CN102223280A - Method and network element for rebuilding tunnel - Google Patents
Method and network element for rebuilding tunnel Download PDFInfo
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- CN102223280A CN102223280A CN2011101638618A CN201110163861A CN102223280A CN 102223280 A CN102223280 A CN 102223280A CN 2011101638618 A CN2011101638618 A CN 2011101638618A CN 201110163861 A CN201110163861 A CN 201110163861A CN 102223280 A CN102223280 A CN 102223280A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
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Abstract
The invention provides a method and network element for rebuilding tunnels. The method comprises the following steps: after the nodes in the tunnel label switched path (LSP) receive a first path message, during the process of establishing the path state control block for the new LSP, if the path state control block for the old LSP in the same tunnel is found, the resource plane for the new LSP is applied; and the old LSP supports the capability of separating the signaling plane from the resource plane. By adopting the method and network element for rebuilding tunnels, the efficiency of recovering the rebuilding of tunnel can be improved; the resource application can be determined; and the data stream is not lost when the MBB can not be realized.
Description
Technical field
The present invention relates to communication field, relate in particular to method and network element that MPLS-TE (Multi-Protocol Label Switching-Traffic Engineering, multiprotocol label switching-traffic engineering) tunnel restoration is rebuild.
Background technology
TE LSP (Label Switching Path, label switched path) RSVP-TE (Resource Reservation Protocol-TE is adopted in establishment, RSVP based on traffic engineering) signaling protocol carries out alternately, simultaneously by extracting the resource control plane of the image parameter establishment traffic engineering tunnel in the signaling.
As shown in Figure 1, signaling plane represents that with PSB (Path State Block, path status controll block) LSP, the dismounting of PSB can cause the release of resources such as the label, bandwidth of LSP resource control plane among the TE LSP.
In RFC3209, describe a kind of optimization heavy-route mode of traffic engineering tunnel, be referred to as MBB (Make-Before-Break builds afterwards earlier and tears open).But when the tunnel carries out restoration and reconstruction, often need at first to remove and discharge old resource after reattempt foundation and the reservation of carrying out new path resource.As shown in Figure 2, traditional tunnel restoration reconstruction mode can be removed old LSP (tunnel1:lsp1) by pathtear (path dismounting) message earlier, and then creates new LSP (tunnel1:lsp2).
Because the complexity and the non-confirmability of network traffics, after the resource control plane of old LSP discharges bandwidth resources, the resource that tunnel (tunnel) is occupied has not existed yet, at this moment as new LSP during through the node that coincides with old LSP and physical interface, there is uncertainty when applying for resource once more, might exists the physics interface band width resource to be applied for by other tunnel.
Simultaneously because the requirement of network robustness wishes that a tunnel can carry out tunnel restoration as far as possible apace and rebuild.Under the situation that can't accomplish MBB, the resource control plane of removing old LSP earlier can cause a part of data flow to lose undoubtedly.
Summary of the invention
The technical problem to be solved in the present invention provides method and the network element that a kind of tunnel rebuilds, and can improve the efficient that tunnel restoration is rebuild.
In order to solve the problems of the technologies described above, the invention provides the method that a kind of tunnel rebuilds, comprising:
After node in the tunnel label switching path (LSP) receives first PATH, in the process of the path status controll block of creating new LSP, if find the path status controll block of the old LSP in the same tunnel, then apply for the resource plane of new LSP, described old LSP supports the ability of signaling plane and resource planar separation.
Further, said method also has following characteristics:
Definition one bit represents that the resource plane of current LSP need replace the resource plane of the LSP that is associated in the same tunnel in the reserved field of the controlled state object that described first PATH carries.
Further, said method also has following characteristics:
Described first PATH also carries the affiliated partner of the old LSP of record sign, and described node is to identify the path status controll block of searching old LSP according to described old LSP.
Further, said method also has following characteristics: the resource plane of the new LSP of described node application comprises:
Described node is reserved the required resource plane of new LSP from the resource plane that described old LSP has applied for, if there is residue on the resource plane that old LSP has applied for after reserving, then discharge the residual resource plane.
Further, said method also has following characteristics: after the required resource plane of the new LSP of described reservation, also comprise:
To the path status controll block of old LSP be provided with the expression signaling plane with the sign of resource planar separation.
Further, said method also has following characteristics: also comprise:
After described node receives second PATH, indication according to second PATH is carried out mark to the path status controll block of the LSP of correspondence, the ability of representing this path status controll block support signaling plane and resource planar separation, wherein, definition one bit in the reserved field of the controlled state object that second PATH carries represents that current LSP possesses the ability of resource planar separation control.
Further, said method also has following characteristics: also comprise:
After described node receives the path tear down message, if be checked through corresponding path status controll block be provided with the expression signaling plane with the sign of resource planar separation, then only remove the signaling plane of this path status controll block correspondence; If be checked through corresponding path status controll block be not provided with the expression signaling plane with the sign of resource planar separation, then remove the signaling plane of this path status controll block correspondence, discharge the resource plane of this path status controll block correspondence simultaneously.
In order to address the above problem, the invention provides a kind of network element, the node as in the tunnel label switching path (LSP) comprises:
Creation module, be used to receive first PATH after, create the path status controll block of new LSP;
The resource processing module, be used for creating the process of the path status controll block of new LSP in described creation module, if find the path status controll block of the old LSP in the same tunnel, the resource plane of then applying for new LSP, described old LSP supports the ability of signaling plane and resource planar separation.
Further, said network element also has following characteristics:
Described resource processing module, be used for applying for that the resource plane of new LSP comprises: reserve the required resource plane of new LSP from the resource plane that described old LSP has applied for, if there is residue on the resource plane that old LSP has applied for after reserving, then discharge the residual resource plane.
Further, said network element also has following characteristics:
Described resource processing module is reserved and also is used for after the required resource plane of new LSP, to the path status controll block of old LSP be provided with the expression signaling plane with the sign of resource planar separation.
Further, said network element also has following characteristics: also comprise:
Mark module, after being used to receive second PATH, indication according to second PATH is carried out mark to the path status controll block of the LSP of correspondence, the ability of representing this path status controll block support signaling plane and resource planar separation, wherein, definition one bit in the reserved field of the controlled state object that second PATH carries represents that current LSP possesses the ability of resource planar separation control.
Further, said network element also has following characteristics: also comprise:
Described resource processing module, after also being used to receive the path tear down message, if be checked through corresponding path status controll block be provided with the expression signaling plane with the sign of resource planar separation, then only remove the signaling plane of this path status controll block correspondence; If be checked through corresponding path status controll block be not provided with the expression signaling plane with the sign of resource planar separation, then remove the signaling plane of this path status controll block correspondence, discharge the resource plane of this path status controll block correspondence simultaneously.
To sum up, the invention provides method and network element that a kind of tunnel rebuilds, can improve the efficient that tunnel restoration is rebuild, can determine to apply for resource, under the situation that can't accomplish MBB, can not cause data flow to lose.
Description of drawings
Fig. 1 is the schematic diagram that concerns on the signaling plane of prior art and resource plane;
Fig. 2 is the schematic diagram of traditional tunnel restoration reconstruction mode;
Fig. 3 is the schematic diagram of network element of the present invention;
Fig. 4 is the flow chart of the method for tunnel of the present invention reconstruction;
Fig. 5 is the flow chart of the tunnel of the embodiment of the invention method of rebuilding.
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.
Fig. 3 is the schematic diagram of the network element of the embodiment of the invention, as shown in Figure 3, when the network element of present embodiment during as the node among the tunnel LSP, comprising:
Creation module, be used to receive first PATH after, create the path status controll block of new LSP;
The resource processing module, be used for creating the process of the path status controll block of new LSP in described creation module, if find the path status controll block of the old LSP in the same tunnel, the resource plane of then applying for new LSP, described old LSP supports the ability of signaling plane and resource planar separation.
Wherein, described resource processing module is used for applying for that the resource plane of new LSP comprises: reserve the required resource plane of new LSP from the resource plane that described old LSP has applied for, if there is residue on the resource plane that old LSP has applied for after reserving, then discharge the residual resource plane.
Wherein, described resource processing module is reserved and also is used for after the required resource plane of new LSP, to the path status controll block of old LSP be provided with the expression signaling plane with the sign of resource planar separation.
Wherein, described resource processing module can also be used for, after receiving the path tear down message, if be checked through corresponding path status controll block be provided with the expression signaling plane with the sign of resource planar separation, then only remove the signaling plane of this path status controll block correspondence; If be checked through corresponding path status controll block be not provided with the expression signaling plane with the sign of resource planar separation, then remove the signaling plane of this path status controll block correspondence, discharge the resource plane of this path status controll block correspondence simultaneously.
The network element of present embodiment can also comprise:
Mark module, after being used to receive second PATH, indication according to second PATH is carried out mark to the path status controll block of the LSP of correspondence, the ability of representing this path status controll block support signaling plane and resource planar separation, wherein, definition one bit in the reserved field of the controlled state object that second PATH carries represents that current LSP possesses the ability of resource planar separation control.
Fig. 4 is the flow chart of the tunnel of the embodiment of the invention method of rebuilding, and as shown in Figure 4, the method for present embodiment comprises following step:
After node among S10, the tunnel LSP receives first PATH, in the path status controll block of creating new LSP;
S20, in the process of the path status controll block of creating new LSP, if find the path status controll block of the old LSP in the same tunnel, the resource plane of then applying for new LSP, described old LSP supports the ability of signaling plane and resource planar separation.
The method that the tunnel that the embodiment of the invention proposes rebuilds by the field in expansion RSVP signaling Admin_Status (controlled state) object, is carried out the independent control of resource control plane.
Present embodiment has been expanded Reserved (reservation) field of the Admin_Statuc object in the RSVP signaling in existing ietf standard, defined 3 new Bit positions.
The bit position of expansion is called:
The S position, 23bit is used to represent that current LSP possesses the ability of resource planar separation control;
The W position, 22bit is used to represent that the resource plane of current LSP separates with signaling plane;
The O position, 21bit is used to represent that the resource plane of current LSP need replace the resource plane of the LSP that is associated in the same tunnel.
Need to use Association (association) object to be used for writing down the sign (lspId) of old LSP simultaneously in the Path message of new LSP.
Present embodiment comprises following step:
Step 100, announcement LSP support the ability that signaling plane separates with the resource control plane, specifically can comprise following step:
The first node in step 101, tunnel has carried the Admin_Status object that the S position is set in the Path message that sends, the first node of announcing LSP has downstream possessed the ability that signaling plane separates with the resource control plane;
Each node among step 102, the LSP all can write down this mark in PSB after receiving the Path message that is provided with the S position, the local LSP node of expression is supported the separating controlling of signaling plane and resource control plane;
Need carry the Admin_Status object that is provided with the S position equally in the Resv of step 103, LSP (reservation) message, if comprise the S position in the Resv message, but local PSB does not contain S position mark, then abandons Resv message, and sends PathErr (path error) message to tunnel first node;
Step 104, after tunnel first node is received the Resv message that contains the S position, can think that whole LSP has possessed the ability of signaling plane and resource planar separation control.
Step 200, create new LSP, and, can comprise following step signaling plane and the resource planar separation of old LSP, as shown in Figure 5:
Step 201, when the first node in tunnel under the situation of not using MBB in tunnel of restoration and reconstruction, first node at first can send a new Path message, except carrying the Admin_Status object of O position, also carried the Association object of the lspId that writes down old LSP simultaneously in this message;
Node in step 202, the LSP path when creating new PSB, also needs to search the old PSB that needs are replaced according to the lspId in the Association object after receiving the Path message that contains the O position;
If can't find old PSB, represent that then new LSP has passed through the never node of process of old LSP, so new PSB applies for the resource plane of oneself voluntarily;
If the S position mark that is provided with in the middle of the old PSB that finds, the resource plane of then representing old PSB allows to separate with signaling plane, in this case, present node can be in the resource plane of reserving new LSP, can discharge the resource plane of old LSP, the forwarding of new LSP simultaneously is set to effectively, and the user can customize the strategy that resource is replaced voluntarily;
For example, strategy 1: new LSP oneself application resource plane, do not reserve from the inside, resource plane of old LSP.
Strategy 2: the resource plane of new LSP must be reserved from the resource plane of old LSP, if the resource plane of old LSP is not enough, thinks that then new LSP creates failure, and failure cause is to be left to the resource that needs in advance, etc.
If find old PSB, but the S position mark that is not provided with, new psb also applies for the resource plane of oneself voluntarily.
After the resource plane of confirming old LSP has discharged, the S position of the PSB of old LSP correspondence is resetted, the W position is set simultaneously, the expression signaling plane with the resource planar separation.
The Resv message of step 203, new LSP is carried S and O position, on the way the O position among each node PSB is resetted, and resets the S position;
The first node in step 204, tunnel just thinks that new LSP has finished resource foundation after receiving the Resv message that contains the O position, the resource plane of old LSP discharges simultaneously, and at this moment first node can send the signaling plane that Pathtear message is removed old LSP;
Each node among step 205, the LSP is searched corresponding PSB after receiving PathTear message, check whether corresponding PSB is provided with the W position, if, then only remove signaling plane, no longer discharge the resource on resource plane; If corresponding PSB is not provided with the W position, represent that then old LSP exists new LSP not have the node of process, the resource plane of old LSP still exists, and at this moment also needs to discharge the resource plane when removing signaling plane.
In a preferred embodiment, the resource plane of new LSP can preferentially ask from the resource plane of old LSP, discharges old LSP remainder resource then, and the S position with old PSB resets simultaneously, and the W position is set, and represents that old PSB only keeps signaling status.
Compared with prior art, the present invention is used for increasing in traffic engineering tunnel the control isolation technics on signaling plane and resource plane, and the resource on resource plane discharges the dismounting that relies on the signaling plane status block no longer fully, can independently discharge.Concrete advantage is embodied in:
1, do not worry that old LSP removes in the conventional tunnel restoration and reconstruction after, interface reclaims the bandwidth resources of tunnel, the uncertainty that whether can apply for when new LSP creates.When each node can be set different resource replacement policies, even can directly the resource of old LSP be given new LSP resource plane and seize and do not discharge, promptly new LSP can obtain the bandwidth identical with old LSP, label etc.;
2, improved the time that tunnel restoration is rebuild, the conventional tunnel restoration and reconstruction need wait for that old LSP removes the clean establishment that could begin new LSP afterwards fully with the resource plane, method provided by the invention can be created new LSP earlier and directly replace old LSP resource plane, and it is effective that the data forwarding plane is set, new LSP creates and can think that successfully the tunnel recovers, and the dismounting of old LSP signaling plane can not influence the time that whole tunnel restoration is rebuild.
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.
Below only be the preferred embodiments of the present invention; certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (12)
1. the tunnel method of rebuilding comprises:
After node in the tunnel label switching path (LSP) receives first PATH, in the process of the path status controll block of creating new LSP, if find the path status controll block of the old LSP in the same tunnel, then apply for the resource plane of new LSP, described old LSP supports the ability of signaling plane and resource planar separation.
2. the method for claim 1 is characterized in that:
Definition one bit represents that the resource plane of current LSP need replace the resource plane of the LSP that is associated in the same tunnel in the reserved field of the controlled state object that described first PATH carries.
3. method as claimed in claim 2 is characterized in that:
Described first PATH also carries the affiliated partner of the old LSP of record sign, and described node is to identify the path status controll block of searching old LSP according to described old LSP.
4. the method for claim 1, it is characterized in that: the resource plane of the new LSP of described node application comprises:
Described node is reserved the required resource plane of new LSP from the resource plane that described old LSP has applied for, if there is residue on the resource plane that old LSP has applied for after reserving, then discharge the residual resource plane.
5. method as claimed in claim 4 is characterized in that: after the required resource plane of the new LSP of described reservation, also comprise:
To the path status controll block of old LSP be provided with the expression signaling plane with the sign of resource planar separation.
6. as each described method of claim 1-5, it is characterized in that: also comprise:
After described node receives second PATH, indication according to second PATH is carried out mark to the path status controll block of the LSP of correspondence, the ability of representing this path status controll block support signaling plane and resource planar separation, wherein, definition one bit in the reserved field of the controlled state object that second PATH carries represents that current LSP possesses the ability of resource planar separation control.
7. as each described method of claim 1-5, it is characterized in that: also comprise:
After described node receives the path tear down message, if be checked through corresponding path status controll block be provided with the expression signaling plane with the sign of resource planar separation, then only remove the signaling plane of this path status controll block correspondence; If be checked through corresponding path status controll block be not provided with the expression signaling plane with the sign of resource planar separation, then remove the signaling plane of this path status controll block correspondence, discharge the resource plane of this path status controll block correspondence simultaneously.
8. network element, the node as in the tunnel label switching path (LSP) comprises:
Creation module, be used to receive first PATH after, create the path status controll block of new LSP;
The resource processing module, be used for creating the process of the path status controll block of new LSP in described creation module, if find the path status controll block of the old LSP in the same tunnel, the resource plane of then applying for new LSP, described old LSP supports the ability of signaling plane and resource planar separation.
9. network element as claimed in claim 8 is characterized in that:
Described resource processing module, be used for applying for that the resource plane of new LSP comprises: reserve the required resource plane of new LSP from the resource plane that described old LSP has applied for, if there is residue on the resource plane that old LSP has applied for after reserving, then discharge the residual resource plane.
10. network element as claimed in claim 9 is characterized in that:
Described resource processing module is reserved and also is used for after the required resource plane of new LSP, to the path status controll block of old LSP be provided with the expression signaling plane with the sign of resource planar separation.
11., it is characterized in that: also comprise as each described network element of claim 8-10:
Mark module, after being used to receive second PATH, indication according to second PATH is carried out mark to the path status controll block of the LSP of correspondence, the ability of representing this path status controll block support signaling plane and resource planar separation, wherein, definition one bit in the reserved field of the controlled state object that second PATH carries represents that current LSP possesses the ability of resource planar separation control.
12., it is characterized in that as each described network element of claim 8-10:
Described resource processing module, after also being used to receive the path tear down message, if be checked through corresponding path status controll block be provided with the expression signaling plane with the sign of resource planar separation, then only remove the signaling plane of this path status controll block correspondence; If be checked through corresponding path status controll block be not provided with the expression signaling plane with the sign of resource planar separation, then remove the signaling plane of this path status controll block correspondence, discharge the resource plane of this path status controll block correspondence simultaneously.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110163861.8A CN102223280B (en) | 2011-06-17 | 2011-06-17 | Method and network element for rebuilding tunnel |
| PCT/CN2012/072361 WO2012171368A1 (en) | 2011-06-17 | 2012-03-15 | Tunnel reestablishment method and network element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110163861.8A CN102223280B (en) | 2011-06-17 | 2011-06-17 | Method and network element for rebuilding tunnel |
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| CN102223280A true CN102223280A (en) | 2011-10-19 |
| CN102223280B CN102223280B (en) | 2017-04-12 |
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| CN201110163861.8A Expired - Fee Related CN102223280B (en) | 2011-06-17 | 2011-06-17 | Method and network element for rebuilding tunnel |
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| CN (1) | CN102223280B (en) |
| WO (1) | WO2012171368A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102710505A (en) * | 2012-05-16 | 2012-10-03 | 中兴通讯股份有限公司 | Method and system for deploying tunnel services |
| WO2012171368A1 (en) * | 2011-06-17 | 2012-12-20 | 中兴通讯股份有限公司 | Tunnel reestablishment method and network element |
| CN108768858A (en) * | 2018-05-08 | 2018-11-06 | 烽火通信科技股份有限公司 | MBB based on bandwidth calculates path method and system |
| CN109428852A (en) * | 2017-07-18 | 2019-03-05 | 中兴通讯股份有限公司 | Communication tunnel end-point addresses separation method, terminal, ePDG and storage medium |
| CN110392318A (en) * | 2019-07-29 | 2019-10-29 | 烽火通信科技股份有限公司 | The method of calibration and system in the channel plane layer LSP are controlled in ASON |
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| CN102223280B (en) * | 2011-06-17 | 2017-04-12 | 中兴通讯股份有限公司 | Method and network element for rebuilding tunnel |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012171368A1 (en) * | 2011-06-17 | 2012-12-20 | 中兴通讯股份有限公司 | Tunnel reestablishment method and network element |
| CN102710505A (en) * | 2012-05-16 | 2012-10-03 | 中兴通讯股份有限公司 | Method and system for deploying tunnel services |
| CN102710505B (en) * | 2012-05-16 | 2015-03-25 | 中兴通讯股份有限公司 | Method and system for deploying tunnel services |
| CN109428852A (en) * | 2017-07-18 | 2019-03-05 | 中兴通讯股份有限公司 | Communication tunnel end-point addresses separation method, terminal, ePDG and storage medium |
| CN109428852B (en) * | 2017-07-18 | 2023-09-15 | 中兴通讯股份有限公司 | Communication tunnel endpoint address separation method, terminal, ePDG and storage medium |
| CN108768858A (en) * | 2018-05-08 | 2018-11-06 | 烽火通信科技股份有限公司 | MBB based on bandwidth calculates path method and system |
| CN108768858B (en) * | 2018-05-08 | 2021-08-03 | 烽火通信科技股份有限公司 | MBB path calculation method and system based on bandwidth |
| CN110392318A (en) * | 2019-07-29 | 2019-10-29 | 烽火通信科技股份有限公司 | The method of calibration and system in the channel plane layer LSP are controlled in ASON |
| CN110392318B (en) * | 2019-07-29 | 2021-10-19 | 烽火通信科技股份有限公司 | Method and system for checking control plane layer LSP (Label switched Path) in ASON (automatic switched optical network) |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012171368A1 (en) | 2012-12-20 |
| CN102223280B (en) | 2017-04-12 |
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