CN102386973A - Out-of-band signaling-based failure detection and positioning method for light-trail network - Google Patents
Out-of-band signaling-based failure detection and positioning method for light-trail network Download PDFInfo
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Abstract
An out-of-band signaling-based failure detection and positioning method for a light-trail network utilizes summon nodes in the light-trail network to send a failure detection frame through a light monitoring communication channel, and the failure detection frame is the out-of-band signaling which is independent of other light-trail control signallings and has uppermost sending priority compared with other light-trail control signallings; the summon nodes adjust the sending period of the failure detection frame according to the specific survival requirement; non-summon nodes in the light-trail network are downstream nodes; when receiving the failure detection frame, the downstream nodes immediately respond a response frame including the physical address information of the downstream nodes; the priority of the response frame is higher than that of other light-trail control signallings; and when the common nodes receive the response frame from the downstream nodes in a limited time, the communication process of the light-trial network is regarded as normal, or, the communication process goes wrong. The failure detection and positioning method has low cost and is suitable for the characteristics of a light-trail transmission mechanism.
Description
Technical field
The invention belongs to the light switching technology field that is used for metropolitan area network, particularly based on fault detect in the optical-fiber network of optical track transmission mechanism and Fault Locating Method.
Background technology
Rapid growth and WDM technology at IP operation provide under the double stimuli of vast capacity bandwidth resources, and traditional optical-fiber network is towards the optical-fiber network of new generation that is suitable for transmitting IP operation---the evolution of WDM all-optical network.The WDM All-Optical Communication Network is the basis with light switching technology and wavelength division multiplexing transmission technology.Traditionally, the light switching technology can be divided into optical link switching technology, optical packet switching technique and three kinds of fundamental types of OBS.Yet, these three kinds of schemes since the performance of self not enough (optical link switching bandwidth granularity is big, is not suitable for transmitting Packet Service; There are shortcomings such as packet loss height in the light burst-switched) or the restriction (the light packet switching needs high-speed light caching technology and phototiming treatment technology) on the optical technology at present all can not adapt to the IP burst service well.
Optical track (Light-Trails) network is a kind of novel optical switching network structure that was proposed in 2003 by A.Gumaste and I.Chlamtac.The optical track network advocates to adopt existing ripe optics, and the mode with space division multiplexing on an optical channel is carried out Traffic grooming, transmits the information of a plurality of nodes with time-multiplexed mode.And in the transmission of Information process, intermediate node need not carry out reconfiguring based on high-speed optical switch.Because the optical track network has that the dynamic exchange rate is low, the wavelength utilance is high, support wavelet length to dredge and advantages such as multicast transmission, bit rate be transparent, so after its notion proposes, receive network research person's concern gradually.What need particularly point out is that the optical track network has special advantages in new network demand sides such as supporting cloud computing, grid computing, data center.
Though the optical track network is a kind of technical practical and light switching technology solution that transmission performance is good, it is faced with the survivability problem more serious than the optical switching network of other types.The optical track network need pass through Optical Supervisory Channel (OSC) transport tape outer control signaling, after setting up communication process through out-of-band signalling, transmits the information of a plurality of nodes with time-multiplexed mode.So after the communication in OSC was set up and accomplished, each optical track node will be according to pre-determined priority transmission data separately.In said process,, need the data of transmission all can lose in the whole communication cycle so in case the network equipment or transmission cable break down.Therefore, complete survivability mechanism is to be related to one of key factor that can the optical track network practicability.
Yet, at present carry out the method for fault detect and location through the modes such as power penalty of sensed light signal in physical layer, be difficult to before the optical track communication cycle finishes fault point completion fault detect and location, and often need the support of expensive detection equipment.Therefore, propose a kind of cheaply, be fit to the fault detect and the localization method of optical track transmission mechanism characteristics, be a kind of valuable replenishing for the survivability mechanism of improving the optical track network.
Summary of the invention
To have performance not enough and need shortcomings such as expensive detection equipment support, cost height in order to overcome in existing physical layer the method that the fault in the optical track network is detected and locate, the invention provides a kind of cheaply, be fit to the fault detect and the localization method of optical track transmission mechanism characteristics.
The present invention solves the used technical scheme of its technical problem:
In a kind of optical track network based on the fault detect and the localization method of out-of-band signalling; Said optical track network packet includes network node, optical supervisory channel, light data channel, the NMS node administration system that unifies; Wherein, Optical supervisory channel and light data channel are independently channels of wavelength, and the light data channel carries out transfer of data with time-multiplexed mode after optical track communication is set up successfully; Utilize the optical track network convene node to pass through optical supervisory channel to send a kind of fault detect frame; Said fault detect frame is an out-of-band signalling; Said out-of-band signalling is independent of other optical track control signaling, with respect to other optical track control signaling, said out-of-band signalling have the highest transmission priority; Convene the transmission cycle of node according to concrete survivability demand adjustment fault detect frame; The non-node of convening in the definition optical track network is a downstream node;, said downstream node replys an acknowledgement frame after receiving the fault detect frame immediately; Said acknowledgement frame comprises the physical address information of downstream node, and the priority of said acknowledgement frame is higher than said other optical track control signaling;
If convene node in the predetermined reception time limit, to receive all acknowledgement frames from downstream node, judge that the communication process in the optical track network is normal, otherwise, judge in the optical track network fault to have occurred.
Further, the said node of convening adopts the dynamic fault detect frame cycle of sending perhaps to send repeatedly fault detect frame continuously, receives acknowledgement frame one time if receive in the time limit, convenes node to judge that optical track network service is normal.
Further again, said optical track network is a bus-type optical track network, and the node in the optical track network is set to convene node, and the said node of convening is broadcasted to intercycle property this fault detect frame at a fixed time at interval to downstream node;
If convene node in the predetermined reception time limit, to receive the acknowledgement frame that all downstream nodes are replied, judge that optical track network service is normal; If convene node in the predetermined reception time limit, not receive certain perhaps acknowledgement frame of a plurality of downstream nodes, judge that the optical track network breaks down.
Further; Said optical track network is annular optical track network; In loop network, select arbitrarily a node for convening node, convene node pass through optical supervisory channel at a fixed time at interval in, according to the clockwise and counterclockwise both direction frame of Broadcast Fault detection to downstream node periodically;
If convene node in the predetermined reception time limit, to receive the acknowledgement frame of replying, judge that optical track network service is normal from all downstream nodes of both direction; If the acknowledgement frame of convening node in the predetermined reception time limit, not receive certain downstream node perhaps receives only the acknowledgement frame from one of them direction, judge that the optical track network breaks down.
Or: said optical track network is netted optical track network; Be that every optical track in the netted optical track network distributes a unique track number, and the regulation acknowledgement frame of being replied by the downstream node of convening fault detect frame that node sends and every optical track network of every optical track network all must comprise the track number of this optical track;
If the part optical track adopts bus type topological structure in the netted optical track network, according to the processing mode of bus-type optical track network; If the part optical track adopts ring topology in the netted optical track network, according to the processing mode of annular optical track network.
Beneficial effect of the present invention mainly shows: 1. the present invention's transmission fault in the OSC channel detects frame and acknowledgement frame thereof.The OSC channel is two-way communication, and generally is assigned with two independently wavelength.Therefore, utilize the process of OSC Channel Transmission fault detect frame and acknowledgement frame thereof need not increase extra checkout equipment, farthest reduce fault detect and location cost.2. the transmission course of transmission fault detection frame and acknowledgement frame thereof is independent of the optical track communication cycle among the present invention; Therefore the present invention can be independent of the optical track communication cycle to accomplish the detection and the location work of fault, does not change the data transmission mechanism of optical track network simultaneously.3. the fault detect of the present invention's proposition and localization method can require adjust neatly the transmission cycle of fault detect frame and the reception time limit of acknowledgement frame according to concrete survivability.
Description of drawings
Fig. 1 is the structural representation that fault detects frame.
Fig. 2 is the structural representation of acknowledgement frame.
Fig. 3 is that fault detects frame and acknowledgement frame communication process sketch map in the OSC channel.
Fig. 4 is the work schedule sketch map that fault detects frame and acknowledgement frame.
Fig. 5 is fault detect and the sketch map of position fixing process under the bus-type optical track network service normal condition.
Fig. 6 is fault detect and the sketch map of position fixing process under the bus-type optical track network service abnormal conditions.
Fig. 7 is fault detect and the sketch map of position fixing process under the annular optical track network service normal condition.
Fig. 8 is fault detect and the sketch map of position fixing process under the annular optical track network service abnormal conditions.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
With reference to Fig. 1～Fig. 8; In a kind of optical track network based on the fault detect and the localization method of out-of-band signalling; Said optical track network packet includes network node, optical supervisory channel, light data channel, the NMS node administration system that unifies, wherein, optical supervisory channel and light data channel are independently channels of wavelength; The light data channel carries out transfer of data with time-multiplexed mode after optical track communication is set up successfully; Utilize the optical track network convene node to pass through optical supervisory channel to send a kind of fault detect frame; Said fault detect frame is an out-of-band signalling; Said out-of-band signalling is independent of other optical track control signaling, with respect to other optical track control signaling, said out-of-band signalling have the highest transmission priority; Convene the transmission cycle of node according to concrete survivability demand adjustment fault detect frame; The non-node of convening in the definition optical track network is a downstream node;, said downstream node replys an acknowledgement frame after receiving the fault detect frame immediately; Said acknowledgement frame comprises the physical address information of downstream node, and the priority of said acknowledgement frame is higher than said other optical track control signaling;
If convene node in the predetermined reception time limit, to receive all acknowledgement frames from downstream node, judge that the communication process in the optical track network is normal, otherwise, judge in the optical track network fault to have occurred.
Further, the said node of convening adopts the dynamic fault detect frame cycle of sending perhaps to send repeatedly fault detect frame continuously, receives acknowledgement frame one time if receive in the time limit, convenes node to judge that optical track network service is normal.
Fig. 1 is the structural representation that fault detects frame.The fault detect frame is made up of packet header, type, priority, track number and bag tail, needs 14 bytes altogether.Wherein, type identification this frame be the fault detect frame, be commonly defined as 0; Priority is set to the highest, is commonly defined as 0; Track number is used to identify the logical number of optical track, and for fault detect that is used for netted optical track network and localization method, track number is to need to be defined and use; For other optical track networks of two types, track number is used default value 00.
Fig. 2 is the structural representation corresponding to the acknowledgement frame of fault detect frame.Form by packet header, type, priority, track number, physical address and bag tail, need 18 bytes altogether.Wherein, type identification this frame be the acknowledgement frame of fault detect frame, be commonly defined as 1; Priority is set to the highest, is commonly defined as 0; Track number is used to identify the logical number of optical track, and for fault detect that is used for netted optical track network and localization method, track number is to need to be defined and use; For other optical track networks of two types, track number is used default value 00.Physical address is the physical address of this downstream node.
Fig. 3 is that fault detects frame and acknowledgement frame communication process sketch map in the OSC channel.The present invention uses wavelength to be numbered 1 wavelength detects frame as transmission fault in the OSC channel carrier; The use wavelength is numbered 2 wavelength as the carrier of replying acknowledgement frame in the OSC channel.
Fig. 4 is the work schedule sketch map that fault detects frame and acknowledgement frame.Convene node with certain transmission cycle T x Broadcast Fault detection to downstream node frame.Arrive downstream node behind the fault detect frame process propagation delay time Td.Downstream node through Tp after the processing time to convening node to reply acknowledgement frame.Arrive behind the acknowledgement frame process propagation delay time Td and convene node.Convene node detection to accomplish the fault detect and the position fixing process of an optical track network behind the acknowledgement frame.
Instance one: the fault detect and the position fixing process of bus-type optical track network
Shown in Figure 5 is the one-way bus type optical track network of one 4 node.Wherein, node 1 is to convene node, and node 2-4 belongs to downstream node.Special, node 4 belongs to terminal node.Under the normal condition of communication, convene node 1 frame of 2-4 Broadcast Fault detection to downstream node simultaneously.Because the fault detect frame is to have the highest transmission priority, so the control signaling that it can have precedence over other is transmitted in the OSC channel.Downstream node 2-4 is after receiving the fault detect frame, with replying the acknowledgement frame that comprises own physical address immediately.Because acknowledgement frame is to have the highest transmission priority, so the control signaling that it can have precedence over other is transmitted in the OSC channel.Convene node that certain reception time limit can be set and receive acknowledgement frame from downstream node.For the acknowledgement frame of each downstream node, because propagation delay time is different, so the corresponding reception time limit also is different.Such as, from reception time limit of the acknowledgement frame of node 4 be 3 times at least from reception time limit of the acknowledgement frame of node 2.If in the reception time limit separately, (generally will consider the certain time delay shake), convene node to receive acknowledgement frame from its all downstream nodes, convene node to think that the communication process of current time is normal so.
As shown in Figure 6, because fault has taken place the optical fiber link between node 2 and the node 3, convene node in the predetermined reception time limit, not receive acknowledgement frame from node 3 and node 4.So, convene node think node 3 and after the optical track network of node fault has appearred.Convene node and node 2 with stop at once its be transferred to node 3 and after the communication process of node, and the informing network management system is carried out corresponding protection and is switched work.
Instance two: the fault detect of annular optical track network and position fixing process
Shown in Figure 7 is the annular optical track network of one 4 node.Wherein, node 1 is to convene node, and node 2-4 belongs to downstream node.Special, node 3 belongs to terminal node.Under the normal condition of communication, convene node 1 respectively along clockwise with counterclockwise downstream node 2-4 Broadcast Fault being detected frame.Because the fault detect frame is to have the highest transmission priority, so the control signaling that it can have precedence over other is transmitted in the OSC channel.Downstream node 2-4 is after receiving the fault detect frame, with replying the acknowledgement frame that comprises own physical address along opposite direction immediately.Because acknowledgement frame is to have the highest transmission priority, so the control signaling that it can have precedence over other is transmitted in the OSC channel.Convene node that certain reception time limit can be set and receive acknowledgement frame, simultaneously or successively receive two acknowledgement frames that come from same downstream node promptly from the both direction of downstream node.For the acknowledgement frame of each downstream node, because propagation delay time is different, so the corresponding reception time limit also is different.If in the reception time limit separately, (generally will consider the certain time delay shake), convene node to receive acknowledgement frame from the both direction of its all downstream nodes, convene node to think that the communication process of current time is normal so.
As shown in Figure 8; Because fault has taken place in the optical fiber link between node 3 and the node 4; Convene node in the reception time limit of subscribing, not receive clockwise acknowledgement frame, but received anticlockwise acknowledgement frame from node 3 from node 3.Meanwhile, convene node to receive the acknowledgement frame of the both direction that comes from node 4.So, convene node to think that fault has taken place the communication channel between node 3 and the node 4.Convene node and other downstream nodes with the communication process that stops through this faulty link, and the informing network management system is carried out corresponding protection and is switched work at once.
The described content of present embodiment only is enumerating the way of realization of inventive concept; Protection scope of the present invention should not be regarded as and only limit to the concrete form that embodiment states, protection scope of the present invention also reach in those skilled in the art conceive according to the present invention the equivalent technologies means that can expect.
Claims (5)
- In the optical track network based on the fault detect and the localization method of out-of-band signalling; Said optical track network packet includes network node, optical supervisory channel, light data channel, the NMS node administration system that unifies; Wherein, Optical supervisory channel and light data channel are independently channels of wavelength, and the light data channel carries out transfer of data with time-multiplexed mode after optical track communication is set up successfully; It is characterized in that: utilize the optical track network convene node to pass through optical supervisory channel to send a kind of fault detect frame; Said fault detect frame is an out-of-band signalling; Said out-of-band signalling is independent of other optical track control signaling; With respect to other optical track control signaling, said out-of-band signalling have the highest transmission priority; Convene the transmission cycle of node according to concrete survivability demand adjustment fault detect frame; The non-node of convening in the definition optical track network is a downstream node;, said downstream node replys an acknowledgement frame after receiving the fault detect frame immediately; Said acknowledgement frame comprises the physical address information of downstream node, and the priority of said acknowledgement frame is higher than said other optical track control signaling;If convene node in the predetermined reception time limit, to receive all acknowledgement frames from downstream node, judge that the communication process in the optical track network is normal, otherwise, judge in the optical track network fault to have occurred.
- 2. in the optical track network as claimed in claim 1 based on the fault detect and the localization method of out-of-band signalling; It is characterized in that: the said node of convening adopts the dynamic fault detect frame cycle of sending perhaps to send repeatedly fault detect frame continuously; If receive in the time limit and receive acknowledgement frame one time, convene node to judge that optical track network service is normal.
- In according to claim 1 or claim 2 the optical track network based on the fault detect and the localization method of out-of-band signalling; It is characterized in that: said optical track network is a bus-type optical track network; Node in the optical track network is set to convene node, and the said node of convening is broadcasted to intercycle property this fault detect frame at a fixed time at interval to downstream node;If convene node in the predetermined reception time limit, to receive the acknowledgement frame that all downstream nodes are replied, judge that optical track network service is normal; If convene node in the predetermined reception time limit, not receive certain perhaps acknowledgement frame of a plurality of downstream nodes, judge that the optical track network breaks down.
- In according to claim 1 or claim 2 the optical track network based on the fault detect and the localization method of out-of-band signalling; It is characterized in that: said optical track network is annular optical track network; In loop network, select a node for convening node arbitrarily; Convene node pass through optical supervisory channel at a fixed time at interval in, according to clockwise and the counterclockwise both direction frame of Broadcast Fault detection to downstream node periodically;If convene node in the predetermined reception time limit, to receive the acknowledgement frame of replying, judge that optical track network service is normal from all downstream nodes of both direction; If the acknowledgement frame of convening node in the predetermined reception time limit, not receive certain downstream node perhaps receives only the acknowledgement frame from one of them direction, judge that the optical track network breaks down.
- In according to claim 1 or claim 2 the optical track network based on the fault detect and the localization method of out-of-band signalling; It is characterized in that: said optical track network is netted optical track network; Be that every optical track in the netted optical track network distributes a unique track number, and the regulation acknowledgement frame of being replied by the downstream node of convening fault detect frame that node sends and every optical track network of every optical track network all must comprise the track number of this optical track;If the part optical track adopts bus type topological structure in the netted optical track network, the node in the optical track network is set to convene node, and the said node of convening is broadcasted to intercycle property this fault detect frame at a fixed time at interval to downstream node; If convene node in the predetermined reception time limit, to receive the acknowledgement frame that all downstream nodes are replied, judge that optical track network service is normal; If convene node in the predetermined reception time limit, not receive certain perhaps acknowledgement frame of a plurality of downstream nodes, judge that the optical track network breaks down;If the part optical track adopts ring topology in the netted optical track network; In loop network, select a node for convening node arbitrarily; Convene node pass through optical supervisory channel at a fixed time at interval in, according to clockwise and the counterclockwise both direction frame of Broadcast Fault detection to downstream node periodically; If convene node in the predetermined reception time limit, to receive the acknowledgement frame of replying, judge that optical track network service is normal from all downstream nodes of both direction; If the acknowledgement frame of convening node in the predetermined reception time limit, not receive certain downstream node perhaps receives only the acknowledgement frame from one of them direction, judge that the optical track network breaks down.
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