CN101197759A - Label distribution device used for informing upper course to distribute label in label distribution protocol - Google Patents
Label distribution device used for informing upper course to distribute label in label distribution protocol Download PDFInfo
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- CN101197759A CN101197759A CNA2006101610575A CN200610161057A CN101197759A CN 101197759 A CN101197759 A CN 101197759A CN A2006101610575 A CNA2006101610575 A CN A2006101610575A CN 200610161057 A CN200610161057 A CN 200610161057A CN 101197759 A CN101197759 A CN 101197759A
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Abstract
The invention provides a label distribution device used to inform upstream of distributing labels in the label distribution protocol. The device comprises: a carrying and sending unit positioned at the downstream and used to carry a special label type TLV in a label request message sent to the upstream; an analytic unit positioned at the upstream and used to analyze the special label type TLV after the label request message with the special label type TLV is received; and a distribution unit used to distribute the label with corresponding type for forwarding equivalence class according to the field value in the special label type TLV. So an upstream LSR as the penultimate hop of a certain FEC can distribute an implicit null label to the FEC to be taken as an out-label under the upstream label distribution mode, thereby realizing the pop-up of the penultimate hop.
Description
Technical field
The present invention relates to multiprotocol label switching (Multi Protocol Label Switch, be designated hereinafter simply as MPLS) tag distribution protocol (Label Distribute Protocol in the network, be designated hereinafter simply as LDP) technology, more specifically, relate to a kind of label distribution device that is used at tag distribution protocol notice upstream distribution label.
Background technology
Usually, at a strip label switching path (Label Switch Path, be designated hereinafter simply as LSP) final jump, LSR (Label Switch Router, be designated hereinafter simply as LSR) can give empty label of corresponding forwarding equivalence class (Forwading Equivalence Class is designated hereinafter simply as FEC) binding as going into label (implicit-null or explicit-null).
The purpose of distributing implicit-null is in order to tell time LSR of end jumping by this label, when receiving the label packet that mails to this FEC, after will going into the label ejection, inferior end jumping LSR no longer outgoing label is pressed into label stack, just become a common IP message when message arrives final jump like this, the LSR of final jump does not need to do the work of ejecting label again, directly searches routing table and transmits just passable.
But, outgoing label in upstream distribution label mode middle and upper reaches is distributed by upstream oneself, the upstream can not know it oneself is time end jumping of this FEC, therefore also can't distribute the outgoing label of an implicit-null label as oneself, and can only distribute a common label, cause carrying out time last ricochet and go out, message arrives the common label that remains that final jump carries later on.
Therefore, need a kind of label distribution device that is used at tag distribution protocol notice upstream distribution label, to address the above problem.
Summary of the invention
For time last upstream LSR that jumps as certain FEC can be given implicit-null label of this FEC distribution as outgoing label, thereby realize that inferior last ricochet goes out under the upper tag distribution mode.The invention provides a kind of label distribution device that is used at tag distribution protocol notice upstream distribution label, solved the problems referred to above.
The invention provides a kind of label distribution device, be used at tag distribution protocol notice upstream distribution label, this device comprises: carry transmitting element, be positioned at the downstream, be used for carrying the type-length-value (Type-Length-Value is designated hereinafter simply as TLV) of specific label type at the label request message that sends to the upstream; And resolution unit, be positioned at the upstream, be used for after receiving the label request message that has specific label type TLV, resolve specific label type TLV; And allocation units, the field value that is used for according to specific label type TLV is the label that forwarding equivalence class distributes respective type.
According to the present invention, this device also comprises: message sending unit, be positioned at the upstream, and when being used for can not distributing the label of respective type according to the field value of specific label type TLV, send a notification message downstream in the upstream.
In addition, according to the present invention, allocation units also are used for when label request message does not carry specific label type TLV, for forwarding equivalence class distributes common label.
It is one of following that field value among the specific label type TLV of the present invention comprises: 0, and be used for expression and distribute common label; 1, be used for expression and distribute the explicit-null label; And 2, be used for expression and distribute the implicit-null label.
Therefore, pass through foregoing description, we can find to have realized following technique effect among the present invention: the upstream LSR as the last two jump of certain FEC can be under the upper tag distribution mode, give implicit-null label of this FEC distribution as outgoing label, rather than common label, thereby can go out with the same time last ricochet that carries out under the label distribution pattern of downstream, and then improve forward efficiency.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the flow chart that is used at the label distribution method of tag distribution protocol notice upstream distribution label according to of the present invention;
Fig. 2 is the view of the form of tag types TLV according to an embodiment of the invention; And
Fig. 3 is the block diagram that is used at the label distribution device of tag distribution protocol notice upstream distribution label according to of the present invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
The tag types TLV that focuses on carrying in the label request message of LDP of the present invention upstream illustrates the label that needs what type of distribution, below will be elaborated as emphasis.
Fig. 1 is the flow chart that is used at the label distribution method of tag distribution protocol notice upstream distribution label according to of the present invention.Fig. 2 is the view of the form of tag types TLV according to an embodiment of the invention.
Hereinafter with reference to Fig. 2, the label distribution method that is used for distributing in tag distribution protocol notice upstream label is as shown in Figure 1 described.This method may further comprise the steps:
Step S102 carries specific label type TLV in the label request message that is sent to the upstream by the downstream;
Step S104 after the upstream receives the label request message that has specific label type TLV, resolves specific label type TLV, and is the label of forwarding equivalence class distribution respective type according to the field value among the specific label type TLV.
In the present invention, it should be noted that, then send a notification message downstream if the label of respective type can not be distributed according to the field value among the specific label type TLV in the upstream; If in label request message, do not carry specific label type TLV, then distribute common label for forwarding equivalence class.
And as shown in Figure 2, when the value of Value was 0, the request upstream needle was distributed a common label to certain FEC; When the value of Value was 1, the request upstream needle was distributed an explicit-null label to certain FEC; And when the value of Value was 2, the request upstream needle was distributed an implicit-null label to certain FEC.
Downstream LSR when LSR upstream sends label request message, the value of filling in the Value among the tag types TLV according to self needed tag types.
Fig. 3 is the block diagram that is used at the label distribution device 300 of tag distribution protocol notice upstream distribution label according to of the present invention.As shown in Figure 3, label distribution device 300 of the present invention comprises: carry transmitting element 302, be positioned at the downstream, be used for carrying specific label type TLV at the label request message that sends to the upstream; Resolution unit 304 is positioned at the upstream, is used for after receiving the label request message that has specific label type TLV, resolves specific label type TLV; And allocation units 306, the field value that is used for according to specific label type TLV is the label that forwarding equivalence class distributes respective type, wherein, allocation units 306 also are used for when label request message does not carry specific label type TLV, for forwarding equivalence class distributes common label.
In addition, dispensing device 300 of the present invention also comprises: message sending unit 308, be positioned at the upstream, and when being used for can not distributing the label of respective type according to the field value of specific label type TLV, send a notification message downstream in the upstream.
It is one of following that field value among the specific label type TLV comprises: 0, and be used for expression and distribute common label; 1, be used for expression and distribute the explicit-null label; And 2, be used for expression and distribute the implicit-null label.
As mentioned above, the present invention has realized following technique effect:
Time last upstream LSR that jumps as certain FEC can be under the upper tag distribution mode, distribute an implicit-null label rather than common label as outgoing label for this FEC, thereby can go out with the same time last ricochet that carries out under the label distribution pattern of downstream, and then improve forward efficiency.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.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 (4)
1. a label distribution device that is used at tag distribution protocol notice upstream distribution label is characterized in that, comprising:
Carry transmitting element, be positioned at the downstream, be used for carrying the type-length-value of specific label type at the label request message that sends to described upstream; And resolution unit, be positioned at the upstream, be used for behind the described label request message that receives the type-length-value that has described specific label type, resolving the type-length-value of described specific label type; And
Allocation units, the field value that is used for according to the type-length-value of described specific label type is the label that forwarding equivalence class distributes respective type.
2. the label distribution device that is used at tag distribution protocol notice upstream distribution label according to claim 1 is characterized in that, also comprises:
Message sending unit is positioned at described upstream, when being used in described upstream distributing the label of respective type according to the field value of the type-length-value of described specific label type, sends a notification message to described downstream.
3. the label distribution device that is used at tag distribution protocol notice upstream distribution label according to claim 1, it is characterized in that, described allocation units also are used for when described label request message does not carry the type-length-value of described specific label type, for described forwarding equivalence class distributes common label.
4. according to each described label distribution device that is used at tag distribution protocol notice upstream distribution label in the claim 1 to 3, it is characterized in that it is one of following that the field value in the type-length-value of described specific label type comprises:
0, be used for expression and distribute common label;
1, be used for expression and distribute the explicit-null label; And
2, be used for expression and distribute the implicit-null label.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2006101610575A CN101197759A (en) | 2006-12-04 | 2006-12-04 | Label distribution device used for informing upper course to distribute label in label distribution protocol |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2006101610575A CN101197759A (en) | 2006-12-04 | 2006-12-04 | Label distribution device used for informing upper course to distribute label in label distribution protocol |
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| CN101197759A true CN101197759A (en) | 2008-06-11 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012145886A1 (en) * | 2011-04-25 | 2012-11-01 | 华为技术有限公司 | Measurement method, apparatus and system based on labels |
| WO2014048120A1 (en) * | 2012-09-29 | 2014-04-03 | 华为技术有限公司 | Method, network node and system for implementing point-to-miltipoint multicast |
| CN104142816A (en) * | 2013-05-10 | 2014-11-12 | 中国电信股份有限公司 | User card and CDMA (code division multiple access) short message analyzing method thereof |
| CN104365071A (en) * | 2012-04-04 | 2015-02-18 | 阿尔卡特朗讯公司 | System and method for implementing multiple label distributon protocol (ldp) instances in a network node |
| CN108132999A (en) * | 2017-12-21 | 2018-06-08 | 恒宝股份有限公司 | The processing method and system of a kind of masurium |
| CN109361782A (en) * | 2018-11-02 | 2019-02-19 | 迈普通信技术股份有限公司 | A kind of message forwarding method and the network equipment |
| CN111490941A (en) * | 2020-01-20 | 2020-08-04 | 新华三信息安全技术有限公司 | Multi-protocol label switching MP L S label processing method and network equipment |
-
2006
- 2006-12-04 CN CNA2006101610575A patent/CN101197759A/en not_active Withdrawn
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103053133A (en) * | 2011-04-25 | 2013-04-17 | 华为技术有限公司 | Measurement method, apparatus and system based on labels |
| WO2012145886A1 (en) * | 2011-04-25 | 2012-11-01 | 华为技术有限公司 | Measurement method, apparatus and system based on labels |
| CN103053133B (en) * | 2011-04-25 | 2016-07-13 | 华为技术有限公司 | A kind of measuring method based on label, device and system |
| US9584396B2 (en) | 2011-04-25 | 2017-02-28 | Huawei Technologies Co., Ltd. | Label-based measurement method, apparatus, and system |
| CN104365071A (en) * | 2012-04-04 | 2015-02-18 | 阿尔卡特朗讯公司 | System and method for implementing multiple label distributon protocol (ldp) instances in a network node |
| CN104365071B (en) * | 2012-04-04 | 2017-10-24 | 阿尔卡特朗讯公司 | System and method for implementing multiple tag distribution protocols (LDP) example within network nodes |
| US10225091B2 (en) | 2012-09-29 | 2019-03-05 | Huawei Technologies Co., Ltd. | Method for implementing point-to-multipoint multicast, network node, and system |
| WO2014048120A1 (en) * | 2012-09-29 | 2014-04-03 | 华为技术有限公司 | Method, network node and system for implementing point-to-miltipoint multicast |
| CN104142816A (en) * | 2013-05-10 | 2014-11-12 | 中国电信股份有限公司 | User card and CDMA (code division multiple access) short message analyzing method thereof |
| CN108132999A (en) * | 2017-12-21 | 2018-06-08 | 恒宝股份有限公司 | The processing method and system of a kind of masurium |
| CN109361782A (en) * | 2018-11-02 | 2019-02-19 | 迈普通信技术股份有限公司 | A kind of message forwarding method and the network equipment |
| CN111490941A (en) * | 2020-01-20 | 2020-08-04 | 新华三信息安全技术有限公司 | Multi-protocol label switching MP L S label processing method and network equipment |
| CN111490941B (en) * | 2020-01-20 | 2022-07-12 | 新华三信息安全技术有限公司 | Multi-protocol label switching MPLS label processing method and network equipment |
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