CN101841466A - Optical network routing method based on diffusion of information - Google Patents
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Abstract
The invention relates to a routing method based on diffusion of information in a wavelength routing optical network. The method is realized on a wavelength routing optical network control plane server and comprises the following steps: during the network initialization stage, each node diffuses signal strength information to the adjacent nodes; after receiving the strength information, the adjacent nodes diffuse the information to the neighboring nodes, and signal strength is attenuated during diffusion process. The signal strength of another node received by one node is the maximal value of the signal strength received by all the ports of the node. When signal strength received by one port of the node is less than the maximal value at a moment, the diffusion in the path stops. After the network is stabilized, the route direction to one node is the gradient direction of signal strength diffusion. When one link is occupied or out of order, the nodes at the two ends of the lick diffuse the 'link unavailable' information to the adjacent nodes. After receiving the information, the adjacent nodes modify the local routing database and selectively and continuously diffuse the information to the neighboring nodes according to demands.
Description
Technical field
The invention belongs to technical field of optical network communication, especially refer to the method for routing in a kind of wavelength route optical network, be used to reduce the complexity that the network route is calculated, and higher network topology confidentiality is provided, have control plane convergence and bandwidth consumption preferably simultaneously.
Background technology
At present the network route technology mainly is divided into two kinds of Link State route and distance vector routes.Wherein, be that the Link State route of representative floods the neighbor information of node and informs the all-network node with OSPF.After information from flooding convergence, each network node is safeguarded the LSD that the whole network is unified, and based on this database by shortest path by its routing table of algorithm computation.This route technology has convergence and bandwidth consumption preferably, is widely used in the Internet network.In order to support the wavelength route optical network based on GMPLS, ospf protocol is expanded and is OSPF-TE, and has been applied in the ASON.Yet also there are some open defects in the Link State route, and for example route computation complexity height especially for the optical-fiber network of supporting wavelength conversion, is non-polynomial computation time complexity, and this badly influences the expansion of network size.In addition, because the route of Link State route is calculated the link-state information that relies on whole network, its topological confidentiality is very low, particularly for the extensive multiple domain optical-fiber network by institute of a plurality of operator managed together, this routing mode is difficult to take into account simultaneously the optimization of route calculating and the privacy of topology information.
By contrast, be that the whole network routing iinformation that the distance vector route of representative is grasped each node is informed neighbor node with RIP, after network information convergence, the network route can directly obtain by the inquiry local data base, and need not to carry out complicated calculating, the time complexity of calculating is very low.Simultaneously, because each node only carries out information interaction with neighbor node, and need not to know the topological sum link-state information of whole network, the distance vector route can provide higher topological confidentiality.Yet, be that the information interaction convergence rate of distance vector route technology of representative is low with RIP, even may produce the route ring, thereby seriously limited the expansion of network size.In addition, because RIP route technology periodicity and the mutual routing iinformation of neighbor node, its control plane bandwidth consumption is very big.Just because of there being the problems referred to above, the progress of distance vector route technology in optical-fiber network is comparatively slow.
No matter can see, in current network, be that Link State route or distance vector route all exist some defectives.Still there is not a kind of route technology can solve these defectives simultaneously.
Summary of the invention
According to an aspect of the present invention, provide a kind of optical network routing method, it is characterized in that comprising based on diffusion of information:
On the control plane server of wavelength route optical network, in the netinit stage, make each optical network node comprise the good news of its signal strength information respectively to its neighbor node diffusion on each wavelength plane, described each optical network node is the signal source node
On the control plane server of wavelength route optical network, make described neighbor node after receiving these strength informations, continue the signal strength signal intensity of described strength information to be decayed the neighbor node diffusion to described neighbor node of described strength information in the process of the described diffusion of each jumping on same wavelength plane;
On the control plane server of wavelength route optical network, get whole ports of a node received from the maximum of the described signal strength signal intensity of a described signal source node signal strength signal intensity as a described received described signal source node of node.
According to a further aspect of the present invention, said method further comprises:
The described signal strength signal intensity of the described signal source node that receives when the some ports in described whole ports of a described node stops the diffusion of described good news during less than described maximum.
According to a further aspect of the present invention, said method further comprises:
When the Network request arrives, the route to a destination node is defined as along the route of the gradient direction of the described signal strength signal intensity of this destination node,
Starting a connection management module finishes along the foundation of the described route of described gradient direction.
According to a further aspect of the present invention, said method further comprises:
When the foundation owing to described route causes some link occupied and/or when link failure takes place in the network, spread the disabled bad news of described link from the node of described both link ends to neighbor node,
Make described neighbor node after receiving these message, carry out the modification of the database of described neighbor node, and will comprise the route entry of disabled described link and corresponding described strength information deletion thereof.
According to a further aspect of the present invention, said method further comprises:
After described modification at the local data base of a node of described wavelength route optical network, when the described signal strength signal intensity of certain described signal source node that described local data base is safeguarded changes, described bad news is continued diffusion to the neighbor node of a described node;
When the request of removing a network route arrives a described node, start described connection management module and carry out the dismounting of described network route, and discharge occupied link circuit resource;
After described link circuit resource is released, described network route the node of process comprise the good news of the described signal strength signal intensity of all described signal source nodes to the diffusion of the neighbor node of this node, above-mentioned neighbor node repeats this and comprises the process of the good news of described signal strength signal intensity to neighbor node diffusion after receiving described good news, stable up to network state.
According to a further aspect of the present invention, in said method, the node and the port information of its process carried in the diffusion of good news, realizes showing route.
According to a further aspect of the present invention, in said method, described connection management module adopts two-way resource reservation and/or unidirectional resource reservation setting up of described route in the process; Finish in the process of foundation of described route starting described connection management module, when the link circuit resource conflict has taken place at certain intermediate node, reselect to the route of described destination node from other ports of this intermediate node, to finish the foundation of described route.
According to a further aspect of the present invention, in said method, for optical network node with wavelength conversion ability, spread described good news on the wavelength plane that can carry out wavelength conversion to neighbor node, wherein except that carrying out above-mentioned signal intensity attenuation, also added and striden the pairing signal intensity attenuation of wavelength plane operations.
According to a further aspect of the present invention, in said method, in the optical-fiber network of multirouting territory, make the boundary node of node by described territory in the routed domain in described a plurality of routed domain spread its described strength information, thereby realize optimum cross-domain Route Selection to other described routed domain.
According to a further aspect of the present invention, in said method, trigger-type is adopted in the diffusion of described good news and/or described bad news, promptly when node receives a message, immediately it is handled and as required described message is continued to diffuse to the neighbor node of this node.
Description of drawings
Fig. 1 is the diffusion of information and the Route Selection schematic diagram of the optical network routing method based on diffusion of information according to an embodiment of the invention, and wherein Fig. 1 (a) has shown initialization procedure, and Fig. 1 (b) has shown the bad news processing procedure.
Fig. 2 is the diffusion of information schematic diagram with optical network node of wavelength conversion ability according to an embodiment of the invention.
Fig. 3 is a network congestion rate curve according to an embodiment of the invention.
Fig. 4 be according to one embodiment of present invention with the control plane bandwidth consumption comparison diagram of prior art.
Fig. 5 for according to one embodiment of present invention with the road construction of prior art/tear open road after the network convergence time comparison diagram.
Fig. 6 is an initialization flowchart according to an embodiment of the invention.
Fig. 7 is good news according to an embodiment of the invention/bad news process chart.
Fig. 8 is road construction according to an embodiment of the invention/tear open a road process chart.
Embodiment
In order to reduce the complexity that the network route is calculated, and provide higher network topology confidentiality, have control plane convergence and lower bandwidth consumption preferably simultaneously, the present invention proposes in a kind of optical-fiber network method for routing (following also be referred to as " IDBR method " based on diffusion of information, that is: InformationDiffusion Based Routing), it can be on the basis that keeps distance vector route advantage, in control plane convergence and bandwidth consumption, meet or exceed the technical merit of OSPF-TE, implementation prospect is widely arranged.
This method realizes on the control plane server of wavelength route optical network according to the following steps:
In the netinit stage, each optical network node comprises the good news of its signal strength information respectively to its neighbor node diffusion on each wavelength plane, neighbor node continues these information are spread to its neighbor node on same wavelength plane after receiving these strength informations, and signal strength signal intensity is jumped in diffusion process at each and decayed; The signal strength signal intensity of another node that node is received receives the maximum of this node signal intensity for its each port, if the signal strength signal intensity of this node that certain constantly receives from certain port is less than this maximum, then this road diffusion stops, when all diffusions stopped, network state was stable;
When the Network request arrived, the route that arrives destination node was the gradient direction route along this destination node diffusion signal intensity, starts the foundation that the connection management module is finished this route;
When since route set up when causing in the occupied or network of some link link failure taking place, the node of these both link ends is to the disabled bad news of its neighbor node diffusion link, neighbor node is after receiving these message, revise local data base, to comprise the route entry of this unavailable link and corresponding node signal strength information deletion thereof, if behind database update, the signal strength signal intensity of certain node that it is safeguarded changes, and then this bad news is continued diffusion to its neighbor node;
When the request of removing of network route arrives, start the connection management module and carry out the route dismounting, and discharge occupied link circuit resource; After these link circuit resources are released, route the node of process comprise the good news of its signal strength information to the diffusion of its neighbor node, neighbor node repeats this process after receiving these good news, stablize up to network state.
The node and the port information of its process carried in the diffusion of good news, realizes showing route.
Undertaken in the process of road construction by showing route in the connection management module, if at certain intermediate node the link circuit resource conflict has taken place, the route that can reselect to destination node from other ports of this node is finished road construction.
The connection management module both can adopt two-way resource reservation in the road construction process, also can adopt unidirectional resource reservation.
For optical network node with wavelength conversion ability, good news except that on this wavelength plane to neighbor node diffusion, also need stride the wavelength plane, spread to neighbor node on the wavelength plane that can carry out wavelength conversion, except that carrying out the normal signal strength retrogression, also need add and stride wavelength planed signal strength retrogression in the diffusion.
For the multiple domain optical-fiber network, the territory interior nodes can spread its signal strength information to other routed domain by boundary node, thereby realizes optimum cross-domain Route Selection.
Trigger-type is adopted in the diffusion of all message, promptly when node receives a message, immediately it is handled and as required it is continued to diffuse to neighbor node.
The diffusion of information of the optical network routing method based on diffusion of information according to an embodiment of the invention and Route Selection are as shown in Figure 1.Wherein Fig. 1 (a) is the netinit process, and Fig. 1 (b) is a network bad news processing procedure.Information source is node S among Fig. 1, and the signal strength signal intensity of the node S that each network node is received is represented with graphics mode in the node circle, also expresses the received signal strength signal intensity of each port with digital form simultaneously.In addition, the thickness of link line style has reflected the strength information in the signal diffusion process, and line style slightly be by force, a little less than line style carefully is.In this example, signal intensity attenuation factor alpha=1/2 of good news diffusion, promptly every the jumping through one spread, and signal strength signal intensity reduces half.Can see, occupied when a link that links to each other with node A, through after the message diffusion, from the route of this node-to-node S change has taken place.
The diffusion of information of the optical network node with wavelength conversion ability according to an embodiment of the invention as shown in Figure 2.Three meshed networks among Fig. 2 have disposed two wavelength, and node A is wavelength conversion node (WIXC).At node A, message diffusion can be striden the wavelength plane and carried out, introducing to stride wavelength planed signal strength retrogression coefficient be 1/2
n
One routine blocking rate simulation result as shown in Figure 3.This emulation is based upon on the NSFNET topology (14 nodes, 21 two-way links, 8 wavelength), and the business load intensity interval is set to 2.5-5Erlang (Ireland), and the network blocking probability of corresponding 5 wavelength conversion nodes is 7e-3-0.17.
One routine simulation result of control plane bandwidth consumption as shown in Figure 4.Can see that along with the increase of wavelength conversion number of nodes and the reduction of business load intensity the control plane bandwidth consumption of the optical network routing method based on diffusion of information of the present invention increases.Compare OSPF-TE, diffusion of information route (IDBR) can obtain lower bandwidth consumption when network is not supported wavelength conversion.
The routine simulation result of network convergence time behind road construction/tear open the road as shown in Figure 5.Can see the increase along with the wavelength conversion number of nodes, the road construction convergence time of the optical network routing method based on diffusion of information of the present invention increases, and tears the road convergence time open and changes little.No matter be road construction or tear the road open, the convergence time of diffusion of information route all with OSPF-TE on same level.
Fig. 6 is the netinit embodiment flow chart of the optical network routing method based on diffusion of information according to an embodiment of the invention, and as shown in the figure, the entire flow of present embodiment may further comprise the steps:
At first, carry out initialized node N to its all neighbor nodes at all wavelengths plane λ
kSend its initial signal intensity I, enter idle condition afterwards, the arrival of the bag that waits for the arrival of news.
After node N receives a message bag, put it into the Message Processing formation.
System reads a pending message from message queue, its type is classified, and start corresponding Message Processing flow process:
(1) if what receive is the good news flood message, then starts good news handling process (Fig. 7);
(2) if what receive is the bad news flood message, then start bad news handling process (Fig. 7);
(3) if what receive is road construction request message bag, then start road construction handling process (Fig. 8);
(4), then start and tear road handling process (Fig. 8) open if what receive is to tear road request message bag open;
(5), adopt other message processing modules to handle for other situations.
After a Message Processing finished, if the message queue non-NULL, system read the pending message of next bar, and repeated above-mentioned Message Processing flow process, and when message queue was sky, system reentered idle condition, the arrival of the bag that waits for the arrival of news.
Fig. 7 is the good news/bad news Processing Example flow chart of the optical network routing method based on diffusion of information according to an embodiment of the invention, and as shown in Figure 7, the entire flow of good news may further comprise the steps:
At first, local node N extracts the message diffuse information that good news comprised: message source-S, wavelength-λ
k, route-p, signal strength signal intensity-i.
Next, node N reads the wavelength plane λ of local maintenance
kThe signal strength data storehouse of last node S.
If α is j＞signal strength signal intensity of the node S of the port label of reception message, and then this signal strength signal intensity of mark is α j again, and its route of mark is p.Wherein, α is the signal intensity attenuation coefficient.Otherwise the Message Processing flow process finishes.
If α is j＞signal strength signal intensity of the node S of all of the port mark, and then with wavelength plane λ
kNode S signal strength signal intensity be labeled as α j, and this good news is continued at wavelength plane λ
kOn be diffused into all neighbor nodes of node N, signal strength signal intensity is α j, route is p ∪ N, the signal strength signal intensity of sending the port label node S of this message is 0.Otherwise the Message Processing flow process finishes.
If node N is wavelength conversion node (WIXC), and the signal strength signal intensity of α j＞every other wavelength plane node S, then this good news is diffused to the neighbor node on these wavelength planes, signal strength signal intensity is α
*J.Wherein, α
*For striding wavelength planed signal strength retrogression coefficient.Otherwise the Message Processing flow process finishes.
The entire flow of bad news may further comprise the steps:
At first, local node N extracts the message diffuse information that bad news comprised: message source-S, wavelength-λ
k, take/faulty link l.
Next, node N reads the wavelength plane λ of local maintenance
kThe signal strength data storehouse of last node S.And will wherein comprise the signal strength signal intensity zero clearing of the node S of the route entry of l and port label thereof.
If wavelength plane λ
kThe signal strength signal intensity of last node S changes (new signal strength signal intensity is i ', and route is p '), then this bad news is continued at wavelength plane λ
kOn be diffused into node N promising bad news come the neighbor node of source node.Otherwise the Message Processing flow process finishes.
The diffusion good news is to wavelength plane λ
kAll neighbor nodes of last node N, signal strength signal intensity are α j, and route is p ' ∪ N.
If node N is wavelength conversion node (WIXC), and wavelength plane λ
kThe original signal intensity i of last node S then is diffused into this bad news the neighbor node of other non-informed sources in wavelength plane in all wavelengths plane maximum.
If node N is wavelength conversion node (WIXC), and wavelength plane λ
kThe new signal intensity of last node S is 0, then obtains this intensity and routing iinformation from the wavelength plane that has node S maximum signal.Otherwise the Message Processing flow process finishes.
Fig. 8 is the road construction of the optical network routing method based on diffusion of information according to an embodiment of the invention/tear road Processing Example flow chart open, and as shown in the figure, the entire flow of road construction may further comprise the steps:
At first, local node N extracts the information that the road construction request message is comprised: destination node-D.
Next, node N seeks the strongest route p of node D signal strength signal intensity on local all wavelengths plane, and corresponding wavelength plane is w.
Start the connection management module and carry out road construction.
If road construction success, then for each bar link l of p, to the neighbours of its two end node on the w of wavelength plane, for the occupied bad news of all message sources diffusion l.Otherwise report an error, the Message Processing flow process finishes.
The entire flow of tearing the road open may further comprise the steps:
At first, local node N extracts and tears the information that the road request message is comprised: service numbers-T open.
Next, start the connection management module T is torn open the road.
If tear road success open, then for each node k of the route of professional T, to its neighbor node on the w of wavelength plane, for the occupied bad news of all message sources diffusion l.Otherwise report an error, the Message Processing flow process finishes.
Should be understood that, in above narration and explanation to just explanation but not determinate of description that the present invention carried out, and do not breaking away under the prerequisite of the present invention that limits as appended claims, can carry out various changes, distortion and/or correction the foregoing description.
Claims (10)
1. optical network routing method based on diffusion of information is characterized in that comprising:
On the control plane server of wavelength route optical network, in the netinit stage, make each optical network node comprise the good news of its signal strength information respectively to its neighbor node diffusion on each wavelength plane, described each optical network node is the signal source node
On the control plane server of wavelength route optical network, make described neighbor node after receiving these strength informations, continue the signal strength signal intensity of described strength information to be decayed the neighbor node diffusion to described neighbor node of described strength information in the process of the described diffusion of each jumping on same wavelength plane;
On the control plane server of wavelength route optical network, get whole ports of a node received from the maximum of the described signal strength signal intensity of a described signal source node signal strength signal intensity as a described received described signal source node of node.
2. method according to claim 1 is characterized in that further comprising:
The described signal strength signal intensity of the described signal source node that receives when the some ports in described whole ports of a described node stops the diffusion of described good news during less than described maximum.
3. method according to claim 2 is characterized in that further comprising:
When the Network request arrives, the route to a destination node is defined as along the route of the gradient direction of the described signal strength signal intensity of this destination node,
Starting a connection management module finishes along the foundation of the described route of described gradient direction.
4. method according to claim 3 is characterized in that further comprising:
When the foundation owing to described route causes some link occupied and/or when link failure takes place in the network, spread the disabled bad news of described link from the node of described both link ends to neighbor node,
Make described neighbor node after receiving these message, carry out the modification of the database of described neighbor node, and will comprise the route entry of disabled described link and corresponding described strength information deletion thereof.
5. method according to claim 4 is characterized in that further comprising:
After described modification at the local data base of a node of described wavelength route optical network, when the described signal strength signal intensity of certain described signal source node that described local data base is safeguarded changes, described bad news is continued diffusion to the neighbor node of a described node;
When the request of removing a network route arrives a described node, start described connection management module and carry out the dismounting of described network route, and discharge occupied link circuit resource;
After described link circuit resource is released, described network route the node of process comprise the good news of the described signal strength signal intensity of all described signal source nodes to the diffusion of the neighbor node of this node, above-mentioned neighbor node repeats this and comprises the process of the good news of described signal strength signal intensity to neighbor node diffusion after receiving described good news, stable up to network state.
As described in the claim 3 based on the optical network routing method of diffusion of information, it is characterized in that the node and the port information of its process carried in the diffusion of good news, realize showing route.
7. as method as described in the claim 3, it is characterized in that,
Described connection management module adopts two-way resource reservation and/or unidirectional resource reservation setting up of described route in the process;
Finish in the process of foundation of described route starting described connection management module, when the link circuit resource conflict has taken place at certain intermediate node, reselect to the route of described destination node from other ports of this intermediate node, to finish the foundation of described route.
As described in the claim 3 based on the optical network routing method of diffusion of information, it is characterized in that:
For optical network node with wavelength conversion ability, spread described good news on the wavelength plane that can carry out wavelength conversion to neighbor node, wherein except that carrying out above-mentioned signal intensity attenuation, also added and striden the pairing signal intensity attenuation of wavelength plane operations.
9. as any one the described method among the claim 1-8, it is characterized in that,
In the optical-fiber network of multirouting territory, make the boundary node of node by described territory in the routed domain in described a plurality of routed domain spread its described strength information, thereby realize optimum cross-domain Route Selection to other described routed domain.
10. as each described method among the claim 1-8, it is characterized in that, trigger-type is adopted in the diffusion of described good news and/or described bad news, promptly when node receives a message, immediately it is handled and as required described message is continued to diffuse to the neighbor node of this node.
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| WO2019056916A1 (en) * | 2017-09-21 | 2019-03-28 | 烽火通信科技股份有限公司 | Method for calculating allocation of relay resources in optical transmission network planning |
| CN111698116A (en) * | 2020-04-01 | 2020-09-22 | 新华三技术有限公司 | Resource release method, device, equipment and machine readable storage medium |
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| CN1610324A (en) * | 2003-10-22 | 2005-04-27 | 三星电子株式会社 | Network apparatus and method for stable handoff |
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| CN1610324A (en) * | 2003-10-22 | 2005-04-27 | 三星电子株式会社 | Network apparatus and method for stable handoff |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2019056916A1 (en) * | 2017-09-21 | 2019-03-28 | 烽火通信科技股份有限公司 | Method for calculating allocation of relay resources in optical transmission network planning |
| CN111698116A (en) * | 2020-04-01 | 2020-09-22 | 新华三技术有限公司 | Resource release method, device, equipment and machine readable storage medium |
| CN111698116B (en) * | 2020-04-01 | 2022-10-21 | 新华三技术有限公司 | Resource release method, device, equipment and machine readable storage medium |
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