS label, and treatment measures comprise the label of purpose plate position, destination interface, purpose passage, next jumping etc.; This data forwarding table can manual configuration, also can generate automatically according to the LDP agreement.
This programme is provided with path setting element in data forwarding list processing unit, is used to be provided with the access path between the data circuit processing unit.
There are two paths to walk for every kind of service aisle label in the designing requirement data forwarding table of the present invention; one is operating path; one is the protection path; the data forwarding table is changed the path of label by the weight of changing two paths; the operating path weight for example can be set be " 1 "; the protection path weight value is " 0 "; at this moment can add operating path purpose plate position for every kind of label; destination interface; the purpose passage; when the operating path weight changes to " 0 "; when the protection path weight value changes to " 1 "; current operating path just becomes the protection path, and current protection path has just become operating path.Can add purpose plate position, destination interface, the purpose passage of the operating path after the transposing for every kind of label.Scheme is corresponding therewith, and this path setting element can be designed as weighted value the unit is set, and is used to be provided with the weighted value in operating path and protection path, to identify the path of current connection.
For the packet of each protection passage, have only the path of a break-through, when this path weight value is " 0 ", represent not break-through, when this path weight value is " 1 ", the expression break-through.
Also have a kind of differentiation operating path and protection route method, promptly on operating path and protection path switch is set respectively, operating path is a connected state, and the protection path is an off-state.It is 1 that connected state is equivalent to weight, and it is 0 that off-state is equivalent to weight.If switch and break-through, the switch of current operating path just transfers off-state to, and the switch in current protection path just transfers connected state to.Corresponding therewith, this path setting element can be designed as switch the unit is set, and is used to be provided with the on off state in operating path and protection path.
Data cross unit major function is purpose plate position and the destination interface information in the packet of sending here according to each business board, is forwarded to corresponding plate position and port.
The major function of multiplex section protocol processing unit is handled the multiplex section agreement, according to each wiring board report with the multiplex section relevant information, handle the multiplex section agreement, issue and switch configuration accordingly, the multiplex section agreement meets G.841 suggestion.
Technical scheme of the present invention as shown in Figure 4, as seen from the figure, it mainly may further comprise the steps:
S1, circuit mouth break down.
When judging that the circuit mouth breaks down, carry out follow-up step.
S2, the multiplex section protocol processing unit of switching website utilize the K byte to notify other websites with fault message.
When the fault of circuit mouth generation dropout or LOF, the multiplex section protocol processing unit of the website that need switch utilizes the K byte that fault message is announced other websites on the multiplex section ring.
The weighted value in S3, each website multiplex section protocol processing unit notified tag processing module change operating path and protection path.
The multiplex section protocol processing unit of each website is notified the label processing module of this website, and the weighted value in current operating path that has set and protection path is made amendment.
S4, the packet change of switching website send on the protection path; The break-through website will protect the packet in path to make punch-through process.
Wherein for switching website; be that the weighted value of operating path and the weighted value in protection path are changed; operating path and protection path are just changed like this, and the packet change of switching website has sent on the operating path after original protection path, the transposing.For the break-through website, be the weighted value that the weighted value in protection path is changed to operating path, protect path change to become operating path like this, realize punch-through process.
Just switch website respectively below and the break-through website describes.
As shown in Figure 5; when the fault of circuit mouth generation dropout or LOF; our station need be done and switch website; the multiplex section protocol processing unit can be transmitted processing unit by notification data; data forwarding list processing unit notified tag processing module; change the weighted value in operating path and protection path; change the weighted value of operating path into 0 by 1; and will protect the weighted value in path to change 1 into by 0; transposing has taken place in protection path and operating path like this; just become the operating path after the transposing; data interface board will be the purpose plate position of the operating path after the transposing to the tag processes of every kind of MPLS; destination interface and purpose passage are added up; this moment, packet can be according to purpose plate position; destination interface and purpose passage are forwarded to the operating path after the transposing, realize switching.
As shown in Figure 6; when the multiplex section protocol processes need be done break-through when action to our station; our station just becomes the break-through website; the multiplex section protocol processing unit can be transmitted processing unit by notification data; data forwarding list processing unit notified tag processing module; change the weighted value in protection path into 1 by 0, packet just transmits, thereby has realized the break-through action by the protection path of revising weighted value, i.e. operating path after the conversion.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (13)
1, a kind of method of protecting label switched path is applicable to it is characterized in that in the multi-protocol label switching network, may further comprise the steps:
A, when circuit mouth generation dropout or LOF incident, the multiplex section protocol processing unit of the website that need switch is notified other websites on the multiplex section ring with fault message, notifies the data forwarding list processing unit of this website simultaneously;
The label processing module of the website that B, described data forwarding list processing unit notice need be switched is switched to the data packet traffic on the work at present path on the protection path;
C, when other websites to the multiplex section ring of multiplex section protocol processes, the multiplex section protocol processing unit of this website is notified the data forwarding list processing unit of this website, the label processing module of this website is notified in described data forwarding list processing unit, to protect the path to convert operating path to, packet change sends on the operating path after the conversion, finishes punch-through process;
D, when multiplex section protocol processes during to another website that need switch; the multiplex section protocol processing unit of this website is notified the data forwarding list processing unit of this website; the label processing module of this website is notified in described data forwarding list processing unit, and the data packet traffic on the work at present path is switched on the protection path.
2, the method for protection label switched path as claimed in claim 1 is characterized in that, the multiplex section protocol processing unit of the website that the needs described in the described steps A are switched utilizes the K byte to notify other websites on the multiplex section ring with fault message.
3, the method for protection label switched path as claimed in claim 1; it is characterized in that; for every kind of service aisle label 2 paths are arranged in the data forwarding list processing unit described in the described steps A; one is operating path; one is the protection path, gives different weighted values with the protection path for operating path.
4, the method for protection label switched path as claimed in claim 3 is characterized in that, the data packet traffic with on the work at present path described in described step B or the step D is switched on the protection path and further may further comprise the steps:
The weighted value in operating path and protection path is changed, finished the transposing between current operating path and the protection path.
5, the method for protection label switched path as claimed in claim 3 is characterized in that, will protect the path to convert operating path to further to may further comprise the steps described in the described step C:
The weighted value in protection path is changed into the weighted value of operating path.
6, the method for protection label switched path as claimed in claim 3 is characterized in that, the weighted value of described operating path can be 1, and the weighted value in described protection path can be 0.
7, the method for protection label switched path as claimed in claim 1; it is characterized in that; for every kind of service aisle label 2 paths are arranged in the data forwarding list processing unit described in the described steps A; one is operating path; one is the protection path; for these two paths are provided with switch, operating path is a connected state, and the protection path is an off-state.
8, the method for protection label switched path as claimed in claim 7 is characterized in that, the data packet traffic with on the work at present path described in described step B or the step D is switched on the protection path and further may further comprise the steps:
Switch transition, operating path transfers off-state to, and the protection path transfers connected state to.
9, the method for protection label switched path as claimed in claim 1 is characterized in that, described data forwarding table can manual configuration, also can dispose automatically according to tag distribution protocol.
10, a kind of system that realizes the described protection tag changeable path of claim 1 routing method; comprise data forwarding list processing unit, multiplex section protocol processing unit, data cross unit, data circuit processing unit; described data circuit processing unit comprises SDH (Synchronous Digital Hierarchy) layer processing module and virtual container encapsulation and label processing module, it is characterized in that:
Comprise operating path and protection path between the described data circuit processing unit; described multiplex section protocol processing unit notification data is transmitted processing unit; described data forwarding list processing unit notified tag processing module is with the protection of finishing the work between path and the protection path.
11, system as claimed in claim 10 is characterized in that, described data forwarding list processing unit is provided with path setting element, is used to be provided with the access path between the data circuit processing unit.
12, system as claimed in claim 11 is characterized in that, described path processing unit for weighted value is provided with the unit, is used to be provided with the weighted value in operating path and protection path, to identify the path of current connection.
13, system as claimed in claim 11 is characterized in that, described path processing unit for switch is provided with the unit, is used to be provided with the on off state in operating path and protection path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100987508A CN100558104C (en) | 2005-09-05 | 2005-09-05 | A kind of method and system of protecting label switched path |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100987508A CN100558104C (en) | 2005-09-05 | 2005-09-05 | A kind of method and system of protecting label switched path |
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| CN1929479A true CN1929479A (en) | 2007-03-14 |
| CN100558104C CN100558104C (en) | 2009-11-04 |
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| CNB2005100987508A Active CN100558104C (en) | 2005-09-05 | 2005-09-05 | A kind of method and system of protecting label switched path |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009056053A1 (en) * | 2007-10-24 | 2009-05-07 | Huawei Technologies Co, .Ltd. | A method, device and system of multi-protocol label exchange traffic engineering flow capacity switch |
| CN110838978A (en) * | 2018-08-15 | 2020-02-25 | 迈普通信技术股份有限公司 | Message forwarding method and device |
-
2005
- 2005-09-05 CN CNB2005100987508A patent/CN100558104C/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009056053A1 (en) * | 2007-10-24 | 2009-05-07 | Huawei Technologies Co, .Ltd. | A method, device and system of multi-protocol label exchange traffic engineering flow capacity switch |
| US8565098B2 (en) | 2007-10-24 | 2013-10-22 | Huawei Technologies Co., Ltd. | Method, device, and system for traffic switching in multi-protocol label switching traffic engineering |
| CN110838978A (en) * | 2018-08-15 | 2020-02-25 | 迈普通信技术股份有限公司 | Message forwarding method and device |
| CN110838978B (en) * | 2018-08-15 | 2022-05-24 | 迈普通信技术股份有限公司 | Message forwarding method and device |
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| Publication number | Publication date |
|---|---|
| CN100558104C (en) | 2009-11-04 |
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