CN1322713C - Method for enhancing survivability of automatic exchange optical network - Google Patents
Method for enhancing survivability of automatic exchange optical network Download PDFInfo
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- CN1322713C CN1322713C CNB2005100115720A CN200510011572A CN1322713C CN 1322713 C CN1322713 C CN 1322713C CN B2005100115720 A CNB2005100115720 A CN B2005100115720A CN 200510011572 A CN200510011572 A CN 200510011572A CN 1322713 C CN1322713 C CN 1322713C
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Abstract
The present invention relates to a method for intensifying the survivability of automatic light exchanging networks, which belongs to the technical field of light networks. The present invention discloses an ASON survivability intensifying method. In the method, downstream nodes of a damaged link are utilized to coordinate the light network resource allocation of a damaged channel, so the influence of the conflict of light network resources on the survivability of a network during the maintenance of the link is avoided, and the restoring successful rate is enhanced; a grading and parallel restoring process is adopted, so the connection establishing time is shortened.
Description
Technical field
The invention belongs to the optical-fiber network technical field, particularly ASON (ASON) based on the recovery resource coordination of control plane and with the quick recovery process of fault.
Background technology
International Telecommunications Union's tissue (ITU-T) is positioned ASON (ASON/ASTN) for the global unified net that transmits, and estimates that have thousands of switch future and millions of terminal node is linked in this network.The simple optical fiber transmission rate has reached Tbps (1012 bit/s) magnitude at present, and ASON optical-fiber network simple optical fiber breaks down (as fibercuts), causes losing of a large number of users data at short notice, causes network service quality (QoS) to descend.The reliability of carrier grade service quality requirement 99.999% allows in promptly average 1 year that the time of service interruption sum only is about 5 minutes.Therefore recovery technology is the key technology of ASON optical-fiber network, in ASON in occupation of more and more important position.
Detect the fault of optical fiber link as ASON after, ASON starts failover procedure, sets up route and distribute corresponding optical network resource for again these impairment signals.In said process, for recovery time of guaranteeing impairment signal with revert to power, need the time that solves the conflict of impairment signal optical network resource and reduce recovery process.
The solution of impairment signal optical network resource collision problem is adopted " retry mechanism " at present.Just when ASON redistributes resource for certain impairment signal,, then redistribute Internet resources, up to being allocated successfully or distributing number of times to surpass the threshold value of setting if unsuccessful.The advantage of this aspect be the success rate recovered than higher, shortcoming is: the time of recovery is long, thereby has reduced the survivability ability of network.
The time of recovery process mainly is limited by the new establishment of connection time in the process strategy of recovery and the recovery process.The time of recovery process is short, and then the survivability ability of optical-fiber network is just strong.
Summary of the invention
The present invention proposes a kind of ASON survivability Enhancement Method, and the optical network resource that utilizes the downstream node of impaired link to coordinate impaired channel distributes, and solves in the link failure recovery process optical network resource conflict to the influence of network survivability performance; Adopt a kind of classification, parallel recovery process, reduce connection setup time.
Technical scheme of the present invention is as follows:
1. method that strengthens survivability of automatic exchange optical network is characterized in that: after certain optical fiber link of ASON breaks down, handle in two kinds of situation:
1) if fiber failure is in some routed domain, then carry out following steps:
1.1) downstream node that links to each other with this faulty link inquiry link-local resource database, obtain inlet, the exit address of all impaired channels in this routed domain;
1.2) downstream node is the restoration routes in all impaired these routed domain of channel calculation, and determines the optical network resource distribution principle for these impaired channels;
1.3) downstream node is to step 1.2) and described in the start node of this routed domain restoration route send and comprise route messages and set up with being connected of optical network resource distribution principle and order;
1.4) step 1.3) and described in start node adopt parallel method to set up new connection for impaired channel:
1.4.1) described start node receives and connect to set up order, the downstream node in this route is transmitted this order at once; And, distribute local optical network resource according to the resource allocation principle;
1.4.2) intermediate node of restoration route, receiving that the upstream transmits after the connection that comes sets up order, the downstream node in this route is transmitted this order at once; And, distribute local optical network resource according to the resource allocation principle;
1.4.3) last node of restoration route, receiving that the upstream transmits after the connection that comes sets up order,, distribute local optical network resource according to the resource allocation principle; And upstream nodes is sent the message of resource allocation success or not;
1.4.4) intermediate node is received the message of the resource allocation success that its downstream node sends, if also success of local resource allocation, then upstream nodes forwarding resource allocation success message; If local resource allocation is unsuccessful, then sends the unsuccessful message of resource allocation, and discharge local optical network resource to its upstream and downstream node;
Intermediate node is received the unsuccessful message of resource allocation that its downstream node sends, and sends the unsuccessful message of resource allocation to its upstream node, and discharges local optical network resource;
1.4.5) start node receives the message of resource allocation success, sends the message of recovering successful to optical-fiber network; Start node is received the unsuccessful message of resource allocation, is released to the optical network resource that this recovery takies, and forwards step 2.3 to), the recovery process of execution higher level routed domain;
2) if fiber failure is between certain two routed domain, then carry out following steps:
2.1) downstream node that links to each other with this faulty link inquiry link-local resource database, obtain source, address, place and the impaired link information of all impaired channels;
2.2) downstream node determines the optical network resource distribution principle for all impaired channels;
2.3) downstream node to higher level's routed domain represent node send comprise step 2.1) described in source, address, place and the impaired link information and the step 2.2 of impaired channel) described in the connection of optical network resource distribution principle set up order;
2.4) step 2.3) and described in the node of representing of higher level's routed domain calculate the restoration route of all impaired channels in this routed domain, send to the start node of restoration route and comprise route messages and set up with being connected of optical network resource distribution principle and order;
2.5) step 2.4) and described in start node execution in step 1.4.1) to 1.4.4), to determine of the connection of impaired channel in this routed domain;
If successful connection, the node of representing of then described higher level's routed domain sends to its subordinate's routed domain and comprises described start node, last node and set up with being connected of optical network resource distribution principle and order; If connect unsuccessful, then described higher level's routed domain represent node to its higher level's routed domain represent node send comprise step 2.1) source, address, place and the impaired link information and the step 2.2 of described impaired channel) connection of described optical network resource distribution principle sets up order; And repeated execution of steps 2.4) and 2.5);
2.6) step 2.5) and described in the Ingress node of subordinate's routed domain after receiving that order is set up in described connection, execution in step 1.4.1) to 1.4.4), to determine of the connection of impaired channel in this routed domain;
Set up successfully if connect, the Ingress node of then described subordinate routed domain sends successful connection message to the node of representing of higher level's routed domain; After the representing node and receive described successful connection message of higher level's routed domain, produce and recover success message;
Set up failure if connect, the Ingress node of then described subordinate routed domain sends connection failure message to the node of representing of higher level's routed domain; The node of representing of higher level's routed domain is received described connection failure message, to its higher level's routed domain represent node send comprise step 2.1) described in source, address, place and the impaired link information and the step 2.2 of impaired channel) described in the connection of optical network resource distribution principle set up order; And repeated execution of steps 2.4) and 2.5);
If it is still unsuccessful that higher level's routed domain is recovered, then send the recovery failure to optical-fiber network, discharge the corresponding light Internet resources simultaneously.
The present invention has two outstanding characteristics: 1, coordinated to recover channel and set up optical network resource in the process, solved in the channel recovery process, recovered the vie each other phenomenon of resource of channel, improved the success rate of recovering, correspondingly reduced the time of recovering; 2, adopt the recovery process of classification, restoration path shortens like this, and the signaling procedure of recovery, the number of nodes that recovers to design all significantly reduce, and this measure has also greatly reduced the recovery time of channel.
Utilize the present invention, being made up of on the analog network platform 243 nodes, tested the recovery time of network, Mean Time To Recovery (15 jump) is 298 milliseconds.
Description of drawings
Fig. 1 is the schematic diagram of network topology.
Fig. 2 is the flow chart of the method for the invention.
Embodiment
Specify embodiments of the invention below in conjunction with accompanying drawing.
Fig. 1 has shown an embodiment of wavelength route optical network topology.This wavelength route optical network is made up of two-stage.Each grade is made up of the routed domain that quantity does not wait.Each routed domain is by logically being made up of datum plane and control plane, and the optical node device (following abbreviation node) with some is associated physically.In this example: the first order of optical-fiber network has comprised routed domain 1 and 2 two routed domain of routed domain, and the second level of optical-fiber network comprises routed domain 3.Mark 11,12,13,14 and the 15 expressions node relevant with routed domain 1; Mark 21,22,23,24 and the 25 expressions node relevant with routed domain 2; Mark 31,32,33 and the 34 expressions node relevant with routed domain 3.The datum plane of routed domain 1 and control plane realize that by node 11,12,13,14 and 15 datum plane of routed domain 2 and control plane are realized by node 21,22,23,24 and 25.Routed domain 1, routed domain 2 constitute routed domain 3.The datum plane of routed domain 3 and control plane are realized by node 31,32,33 and 34.Connect by optical fiber between the node, transmit wavelength-division-multiplexed optical signal in the optical fiber, transmit 40 the tunnel in this example, with λ 1, λ 2 ..., λ 40 expressions.
Relation between routed domain 3 and routed domain 1, the routed domain 2 satisfies the strategy that comprises that ITU-T G8080 advised: routed domain 1, routed domain 2 are completely contained in the routed domain 3.
Each node among Fig. 1 has all embedded Routing Protocol, signaling protocol and LMP Link Manager Protocol.These agreements can be popular SPF (OSPF) Routing Protocols based on Generalized Multi-Protocol Label Switching bunch of present optical-fiber network, resource reservation (RSVP-TE) signaling protocol and LMP LMP Link Manager Protocol.Specify by optical network management system: node 31 is that control plane is at the partial node of representing; Node 12,24 is respectively control plane and represents node in first order routed domain 1, routed domain 2.
Utilize the C language under the linux system, will be developed to the recovery modular program, and described recovery modular program is embedded in the optical node devices all in the optical-fiber network according to the method for the invention.The flow process of recovery modular program as shown in Figure 2.Below by for example, the operation principle of recovering module is described.
Suppose that fracture appears in the optical fiber between the connected node 22 and node 23 among Fig. 1, node 23 detects this fault, produces fault alarm signal, triggers the recovery process of optical-fiber network:
1) the recovery module of node 23 at first failure judgement optical fiber be to belong to the routed domain internal fault, or the fault between the routed domain.
This fault belongs to the situation of routed domain 2 internal faults.
2) its link circuit resource databases of node 23 inquiry are informed in the optical wavelength quantity of transmitting in the broken fiber, and the input in routed domain 2, output node address.
For illustrating, suppose two wavelength of transmission in the broken fiber in this example, be respectively λ 1 and λ 2; These two signals are all from routed domain 1, and they are respectively node 21 and node 22 at the Ingress node of routed domain 2, and outlet all is a node 25.
3) recover module in the node 23 and start the routing calculation module that embeds the ospf protocol in this node, be again above-mentioned two channel calculation from node 21 to node 25, node 22 is to the route of node 25, and the distribution principle of definite optical wavelength resources.
For illustrating, suppose that in this example routing calculation module in the OSPF Routing Protocol calculates node 21 to the route of node 25 and is: 21 inlet 21I3-〉21 outlet 21E1-〉24 inlet 24I4-〉24 outlet 24E1-〉25 inlet 25I3-〉25 outlet 25E1; Node 22 to the route of node 25 is: 22 inlet 22I3-〉22 outlet 22E1-〉24 inlet 24I3-〉24 outlet 24E1-〉25 inlet 25I3-〉25 outlet 25E1.
The optical wavelength resources distribution principle is decided according to different network operation situations, and for illustrating, adopt following distribution principle in this example: the wavelength available of first channel is λ 1; The wavelength available of second channel is λ 2.
4) node 23 sends 21I3-to node 21〉21E1-〉24I4-〉24E1-〉25I3-〉connection of 25E1 sets up order, and the available light wavelength when stipulating that this connection is set up is λ 1; Send 22I3-to node 22〉22E1-〉24I3-〉24E1-〉25I3-〉connection of 25E1 sets up order, and the available light wavelength when stipulating that this connection is set up is λ 2.
5) node 21 is the light resources distribution principle of λ 1 to node 24 forwarding connection foundation orders and wavelength available; Node 21 sends to this locality and sets up 21I3-〉the link order of 21E1 based on wavelength X 1;
6) node 24 is the light resources distribution principle of λ 1 to node 25 forwarding connection foundation orders and wavelength available; Node 24 sends to this locality and sets up 24I4-〉the link order of 24E1 based on wavelength X 1;
7) node 25 sends to this locality and sets up 25I3-〉the link order of 25E1 based on wavelength X 1.Successful connection is sent success message to node 24;
Node 21 sends channel 1 and recovers success message.
Following step 8), 9), 10) with above-mentioned steps 5), 6), 7) carry out simultaneously.
8) node 22 is the light resources distribution principle of λ 2 to node 24 forwarding connection foundation orders and wavelength available; Node 22 sends to this locality and sets up 22I3-〉the link order of 22E1 based on wavelength X 2;
9) node 24 is the light resources distribution principle of λ 2 to node 25 forwarding connection foundation orders and wavelength available; Node 24 sends to this locality and sets up 24I3-〉the link order of 24E1 based on wavelength X 2;
10) node 25 sends to this locality and sets up 25I3-〉the link order of 25E1 based on wavelength X 2.Successful connection is sent success message to node 24;
Recovery process finishes.
If recover failure, to suppose to recover failure based on the channel of wavelength X 1 herein, node 21 is with this message informing node 23, and all nodes send the light resources release message on restoration path simultaneously, are released to the optical network resource that this recovery takies.
Suppose that fracture appears in the optical fiber between the connected node 15 and node 22 among Fig. 1, node 22 detects this fault, produces fault alarm signal, triggers the recovery process of optical-fiber network:
1) the recovery module of node 22 at first failure judgement optical fiber be to belong to the routed domain internal fault, or the fault between the routed domain.
This fault belongs to the situation of fault between routed domain 1 and the routed domain 2.
2) node 22 its link circuit resource databases of inquiry are known the source that optical wavelength, these optical wavelength connected, the destination node address of transmitting in the broken fiber, the broken fiber identifier.
For illustrating, suppose two wavelength of transmission in the broken fiber in this example, be respectively λ 1 and λ 2; If the source address of these two signals is respectively 11 inlet 11I3 and 12 inlet 12I3; The address, place is respectively 23 outlet 23E1 and 24 outlet 24E1; If broken fiber be designated 15 gateway 15IE1-22 gateway 22IE3.
3) node 22 is determined the optical wavelength resources distribution principle of the recovery channel of above-mentioned two impaired channels.
The optical wavelength resources distribution principle is decided according to different network operation situations, and for illustrating, adopt following distribution principle in this example: the wavelength available of first channel is λ 1; The wavelength available of second channel is λ 2.
4) node 22 is to the node of representing of routed domain 3, and promptly node 31 sends following connection request: wavelength X 1 connects 11I3-〉23E1; Wavelength X 2 connects 12I3-〉24E1; Route is set up the optical fiber of avoiding connecting 15IE1-22IE3.
5) node 31 calculates corresponding route and gives the corresponding wavelength of each route assignment in routed domain 3.
For illustrating, the route of establishing node 31 in this example and be two channel calculation is identical, is 31E1-〉34I2; The Wavelength Assignment success.
6) node 31 sends connection foundation request to the node 12 of representing of routed domain 1: wavelength X 1 connects 11I3-〉13E1; Wavelength X 2 connects 12I3-〉13E1; Represent node 24 to routed domain 2 and send connection foundation request: wavelength X 1 connects 21I3-〉13E1; Wavelength X 2 connects 21I3-〉13E1.
7) node of representing of routed domain 1, routed domain 2 is initiated the corresponding process of setting up that connects in this routed domain.Set up successfully if connect, then send the network recovery success message.
Recovery process is finished.
If connection failure in this example assumes routed domain 1, is set up failure based on the connection of wavelength X 1, then represent node 12 and send based on wavelength X 1 recovery failure to the node 31 of representing of routed domain 3, discharge the Internet resources that this routed domain is used for this connection simultaneously;
In this example, owing to be two-level network, node 31 is in the higher level of network, so node 31 recovers failure to the impaired channel that network sends based on λ 1, sends the recovery resource of release based on λ 1 to routed domain 2 simultaneously; If the more than two-stage of network, then node 31 will continue upwards primary network station request recovery establishment of connection.
Claims (1)
1. method that strengthens survivability of automatic exchange optical network is characterized in that: after certain optical fiber link of ASON breaks down, handle in two kinds of situation:
1) if fiber failure is in some routed domain, then carry out following steps:
1.1) downstream node that links to each other with this faulty link inquiry link-local resource database, obtain inlet, the exit address of all impaired channels in this routed domain;
1.2) downstream node is the restoration routes in all impaired these routed domain of channel calculation, and determines the optical network resource distribution principle for these impaired channels;
1.3) downstream node is to step 1.2) and described in the start node of this routed domain restoration route send and comprise route messages and set up with being connected of optical network resource distribution principle and order;
1.4) step 1.3) and described in start node adopt parallel method to set up new connection for impaired channel:
1.4.1) described start node receives and connect to set up order, the downstream node in this route is transmitted this order at once; And, distribute local optical network resource according to the resource allocation principle;
1.4.2) intermediate node of restoration route, receiving that the upstream transmits after the connection that comes sets up order, the downstream node in this route is transmitted this order at once; And, distribute local optical network resource according to the resource allocation principle;
1.4.3) last node of restoration route, receiving that the upstream transmits after the connection that comes sets up order,, distribute local optical network resource according to the resource allocation principle; And upstream nodes is sent the message of resource allocation success or not;
1.4.4) intermediate node is received the message of the resource allocation success that its downstream node sends, if also success of local resource allocation, then upstream nodes forwarding resource allocation success message; If local resource allocation is unsuccessful, then sends the unsuccessful message of resource allocation, and discharge local optical network resource to its upstream and downstream node;
Intermediate node is received the unsuccessful message of resource allocation that its downstream node sends, and sends the unsuccessful message of resource allocation to its upstream node, and discharges local optical network resource;
1.4.5) start node receives the message of resource allocation success, sends the message of recovering successful to optical-fiber network; Start node is received the unsuccessful message of resource allocation, is released to the optical network resource that this recovery takies, and forwards step 2.3 to), the recovery process of execution higher level routed domain;
2) if fiber failure is between certain two routed domain, then carry out following steps:
2.1) downstream node that links to each other with this faulty link inquiry link-local resource database, obtain source, address, place and the impaired link information of all impaired channels;
2.2) downstream node determines the optical network resource distribution principle for all impaired channels;
2.3) downstream node to higher level's routed domain represent node send comprise step 2.1) described in source, address, place and the impaired link information and the step 2.2 of impaired channel) described in the connection of optical network resource distribution principle set up order;
2.4) step 2.3) and described in the node of representing of higher level's routed domain calculate the restoration route of all impaired channels in this routed domain, send to the start node of restoration route and comprise route messages and set up with being connected of optical network resource distribution principle and order;
2.5) step 2.4) and described in start node execution in step 1.4.1) to 1.4.4), to determine of the connection of impaired channel in this routed domain;
If successful connection, the node of representing of then described higher level's routed domain sends to its subordinate's routed domain and comprises described start node, last node and set up with being connected of optical network resource distribution principle and order; If connect unsuccessful, then described higher level's routed domain represent node to its higher level's routed domain represent node send comprise step 2.1) source, address, place and the impaired link information and the step 2.2 of described impaired channel) connection of described optical network resource distribution principle sets up order; And repeated execution of steps 2.4) and 2.5);
2.6) step 2.5) and described in the Ingress node of subordinate's routed domain after receiving that order is set up in described connection, execution in step 1.4.1) to 1.4.4), to determine of the connection of impaired channel in this routed domain;
Set up successfully if connect, the Ingress node of then described subordinate routed domain sends successful connection message to the node of representing of higher level's routed domain; After the representing node and receive described successful connection message of higher level's routed domain, produce and recover success message;
Set up failure if connect, the Ingress node of then described subordinate routed domain sends connection failure message to the node of representing of higher level's routed domain; The node of representing of higher level's routed domain is received described connection failure message, to its higher level's routed domain represent node send comprise step 2.1) described in source, address, place and the impaired link information and the step 2.2 of impaired channel) described in the connection of optical network resource distribution principle set up order; And repeated execution of steps 2.4) and 2.5);
If it is still unsuccessful that higher level's routed domain is recovered, then send the recovery failure to optical-fiber network, discharge the corresponding light Internet resources simultaneously.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100452719C (en) * | 2005-11-25 | 2009-01-14 | 北京邮电大学 | Shared network protection method of automatic switched optical network based on reserve capacity mechanism |
| CN100490390C (en) | 2006-01-10 | 2009-05-20 | 华为技术有限公司 | Service failure recovery method |
| CN100426749C (en) * | 2006-03-01 | 2008-10-15 | 华为技术有限公司 | Processing equipment and method of resource modifying fault |
| CN101188513B (en) * | 2007-10-31 | 2010-06-23 | 深圳市优驿科技有限公司 | Intelligent optical network and network capacity planning method resisting at least two link interruptions |
| CN101286939B (en) * | 2008-05-05 | 2010-07-28 | 清华大学 | Short optical path delayed demolishing method of wavelength routing optical network |
| CN101729936B (en) * | 2008-10-30 | 2014-04-09 | 中兴通讯股份有限公司 | Connection restoration method and routing domain of automatic exchange optical network |
| CN101883051B (en) * | 2010-07-07 | 2012-07-04 | 西安交通大学 | Hybrid network resource optimization method based on business |
| CN102487329B (en) * | 2010-12-02 | 2016-03-30 | 中兴通讯股份有限公司 | Service restoration method and device |
| CN102137020B (en) * | 2011-03-30 | 2013-09-04 | 烽火通信科技股份有限公司 | High-service volume concurrent processing method of in automatically switched optical network (ASON) |
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| EP1283653A2 (en) * | 2001-08-09 | 2003-02-12 | Siemens Aktiengesellschaft | Signalling proxy for automatic setup of backup paths in optical networks |
| EP1383261A1 (en) * | 2002-07-15 | 2004-01-21 | Alcatel | Protection method and system for traffic of different service classes |
| CN1424827A (en) * | 2003-01-09 | 2003-06-18 | 上海交通大学 | Bidirectional channel restitution in automatic optical exchange network |
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