CN100433721C - Method for processing label binding - Google Patents
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- CN100433721C CN100433721C CNB2006100019817A CN200610001981A CN100433721C CN 100433721 C CN100433721 C CN 100433721C CN B2006100019817 A CNB2006100019817 A CN B2006100019817A CN 200610001981 A CN200610001981 A CN 200610001981A CN 100433721 C CN100433721 C CN 100433721C
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Abstract
The present invention discloses a method for processing label binding, which comprises the following steps that: a. whether the received label binding is activated label binding or free label binding is judged, if the label binding is activated label binding, step B is executed, otherwise, step C is executed; B. the current processing flow after establishing a main list item in a label forwarding table is completed according to the activated label binding; C. for the free label having a main list item, a backup list item is established according to the input label of the main list item and the free label binding, and the association relation between the main list item and the backup list item is established. When the technical scheme provided by the present invention is used, the processing capacity that an LSR switches label switching paths can be reduced, and simultaneously, the time needed for switching the label switching paths is shortened.
Description
Technical field
The present invention relates to data packet switching, particularly relate to a kind of method of in the multiprotocol label switching territory, handling label binding.
Background technology
In the network that adopts multiprotocol label switching (MPLS, Multi-Protocol Label Switching), packet is by short and the label of fixed length is packaged, and transmits according to label.Label is the short identifier that this equipment meaning was fixed, only had to a length, is used to identify a forwarding equivalence class (FEC, Forwarding Equivalence Class).The network element of finishing the packet forwarding is LSR (LSR, Label Switching Router).In the MPLS system, the label binding decision of specific label being distributed to specific FEC by in the bag bang path relatively the downstream LSR of more close destination make, and announce to the upstream LSR in more close source relatively in the bag bang path by downstream LSR.Article one, all LSR on the complete bag bang path constitute label switched path (LSP, LabelSwitched Path).
Fig. 1 has illustrated a simple LSP.In Fig. 1, it is LSR1 that tentation data wraps in the last purpose LSR that transmits of LSP, and source LSR is LSR5, and the process of then announcing label binding from LSR1 to LSR5 successively is as follows:
Step 11, LSR1 is to LSR2 announcement label binding L1;
Step 12, LSR2 receives after the next label binding of LSR1, to LSR4 announcement label binding L2, to LSR3 announcement label binding L3;
Step 13, LSR3 receives after the next label binding of LSR2, to LSR4 announcement label binding L4;
Step 14, LSR4 receives label binding L2 and L4 respectively from LSR2 and LSR3.For LSR4, from the routing forwarding angle, the sender LSR3 of L4 is not next jumping of specifying FEC.Therefore, have only L2 to be activated for label forwarding on the LSR4, and L4 is kept at this locality by LSR4 but is not used in label forwarding, is in free state;
Step 15 is after LSR4 receives label binding L2 from LSR2, to LSR5 announcement label binding L5.
Like this, one is passed through LSR4 and LSR2 from LSR5, and the LSP that arrives LSR1 has just set up.In above step,, only receive after the label binding that downstream LSR sends that LSR announcement upstream is for the label binding of this FEC for certain LSR for specific FEC, this rule is called orderly label distribution pattern.
If the communication link fails between LSR2 and the LSR4, perhaps LSR2 reclaims label binding L2 to the LSR4 announcement, will cause the LSP of current employing to interrupt.At this moment, the packet that mails to LSR1 from LSR5 just can only pass through another LSP, promptly from LSR5, passes through LSR4, LSR3 and LSR2 successively, arrives LSR1.In order to switch to new LSP from the LSP that interrupts, in the prior art, the operating process on the LSR4 is as follows:
Step 21, LSR perceives and downstream LSR by detection means, i.e. interrupted communication link between the LSR2, perhaps label binding L2 is reclaimed by the LSR2 announcement;
Step 22, LSR upstream, i.e. receipts message is signed back in LSR5 issue of bidding documents, reclaims label binding;
Step 23 activates label binding L4;
Step 24 sends out label binding new to LSR5.
Why need to reclaim label to LSR5 earlier and activate L4 again, and then, be that LSR4 only after receiving L2, just can upstream announce L5 because under orderly label distribution pattern to the label binding that LSR5 sends out new again.Interrupted communication link between LSR4 and LSR2, when perhaps L2 is reclaimed by the LSR2 announcement,, need to reclaim earlier label binding L5 for keeping the order of label distribution, next LSR4 just attempts setting up new LSP, if success is again to the new label binding of LSR5 announcement.
This shows that the shortcoming of prior art is, retransmits label binding again owing to need to reclaim label binding earlier, the switching of finishing LSP needs considerable time.From experimental data, the time that needs is a second level.This not only can consume the big energy-handling capability of LSR, can make that also the break period of LSP is long, has a strong impact on the business to sensitivity break time.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method of handling label binding, reduces the treating capacity of LSR when handoff label switched path, the needed time when shortening handoff label switched path simultaneously.
In order to achieve the above object, the invention provides a kind of method of handling label binding, this method may further comprise the steps:
The label binding that A, judgement are received is to activate label binding or free label binding, if activate then execution in step B of label binding, otherwise execution in step C;
B, activate label binding according to this and mainly finish current handling process after with list item setting up in the Label Forwarding Information Base;
C, for there being main free label with list item, according to main going into label and should free label binding create standby list item with list item, if it is a plurality of that main standby list item with list item has, then should lead and be undertaken related by pointer or array with a plurality of standby list items of list item and this.
Wherein, the described judgement label binding of receiving is to activate label binding or free label binding is:
Judge whether the LSR LSR that sends this label binding is to specify forwarding equivalence class next jumping on the route meaning,, otherwise think that this label binding is free label binding if think that then this label binding is the activation label binding.
Wherein, step B further comprises:
The label binding of LSR announcement upstream.
Wherein, step B further comprises:
The corresponding free label binding of the activation label binding that judges whether and receive, if having then set up standby list item according to free label binding, and should standby list item related with main usefulness list item.
Wherein, setting up the master described in the step B with list item is: being provided for distinguishing list item in the list item data structure is main tag field with list item;
The method of creating standby list item described in the step C is: be provided for distinguishing the tag field that list item is standby list item in the list item data structure.
Wherein, this method further is included in the list item data structure pointer is set;
In step C, be to be undertaken related with described a plurality of standby list items by pointer with list item described master, and method that should association comprises: order is main with one in the standby list item of pointed in the list item data structure, makes the backing sheet item number point to other standby list items successively according to the pointer in the structure.
Wherein, this method further is included as each and goes into label and a pointer is set, array of this pointed;
In step C, be with described main undertaken by array with list item and described a plurality of standby list items related, the identical pointer array pointed of going into label that this array is had with list item and this a plurality of standby list item for this master.
When label switching path LSP changed, this method further may further comprise the steps:
D, what judge the LSP correspondence change is main with list item or standby list item, if main with list item execution in step E then, otherwise execution in step F;
E, order are main unavailable with list item, and judge whether to exist with main with the related standby list item of list item, if exist then activate standby list item and finish current handling process, otherwise behind the label binding of the LSR initiation upstream recovery process and finish current handling process;
F, make standby list item unavailable.
Wherein, being provided for distinguishing list item and being main in the list item data structure still is the tag field of standby list item with list item, the LSP correspondence that described judgement changes be that the master is with list item or standby list item:
Judge that according to the tag field in the pairing list item of the LSP that changes this list item is main with list item or standby list item.
Wherein, the described order mainly unavailablely with list item is: should lead and delete from Label Forwarding Information Base with list item;
Describedly make that standby list item is unavailable to be: should from Label Forwarding Information Base, delete by standby list item.
Wherein, be provided for representing the tag field that list item is whether available in the list item data structure, the described order mainly unavailablely with list item is: be used to represent that whether available main value with list item tag field be set to represent main unavailable with list item;
Describedly make that standby list item is unavailable to be: the value that is used to represent the tag field that standby list item is whether available is set to represent that standby list item is unavailable.
Adopt the method for processing label binding provided by the invention, exist many LSP can arrive under the situation of purpose LSR, as main LSP, other LSP that can arrive purpose LSR that will be except that the LSP of current employing are as standby LSP with the LSP of current employing, and main LSP and standby LSP are associated.When the LSP of current employing interrupts, directly switch to standby LSP from main LSP, and need not notify upstream LSR to reclaim label binding earlier, after switching is finished again upstream LSR send out label binding new, so just reduced the treating capacity of LSR when handling label binding, the needed time when having shortened the processing label binding simultaneously.
Description of drawings
Fig. 1 is simple label switched path schematic diagram;
Fig. 2 is the process chart when receiving new label binding in the processing label binding method provided by the invention;
Fig. 3 is the process chart of LSR when LSP changes in the method for processing label binding provided by the invention.
Embodiment
Core concept of the present invention is: LSR receive from downstream LSR send for the label binding of specific FEC the time, if there has been the label forwarding list item of current employing for this FEC, then the label of going into of the label forwarding list item of new label binding of basis and current employing is created standby label forwarding list item, and the label forwarding list item of current employing and standby label forwarding list item associated, and then when needs switch LSP, directly replace the Label Forwarding Information Base project of current employing with standby label forwarding list item, can finish the switching of label switched path.
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with drawings and the specific embodiments.
In each LSR, a Label Forwarding Information Base is arranged, write down the corresponding relation between label, outgoing label and the outbound port of going into of this LSR in the table.LSR receives a packet that has label from the upstream, label with this packet is found corresponding outgoing label and outbound port as going into label in Label Forwarding Information Base, with outgoing label replace this packet go into label after, this packet is sent to downstream LSR from outbound port.
In the present invention, related for the LSP that realizes current employing and standby LSP need be set up main incidence relation with list item and standby list item in Label Forwarding Information Base.Active and standby each other list item has the identical label of going into, and a certain identical LSR on the LSP of the list item representative process downstream network, leads the LSP that represents current employing with list item, and standby list item is represented standby LSP.Main can have identical data structure with list item with standby list item, distinguish with a tag field, for example, use the tag field of list item and standby list item as the differentiation master with bit, when getting 0, this binary digit represents that corresponding list item is that the master uses list item, represents that when this binary digit gets 1 corresponding list item is standby list item.Main incidence relation with list item and standby list item refers to: in Label Forwarding Information Base, active and standby each other list item has the identical label of going into, and is together in series by means such as pointer or arrays.For example, in the list item data structure, pointer is set, the main standby list item of pointed with list item; If a plurality of standby list items are arranged, then main with one in the standby list item of pointed of list item, and the pointer in the standby list item points to other standby list items successively.Again for example, take the secondary index structure, in Label Forwarding Information Base, go into label a pointer is set for each, array of this pointed, each element of array is deposited the outgoing label and the outbound port of a list item.The array of Fen Peiing is actually and leads with list item one to one like this.
Please refer to Fig. 2, Fig. 2 is the handling process when LSR receives new label binding in the method for processing label binding provided by the invention, may further comprise the steps:
So-called free label binding refers on the route meaning, and the sender of this label binding is not next jumping of specifying FEC.For example, in Fig. 1, on the route meaning, for LSR4, the person of sending of L2 LSR2 is next jumping of specifying FEC, and the person of sending of L4 LSR3 specifies FEC next jumping on the route meaning.Therefore, L4 is free label binding and L2 is not, L2 can be called the activation label binding.
The said herein free label binding that judges whether correspondence, refer to and judge whether to exist such label binding: the specified FEC of this label binding and the current label binding that receives is identical, and the LSP of the LSP of this label representative and the current label binding representative that receives is through a certain identical LSR on the downstream network.
For example, in Fig. 1, if LSR4 receives L2 after receiving L4 earlier, so after receiving L2, will be earlier upstream LSR be LSR5 announcement label binding L5, and create the main of Label Forwarding Information Base according to the label binding of L2 and announcement upstream and use list item, judge the free label binding L4 of existence then, then execution in step 206.
Step 206 is set up standby list item according to free label and master with the label of going into of list item, and sets up main with list item and standby list item incidence relation, execution in step 210.
Step 207 judges whether to exist the main label forwarding list item of using, if exist, then execution in step 208, otherwise execution in step 210.
Step 208 according to free label binding and the main standby list item that label is created Label Forwarding Information Base of going into label forwarding list item, is used to represent standby LSP.
Step 209 is set up main with list item and standby list item incidence relation.
Step 210 finishes the handling process to the label binding of receiving.
Like this, the LSP of all free label representatives can be with the LSP association of current employing, and when the LSP of current employing broke down, LSR just can judge whether standby LSP rapidly, if having, then switched to standby LSP fast; If no, then upstream LSR initiate the label recovery process.
Please refer to Fig. 3, Fig. 3 is the handling process of LSR when LSP changes in the method for processing label binding provided by the invention, may further comprise the steps:
Said herein LSP comprises the LSP and the standby LSP of current employing.The interruption of LSP is normally caused by two kinds of reasons: a kind of is that downstream LSR initiates the label binding recovery process, a kind of be and downstream LSR between communication link break down.Both of these case all can cause interrupting through the LSP of this LSR and downstream LSR.This LSR can detect the interruption of LSP by coherent detection.
Whether step 302, the pairing Label Forwarding Information Base list item of LSP that judge to interrupt are mainly to use list item, if execution in step 303 then, otherwise execution in step 307.
As a kind of replacement scheme, can in the data structure of label forwarding list item, a tag field be set, be used to represent that this list item is available or dormancy.For example, with the bit field that serves as a mark, represent that when this binary digit is 1 this list item is available, and represent that when this binary digit is 0 this list item is dormancy.Like this, can change dormancy with the tag field in the list item into from available with main in this step, not delete and will not lead with list item.
Step 304 according to main incidence relation with list item, judges whether to exist and the main standby list item that is associated with list item, if standby list item is arranged, then execution in step 305, otherwise execution in step 306.
Step 305 activates standby list item, with the LSP of the standby list item representative LSP as current employing, finishes this handling process.
The standby list item of above-mentioned activation, refer to revise be used to distinguish in the list item list item be main still be the tag field of standby list item with list item, from representing that this list item is the value of standby list item, being modified as this list item of expression is main value with list item with this tag field.After standby list item was activated, then the content of putting down in writing according to this this list item was carried out label forwarding.
Step 306 thinks that the LSP of the current employing interrupted does not have standby LSP, and upstream LSR initiates the label binding recovery process, finishes this handling process.
As a kind of replacement scheme, can in the data structure of label forwarding list item, a tag field be set, be used to represent that this list item is available or dormancy.For example, be the available still tag field of dormancy with bit as distinguishing list item, represent that when this binary digit is 1 this list item is available, and represent that when this binary digit is 0 this list item is dormancy.Like this, can change the tag field in the standby list item of the LSP correspondence of interrupting into dormancy from available in this step, and not with the backing sheet entry deletion of the LSP correspondence of interrupting.
In handling process shown in Figure 3, step 303 and step 304 do not have strict sequencing requirement.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1, a kind of method of handling label binding is characterized in that, this method may further comprise the steps:
The label binding that A, judgement are received is to activate label binding or free label binding, if activate then execution in step B of label binding, otherwise execution in step C;
B, activate label binding according to this and mainly finish current handling process after with list item setting up in the Label Forwarding Information Base;
C, for there being main free label with list item, according to main going into label and should free label binding create standby list item with list item, if it is a plurality of that main standby list item with list item has, then should lead and be undertaken related by pointer or array with a plurality of standby list items of list item and this.
2, the method for processing label binding according to claim 1 is characterized in that, the label binding that described judgement is received is that activation label binding or free label binding are:
Judge whether the LSR LSR that sends this label binding is to specify forwarding equivalence class next jumping on the route meaning,, otherwise think that this label binding is free label binding if think that then this label binding is the activation label binding.
3, the method for processing label binding according to claim 1 is characterized in that, step B further comprises:
The label binding of LSR announcement upstream.
4, the method for processing label binding according to claim 1 is characterized in that, step B further comprises:
The corresponding free label binding of the activation label binding that judges whether and receive, if having then set up standby list item according to free label binding, and should standby list item related with main usefulness list item.
5, the method for processing label binding according to claim 1 is characterized in that, sets up the master described in the step B with list item to be: being provided for distinguishing list item in the list item data structure is main tag field with list item;
The method of creating standby list item described in the step C is: be provided for distinguishing the tag field that list item is standby list item in the list item data structure.
According to the method for claim 1 or 4 described processing label bindings, it is characterized in that 6, this method further is included in the list item data structure pointer is set;
In step C, be to be undertaken related with described a plurality of standby list items by pointer with list item described master, and method that should association comprises: order is main with one in the standby list item of pointed in the list item data structure, makes the backing sheet item number point to other standby list items successively according to the pointer in the structure.
According to the method for claim 1 or 4 described processing label bindings, it is characterized in that 7, this method further is included as each and goes into label and a pointer is set, array of this pointed;
In step C, be with described main undertaken by array with list item and described a plurality of standby list items related, the identical pointer array pointed of going into label that this array is had with list item and this a plurality of standby list item for this master.
8, the method for processing label binding according to claim 1 is characterized in that, when label switching path LSP changed, this method further may further comprise the steps:
D, what judge the LSP correspondence change is main with list item or standby list item, if main with list item execution in step E then, otherwise execution in step F;
E, order are main unavailable with list item, and judge whether to exist with main with the related standby list item of list item, if exist then activate standby list item and finish current handling process, otherwise behind the label binding of the LSR initiation upstream recovery process and finish current handling process;
F, make standby list item unavailable.
9, the method for processing label binding according to claim 8, it is characterized in that, being provided for distinguishing list item and being main in the list item data structure still is the tag field of standby list item with list item, the LSP correspondence that described judgement changes be that the master is with list item or standby list item:
Judge that according to the tag field in the pairing list item of the LSP that changes this list item is main with list item or standby list item.
10, the method for processing label binding according to claim 8 is characterized in that, the described order mainly unavailablely with list item is: should lead and delete from Label Forwarding Information Base with list item;
Describedly make that standby list item is unavailable to be: should from Label Forwarding Information Base, delete by standby list item.
11, the method for processing label binding according to claim 8, it is characterized in that, be provided for representing the tag field that list item is whether available in the list item data structure, the described order mainly unavailablely with list item is: be used to represent that whether available main value with list item tag field be set to represent main unavailable with list item;
Describedly make that standby list item is unavailable to be: the value that is used to represent the tag field that standby list item is whether available is set to represent that standby list item is unavailable.
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| CN103931147B (en) * | 2011-11-14 | 2017-05-24 | 英特尔公司 | Path diversity in a connection-oriented network |
| CN107547397B (en) * | 2017-05-19 | 2020-05-12 | 新华三技术有限公司 | Table entry management method and device |
| CN107547386B (en) * | 2017-06-23 | 2020-03-06 | 新华三技术有限公司 | Message forwarding method and device |
| CN110336745B (en) * | 2019-08-28 | 2019-12-20 | 广州市高科通信技术股份有限公司 | Method and device for realizing rapid convergence of service paths through batch operation |
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