CN101610205B - Method for obtaining path, transmitting equipment, receiving equipment and network system - Google Patents
Method for obtaining path, transmitting equipment, receiving equipment and network system Download PDFInfo
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- CN101610205B CN101610205B CN200810126969.8A CN200810126969A CN101610205B CN 101610205 B CN101610205 B CN 101610205B CN 200810126969 A CN200810126969 A CN 200810126969A CN 101610205 B CN101610205 B CN 101610205B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
- H04L45/03—Topology update or discovery by updating link state protocols
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Abstract
The invention discloses a method for obtaining a path, transmitting equipment, receiving equipment and a network system. The method for obtaining a path comprises the following steps: the relevant information for mapping a traffic flow class (TE-Class) is received, and the relevant information for mapping the TE-Class comprises a class type (CT) and a priority class; and when the local TE-Class mapped by the CT and the priority class occurs, a label switch path (LSP) is obtained according to the local TE-Class. The technical scheme of the invention can ensure that the correct label switch path is obtained.
Description
Technical field
The present invention relates to communication technical field, particularly method for obtaining path, transmitting apparatus, receiving equipment and network system.
Background technology
Differentiated services (Diffserv) realizes extendible network design by multiple-stage and split, MPLS (Multiprotocol Label Switch, multiprotocol label switching) traffic engineering (Traffic Engineering, TE) can realize resource reservation, fault-tolerant and optimizing transmission resource.At existing DS-TE (Diffserv-awareTraffic Engineering, differential service flux engineering) in, maximum support 8 CT (Class-Type, Class Type), the combinatorial mapping of each CT and priority is to a TE-Class, and in DS-TE, support at most 8 TE-Class, namely select from 64 possible CT and priority combination.
IGP carries the available bandwidth of TE-Class by non-bandwidth reserved sub TLV (Unreserved Bandwidth sub TLV), carry at most 8 TE-Class available bandwidth (TE-Class [0], TE-Class [1], TE-Class [2] ... ... .TE-Class [7]), these 8 TE-Class are all corresponding with corresponding CT and priority according to configuration, but do not represent each TE-Class which CT corresponding and priority.Other LSR (Label Switch Router, LSR) receive this IGP after, to each TE-Class [i] received (0 <=i <=7), all corresponding with the TE-Class that this locality configures [i], and calculate accordingly.
In available bandwidth information due to 8 TE-Class entrained in the non-bandwidth reserved sub TLV of IGP, do not show each TE-Class which CT corresponding and priority, specify in whole DS-TE territory, all LSR must configure identical TE-Class mapping relations (i.e. the mapping relations of TE-Class and CT and priority) by network manager.
To in the research and practice process of prior art, inventor finds that prior art exists following problem:
Due to needs human configuration TE-Class mapping relations, be difficult to not occur mistake when ensureing configuration, if the mapping relations of the upper each Joint Enterprise of LSP are different, then cause CSPF (Constraint-based ShortestPath First, Constraint Shortest Path First algorithm) path of the path that calculates and expection is not inconsistent, such as on LSR1, be configured with mapping relations: TE-Class [0] <-->{CT1, priority p1}, TE-Class [1] <-->{CT2, priority p2}, LSR2 is configured with mapping relations: TE-Class [0] <-->{CT2, priority p2}, TE-Class [1] <-->{CT0, priority p0}, now, assuming that time LSR1 receives the TE-Class information of LSR2, obtain the information of TE-Class in IGP in order, the TE-Class of corresponding acquisition this locality, concrete, if obtain TE-Class [0] from IGP, corresponding just obtains local TE-Class [0], and that TE-Class [0] correspondence is CT1, priority p1, the bandwidth then designed according to TE-Class [0] is different from expectation, therefore the path selected is not inconsistent with the path of expection yet.
Summary of the invention
The embodiment of the present invention provides a kind of method for obtaining path, transmitting apparatus, receiving equipment and network system, can ensure to obtain correct label forwarding path.
The embodiment of the present invention provides:
A kind of method for obtaining path, the method comprises:
Receive the related information for mapping service traffics classification TE-Class, the described related information for mapping TE-Class comprises Class Type CT and priority;
When there is the local TE-Class that described CT and priority map, according to described local TE-Class, obtain label forwarding path LSP.
A kind of receiving equipment, comprising:
Message reception units, for receiving the related information for mapping TE-Class; The described related information for mapping TE-Class comprises CT and priority;
First judging unit, for judging whether described receiving equipment exists the local TE-Class that described CT and priority map;
Path acquiring unit, for when the judged result of the first judging unit is for being, according to the local TE-Class that described CT and priority map, obtains label forwarding path.
A kind of transmitting apparatus, comprising:
Acquiring unit, for obtaining the related information for mapping TE-Class, the described related information for mapping TE-Class comprises: the CT corresponding to the TE-Class issued with described transmitting apparatus and priority;
Transmitting element, for sending the related information for mapping TE-Class that described acquiring unit obtains.
A kind of network system, comprising: the first label switching router LSR1 and the second label switching router LSR2, wherein,
Described LSR1, the CT corresponding for the TE-Class sent with self issues and priority;
Described LSR2, for receiving the CT and priority that described LSR1 sends, judge whether described LSR2 exists the local TE-Class that described CT and priority map, if, according to the local TE-Class that described CT and priority map, obtain label forwarding path.
The embodiment of the present invention is by obtaining CT and the priority for mapping TE-Class, and utilize described CT and priority, mapping obtains local TE-Class, according to obtained local TE-Class, calculate label forwarding path, to ensure the local bandwidth of TE-Class design that basis is mapped to and the identical of expectation, the path therefore selected also conforms to the path of expection.
Accompanying drawing explanation
The method for obtaining path flow chart that Fig. 1 provides for the embodiment of the present invention one;
The transmitting apparatus structure chart that Fig. 2 provides for the embodiment of the present invention two;
The receiving equipment structure chart that Fig. 3 provides for the embodiment of the present invention three.
Embodiment
The embodiment of the present invention provides a kind of method for obtaining path, and the method comprises: receive the related information for mapping service traffics classification TE-Class; The described related information for mapping TE-Class comprises Class Type CT and priority; When there is the local TE-Class that described CT and priority map, according to described local TE-Class, obtain label forwarding path LSP.The technical side's scheme using the embodiment of the present invention to provide, can ensure to obtain correct label forwarding path.
Consult Fig. 1, the embodiment of the present invention one provides a kind of method for obtaining path, and the method specifically comprises:
Step 101, the first label switching router LSR1 construct IGP message, this IGP message comprises: the sub-TLV (i.e. Class Type and Priority), the 2nd sub-TLV (UnreservedBandwidth) that newly increase, wherein, a sub-TLV comprises the type indication information of the type Type of instruction the one sub-TLV.
The information of the TE-Class that LSR1 configures according to self, fills in the TE-Class [i] in Unreserved Bandwidth.Concrete, for the TE-Class [i] that LSR1 does not configure, to the position of TE-Class [i] 0 should be extended this as in UnreservedBandwidth, represent that this TE-Class [i] is unavailable; For the TE-Class [i] of LSR1 configuration, to the position of TE-Class [i] concrete bandwidth numerical value being filled in Unreserved Bandwidth, namely the non-bandwidth reserved numerical value that LSP corresponding to TE-Class [i] provides is extended this as, represent that this TE-Class [i] is available simultaneously, again Unreserved Bandwidth is sent and namely represent that LSR1 issues the TE-Class of oneself, wherein, the TE-Class that LSR1 issues is available TE-Class [i].
The numerical part that LSR1 has increased " Class Type and Priority " this sub-TLV, this sub-TLV newly in IGP is as shown in table 1:
Wherein, this sub-TLV length is 8 bytes, the corresponding TE-Class of each byte, CT [i] and P [i] is the CT that maps of TE-Class [i] and priority respectively, wherein, CT [i] and P [i] respectively accounts for 4 bits respectively, and span is 0-7.Assuming that mapping relations LSR1 configuring TE-Class and CT and priority are:
TE-Class [0] <-->{CT1, priority P reemption 0}
TE-Class[1]<-->{CT1，Preemption 1}
TE-Class[2]<-->{CT0，Preemption 1}
TE-Class [i] (3 <=i <=7) unused (use)
LSR1, according to the mapping relations of TE-Class and the CT self configured and priority, fills in ClassType and Priority " this sub-TLV, the numerical part of the sub-TLV after filling in is as shown in table 2:
LSR1 constructs IGP message, and this IGP message comprises: this sub-TLV of Class Type and Priority, and, this sub-TLV of Unreserved Bandwidth.
At OSPF (Open Shortest Path First, ospf) in agreement, this sub-TLV of ClassType and Priority belongs to Link TLV, and its type Type is 0x8003, and namely type indication information is expressed as 0x8003; At ISIS (Intermediate System-Intermediate System, intermediate system-intermediate system), this sub-TLV of Class Type and Priority belongs to Extended TLV, and its type Type is 253, and namely type indication information is expressed as 253.
Step 102, LSR1 send IGP message to LSR2.
Step 103, LSR2 resolve the 2nd sub-TLV (i.e. Unreserved Bandwidth), confirm available TE-Class [i].
The specific implementation of this step is: whether the position judging corresponding TE-Class [i] in Unreserved Bandwidth is 0, if be 0, then this TE-Class [i] is unavailable, otherwise TE-Class [i] is available.
Step 104, LSR2 are according to the type indication information indicating the type Type in a sub-TLV (i.e. Class Type andPriority) in IGP message, judge whether the type that can identify a sub-TLV, if can identify, then continue to perform step 105; Otherwise, process ends.
Step 105, LSR2 resolve this sub-TLV of Class Type and Priority, obtain { the CTj that available TE-Class [i] maps, Preemption k}, wherein, 0 <=i, j, k <=7, judge CTj, and whether Preemption k can be mapped to local TE-Class, if so, step 106 is performed; If have an available TE-Class [i] to map { CTj, Preemption k} can not be mapped to local TE-Class, then represent that corresponding LSP path does not exist, perform step 107.
Before this step, the mapping relations of upper preset local TE-Class and the CT of LSR2 and priority.
Step 106, LSR2 confirms CTj, Preemption k can be mapped to local TE-Class, assuming that be mapped to local TE-Class [h], wherein, 0 <=h <=7, h can equal i, also i can be not equal to, then according to being mapped to local TE-Class [h], obtain CTj again, bandwidth numerical value in Unreserved Bandwidth corresponding to Preemption k, then, according to the TE-Class [h] of this locality be mapped to and the bandwidth numerical value that obtains, determine LSP (Label Switched Path, label forwarding path), CTj in Class Type and Priority, after Preemption k handles accordingly, process ends.
Step 107, LSR2 outputting alarm message, namely can send alarm information or direct display alarm message on interface to the keeper of this locality, this alarm information comprises: instruction CTj, Preemption k can not be mapped to the information of local TE-Class.
For making the embodiment of the present invention clearly understand, now give an actual example to the detailed description of the invention, assuming that the mapping relations of TE-Class and CT and priority are as follows on LSR2:
TE-Class[0]<-->{CT1，Preemption 1}
TE-Class[1]<-->{CT0，Preemption 1}
TE-Class [i] (2 <=i <=7) unused (use)
After LSR2 receives the IGP message from LSR1, whether the position first judging corresponding TE-Class [i] in Unreserved Bandwidth is 0, if be not 0, then represent that this TE-Class [i] is available, assuming that LSR1 has issued TE-Class [0], TE-Class [1] and TE-Class [2], then in UnreservedBandwidth, the position of corresponding TE-Class [0], TE-Class [1] and TE-Class [2] has not been 0.Corresponding CTj and Preemption k is parsed again from Class Type and Priority, concrete LSR2 CT and Preemption parsed corresponding to TE-Class [0] from Class Type and Priority is respectively 1 and 0, but CT and Preemption can not be found in LSR2 to be respectively local TE-Class corresponding to 1 and 0, then outputting alarm message; CT and Preemption corresponding to TE-Class [1] that LSR2 parses LSR1 issue from Class Type and Priority is respectively 1 and 1, CT and Preemption corresponding to TE-Class [2] that LSR1 issues is respectively 0 and 1, in LSR2, find CT and Preemption to be respectively local TE-Class [0] corresponding to 1 and 1, be respectively the local TE-Class [1] corresponding to 0 and 1 with CT and Preemption, calculate LSP respectively according to the TE-Class [0] of this locality and TE-Class [1].
Consult Fig. 2, the embodiment of the present invention two provides a kind of receiving equipment, can be the second label switching router LSR2, comprise:
Message reception units 201, for receiving the related information for mapping TE-Class; The described related information for mapping TE-Class comprises CT and priority;
First judging unit 202, for judging whether described receiving equipment exists the local TE-Class that described CT and priority map;
Path acquiring unit 203, for when the judged result of the first judging unit 202 is for being, according to the local TE-Class that described CT and priority map, obtains label forwarding path.
Wherein, described message reception units 201 is IGP message reception units, for receiving the IGP message of carrying a sub-TLV, described sub-TLV comprises: type indication information, and the described CT corresponding with the TE-Class that the first label switching router LSR1 issues and priority.
This equipment also comprises:
Second judging unit 204, for judging whether described receiving equipment can identify the type of the sub-TLV indicated by described type indication information; Described first judging unit 202, for when the judged result of described second judging unit 204 is for being, judges whether described receiving equipment exists the local TE-Class that described CT and priority map.
Alarm information output unit 205, for when the judged result of the first judging unit 202 is no, outputting alarm message, described alarm information comprises: indicate described CT and priority can not be mapped to the information of local TE-Class.
Consult Fig. 3, the embodiment of the present invention three provides a kind of transmitting apparatus, can be the first label switching router LSR1, comprise:
Acquiring unit 301, for obtaining the related information for mapping TE-Class, the described related information for mapping TE-Class comprises: the CT corresponding to the TE-Class issued with described transmitting apparatus and priority;
Transmitting element 302, for sending the related information for mapping TE-Class that acquiring unit 301 obtains.
The embodiment of the present invention four provides a kind of network system, comprising: the first label switching router LSR1 and the second label switching router LSR2, wherein,
Described LSR1, the CT corresponding for the TE-Class sent with self issues and priority;
Described LSR2, for receiving the CT and priority that described LSR1 sends, judge whether described LSR2 exists the local TE-Class that described CT and priority map, if, according to the local TE-Class that described CT and priority map, obtain label forwarding path.
One of ordinary skill in the art will appreciate that all or part of step realized in above-described embodiment method is that the hardware that can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, such as read-only memory, disk or CD etc.
As seen from the above analysis, the embodiment of the present invention has following beneficial effect:
The embodiment of the present invention is by obtaining CT and the priority for mapping TE-Class, and utilize described CT and priority, mapping obtains local TE-Class, according to obtained local TE-Class, calculate label forwarding path, to ensure the local bandwidth of TE-Class design that basis is mapped to and the identical of expectation, the path therefore selected also conforms to the path of expection.
Above method for obtaining path, transmitting apparatus, receiving equipment and network system that the embodiment of the present invention provides are described in detail, for one of ordinary skill in the art, according to the thought of the embodiment of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. a method for obtaining path, is characterized in that, the method comprises:
Receive the related information for mapping service traffics classification TE-Class, the described related information for mapping TE-Class comprises Class Type CT and priority, be specially: the second label switching router LSR2 receives the Interior Gateway Protocol IGP message of carrying the first subtype length value sub-TLV that the first label switching router LSR1 sends, a described sub-TLV comprises: type indication information, and the described CT corresponding with the TE-Class that described LSR1 issues and priority, wherein, receive a sub-TLV of LSR1 transmission at described LSR2 before, described LSR1 determines to issue TE-Class, according to the corresponding relation of described TE-Class and CT and priority, a sub-TLV in described IGP message is set,
When there is the local TE-Class that described CT and priority map, according to described local TE-Class, obtain label forwarding path LSP.
2. method according to claim 1, is characterized in that, according to the received related information for mapping TE-Class, before obtaining the local TE-Class that described CT and priority maps, the method also comprises:
Judging whether described LSR2 can identify the type of the sub-TLV indicated by described type indication information, if so, continuing according to the received related information for mapping TE-Class, obtain the local TE-Class that described CT and priority map.
3. method according to claim 1 and 2, is characterized in that, when there is not the local TE-Class that described CT and priority map, the method also comprises:
Outputting alarm message, described alarm information comprises: indicate described CT and priority can not be mapped to the information of local TE-Class.
4. method according to claim 1 and 2, is characterized in that,
Described IGP message also carries the 2nd sub-TLV, and described 2nd sub-TLV comprises: the bandwidth numerical value that the LSP corresponding to the TE-Class that LSR1 issues provides;
According to described local TE-Class, obtain label forwarding path LSP and comprise:
According to the local TE-Class that described CT and priority map, and the bandwidth numerical value of described CT and LSP corresponding to priority, obtain label forwarding path LSP; Wherein, described CT and LSP corresponding to priority is the LSP corresponding to TE-Class of the described CT of correspondence that issues of LSR1 and priority.
5. method according to claim 3, is characterized in that,
Described IGP message also carries the 2nd sub-TLV, and described 2nd sub-TLV comprises: the bandwidth numerical value that the LSP corresponding to the TE-Class that LSR1 issues provides;
According to described local TE-Class, obtain label forwarding path LSP and comprise:
According to the local TE-Class that described CT and priority map, and the bandwidth numerical value of described CT and LSP corresponding to priority, obtain label forwarding path LSP; Wherein, described CT and LSP corresponding to priority is the LSP corresponding to TE-Class of the described CT of correspondence that issues of LSR1 and priority.
6. a receiving equipment, is characterized in that, comprising:
Message reception units, for receiving the related information for mapping service traffics classification TE-Class, the described related information for mapping TE-Class comprises Class Type CT and priority, specifically for receiving the Interior Gateway Protocol IGP message of carrying the first subtype length value sub-TLV, a described sub-TLV comprises: type indication information, and the described CT corresponding with the TE-Class that the first label switching router LSR1 issues and priority, wherein, receive a sub-TLV of described LSR1 transmission at described receiving equipment before, described LSR1 is according to the corresponding relation of described TE-Class and CT and priority, a sub-TLV in described IGP message is set,
First judging unit, for judging whether described receiving equipment exists the local TE-Class that described CT and priority map;
Path acquiring unit, for when the judged result of the first judging unit is for being, according to the local TE-Class that described CT and priority map, obtains label forwarding path.
7. equipment according to claim 6, is characterized in that, this equipment also comprises:
Second judging unit, for judging whether described receiving equipment can identify the type of the sub-TLV indicated by described type indication information;
Described first judging unit, for when the judged result of described second judging unit is for being, judges whether described receiving equipment exists the local TE-Class that described CT and priority map.
8. equipment according to claim 6, is characterized in that, this equipment also comprises:
Alarm information output unit, for when the judged result of the first judging unit is no, outputting alarm message, described alarm information comprises: indicate described CT and priority can not be mapped to the information of local TE-Class.
9. a network system, is characterized in that, comprising: the first label switching router LSR1 and the second label switching router LSR2, wherein,
Described LSR1, the Class Type CT corresponding for the service traffics classification TE-Class sent with self issues and priority, comprise: acquiring unit, for obtaining the related information for mapping TE-Class, the described related information for mapping TE-Class comprises: the Class Type CT corresponding to the TE-Class issued with described LSR1 and priority; Transmitting element, for sending the related information for mapping TE-Class that described acquiring unit obtains;
Described LSR2, for receiving CT and the priority of described LSR1 transmission, specifically for receiving the Interior Gateway Protocol IGP message of carrying the first subtype length value sub-TLV, a described sub-TLV comprises: type indication information, and the described CT corresponding with the TE-Class that described LSR1 issues and priority, judge whether described LSR2 exists the local TE-Class that described CT and priority map, if, according to the local TE-Class that described CT and priority map, obtain label forwarding path, comprise: message reception units, for receiving the related information for mapping TE-Class, the described related information for mapping TE-Class comprises CT and priority, first judging unit, for judging whether described LSR2 exists the local TE-Class that described CT and priority map, path acquiring unit, for when the judged result of the first judging unit is for being, according to the local TE-Class that described CT and priority map, obtains label forwarding path,
Wherein, before described LSR2 receives the sub-TLV that described LSR1 sends, described LSR1, according to the corresponding relation of described TE-Class and CT and priority, arranges the sub-TLV in described IGP message.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN200810126969.8A CN101610205B (en) | 2008-06-20 | 2008-06-20 | Method for obtaining path, transmitting equipment, receiving equipment and network system |
| PCT/CN2009/072337 WO2009152774A1 (en) | 2008-06-20 | 2009-06-18 | Path obtaining method, transmitting device, receiving device and the network system thereof |
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| CN200810126969.8A CN101610205B (en) | 2008-06-20 | 2008-06-20 | Method for obtaining path, transmitting equipment, receiving equipment and network system |
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| CN101610205A CN101610205A (en) | 2009-12-23 |
| CN101610205B true CN101610205B (en) | 2015-04-08 |
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| CN107181689B (en) * | 2016-03-10 | 2021-09-14 | 中兴通讯股份有限公司 | Message interaction method and device between routers |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1859371A (en) * | 2005-10-28 | 2006-11-08 | 华为技术有限公司 | Method for checking flow engineering link time slot state consistency |
| CN101090355A (en) * | 2007-07-24 | 2007-12-19 | 杭州华三通信技术有限公司 | Label exchange route setting method, system and equipment of virtual special network channel |
| CN101155131A (en) * | 2006-09-29 | 2008-04-02 | 中国电信股份有限公司 | Method for establishing label switched path of minimized path preemption cost |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8107379B2 (en) * | 2005-05-04 | 2012-01-31 | Cisco Technology, Inc. | Dynamic TE-LSP priority and preemption |
| US20070206602A1 (en) * | 2006-03-01 | 2007-09-06 | Tellabs San Jose, Inc. | Methods, systems and apparatus for managing differentiated service classes |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1859371A (en) * | 2005-10-28 | 2006-11-08 | 华为技术有限公司 | Method for checking flow engineering link time slot state consistency |
| CN101155131A (en) * | 2006-09-29 | 2008-04-02 | 中国电信股份有限公司 | Method for establishing label switched path of minimized path preemption cost |
| CN101090355A (en) * | 2007-07-24 | 2007-12-19 | 杭州华三通信技术有限公司 | Label exchange route setting method, system and equipment of virtual special network channel |
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| CN101610205A (en) | 2009-12-23 |
| WO2009152774A1 (en) | 2009-12-23 |
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