CN1710868A - Cross-over end-to-end connection setting method for main apparatus protection in automatic exchange optical network - Google Patents
Cross-over end-to-end connection setting method for main apparatus protection in automatic exchange optical network Download PDFInfo
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Abstract
The method includes steps: (1) source node calculates routes of satisfying constrained condition for working route and protecting route respectively; (2) first, source node initiates signaling for building working route; when signaling reaches boundary node between domains of downstream network domain, the method calculates specific routes in this network domain of working route first, then builds connections in this domain of working route; (3) after working route point to point is built successfully, the source node initiates signaling for building protecting route; when signaling reaches boundary node between domains of downstream, the method asks boundary node between domains of working route for route information in this domain of working route; after obtaining response, the method calculates specific routes in this domain of protecting route and builds connections. Route information in a domain is shielded for other domain. The invention guarantees a straightway of communication.
Description
Technical field
The present invention relates to a kind of in communication network the method for building up of 1+1 main-apparatus protection; exactly; relate to the automatic method for building up that a kind of cross-domain end-to-end that is used for the 1+1 main-apparatus protection of ASON connects, belong to the 1+1 main-apparatus protection technical field in the optical communication network.
Background technology
Along with developing rapidly of Network, people are to the various demands for higher performance of optical communication network: the structure of wishing network is more flexible, Network Management is unified flexibly, bandwidth has higher utilance, higher survivability and better extensibility, the business that dynamic connection can be provided and support effectively to face the future is so ASON ASON arises at the historic moment.
Conventional optical network has only the plane of transmission and management plane, and ASON is then formed by transmitting plane, management plane and control plane, and having control plane is the key point that ASON is different from conventional optical network.Introducing by control plane, in conjunction with networking mode flexibly, ASON can be realized the co-ordination between service network and the transmission net, make optical transport network begin progressively to change into the role that end-to-end connection is provided from the role that capacity only is provided, and finally under the environment of multi-vendor, multi-operator, realize the interoperability of network, simultaneously for the client provides more new business type, for operator provides new business model.
In recent years, ASON ASON technology as ASON has become an important breakthrough that transmits network technology, cause the extensive concern and the attention of equipment manufacturers, telecom operators and research institution, made the ASON technology obtain remarkable progress.
The ASON network can provide the kinds of protect Restoration Mechanism, and the 1+1 main-apparatus protection in path is exactly one of them.Realizing interoperability in the multiple-domain network environment, set up various the connection end to end flexibly is an important goal of ASON network.But present ASON network can only provide 1+1 main-apparatus protection in single domain, wherein is divided into two kinds of schemes again, below brief description it.
Referring to Fig. 1, introduce first kind of scheme: 1+1 main-apparatus protection path must end in identical node.In network domains A, the operating path A1 of 1+1 main-apparatus protection and protection path A 2 all end in node A and Node B; In network domains B, the operating path B1 of 1+1 main-apparatus protection and protection path B2 all end in nodes X and node Z; And between the territory, only adopt single node to carry out fixedly connected (B-X).Between the territory, the 1+1 main-apparatus protection can't be realized like this, the inefficacy of boundary node between domain-to-domain link and territory can't be resisted.
Referring to Fig. 2, introduce second kind of scheme: broadcast-type " 1+1 " protection, promptly the operating path of 1+1 main-apparatus protection ends in different nodes respectively with the protection path, its essence is that a kind of broadcast-type connects.In network domains A, two end nodes of operating path A1 are respectively node A and Node B, and two end nodes of protection path A 2 are respectively node A and node C; In network domains B, two end nodes of operating path B1 are respectively node Z and nodes X, and two end nodes of protection path B2 are respectively node Z and node Y; Between two network domains A, B, then adopt binodal fixedly connected (B-X, C-Y).By above-mentioned three sections connections of serial connection respectively separately, can realize cross-domain 1+1 protection.Therefore, second kind of scheme compared with first kind of scheme, and its advanced part is that it can resist the inefficacy of domain-to-domain link and single boundary node, keeps circuit unimpeded.But it can not be set up end to end automatically by signaling and connect, and the connection of this broadcast-type " 1+1 " main-apparatus protection generally is that producer is privately owned, can only realize in single domain, can not cross-domainly set up.
At present; set up simple cross-domain end-to-end connection though can demonstrate; but the ENNI standard of ASON is ripe not enough, can't set up the cross-domain end-to-end connection with 1+1 main-apparatus protection attribute automatically, and cross-domain 1+1 protection can't be provided for the business of high quality-of-service.This problem has become the focus of insider's concern.
Summary of the invention
In view of this; the automatic method for building up that the purpose of this invention is to provide a kind of cross-domain end-to-end connection of the 1+1 main-apparatus protection in ASON; this method can be set up the cross-domain end-to-end connection with 1+1 protection attribute automatically; two transmission lines of forming primary channel; business is adopted " dual transmitting and receiving " strategy, to guarantee the unimpeded incessantly operation of communication service.
In order to achieve the above object, the invention provides a kind of automatic method for building up of the cross-domain end-to-end connection of 1+1 main-apparatus protection in ASON ASON, the feature of this method is to comprise following operating procedure:
(1) source node is respectively the operating path of 1+1 and the route that the protection path computing satisfies various constraintss;
(2) source node initiates to set up the signaling of operating path earlier, when this signaling arrives between the territory in downstream network territory boundary node, this boundary node is responsible for further calculating the concrete route of this operating path in the present networks territory, sets up the connection of this operating path in the present networks territory again; At this moment, the routing iinformation of operating path in certain network domains shields for other network domains;
(3) after operating path is successfully set up end to end, source node initiates to set up the signaling in protection path again, when this signaling arrives between the territory in downstream network territory boundary node, the boundary node in this boundary node elder generation inquired work path, after obtaining the routing iinformation of operating path in the present networks territory, calculate the concrete route of protection path in the present networks territory again, so that satisfy the route restriction condition of protection path and operating path; In the present networks territory, set up the connection in protection path then; At this moment, the routing iinformation of protection path in certain network domains shields for other network domains.
Source node is that operating path and protection path are when calculating the route of selection respectively in the described step (1); can only obtain interior concrete route of this source node place network and the abstract route in the downstream network territory; promptly can't calculate operating path and the concrete route of protecting the path in the downstream network territory, only obtain this operating path and boundary node and the terminal note of protecting the path in the downstream network territory.
The constraints in described operating path and protection path comprises that at least the route in these two paths must separate, to improve the survivability of connection.
Carry the 1+1 protection attribute of connection in the connection signaling message of setting up operating path or protection path that source node is initiated in described step (2) or (3).
Send to by a network domains in described step (2) or (3) and do not contain this in the modern message of letter of another network domains and be connected concrete routing iinformation in the present networks territory, guarantee that by this operating path in certain network domains or the routing iinformation in protection path shield for other network domains.
At least adopt two group nodes to interconnect between two network domains.
Described territory interface is the network of outside and the interface ENNI between the network.
The present invention is a kind of method of setting up the cross-domain end-to-end connection with 1+1 protection attribute in ASON ASON automatically, and its innovation part technically is: set up in the process in connection, build operating path earlier, build the protection path again.When the signaling of connect (comprise operating path and protection path) arrived the boundary node in downstream network territory, boundary node was responsible for calculating this and is connected concrete route in the present networks territory.The routing iinformation that each bar is connected in certain network domains shields for the another one network domains, avoids the network information in the territory to external leakage.In addition; setting up in the process of protection path; except the network domains at source node place; boundary node need be inquired the routing iinformation of this operating path in the present networks territory to boundary node between the territory of its corresponding operating path between the territory in protection path, is met to guarantee the route restriction condition of this protection path operating path corresponding with it in the present networks territory.
Therefore, method of the present invention with the advantage that existing 1+1 protection technology is compared is: adopt method of the present invention, can have the cross-domain end-to-end connection of 1+1 protection characteristic by automatic foundation of ASON control plane, and satisfy the route restriction condition.And the 1+1 protection that uses this method to set up connects, and the inefficacy that can effectively resist domain-to-domain link and single boundary node is more safe and reliable.
Description of drawings
Fig. 1 is first kind of scheme of prior art: the operating path of 1+1 main-apparatus protection and protection path end in the syndeton of same node point and form schematic diagram.
Fig. 2 is second kind of scheme of prior art: the syndeton in the operating path of broadcast-type 1+1 main-apparatus protection and protection path is formed schematic diagram.
Fig. 3 is the present invention has the cross-domain end-to-end connection of 1+1 protected in ASON an automatic method for building up flow diagram.
The cross-domain end-to-end syndeton with 1+1 protected operating path and protection path that Fig. 4 is to use the inventive method to set up is formed schematic diagram.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Referring to Fig. 3, the present invention is a kind of automatic method for building up that has the cross-domain end-to-end connection of 1+1 protected in ASON, comprises following operating procedure:
(1) source node is respectively the operating path of 1+1 and the route that the protection path computing satisfies various constraintss;
(2) source node initiates to set up the signaling of operating path earlier, when this signaling arrives between the territory in downstream network territory boundary node, this boundary node is responsible for further calculating the concrete route of this operating path in the present networks territory, sets up the connection of this operating path in the present networks territory again; At this moment, the routing iinformation of operating path in certain network domains shields for other network domains;
(3) after operating path is successfully set up end to end, source node initiates to set up the signaling in protection path again, when this letter is modern when arriving between the territory in downstream network territory boundary node, the boundary node in this boundary node elder generation inquired work path, after obtaining the routing iinformation of operating path in the present networks territory, calculate the concrete route of protection path in the present networks territory again, so that satisfy the route restriction condition of protection path and operating path; In the present networks territory, set up the connection in protection path then; At this moment, the routing iinformation of protection path in certain network domains shields for other network domains.
Referring to Fig. 4, specifically introduce the applying step of the inventive method in conjunction with an embodiment.Be that to adopt the boundary node of dual node interconnection: network domains A be Node B and node C between the territory of two network domains A and B, the boundary node of network domains B is nodes X and node Y; Adopt outside network and the interface ENNI agreement between the network between the territory.
When needs set up from node A to node Z have the end-to-end connection of 1+1 protection attribute the time; be respectively operating path and protect path computing to satisfy the route of various constraintss by source node A earlier; it can obtain the interior concrete route of network domains A at its place; but can't calculate operating path and the concrete route of protecting the path in network domains B, can only obtain the abstract route in the network domains B: boundary node X, Y and the terminal note Z of network domains B passed through in operating path and protection path respectively.
After route was calculated and finished, source node A initiated to connect and sets up signaling: build operating path earlier, build the protection path again.Must carry the 1+1 protection attribute of connection in the signaling message of being initiated, and, should not comprise this in the signaling message that network domains sends for another network domains and be connected concrete routing iinformation in the present networks territory.
When the signaling message of setting up operating path arrives the boundary node X of network domains B, because source node A can not the concrete route of evaluation work path in network domains B, just do not carry the relevant explicit route information of this operating path in network domains B in the signaling message yet, the boundary node X of network domains B must further calculate the concrete route of this operating path in network domains B, sets up the connection of operating path in network domains B again.
After operating path was successfully set up end to end, source node A initiated to set up the signaling in protection path again.Equally, when this signaling message arrived another boundary node Y of network domains B, node Y must recomputate the concrete route of protection path in network domains B.At this moment; the concrete routing iinformation of operating path in network domains B that node Y also should not connect; for two route restriction conditions satisfying operating path and protection path (for example: operating path and protect the path to separate; to improve the survivability that connects); node Y will send apply for information to nodes X; to obtain the concrete routing iinformation of operating path in network domains B, so that can guarantee operating path and the protection path route restriction condition in the present networks territory.Then.Node Y just further calculates and selects the route of protection path in network domains B, sets up the protection connection of path in network domains B again.
After the protection path was successfully set up, the cross-domain end-to-end connection with 1+1 protection attribute had just automatically successfully been set up.
Claims (7)
1, a kind of automatic method for building up of cross-domain end-to-end connection of the 1+1 main-apparatus protection in ASON is characterized in that: comprise following operating procedure:
(1) source node is respectively the operating path of 1+1 and the route that the protection path computing satisfies various constraintss;
(2) source node initiates to set up the signaling of operating path earlier, when this signaling arrives between the territory in downstream network territory boundary node, this boundary node is responsible for further calculating the concrete route of this operating path in the present networks territory, sets up the connection of this operating path in the present networks territory again; At this moment, the routing iinformation of operating path in certain network domains shields for other network domains;
(3) after operating path is successfully set up end to end, source node initiates to set up the signaling in protection path again, when this signaling arrives between the territory in downstream network territory boundary node, the boundary node in this boundary node elder generation inquired work path, after obtaining the routing iinformation of operating path in the present networks territory, calculate the concrete route of protection path in the present networks territory again, so that satisfy the route restriction condition of protection path and operating path; In the present networks territory, set up the connection in protection path then; At this moment, the routing iinformation of protection path in certain network domains shields for other network domains.
2, the automatic method for building up of the cross-domain end-to-end connection of 1+1 main-apparatus protection according to claim 1; it is characterized in that: source node is that operating path and protection path are when calculating the route of selection respectively in the described step (1); can only obtain interior concrete route of this source node place network domains and the abstract route in the downstream network territory; promptly can't calculate operating path and the concrete route of protecting the path in the downstream network territory, only obtain this operating path and boundary node and the terminal note of protecting the path in the downstream network territory.
3, the automatic method for building up of the primary channel of the cross-domain end-to-end connection of 1+1 main-apparatus protection according to claim 1; it is characterized in that: the constraints in described operating path and protection path comprises that at least the route in these two paths must separate, to improve the survivability of connection.
4, the automatic method for building up of the cross-domain end-to-end connection of 1+1 main-apparatus protection according to claim 1 is characterized in that: the 1+1 protection attribute that carries connection in the connection signaling message of setting up operating path or protection path that source node is initiated in described step (2) or (3).
5, according to the automatic method for building up of the cross-domain end-to-end connection of claim 1 or 3 described 1+1 main-apparatus protections; it is characterized in that: send to by a network domains in described step (2) or (3) and do not contain this in the signaling message of another network domains and be connected concrete routing iinformation in the present networks territory, guarantee that by this operating path in certain network domains or the routing iinformation in protection path shield for other network domains.
6, the automatic method for building up of the cross-domain end-to-end connection of 1+1 main-apparatus protection according to claim 1 is characterized in that: adopt two group nodes to interconnect at least between two network domains.
7, the implementation method of the primary channel of the cross-domain end-to-end connection of 1+1 main-apparatus protection according to claim 1 or 5 is characterized in that: described territory interface is outside network and the interface ENNI between the network.
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Address after: 20, building 109, West Zhongshan Avenue, Tianhe District, Guangzhou, Guangdong Patentee after: GUANGDONG RESEARCH INSTITUTE, CHINA TELECOM Co.,Ltd. Address before: No. 109, Zhongshan Avenue, Tianhe District, Guangdong, Guangzhou Patentee before: Guangdong Telecommunication Co.,Ltd. Institude |
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| TR01 | Transfer of patent right |
Effective date of registration: 20091030 Address after: No. 31, Finance Street, Beijing, Xicheng District Patentee after: CHINA TELECOM Corp.,Ltd. Address before: 20, building 109, West Zhongshan Avenue, Tianhe District, Guangzhou, Guangdong Patentee before: GUANGDONG RESEARCH INSTITUTE, CHINA TELECOM Co.,Ltd. |