CN100512177C - Method for sharing group-broadcasting tree time gap in automatic-exchange light network - Google Patents
Method for sharing group-broadcasting tree time gap in automatic-exchange light network Download PDFInfo
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- CN100512177C CN100512177C CNB2006100606479A CN200610060647A CN100512177C CN 100512177 C CN100512177 C CN 100512177C CN B2006100606479 A CNB2006100606479 A CN B2006100606479A CN 200610060647 A CN200610060647 A CN 200610060647A CN 100512177 C CN100512177 C CN 100512177C
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Abstract
This invention discloses a method of realizing multicast tree time slot sharing in automatic switching optical network. The sharing entrance of time slot method of this invention includes: when the leaf nodes on multicast tree need assign entrance time slot, judge whether there is any member of the multicast trees uses the same entrance index on the stated nodes, if it dose, then it will share the entrance time slot with the stated multicast tree group. The method of sharing entrance of time slot in this invention includes: judge whether leaf nodes and multicast tree group have the same entrance index, entrance time slot and export index on the assigned export time slot, and the stated nodes export time slot is the same with downstream node entrance slot, if it dose, then it will share the export time slot with the stated multicast tree group when rebuild and repeat route, this makes full use of the time slot resource.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of method that multicast tree time slot is shared in ASON (Automatic SwitchedOptical Network ASON).
Background technology
ASON is the optical transfer network of new generation that can finish optical-fiber network exchange linkage function automatically.By in traditional optical transfer network, introducing control plane, can realize the automatic establishment of teleservice, protection automatically and recovery are found and realized to resource automatically when fault takes place.Because ASON possesses high reliability, extensibility and high-efficiency advantage, ASON replaces traditional optical transport network has become a kind of trend.
On the other hand, along with people are more and more higher to the demand of communication, begin to occur as video conference call, VOD service and multicast service demand such as DB Backup in many ways.For supporting the multicast service of these types, need in transmit network, set up and safeguard a multicast tree.Multicast tree is meant that a source network element is to the unidirectional tree-shaped connection with fixed-bandwidth between the network element of a plurality of places in the transmission network.The source network element of wherein said multicast tree is commonly referred to root node, and each place network element in the described multicast tree is commonly referred to leaf node.Can be used for supporting above-mentioned multicast service demand by in transmission network, setting up multicast tree, but, multicast service is significantly increased than traditional business to the requirement of bandwidth and network performance, and existing traditional optical transport network still can not adapt to the requirement of the large-scale application of multicast service.
For the advantage of utilizing ASON self satisfies the demand of client to multicast service, being implemented in provides effective point-to-multipoint delivery to connect in the large scale network, need set up and safeguard a multicast tree with traffic engineering on ASON.ASON is by the automatic establishment and the deletion of control plane realization multicast tree, and the interpolation of leaf and deletion, thereby realizes the automatic establishment and the deletion of multicast service.When how to be implemented in leaf node interpolation, deletion and heavy-route, share time interval resource as much as possible, and existing ASON system do not carried out big change, support clean culture the basis on realize support to multicast service, this present industry does not still have the mature technique scheme.
Expanded the foundation of RSVP-TE (ResourcereSerVe Protocol-Traffic Engineering RSVP flow-engineering expansion) among the ITEF manuscript draft-ietf-mpls-rsvp-te-p2mp-01.txt with the multicast service of support P2MP (putting multiple spot).Wherein label is shared is to belong to same multicast tree by judgement to come the shared port label; What use when optimization or heavy-route is the shared label technique that 4.6.4. saves described shared demonstration (SE) mode among the RFC3209; Support the protection of quick heavy-route (Fast Reroute) mode.This shows:
1, in the prior art scheme, downstream node can't know that the time slot of upstream node shares situation, therefore, when having increased leaf node or existing leaf node heavy-route in the multicast tree newly, shared port time slot and outlet time slot fully.
2, the label distribution of SE mode, and the fast realization of heavy-route a plurality of interconnections of all needing to set up multiple source to a place, and a plurality of interconnections of multiple source to a place relatively are difficult to realize on TDM (the Time Division Multiplexing time division multiplexing) Fabric Interface of existing ASON system.In existing ASON, can not set up the interconnection of multiple source to a place between the TDM Fabric Interface, have only the interconnection of setting up the dual transmitting and receiving type at most.
3, though the technical scheme of prior art can realize the foundation of the multicast service of P2MP, but realization more complicated, a lot of objects have been revised, such as Session Object (session object), Sender_TemplateObject (sender's object), Filter_SPEC Object (filter object), and expanded many new objects, such as S2L Sub-LSP Object (subtab switching path object), subtab switching path SUB_Explicit_Route Object (route display object), Sub_Record_Route Object (subtab switching path record routing object).In existing ASON system, support these objects need make the modification of large amount of complex to system.
Summary of the invention
The invention provides a kind of method that multicast tree time slot is shared in ASON, be used to solve that prior art exists can not fully effectively share time interval resource and need and big modification is made by existing ASON system could realize the multicast service problem.
The objective of the invention is to be achieved through the following technical solutions:
A kind of multicast tree shared port time slot method that in ASON, realizes, comprise: when the leaf node generation heavy-route of the multicast tree of having set up, node on the heavy-route path judges whether described heavy-route leaf node has original path at this node, when judged result for being, judge further that then the time slot of receiving shares the inlet time slot and the described heavy-route path that mark whether to sharing original path and used identical inlet index with described original path at this node; Be then to share the inlet time slot of described original path at this node;
When described multicast tree increased new leaf node, the node on the path of described new leaf node judged whether that the multicast tree member has used identical inlet index at this node, be then with described multicast tree member shared port time slot.
This method further comprises:
When the node on the described heavy-route path can't share described original path the inlet time slot time, judging whether further that then other multicast tree member uses identical inlet index at this node, is then to share the inlet time slot that described other multicast tree member uses at this node.
This method further comprises: when can not be with described original path shared port time slot, time slot is shared mark be revised as the inlet time slot of not sharing original path, pass to downstream node.
Wherein, described time slot is shared the root node be marked at described multicast tree and is initialized as the inlet time slot of sharing original path, carry by the Path message of RSVP, from root node to the leaf node transmission.
Wherein, described multicast tree member comprises all leaf nodes through the identical multicast tree ID sign of having of described node.
Beneficial effect of the present invention is: the present invention realizes not increasing complexity and supporting the foundation of multicast service and protection to recover on the automatic establishment of teleservice and the basis that protection recovers at original ASON.When newly-built leaf node, the multicast tree member that new leaf node can and have same multicast tree ID sign shares time slot; During the leaf heavy-route, not only can share time slot, and can share time slot with the leaf of other heavy-route with original path.Another fermentation, leaf node can also be shared the outlet time slot with the multicast tree member, has made full use of time interval resource, and can set up and keep the good tree of multicast tree.
Description of drawings
Fig. 1 sets up the schematic diagram of multicast tree in ASON for the present invention;
Fig. 2 is the leaf node shared port time slot method flow chart of the multicast tree of the present invention in ASON;
The schematic diagram of the leaf node heavy-route of the multicast tree that Fig. 3 sets up in ASON for the present invention;
Fig. 4 is the multicast tree leaf node of the foundation of the present invention in the ASON schematic diagram of heavy-route repeatedly;
Fig. 5 shares outlet time slot method flow chart for the leaf node of the multicast tree of the present invention in ASON.
Embodiment
Core of the present invention is: when the node of leaf node on multicast tree need distribute inlet during time slot, judge whether that the multicast tree member has used identical inlet index at described node, be then with described multicast tree member shared port time slot.When the node of leaf node on multicast tree need distribute the outlet time slot, judge leaf node and multicast tree member distribute whether used identical inlet index, inlet time slot and outlet index on the node that exports time slot at need, and the outlet time slot of described node is identical with the inlet time slot of downstream node, is then to share the outlet time slot with described multicast tree member.
Based on core concept of the present invention technical scheme provided by the invention is further described below.
The multicast tree of creating in ASON needs the signalling module by expansion ASON, increases the object of an overall multicast tree ID sign, and root node is associated to each independent teleservice of leaf node.Can realize the automatic establishment and the deletion of multicast service, the interpolation of leaf and deletion.
Be illustrated in figure 1 as the schematic diagram of in ASON, setting up multicast tree, letter representation node wherein, numeral interface index (include stomochord draw and export index).Root node is at node A, and four leaf nodes are respectively Node B, F, G, E, and node C, D are intermediate node.In described multicast tree, root node A is an one way traffic to leaf node B, F, G, E transmission.The time slot allocation module of each node is all preserved multicast tree member's information on the multicast tree.Multicast tree member is meant all leaf nodes through the identical multicast tree ID sign of having of this node.When existing leaf node carried out heavy-route, this leaf that is to say that to two members should be arranged original path also is the multicast tree member before not deleting.
The time slot allocation process of multicast tree in ASON when creating is: each node from the root node to the leaf node distributes the inlet time slot of this section point when receiving the PATH Path of RSVP, up to each leaf node; Leaf node distributes the outlet time slot of this node then, and the inlet time slot that carries this node in Resv message sends to upstream node, upstream node distributes a mouthful time slot when receiving the Resv message of downstream node, this outlet time slot equals the inlet time slot of the downstream node that carries in the Resv message.
After described multicast tree is set up each leaf one by one, the label switching path LSP 1 of leaf node B (Lable Switch Path): A2 → B1, the label switching path LSP 2:A2 of leaf node F → B3 → C1 → F1, the label switching path LSP 3:A2 of leaf node G → B3 → C2 → D1 → G1, the label switching path LSP 4:A2 of leaf node E → B3 → C2 → D3 → E1.The interconnection of root node A:LSP1, LSP2, LSP3, LSP4 shared port time slot and outlet time slot and homology; At Node B: LSP1, LSP2, LSP3, LSP4 shared port time slot, LSP2, LSP3, LSP4 share outlet time slot and same interconnection; At node C, LSP2, LSP3, LSP4 shared port time slot, LSP3, LSP4 share outlet time slot and same interconnection; At node D, LSP3, LSP4 shared port time slot.In the constructive process of multicast tree, the foundation on the label switching path LSP of each leaf each node in multicast tree does not have special requirement in proper order, and such as in Node B, four leaf processing sequences follow the processing sequence at node A leaf not require the same.
In this multicast tree, the situation of sharing time slot has two kinds, and the one, a shared port time slot shows as the interconnection of homology; Another kind is while shared port time slot and outlet time slot, shows as and shares same interconnection.If two leaves do not have the shared port time slot, then do not share the outlet time slot yet, avoid setting up the interconnection of dual transmitting and receiving.Leaf is newly-built, share time slot during the leaf heavy-route as far as possible, can not discharge the time slot that other leaves are shared during the leaf deletion.If two leaves do not have the shared port time slot, then do not share the outlet time slot yet, otherwise need set up the interconnection of dual transmitting and receiving.
After multicast tree is created, when multicast tree has new leaf node adding or existing leaf node to need heavy-route, share mark with a time slot and identify whether to share original path inlet time slot, this time slot is shared and to be marked at root node and to be initialized as the inlet time slot that can share original path, and is delivered to the downstream leaf node by the Path message of RSVP RSVP from root node.
Below in conjunction with accompanying drawing the time slot in the multicast tree provided by the invention being shared method is described in further detail.
Shared port provided by the invention time slot method specifically comprises the steps: as shown in Figure 2
S201, at first judging on a certain node to need to distribute the leaf node of inlet time slot whether original path is arranged on this node, is execution in step S202 then, otherwise execution in step S203;
If this leaf node is newly-built leaf node, then this leaf node all nodes on its path all do not have original path, and the root node of multicast tree can be shared mark with time slot and be revised as the inlet time slot of not sharing original path when distributing the inlet time slot;
If this leaf node is the leaf node of heavy-route, distributing at need on the node of inlet time slot does not have original path, and the original path that then shows this leaf node is without this node, then in this node heavy-route path can not with original path shared port time slot.
S202, judging that the time slot receive is shared and marks whether to sharing the inlet time slot of original path, is execution in step S204 then, otherwise execution in step S205;
Whether S203, have the multicast tree member to use identical inlet index on this node, be execution in step S210 then, otherwise execution in step S211;
Whether the inlet index that use at this node in S204, the heavy-route path of judging leaf is identical with the inlet index that original path uses, and is execution in step S206 then, otherwise execution in step S207;
S205, eliminating and original path use the multicast tree member of identical inlet time slot at this node, and execution in step 207 then;
The inlet time slot of S206, shared original path, execution in step S212 then;
Whether S207, have the heavy-route path of multicast tree member and leaf node to use identical inlet index at this node, be execution in step S208 then, otherwise execution in step 209;
S208, shared this member's inlet time slot is shared time slot with mark simultaneously and is revised as the inlet time slot of not sharing original path; Execution in step S212 then;
S209, the new inlet time slot of distribution are shared time slot with mark simultaneously and are revised as the inlet time slot of not sharing original path, execution in step S212 then;
S210, shared this class members's inlet time slot is shared time slot with mark simultaneously and is revised as the inlet time slot of not sharing original path; Execution in step S212 then;
S211, the new inlet time slot of distribution are shared time slot with mark simultaneously and are revised as the inlet time slot of not sharing original path; Execution in step S212 then;
S212, time slot is shared mark send to downstream node by Path message.
Shared port time slot method below in conjunction with the leaf of 1 pair of multicast tree in ASON of accompanying drawing when newly-built is described in further detail.
As shown in Figure 1: root node is at node A, and four leaves are respectively at Node B, F, G, E, and node C, D are intermediate node.It is to become new leaf node in the multicast tree of root that intermediate node D adds with node A, and the label switched path of leaf node D (hereinafter to be referred as the path) is A2 → B3 → C2 → D3.At this moment, each node on the path of node D all needs to inquire about the time slot allocation module of this node, and whether search multicast tree member has used identical inlet index at each node; At root node A, time slot is shared mark and is initialized as the inlet time slot of sharing original path, because leaf node D is the leaf node that newly adds multicast tree, all node A, B on its path, C, D all do not have original path, therefore share mark at root node A time slot and be modified to the inlet time slot of not sharing original path, and the shared mark of time slot is mail to downstream node by Path message.
On root node A and leaf node B, all members of this multicast tree-be that leaf node B, F, G, E have used identical inlet index, therefore newly-built leaf node D can with leaf node B, F, G, E shared port time slot; At node C, newly-built leaf node D also can with leaf node F, G, E shared port time slot; If the member that do not have in the multicast tree has used identical inlet index with newly-built leaf on this node, then distribute new inlet time slot.
When distributing the outlet time slot, take out the inlet time slot of the entrained downstream node of Resv message, whether the inquiry multicast tree has other members to satisfy is used identical inlet index, inlet time slot and outlet index, and the outlet time slot is identical with the inlet time slot that downstream node carries, then share outlet time slot and interconnection if having, if then do not distribute outlet time slot (equaling the inlet time slot of downstream node), set up new interconnection.
Time slot below in conjunction with accompanying drawing during to the leaf heavy-route is shared method and is done detailed explanation.
The simple scenario that has only a leaf below with regard to multicast tree, the time slot during to the leaf heavy-route are shared method and are described in further detail.As shown in Figure 3, A is a root node, and D is a leaf node, wherein numeral interface index (include stomochord draw and export index).The original tag path is A1 → B2 → C1 → D2, and behind the B2 link failure, the heavy-route path is A1 → B3 → C1 → D2.
3 how shared port time slot of leaf node D each node on its heavy-route path is described with reference to the accompanying drawings below.At root node A, time slot is shared mark and is initialized as the inlet time slot of sharing original path; At node A, B, heavy-route path and the original path of leaf node D used identical inlet index, therefore can share the inlet time slot of original path; At node C, because the inlet index different with original path used in the heavy-route path, so distribute new inlet time slot, the shared mark of time slot changes the inlet time slot of not sharing original path into by the inlet time slot of initialized shared original path simultaneously; And by passing to downstream node D in the Path message; The time slot that node D receives is shared and is labeled as the inlet time slot of not sharing original path, so the inlet time slot of D node can not be shared the inlet time slot of original path; Node D need inquire about the time slot allocation module of this node, get rid of with after original path has used the multicast tree member of identical inlet time slot at this node, whether search also has the multicast tree member to use identical inlet index, if have, at D node and this class members shared port index, then do not need to distribute new inlet time slot.
When distributing the outlet time slot, shared outlet time slot method with newly-built leaf node is identical, need to distribute whether to exist member's (member comprises original path) to satisfy in the querying node multicast tree of time slot to have used identical inlet index, outlet index and inlet time slot, and the outlet time slot is identical with the inlet time slot in downstream; Above-mentioned condition all satisfies then shares outlet time slot and interconnection, does not then distribute new outlet time slot, sets up new interconnection.
As shown in Figure 3, at node C, the outlet time slot equals the inlet time slot of node D, and is different with the outlet time slot of original path, so need redistribute the outlet time slot at the C node.Therefore, can not set up the interconnection of dual transmitting and receiving at intermediate node C; In Node B, the outlet time slot of outlet time slot and original path is different, but the inlet time slot is identical, thus the shared homology of path after the heavy-route and original path interconnection; At node A, the outlet time slot is the same with original path, then shares same interconnection with original path.
Further considering the situation of two or more leaves, still is example with Fig. 3, and A is a root node, and E, F are leaf node.The original path of leaf node E is that the original path of A1 → B2 → C1 → D4 → E1, leaf node F is A1 → B2 → C1 → D3 → F1, and they share time slot and interconnection at node A, B, C.During the B2 link failure, leaf node E, F need set up new path, and the heavy-route path of leaf node E is heavy-route path A 1 → B3 → C1 → D3 → F1 of A1 → B3 → C1 → D4 → E1, leaf node F.At node A, B, heavy-route path and the original path of leaf E, F used identical inlet index, thus the heavy-route path can with original path shared port time slot.At node C, the inlet index different with original path used at the C node in the heavy-route path of leaf node E, F, the C node is the time slot allocation module of this node of inquiry earlier, search has the multicast tree member of same multicast tree ID sign, whether confirm has the multicast tree member to use identical inlet index at the C node, the inlet time slot of sharing these members is arranged then, and just upstream node is shared mark by the time slot of Path message transmission and is changed the inlet time slot of not sharing original path into by the inlet time slot of the shared original path of initial condition; Otherwise leaf node E, F redistribute the inlet time slot at the C node, and the shared mark of described time slot is revised as the inlet time slot of not sharing original path.
Especially, when leaf node E, F heavy-route, at the D node, leaf node E is labeled as the inlet time slot of not sharing original path because time slot is shared, so leaf node E can redistribute new inlet time slot when distributing the inlet time slot; Leaf F is labeled as the time slot of not sharing original path because time slot is shared when distributing the inlet time slot, can get rid of the inlet time slot that original path uses at the D node, but can share the inlet time slot that distributes after the leaf E heavy-route.After the heavy-route success, original path will be deleted.
Below in conjunction with accompanying drawing 4 describe leaf node repeatedly the time slot during heavy-route share situation.As shown in Figure 4, A is a root node, and B, C, D are three leaf nodes.The path is respectively A1 → B, A2 → C, A3 → D, and behind the A1 link failure, leaf node B heavy-route path is A3 → D2 → B.At the A node, the interconnection of leaf node B and leaf D shared port time slot and homology.After then A3 breaks down again, leaf B, D heavy-route, the heavy-route path is respectively A2 → C1 → D2 → B, A2 → C1 → D, at the A node, three leaf shared port time slots and interconnection, at node C, leaf B, C share time slot and interconnection.
By the above as can be seen, the leaf node in the multicast tree adopts technical scheme of the present invention can not only share the time slot of original path during through heavy-route repeatedly, and can share distributed time slot after other leaf heavy-routes, fully shares time interval resource; And each leaf is set up or the process of heavy-route is independently, and on each node of multicast tree, the order of the newly-built or heavy-route of leaf does not require, and can dynamically increase or delete leaf node.On the other hand, adopt technical scheme of the present invention need not set up the interconnection of dual transmitting and receiving, effectively reduce complexity, can keep the good tree of multicast tree at intermediate node.
Accordingly, the present invention also provides a kind of multicast tree that realizes in ASON to share the outlet time slot method, as shown in Figure 5, comprises the steps:
Step 501: described node obtains the inlet time slot of downstream node;
Step 502: whether have the multicast tree member to use identical inlet index, inlet time slot and outlet index, and the outlet time slot is identical with the inlet time slot of downstream node at described node; Be execution in step 503 then, otherwise execution in step 504;
Step 503: and described multicast tree member is at described nodes sharing outlet time slot;
Step 504: distribute new outlet time slot at described node.
Detailed process is: when the node of leaf node on its path need distribute the outlet time slot, the Resv message that described node sends from downstream node obtained the inlet time slot of its downstream node that carries; Whether inquiry has multicast tree member (original path that comprises the leaf node of heavy-route) to satisfy is used identical inlet index, outlet index and inlet time slot, and the outlet time slot is identical with the inlet time slot of downstream node, then share outlet time slot and interconnection if having, if then do not distribute outlet time slot (equaling the inlet time slot of downstream node), set up new interconnection.
Adopt the technical scheme of shared outlet time slot provided by the invention, leaf node can be shared the outlet time slot with the multicast tree member, has made full use of time interval resource.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (5)
1, a kind of multicast tree shared port time slot method that in ASON, realizes, comprise: when the leaf node generation heavy-route of the multicast tree of having set up, node on the heavy-route path judges whether described heavy-route leaf node has original path at this node, when judged result for being, judge further that then the time slot of receiving shares the inlet time slot and the described heavy-route path that mark whether to sharing original path and used identical inlet index with described original path at this node; Be then to share the inlet time slot of described original path at this node;
When described multicast tree increased new leaf node, the node on the path of described new leaf node judged whether that the multicast tree member has used identical inlet index at this node, be then with described multicast tree member shared port time slot.
2, the method for claim 1 is characterized in that, described method further comprises:
When the node on the described heavy-route path can't share described original path the inlet time slot time, judging whether further that then other multicast tree member uses identical inlet index at this node, is then to share the inlet time slot that described other multicast tree member uses at this node.
3, method as claimed in claim 1 or 2 is characterized in that, described method further comprises: when can not be with described original path shared port time slot, time slot is shared mark be revised as the inlet time slot of not sharing original path, pass to downstream node.
4, method as claimed in claim 3 is characterized in that, described time slot is shared the root node be marked at described multicast tree and is initialized as the inlet time slot of sharing original path, carry by the Path message of RSVP, from root node to the leaf node transmission.
5, method as claimed in claim 4 is characterized in that, described multicast tree member comprises all leaf nodes through the identical multicast tree ID sign of having of described node.
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