CN100393054C - System for implementing elastic permanent virtual connection and its method - Google Patents
System for implementing elastic permanent virtual connection and its method Download PDFInfo
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- CN100393054C CN100393054C CNB021366489A CN02136648A CN100393054C CN 100393054 C CN100393054 C CN 100393054C CN B021366489 A CNB021366489 A CN B021366489A CN 02136648 A CN02136648 A CN 02136648A CN 100393054 C CN100393054 C CN 100393054C
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Abstract
The present invention discloses a system and a method for realizing elastic permanent virtual connection. The system comprises a data mapping module, an elastic PVC module, a signalling module and a routing module which are connected in turn, the data mapping module receives user's data mapping and initiates a connection creating request; the elastic PVC module integrates the functions of a starting end node and a terminal node; the signalling module is used for executing standard signaling process of a broadband network according to the connection creating request of the elastic PVC module; the routing module is used for searching outlet routes according to an ATM address of a called terminal. The method primarily comprises the following steps: the values of a starting end VPI, VCI and a terminal end VPI, VCI are loaded in an information unit of broadband high layer or broadband low layer; the values are pellucidly transmitted through a center node; accordingly, the elastic permanent virtual connection is established. By adopting the present invention, the connected starting end can realize automatic protection of failure retry process, the data flow automatic protection during permanent faults of a physical link can be realized, and logistic multicast can be realized.
Description
Technical field
The present invention relates to the system and method for the elastic permanent virtual connections of realization in a kind of data communication field.
Background technology
Permanent virtual connects (PVC) and exchanges virtual connections (SVC) is that two kinds of ATM switch are connected the mode of foundation substantially.VPI (virtual path identifier), VCI (Virtual channe identifiers) sign that permanent virtual connects directly disposes appointment by network management system, and exchange virtual connections VPI, VCI identify by standard signaling procedure dynamic assignment.PVC does not need the user side equipment support, is convenient to user's admittance, but the configuration underaction; SVC can pass through signalling interactive process, realizes dynamic allocation of resources and release, but needs the support of subscriber terminal equipment.Elastic permanent virtual connections (Stretchy PVC) is that a kind of mixing connects the mode of setting up, only have permanent virtual with clearing end and is connected (PVC) characteristic connecting the initiating terminal of setting up, and mode is set up in the connection that has exchange virtual connections (SVC) characteristic on the connection interlude.Thereby elasticity PVC mode combines the two advantage of PVC and SVC, both has been convenient to user admission, is convenient to configuration again and realizes dynamic allocation of resources and release.
At present, the soft pvc process in the PNNI1.0 agreement in the atm forum can realize the similar function of elastic permanent virtual connections.But realize that VPI, VCI value are consulted end to end owing in SETUP (foundation), ADDPARTY (increase website) message, use Calling party soft PVPC or PVCC information unit and Called party softPVPC or PVCC information unit in the soft pvc agreement, and these two information units are a kind of special information units in the PNNI1.0 agreement, in other signaling protocol standards, do not have this two information units.Therefore this method can not be used carrying out in the atm network of intercommunication with other procotols, wants to realize elastic permanent virtual connections by the signaling protocol process, must seek a kind of new method.
Multicast and broadcasting are communication modes commonly used in the atm network in addition.A general syndeton to multiple spot of using realizes multicast and broadcasting in atm network.Point is divided into space multicast and two kinds of forms of logical multicast to the syndeton of multiple spot.The space multicast is meant that the point that occurs on a plurality of different physics mouths is to multiple spot; Logical multicast is meant that the point that occurs on the physics mouth is to multiple spot.The space multicast can make up the network of different topology type, and logical multicast can remedy the deficiency of space multicast to the requirement of physics mouth number.Space multicast and logical multicast combine, and can realize various types of broadbands multicast and multicast service.
If will realize logical multicast by signaling procedure, in the time of must sending ADDPARTY message at the node of occurrence logic multicast, distribute the resource of setting up logical multicast, when user response ADD PARTYACK message, set up physical connection.But owing to do not have VPI, VCI sign in the ADD PARTY message that the network side signaling entity sends, even therefore the network equipment can provide the logical multicast passage, this passage can't be known and use to the user still.
Summary of the invention
One of technical problem that the present invention solves provides a kind of system that realizes elastic permanent virtual connections, has permanent virtual at the initiating terminal and the clearing end of system and is connected (PVC) characteristic, and have exchange virtual connections (SVC) characteristic on the connection interlude.
Two of the technical problem that the present invention solves is that proposition is a kind of in the ATM switching network, the method for the elastic permanent virtual connections of realization of compatible other signaling protocols.
The present invention realizes that the system of elastic permanent virtual connections comprises data configuration module, elasticity PVC module, signalling module and the routing module that links to each other successively;
The data configuration module is used for the receiving subscriber data configuration, and initiates to connect request to create by elasticity PVC module to signalling module;
The function of elasticity PVC module is integrated top node and terminal node; The connection request to create that the top node module is used for that the data configuration module is sent is converted into standard signaling messages and sends to signalling module, and initiates reconstruction automatically after connecting establishment initial period or link appearance alarm; The terminal node module is used for the user side function of operative norm signaling;
Signalling module is used for creating message according to the connection of elasticity PVC module, the broadband network signaling procedure of operative norm, the connection of creating point-to-point or putting multiple spot;
Routing module is used for seeking route according to the called end atm address, and whether identify port is elastic permanent virtual connections type port, and can automatically switch to route stand-by after alarm appears in link.
The method of the elastic permanent virtual connections of realization that the present invention proposes is as follows:
The first step, the data configuration module receives the order of setting up elasticity PVC that network management system is sent; Obtain the protocol type that connects, connection type, top VPI, VCI value, terminal VPI, VCI value, purpose atm address, and flow parameter, number of retries etc.;
Second step, in top elasticity PVC module, top VPI, VCI value and terminal VPI, VCI value be loaded into carry by the establishment connection message and by the user terminal explanation, and intermediate node by the information unit of transparent transmission in;
In the 3rd step, signalling module extracts the PVC endpoint parameter at top, and sends the pathfinding request to routing module;
In the 4th step, routing module is searched route according to the purpose atm address that signalling module provides, and whether identify port be elastic permanent virtual connections type port; If the routing module response is common SVC route-type, at this moment the SVC process of signalling module operative norm; If what routing module was responded is elasticity PVC route-type, then signalling module extracts VPI, the VCI value of terminal, and sends the establishment connection request to the elasticity PVC of terminal module;
In the 5th step, signalling module is received after the establishment response message of terminal elasticity PVC module response, utilizes the PVC endpoint parameter of extracting to set up physical connection;
In the 6th step, when elasticity PVC module receives that message is set up in connection, respond connection to the data configuration module and set up the result, again by data configuration module notice NMS user; Connect when setting up failed message if elasticity PVC module is received, can initiate reconstruction automatically, just set up the result above the reconstruction number of times of configuration to data configuration module response connection until creating successfully or create number of times according to the reconstruction number of times that disposes.
Not only end-to-end PVC can be realized by the present invention, and protection automatically can be realized by failure retry procedure at connection top:
When connecting link and of short duration fault occurs, can rebuild automatically to make to connect and return to normal condition;
When the physical link permanent fault, can enable route stand-by and realize the automatic protection of data flow.
Elastic permanent virtual connections two ends also can be simultaneously on a network node, and this connection can be regarded as has the PVC that connects defencive function.
The logical multicast of realizing among the present invention is chosen on the fringe node of far-end and takes place, and therefore also has the advantage of the bandwidth of saving backbone network, VPI, VCI resource.
The present invention has made full use of limited Internet resources, and networking flexibility, reliable is suitable for constructing various types of atm networks.
Description of drawings
Fig. 1 is the system works schematic diagram of the elastic permanent virtual connections of realization of the present invention.
Fig. 2 is broadband high layer information of the present invention unit (Broad High Layer Information) structural representation.
Fig. 3 is that the present invention works as elastic permanent virtual connections link connection reconstruction process schematic diagram when of short duration fault occurring.
Fig. 4 is the present invention's message interaction process schematic diagram when utilizing the multicast of signaling procedure control logic to take place.
Fig. 5 is that the present invention is by disposing the scene schematic diagram of control logic multicast.
Fig. 6 is that the elastic permanent virtual connections of the present invention utilizes the route stand-by mechanism of route system to realize the schematic diagram of protection automatically.
Embodiment:
The elastic permanent virtual connections (Stretchy PVC) that the present invention proposes is that a kind of mixing connects the mode of setting up, it is a kind of by the realization of standard signaling protocol process, only have permanent virtual with clearing end and is connected (PVC) characteristic connecting the initiating terminal of setting up, and mode is set up in the connection that has exchange virtual connections (SVC) characteristic on the connection interlude.This connection is set up mode and is equivalent to PVC for terminal equipment, is convenient to user's admittance; But for the network intermediate node is SVC, can pass through signalling interactive process, realizes dynamic allocation of resources and release.
In the serial protocols standard of the serial protocols standard of UNI and NNI, be used for creating the SETUP of connection, some information unit that ADD PARTY message is carried is made an explanation by user terminal, there are broadband high layer information unit (Broad High LayerInformation) and broadband low layer information unit (Broad Low Layer Information) etc. in these unit of intermediate node transparent transmission, these message elements.Therefore can be on the switch of the originating end that connects, adopt these message elements to load VPI, the VCI value of setting up the required terminal node of elastic permanent virtual connections, when terminaling exchange is received the message of creating connection, from corresponding information unit, take out VPI, VCI value again, and utilize this VPI, VCI to identify and set up a point-to-point connection or put multiple spot connection (comprising space multicast and logical multicast).
The present invention adopts the UNI serial protocols and is used for the broadband high layer information unit (Broad High Layer Information) of the IISP protocol specification of NNI interface as end points connection identifier load bearing unit, this information unit structure as shown in Figure 2, below in conjunction with the concrete enforcement of description of drawings the inventive method and system.
The system of the elasticity PVC that the present invention realizes is made up of following four parts: the data configuration module, and elasticity PVC module, signalling module, routing module (referring to accompanying drawing 1), it can be realized in the following manner:
One, data configuration module performing step:
1. receive the manmachine command that network management system is set up elasticity PVC: comprise protocol type, connection type, top VPI, VCI value, terminal VPI, VCI value, purpose atm address, and flow parameter, number of retries etc.;
2. initiate to create the request of elasticity PVC to elasticity PVC module.
Two, the performing step of elasticity PVC module
This module has comprised the function of top node and terminal node.
The performing step of top node is:
1. receive the connection request to create of data configuration module, according to different connection types, make up corresponding SETUP or ADDPARTY standard signaling primitive, and fill in broadband high layer information unit (Broad High Layer Information) like this: the length of in the information unit length field of broadband high layer information unit, filling this information unit content; Fill 000 0001 expression user definitions in broadband high layer information cell type field (High Layer Information Type), the use of this encoded point represents that the particular content in the broadband high layer information unit depends on terminal use's negotiation; In the broadband high layer information extended byte, fill Calling Side VPI, VCI sign and callee side VPI, VCI sign.
2. when elasticity PVC module receives that CONNECT or ADDPARTY ACK message are set up in connection, respond connection to the data configuration module and set up the result, notify NMS user by the latter again;
3. if elasticity PVC module is received to be connected when setting up failed message, can initiate reconstruction automatically, just set up the result above the reconstruction number of times of configuration to data configuration module response connection until creating successfully or create number of times according to the reconstruction number of times that disposes.
In addition, by accompanying drawing 3 as seen, after connection was built up, when line failure, the two-layer protocol SSCOP of signaling can be to signaling three layer protocol entities report fault, and signaling three layer protocol entities can connect demolishing process to top, the starting terminal of elasticity PVC.When the top node is received connection fault tear down message, can start process of reconstruction, thereby realize the automatic protection of connection.Terminal node is realized by the signalling interactive process of standard.
Three, the performing step of signalling module
1. when signalling module is received the establishment message of top elasticity PVC module transmission, from broadband high layer information unit High Layer Information respective byte, extract the PVC endpoint parameter at top, and send the pathfinding request to routing module;
2. if routing module responds is common SVC route-type, this moment the signalling module operative norm the SVC process; If what routing module was responded is elasticity PVC route-type, then take out VPI, the VCI of terminal in the broadband high layer information unit High Layer Information respective byte of signalling module from create message, and send create primitive to the elasticity PVC of terminal process.
3. receive after the establishment response message of terminal elasticity PVC module response, utilize the PVC endpoint parameter of taking out to set up physical connection.When receiving CONNECT message, set up point-to-point connection or space multicast as requested and connect; When receiving ADDPARTY ACK message, set up physical connection, just on the called end switch logical multicast has taken place at this moment.
By accompanying drawing 4 as seen,, in the time of must sending ADD PARTY message at the node of occurrence logic multicast, distribute the resource of setting up logical multicast, when user response ADD PARTY ACK message, set up physical connection if will realize logical multicast by signaling procedure.But can not carry VPI, VCI sign Connection Identifier message elements owing to do not resemble in the ADD PARTY message that the network side signaling entity sends to have the SETUP message, even therefore the network equipment can provide the logical multicast passage, this passage can't be known and use to the user still.By method described in the invention and signaling procedure control, just can on network node, be provided as the real logical multicast passage as can be known of user, so this is a kind of a kind of new method that realizes logical multicast on wide-band exchange unit.And by accompanying drawing 5 as seen, can be configured to the terminal node of SPVC, thereby the flexible generation of control logic multicast by scene with logical multicast.
Four, the performing step of routing module
1. the purpose atm address that provides according to signalling module is searched route, and whether identify port be elastic permanent virtual connections type port.When adopting dynamic routing mechanism, routing table can be upgraded automatically according to network topology structure; When adopting static routing mechanism, can pass through data configuration module manual configuration route;
2. return route searching result to signalling module.
Accompanying drawing 6 is depicted as the elastic permanent virtual connections of the present invention and utilizes the route stand-by mechanism of route system to realize the schematic diagram of protection automatically; route stand-by mechanism by route system realizes protection automatically; promptly when connection is broken down; routing module can automatically switch to route stand-by; when after elasticity PVC module receives to connect the fault tear down message, starting process of reconstruction like this; the route stand-by that can utilize route system to return is rebuild a new connection, has just realized the automatic protection of data flow.
Claims (6)
1. a system that realizes elastic permanent virtual connections is characterized in that, described system comprises data configuration module, elastic permanent virtual connections module, signalling module and the routing module that links to each other successively;
The data configuration module is used for the receiving subscriber data configuration, and initiates to connect request to create by elastic permanent virtual connections module to signalling module;
The function of elastic permanent virtual connections module is integrated top node and terminal node; The connection request to create that the top node module is used for that the data configuration module is sent is converted into standard signaling messages and sends to signalling module, and initiates reconstruction automatically after connecting establishment initial period or link appearance alarm; The terminal node module is used for the user side function of operative norm signaling;
Signalling module is used for creating message according to the connection of elastic permanent virtual connections module, the broadband network signaling procedure of operative norm, the connection of creating point-to-point or putting multiple spot;
Routing module is used for seeking route according to the called end atm address, and whether identify port is elastic permanent virtual connections type port, and can automatically switch to route stand-by after alarm appears in link.
2. method that realizes elastic permanent virtual connections, realize that the step of described method is:
The first step, the data configuration module receives the order of setting up elastic permanent virtual connections that network management system is sent; Obtain the protocol type that connects, connection type, top virtual path identifier, Virtual channe identifiers value, terminal virtual path identifier, Virtual channe identifiers value, purpose atm address, and flow parameter, number of retries;
Second step, in the elastic permanent virtual connections module in top, top virtual path identifier, Virtual channe identifiers value and terminal virtual path identifier, Virtual channe identifiers value be loaded into by creating that connection message carries and explain by user terminal, and intermediate node by the information unit of transparent transmission in;
In the 3rd step, signalling module extracts the permanent virtual connection end point parameter at top, and sends the pathfinding request to routing module;
In the 4th step, routing module is searched route according to the purpose atm address that signalling module provides, and whether identify port be elastic permanent virtual connections type port; If the routing module response is common exchange virtual connections route-type, at this moment the exchange virtual connections process of signalling module operative norm; If what routing module was responded is elastic permanent virtual connections route-type, then signalling module extracts virtual path identifier, the Virtual channe identifiers value of terminal, and sends the establishment connection request to the elastic permanent virtual connections module of terminal;
In the 5th step, signalling module is received after the establishment response message of the elastic permanent virtual connections module response of terminal, utilizes the permanent virtual connection end point parameter of extracting to set up physical connection;
In the 6th step, when elastic permanent virtual connections module receives that message is set up in connection, respond connection to the data configuration module and set up the result, again by data configuration module notice NMS user; Connect when setting up failed message if elastic permanent virtual connections module is received, can initiate reconstruction automatically, just set up the result above the reconstruction number of times of configuration to data configuration module response connection until creating successfully or create number of times according to the reconstruction number of times that disposes.
3. the method for the elastic permanent virtual connections of realization according to claim 2, it is characterized in that, top virtual path identifier, Virtual channe identifiers value and terminal virtual path identifier, Virtual channe identifiers value can be loaded in broadband high layer information unit or the broadband low layer information unit in the step 2.
4. according to the method for claim 2 or the elastic permanent virtual connections of 3 described realizations, it is characterized in that after connection was built up, when line failure, signalling module connected demolishing process to top, the starting terminal of elastic permanent virtual connections module; When the top node is received connection fault tear down message, start process of reconstruction, realize the automatic protection that connects.
5. according to the method for claim 2 or the elastic permanent virtual connections of 3 described realizations, it is characterized in that, terminal node is configured to the scene of logical multicast, set up the discernible logical multicast passage of user, realize logical multicast.
6. according to the method for claim 2 or the elastic permanent virtual connections of 3 described realizations; it is characterized in that; when connection is broken down; routing module automatically switches to route stand-by; when elastic permanent virtual connections module receives that connecting the fault tear down message starts process of reconstruction afterwards; the route stand-by that utilizes route system to return is rebuild a new connection, has realized the automatic protection of data flow.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1127286A (en) * | 1997-07-07 | 1999-01-29 | Nec Corp | Failure restoration method for atm exchanging device |
| KR20010008718A (en) * | 1999-07-02 | 2001-02-05 | 윤종용 | Permanent virtual connection establishment apparatus and method for base station controller in mobile communication system |
| KR20010075867A (en) * | 2000-01-21 | 2001-08-11 | 오길록 | Method of PVC control for frame relay interworking |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1127286A (en) * | 1997-07-07 | 1999-01-29 | Nec Corp | Failure restoration method for atm exchanging device |
| KR20010008718A (en) * | 1999-07-02 | 2001-02-05 | 윤종용 | Permanent virtual connection establishment apparatus and method for base station controller in mobile communication system |
| KR20010075867A (en) * | 2000-01-21 | 2001-08-11 | 오길록 | Method of PVC control for frame relay interworking |
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