WO2006022074A1 - 通信ネットワーク、通信装置、通信制御方法及び通信制御プログラム - Google Patents
通信ネットワーク、通信装置、通信制御方法及び通信制御プログラム Download PDFInfo
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- WO2006022074A1 WO2006022074A1 PCT/JP2005/011592 JP2005011592W WO2006022074A1 WO 2006022074 A1 WO2006022074 A1 WO 2006022074A1 JP 2005011592 W JP2005011592 W JP 2005011592W WO 2006022074 A1 WO2006022074 A1 WO 2006022074A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/24—Multipath
- H04L45/245—Link aggregation, e.g. trunking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate
Definitions
- the present invention relates to a communication apparatus and communication network, and a control method and control program therefor, and in particular, a network that automatically sets an association between a data link for transmitting data and a bundle link for advertising in the network. It relates to the automatic setting system and method.
- next-generation network devices configured with various technologies are used, such as a router that switches packets and an optical cross connect that switches wavelength paths.
- IETF Internet Engi neenng Task Force
- Multi GMPLs Generalized Multiprotocol
- TE links are used to reduce the advertising volume and improve scalability (scalability) of routing protocols, since multiple data links are bundled and treated as one TE link.
- IDs of adjacent nodes metrics for traffic engineering in path calculation, and Sha Red Risk Link Group (SRLG) are assigned to TE links.
- the adjacent node means an adjacent communication device among a plurality of communication devices constructing a communication network.
- the ID of the adjacent node means identification information provided for each communication device to identify a plurality of communication devices.
- SRLGs are used to identify links that can not be used simultaneously if a failure occurs. For example, a TE link made by bundling multiple links is installed in a pipeline embedded in the ground, and the same SRLG is assigned to TE links passing through the same pipeline. You can know the scope of the impact when it occurs. As a result, if you do not share the SRLG as a route for working and backup, if you select a route, Harm can prevent both the working and backup routes from being affected at the same time. This SRLG should be assigned a unique value in the network to identify the impact of each failure.
- a neighbor discovery start message is first transmitted to the neighbor node.
- the adjacency discovery start message includes a TE link ID indicating a ⁇ ⁇ ⁇ TE link that has determined the correspondence with the data link.
- This adjacent discovery start message establishes the TE link indicated in the message and discovers the port on the adjacent node side of the data link belonging to that TE link.
- the data link means a transmission path for exchanging data between communication devices included in the communication network.
- the adjacent node receiving this adjacency discovery start message returns an adjacency discovery start response message indicating that preparation for adjacency discovery is complete.
- the correspondence relationship between the TE link and the data link is set in advance, so the adjacency discovery start message is referred to by referring to the correspondence relationship.
- Send a test message to the data link that belongs to the TE link specified in The test message contains the port ID of the transmission source.
- the adjacency of the data link can be known at each end of the link. If the data link is disconnected or misconnected, the adjacent node can not receive the test message, so the test success message is not sent back. It is understood that there is an abnormality in the connection.
- the port ID means identification information for identifying the port provided in the device body.
- the correspondence between the TE link and the data link can be determined by confirming the connection of the data link on the basis of the correspondence between the TE link and the data link set in advance. Then, set metrics and SRLG for this decided TE link. Enables path setting using routing and signaling.
- Non-Patent Document 1 Link Management Protocol (LMP), IETF Internet Draft (draft-ietf-ccamp-10. txt), page 16, chapter 5, October 2003
- An object of the present invention is to provide a communication network or the like in which a correspondence between a TE link and a data link is automatically set using a message defined by a conventional LMP.
- Another object of the present invention is to provide a communication network or the like which can automatically set metric and SRLG values in consideration of information of the entire network.
- a communication network is a communication network constructed by mutually connecting a plurality of communication devices by a transmission path
- the communication device incorporated in the communication network includes a temporary bundle link creating unit, a data link adjacency finding unit, and a link creating unit.
- the temporary bundle link creating unit has a function of bundling a transmission path common to the attributes of the ports provided in the device body, and providing identification information to the bundled transmission path, and the data link adjacency finding unit It has a function of acquiring the identification information given to the other party communication device and the identification information given to the bundled transmission path of the other party communication device,
- the bundle link creating unit may include identification information of the other party communication device and the other party. Based on the identification information of the bundled transmission line of the communication device and the identification information of the transmission line created by the temporary bundle link creation means, and the transmission lines to which the identification information matches are taken as bundle links It is characterized by having a function to determine.
- the communication device used for the communication network of the present invention includes temporary bundle link creating means, data link adjacency finding means, and bundle link creating means, and communication for a communication system interconnected by a transmission path.
- the temporary bundle link creating unit has a function of bundling a transmission path common to the attributes of the ports provided in the device body, and providing identification information to the bundled transmission path, and the data link adjacency finding unit It has a function of acquiring the identification information given to the other party communication device and the identification information given to the bundled transmission path of the other party communication device,
- the bundle link creating means is based on the identification information of the counterpart communication device and the identification information of the bundled transmission path of the counterpart communication device, and the identification information of the transmission path created by the temporary bundle link creating means. / /, Characterized in that it has a function of determining transmission paths to which the identification information matches as a bundle link.
- a communication control method is a communication control method for controlling a plurality of communication devices mutually connected by a transmission path on a communication network
- the identification information based on the identification information of the other party communication device, the identification information of the bundled transmission line of the other party communication device, and the identification information of the transmission line created by the temporary link creation means for each of the communication devices. And the step of determining the transmission paths which agree with each other as bundle links.
- the communication control program according to the present invention is a communication control program for controlling a plurality of communication devices mutually connected by a transmission path on a communication network,
- a transmission path in which the attribute of the port provided in the device body is common A function of providing identification information to the bundled transmission line;
- the identification information based on the identification information of the other party communication device, the identification information of the bundled transmission line of the other party communication device, and the identification information of the transmission line created by the temporary link creation means for each of the communication devices. And causing the computer to execute the function of determining the transmission paths that agree with each other as bundle links.
- the temporary bundle link creating unit bundles transmission paths in which the attributes of the ports provided in the device body are common, and gives identification information to the bundled transmission paths.
- the data link adjacency finding means acquires the identification information given to the counterpart communication device and the identification information given to the bundled transmission path of the counterpart communication device.
- the bundle link creating means may identify the identification based on the identification information of the other party communication apparatus and the identification information of the transmission path bundled in the other party communication apparatus and the identification information of the transmission line created by the temporary bundle link creating means.
- the transmission paths where the information matches are probabilityed as bundle links.
- the correspondence between the data link created by the temporary link creation means and the bundle link can be used, so that the conventional LMP neighbor discovery message can be used. It can be used as it is.
- temporary bundle link creation means groups data links having the same characteristics
- bundle link means groups data links for which the identification information matches, so that the characteristics are the same and the adjacent nodes are the same. It becomes possible to set the data link to be one bundle link and set its correspondence automatically.
- the communication apparatus may be provided with link information providing means for notifying the information of the bundle link created by the bundle link creating means to the outside.
- the communication device includes: link information creating means for assigning a new link attribute to the bundle link based on the information of the bundle link provided by the link information providing means of the child device; Information on the bundle link is collected from the link information providing means, and the information is output to the link information creating means. And a link information collection and distribution unit for distributing the link attribute assigned by the link information generation unit to the child device.
- the link information collection and distribution means in the communication device as the parent device collects bundle link information through the link information provision means in the communication device as the child device. Subsequently, the link information creation means in the communication apparatus as the parent apparatus assigns a new link attribute to the bundle link based on the collected bundle link information of the entire network. After that, the link information collection and distribution means in the communication device as the parent device distributes the link information newly generated by the link information generation means to the communication device, and each communication device transmits the distributed link information to the bundle link.
- the communication device as the parent device can collect link information of the entire network, so it becomes possible to automatically set an SRLG which needs to set a unique value in the entire network.
- the transmission paths having common port attributes in the own communication device are bundled,
- the identification information is added to the bundled transmission line, and the identification information of the other party communication apparatus and the identification information of the bundled transmission line of the other party communication apparatus, and the identification information of the transmission line created by the temporary bundle link creating means. Based on this, the transmission paths to which the identification information matches are determined as bundle links, so that errors and man-hours in setting the correspondence between data links and bundle links can be reduced.
- the communication devices connected to each other can mutually use the formula punishment information given to the communication device and the identification information of the transmission path bundled with the communication device, the correspondence is made in advance. It is possible to use the message for neighbor discovery possessed by the conventional LMP communication device that needs to set the relationship, and maintain compatibility with LMP compatible communication devices.
- the link information creation means in the communication apparatus as the parent apparatus assigns a new link attribute to the bundle link based on the collected bundle link information of the entire network, thereby making the unique in the entire network. You need to set various values yourself Since dynamic setting can be performed, mistakes and man-hours in setting can be reduced.
- FIG. 1 is an overall configuration diagram showing a first embodiment of a communication network according to the present invention.
- SDH cross connects 31 to 34 and data links (transmission paths) 61 to 66,... For transmitting data while connecting between adjacent SDH cross connects 31 to 34, and SDH crosses A control network 5 connected to each of the connects 31 to 34 and used for transmission and reception of control data is provided.
- the data link indicates only the connection relationship between adjacent SDH cross-connects.
- the SDH cross connect corresponds to a communication device that constructs a communication network.
- FIG. 2 is a network configuration diagram showing the SDH cross connects 31 to 33 in FIG.
- the SDH cross connect 31 has a plurality of ports 71 to 76
- the SDH cross connect 32 has a plurality of ports 81 to 86
- the SDH cross connect 33 has a plurality of ports 91 to 96.
- SDH cross connect 32, 33f 3 ⁇ 4 [this data link 64 power S, port 85, 92f 3 ⁇ 4 data link 65 power S, port 86, 93f 3 ⁇ 4 data link 66 power S, Each is connected.
- the SDH cross connects 31 to 33 are connected to each other by a control network 5 through which a control protocol passes, separately from the data links 61 to 66 through which data passes.
- FIG. 3 is a functional block diagram showing the SDH cross connect 32 in FIG.
- FIG. 4 is a chart showing the memory contents of each database in FIG. The following description will be made based on these drawings. However, the other SDH cross connects 31, ... have the same configuration.
- the SDH cross connect 32 includes a link information processing apparatus 10 that operates under program control, a storage unit 20 that stores information related to the link, and a message for communicating with other nodes. And a transmitter / receiver 29.
- the storage device 20 includes a bundle link database 21, a temporary bundle link database 22, a port information database 23, a data link database 24, and a control channel database 25.
- the node means the communication device of the adjacent partner as described above.
- the bundle link database 21 includes the ID (link ID) of the bundled TE link, the ID (port ID) of the port included in the TE link, and the ID of the adjacent node. (Adjacent node ID) and the ID of the TE link at the adjacent node (adjacent link ID).
- the link ID is given to a bundled data link (transmission path) in which the attributes of the ports provided in the device body are common, and means identification information for identifying these data links.
- the port ID is given to individual ports to which the bundled data link is connected, and means identification information for identifying these ports.
- the adjacent node ID means identification information for identifying the SDH cross-connects, which is given to the counterpart SDH cross-connects (communication devices) mutually connected by the data link.
- the adjacent link ID is a bundle of data links in which the attribute of the port provided in the other SDH cross-connect is common, attached to the bundled data links, and means identification information for identifying those data links. Do.
- the temporary bundle link database 22 shows candidate bundle links before being determined as bundle links, and as shown in FIG. 4 [2], the IDs (provisional link IDs) of TE links to be bundled and It includes the ID of the port included in the TE link (port ID), the ID of the adjacent node (adjacent node ID), and the ID of the TE link at the adjacent node (adjacent link ID).
- the values of the adjacent node ID and the adjacent link ID are not set when the temporary bundle link database 22 is created, and these values are determined in the adjacency discovery and bundle link creation stage.
- the temporary link ID is assigned to a bundled data link (transmission path) in which the attributes of the port provided in the device body are common, and identification information for identifying these data links.
- the port ID corresponds to the port ID of the bundle link database 21.
- the adjacent node ID corresponds to the adjacent node ID of the bundle link database 21.
- the adjacent link ID corresponds to the adjacent link ID of the bundle link database 21.
- the port information database 23 stores, for each port, a band and a framing type as an attribute of the port.
- the port information database 23 is created in advance before the bundle link creating means 14 is executed by acquiring it from the force SDH cross connect input by the network administrator.
- the data link database 24 indicates information on data links that are physical connections, and includes adjacent node IDs and adjacent port IDs, as shown in FIG. 4 [4].
- the port HD corresponds to the port ID of the bundle link database 21.
- the adjacent node ID corresponds to the adjacent node ID of the bundle link database 21.
- the adjacent port ID corresponds to the adjacent port ID of the bundle link database 21.
- Control channel database 25 represents information on adjacent nodes connected by data links and control channels for communication using control network 5. As shown in FIG. 4 [5], the control channel database 25 includes, for each control channel ID, an adjacent node ID, an adjacent control channel ID, and an address for control channel. As shown in FIG. 4 [5], a plurality of control channel IDs can be assigned to one control channel address, or different control channel addresses can be used for each control channel ID.
- the information registered in the control channel database 25 may be registered in advance by a network administrator, or may be automatically discovered as shown in the background art.
- the link information processing apparatus 10 includes a data link adjacency finding unit 11, a running adjacent adjacency finding counter (hereinafter referred to as a counter) 12, a temporary bundle link unit 13, and a bundle link creating unit 14 And have.
- Data link adjacency finding means 11 transmits a message for adjacency detection from message transmitter / receiver 29 using the control channel registered in control channel database 25 and the other party connected to the control channel Obtain the adjacent node ID and adjacent port ID for the port provided in the SDH cross-connect.
- the acquired information is registered in the data link database 24 and the temporary bundle link database 22, and is used by the bundle link creating means 14 to determine whether or not the adjacent node ID is satisfied.
- Counter 12 is an end of message monitor by data link at the time of data link adjacency detection. In order to know the timing of completion, the number of adjacencies found in progress is counted from the adjacency discovery start and adjacency discovery end messages received from the data link adjacency finding means 11.
- the counter 12 has its counter value set to 0 at startup.
- the temporary bundle link creating unit 13 creates the bundle relationship between the TE link and the data link used by the data link adjacency finding unit 11 and the bundle link creating unit 14 using the port information database 23, and Data is registered in temporary bundle link database 22.
- the bundle link creating means 14 is a TE to which the data link belongs from the bundle relationship between the TE link and the data link registered in the temporary bundle link database 22 and the adjacent node obtained from the data link adjacency finding means 11. Determine the link.
- FIG. 5 is a flowchart showing the overall operation of the SDH cross connect 32 shown in FIG. Hereinafter, description will be made based on FIG. 2 to FIG.
- the temporary bundle link creating unit 13 refers to the port information registered in the port information database 23, and sets ports having the same registered information as one temporary TE link. Register in temporary bundle link database 22.
- the framing type of all ports is SDH
- the bandwidth of ports 81, 82, 84, 85 is 2.5 Gbps
- the bandwidth of ports 83, 86 is lOGbps
- a temporary TE link is created based on the information held in the own node.
- provisional link ID 42.
- a power with reference to a band and a framing type, and a switching capability indicating whether a unit to be switched is a wavelength or a time slot, a minimum switchable bandwidth, and the like may be included.
- step S 102 the SDH cross connect 32 performs data link adjacency detection by the data link adjacency finding unit 11 and TE link creation by the bundle link creation unit 14.
- the bundle link creating means 14 of the port belonging to the same temporary TE link Among them, as a result of data link adjacency detection, ports having the same ID information of adjacent SDH cross-connects are registered in the bundle link database 21 as the same TE link.
- step S103 the data link adjacency discovery and TE link creation in step S102 is repeated until the adjacency discovery for all the provisional TE links is completed.
- step S104 is performed.
- the determination as to whether the data link adjacency finding and TE link creation in step S102 and the adjacency finding for all temporary TE links in step S103 have been completed is repeated with all adjacent SDH cross-connects.
- FIGS. 6 and 7 are flowcharts showing procedures of data link adjacency detection and TE link creation in the SDH cross connects 32 and 31 shown in FIG. 2, respectively.
- 8 to 10 are charts showing the provisional bundle link database and bundle link database of the SDH cross connect 32, 31.
- FIG. The following description will be made based on FIGS. 2 to 10, focusing on these drawings.
- FIGS. 6 and 7 are details of the TE link creation operation between the adjacent SDH cross connect 32 and SDH cross connect 31 in step S 102 of FIG. 5.
- the temporary TE link ID created in step S101 and the port belonging to the temporary TE link are registered.
- the adjacent node ID and the link of the TE link at the adjacent node are performed before the data link adjacent discovery is performed.
- FIGS. 8 to 10 also show a database of the SDH cross connect 31 adjacent to the SDH cross connect 32.
- Ports 71, 72, 74, and 75 are bundled, and the bandwidth is the same at 2.5 Gbps, so they are bundled as temporary TE link 46, and ports 73 and 76 are bundled and registered as temporary TE link 47 because the bandwidth is the same at lOGbps. .
- the SDH cross connect 32 transmits the adjacency discovery start message representing the start of adjacency discovery of the data link using the control channel 51 in step S301 of FIG. Do.
- the temporary TE link 41 or 42 may be used as the temporary TE link targeted for data link adjacent discovery, but it is explained that the temporary TE link 41 is selected first.
- the destination of the data link adjacency discovery start message is one of the SDH cross-connects in the relationship between the SDH cross-connect 32 registered in the control channel database 24 and the adjacent node.
- SDH cross-connects 31 and 33 are adjacent nodes of SDH cross-connect 32 discovered in step S101, but SDH cross-connect 31 is first selected as the destination of the data link adjacency discovery message. .
- the SDH cross connect 31 adds 1 to the value of the counter 12 in step S402 when receiving the data link adjacency discovery start message in step S401 in FIG.
- the value of this counter is decremented by 1 when the adjacency detection end message of the data link is received, and the monitoring of the free port is continued while the value is not 0. In this way, even when the start of adjacency discovery is received from multiple adjacent nodes, it is possible to prevent the monitoring from being stopped by any adjacency discovery end message.
- step S403 monitoring of the free ports 71 to 76 is started.
- step S404 an adjacency discovery start response message is returned via the control channel 51.
- This Neighbor Discovery Start Response message indicates that preparation for data link neighbor discovery is complete.
- the adjacency discovery identifier is given for each tentative TE link that performs adjacency discovery of the data link, and this identifier can identify the adjacency finding of the data link for each tentative TE link. It can be executed simultaneously with creation.
- the SDH cross connect 32 When the SDH cross connect 32 receives the adjacency discovery start response message in step S302, it transmits a sequential test message over the data link to the ports included in the temporary TE link 41 in step S303.
- a test message is sent to port 81 over data link 61.
- Test messages are at both ends of the data link General examination is performed to obtain the ID of the node and port connected to the This test message contains the source port ID.
- the SDH cross connect 31 that is the test message receiving side receives the test message on the port 74 in step S405. Since the receiving side can know the adjacency of the test message receiving port from the transmission source node ID of the adjacency discovery start message and the provisional TE link ID, and the port ID in the test message, the data link database and the provisional in step S406. Update the adjacency information with the bundle link database.
- the SDH cross connect 31 transmits a test success message indicating that the test message has been successfully received.
- the SDH cross-connect 32 is waiting for the return of the test success message, and in step S 304, determines whether to receive or time out after a predetermined time has elapsed.
- the provisional TE link 41 of the SD H cross connect 32 since the ports 81 and 82 are addressed to the SDH cross connect 31 that sent the adjacency discovery start message, the test success message reply is received, but the ports 84 and 85 are received. Since it has not sent an adjacency discovery message, the test success message is not sent back and it times out.
- the SDH cross connect 32 confirms the end of the test message transmission for all the ports in the temporary TE link 41. Then, since the bundle link creation means 14 can determine that the port receiving the test success message is the same in the adjacent node, it registers that in the bundle link database 21 (FIG. 9 (d)). Already bundled When the same TE link is registered for the port attribute and the adjacent node in the database 21, the same link ID as that of the existing TE link can be given and registered as the same link. It is also possible to give a link ID different from the link and register it as another TE link.
- the SDH cross connect 32 transmits an adjacency discovery end message indicating an adjacency discovery end for the temporary TE link 41.
- the SDH cross-connect 31 receives this adjacency discovery end message in step S409, as a result of adjacency discovery in step S410, registers the ports whose adjacent nodes are the same to the bundle link database.
- step S411 a neighbor discovery end response message is sent.
- the adjacency discovery end response message indicates that the adjacency discovery is understood to be complete, and includes an adjacency discovery identifier.
- the SDH cross connect 32 receives this adjacency discovery end response message in step S309, it ends the adjacency discovery for the temporary TE link 41 and the bundle link creation procedure.
- the SDH cross connect 31 After transmitting the adjacency discovery end response message in step S411, the SDH cross connect 31 decreases the value of the counter 12 by 1 in step S412. In step S413, if the value of the counter 12 is 0, monitoring of all free ports in the SDH cross connect 31 is ended.
- the procedure of adjacency detection and bundle link creation is also performed on the ports 83 and 86 in the temporary TE link 42.
- the port 83 is connected to the SDH cross connect 31 and receives the test success message. Therefore, as shown in FIG. 10 (e), the port 83 is registered in the bundle link database 21 of the SDH cross connect 32. Be done. Since one port 86 is not connected to the SDH cross connect 31, a timeout occurs in step S 304 after the test message is sent, so that it is registered as a new temporary TE link 44 in the temporary link bundle database.
- adjacent TE link adjacency detection with respect to the SDH cross connect 31 is completed.
- the SDH cross connect 32 subsequently performs adjacency discovery on the SDH cross connect 33 which is the remaining adjacent node registered in the control channel database 25.
- the provisional TE link 43 and the ports 84 and 85 included in the provisional TE link 44 and the port 86 included in the provisional TE link 44 are registered in the bundle link database 21 as a TE link to receive a test success message for each test message. Do.
- the bundle link database 21 of the SDH cross connect 32 is shown in FIG. 10 (f) after the procedure of the adjacent discovery and bundle link creation for the SDH cross connect 33 is performed.
- TE link 43, 44 force Each adjacent node is registered as SDH cross connect 33!
- the relationship between the data link and the temporary TE link can be temporarily created by the temporary bundle link creating means 22 based on the port information in the own node. It is possible to create TE link while using the same message format as data link adjacency detection. This eliminates the need to manually set the bundle relationship between TE link and data link, thus reducing the setting error and shortening the setting time.
- FIG. 11 is a functional block diagram showing an SDH cross connection in the second embodiment of the communication network according to the present invention.
- a link information providing unit 16 in each of the SDH cross connects 31 ′ to 34 ′, a link information providing unit 16, a link information creation device 19, and a network are provided in each of the SDH cross connects 31 ′ to 34 ′.
- a bundle link database 211 is added in each of the SDH crossconnects 31 'to 34' have the link information creating device 19, one SDH crossconnect becomes the master (master device), and this master node automatically sets the link information. Run.
- the SDH cross-connects 31 ', 33', 34 ' are not shown because they may have the same configuration as the SDH cross-connect 32'. In this embodiment, as long as at least one SDH cross connect in the network has the configuration shown in FIG. 11, the remaining SDH cross connects may have the same configuration as in the first embodiment.
- the link information providing means 16 notifies the master node of the information registered in the bundle link database 21 via the message transmitter / receiver 29, and registers in the bundle link database 21 the link information to which the master node power is also assigned.
- the storage device 18 includes an in-network bundle link database 211.
- the in-network bundle link database 211 the information shown in FIG. 4 [1] is registered for each of the SDH cross-connects 31 'to 34' in the network.
- the link information creating device 19 includes a link information collecting and distributing unit 201 and a link information creating unit 202.
- the link information collection and distribution means 201 collects information registered in the bundle link database 21 from the SDH cross-connects 31 'to 34' as information to be used for creating link information. Information to be collected can include not only bundle links but also data link and port information.
- the link information creating means 202 calculates metrics and assigns SRLGs to each bundle link based on the information registered in the in-network bundle link database 211.
- FIG. 12 is a flow chart showing an operation of the SDH cross connect in FIG.
- a procedure of network automatic setting according to the present embodiment will be described with reference to FIG.
- each SDH cross connect 31 'to 34' creates the bundle link database 21 according to the procedure described in the first embodiment at steps S501 and S601.
- each SDH cross link is processed in steps S 502 and S 602.
- Nects 31 'to 34' transmit messages for link information collection and distribution means 201 to message cross-connects 31 'to 34' to find SDH cross-connects as master nodes for automatic setting through message transmitter / receiver 29. Do.
- This message contains the node ID of the node and the master priority.
- One of the SDH cross-connects 31 'to 34' with a high master priority is the master of network autoconfiguration in the network. Any of the pre-specified SDH cross-connects 31 'to 34' may play the role of the master without using the master priority.
- step S503 a method of notifying master node home information from each of the SDH cross-connects 31 ′ to 34 ′ in step S503 will be described next.
- the SDH cross connect 32 ' will be described below, but the other SDH cross connects 31', 33 ', 34' are the same.
- the SDH cross connect 32 ′ notifies the master node that the link information has been updated, using a trap of SNMP (Simple Network Management Protocol).
- the master node acquires link information from the SDH cross connect 32 '.
- this acquisition method there is a method in which link information is held as MIB in each of the SDH cross-connects 31 'to 34', and a master node collects link information using SNMP GET.
- the master node may display the link information acquired from the SDH cross connect 32 ′ on the display, and confirm whether or not the setting conforms to the request. By checking the information collected by the administrator, it is possible to prevent detection of illegally installed SDH cross connec- tors or to operate with unintended settings.
- step S 604 based on the link information of the entire network collected by the link information collection and distribution unit 201, the master node determines metric and SRLG values by the link information generation unit 202.
- the link information collection in this step S603 in order to acquire the adjacency relationship of each SDH cross connect 31 'to 34', it is necessary to finish the data link adjacency detection and TE link creation before step S603.
- a method of assigning metrics there is a method of giving inverse numbers of bands in link information collected from the SDH cross connects 31 ′ to 34 ′. As a result, it will be used preferentially from wide bandwidth links. Also, as another example of the method of assigning metrics, there is a method of setting the metrics of links connected to a certain node at a constant rate larger than that of surrounding links. Ru. This makes it possible to reduce the number of paths passing through this node.
- SRLG a unique value in the network is allocated as SRL G for each link. According to this method, when a failure occurs, the scope of influence is limited, so that a common SRLG is not included between the working path and the protection path. You can avoid setting up a path where both are affected by the failure.
- link information affected by the operation policy there are service information supported by the domain including the SDH cross connect 31 ′ to 34 ′, supported protocol, optional information of the protocol, and the like.
- Information related to these operation policies is set in advance in the master node if it has a common value within the range managed by the master node, such as service information supported by the supported protocol and domain.
- the link attributes determined at the master node are distributed to the SDH cross-connects 31 'to 34'.
- This distribution method can be realized by changing the link information managed by each SDH cross connect 31 'to 34' as a MIB from the SNMP SET interface.
- step S 504 the link information of the SDH cross connects 31 ′ to 34 ′ is updated by the SET of SNMP from the master node.
- the SDH cross-connects 31 'to 34' have a flag indicating the end of setting of the master node's one for each link information, and in step S504, when the setting from the automatic setting server 1 is completed, the flag is ended.
- step S505 the link information that has been set is set using a routing protocol such as OSPF. Be advertised.
- any one of SDH cross-connects 31 'to 34' in the network is the master, and link information is collected from each SDH cross-connect 31 'to 34', and information on the entire network is collected. Based on the value assignment. Therefore, it becomes possible to automatically set information such as information that takes unique values in networks that could not be set conventionally, and values such as metrics that take into account the network topology.
- FIG. 1 is an overall configuration diagram showing a first embodiment of a communication network according to the present invention.
- FIG. 2 A network configuration diagram showing an SDH cross connect in FIG.
- FIG. 3 is a functional block diagram showing an SDH cross connect in FIG.
- FIG. 4 A chart showing the memory contents of each database in Fig. 3.
- Fig. 4 [1] is an example of bundle link database
- Fig. 4 [2] is an example of temporary bundle link database
- Fig. 4 [3] is port.
- Fig. 4 [4] is an example of the data link database
- Fig. 4 [5] is an example of the control channel database.
- FIG. 5 A flowchart showing the overall operation of the SDH cross connect in FIG.
- FIG. 6 A flowchart showing a data link adjacency detection and TE link creation procedure of the SDH cross connect in FIG. 1 (part 1).
- FIG. 7 A flowchart (part 2) showing the procedure of data link adjacency detection and TE link creation of the SDH cross connect in FIG.
- FIG. 8 A diagram showing a provisional bundle link database and bundle link database of the SDH cross connect in FIG. 1 (part 1).
- FIG. 9 A diagram (part 2) showing the provisional bundle link database and bundle link database of the SDH cross connect in FIG.
- FIG. 10 A diagram (part 3) showing the provisional bundle link database and bundle link database of the SDH cross connect in FIG.
- FIG. 11 is a functional block diagram showing an SDH cross connect in a second embodiment of the communication network according to the present invention.
- FIG. 12 is a flowchart showing an operation of the SDH cross connect in FIG.
- Running neighbor finding counter (running neighbor finding counting means)
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JP2006531314A JPWO2006022074A1 (ja) | 2004-08-23 | 2005-06-24 | 通信ネットワーク、通信装置、通信制御方法及び通信制御プログラム |
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Cited By (3)
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JP2008060869A (ja) * | 2006-08-31 | 2008-03-13 | Nippon Telegr & Teleph Corp <Ntt> | ノード装置およびその設定内容管理方法、そのプログラム、ならびに、光ip網システムおよびその設定内容管理方法 |
JP2008099294A (ja) * | 2006-10-16 | 2008-04-24 | Fujitsu Ltd | 複数制御チャネルをサポートするシステム及び方法 |
JP2010239547A (ja) * | 2009-03-31 | 2010-10-21 | Nippon Telegr & Teleph Corp <Ntt> | ネットワーク情報設定方法、ノード装置、プログラムおよびネットワーク情報設定システム |
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US8050196B2 (en) * | 2009-07-09 | 2011-11-01 | Itt Manufacturing Enterprises, Inc. | Method and apparatus for controlling packet transmissions within wireless networks to enhance network formation |
EP2992632B1 (en) * | 2013-05-03 | 2020-01-01 | Telefonaktiebolaget LM Ericsson (publ) | Method and management node for deciding ports suitable to be communicatively connected to each other in a communications network |
US11863430B2 (en) * | 2022-02-18 | 2024-01-02 | At&T Intellectual Property I, L.P. | Dynamic shared risk link group (SRLG) compression |
CN117938863B (zh) * | 2024-03-21 | 2024-05-24 | 中国人民解放军国防科技大学 | 基于集群的联合仿真实现方法、系统、设备及存储介质 |
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