CN101521623B - Tag distribution method, system and node device - Google Patents
Tag distribution method, system and node device Download PDFInfo
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- CN101521623B CN101521623B CN2008101008876A CN200810100887A CN101521623B CN 101521623 B CN101521623 B CN 101521623B CN 2008101008876 A CN2008101008876 A CN 2008101008876A CN 200810100887 A CN200810100887 A CN 200810100887A CN 101521623 B CN101521623 B CN 101521623B
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Abstract
The invention discloses a tag distribution method, a system and a node device, which belongs to the field of telecommunication. The method includes the following steps: an ingress node sends a tag distribution message which carries part of tag information and part of information about the tag distribution rules of an egress node; and the egress node receives the tag distribution message, and obtains part of tag information of the egress node and generates a downstream tag. The system comprises an ingress node device and an egress node device, wherein the ingress node device comprises a generating module and a sending module and the egress node device comprises a receiving module, a judging module and a processing module. An intermediate node comprises a first receiving module, a judging module, a transmitting module, a second receiving module and a processing module. As the signaling messages of two-way services carry part of tag information and the matched information of the tag information, the invention can flexibly control the sub-tag of the two-way tag values in the two-way services.
Description
Technical field
The present invention relates to communication field, particularly a kind of label distribution method, system and node device.
Background technology
PBB-TE (Provider Backbone Bridge-Traffic Engineering; Provider backbone bridging traffic engineering) is a kind of emerging bag tranmission techniques; This technology is through carrying out certain improvement to Ethernet bridge; The connection-oriented TE of having (Traffic Engineering, traffic engineering) can be provided the network of function; OAM (Operation, Administration, Maintenance, operation, management, maintenance) and defencive function through strengthening provides carrier-class other network simultaneously.
In PBB-TE, Ethernet bridge carries out data forwarding through label unique in the overall situation or the provider domain for foundation, and configuration is transmitted, and forms connection-oriented LSP (Label Switched Path, label switched path).Wherein, Label among the PBB-TE is by VID (Virtual Local Area Network Identifier; Virtual local area network identifiers) (12bits) and DMAC (Destination Media Access Control, purpose Media Access Control address) form unique label value in the overall situation or the provider domain.Simultaneously, in Ethernet,, can divide, make VID have the identification service kind VID from the angle of operator's O&M, or effect such as QoS of survice (Quality of Service, service quality) grade.For the two-way services in the network; Operator hopes according to the attribute of two-way services and classification; The VID that the both direction label uses in the control two-way services, thus satisfy the management and the demand for control of operator, hope that from the demand of the management maintenance of self VID label that the both direction of two-way services uses is must VID identical or that both direction uses identical as far as possible like: operator; Or the VID that both direction uses is necessary inequality, or the VID that both direction uses is inequality as far as possible.
At present; GMPLS (Generalized Multiprotocol Label Switching; The exchange of general multiple protocols label) signaling is supported the establishment of bidirectional LSP; Through Label Set (tally set) technology or Suggested Label (suggestion label) object technology of expansion, can the label that both direction in the two-way services constructive process uses be distributed and control simultaneously.
In realizing process of the present invention, the inventor finds that there is following shortcoming at least in above-mentioned prior art:
The function present according to Label Set; The label that carries is a universal tag; Can not represent the part (like VID) in certain label value, and at present the semanteme of Label Set is compulsory, if when promptly downstream node does not satisfy the labeling requirement among the Label Set; Then can report an error, can't satisfy VID that operator hopes that both direction the uses identical demand of trying one's best.
And can only carry a label value among the Suggested Label; And function according to present Suggested Label; After downstream node is received the Suggested Label object that carries in the Path message; Can dispose transmitting (or being called cross matrix) of downstream direction according to the label value that carries in this object; If but the distributed labels of downstream node in Resv message is different with Suggested Label, with adopt distributed labels in the Resv message as physical tags configuration transmit, therefore; If be to have enough information to accomplish function that configuration transmits according to incomplete label (VID) only, Suggested Label can not satisfy the requirement that requires VID consistent as far as possible within the specific limits among the PBB-TE.
Summary of the invention
In the two-way services constructive process of PPB-TE; Must be identical or in certain scope, try one's best identical or the demand inequality of must trying one's best inequality or within the specific limits in order to realize that label that both direction uses can satisfy, the embodiment of the invention provides a kind of label distribution method, system and node device.Said technical scheme is following:
On the one hand, a kind of label distribution method, said method comprises:
Ingress node sends label distribution message; Said label distribution message is carried subtab information and matched rule information; Wherein, Said subtab information is used for identifying the scope that said Ingress node is hoped the downstream label value subtab that Egress node distributes, in the subtab that the said Egress node of said matched rule message identification distributes to the matching degree of this scope;
Said Egress node receives said label distribution message, according to said subtab information and matched rule information, judges whether to accept said subtab information; If; Then generate the downstream label, and said downstream label is put into Resv message, upstream so is sent; Make the node of receiving said Resv message cross matrix, till Ingress node according to said downstream tag configurations downstream direction.
On the other hand, a kind of label distribution system, said system comprise inlet node device and Egress node equipment;
Said Ingress node equipment comprises:
Generation module; Be used to generate label distribution message; Said label distribution message is carried subtab information and matched rule information; Wherein, said subtab information is used for identifying the scope that said Ingress node is hoped the downstream label value subtab that Egress node distributes, in the subtab that the said Egress node of said matched rule message identification distributes to the matching degree of this scope;
Sending module is used to send the label distribution message that said generation module generates;
Said Egress node equipment comprises:
Receiver module is used to receive said label distribution message;
Judge module is used for according to said subtab information and matched rule information, judges whether to accept said subtab information;
Processing module; The result who is used for judging when said judge module is for being; Then generate the downstream label, and said downstream label is put into Resv message, upstream so is sent; Make the node of receiving said Resv message cross matrix, till Ingress node according to said downstream tag configurations downstream direction.
The beneficial effect of the technical scheme that the embodiment of the invention provides is:
In the signaling of creating two-way services; Through carrying subtab information and matched rule information; Having realized that label that the both direction of two-way services uses satisfies must be identical or try one's best identical or must be different or different demands as far as possible, thereby realization is for the flexible control of subtab in the both direction label value in the two-way services.
Description of drawings
Fig. 1 is the definition sketch map of the subtab that provides of the embodiment of the invention;
Fig. 2 is the two-way video business that is directed against that the embodiment of the invention 1 provides, when matched rule is necessary identical, through the label distribution method flow chart of Path message realization;
Fig. 3 is the two-way video business that is directed against that the embodiment of the invention 1 provides, the Path interacting message sketch map when matched rule is necessary identical;
Fig. 4 is the two-way video business that is directed against that the embodiment of the invention 2 provides, when matched rule is necessary identical, through the label distribution method flow chart of Path message realization;
Fig. 5 is the two-way video business that is directed against that the embodiment of the invention 2 provides, the Path interacting message sketch map when matched rule is necessary identical;
Fig. 6 be the embodiment of the invention 3 provide professional to two-way video, matched rule is for trying one's best when identical, through the label distribution method flow chart of Path message;
Fig. 7 be the embodiment of the invention 3 provide professional to two-way video, matched rule is Path interacting message sketch map when identical of trying one's best;
What Fig. 8 was that the embodiment of the invention 4 provides is that speech business and down direction are video traffic to up direction, and matched rule be necessary when identical, through the label distribution method flow chart of Path message;
What Fig. 9 was that the embodiment of the invention 4 provides is that speech business and down direction are video traffic to up direction, and matched rule be necessary Path interacting message sketch map when identical;
Figure 10 is the two-way video business that is directed against that the embodiment of the invention 5 provides, when matched rule is necessary identical, through the label distribution method flow chart of Call message realization;
Figure 11 is the two-way video business that is directed against that the embodiment of the invention 5 provides, the Call interacting message sketch map when matched rule is necessary identical;
Figure 12 be the embodiment of the invention 6 provide professional to two-way video, matched rule is for trying one's best when identical, through the label distribution method flow chart of Call message realization;
Figure 13 be the embodiment of the invention 6 provide professional to two-way video, matched rule is Call interacting message sketch map when identical of trying one's best;
Figure 14 is the label distribution system schematic that the embodiment of the invention 7 provides;
Figure 15 is the label distribution system schematic that the embodiment of the invention 8 provides;
Figure 16 is the sketch map of the Ingress node equipment that provides of the embodiment of the invention 9;
Figure 17 is the sketch map of the Egress node equipment that provides of the embodiment of the invention 10.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.
In the two-way services constructive process of PPB-TE; Must be identical or trying one's best identical or must the inequality or demand inequality of trying one's best in order to realize that label that both direction uses can satisfy; The embodiment of the invention is introduced subtab (SubLabel) definition, and this subtab is used for representing the part (like the VID in the label value that uses among the PBB-TE) of a label value; Simultaneously in the signaling procedure that two-way services are created; Use subtab object (SubLabel Object); This subtab object is used for carrying the scope that upstream node is hoped downstream node distributed labels value subtab; And the strategy (must be identical or try one's best identical or must be different or difference as far as possible) that requires coupling, thereby realized how downstream node is carried out the constraint and the control of label distribution, satisfied the management demand for control of operator.
Referring to Fig. 1, the definition sketch map of the subtab that provides for the embodiment of the invention.Wherein, each Field Definition is following:
Range (8bits): the value of enumerating (being particularize) of the subtab value representation of representing to carry in this subtab object or a scope of representing.For example: 1 this object of expression carries subtab through the mode of enumerating value; The value that 2 these objects of expression carry subtab through the interval mode of sign subtab can be represented a plurality of intervals.
Match Rule (8bits): matched rule, expression signaling initiator hopes the matched rule for the subtab that carries in this subtab object, for example the rule of definition and value are as follows:
1 expression must be identical; 2 expressions are identical as far as possible; 3 expressions must be different; 4 expressions are different as far as possible.
Reserved (8bits): reserved field.
SubLabel Type (8bits): the subtab type, represent the subtab type and the form that carry in this object, wherein, the type of subtab is relevant with concrete tranmission techniques with form.
SubLabel (variable length): the label value that carries in the expression subtab, wherein, length is relevant with tag types.The concrete label value that subtab 1～subtab N representes is relevant with Range object value.If Range is 1, subtab 1～subtab N representes the value of subtab in this object that particularize goes out; If Range is 2, the scope of the subtab value of representing to carry in this object, the number that this moment, subtab occurred is necessary for the even number more than or equal to 2.For example, carry subtab 1=2 during Range=2, subtab 2=5 representes that the subtab scope that this subtab carries is 2～5; If carry subtab 1=2, subtab 2=5, subtab 3=8, subtab 4=12 representes that the subtab scope that this subtab carries is 2～5 and 8～12.
Method in that embodiments of the invention provide comprises: Ingress node sends label distribution message, and label distribution message is carried part label information and Egress node part label distribution Rule Information; Egress node receives label distribution message, obtains the part label information of Egress node according to part label information and Egress node part label distribution Rule Information, and generates the downstream label.The method that provides to the embodiment of the invention; Below respectively to carry out detailed explanation among a plurality of embodiment; When describing; With the PBB-TE network is example, and the label among the PBB-TE is made up of VID+DMAC, supposes that operator has carried out following division to the VID resource of distributing to PBB-TE: the video traffic that VID1, VID2 is allocated to high bandwidth, low time delay; VID3, VID4 are allocated to the file transfer service not high to delay requirement; VID5, VID6 are allocated to the speech business of the low time delay of low bandwidth; VID7 is distributed to the business of high priority; VID8 is distributed to the business of low priority; VID9 is not special to be specified.And the embodiment of the invention describes with the example that is established as that adopts the RSVP-TE implementing signalling two-way services among the GMPLS, but is not limited in the signaling of RSVP-TE, also can adopt other to set up implementing signalling.
It is that the two-way services of video traffic are example through at least 3 nodes and type of service that present embodiment is created one with needs; And require the professional both direction of this two-way video must use identical VID; The embodiment of the invention has realized that the VID that the professional both direction of two-way video uses satisfies necessary identical demand, referring to Fig. 2 through in Path message, carrying subtab; The embodiment of the invention provides a kind of label distribution method, and this method thes contents are as follows:
Step 101: Ingress node is provided with subtab information and matched rule information according to the VID value of the upper tag of confirming.
In the present embodiment; In view of the type of service of creating is a video traffic; And in operator during to the division of the VID resource of distributing to PBB-TE; Wherein VID1, VID2 are allocated to the video traffic of high bandwidth, low time delay, and it is that example describes as the VID value representation video traffic of upper tag that present embodiment is therefrom selected VID1 with Ingress node.So Ingress node selects VID1 as the VID value in the upper tag, and the VID value in the subtab is changed to VID1, the matched rule of setting subtab is must be identical, and promptly requiring Egress node part label distribution rule is also will the VID value be changed to VID1.
Step 102: Ingress node sends Path message to next node, carries upper tag and subtab object information in this Path message, and wherein, the subtab object information specifically comprises: subtab information and matched rule information.
Wherein, carry in the upper tag that to represent type of service be self DMAC information (Ingress DMAC) information of VID=1 information and the Ingress node of video; Carry subtab information (VID=1) and matched rule information (must be identical) in the subtab object information.
Step 103: after next node receives Path message, whether judge the VID that requires in the subtab in the receptible scope of this node, if, transmit the Path message of receiving, otherwise, report an error.
Wherein, judge that at node the VID that requires in the subtab whether in the receptible scope of this node, judges promptly whether this node can be changed to VID1 with the VID value.
In like manner, each node on this path is carried out this judgement successively, till Path message passes to Egress node (Egress).
Step 104: after Egress node is received Path message, judge and self whether can distribute VID1 as the downstream label, if, execution in step 105; Otherwise, execution in step 107.
Step 105: Egress node returns Resv message to its upper reaches, and the DMAC that carries by VID1 and Egress node in this Resv message forms the downstream label,
Step 106: after upstream node is received Resv message, according to the cross matrix of the downstream label information configuration of carrying in this Resv message self;
In like manner, till Ingress node is received Resv message, thereby accomplished the configuration of the cross matrix of each node in this path, finished.
Step 107: Egress node returns PathErr message to its upper reaches; Upstream node is transmitted PathErr message successively; Till Ingress node was received the PathErr message from Egress node, this PathErr message table illustrated mouthful node and can not distribute VID1 as the downstream label, finished.
Referring to Fig. 3; The information interaction sketch map that provides for the embodiment of the invention; There to be an intermediate node (Inter) between Ingress node and the Egress node is that example describes, and the process of setting up this LSP is: after Ingress node is received this video traffic request, distribute upper tag; Select VID1 as the VID value in the upper tag and according to customer requirements (VID in the label of downstream must be identical with the VID value in the upper tag) among the VID from the expression video traffic; In the subtab object, the VID value in the subtab is changed to VID1, the matched rule of setting this subtab simultaneously is for necessary identical.Above-mentioned object is put into Path message and is sent to intermediate node, and this intermediate node is judged the VID that requires in the subtab in the receptible scope of this node, and promptly this node can be changed to VID1 with the VID value; Then, this intermediate node is transmitted Path message to Egress node; When Egress node judges that this node can distribute VID1 as the downstream label (VID1 can accept); VID1 and the DMAC of self are formed the downstream label; Put into Resv message; Upstream so transmits, and receives the cross matrix of the node of Resv message according to downstream tag configurations downstream direction, up to Ingress node; When the Egress node judgement self can not distribute VID1 as the downstream label (VID1 is unacceptable), then produce PathErr message and pass the upstream so node, up to Ingress node.
The embodiment of the invention has realized that the label that the professional both direction of two-way video uses satisfies necessary identical demand, thereby has realized the flexible control for subtab in the both direction label value in the two-way services through in Path message, carrying subtab.
It is that the two-way services of video traffic are example through at least 3 nodes and type of service that present embodiment is still created one with needs; With embodiment 1 different being, when setting up this two-way video business, the VID that requires Ingress node and Egress node to use can be different; But must be in representing the VID scope of video traffic; The embodiment of the invention has realized that the label that the professional both direction of two-way video uses satisfies necessary identical demand, referring to Fig. 4 through in Path message, carrying subtab; The embodiment of the invention provides a kind of label distribution method, and this method thes contents are as follows:
Step 201: Ingress node selects VID1 as the VID value in the upper tag; VID value in the subtab is changed to VID1; VID2, the matched rule of setting subtab are must be identical, and promptly the label distribution rule of Egress node is also will the VID value be changed to VID1 or VID2.
Step 202: Ingress node sends Path message to next node, carries upper tag and subtab object information in this Path message.
Wherein, upper tag comprises the Ingress DMAC of VID value and Ingress node; The subtab object information specifically comprises: subtab information and matched rule information.
Step 203: after next node is received Path message, judge the VID that requires in the subtab whether in the receptible scope of this node, promptly whether this node can be changed to VID1 or VID2 with the VID value; If; Transmit Path message to its next node, otherwise, report an error.
Wherein, when its next node sends Path message, carry upper tag and subtab object information in this Path message.
In like manner, each node on this path continues this judgement, passes to Egress node (Egress) up to Path message.
Step 204: after Egress node is received Path message, judge and self whether can distribute VID1 or VID2 as the downstream label, if, execution in step 205; Otherwise, execution in step 207.
Step 205: judge this node when Egress node and can not distribute VID1 as the downstream label but can distribute VID2 as the downstream label, then VID2 and Egress DMAC are formed the downstream label, put into Resv message, upstream so transmits.
The embodiment of the invention can not distribute VID1 as the downstream label but to distribute VID2 be that example describes as the downstream label with Egress node.If can distribute VID1 as the downstream label when Egress node, also can distribute VID2 as the downstream label, then can be according to self configuration of node, one of therefrom arbitrary selection is as the downstream label.
Step 206: after upstream node is received Resv message, according to the cross matrix of the downstream label information configuration of carrying in this Resv message self;
In like manner, till Ingress node is received Resv message, thereby accomplished the configuration of each node in this path.
Step 207: Egress node produces PathErr message and passes the upstream so node.
Wherein, because Egress node can not distribute VID1 as the downstream label, can not distribute VID2 as downstream label (be VID1, VID2 can not accept) again, then Egress node produces PathErr message and passes the upstream so node.
Referring to Fig. 5, for the information interaction sketch map that the embodiment of the invention provides, be that example describes there to be an intermediate node (Inter) between Ingress node and the Egress node, the process of setting up this LSP is:
After Ingress node is received this video traffic request, distribute upper tag, select VID1 among the VID from video traffic as the VID value in the upper tag; Can be different according to the VID in the label of customer requirements downstream with the VID value in the upper tag; But must in being allocated to the VID scope of video traffic, select, therefore in the subtab object, the VID value in the subtab is changed to VID1; VID2, the matching strategy of setting this subtab simultaneously is for necessary identical.Above-mentioned object is put into Path message be sent to intermediate node, intermediate node is judged the VID that requires in the subtab whether in the receptible scope of this node, and promptly whether this node can be changed to VID1 or VID2 with the VID value; If can accept, transmit Path message to Egress node, otherwise report an error; Can not distribute VID1 as the downstream label this moment if Egress node is judged this node; But can distribute VID2 as the downstream label, VID2 and the DMAC of self are formed the downstream label, put into Resv message; Upstream so transmits, and receives the cross matrix of the node of Resv message according to downstream tag configurations downstream direction.If Egress node is judged this node to VID1, VID2 can not accept, and promptly Egress node neither distributes VID1 as the downstream label, can not distribute VID2 as the downstream label again, then produces PathErr message and passes the upstream so node.
The embodiment of the invention has realized that the label that the professional both direction of two-way video uses satisfies necessary identical demand, thereby has realized the flexible control for subtab in the both direction label value in the two-way services through in Path message, carrying subtab.
Embodiment 3
It is that the two-way services of video traffic are example through at least 3 nodes and type of service that present embodiment is still created one with needs; The professional business of both direction that allows of two-way video adopts different VID; But the VID that the business that will as far as possible guarantee both direction is used selects in distributing to the professional VID of two-way video; The embodiment of the invention has realized that the label that the professional both direction of two-way video uses satisfies the identical demand of trying one's best, referring to Fig. 6 through in Path message, carrying subtab; The embodiment of the invention provides a kind of label distribution method, and this method thes contents are as follows:
Step 301: Ingress node selects VID1 as the VID value in the upper tag; VID value in the subtab is changed to VID1; VID2; The matched rule of setting subtab is identical for as far as possible, and promptly Egress node part label distribution rule is to select and VID1, and the VID that the type of service that VID2 representes (being video traffic) is mated as far as possible is as label.
Step 302: Ingress node sends Path message to next node, carries upper tag and subtab object information in this Path message, and wherein, the subtab object information specifically comprises: subtab information and matched rule information.
Step 303: after next node is received Path message, judge the VID that requires in the subtab whether in the receptible scope of this node, promptly whether this node can be changed to VID1 or VID2 with the VID value; If; Send Path message to its next node, otherwise, report an error.
Wherein, when its next node sends Path message, carry upper tag and subtab object information in this Path message.
In like manner, each node on this path continues this judgement, passes to Egress node (Egress) up to Path message.
Step 304: after Egress node is received Path message, judge that the result according to judging correspondingly carries out following each step to self distributing VID as the downstream label:
Step 305: when in step 304; Egress node is judged and can not be distributed VID1 as the downstream label but can distribute VID2 as the downstream label time; VID2 and Egress node DMAC are formed the downstream label, put into Resv message upstream so and transmit, receive the cross matrix of the node of Resv message according to downstream tag configurations downstream direction; Up to Ingress node, finish.
Wherein, in like manner, Egress node is judged and can not be distributed VID2 as the downstream label but can distribute VID1, and VID1 and Egress node DMAC are formed the downstream label, puts into Resv message upstream so and transmits.
Step 306: when in step 304, Egress node is judged VID1, and VID2 can not accept; But VID7 can accept, and promptly this node can not distribute VID1 as the downstream label, can not distribute VID2 as the downstream label again; But in the time of distributing VID7 as the downstream label, VID7 and Egress node DMAC are formed the downstream label, put into Resv message upstream so and transmit; Receive the cross matrix of the node of Resv message,, finish up to Ingress node according to downstream tag configurations downstream direction.
Wherein, Because the matched rule of Ingress node is identical as far as possible, owing to supposed that operator has carried out the business that following division: VID7 is allocated to high priority, VID1 to the VID resource of distributing to PBB-TE; VID2 is allocated to the video traffic of high bandwidth, low time delay; It is identical as far as possible that VID7 and VID1, VID2 belong to, so can distribute VID7 as the downstream label.
Referring to Fig. 7, for the information interaction sketch map that the embodiment of the invention provides, be that example describes there to be an intermediate node between Ingress node and the Egress node, the process of setting up this LSP is:
After Ingress node is received this video traffic request, distribute upper tag, select VID1 among the VID from video traffic as the VID value in the upper tag; Can be different according to the VID in the label of customer requirements downstream with the VID value in the upper tag; But select in the VID scope that is allocated to video traffic as far as possible, therefore in the subtab object, the VID value in the subtab is changed to VID1; VID2, the matching strategy of setting this subtab simultaneously is identical for as far as possible.Above-mentioned object is put into Path message and is sent to intermediate node, and intermediate node is judged the VID that requires in the subtab in the receptible scope of this node, transmits Path message to Egress node; Judging this node when Egress node can not distribute VID1 as the downstream label this moment; But can distribute VID2 as the downstream label, VID2 and Egress DMAC are formed the downstream label, put into Resv message; Upstream so transmits, and receives the cross matrix of the node of Resv message according to downstream tag configurations downstream direction.Judge VID1 when Egress node, VID2 can not accept, and promptly this node can not distribute VID1 as the downstream label; Can not distribute VID2 as the downstream label again; According to the identical match principle of trying one's best, select and VID1, the VID that the type of service of 2 expressions is mated as far as possible is as label (this matching relationship can be controlled through strategy); Select VID7; Carry the label be made up of VID7 and Egress node DMAC in the Resv message as the downstream label, upstream so transmits, and receives the cross matrix of the node of Resv message according to downstream tag configurations downstream direction.
The embodiment of the invention has realized that the label that the professional both direction of two-way video uses satisfies the identical demand of trying one's best, thereby has realized the flexible control for subtab in the both direction label value in the two-way services through in Path message, carrying subtab.
Embodiment 4
Aforementioned each embodiment is that need to set up two-way services with the user all be that video is the explanation that example is carried out; In the two-way services of present embodiment with user's foundation, up (Upstream) direction (promptly from the Ingress node to the Egress node) is speech business, and descending (Downstream) direction (promptly from the Egress node to the Ingress node) is that example describes for video traffic; And the professional VID of customer requirements both direction distributes; Must strict restriction carry out according to the VID under professional, promptly matched rule is must be identical, referring to Fig. 8; The embodiment of the invention provides a kind of label distribution method, specifically comprises:
Step 401: Ingress node selects VID5 as the VID value in the upper tag; VID value in the subtab is changed to VID1; VID2, the matching strategy of setting subtab are must be identical, and promptly Egress node part label distribution rule is will the VID value be changed to VID1 or VID2.
Wherein, The business of the up direction in these two-way services is speech business; And when in operator the VID resource of distributing to PBB-TE being divided, VID5 is allocated to the speech business that low bandwidth is hanged down time delay, so Ingress node selects VID5 as the VID value in the upper tag.
Step 402: Ingress node sends Path message to next node, carries upper tag and subtab object information in this Path message, and wherein, the subtab object information specifically comprises: subtab information and matched rule information.
Step 403: after next node is received Path message, judge the VID that requires in the subtab whether in the receptible scope of this node, promptly whether this node can be changed to VID1 or VID2 with the VID value, if can, subtab is passed toward next node, otherwise, report an error.
In like manner, each node in downstream continues this judgement, passes to Egress node up to Path message.
Step 404: after Egress node is received Path message, judge that the result according to judging correspondingly carries out following each step to self distributing VID as the downstream label:
Step 405: when the result who in step 404, judges is that this node can not distribute VID1 as the downstream label but can distribute VID2 as the downstream label time; VID2 and Egress node DMAC are formed the downstream label; Put into Resv message, upstream so transmits, and receives the cross matrix of the node of Resv message according to downstream tag configurations downstream direction; Up to Ingress node, finish.
Step 406: when the result who in step 404, judges is this node VID1, VID2 can not accept, and promptly this node can not distribute VID1 as the downstream label; Can not distribute VID2 as the downstream label again; Then produce PathErr message and pass the upstream so node,, finish up to Ingress node.
Referring to Fig. 9, for the information interaction sketch map that the embodiment of the invention provides, be that example describes there to be an intermediate node (Inter) between Ingress node and the Egress node, the process of setting up this LSP is:
Ingress node is made as VID5 (speech business) with the VID of upper tag; Be video traffic owing to downstream traffic simultaneously, the VID space that the while customer requirements must use video traffic, promptly the VID in the label of downstream must select in being allocated to the VID scope of video traffic; Therefore in the subtab object; VID value in the subtab is changed to VID1, VID2, the matching strategy of setting this subtab simultaneously is for necessary identical; Above-mentioned object is put into Path message, and to be sent to next node be intermediate node; Intermediate node judges that the VID that requires in the subtab is whether in the receptible scope of this node; Be whether this node can be changed to VID1 or VID2 with the VID value,, subtab passed toward next node if can accept; Otherwise report an error, pass to Egress node up to Path message; When Egress node judges that this node can not distribute VID1 as the downstream label; But can distribute VID2 as the downstream label; VID2 and Egress node DMAC are formed the downstream label, put into Resv message, upstream so transmits; Receive the cross matrix of the node of Resv message, till Ingress node according to downstream tag configurations downstream direction; Judge VID1 when Egress node, VID2 can not accept, and promptly this node can not distribute VID1 as the downstream label, can not distribute VID2 as the downstream label again, then produces PathErr message and passes the upstream so node.
Certainly the user as required also can be through being provided with tag match item in the subtab object for must be identical or must be inequality or try one's best inequality to satisfy the demand that the user controls the part label (VID) in the two-way services flexibly.
The embodiment of the invention is in the signaling of creating two-way services; A part of carrying in the label value through Path message is the control information of subtab; This message identification Ingress node hope the scope of subtab in the downstream label value that Egress node distributes, in the subtab that Egress node distributes to the matching degree of this scope.Thereby realize flexible control for subtab in the both direction label value in the two-way services.
Each embodiment that provides in sum is when setting up two-way services, through in Path message, carrying the subtab object information, thereby realizes the flexible control for subtab in the both direction label value in the two-way services.Wherein, for the control of VID value in the two-way services, also can accomplish through calling out (Call) function in the signaling.See following each embodiment for details:
Embodiment 5
The embodiment of the invention is created the two-way services through at least 3 nodes with needs; This business is that two-way video transmits; This two-way services both direction of customer requirements must use identical VID to describe as example; Referring to Figure 10, the embodiment of the invention provides a kind of label distribution method, specifically comprises:
Step 501: Ingress node with the VID value in the subtab be changed to upper tag in the VID value identical, i.e. VID1, the matched rule of setting subtab be necessary identical, promptly Egress node part label distribution rule is also will the VID value be changed to VID1.
Step 502: Ingress node sends Call message to Egress node, wherein, carries subtab information VID1 and matched rule information (must be identical) in the Call message.
Step 503: after Egress node was received Call message, judging whether to distribute VID1 was the downstream label, if can, then execution in step 504; Otherwise, execution in step 508.
Step 504: Egress node returns CallAck message to Ingress node, wherein, carries Selected subtab (VID1) in the CallAck message, representes that this Egress node can distribute VID1 as the downstream label.
Step 505: after Ingress node is received CallAck message, send Path message downstream, do not carry the subtab object in the Path message to next node.
Step 506: downstream node is received the Path message from Ingress node, with this Path forwards up to Egress node.
Step 507: the VID value that Egress node selects Call to consult, promptly VID1 puts into Resv message as the VID value in the label of downstream, and upstream so transmits, and receives the cross matrix of the node of Resv message according to downstream tag configurations downstream direction, finishes.
Step 508: Egress node returns CallNAck message to Ingress node, wherein carries SubLabelUnavailable in the CallNAck message, representes that this Egress node can not distribute VID1 as the downstream label.
Step 509: after Ingress node is received CallNAck message, do not carry out follow-up connection and create, finish.
Referring to Figure 11, for the information interaction sketch map that the embodiment of the invention provides, be that example describes there to be an intermediate node (Inter) between Ingress node and the Egress node, the process of setting up this LSP is:
Before initiating Path message, Ingress node through Call announcement Egress node (Ingress node has known that VID is VID1 in the upper tag), carries the subtab object earlier among the Call: indicating must be identical with the VID:VID1 of the distribution that enters the mouth among the VID that Egress node distributes.After Egress node is received this Call message, if judge that it is the downstream label of this LSP that Egress node can distribute VID1, then return CallAck, SeclectedSubLabel value wherein can be distributed the subtab of VID1 as upper tag for VID1 shows Egress node.In the process that follow-up transmission Path message connects, need not carry the subtab object in the Path message, after Path message was sent to Egress node, the VID value that Egress node selects Call to consult: VID1 was as the VID value in the label of downstream.After Egress node is received the Call (referring to carry the Call of subtab) of the above-mentioned SubObject of carrying; Can not distribute VID1 as the downstream label if judge Egress node; Then return CallNAck message to Ingress node; Wherein carry no available subtab information (SubLabelUnavailable), the expression Egress node can not be according to the distributing labels that requires of Ingress node.After Ingress node receives this message, know current call failure, can not carry out follow-up connection and create.
The embodiment of the invention is in the signaling of creating two-way services; A part of carrying in the label value through Call message is the control information of subtab; This message identification Ingress node hope the scope of subtab in the downstream label value that Egress node distributes, in the subtab that Egress node distributes to the matching degree of this scope.Thereby realize flexible control for subtab in the both direction label value in the two-way services.
Embodiment 6
The embodiment of the invention is created the two-way services through at least 3 nodes with needs; This business is that two-way video transmits; VID in the downstream label that the customer requirements Ingress node distributes should be all example mutually with VID in the upper tag as far as possible and describe; Referring to Figure 12, the embodiment of the invention provides a kind of label distribution method, specifically comprises:
Step 601: Ingress node is changed to VID1 with the VID value in the subtab, VID2, the matching strategy of setting subtab is identical for as far as possible, promptly Egress node part label distribution rule be the VID that distributes try one's best and Call in carry VID (VID1, VID2) identical.
Step 602: Ingress node sends Call message to Egress node, and wherein, (VID1 is VID2) with matched rule information (identical as far as possible) to carry subtab information in the Call message.
Step 603: it is the downstream label that Egress node judges whether to distribute VID1, if then execution in step 604; Otherwise execution in step 608.
Step 604: Egress node returns CallAck to Ingress node, and wherein, the VID value among the SelectedSubLabel that CallAck carries is VID1.
Step 605: after Ingress node transmits and receives CallAck, send Path message, do not carry subtab in the Path message to next node.
Step 606: downstream node is received the Path message from Ingress node, transmits Path message up to Egress node.
Step 607: the VID value that Egress node selects Call to consult; Be that VID1 puts into Resv message as the VID value in the label of downstream, upstream so transmits, and receives the cross matrix of the node of Resv message according to downstream tag configurations downstream direction; Up to Ingress node, finish.
Step 608: it is the downstream label that Egress node judges whether to distribute VID2, if then execution in step 609; Otherwise, execution in step 613.
Step 609: Egress node returns CallAck to Ingress node, and wherein the VID value among the SelectedSubLabel that carries of CallAck is VID2.
Step 610: after Ingress node is received CallAck, send Path message, do not carry subtab in the Path message to next node.
Step 611: downstream node continues to transmit Path message up to Egress node.
Step 612: the VID value that Egress node selects Call to consult; Be that VID2 puts into Resv message as the VID value in the label of downstream, upstream so transmits, and receives the cross matrix of the node of Resv message according to downstream tag configurations downstream direction; Up to Ingress node, finish.
Step 613: Egress node returns CallAck to Ingress node, and wherein the VID value among the SelectedSubLabel that carries of CallAck is VID7.
Wherein, if Egress node can distribute VID7, because matched rule is identical for as far as possible, and because VID7 belongs to identical as far as possible with VID1 that represents video traffic and VID2, so Egress node is selected VID7.
Step 614: after Ingress node is received CallAck, transmit Path message, do not carry subtab in the Path message to next node.
Step 615: downstream node continues to transmit Path message up to Egress node.
Step 616: the VID value that Egress node selects Call to consult; Be that VID7 puts into Resv message as the VID value in the label of downstream, upstream so transmits, and receives the cross matrix of the node of Resv message according to downstream tag configurations downstream direction; Up to Ingress node, finish.
Referring to Figure 13, for the information interaction sketch map that the embodiment of the invention provides, be that example describes there to be an intermediate node (Inter) between Ingress node and the Egress node, the process of setting up this LSP is:
Before initiating Path message, the Ingress node is earlier through carrying the subtab object among the Call announcement Egress node Call: indicate among the VID that the Egress node distributes as far as possible and the VID that carries among the Call (VID1, VID2) identical.After the Egress node is received this Call message; If judge that it is the downstream label of this LSP that Egress can distribute VID1; Then return CallAck, SeclectedSubLabel value wherein can be distributed the subtab of VID1 as upper tag for VID1 shows the Egress node.If VID1 is unavailable, VID2 can use, and in CallAck message, will carry VID2 and return to Ingress, if VID1, VID2 is unavailable, according to the matching principle of trying one's best, selects the subtab of VID7 as the downstream label.In the process that follow-up transmission Path message connects, need not carry the subtab object in the Path message, after Path message was sent to the Egress node, the VID value that Egress node selection Call consults was as the VID value in the label of downstream.
The embodiment of the invention is in the signaling of creating two-way services; A part of carrying in the label value through Call message is the control information of subtab; This message identification Ingress node hope the scope of subtab in the downstream label value that Egress node distributes, in the subtab that Egress node distributes to the matching degree of this scope.Thereby realize flexible control for subtab in the both direction label value in the two-way services.
Referring to Figure 14, the embodiment of the invention provides a kind of label distribution system, and system comprises inlet node device and Egress node equipment;
Ingress node equipment is used to send label distribution message, and label distribution message is carried part label information and Egress node part label distribution rule message;
Egress node equipment is used to receive label distribution message, according to part label information and Egress node part label distribution Rule Information, judges whether Egress node can obtain the part label information, if then generate and send the downstream label.
Wherein, Ingress node equipment comprises:
Generation module is used to generate label distribution message, and label distribution message is carried part label information and Egress node part label distribution Rule Information;
Sending module is used to send the label distribution message that generation module generates.
Wherein, Egress node equipment comprises:
Receiver module is used to receive label distribution message;
Judge module is used for judging whether to obtain the part label information according to part label information and Egress node part label distribution Rule Information;
Processing module, be used for when the result who judge for being to generate and send the downstream label.
The label distribution system that the embodiment of the invention provides; In the signaling of creating two-way services; Part through carrying in the label value is the control information of subtab (SubLabel); This message identification Ingress node (Ingress) hope the scope of subtab in the downstream label value that Egress node (Egress) distributes, in the subtab that Egress node distributes to the matching degree of this scope.Thereby realize flexible control for subtab in the both direction label value in the two-way services.
Embodiment 8
Referring to Figure 15, the embodiment of the invention provides a kind of label distribution system, and system comprises the inlet node device, intermediary device and Egress node equipment; And intermediary device is between Ingress node equipment and Egress node equipment; The number of intermediary device at least one;
Ingress node equipment is used to send label distribution message, and label distribution message is carried part label information and Egress node part label distribution rule message;
Egress node equipment is used to receive label distribution message, according to part label information and Egress node part label distribution Rule Information, judges whether Egress node can obtain the part label information, if then generate and send the downstream label.
Intermediary device; Be used to receive the label distribution message that the inlet node device sends,, judge whether the label that carries in the ability receiving unit label information according to part label information and Egress node part label distribution rule; If, forwarding label assignment messages then; Also be used for after Egress node equipment generates the downstream label, receiving the downstream label, transmit configuration, and transmit the downstream label according to the downstream label.
Correspondingly, wherein Ingress node equipment comprises:
Generation module is used to generate label distribution message, and label distribution message is carried part label information and Egress node part label distribution Rule Information;
Sending module is used to send the label distribution message that generation module generates.
Wherein, Egress node equipment comprises:
Receiver module is used to receive label distribution message;
Judge module is used for judging whether to obtain the part label information according to part label information and Egress node part label distribution Rule Information;
Processing module, be used for when the result who judge for being to generate and send the downstream label.
Intermediary device comprises:
First receiver module is used to receive the label distribution message that the inlet node device sends;
Judge module, the part label information that the label distribution message that is used for receiving according to receiver module is carried and Egress node part label distribution rule judges whether to accept the label that carries in the part label information;
Forwarding module, the result who is used for judging when judge module is for being, then the forwarding label assignment messages;
Second receiver module is used for after Egress node generates the downstream label, receiving the downstream label;
Processing module is used for the downstream label that receives according to second receiver module, transmits configuration; And transmission downstream label.
The label distribution system that the embodiment of the invention provides; In the signaling of creating two-way services; Part through carrying in the label value is the control information of subtab (SubLabel); This message identification Ingress node (Ingress) hope the scope of subtab in the downstream label value that Egress node (Egress) distributes, in the subtab that Egress node distributes to the matching degree of this scope.Thereby realize flexible control for subtab in the both direction label value in the two-way services.
Embodiment 9
Referring to Figure 16, the embodiment of the invention provides a kind of Ingress node equipment, comprising:
Generation module is used to generate label distribution message, and label distribution message is carried part label information and Egress node part label distribution Rule Information;
Sending module is used to send the label distribution message that generation module generates.
Embodiment 10
Referring to Figure 17, the embodiment of the invention provides a kind of Egress node equipment, comprising:
Receiver module is used to receive label distribution message;
Judge module is used for judging whether to obtain the part label information according to part label information and Egress node part label distribution Rule Information;
Processing module, be used for when the result who judge for being to generate and send the downstream label.
Embodiment 11
Referring to Figure 18, the embodiment of the invention provides a kind of intermediary device, and intermediary device comprises:
First receiver module is used to receive the label distribution message that the inlet node device sends;
Judge module, part label information that the label distribution message that is used for receiving according to receiver module is carried and Egress node part label distribution Rule Information judge whether to accept the label that carries in the part label information;
Forwarding module, the result who is used for judging when judge module is for being, then the forwarding label assignment messages;
Second receiver module is used for after Egress node generates the downstream label, receiving the downstream label;
Processing module is used for the downstream label that receives according to second receiver module, transmits configuration; And transmission downstream label.
In sum; The technical scheme that the embodiment of the invention provides; In the signaling of creating two-way services; Part through carrying in the label value is the control information of subtab (SubLabel), this message identification Ingress node (Ingress) hope the scope of subtab in the downstream label value that Egress node (Egress) distributes, in the subtab that Egress node distributes to the matching degree of this scope.Thereby realize flexible control for subtab in the both direction label value in the two-way services.
Wherein, Sublabel object in the embodiment of the invention has just been explained a kind of mode of representing a kind of optimum of part label information and matched rule information thereof; Those skilled in the art can also be known, can adopt other mode to realize, as in existing LabelSet object; Semanteme through expanding existing LabelSet object and the LabelSet object resolved mode can reach same effect.
Further; Those skilled in the art can know that the embodiment of the invention provides part label information (or the part in the label value) in PBB-TE, to be specially VID; But being not limited to VID, also can be other information (part of IP address such as IPV6 addresses preceding 32).The thought of the part label information that the embodiment of the invention is provided is applied in other the technical field, for example, and the IPV6 technology; When in the IPV6 network, being provided as connection-oriented service, owing to (20bit) form the label of transmitting usefulness by the destination address in the IPV6 head (128bit)+stream label (Flow Label), wherein stream label can be used for identification service; Therefore the processing of convection tags is similar with the processing to VID; Principle is identical, and method is similar, repeats no more.
Part steps in the embodiment of the invention can utilize software to realize that corresponding software programs can be stored in the storage medium that can read, like CD or hard disk etc.
More than be merely preferred embodiment of the present invention, or not all within spirit of the present invention and principle in order to restriction the present invention, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a label distribution method is characterized in that, said method comprises:
Ingress node sends label distribution message; Said label distribution message is carried subtab information and matched rule information; Wherein, Said subtab information is used for identifying the scope that said Ingress node is hoped the downstream label value subtab that Egress node distributes, in the subtab that the said Egress node of said matched rule message identification distributes to the matching degree of this scope;
Said Egress node receives said label distribution message, according to said subtab information and matched rule information, judges whether to accept said subtab information; If; Then generate the downstream label, and said downstream label is put into Resv message, upstream so is sent; Make the node of receiving said Resv message cross matrix, till Ingress node according to said downstream tag configurations downstream direction.
2. label distribution method according to claim 1 is characterized in that, further comprises at least one intermediate node between said Ingress node and said Egress node;
Correspondingly, said method is specially:
Ingress node sends label distribution message; Said label distribution message is carried subtab information and matched rule information; Wherein, Said subtab information is used for identifying the scope that said Ingress node is hoped the downstream label value subtab that Egress node distributes, in the subtab that the said Egress node of said matched rule message identification distributes to the matching degree of this scope;
Said intermediate node receives said label distribution message, according to said subtab information and matched rule information, judges whether to accept the label that carries in the said subtab information, if then transmit said label distribution message;
Said Egress node receives said label distribution message, according to said subtab information and matched rule information, judges whether to accept said subtab information; If; Then generate the downstream label, and said downstream label is put into Resv message, upstream so is sent;
Said intermediate node is received said Resv message, according to the cross matrix of said downstream tag configurations downstream direction, and said downstream label is sent to Ingress node.
3. label distribution method according to claim 1 is characterized in that, said label distribution message carries subtab information and matched rule information is specially:
Carry said subtab information and matched rule information through the subtab object in the said label distribution message.
4. label distribution method according to claim 1 is characterized in that, said label distribution message is specially Path message or Call message; Said subtab information is specially virtual local area network identifiers or IP address designator.
5. a label distribution system is characterized in that, said system comprises inlet node device and Egress node equipment;
Said Ingress node equipment comprises:
Generation module; Be used to generate label distribution message; Said label distribution message is carried subtab information and matched rule information; Wherein, said subtab information is used for identifying the scope that said Ingress node is hoped the downstream label value subtab that Egress node distributes, in the subtab that the said Egress node of said matched rule message identification distributes to the matching degree of this scope;
Sending module is used to send the label distribution message that said generation module generates;
Said Egress node equipment comprises:
Receiver module is used to receive said label distribution message;
Judge module is used for according to said subtab information and matched rule information, judges whether to accept said subtab information;
Processing module; The result who is used for judging when said judge module is for being; Then generate the downstream label, and said downstream label is put into Resv message, upstream so is sent; Make the node of receiving said Resv message cross matrix, till Ingress node according to said downstream tag configurations downstream direction.
6. label distribution as claimed in claim 5 system is characterized in that said system also comprises at least one intermediary device between said Ingress node equipment and said Egress node equipment;
Said intermediary device comprises:
First receiver module is used to receive the said label distribution message that said Ingress node equipment sends;
Judge module is used for the said subtab information and the matched rule information of carrying according to the said label distribution message that said first receiver module receives, and judges whether to accept the label that carries in the said subtab information;
Forwarding module, the result who is used for judging when said judge module is for being then to transmit said label distribution message;
Second receiver module is used for after said Egress node equipment is put into Resv message with the downstream label that generates, receiving the said Resv message that said Egress node equipment sends;
Processing module, the cross matrix of the downstream tag configurations downstream direction of the said Resv message that is used for receiving according to said second receiver module, and transmit said downstream label to Ingress node.
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| CN1510874A (en) * | 2002-12-26 | 2004-07-07 | ��Ϊ��������˾ | Method for constructing bidirectional lable swap path in optical network |
| CN1859431A (en) * | 2005-04-30 | 2006-11-08 | 中兴通讯股份有限公司 | Method for realizing two-way marked exchange path |
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| CN1510874A (en) * | 2002-12-26 | 2004-07-07 | ��Ϊ��������˾ | Method for constructing bidirectional lable swap path in optical network |
| CN1859431A (en) * | 2005-04-30 | 2006-11-08 | 中兴通讯股份有限公司 | Method for realizing two-way marked exchange path |
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