WO2012088978A1 - 波分网络中建立路径的方法、通信节点和通信系统 - Google Patents

波分网络中建立路径的方法、通信节点和通信系统 Download PDF

Info

Publication number
WO2012088978A1
WO2012088978A1 PCT/CN2011/083006 CN2011083006W WO2012088978A1 WO 2012088978 A1 WO2012088978 A1 WO 2012088978A1 CN 2011083006 W CN2011083006 W CN 2011083006W WO 2012088978 A1 WO2012088978 A1 WO 2012088978A1
Authority
WO
WIPO (PCT)
Prior art keywords
node
path
wavelength
link
information
Prior art date
Application number
PCT/CN2011/083006
Other languages
English (en)
French (fr)
Inventor
孙俊
吴传军
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP11853752.1A priority Critical patent/EP2648351A4/en
Publication of WO2012088978A1 publication Critical patent/WO2012088978A1/zh

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0267—Optical signaling or routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0256—Optical medium access at the optical channel layer
    • H04J14/0257—Wavelength assignment algorithms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0267—Optical signaling or routing
    • H04J14/0268—Restoration of optical paths, e.g. p-cycles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0278—WDM optical network architectures
    • H04J14/0284—WDM mesh architectures

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, a communication node, and a communication system for establishing a path in a wavelength division network. Background technique
  • traffic path congestion is most likely due to the fact that the path does not have wavelength consistency, ie there is no consistent wavelength available on the link on the path.
  • the route calculation first determines the wavelength information used by the path, and carries the available wavelength set of the path through the signaling, and transmits the hop by hop along the routing direction, and the available wavelength of the path is passed every one hop.
  • the set of available wavelengths of the set and the next hop link intersects, and finally the sink node receives the end-to-end path available wavelength set and selects the wavelength used by the path in this wavelength set.
  • the link to the first node is faulty. The first node uses this fault information to pass
  • the Crankback mechanism bypasses the faulty link and recalculates the path.
  • the CrankBack technology refers to a signaling mechanism that initiates a new route to the source node of the service to the source node of the service if a resource is blocked, such as a link failure, or the node fails.
  • the blocked link is bypassed as a faulty link, which may cause a path query failure and cause traffic congestion. If the service path from the source node to the sink node is established, if the downstream link and the previous path do not have the same available wavelength, the link is not available, and the source first node starts the Crankback mechanism, and the link is recalculated. If the road fails, the business is blocked. However, at this time, the link still has the possibility of utilizing, that is, there may be other valid paths in the network including the link. However, the prior art cannot find the path, resulting in traffic congestion. The solution in the prior art is likely to miss the effective path between the nodes, so that the risk of traffic congestion is large. Summary of the invention
  • the invention provides a method for establishing a path in a wavelength division network, a communication node and a communication system.
  • the available wavelength information is fed back to the source node, so that the source node can recalculate the new path to reduce the traffic congestion rate. .
  • the present invention provides a method for establishing a path in a wavelength division network, including:
  • the source node establishes a first path to the sink node
  • the source node receives the failure information of the intermediate node from the first path, where the failure information includes available wavelength information of the outbound link of the intermediate node, and the outbound link and the upstream link of the intermediate node on the first path Does not have wavelength consistency;
  • the source node calculates a second path to the sink node based on available wavelength information of the outbound link of the intermediate node.
  • the invention also provides a communication node, comprising:
  • a receiving module configured to receive failure information of an intermediate node from the first path
  • a calculation module configured to calculate a second path to the sink node according to the available wavelength information of the outbound link of the intermediate node; the failure information includes available wavelength information of the outbound link of the intermediate node, where the The link does not have wavelength consistency with the upstream link of the intermediate node on the first path.
  • the present invention also provides a wavelength division network communication system, comprising at least three nodes, which are applied to establish a path between a source node and a sink node in which the establishment is established,
  • the source node of the path is used to calculate the failure information of the intermediate node from the first path when the first path to the sink node is established, according to the available wavelength information of the outbound link of the intermediate node.
  • the second path of the sink node; the failure information includes available wavelength information of the outbound link of the intermediate node, and the outgoing link does not have wavelength consistency with the upstream link of the intermediate node on the first path ;
  • An intermediate node of the first path configured to detect an outgoing link and an upstream chain in the first path When the path does not have wavelength consistency, the failure information is sent to the source node.
  • the intermediate node finds that there is no available wavelength resource on the link, the intermediate node returns detailed wavelength information available to the source node to cause the path to be blocked. The source node can then recalculate the new path using the available wavelength information to reduce the traffic congestion rate.
  • FIG. 1 is a flowchart of a method for establishing a path in a wavelength division network according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a method for establishing a path in a wavelength division network according to an embodiment of the present invention
  • a topology diagram of the provided wavelength division network
  • FIG. 4 is a schematic structural diagram of a communication node according to an embodiment of the present invention. detailed description
  • the source node and the sink node fail to establish a path, the valid path cannot be re-established according to the wavelength information of the link, causing traffic congestion.
  • the present invention is directed to the problem in the wavelength division network, by subdividing the cause of the path establishment failure, and notifying the cause of the link failure that causes the service establishment failure (if there is no common available wavelength, the wavelength of the link in the path is inconsistent), At the same time, the available wavelength information is given.
  • the source node does not completely exclude the link. Instead, the source uses the available wavelength information of the link returned by Crankback to conditionally use the link without causing loss of the effective path, thereby reducing the traffic congestion rate.
  • the link from the source node to the sink node of the path fails to be established in the wavelength division network
  • the intermediate node that finds the problem notifies the source node.
  • the path establishment failed, and the reason for the blockage is due to the outbound chain of the intermediate node.
  • the path does not have wavelength consistency with the upstream link, and the outgoing link is all links to the sink node in the link of the node; the upstream link, that is, the link from the source node to the intermediate node on the path, does not have
  • the wavelength consistency that is, on all links of the outgoing link of the intermediate node and the upstream link of the intermediate node, does not have a consistent wavelength available.
  • the available information of the outgoing link of the intermediate node is also given in the failure information.
  • the source node After receiving the path establishment failure information, the source node first re-calculates the service path by excluding the egress link of the intermediate node. If the calculation path fails, it determines that the link is a critical link, and the source node does not exclude the link, but The available link of the source node is determined by the available wavelength of the link, and the calculation is performed again. If the calculation path is successful, the source node of the service restarts the path information establishment process.
  • FIG. 1 is a flowchart of a method for establishing a path in a wavelength division network according to a first embodiment of the present invention, including:
  • Step 11 The source node establishes a first path to the sink node.
  • the source node When the source node first establishes a path with the sink node, it pre-calculates the path and then attempts to establish the path connection.
  • Step 12 The source node receives failure information of the intermediate node from the first path, where the failure information includes available wavelength information of the outbound link of the intermediate node, and the outbound link and the intermediate node on the first path
  • the upstream link does not have wavelength consistency
  • an intermediate node that is a certain path detects that the path cannot be established due to the wavelength inconsistency, it sends a failure information to the source node to notify the source node of the intermediate node.
  • the link does not have wavelength consistency with the upstream link of the intermediate node, and the path needs to be re-established.
  • the failure information includes available wavelength information of the outbound link of the intermediate node, so that the source node calculates a new path to the sink node according to the available wavelength information.
  • Step 13 The source node calculates a second path to the sink node according to the available wavelength information of the outbound link of the intermediate node.
  • the path to the sink node may be re-established in the following two manners:
  • the source node selects the source node according to the available wavelength information of the outbound link of the intermediate node.
  • the outgoing link, the outgoing link of the source node and the outgoing link of the intermediate node have the same wavelength. That is, the source node determines the link and the consistent wavelength by using the available wavelength information as a constraint, and establishes a new second path according to the outgoing link and the consistent wavelength.
  • the source node determines the outgoing link of the source node according to the wavelength set ⁇ 1, 2, 3, 4 ⁇ , the source
  • the wavelength on the outgoing link of the node and the wavelength set ⁇ 1,2,3,4 ⁇ can have an intersection.
  • the wavelength set of the link between the source node and the node is ⁇ 1,2,5,6,8 ⁇
  • the node can be used as the next node of the source node. If the wavelength set of the link between the source node and the node is ⁇ 5, 6, 7 ⁇ , it cannot be the next node of the source node.
  • the intersection of the outbound link of the source node and the wavelength set ⁇ 1, 2, 3, 4 ⁇ is ⁇ 1, 2 ⁇ , and the egress link of the source node and the egress link of the source node are determined.
  • the source node can recalculate the new path to the sink node. That is, according to the source node outgoing link, the new second path is recalculated with the wavelength set ⁇ 1, 2 ⁇ .
  • the source node selects an outbound link of the source node according to the available wavelength information of the outbound link of the intermediate node, and the outbound link of the source node and the outbound link of the intermediate node have the same wavelength.
  • the source node notifies the downstream node of the outbound link of the source node to calculate the second path to the sink node according to the consistency wavelength.
  • a new path to the sink node is established by using a hop-by-hop calculation route through the downstream path of the source node.
  • the manner in which the source node notifies the downstream node may be configured to send the path information, where the path establishment information includes the consistent wavelength, so that the downstream node establishes the second path according to the consistent wavelength.
  • the source node does not recalculate the path, and only determines the next node of the source node, which is referred to as a node, by using the source node outgoing link and the outbound link of the intermediate node (hereinafter referred to as the uniform wavelength 1). 2.
  • a new path is established through node 2 and each downstream node.
  • the node 2 After receiving the notification from the source node, the node 2 determines the outgoing link of the node 2 according to the consistent wavelength 1, and the wavelength used by the outgoing link of the node 2 can intersect with the consistent wavelength 1, and the intersection is a uniform wavelength 2, the node 2 According to the outgoing link and the consistent wavelength 2, determine the next node of its own (hereinafter referred to as node 3), and node 3 continues to establish the path to the sink node in a hop-by-hop manner according to the consistent wavelength 2; The same way as above Establish a path to the sink node, thereby gradually establishing a path to the sink node.
  • the intermediate node in the process of establishing a service path, if the intermediate node finds that there is no available wavelength resource on the link, the intermediate node not only returns to the source node, but also causes the service path to be blocked, and returns the detailed available wavelength information that causes the path to be blocked. Therefore, the source node can use the available wavelength information to recalculate the new path to avoid blocking the service path.
  • FIG. 1 a flow chart of a method for establishing a road in a wavelength division network according to a second embodiment of the present invention is shown in the following figure:
  • Step 21 The source node calculates a path between the sink nodes, and sends path information to the intermediate node in the path to try to establish a first path with the sink node.
  • the source node performs the service path calculation according to the constraint condition of the service, for example, the optimal path is calculated according to the optimal path calculation method in the prior art. If the calculation fails, the failure information is returned directly.
  • the source node After calculating the service path from the source node to the sink node, the source node starts the path establishment process, and sends the establishment path information to the downstream node, where the setup path information carries the wavelength set of all the links from the source node and the complete Business path information.
  • Step 22 After receiving the path information, the intermediate node in the path determines whether the outbound link of the node has wavelength consistency with the upstream link according to the established path information. If not, sending a failure message to the source node, where the failure information includes available wavelength information of the outbound link of the intermediate node.
  • the intermediate node of the service path After receiving the path information, the intermediate node of the service path determines the available resources of the path, and determines whether the outgoing link of the local node has wavelength consistency with the upstream link. If not, the service source node is notified that the path establishment fails and returns.
  • the wavelength consistency error and the available wavelength information of the current out link such as the available wavelength set of the link from the source node to an intermediate node are ⁇ 1, 2, 3 ⁇ , and the wavelength set of the outbound link of the intermediate node is ⁇ 4,5 ⁇ , the intermediate node determines that there is no wavelength consistency, and returns a failure information to the source node.
  • the intermediate node detects wavelength consistency, such as the available wavelength set of the link from the source node to an intermediate node is ⁇ 1, 2, 3 ⁇ , the wavelength set of the outgoing link of the intermediate node is ⁇ 2. , 3 ⁇ , the intermediate node reserves relevant resources, and obtains the consistent wavelength ⁇ 2, 3 ⁇ of the link and the upstream link, And along the path direction, forwarding the updated signaling message to the downstream node, where the updated signaling message includes the consistent wavelength, such as the wavelength set ⁇ 2, 3 ⁇ described above.
  • the other nodes are processed in the same way. If there are consistent wavelengths, the path to the sink node is established successfully.
  • Step 23 After receiving the path establishment failure information, the source node re-establishes the second path to the sink node according to the available wavelength information and using the available wavelength information as a constraint.
  • the source node receives the failure information of an intermediate node, and the reason for the failure is "wavelength consistency error", the outgoing link of the intermediate node is no longer excluded, but the link is conditionally used, that is, the process of calculating the path
  • the wavelength of the available link is used as a constraint to calculate whether there is a consistent wavelength for the wavelengths used by other known links. If there is a consistent wavelength, the link is not excluded.
  • the source node recalculates the calculation path. If the calculation is successful, the signaling process is started.
  • the outbound link of the intermediate node is abandoned, and other links are selected for recalculation, and if the calculation still fails, The business returned to the business failed, and the business was blocked.
  • the hop-by-hop forwarding mode may also be adopted.
  • the source node determines, according to the available wavelength information of the intermediate node, the source node outgoing link and the source node outgoing link and the outbound link of the intermediate node.
  • the next node informing the source node establishes a link to the sink node based on the consistent wavelength.
  • the next node further establishes a link between the node and the next node according to the consistent wavelength, and gradually forwards the link to the downstream node. This method can reduce the burden of the source node without calculating the path, but may reduce the efficiency of establishing the path. .
  • the service sink node determines the available resources of the path after receiving the path information. If the check passes and there is a consistent available wavelength, the sink node selects the determined wavelength from the available consistent wavelength set to establish a service cross. At the same time, a service establishment confirmation message is sent to the upstream node. The upstream node uses the wavelength selected by the sink node, and then sends a service establishment confirmation message to the upstream node of the node until the source node of the service. After receiving the service establishment confirmation message, the source node of the service performs data transmission on the established path according to the received confirmation message by using the wavelength selected by the sink node.
  • the method for establishing a path in a wavelength division network is described in detail below with reference to a specific application scenario.
  • the following uses the network topology diagram shown in FIG. 3 as an example to describe a method for establishing a path between a source node and a sink node, as shown in FIG. It is necessary to establish a service path from node A to node F.
  • the link number in the figure is the wavelength information available for the link. For example, 1234 on the link of node A to node B indicates that the available wavelength set of the link is ⁇ 1,2,3,4 ⁇ :
  • the way to create a path is as follows:
  • the service source node A calculates the service path from the node A to the node F, and calculates that the optimal service path is ABCEF.
  • the source node A sends the establishment path information to the downstream node B, where the information includes the downstream node information BCEF of the service path, and The available wavelength set information ⁇ 1, 2, 3, 4 ⁇ so far.
  • the node B After receiving the service path establishment information, the node B detects the available wavelength set information. If there is a consistent wavelength, the node sends the established path information to the downstream node C, where the information carries the updated service route CEF and the available wavelength set information ⁇ 1 , 2, 3, 4 ⁇ ; The downstream node C performs similar processing, and after completing the processing of the node, transmits the service path establishment information to the node E.
  • the node E After receiving the service path establishment information, the node E detects whether there is a consistent available wavelength. If not, the node E sends a path establishment failure message to the service source node A, and returns the failure reason "no uniform wavelength", and the carrier causes the congestion chain.
  • the available wavelength information for the road ⁇ 5, 6, 7, 8 ⁇ .
  • the source node A After receiving the path establishment failure information, the source node A excludes the link that caused the path establishment failure to recalculate the path. If the calculation fails, the link is a critical link because the reason for the failure is "no consistent available wavelength". The source node A no longer excludes the link, but determines the outgoing link available to the source node based on the available wavelength information of the returned node E, excluding the outgoing link of the source node A without the consistent wavelength. In this example, path AB is excluded, recalculated, and the final business path is ADGCEF. Source node A restarts the process of establishing a path information.
  • the path establishment when the path establishment fails, the path is re-established by eliminating the wrong path until the establishment is successful or until the path is blocked.
  • the hop-by-hop route can also be used to establish a path using the link of the available wavelength. That is, starting from the source node, it is established one by one according to the available wavelengths until the path to the sink node is established.
  • the following is a way to establish a path hop by hop.
  • the network topology diagram shown in Figure 3 is taken as an example to illustrate that it is necessary to establish a wavelength service path from node A to node F.
  • the method of establishing a path hop by hop is as follows:
  • the service source node A calculates the service path from the node A to the node F, and the optimal service path is ABCEF.
  • the source node A sends the establishment path information to the downstream node B, and the information includes the downstream detailed industry.
  • the node B After receiving the service path establishment information, the node B detects the available wavelength set information. If there is a consistent wavelength, the node sends the established path information to the downstream node C, where the information carries the updated service route CEF and the available wavelength set information ⁇ 1 , 2, 3, 4 ⁇ ; The downstream node C performs similar processing, and after completing the processing of the node, transmits the service path establishment information to the node E.
  • the node E After receiving the service path establishment information, the node E detects whether there is a consistent available wavelength. If not, the node E sends a path establishment failure message to the service source node A, and returns the failure reason "no uniform wavelength", and the carrier causes the congestion chain.
  • the available wavelength information for the road ⁇ 5, 6, 7, 8 ⁇ .
  • the source node A uses the available wavelength set ⁇ 5, 6, 7, 8 ⁇ as the initial value and constraint condition of the available wavelength set, and establishes the path by hop-by-hop routing.
  • node A uses the available wavelength set ⁇ 5,6,7,8 ⁇ as the constraint to calculate the route from node A to the last node F, but only uses the next hop information in the route.
  • node A selects the link AD.
  • Node A updates the path available wavelength set to ⁇ 5, 6 ⁇ and sends a signaling message to the downstream node D.
  • the node D After receiving the signaling message sent by the upstream node A, the node D uses the available wavelength set ⁇ 5, 6 ⁇ as a constraint to calculate the route from the node D to the last node F, but only uses the next hop information in the route, in this example Node D selects the link DG as the next hop link, the node D updates the path available wavelength set to ⁇ 5, 6 ⁇ , and sends a signaling message to the downstream node G. The above process is repeated until the signaling reaches the end node F.
  • the available wavelength set of the path is ⁇ 5, 6 ⁇ , and the last node determines the wavelength used by the service in the set according to a certain policy, such as the wavelength 5, and then sends an acknowledgement message to the upstream node until the node is reached.
  • a certain policy such as the wavelength 5
  • the final established service path is A-D-G-C-E-F with a wavelength of 5.
  • the intermediate node in the process of establishing a service path, if the intermediate node finds that there is no available wavelength resource on the link, the intermediate node not only returns to the source node, but also causes the service path to be blocked, and returns the detailed available wavelength information that causes the path to be blocked. Therefore, the source node can use the available wavelength information to recalculate the new path to avoid blocking the service path.
  • FIG. 4 is a schematic structural diagram of a communication node according to an embodiment of the present invention, including:
  • An establishing module 41 configured to establish a first path to the sink node;
  • the receiving module 42 is configured to receive the failure information of the intermediate node from the first path, and the calculating module 43 is configured to calculate the second path to the sink node according to the available wavelength information of the outbound link of the intermediate node;
  • the failure information includes available wavelength information of the outbound link of the intermediate node, and the outgoing link does not have wavelength consistency with the upstream link of the intermediate node on the first path.
  • the establishing module 41 is configured to send the establishing path information to the intermediate node in the first path to establish the first path.
  • the second path when the second path is re-established, the second path may be established by the source node, where the calculating module 43 is configured to select the source node according to the available wavelength information of the outgoing link of the intermediate node.
  • the outbound link of the source node and the outbound link of the intermediate node have a consistent wavelength; and the second path to the sink node is calculated according to the outbound link of the source node and the consistent wavelength.
  • the route may be calculated by hop-by-hop.
  • the downstream node After the source node determines the outgoing link and the consistent wavelength, the downstream node establishes a link to the sink node in a hop-by-hop manner.
  • the calculating module 43 is configured to select an outbound link of the source node according to the available wavelength information of the outbound link of the intermediate node, where the outbound link of the source node and the outbound link of the intermediate node have a consistent wavelength; Notifying the outbound link downstream node of the source node to establish a second path to the sink node according to the consistent wavelength.
  • the intermediate node in the process of establishing a service path, if the intermediate node finds that there is no available wavelength resource on the link, the intermediate node not only returns to the source node, but also causes the service path to be blocked, and returns the detailed available wavelength information that causes the path to be blocked. Therefore, the source node can use the available wavelength information to recalculate the new path to avoid blocking the service path.
  • An embodiment of the present invention provides a WDM network communication system, including at least two nodes, which are used to establish a path between any two nodes.
  • the service initiating node is a source node.
  • the service end point is a sink node, and the intermediate node between the source node and the sink node.
  • the source node is configured to, when establishing the first path to the sink node, receive failure information from the intermediate node of the first path, according to the intermediate node Calculating the second path of the sink node by using the available wavelength information of the out link;
  • An intermediate node configured to send, to the source node, failure information, when the detected link and the upstream link in the first path do not have wavelength consistency, where the failure information includes an available link of the intermediate node The wavelength information, the outgoing link does not have wavelength consistency with the upstream link of the intermediate node on the first path.
  • the source node When the first path is established, the source node sends path establishment information to the intermediate node in the first path to establish the first path.
  • the path may be recalculated by the source node, that is, the source node selects the outbound link of the source node according to the available wavelength information of the outbound link of the intermediate node. And the outbound link of the source node and the outbound link of the intermediate node have a consistent wavelength; and calculate a second path to the sink node according to the outbound link of the source node and the consistent wavelength.
  • the hop-by-hop route may also be used, that is, the source node is configured to use the available wavelength information as a constraint, and select an outbound link of the source node according to the available wavelength information of the outbound link of the intermediate node, where the source The outbound link of the node and the outbound link of the intermediate node have a consistent wavelength; and the outbound link downstream node of the source node is notified to establish a second path to the sink node according to the consistent wavelength.
  • the intermediate node in the process of establishing a service path, if the intermediate node finds that there is no available wavelength resource on the link, the intermediate node not only returns to the source node, but also causes the service path to be blocked, and returns the detailed available wavelength information that causes the path to be blocked. Therefore, the source node can use the available wavelength information to recalculate the new path to avoid blocking the service path.
  • modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the embodiment, or may be correspondingly changed in one or more apparatuses different from the embodiment.
  • the modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.
  • serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments.
  • a person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed.
  • the foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Description

波分网络中建立路径的方法、 通信节点和通信系统 技术领域
本发明涉及通信技术领域， 特别涉及一种波分网络中建立路径的方法、 通信节点和通信系统。 背景技术
在波分网络中， 业务路径堵塞很可能是因为该路径不具有波长一致性所 导致的， 即该路径上的链路上不具有可用的一致波长。
现有技术的方案中， 源节点建立路径时， 路由计算先不确定路径使用的 波长信息， 通过信令携带路径可用波长集， 沿着路由方向逐跳传递， 每经过 一跳就将路径可用波长集和下一跳链路的可用波长集求交集， 最后宿节点将 收到端到端的路径可用波长集， 并在此波长集中选择路径使用的波长。 在建 立路径的过程中， 如果发现路径中间某个节点沿着下游方向的路径可用波长 集为空， 则返回首节点该条链路故障。 首节点利用这个故障信息， 通过
Crankback机制， 绕过故障链路重新算路。 CrankBack技术是指在建立路径的 过程中如果遇到资源阻塞如链路故障， 或者节点失效时， 由资源阻塞的节点 向业务的源节点发起重新寻找新路由的信令机制。
但是现有技术中方案在寻找新的路由时， 将阻塞链路作为故障链路而绕 过， 有可能造成路径查询失败而造成业务堵塞。 如建立源节点到宿节点的业 务路径时， 若发现下游链路与前面路径没有共同可用波长， 则返回该链路不 可用，源首节点启动 Crankback机制，排除该链路重新计算路径，若算路失败， 则业务被堵塞。 但此时该链路仍有利用的可能， 即网络中可能存在包含该链 路的其他有效路径。 但现有技术无法找到该条路径， 导致业务堵塞。 现有技 术中的方案很有可能遗漏建立节点间的有效路径， 从而使得业务堵塞的风险 较大。 发明内容
本发明提供一种波分网络中建立路径的方法、 通信节点和通信系统， 在 业务路径建立失败时， 反馈给源节点可用波长信息， 使源节点可以重新进行 计算新的路径以降低业务堵塞率。
本发明提供了一种波分网络中建立路径的方法， 包括：
源节点建立到宿节点的第一路径；
源节点接收来自第一路径的中间节点的失败信息 , 所述失败信息包括所 述中间节点的出链路的可用波长信息， 所述出链路与第一路径上所述中间节 点的上游链路不具有波长一致性；
源节点根据所述中间节点的出链路的可用波长信息计算到所述宿节点的 第二路径。
本发明还提供了一种通信节点， 包括：
建立模块， 用于建立到宿节点的第一路径；
接收模块， 用于接收到来自第一路径的中间节点的失败信息；
计算模块， 用于根据所述中间节点的出链路的可用波长信息计算到所述 宿节点的第二路径； 所述失败信息包括所述中间节点的出链路的可用波长信 息， 所述出链路与第一路径上所述中间节点的上游链路不具有波长一致性。
本发明还提供了一种波分网络通信系统， 包括至少三个节点， 其应用于 建立建立其中的源节点与宿节点之间的路径，
所述路径的源节点， 用于在建立到宿节点的第一路径时， 若接收到来自 第一路径的中间节点的失败信息， 则根据所述中间节点的出链路的可用波长 信息计算到所述宿节点的第二路径； 所述失败信息包括所述中间节点的出链 路的可用波长信息， 所述出链路与第一路径上所述中间节点的上游链路不具 有波长一致性；
所述第一路径的中间节点， 用于在检测到出链路与第一路径中的上游链 路不具有波长一致性时， 向所述源节点发送所述失败信息。
本发明在业务路径建立过程中， 中间节点如果发现链路上没有可用波长 资源， 则返回给源节点导致路径堵塞的详细可用波长信息。 由此源节点就可 以使用该可用波长信息重新进行计算新的路径， 以降低业务堵塞率。 附图说明
图 1为本发明一实施例提供的波分网络中建立路径的方法流程图； 图 2为本发明一实施例提供的波分网络中建立路径的方法流程图； 图 3为本发明一实施例提供的波分网络的拓朴结构图；
图 4为本发明一实施例提供的通信节点的结构示意图。 具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚， 下面将结合本发 明实施例中的附图， 对本发明实施例中的技术方案进行清楚、 完整地描述， 显然， 所描述的实施例是本发明一部分实施例， 而不是全部的实施例。 基于 本发明中的实施例， 本领域普通技术人员在没有作出创造性劳动前提下所获 得的所有其它实施例， 都属于本发明保护的范围。
鉴于现有技术中的波分网络， 源节点和宿节点路径建立失败时， 不能根 据链路的波长信息重新建立有效的路径， 造成业务堵塞。 本发明针对波分网 络中存在的这种问题， 通过对路径建立失败原因进行细分， 告知导致业务建 立失败的链路失败原因（如没有共同的可用波长，路径中链路的波长不一致 ), 同时给出可用波长信息。 源节点在进行 Crankback时， 不再完全排除该链路， 而是利用 Crankback返回的该链路的可用波长信息有条件地使用该链路，不会 导致有效路径的丢失， 从而降低业务堵塞率。
本发明的技术方案中， 当在波分网络中路径的源节点到宿节点的链路建 立失败时， 如果是因为波长一致性的问题导致了路径的失败， 则发现问题的 中间节点通知源节点路径建立失败， 通知堵塞原因是由于该中间节点的出链 路与上游链路不具有波长一致性， 出链路即该节点的链路中通向宿节点的所 有链路； 上游链路即该路径上从源节点到该中间节点的链路， 不具有波长一 致性即在中间节点的出链路以及该中间节点的上游链路这些所有链路上， 不 具有可用的一致波长。
同时， 该失败信息中还给出了该中间节点的出链路的可用波长信息。 源 节点收到路径建立失败信息后， 首先排除该中间节点的出链路而重新计算业 务路径， 如果计算路径失败， 则确定此链路为关键链路， 源节点不再排除该 链路， 但以该链路的可用波长确定源节点的可用链路， 重新进行计算。 计算 路径成功则业务的源节点重新启动建立路径信息过程。
参见图 1所示为本发明第一实施例提供的波分网络中建立路径的方法流 程图， 包括：
步骤 11、 源节点建立到宿节点的第一路径。
源节点在初次建立与宿节点间的路径时， 预先计算出路径， 然后尝试建 立该路径连接。
步骤 12、 源节点接收来自第一路径的中间节点的失败信息， 所述失败信 息包括所述中间节点的出链路的可用波长信息， 所述出链路与第一路径上所 述中间节点的上游链路不具有波长一致性；
在本实施例中， 预先设置在建立路径的过程中， 作为某个路径的中间节 点如果检测到由于波长不一致导致路径无法建立， 则向源节点发送失败信息， 以通知源节点该中间节点的出链路与该中间节点的上游链路不具有波长一致 性， 需重新建立路径。 失败信息中包括该中间节点的出链路的可用波长信息， 以使得源节点根据该可用波长信息计算到宿节点的新的路径。 步骤 13、 源节点根据所述中间节点的出链路的可用波长信息计算到宿节 点的第二路径。
在本实施例中， 重新建立到所述宿节点的路径， 可以采用以下两种方式： 方式一， 源节点根据所述中间节点的出链路的可用波长信息选择源节点 的出链路， 该源节点的出链路和该中间节点的出链路有一致波长。 即该源节 点以所述可用波长信息为约束条件， 确定出链路和一致波长， 并根据出链路 和一致波长建立新的第二路径。
如该中间节点的可用波长信息为波长集 { 1 ,2,3 ,4 }时，则源节点才艮据该波长 集 { 1,2,3,4}确定源节点的出链路， 该源节点的出链路上的波长与波长集 { 1,2,3,4}能够有交集， 如源节点与一节点的链路采用的波长集为 { 1,2,5,6,8 } , 则该节点可以作为源节点的下一节点， 若源节点与一节点的链路采用的波长 集为 {5,6,7 } , 则不能作为源节点的下一节点。 以该源节点的出链路与波长集 { 1,2,3,4}的交集为 { 1,2}进行说明， 在确定了源节点的出链路， 以及该源节点 的出链路与该中间节点的出链路的一致波长后， 源节点就可以重新计算到宿 节点的新的路径。 即根据该源节点出链路， 以波长集 { 1,2}重新计算新的第二 路径。
方式二， 源节点根据所述中间节点的出链路的可用波长信息选择源节点 的出链路， 所述源节点的出链路和所述中间节点的出链路有一致波长。 源节 点通知源节点的出链路的下游节点根据所述一致性波长计算到所述宿节点的 第二路径。 以通过该源节点的下游路径， 采用逐跳计算路由的方式建立到宿 节点的新的路径。 源节点通知下游节点的方式可以采用发送建立路径信息的 方式， 该路径建立信息中包括该一致波长， 以使得下游节点根据该一致波长 建立第二路径。 该方式中， 源节点不重新计算路径， 仅以源节点出链路和该中间节点的 出链路的一致波长（以下称为一致波长 1 ), 确定源节点的下一节点， 以下称 为节点 2。通过节点 2和各个下游节点建立新的路径。 节点 2收到源节点的通 知后， 根据一致波长 1 , 确定节点 2的出链路， 且节点 2的出链路使用的波长 与该一致波长 1能够有交集， 该交集为一致波长 2, 节点 2根据出链路和一致 波长 2, 确定自身的下一节点（以下称为节点 3 ), 节点 3才艮据一致波长 2, 继 续采用逐跳的方式建立到宿节点的路径； 其他中间节点采用上述相同的方式 建立到宿节点的路径， 由此， 逐步建立到宿节点的路径。
本实施例中， 在业务路径建立过程中， 中间节点如果发现链路上没有可 用波长资源， 则不但返回给源节点导致业务路径堵塞的失败原因， 同时返回 导致路径的堵塞的详细可用波长信息。 由此源节点就可以使用该可用波长信 息重新进行计算新的路径， 避免造成业务路径堵塞。
参见图 所示为本发明第二实施例提供的波分网络中建立路的方法流程 图， 方法如下：
步骤 21、 源节点计算到宿节点之间的路径， 并向该路径中的中间节点下 发建立路径信息， 以尝试建立与宿节点之间的第一路径。
源节点根据业务的约束条件， 进行业务路径计算， 如根据现有技术中的 最优路径计算方法计算出最优路径。 如果计算失败， 则直接返回失败信息。 在计算出从源节点到宿节点的业务路径后， 源节点启动该建立路径过程， 向 下游节点发送建立路径信息 , 该建立路径信息中携带从源节点开始经过所有 链路的波长集以及完整的业务路径信息。
步骤 22、 该路径中的中间节点收到建立路径信息后， 根据所述建立路径 信息， 判断本节点的出链路是否与上游链路具有波长一致性。 如果没有， 则 向所述源节点发送失败信息， 其中， 失败信息包括该中间节点的出链路的可 用波长信息。
业务路径的中间节点收到建立路径信息后， 进行路径可用资源判断， 同 时判断本节点的出链路与上游链路有没有波长一致性， 如果没有， 则通知业 务源节点路径建立失败， 同时返回波长一致性错误以及当前出链路的可用波 长信息， 如源节点至一中间节点的链路的可用波长集为 { 1,2,3 } , 而该中间节 点的出链路的波长集为 {4,5 } , 则该中间节点判定不具有波长一致性， 向源节 点返回失败信息。
需要说明的是， 如果中间节点检测具有波长一致性， 如源节点到一中间 节点的链路的可用波长集为 { 1,2,3 }， 该中间节点的出链路的波长集为 {2,3 } , 则该中间节点预留相关资源， 获取出链路与上游链路的一致波长 {2,3 } , 同时 沿着路径方向， 向下游节点转发更新后的信令消息， 该更新后的信令消息中 包括该一致波长， 如上述的波长集 {2,3 }。 其他节点按照相同方式处理， 如果 都有一致波长， 则建立到宿节点的路径成功。
步骤 23、 源节点收到路径建立失败信息后， 根据所述可用波长信息， 以 所述可用波长信息为约束条件重新建立到所述宿节点的第二路径。
源节点收到某个中间节点的失败信息，且失败原因是"波长一致性错误" , 则不再排除该中间节点的出链路， 而是有条件使用该链路， 即在计算路径的 过程中， 以该出链路的可用波长信息为约束条件， 计算其他已知链路所采用 的波长是否存在一致波长， 如果有一致波长， 则不再排除该链路。 源节点重 新进行计算路径， 计算成功， 则启动信令过程。
如果源节点以该中间节点的出链路的可用波长信息计算出的路径不具有 波长一致性， 则放弃选择该中间节点的出链路， 选择其他链路重新进行计算， 如果仍然计算失败， 则返回业务算路失败， 业务被堵塞。
或者也可以采用逐跳转发的方式， 源节点根据该中间节点的可用波长信 息， 确定源节点出链路以及源节点出链路与该中间节点的出链路的一致波长。 通知源节点的下一节点根据该一致波长建立到宿节点的链路。 该下一节点再 根据该一致波长， 建立本节点与下一节点的链路， 逐步向下游节点转发， 该 方式能够使源节点不用计算路径， 降低了负担， 但可能由此降低建立路径的 效率。
在路径建立成功后， 业务的宿节点收到建立路径信息后， 进行路径可用 资源判断， 如果校验通过且有一致可用波长， 则宿节点从可用一致波长集中 选择确定使用的波长， 建立业务交叉， 同时向上游节点发送业务建立确认消 息。 上游节点使用宿节点选择的波长， 再向本节点的上游节点发送业务建立 确认消息， 直到业务的源节点。 业务的源节点收到业务建立确认消息， 则根 据收到的确认消息， 采用宿节点选择的波长， 在建立的路径上进行数据传输。
以下结合具体应用场景详细说明波分网络中建立路径的方法，以下以图 3 所示的网络拓朴图为例说明源节点与宿节点建立路径的方法， 如图 3所示， 设需要建立从节点 A到节点 F的业务路径， 图中链路数字为该条链路可用的 波长信息， 如节点 A到节点 B的链路上的 1234表示该链路的可用波长集为 { 1,2,3,4}: 建立路径的方法如下：
1、 业务源节点 A计算从节点 A到节点 F的业务路径， 计算得到最优业 务路径为 ABCEF; 源节点 A向下游节点 B发送建立路径信息，该信息包含业 务路径的下游节点信息 BCEF, 以及到目前为止的可用波长集信息 { 1,2,3,4}。
2、 节点 B收到业务路径建立信息后， 检测可用波长集信息， 如果有一致 波长， 则将建立路径信息传递到下游节点 C, 该信息中携带更新的业务路由 CEF以及可用波长集信息 { 1,2,3,4}; 下游节点 C进行类似处理， 完成本节点 的处理后， 将业务路径建立信息传递到节点 E。
3、 节点 E收到业务路径建立信息后， 检测有没有一致可用波长， 如果没 有， 则节点 E向业务源节点 A发送路径建立失败消息， 返回失败原因 "无一 致波长"， 同时携带导致堵塞链路的可用波长信息 {5,6,7,8}。
4、源节点 A收到路径建立失败信息后，排除导致路径建立失败的链路重 新算路， 算路失败， 则此链路为关键链路， 因为失败的原因是 "无一致可用 波长"， 源节点 A不再排除链路， 而是以返回的节点 E的可用波长信息确定源 节点可用的出链路， 排除没有一致波长的源节点 A的出链路。 在本例中， 则 路径 AB被排除， 重新计算， 最终业务路径为 ADGCEF。 源节点 A重新启动 建立路径信息过程。
上述实施例中， 在路径建立失败时， 采用排除错误路径的方式重新建立 路径， 直至建立成功或者直至确定路径堵塞。 除了采用上述方式， 在路径建 立失败时， 也可以采用逐跳路由的方式， 使用可用波长的链路建立路径。 即 从源节点开始， 根据可用波长， 逐条链路建立， 直至到建立到宿节点的路径。
以下是逐跳建立路径的方式，仍以图 3所示的网络拓朴图为例进行说明， 设需要建立从节点 A到节点 F波长业务路径。 逐跳建立路径的方法如下：
1、 业务源节点 A计算从节点 A到节点 F的业务路径， 最优业务路径为 ABCEF; 源节点 A向下游节点 B发送建立路径信息， 该信息包含下游详细业 务路径信息 BCEF, 以及到目前为止的可用波长集信息 { 1,2,3,4}。
2、 节点 B收到业务路径建立信息后， 检测可用波长集信息， 如果有一致 波长， 则将建立路径信息传递到下游节点 C, 该信息中携带更新的业务路由 CEF以及可用波长集信息 { 1,2,3,4}; 下游节点 C进行类似处理， 完成本节点 的处理后， 将业务路径建立信息传递到节点 E。
3、 节点 E收到业务路径建立信息后， 检测有没有一致可用波长， 如果没 有， 则节点 E向业务源节点 A发送路径建立失败消息， 返回失败原因 "无一 致波长"， 同时携带导致堵塞链路的可用波长信息 {5,6,7,8}。
4、 源节点 A收到路径建立失败信息后， 以可用波长集 {5,6,7,8}作为路径 可用波长集的初始值和约束条件， 采用逐跳路由方式建立路径。 首先节点 A 使用可用波长集 {5,6,7,8}为约束条件计算节点 A到末节点 F的路由， 但只使 用路由中的下一跳信息， 本例中节点 A会选择链路 A-D作为下一跳链路， 节 点 A更新路径可用波长集为 {5,6} ,并向下游节点 D发送信令消息。节点 D收 到上游节点 A发送的信令消息后， 使用可用波长集 {5,6}为约束条件计算节点 D到末节点 F的路由， 但只使用路由中的下一跳信息， 本例中节点 D会选择 链路 D-G作为下一跳链路， 节点 D更新路径可用波长集为 {5,6} , 并向下游节 点 G发送信令消息。 重复上述过程直到信令到达末节点 F。 宿节点 F收到业 务建立消息后， 路径可用波长集为 {5,6} , 末节点根据一定策略在此集合中确 定业务使用的波长，比如波长 5,然后向上游节点发送确认消息直至到节点 A。 根据上述过程， 最终建立的业务路径为 A-D-G-C-E-F, 波长为 5。
本实施例中， 在业务路径建立过程中， 中间节点如果发现链路上没有可 用波长资源， 则不但返回给源节点导致业务路径堵塞的失败原因， 同时返回 导致路径的堵塞的详细可用波长信息。 由此源节点就可以使用该可用波长信 息重新进行计算新的路径， 避免造成业务路径堵塞。
参见图 4所示为本发明一实施例提供的一种通信节点的结构示意图， 包 括：
建立模块 41 , 用于建立到宿节点的第一路径； 接收模块 42 , 用于接收到来自第一路径的中间节点的失败信息； 计算模块 43 , 用于根据所述中间节点的出链路的可用波长信息计算到所 述宿节点的第二路径； 所述失败信息包括所述中间节点的出链路的可用波长 信息， 所述出链路与第一路径上所述中间节点的上游链路不具有波长一致性。
其中， 在建立第一路径时， 该建立模块 41 , 用于向所述第一路径中的中 间节点下发建立路径信息， 以建立所述第一路径。
本实施例中， 在重新建立第二路径时， 可以采用由源节点建立第二路径 的方式， 所述计算模块 43 , 用于根据所述中间节点的出链路的可用波长信息 选择源节点的出链路， 所述源节点的出链路和所述中间节点的出链路有一致 波长； 根据所述源节点的出链路和所述一致波长计算到所述宿节点的第二路 径。
或者， 可以采用逐跳计算路由的方式， 源节点确定了出链路和一致波长 后， 由下游节点采用逐跳的方式建立到宿节点的链路。 所述计算模块 43 , 用 于根据所述中间节点的出链路的可用波长信息选择源节点的出链路， 所述源 节点的出链路和所述中间节点的出链路有一致波长； 通知所述源节点的出链 路下游节点根据所述一致波长建立到所述宿节点的第二路径。
本实施例中， 在业务路径建立过程中， 中间节点如果发现链路上没有可 用波长资源， 则不但返回给源节点导致业务路径堵塞的失败原因， 同时返回 导致路径的堵塞的详细可用波长信息。 由此源节点就可以使用该可用波长信 息重新进行计算新的路径， 避免造成业务路径堵塞。
本发明一实施例提供了一种波分网络通信系统， 包括至少两个节点， 其 应用于建立任意两个节点之间的路径， 本实施例中建立了路径时， 业务发起 节点为源节点是， 业务终点是宿节点， 源节点与宿节点之间的为中间节点。 对于在该通信系统中建立的任一路径， 其源节点， 用于在建立到宿节点 的第一路径时， 若接收到来自第一路径的中间节点的失败信息， 则根据所述 中间节点的出链路的可用波长信息计算到所述宿节点的第二路径； 中间节点， 用于在检测到链路与第一路径中的上游链路不具有波长一致 性时， 向所述源节点发送失败信息， 所述失败信息包括所述中间节点的出链 路的可用波长信息， 所述出链路与第一路径上所述中间节点的上游链路不具 有波长一致性。
在建立该第一路径时， 源节点向所述第一路径中的中间节点下发建立路 径信息， 以建立所述第一路径。
在本实施例实例， 在重新计算新的第二路径时， 可采用由源节点重新计 算路径的方式， 即源节点根据所述中间节点的出链路的可用波长信息选择源 节点的出链路， 所述源节点的出链路和所述中间节点的出链路有一致波长； 并根据所述源节点的出链路和所述一致波长计算到所述宿节点的第二路径。
也可以采用逐跳路由的方式， 即源节点用于以所述可用波长信息为约束 条件， 用于根据所述中间节点的出链路的可用波长信息选择源节点的出链 路， 所述源节点的出链路和所述中间节点的出链路有一致波长； 通知所述源 节点的出链路下游节点根据所述一致波长建立到所述宿节点的第二路径。
该通信系统中节点的功能及节点间的交互可参见图 5 对应实施例的记 载， 在此不再赘述。
本实施例中， 在业务路径建立过程中， 中间节点如果发现链路上没有可 用波长资源， 则不但返回给源节点导致业务路径堵塞的失败原因， 同时返回 导致路径的堵塞的详细可用波长信息。 由此源节点就可以使用该可用波长信 息重新进行计算新的路径， 避免造成业务路径堵塞。
本领域普通技术人员可以理解： 附图只是一个实施例的示意图， 附图中 的模块或流程并不一定是实施本发明所必须的。
本领域普通技术人员可以理解： 实施例中的装置中的模块可以按照实施 例描述分布于实施例的装置中， 也可以进行相应变化位于不同于本实施例的 一个或多个装置中。 上述实施例的模块可以合并为一个模块， 也可以进一步 拆分成多个子模块。
上述本发明实施例序号仅仅为了描述， 不代表实施例的优劣。 本领域普通技术人员可以理解： 实现上述方法实施例的全部或部分步骤 可以通过程序指令相关的硬件来完成， 前述的程序可以存储于一计算机可读 取存储介质中， 该程序在执行时， 执行包括上述方法实施例的步骤； 而前述 的存储介质包括： ROM、 RAM, 磁碟或者光盘等各种可以存储程序代码的介 质。
最后应说明的是： 以上实施例仅用以说明本发明的技术方案， 而非对其 限制； 尽管参照前述实施例对本发明进行了详细的说明， 本领域的普通技术 人员应当理解： 其依然可以对前述实施例所记载的技术方案进行修改， 或者 对其中部分技术特征进行等同替换； 而这些修改或者替换， 并不使相应技术 方案的本质脱离本发明实施例技术方案的精神和范围。

Claims

权利 要求 书
1、 一种波分网络中建立路径的方法， 其特征在于， 包括：
源节点建立到宿节点的第一路径；
源节点接收来自第一路径的中间节点的失败信息 , 所述失败信息包括所述 中间节点的出链路的可用波长信息， 所述出链路与第一路径上所述中间节点的 上游链路不具有波长一致性；
源节点根据所述中间节点的出链路的可用波长信息计算到所述宿节点的第 二路径。
2、 根据权利要求 1所述的波分网络中建立路径的方法， 其特征在于， 所述 源节点根据所述中间节点的出链路的可用波长信息计算到所述宿节点的第二路 径具体包括：
源节点根据所述中间节点的出链路的可用波长信息选择源节点的出链路， 所述源节点的出链路和所述中间节点的出链路有一致波长；
根据所述源节点的出链路和所述一致波长计算到所述宿节点的第二路径。
3、 根据权利要求 1所述的波分网络中建立路径的方法， 其特征在于， 所述 源节点根据所述中间节点的出链路的可用波长信息计算到所述宿节点的第二路 径具体包括：
源节点根据所述中间节点的出链路的可用波长信息选择源节点的出链路， 所述源节点的出链路和所述中间节点的出链路有一致波长；
通知所述源节点的出链路下游节点根据所述一致波长建立到所述宿节点的 第二路径。
4、 根据权利要求 1所述的波分网络中建立路径的方法， 其特征在于， 源节 点建立到宿节点的第一路径， 包括：
所述源节点向所述第一路径中的中间节点下发建立路径信息， 以建立所述 第一路径。
5、 一种通信节点， 其特征在于， 包括： 建立模块， 用于建立到宿节点的第一路径；
接收模块， 用于接收到来自第一路径的中间节点的失败信息；
计算模块， 用于根据所述中间节点的出链路的可用波长信息计算到所述宿 节点的第二路径； 所述失败信息包括所述中间节点的出链路的可用波长信息， 所述出链路与第一路径上所述中间节点的上游链路不具有波长一致性。
6、 根据权利要求 5所述的通信节点， 其特征在于，
所述计算模块， 用于根据所述中间节点的出链路的可用波长信息选择源节 点的出链路， 所述源节点的出链路和所述中间节点的出链路有一致波长； 根据 所述源节点的出链路和所述一致波长计算到所述宿节点的第二路径。
7、 根据权利要求 5所述的通信节点， 其特征在于，
所述计算模块， 用于根据所述中间节点的出链路的可用波长信息选择源节 点的出链路， 所述源节点的出链路和所述中间节点的出链路有一致波长； 通知 所述源节点的出链路下游节点根据所述一致波长建立到所述宿节点的第二路 径。
8、 根据权利要求 5所述的通信节点， 其特征在于，
所述建立模块， 用于向所述第一路径中的中间节点下发建立路径信息， 以 建立所述第一路径。
9、 一种波分网络通信系统， 包括至少三个节点， 其应用于建立其中的源节 点与宿节点之间的路径， 其特征在于，
所述路径的源节点， 用于在建立到宿节点的第一路径时， 若接收到来自第 一路径的中间节点的失败信息， 则根据所述中间节点的出链路的可用波长信息 计算到所述宿节点的第二路径； 所述失败信息包括所述中间节点的出链路的可 用波长信息， 所述出链路与第一路径上所述中间节点的上游链路不具有波长一 致性；
所述第一路径的中间节点， 用于在检测到出链路与第一路径中的上游链路 不具有波长一致性时， 向所述源节点发送所述失败信息。
10、 根据权利要求 9所述的波分网络通信系统， 其特征在于， 所述源节点， 用于根据所述中间节点的出链路的可用波长信息选择源节点 的出链路， 所述源节点的出链路和所述中间节点的出链路有一致波长； 并根据 所述源节点的出链路和所述一致波长计算到所述宿节点的第二路径。
11、 根据权利要求 9所述的波分网络通信系统， 其特征在于，
所述源节点， 用于根据所述中间节点的出链路的可用波长信息选择源节点 的出链路， 所述源节点的出链路和所述中间节点的出链路有一致波长； 通知所 述源节点的出链路下游节点根据所述一致波长建立到所述宿节点的第二路径。
12、 根据权利要求 9所述的波分网络通信系统， 其特征在于，
所述通信系统中的节点， 还用于在收到建立路径的通知信息后， 确定到下 一节点的链路， 该链路的波长与上游链路具有波长一致性。
13、 根据权利要求 9所述的波分网络通信系统， 其特征在于，
所述源节点， 用于向所述第一路径中的中间节点下发建立路径信息， 以建 立所述第一路径。
PCT/CN2011/083006 2010-12-31 2011-11-26 波分网络中建立路径的方法、通信节点和通信系统 WO2012088978A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11853752.1A EP2648351A4 (en) 2010-12-31 2011-11-26 METHOD FOR PRODUCING A PATH IN A WAVELENGTH NETWORK NETWORK AND COMMUNICATION NODE AND COMMUNICATION SYSTEM

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201010624673.6 2010-12-31
CN 201010624673 CN102158300B (zh) 2010-12-31 2010-12-31 波分网络中建立路径的方法、通信节点和通信系统

Publications (1)

Publication Number Publication Date
WO2012088978A1 true WO2012088978A1 (zh) 2012-07-05

Family

ID=44439511

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2011/083006 WO2012088978A1 (zh) 2010-12-31 2011-11-26 波分网络中建立路径的方法、通信节点和通信系统

Country Status (3)

Country Link
EP (1) EP2648351A4 (zh)
CN (1) CN102158300B (zh)
WO (1) WO2012088978A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2953294A1 (en) * 2013-02-27 2015-12-09 Huawei Technologies Co., Ltd. Protection switching method, system, and node
CN110708254A (zh) * 2018-07-09 2020-01-17 华为技术有限公司 一种业务处理方法、控制设备及存储介质

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102158300B (zh) * 2010-12-31 2013-10-09 华为技术有限公司 波分网络中建立路径的方法、通信节点和通信系统
WO2013082778A1 (zh) * 2011-12-08 2013-06-13 华为技术有限公司 一种波长业务信息通告方法、设备及系统
EP3883197A4 (en) 2018-12-11 2022-01-05 Huawei Technologies Co., Ltd. PROCESS, NETWORK DEVICE AND SERVICE ROUTE ESTABLISHMENT SYSTEM

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7050718B2 (en) * 2001-07-26 2006-05-23 Victor John Rychlicki Method of establishing communications in an all optical wavelength division multiplexed network
CN1998172A (zh) * 2004-07-19 2007-07-11 英国电讯有限公司 波长选择
CN101662704A (zh) * 2008-08-26 2010-03-03 华为技术有限公司 获取光波长路径的方法、系统和节点设备
CN102158300A (zh) * 2010-12-31 2011-08-17 华为技术有限公司 波分网络中建立路径的方法、通信节点和通信系统

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040120705A1 (en) * 2002-12-18 2004-06-24 Robert Friskney Differentiated resilience in optical networks

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7050718B2 (en) * 2001-07-26 2006-05-23 Victor John Rychlicki Method of establishing communications in an all optical wavelength division multiplexed network
CN1998172A (zh) * 2004-07-19 2007-07-11 英国电讯有限公司 波长选择
CN101662704A (zh) * 2008-08-26 2010-03-03 华为技术有限公司 获取光波长路径的方法、系统和节点设备
CN102158300A (zh) * 2010-12-31 2011-08-17 华为技术有限公司 波分网络中建立路径的方法、通信节点和通信系统

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2953294A1 (en) * 2013-02-27 2015-12-09 Huawei Technologies Co., Ltd. Protection switching method, system, and node
EP2953294A4 (en) * 2013-02-27 2016-01-20 Huawei Tech Co Ltd METHOD, SYSTEM, AND NODE FOR PROTECTION SWITCHING
CN110708254A (zh) * 2018-07-09 2020-01-17 华为技术有限公司 一种业务处理方法、控制设备及存储介质
US11664890B2 (en) 2018-07-09 2023-05-30 Huawei Technologies Co., Ltd. Service processing method, control device, and storage medium

Also Published As

Publication number Publication date
CN102158300A (zh) 2011-08-17
EP2648351A1 (en) 2013-10-09
CN102158300B (zh) 2013-10-09
EP2648351A4 (en) 2014-01-01

Similar Documents

Publication Publication Date Title
EP1845656B1 (en) A method for implementing master and backup transmission path
EP1111860B1 (en) Automatic protection switching using link-level redundancy supporting multi-protocol label switching
US8588611B2 (en) Method for establishing an inter-domain path that satisfies wavelength continuity constraint
CN104205728B (zh) 用于面向连接的网络中的恢复的方法和设备
EP2666250B1 (en) Procedure and system for optical network survival against multiple failures
WO2010109802A1 (ja) 自律分散制御によるパス設定方法およびシステム並びに通信装置
JP4968117B2 (ja) 経路計算装置および経路計算システム
WO2012088967A1 (zh) 一种网络恢复方法和装置
WO2021083364A1 (zh) 一种路径保护方法和网络节点
JP2008199311A (ja) スイッチ装置およびパス監視設定方法
KR101254405B1 (ko) 분산 리소스 관리 시스템 및 분산 리소스 관리 방법
WO2012088978A1 (zh) 波分网络中建立路径的方法、通信节点和通信系统
US20160204976A1 (en) Identifying the absence and presence of a ring protection link owner node in an ethernet network
CN102480368B (zh) 一种聚合链路的保护方法及系统
JP4392386B2 (ja) リカバリ方法、ならびに、そのリカバリ方法を実行する発信者ノード装置、中継ノード装置、および、着信者ノード装置
US8165016B2 (en) Method and apparatus for setting communication paths in a network
JP5567213B2 (ja) 要求に応じてプロバイダネットワークを通る接続を復旧するための方法および装置
WO2016165061A1 (zh) 一种业务保护方法及装置
CN112803995B (zh) 资源共享方法、网络节点及相关设备
EP2704382B1 (en) Method for managing services in a generalized-multi-protocol label switching, GMPLS, controlled network
CN106464524B (zh) Ason的路由计算方法和装置
WO2018121485A1 (zh) 业务切换方法、装置及业务切换系统
CN113169939B (zh) 一种业务路径建立的方法、网络设备和系统
JP2008103893A (ja) 通信システムおよび故障復旧方法
JP5388079B2 (ja) バックアップラベルスイッチパスを確立する方法、デバイス、およびシステム

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11853752

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

REEP Request for entry into the european phase

Ref document number: 2011853752

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2011853752

Country of ref document: EP