CN1859273A - Method for maintaining and controlling plane attainable information in automatic exchanging optical network - Google Patents
Method for maintaining and controlling plane attainable information in automatic exchanging optical network Download PDFInfo
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Abstract
The present invention provides maintenance control plane accessibility information method in automatic exchange optical network. It contains in current structure basic, increasing one control plane accessibility information data base and one adjacency relation detect subfunction module to each node route control module; using adjacency relation detect subfunction module real time detecting local node and adjacent nodes adjacency relation variation; and in detecting variation generation, updating adjacency relation list in local adjacency relational data base, diffusing transmitting changed Adjacency node listing, realizing all control node Adjacency relational data base updating; synchronizing Adjacency relational data base and recalculating accessibility relation between node according to updated Adjacency relational data base, using calculative result as route querying constraint condition. The present invention can avoid route miscount duo to control node or control channel gone wrong, raising connection establishment success ratio and shortening connection establishment time.
Description
Technical field:
The present invention relates to the ASON (ASON:Automatic SwitchedOptical Network) in the communication technical field, the routing iinformation diffusion and the dynamic routing that are specifically related to are wherein calculated.
Background technology:
ASON is a kind of new technology that development is come out on the basis of traditional optical transfer network.The ASON network can be set up the optical channel that meets user's request according to a series of routes that self was equipped with, signaling, the running of protocol such as discovery automatically by user's request under the condition that does not need artificial management and control.This unprecedented revolutionary advancement is that optical-fiber network has brought qualitative leap.
Three planes are arranged in the ASON network architecture, and they are respectively to transmit plane, control plane and management plane.Transmit the plane and be made up of a series of transmission entity, it provides the professional actual physics passage that transmits.Control plane is the control core of ASON network, and it is made up of the Control on Communication passage between a series of Control Node and the Control Node.Control Node is responsible for finishing the controlled function to transmission node, for example configuration of transmission node interleave matrix etc.For in the control that does not have correctly to realize under the condition of human intervention to transmission node, need between the Control Node by dynamic exchanging routing information of Control on Communication passage and signaling control information.
ITU (International Telecommunications Union) has described the architectural framework of ASON network in its suggestion G.8080, this also is at present by the ASON framework of extensive employing.Wherein as described below about the basic procedure of dynamic routing calculating and routing iinformation diffusion function:
Routing module control is responsible for finishing the maintenance and the route computing function of network topological information.The routing module control of each Control Node is all safeguarded the database of an overall situation, this database description whole ASON network transmit the topological resource on plane, comprise the utilization of resources state of transmission node and the transmission link between them.When Control Node receives connection that webmaster or user send when setting up request, the network topology database that routing module control is safeguarded according to it, calculate one and satisfy showing paths of flow parameter and various constraintss, offer link control module.Link control module shows paths according to this and connects.When the topology resource information that transmits the plane changes, transmission node need be given corresponding Control Node with this feedback information, Control Node spreads this information to propagation again in the The whole control plane, can both in time obtain up-to-date transmission flat topology information with the routing module control that guarantees each Control Node.
A defective---routing calculation module is not safeguarded the reachability information of Control Node in the control plane for ASON network dynamic routing calculating described above and the existence of routing iinformation flooding mechanism.When the Control on Communication passage between Control Node itself or the Control Node breaks down, for passing through malfunctioning node in the path that new connection is calculated, because the transmission plane resource of malfunctioning node correspondence can not Be Controlled, cause and successfully to connect.Below we in conjunction with the accompanying drawings 1 and accompanying drawing 2, provide two examples:
Example 1. Control Node break down
As shown in Figure 1, A, B, C, D, E, F, G are seven ASON transmission nodes, and their Control Node is respectively a, b, c, d, e, f, g, and dotted line is the control channel between the Control Node among the figure.According to current ASON control plane architecture, the routing module control of each node is all preserved the topology information that network transmits the plane, but does not have the reachability information of Control Node in the control plane.Suppose that Control Node c breaks down suddenly, the pairing transmission flat topology of C point information still is retained in the topological database of a, b, d, e, f, g.In this case, if the A node attempts to be established to the connection that D is ordered, the routing module control of Control Node a is A-according to the path that transmission flat topology information calculations goes out〉B-〉C-〉D.But because Control Node c breaks down, it can't finish the controlled function to transmission node C, so this paths is actually passless, and correct path should be A-〉G-〉F-〉E-〉D.
Example 2. control channels break down
As shown in Figure 2, between Control Node b and the c and the control channel between c and the d break down, cause the c node control plane become an isolated island and can't with other node communications.If do not safeguard the reachability information of control plane, then the routing module control of a node calculates path or A-from A to D according to the topology resource information that transmits the plane〉B-〉C-〉D.Because Control Node b can't communicate by letter with c, so this is an invalid path, correct path should be A-〉G-〉F-〉E-〉D.
Summary of the invention:
The technical problem to be solved in the present invention is, propose a kind of method of in the ASON network, safeguarding the control plane reachability information, solve the problem of the invalid route result of calculation that causes because Control Node or control channel break down in the current general ASON architecture.
The method that the present invention takes is:
Routing module control to each node, on existing architecture basics, increase a control plane reachability information database and a syntople detection sub-function module, the former is used to preserve the reachability information of control plane, and the latter is used for the variation of syntople between adjacent two nodes of real-time detection network;
Detect the variation that sub-function module detects local node and adjacent node syntople in real time with described syntople, and change when taking place to the syntople in the local adjacency relational database tabulation and upgrade detecting;
The adjacent node tabulation diffusion in network that has changed is propagated, realize the renewal of all Control Node syntople databases of the whole network;
The syntople database is carried out synchronously and according to the syntople database after the renewal accessibility relation between the node being recomputated, with the constraints of result calculated as routing inquiry.
The function of routing calculation module in the present general ASON architecture that the method for safeguarding the control plane reachability information described in the invention is perfect, avoided the route mistake in computation of breaking down and causing, improved when Control Node or control channel break down, to connect the success rate of creating and shorten and connect creation-time because of Control Node or control channel.
Description of drawings:
Fig. 1 be in the prior art in the ASON architectural framework Control Node fault cause an example schematic diagram of invalid route result of calculation;
Fig. 2 be in the prior art in the ASON architectural framework control channel fault cause a schematic diagram of invalid route result of calculation;
The structured flowchart of the routing module control that the expansion that Fig. 3 the inventive method adopts is later;
Fig. 4 is the process chart of node maintenance control plane reachability information described in the invention.
Embodiment:
Before execution mode is described, at first define some terms of using herein:
Can reach:, then claim these two nodes can reach mutually if two Control Node can be passed through the correct transmitting control information of signaling network.Accessibility between the node has transitivity, if promptly A can reach to B, and B can reach to C, and A must reach to C so.
Syntople: if between two adjacent Control Node can by signaling network correct carry out information interaction, claim that then two nodes are adjacency each other, have set up syntople between them.A node may be set up syntople with zero, one or more node.Obviously, set up between two nodes of the relation that is right after and to have reached mutually.
Adjacent node tabulation: for some Control Node, its adjacent node list records the set of having set up the node of syntople with this node.
The syntople database: in order to safeguard ASON network control plane reachability information, each node in the network is all safeguarded the syntople database of the whole network.Write down the syntople between all Control Node in this database, can calculate between any two Control Node according to this database and whether can reach.
Be described in further detail below in conjunction with the enforcement of accompanying drawing 3, accompanying drawing 4 and ospf protocol technical scheme.OSPF (open approach is the shortest preferential) agreement is present most widely used Routing Protocol.
1, in order to safeguard ASON network control plane reachability information, the present invention expands accordingly to the 26S Proteasome Structure and Function of route control module, and the expansion way of escape by the structural representation of control module as shown in Figure 3.Compare with traditional structure, increased a control plane reachability information database among Fig. 3 newly, be used for preserving the reachability information of control plane.In order to obtain the reachability information of control plane, need the variation of syntople between adjacent two nodes in the real-time detection network, this function can realize by increase a syntople detection sub-function module in routing module control, also can realize that by other modules outside the routing module control with dashed lines is represented the syntople detection module among Fig. 3.
2, detect the variation of local node and adjacent node syntople in real time
Local Control Node periodically sends probe data packet to the every other Control Node adjacent with it, if in official hour, can receive the response that the other side is correct, think that then local node and neighbor node set up syntople, otherwise think that the syntople that local node does not have and neighbor node is set up syntople or set up is destroyed.
If local node and adjacent node syntople change, the syntople information of detected variation is installed in the syntople database that this node safeguards, cover the old adjacent node tabulation of this node, and carry out next step, the diffusion of the syntople information that has been about to change in network propagated; Otherwise, do not cause subsequent action.
For the system that adopts the OSPF Routing Protocol, can adopt protocol hello mechanism among the OSPF to safeguard syntople between the adjacent node, basic operation is as follows:
The node of each operation ospf protocol all periodically outwards sends the Hello packet from all of the port, also receives the Hello packet that other nodes send to this node simultaneously.Include a node listing in each Hello packet, listed the node identification of source node that other nodes that the sending node of Hello packet receives in nearest a period of time send to the Hello packet of this node.
The process of setting up syntople in the network between adjacent two nodes is as follows: if a certain moment node A has received the Hello packet that Node B is sent, illustrate that then the B node is unimpeded to the one-way communication of A node.Next whether its node identification of A node inspection is present in the node listing of this Hello packet, if the B node sends to the node identification that includes A in the Hello packet of A, then illustrate the B node in a period of time recently once the A node that receives of success send to its Hello packet, this shows that the two-way communication of A to B and B to A all is unimpeded.Like this, the foundation that node A and Node B are just successful syntople.
Successfully setting up two node A of syntople and B can be periodically send the Hello packet to the other side mutually and keeps syntople between them.If A does not receive the Hello packet that the B node sends in certain time interval, or the node identification of A no longer comes across in the node listing of Hello packet that B sends to it, this explanation communication from A to B or from B to A takes place unusual, and the syntople that A just detects it and B is disconnected.
3, the diffusion of the syntople information that has changed in network propagated
By certain mechanism (for example flooding mechanism of the Link State Advertisement packet of OSPF Routing Protocol) the syntople diffusion of information that node has changed is propagated into the whole network.Make all Control Node all obtain this information, and utilize this information to upgrade their syntople database.
When the syntople that detects it and another Node B as certain the node A in the network changed (comprising the foundation of syntople and the disconnection of syntople), it need notify this information the every other node in the network.For the system that adopts the OSPF Routing Protocol, the flooding mechanism of Link State Advertisement (the LSA:Link State Advertisement) packet that this process can be by OSPF is finished.The flooding mechanism that how to utilize ospf protocol is described below spreads the syntople information of propagating the ASON Control Node:
The syntople state that some node S detect it and other nodes in the network changes, so it will initiate the diffusion communication process of new syntople information.S is the source node of initiating this process, and its handling process and every other node are different, the description of therefore below branch being come.
(1) handling process of source node
Source node at first will and upgrade the own syntople database of being safeguarded according to the adjacent node tabulation of this node of modifications of its own detected syntople, he also needs the syntople information package after upgrading then, and sends to every other adjacent node.So-called packing is meant the adjacent node list information of this node at current time is encapsulated in the defined Link State Advertisement packet of ospf protocol here.RFC2328 has defined five kinds of the most basic Link State Advertisement data packet formats of ospf protocol, and they all have specific separately purposes.RFC2370 expands RFC2328, has defined a kind of application Link State Advertisement type of data packet very flexibly---opaque Link State Advertisement bag (Opaque LSA).Opaque LSA has the heading of a set form, and application layer message arbitrarily can be followed in the back.Therefore, the system for adopting the OSPF Routing Protocol can be encapsulated into the syntople list information of node current time in the message body of Opaque LSA very easily, then this Opaque LSA is sent to all adjacent nodes.
(2) handling process of other nodes
Other nodes receive after the Opaque LSA update package that adjacent node sends in the network, at first carry out a series of validation verification of ospf protocol defined, and the packet by checking will directly not be dropped.For those LSA packets, will further handle by checking.Handle and carry out in two steps:
(2.1) the syntople information after from the message body of Opaque LSA, take out upgrading, and the syntople database of safeguarding according to this this node of information updating.
(2.2) the Opaque LSA packet " relay " that receives is propagated into the neighbor node of this node.This step can be handled according to the normal process of ospf protocol, does not need to make any modification.
4, the recomputating of accessibility relation synchronously and between the node of syntople database
Through previous action, the syntople database of each Control Node has been realized synchronously in the network.Each node calculates can arrive which Control Node from a certain Control Node according to the syntople database after upgrading, and the constraints of this information as routing inquiry, require the path that routing module control calculated not only enough resources to be arranged, and also must reach at control plane on the transmission plane.
When the syntople database that utilizes node to safeguard carries out the calculating of accessibility relation between node, among the present invention this problem is converted into " connectedness " computational problem of a figure:
The syntople database can be described with one " figure " on mathematics, and the Control Node in the ASON control plane, the syntople between " limit " representation node of figure are described in " summit " of figure.If " summit " A from figure, " summit " and " limit " through series arrived another " summit " B, can reach between Control Node A and the B so, and this is " connectedness " problem of a figure on mathematics.If this " figure " is " full-mesh ", then all can reach between any two Control Node in the control plane.Otherwise, can calculate this figure " connected component "---just the figure of " non-full-mesh " is split into several parts, wherein each part itself all is " subgraph " of " full-mesh ", but is inaccessible mutually between the node of any two subgraphs.
If there is mutual inaccessible node in control plane, can calculate by figure " connectedness " Control Node in the control plane is split into several subnets, wherein can reach mutually between the Control Node of subnet inside, and the Control Node between the subnet is inaccessible.When routing module control receives routing inquiry request, must guarantee that not only there are enough resources in the path that it calculated on the transmission plane, and pairing Control Node must be positioned at a subnet scoping that can reach.
Claims (7)
1, safeguard the method for control plane reachability information in a kind of ASON, may further comprise the steps:
1.1 routing module control to each node, on existing architecture basics, increase a control plane reachability information database and a syntople detection sub-function module, the former is used to preserve the reachability information of control plane, and the latter is used for the variation of syntople between adjacent two nodes of real-time detection network;
1.2 detect the variation that sub-function module detects local node and adjacent node syntople in real time with described syntople, and change when taking place to the syntople in the local adjacency relational database tabulation and upgrade detecting;
1.3 the adjacent node that will change tabulation diffusion in network is propagated, and realizes the renewal of all Control Node syntople databases of the whole network;
1.4 the syntople database is carried out synchronously and according to the syntople database after the renewal accessibility relation between the node being recomputated, with the constraints of result calculated as routing inquiry.
2, safeguard the method for control plane reachability information in the described ASON of claim 1, it is characterized in that, the variation of described detection local node and adjacent node syntople, be that local node periodically sends probe data packet to its adjacent every other Control Node, judge according to the correct response that can receive the other side whether syntople variation has taken place.
3, safeguard the method for control plane reachability information in the described ASON of claim 2, it is characterized in that, local node periodically sends the Hello packet to its adjacent node, if can receive the node identification that indicates oneself in the node listing of packet that certain adjacent node sends to the Hello packet of this node and this reception, then two nodes have been set up syntople, otherwise the syntople of two nodes is disconnected.
4, safeguard the method for control plane reachability information in the described ASON of claim 1, it is characterized in that, described adjacent node tabulation diffusion in network that will change is propagated, and the renewal that realizes all Control Node syntople databases of the whole network is to realize by the flooding mechanism of the Link State Advertisement packet of OSPF.
5, safeguard the method for control plane reachability information in the described ASON of claim 4, it is characterized in that, detect the node that the syntople state of itself and other node changes in the network, at first according to the adjacent node tabulation of this node of modifications of its own detected syntople and upgrade the own syntople database of being safeguarded, the syntople information package after will upgrading then sends to every other adjacent node; After other nodes in the network are received this update package, verify earlier, can not be by directly abandoning of verifying, by what verify, syntople information after take out upgrading from bag and the syntople database of safeguarding according to this this node of information updating send to the packet that receives the neighbor node of this node then.
6, safeguard the method for control plane reachability information in the described ASON of claim 5, it is characterized in that described packing is meant the adjacent node list information of this node at current time is encapsulated among the defined Link State Advertisement packet of the ospf protocol Opaque LSA.
7, safeguard the method for control plane reachability information in the described ASON of claim 1, it is characterized in that, computational methods to accessibility relation between the node are: represent Control Node with " summit ", with the syntople between " limit " representation node; If from one " summit ", through " summit " and " limit ", can arrive another " summit ", can reach between these two nodes so; Unreachable as if existing between two or more nodes, then the Control Node in the control plane is split into several subnets, wherein can reach mutually between the Control Node of subnet inside, and the Control Node between the subnet is inaccessible.
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| WO2008138250A1 (en) * | 2007-05-09 | 2008-11-20 | Huawei Technologies Co., Ltd. | Resource state monitoring method, device and communication network |
| CN101895474A (en) * | 2010-07-29 | 2010-11-24 | 江苏大学 | Information diffusion-based P2P network route control method |
| CN101483548B (en) * | 2009-02-26 | 2011-01-19 | 中国人民解放军信息工程大学 | Method and system for distance vector routing protocol self-recovery |
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| US7339889B2 (en) * | 2002-06-20 | 2008-03-04 | Nortel Networks Limited | Control plane architecture for automatically switched optical network |
| CN1312863C (en) * | 2002-07-11 | 2007-04-25 | 北京邮电大学 | Recoverable path selectino set-up method of automatic exchanging optical network |
| CN1202638C (en) * | 2003-01-16 | 2005-05-18 | 上海交通大学 | Method for delivering link state information to pass through network |
| ATE291310T1 (en) * | 2003-03-24 | 2005-04-15 | Cit Alcatel | OSPF MONITORS AND MONITORING PROCEDURES |
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| US8014300B2 (en) | 2007-05-09 | 2011-09-06 | Huawei Technologies Co., Ltd. | Resource state monitoring method, device and communication network |
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| WO2008138250A1 (en) * | 2007-05-09 | 2008-11-20 | Huawei Technologies Co., Ltd. | Resource state monitoring method, device and communication network |
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| WO2011047581A1 (en) * | 2009-10-22 | 2011-04-28 | 中兴通讯股份有限公司 | Method and system for discovering ring network protection information |
| CN101895474A (en) * | 2010-07-29 | 2010-11-24 | 江苏大学 | Information diffusion-based P2P network route control method |
| CN101895474B (en) * | 2010-07-29 | 2012-12-19 | 江苏大学 | Information diffusion-based P2P network route control method |
| WO2011157111A3 (en) * | 2011-05-30 | 2012-05-03 | 华为技术有限公司 | Method, node and system for determining fault indication state |
| US9471408B2 (en) | 2011-05-30 | 2016-10-18 | Huawei Technologies Co., Ltd. | Method, node and system for determining fault indication state |
| CN106131919A (en) * | 2016-07-15 | 2016-11-16 | 中国电子科技集团公司第五十四研究所 | A kind of synchronous method of non-stop layer self-organized network topology |
| CN106131919B (en) * | 2016-07-15 | 2019-06-11 | 中国电子科技集团公司第五十四研究所 | A kind of synchronous method of non-stop layer self-organized network topology |
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