CN101656898B - Path establishing method for multi-domain wavelength routing optical network - Google Patents
Path establishing method for multi-domain wavelength routing optical network Download PDFInfo
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- CN101656898B CN101656898B CN200910092658A CN200910092658A CN101656898B CN 101656898 B CN101656898 B CN 101656898B CN 200910092658 A CN200910092658 A CN 200910092658A CN 200910092658 A CN200910092658 A CN 200910092658A CN 101656898 B CN101656898 B CN 101656898B
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Abstract
The invention discloses a path establishing method for a multi-domain wavelength routing optical network, which belongs to the field of the wavelength routing optical network, is used for the establishment of a light path in the multi-domain optical network and can guarantee the safety and the high-efficiency in establishing the path. The method mainly comprises the following steps: a source node sends a connection establishing request to a network manager, the network manager judges whether a destination node is in home-domain, if so, the destination node is selected out according to a domain routing algorithm, the route to the destination node is calculated by the source node, and the light path from the source node to the destination node is established in accordance with a signaling protocol in order to complete the establishment of the light path from the source node to the destination node; otherwise, the source node in the domain where the network manager is present establishes the light path between exit nodes in home-domain and commands the exit nodes in home-domain to send the connection establishing request to the network manager in the next domain, and the exit nodes in home-domain are regarded as the corresponding source nodes and this procedure is repeated in the next domain until the light path is established eventually.
Description
Technical field:
The present invention relates to the wavelength route optical network field, more precisely relate to cross in the wavelength route optical network method for building up of the light path in a plurality of territories.
Background technology:
ASON (ASON) is the developing direction of next generation network, and WDM (wavelength division multiplexed network) is owing to have the application direction that bigger transmission bandwidth becomes the ASON core net.Owing to do not have strict difinition about the WDM standard specification, cause the implementation of the wdm system of different manufacturers to have nothing in common with each other, thereby the specification of equipment that adopt in various network supplier's territory is different, this sets up for the path of crossing over a plurality of territories and has brought inconvenience.For guaranteeing the fail safe of network, need the not topological sum resource information in the externally hiding own territory of supplier of same area in addition,, also do not have the ripe cross-domain light path method for building up of a cover at present in view of above reason.To this problem, this paper has proposed the path establishment method in a kind of multi-domain wavelength routing optical network.
In the method that this paper proposes; The path is set up and is controlled by management plane; Carry out the multiple domain Path selection by management plane, guaranteed the fail safe of path foundation and the high efficiency that inter-domain path is selected, but management plane is just selected this territory Egress node of the required process in path; Wavelength Route Selection in each territory is accomplished by the Ingress node in territory, has guaranteed the path is set up in the territory flexibility and high efficiency.Simultaneously in the method; Suppose that Egress node has wavelength conversion capability; So when wavelength can not be consistent with previous territory, Ingress node was selected the suitable wavelengths route according to the resource situation in this territory, just Ingress node need carry out wavelength Conversion; Selection wavelength route that like this can be relatively independent in each territory has improved the success rate that connects foundation.
Summary of the invention:
For when setting up cross-domain path, set up light path effectively, to the topological sum resource information in the effective Hidden field in outside, this paper has proposed a kind of path establishment method of wavelength route optical network of multiple domain simultaneously.It may further comprise the steps:
1) source node sends the request that connects with destination node to the webmaster in territory, place, and territory, source node place webmaster judges whether destination node is in this territory, if destination node is to be in this territory; Select destination node according to routing algorithm in the territory; Send to source node and connect to set up indication, instigate source node to be established to the connection of destination node, and send the indication of waiting for connection request to destination node; The indication destination node is waited for the connection request of source node to destination node; Calculate the route between the destination node by source node, and set up the light path of source node, accomplish by the foundation of source node to the light path of destination node to destination node according to signaling protocol; If in territory, source node place, then execution in step 2 for destination node); This territory network domains that solicited message is being carried out that refers to connect wherein, webmaster are the network domains webmaster that solicited message carrying out that connects;
2) territory, source node place webmaster carries out the Egress node selection through the full mesh topology information of oneself grasping; And send connection to source node and set up indication; The indication source node is established to the connection of territory, source node place Egress node; And send the indication of waiting for connection request to Egress node; The indication Egress node is waited for the connection request of source node to Egress node, calculates the route between the Egress node of territory, source node place by source node, sets up the light path of territory, place Egress node from the source node to the source node according to signaling protocol;
3) this territory Egress node is chosen optical link and the wavelength between the next realm entry node, and webmaster indication Egress node sends to the webmaster of the next field and connects the request of foundation, set up the webmaster that solicited message gets into the next field after, execution in step 4);
4) webmaster judges whether destination node is in this territory; If destination node is to be in this territory, select destination node according to routing algorithm in the territory, the Ingress node to the territory that webmaster belongs to sends connection foundation indication; Instigate it to be established to the connection of destination node; And, indicate destination node to wait for the connection request of Ingress node, and execution in step 6) to destination node to the indication that destination node is sent the wait connection request; If destination node does not belong in the territory, webmaster place, execution in step 5);
5) webmaster carries out the Egress node selection through the full mesh topology information of oneself grasping; Webmaster sends to connect to this realm entry node sets up indication; The indication Ingress node is established to the connection of the Egress node that webmaster selected, and simultaneously, webmaster sends the indication of waiting for connection request to this Egress node; The indication Egress node is waited for the connection request of Ingress node to Egress node; The Ingress node in the territory at webmaster place calculates the route between this territory Egress node, sets up the light path from this realm entry node to this territory Egress node according to signaling protocol, and execution in step 3);
6) Ingress node in the territory at webmaster place calculates the route between the destination node, sets up the light path of this realm entry node to destination node according to signaling protocol, accomplishes by the foundation of source node to the light path of destination node.
Path establishment method of the present invention is characterized in that, the Route Selection that the Ingress node in territory, described webmaster place calculates between this territory Egress node is accomplished by Ingress node; Path selection and wavelength by Ingress node carries out in the territory are selected, and adopt identical wavelength transmission information in the territory.
Path establishment method of the present invention; It is characterized in that; The Egress node in described territory has wavelength conversion capability, when the next field can not then need the Egress node in this territory and the Ingress node of the next field to carry out wavelength Conversion when consistent wavelength is adopted in this territory; In transfer process, select the optical fiber and the wavelength of employing by the Egress node in this territory.
Adopt path establishment method of the present invention, the success rate that the path is set up is high.Because Egress node has wavelength conversion capability; So when wavelength can not be consistent with previous territory; Ingress node is selected the suitable wavelengths route according to the resource situation in this territory; Just Ingress node need carry out wavelength Conversion, and selection wavelength route that like this can be relatively independent in each territory has improved the success rate that connects foundation.
Description of drawings:
Fig. 1 is a method flow diagram of the present invention
Fig. 2 is the Topology Legend of multi-domain wavelength routing optical network
The light path that Fig. 3 adopts this method to set up by A to B
Embodiment:
Further specify the present invention below in conjunction with accompanying drawing 2.
The optical-fiber network of Fig. 2 signal is made up of four territories: territory 1, territory 2, territory 3, territory 4.Each territory belongs to different operators, by different administrator administers.Routing device in the territory is lambda router, and the border router in each territory has the wavelength conversion ability.Territory internal resource and topology information are maintained secrecy for overseas, and domain manager is responsible for creating the summary info in its territory, place, and are flooded to other territories to it.Each domain manager can connect the Egress node of selecting on the path for the light of planning to build upright leap territory like this.
If territory medium wavelength router does not have wavelength conversion capability; It is very high connecting the blocking rate of setting up, and in view of the foregoing, we elect the territory Egress node as has wavelength conversion capability; Like this when the next field can't adopt identical wavelength with the previous field; Different wavelengths is adopted in two territories, and lets the outlet node carry out wavelength Conversion, has reduced like this to connect the blocking rate when setting up; And high because have the equipment manufacturing cost of wavelength conversion capability, and the wavelength Conversion number of times is too frequent, and signal distortion rate improves, so we are arranged to there is not wavelength conversion capability with internal node.
Suppose to need to set up the light path from A to B:
1) at first source node A sends connection to webmaster and sets up request, the light path between request foundation and the destination node B.
2) webmaster 1 is judged destination node B and is not in this territory, calculates so carry out inter-domain routing.Webmaster 1 goes out according to the route topological information calculations that is had, and the next field that the path need be passed through is 2, and Egress node is 14.Webmaster 1 sends indication to the Ingress node in this territory 12, indicates it to be established to 14 light and connects; Webmaster 1 sends instruction to Egress node 14, indicates it to send connection foundation request to the webmaster in territory 2 after a while.
3) Ingress node 12 in territory 1 connects according to the light that the wavelength routing algorithm calculates from 12 to 14.Calculating the path at last is 12-14, and the wavelength of selection is λ 1.
4) 14 select and wavelength between 24 and link.Select wavelength X 1 as far as possible,, then select other wavelength, but when transfer of data, need carry out wavelength Conversion if λ 1 is unavailable.Suppose that this moment, λ 1 can use, the Egress node 14 of this time domain 1 is selected the link of 1 free time of λ between 14 and 24.The order of 14 execution webmasters 1 then, the webmaster to territory 2 sends connection foundation request.
5) webmaster 2 is judged destination node B and is not in this territory, calculates so carry out inter-domain routing.Webmaster 2 calculates according to the summary info that is had, and the next field that the path need be passed through is territory 3, and Egress node is 22.Webmaster 2 sends indication to the Ingress node in this territory 24, indicates it to be established to 22 light and connects; Webmaster 2 sends instruction to Egress node 22, indicates it to send connection foundation request to the webmaster in territory 3 after a while.
6) Ingress node 24 in territory 2 calculates 24 to 22 light connection according to the wavelength routing algorithm.Calculating the path at last is 24-23-22; Suppose that λ 1 is unavailable on this moment of this path, suppose that a wavelength available is λ 3, then on this path, select wavelength X 3 for use; When transfer of data, letting inlet 24 carry out wavelength conversion, is λ 3 signals with λ 1 signal transformation of importing.
7) link and the wavelength between 22 selections and territory 3 Ingress nodes 31.Suppose that λ 3 is unavailable at this moment, 22 select a wavelength available λ 6.The order of 22 execution webmasters 2 then, the webmaster to territory 3 sends connection foundation request.
8) webmaster 3 is judged destination node B and is in this territory, and the Egress node that links to each other with B is 32.Webmaster 3 sends indication to Ingress node 31, indicates it to be established to 32 light and connects.
9) Ingress node 31 connects according to the light that the wavelength routing algorithm calculates from 31 to 32.Calculating the path at last is 31-32, supposes that this moment, wavelength X 6 can be used, and then the wavelength of 31 selections is λ 6.
So cross-domain path by A to B has just been set up well, and is as shown in Figure 3.
It is thus clear that; In above-mentioned path establishment method; Carry out the multiple domain Path selection by management plane, guaranteed the fail safe of path foundation and the high efficiency that inter-domain path is selected, but management plane is just selected this territory Egress node of the required process in path; Wavelength Route Selection in each territory is accomplished by the Ingress node in territory, has guaranteed the path is set up in the territory flexibility and high efficiency.And in above-mentioned path establishment method, each territory has all guaranteed the disguise of its topological sum resource information to the outside, and external node is not known the topological sum resource information of territory internal node.Egress node has the right of relatively independent selection wavelength, owing to need not be confined to keep the consistency of wavelength between the territory, the success rate that the path is set up is than higher.
Claims (3)
1. the path establishment method of a multi-domain wavelength routing optical network is characterized in that, this method comprises the steps:
1) source node sends the request that connects with destination node to the webmaster in territory, place; Territory, source node place webmaster judges whether destination node is in this territory, if destination node is to be in this territory, then webmaster is selected destination node according to routing algorithm in the territory; Send connection to source node and set up indication; Instigate source node to be established to the connection of destination node, and webmaster sends the indication of waiting for connection request to destination node, the indication destination node is waited for the connection request of source node to destination node; Calculate the route between the destination node by source node, and set up the light path of source node, accomplish by the foundation of source node to the light path of destination node, process ends to destination node according to signaling protocol; If in territory, source node place, then execution in step 2 for destination node); This territory network domains that solicited message is being carried out that refers to connect wherein, webmaster are the network domains webmaster that solicited message carrying out that connects;
2) territory, source node place webmaster carries out the Egress node selection through the full mesh topology information of oneself grasping; Send connection to source node and set up indication; The indication source node is established to the connection of territory, source node place Egress node; Send the indication of waiting for connection request to Egress node, the indication Egress node is waited for the connection request of source node to Egress node; Calculate the route between the Egress node of territory, source node place by source node, set up the light path of territory, place Egress node from the source node to the source node according to signaling protocol;
3) this territory Egress node is chosen optical link and the wavelength between the next realm entry node, and webmaster indication Egress node sends to the webmaster of the next field and connects the request of foundation, set up the webmaster that solicited message gets into the next field after, execution in step 4);
4) webmaster judges whether destination node is in this territory; If destination node is to be in this territory, select destination node according to routing algorithm in the territory, the Ingress node to the territory that webmaster belongs to sends connection foundation indication; Instigate it to be established to the connection of destination node; And, indicate destination node to wait for the connection request of Ingress node, and execution in step 6) to destination node to the indication that destination node is sent the wait connection request; If destination node does not belong in the territory, webmaster place, execution in step 5);
5) webmaster carries out the Egress node selection through the full mesh topology information of oneself grasping; Webmaster sends to connect to this realm entry node sets up indication; The indication Ingress node is established to the connection of the Egress node that webmaster selected; Simultaneously, webmaster sends the indication of waiting for connection request to this Egress node, and the indication Egress node is waited for the connection request of Ingress node to Egress node; The Ingress node in the territory at webmaster place calculates the route between this territory Egress node, sets up the light path from this realm entry node to this territory Egress node according to signaling protocol, and execution in step 3);
6) Ingress node in the territory at webmaster place calculates the route between the destination node, sets up the light path of this realm entry node to destination node according to signaling protocol, accomplishes by the foundation of source node to the light path of destination node.
2. path establishment method according to claim 1 is characterized in that, the Route Selection that the Ingress node in territory, described webmaster place calculates between this territory Egress node is accomplished by Ingress node; Path selection and wavelength by Ingress node carries out in the territory are selected, and adopt identical wavelength transmission information in the territory.
3. path establishment method according to claim 1; It is characterized in that; The Egress node in described territory has wavelength conversion capability, when the next field can not then need the Egress node in this territory and the Ingress node of the next field to carry out wavelength Conversion when consistent wavelength is adopted in this territory; In transfer process, select the optical fiber and the wavelength of employing by the Egress node in this territory.
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| CN102201973B (en) * | 2010-03-25 | 2015-08-12 | 中兴通讯股份有限公司 | A kind of based on multistage multiplexing route control method G.709 and Gateway Network Element |
| CN101959092B (en) * | 2010-09-28 | 2014-12-10 | 中兴通讯股份有限公司 | WSON (Wavelength Switch Optical Node) route acquisition method and device |
| EP2571184B1 (en) * | 2011-09-16 | 2017-02-22 | Alcatel Lucent | Allocation of spectral capacity in a wavelength-division multiplexing optical network |
| WO2016061778A1 (en) * | 2014-10-23 | 2016-04-28 | 华为技术有限公司 | Optical interconnection system, node, optical network controller, and data transmission method |
| CN109413516A (en) * | 2018-09-05 | 2019-03-01 | 北京邮电大学 | A kind of optical information hiding method and device for optical network system |
| CN114374896A (en) * | 2020-10-14 | 2022-04-19 | 中国移动通信有限公司研究院 | Optical layer connection configuration method, optical layer connection establishing method and optical layer connection establishing device |
| CN112235069B (en) * | 2020-11-18 | 2022-10-25 | 中国联合网络通信集团有限公司 | Transmission method, equipment and system integrating optical wavelength division multiplexing |
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