CN105792028B - Method and system for realizing nesting protection - Google Patents
Method and system for realizing nesting protection Download PDFInfo
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- CN105792028B CN105792028B CN201410812355.0A CN201410812355A CN105792028B CN 105792028 B CN105792028 B CN 105792028B CN 201410812355 A CN201410812355 A CN 201410812355A CN 105792028 B CN105792028 B CN 105792028B
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Abstract
The invention provides a method and a system for realizing nesting protection; the method comprises the following steps: respectively setting delay timers corresponding to different paths in the protection group, setting the timing time of the delay timer corresponding to the innermost path to a specific value, and setting the timing time of the delay timer corresponding to the outer path to be greater than the specific value; when the fault change is detected, acquiring the timing time of a delay timer corresponding to a path where the fault change position is located, and calculating the state of a protection group when the timing time is a specific value; and starting a delay timer corresponding to a path where the fault changes when the fault does not reach the specific value, detecting whether the change of the fault is unchanged or not after the timing time of the delay timer is up, and calculating the state of the protection group when the change of the fault is unchanged. The invention can overcome the problem of the meaningless increase of the protection switching time caused by different nesting levels of the working path and the protection path in the prior standard technology.
Description
Technical Field
The invention relates to a protection control technology based on a transmission network, in particular to a method and a system for realizing nested protection.
Background
As network traffic demands bandwidth increase, operators and system manufacturers are constantly considering issues of improving traffic delivery technologies. The evolution of digital transport networks has also progressed from the original first generation digital transport networks based on T1/E1, through the second generation digital transport networks based on SONET (synchronous optical network)/SDH (synchronous digital hierarchy), to the third generation digital transport networks currently based on OTN (optical transport network). As a next generation transport network, the network environment faced by the OTN is more complex, and the survivability of the network is an important issue of the OTN.
From the network level, the current network can perform multi-layer nesting, and the problem of how to coordinate the processing of protecting the switch machine at multiple layers is more obvious. There is therefore a need for a way for a server layer protection switch to resolve the problem before a client layer switch occurs.
The g.873.1 standard addresses the problem of protection cascading/nesting by providing each protection group with a configurable hysteresis timer. However, this method still has some problems, when the nested protection levels of working or protection paths are different, the protection group waits for unnecessary time without limitation, instead of fast protection switching, so that the service interruption time is increased meaninglessly, that is, the situation that the nested levels of different paths (working or protection) are different cannot be satisfied.
Disclosure of Invention
The technical problem to be solved by the present invention is to overcome the problem of meaningless increase of protection switching time caused by different nesting levels of working/protection paths in the prior art, and to provide a scheme for different paths in a protection group to use different lingering timers.
In order to solve the above problem, the present invention provides a method for implementing nesting protection, including:
respectively setting delay timers corresponding to different paths in the protection group, setting the timing time of the delay timer corresponding to the innermost path to a specific value, and setting the timing time of the delay timer corresponding to the outer path to be greater than the specific value;
when the fault change is detected, acquiring the timing time of a delay timer corresponding to a path where the fault change position is located, and calculating the state of a protection group when the acquired timing time is the specific value; and when the acquired timing time is not the specific value, starting a lingering timer corresponding to a path where the fault changes, detecting whether the change of the fault is unchanged or not again after the timing time of the lingering timer is reached, and calculating the state of the protection group when the change of the fault is not changed.
Optionally, the innermost path is a path that does not include other protection groups; the outer layer path is a path which comprises other protection groups;
the setting the timing time of the linger timer corresponding to the outer layer path to be greater than the specific value comprises:
setting the timing time of a lingering timer corresponding to the outer layer path as T1+ T2; t1 is the maximum value of the timing time of the linger timer corresponding to each path in the protection group included in the outer path; t2 is greater than or equal to the time for the included protection group to complete protection switching.
Optionally, the specific value is 0.
Optionally, the linger timer is located in a controller of the protection system.
Optionally, each of the lingering timers is respectively located in a detector of a corresponding path in the protection system;
the compute protected group state includes:
and the detector reports the change of the fault to a controller in the protection system, and the controller calculates the state of the protection group.
The invention also provides a system for realizing nesting protection, which comprises:
lingering timers respectively corresponding to different paths in the protection group;
the setting module is used for respectively setting the lingering timers corresponding to different paths in the protection group, setting the timing time of the lingering timer corresponding to the innermost path as a specific value, and setting the timing time of the lingering timer corresponding to the outer path as a value larger than the specific value;
the execution module is used for acquiring the timing time of a delay timer corresponding to a path where the position where the fault changes when the fault changes is detected, and calculating the state of the protection group when the acquired timing time is the specific value; and when the acquired timing time is not the specific value, starting a lingering timer corresponding to a path where the fault changes, detecting whether the change of the fault is unchanged or not again after the timing time of the lingering timer is reached, and calculating the state of the protection group when the change of the fault is not changed.
Optionally, the innermost path is a path that does not include other protection groups; the outer layer path is a path which comprises other protection groups;
the setting module sets the timing time of the lingering timer corresponding to the outer layer path to be greater than the specific value, namely:
the setting module sets the timing time of the lingering timer corresponding to the outer layer path to be T1+ T2; t1 is the maximum value of the timing time of the linger timer corresponding to each path in the protection group included in the outer path; t2 is greater than or equal to the time for the included protection group to complete protection switching.
Optionally, the specific value is 0.
Optionally, the linger timer and the execution module are located in a controller of the protection system.
Optionally, each of the lingering timers is respectively located in a detector of a corresponding path in the protection system;
the detectors of each path are respectively provided with one execution module;
the execution module calculates the protection group state by:
and the execution module reports the change of the fault to a controller of the protection system, and the controller calculates the state of the protection group.
Compared with the prior art, the method and the system of the invention achieve the effect of reducing the service interruption time.
Drawings
FIG. 1 is a flowchart illustrating a method for implementing nested protection according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a protection system architecture.
Fig. 3 is a schematic diagram of protection nesting implemented by a controller.
Fig. 4 is a schematic diagram of the implementation of protected nesting by a detector.
Fig. 5 is a schematic diagram of OCH (optical channel) 1+1 protection working path nested OTS (optical transport segment layer) 1+ 1.
Detailed Description
The technical solution of the present invention will be described in more detail with reference to the accompanying drawings and examples.
It should be noted that, if not conflicting, the embodiments of the present invention and the features of the embodiments may be combined with each other within the scope of protection of the present invention. Additionally, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
An embodiment of the present invention provides a method for implementing nesting protection, as shown in fig. 1, including:
respectively setting delay timers corresponding to different paths in the protection group, setting the timing time of the delay timer corresponding to the innermost path to a specific value, and setting the timing time of the delay timer corresponding to the outer path to be greater than the specific value;
when the fault change is detected, acquiring the timing time of a delay timer corresponding to a path where the fault change position is located, and calculating the state of a protection group when the acquired timing time is the specific value; and when the acquired timing time is not the specific value, starting a lingering timer corresponding to a path where the fault changes, detecting whether the change of the fault is unchanged or not again after the timing time of the lingering timer is reached, and calculating the state of the protection group when the change of the fault is not changed.
Wherein, the fault occurrence change comprises fault generation and fault disappearance; when the fault is changed into the fault, the unchanged change means that the fault still exists; when the failure is changed to the failure disappearance, the change is unchanged, which means that there is no failure.
The innermost path is a path which does not contain other protection groups, and can be a working path or a protection path; the outer layer path is a path which comprises other protection groups on the path, and can be a working path or a protection path;
the setting the timing time of the linger timer corresponding to the outer layer path to be greater than the specific value may specifically include:
setting the timing time of a lingering timer corresponding to the outer layer path as T1+ T2; t1 is the maximum value of the timing time of the linger timer corresponding to each path in the protection group included in the outer path; t2 is greater than or equal to the time for the included protection group to complete protection switching.
Wherein the specific value may be, but is not limited to, 0.
In one implementation, the linger timers may each be located in a controller of the protection system.
In another implementation, each of the linger timers may be located in a detector of a corresponding path in the protection system.
The two implementation methods included in the embodiment of the present invention are specifically as follows:
the method comprises the following steps: the controller is arranged to realize that different paths adopt different lingering timer methods.
The architecture of the protection system is shown in fig. 2, each protection system is composed of a controller, a plurality of detectors, a plurality of actuators and a protocol transmitter, wherein the detectors are responsible for fault acquisition and reporting, the controllers are responsible for processing external input and performing protocol calculation to obtain a final state of a protection group, the actuators are responsible for executing switching actions, and the protocol transmitter is responsible for transmitting protocol signaling.
To implement the method of using different Holdoff-timers for different paths, different Holdoff timers may be enabled for different external inputs (alarms) in the controller, as shown in fig. 3 (only one Holdoff timer is shown in fig. 3 for illustration and does not represent only one Holdoff timer), and the Holdoff timers are located in the controller.
In a first method, the method for implementing nested protection includes the following steps:
the first step starts the protected group configuration.
In the second step, the timing time of the linger timer of the first working path W1 in the protection group is set to TW1, the timing time of the linger timer of the second working path W2 is set to TW2, and so on, the timing time of the linger timer of the nth working path WN is set to TWN.
And thirdly, setting the timing time of a delay timer of a first protection path P1 in the protection group to be TP1, setting the timing time of a delay timer of a second protection path P2 in the protection group to be TP2, and so on, and setting the timing time of a delay timer of an Mth working path PM to be TPN.
In the second and third steps, the timing time of the lingering timer corresponding to the innermost working path/protection path is set to 0, and the timing time M1 of the lingering timer corresponding to the path a1 (which may be a working path or a protection path) directly including the innermost protection group (i.e., the path does not include the protection group of other protection groups) is set to be greater than or equal to M (M is a step length, and it is considered that the protection switching at the M time inner layer can be completed); setting the timing time M2 of a lingering timer corresponding to a path M2 (which may be a working path or a protection path) of a protection group including the path A1 to be greater than or equal to M1+ M (which may be, but is not limited to, 2M); and so on.
And fourthly, completing the configuration of the protection group.
Fifthly, when the path fault of Wi (or Pj) changes, taking the fault generation as an example, after the detector detects that the alarm is reported to the controller, the controller checks the timing time of the TWi (or TPj), if the timing time of the TWi (or TPj) is 0, the protocol is immediately calculated to obtain the state of the protection group, if the timing time of the TWi (or TPj) is not 0, a delay timer of the TWi (or TPj) is started, when the timer of the TWi (or TPj) fails (namely the timing time arrives), whether the fault still exists in the detector Wi (or Pj) is checked first, and if the fault still exists (the fault can be different from the fault reported initially), the protocol calculation is carried out to obtain the state of the protection group; if the fault does not exist, no action is taken.
The second method comprises the following steps: the detector is arranged to realize that different paths adopt different lingering timer methods.
The architecture of the protection system is shown in fig. 2, each protection system is composed of a controller, a plurality of detectors, a plurality of actuators and a protocol transmitter, wherein the detectors are responsible for fault acquisition and reporting, the controllers are responsible for processing external input and performing protocol calculation to obtain a final state of a protection group, the actuators are responsible for executing switching actions, and the protocol transmitter is responsible for transmitting protocol signaling.
To implement the method of using different linger timers for different paths, different linger timers may be enabled in each detector, as shown in fig. 4, where the linger timers are located in the detectors (only one linger timer is shown in fig. 4 for illustration and does not represent only one linger timer).
In the second method, the method for implementing nested protection includes the following steps:
the first step is to set the detector of the innermost path and set the timing time of its lingering timer to 0.
And in the second step, a detector of a secondary inner layer path is set, the timing time of a delay timer of the detector is set to be greater than or equal to M, M is the step length, and the protection switching of the inner layer within M time can be finished.
……
The Nth step sets the detector of the outgoing layer path to set the timing time of its linger timer to be greater than or equal to (N-1) M. N is the total number of layers.
And (N +1) configuring the protection groups of each layer.
Step N +2, when the detector of the path of the ith (i < N +1) layer detects that the fault changes, taking the fault generation as an example, by checking that the timing time of the delay timer of the layer of the detector is not 0, starting the delay timer of the layer, waiting for the time of (i-1) M, detecting whether the fault still exists after the timing time of the delay timer of the layer is up, if the fault still exists (the fault can be different from the fault reported initially), reporting the fault to a corresponding controller, and calculating by a protocol by the controller to obtain the state of a protection group and sending the state to an actuator for execution; otherwise if the fault does not exist, no action is taken.
The following two embodiments are used to specifically describe the application of the above two methods of the present invention, and the two embodiments are described in terms of the occurrence of a fault as a change in the occurrence of a fault, and the situation when the fault disappears is similar:
the embodiment of the first method comprises the following steps:
the method for implementing the protection nested stall timer by the controller is described by taking the protection nesting of fig. 5 as an example. In fig. 4, w denotes a working path and p denotes a protection path.
Fig. 5 is a schematic diagram of OCH1+1 protection working path nesting OTS1+1, where the client side is OCH1+1 protection, the service layer is OTS1+1 protection, and the OTS1+1 protection of the service layer is implemented only on the client side for the working path of OCH1+1 protection.
The first step is to configure the OTS1+1 protection group first, and the OTS1+1 protection group is located at the innermost layer, so that the timing times of the working path lingering timer for the OTS1+1 protection in the protection group controller and the lingering timer for the protection path are both set to 0.
And configuring an OCH1+1 protection group in the second step, wherein an OTS1+1 protection group is nested in a working path in the OCH1+1 protection group, and the protection path is not nested, so that the timing time of a work path lingering timer of OCH1+1 protection in a protection group controller is set to be T (T is not 0, T is greater than or equal to the time of completing protection switching of the nested OTS1+1 protection group), and the timing time of the lingering timer of the protection path is set to be 0.
Thirdly, when a fault occurs at a position 1 on a working path of the OTS1+1 protection group, both a detector of the OTS1+1 protection group and a detector of the OCH1+1 protection group detect an alarm and report the alarm to respective controllers, after receiving the alarm, the controller of the OTS1+1 protection group finds that the timing time of a delay timer of the working path is 0, and immediately calculates a protocol and obtains a state of a switching state; and after receiving the alarm, the controller of the OCH1+1 protection group starts the timer when finding that the timing time of the delay timer of the working path is T, and when the timing time T is up, the detector has no alarm, so that the protocol does not need to be entered and no processing is performed.
And fourthly, when a fault occurs at a position 2 on the protection path of the OCH1+1 protection group, a detector of the OCH1+1 protection group detects an alarm and reports the alarm to a controller of the detector, and the controller immediately enters protocol calculation after receiving the alarm and finds that the timing time of a delay timer of the working path is 0, so that the state of the protection group is in a working state.
Example of method two:
the method for implementing the protection nested linger timer by the detector is described by taking the protection nesting of fig. 5 as an example.
Fig. 5 is a schematic diagram of OCH1+1 protection working path nesting OTS1+1, where the client side is OCH1+1 protection, the service layer is OTS1+1 protection, and the OTS1+1 protection of the service layer is implemented only on the client side for the working path of OCH1+1 protection.
The first step is to configure the linger timer of the detector in the OTS1+1 protection domain, and the OTS1+1 protection group is located at the innermost layer, so the timing time of the linger timer of the detector in the OTS1+1 protection domain is set to 0.
And configuring a lingering timer of a detector in an OCH1+1 protection domain, wherein an OTS1+1 protection group is nested in a working path in the OCH1+1 protection group, and the protection path is not nested, so that the timing time of the lingering timer of the detector on the working path in the OCH1+1 protection domain (excluding the OTS1+1 protection domain) is set to be T (T is not 0), and the timing time of the lingering timer of the detector on the protection path is set to be 0.
Thirdly, when a fault occurs at the position 1 on the work path of the OTS1+1 protection group, the detector of the OTS1+1 protection group and the detector of the OCH1+1 protection group both detect an alarm, because the timing time of the detector delay timer of the OTS1+1 protection group is 0, the alarm is immediately reported to the controller, and the controller obtains the state of the protection group as a switching state through protocol calculation and sends the state to the actuator for execution; the timing time of the detector delay timer on the working path of the OCH1+1 protection group is T, so that the detector starts the delay timer, and when the timing time of the delay timer is up, no operation is performed, namely, no alarm is reported to the controller because the OTS1+1 protection group has been switched and the fault has disappeared.
Fourthly, when a fault occurs at a position 2 on a protection path of the OCH1+1 protection group, a detector of the OCH1+1 protection group detects an alarm, and the timing time of a delay timer of the detector of the OCH1+1 protection group on the protection path is 0, so that the alarm is immediately reported to a OCH1+1 protection group controller, and the controller enters protocol calculation to obtain that the state of the protection group is in an operating state.
The embodiment of the invention also provides a system for realizing nesting protection, which comprises:
lingering timers respectively corresponding to different paths in the protection group;
the setting module is used for respectively setting the lingering timers corresponding to different paths in the protection group, setting the timing time of the lingering timer corresponding to the innermost path as a specific value, and setting the timing time of the lingering timer corresponding to the outer path as a value larger than the specific value;
the execution module is used for acquiring the timing time of a delay timer corresponding to a path where the position where the fault changes when the fault changes is detected, and calculating the state of the protection group when the acquired timing time is the specific value; and when the acquired timing time is not the specific value, starting a lingering timer corresponding to a path where the fault changes, detecting whether the change of the fault is unchanged or not again after the timing time of the lingering timer is reached, and calculating the state of the protection group when the change of the fault is not changed.
Wherein, the innermost layer path is a path which does not contain other protection groups; the outer layer path is a path which comprises other protection groups;
the setting, by the setting module, setting the timing time of the lingering timer corresponding to the outer layer path to be greater than the specific value may be:
the setting module sets the timing time of the lingering timer corresponding to the outer layer path to be T1+ T2; t1 is the maximum value of the timing time of the linger timer corresponding to each path in the protection group included in the outer path; t2 is greater than or equal to the time for the included protection group to complete protection switching.
Wherein the specific value may be 0.
The linger timer and the execution module may be located in a controller of the protection system.
Each of the lingering timers may be respectively located in a detector of a corresponding path in the protection system;
the detectors of each path may be respectively provided with one of the execution modules;
the execution module calculating the protection group state may refer to:
and the execution module reports the change of the fault to a controller of the protection system, and the controller calculates the state of the protection group.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A method of implementing nested protection, comprising:
respectively setting delay timers corresponding to different paths in the protection group, setting the timing time of the delay timer corresponding to the innermost path to a specific value, and setting the timing time of the delay timer corresponding to the outer path to be greater than the specific value;
when the fault change is detected, acquiring the timing time of a delay timer corresponding to a path where the fault change position is located, and calculating the state of a protection group when the acquired timing time is the specific value; when the acquired timing time is not the specific value, starting a lingering timer corresponding to a path where the position where the fault changes, detecting whether the change of the fault is unchanged or not again after the timing time of the lingering timer is reached, and calculating the state of a protection group when the change of the fault is not changed; wherein the content of the first and second substances,
the innermost layer path is a path which does not contain other protection groups; the outer layer path is a path which comprises other protection groups;
the setting the timing time of the linger timer corresponding to the outer layer path to be greater than the specific value comprises:
setting the timing time of a lingering timer corresponding to the outer layer path as T1+ T2; t1 is the maximum value of the timing time of the linger timer corresponding to each path in the protection group included in the outer path; t2 is greater than or equal to the time for the included protection group to complete protection switching.
2. The method of claim 1, wherein:
the particular value is 0.
3. The method of claim 1, wherein:
the linger timer is located in a controller of the protection system.
4. The method of claim 1, wherein:
each delay timer is respectively positioned in a detector of a corresponding path in the protection system;
the compute protected group state includes:
and the detector reports the change of the fault to a controller in the protection system, and the controller calculates the state of the protection group.
5. A system for implementing nested protection, comprising:
lingering timers respectively corresponding to different paths in the protection group;
the setting module is used for respectively setting the lingering timers corresponding to different paths in the protection group, setting the timing time of the lingering timer corresponding to the innermost path as a specific value, and setting the timing time of the lingering timer corresponding to the outer path as a value larger than the specific value;
the execution module is used for acquiring the timing time of a delay timer corresponding to a path where the position where the fault changes when the fault changes is detected, and calculating the state of the protection group when the acquired timing time is the specific value; when the acquired timing time is not the specific value, starting a lingering timer corresponding to a path where the position where the fault changes, detecting whether the change of the fault is unchanged or not again after the timing time of the lingering timer is reached, and calculating the state of a protection group when the change of the fault is not changed; wherein the content of the first and second substances,
the innermost layer path is a path which does not contain other protection groups; the outer layer path is a path which comprises other protection groups;
the setting module sets the timing time of the lingering timer corresponding to the outer layer path to be greater than the specific value, namely:
the setting module sets the timing time of the lingering timer corresponding to the outer layer path to be T1+ T2; t1 is the maximum value of the timing time of the linger timer corresponding to each path in the protection group included in the outer path; t2 is greater than or equal to the time for the included protection group to complete protection switching.
6. The system of claim 5, wherein:
the particular value is 0.
7. The system of claim 5, wherein:
the lingering timer and the execution module are located in a controller of the protection system.
8. The system of claim 5, wherein:
each delay timer is respectively positioned in a detector of a corresponding path in the protection system;
the detectors of each path are respectively provided with one execution module;
the execution module calculates the protection group state by:
and the execution module reports the change of the fault to a controller of the protection system, and the controller calculates the state of the protection group.
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| CN201410812355.0A CN105792028B (en) | 2014-12-23 | 2014-12-23 | Method and system for realizing nesting protection |
| PCT/CN2015/097579 WO2016101826A1 (en) | 2014-12-23 | 2015-12-16 | Method and system for implementing nested protection |
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| CN201410812355.0A CN105792028B (en) | 2014-12-23 | 2014-12-23 | Method and system for realizing nesting protection |
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| CN115174363B (en) * | 2022-07-05 | 2024-04-12 | 云合智网(上海)技术有限公司 | Multi-protection group set fast switching method |
| CN115623364A (en) * | 2022-09-08 | 2023-01-17 | 烽火通信科技股份有限公司 | Method and system for IP and optical network protection switching cooperative management and control |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101499820A (en) * | 2008-02-01 | 2009-08-05 | 华为技术有限公司 | Protection method for service transmission and network appliance |
| CN101616344A (en) * | 2009-06-17 | 2009-12-30 | 中兴通讯股份有限公司 | Service protecting method and device based on ASON |
| CN102118301A (en) * | 2009-12-31 | 2011-07-06 | 中兴通讯股份有限公司 | Tunnel protection method and device |
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| US8958701B2 (en) * | 2012-12-27 | 2015-02-17 | Ciena Corporation | Methods and systems of preserving client overhead bytes in optical transport network tunneling applications |
| CN103152094B (en) * | 2013-03-05 | 2015-04-15 | 烽火通信科技股份有限公司 | Multilayer protection switching method and device in optical network |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101499820A (en) * | 2008-02-01 | 2009-08-05 | 华为技术有限公司 | Protection method for service transmission and network appliance |
| CN101616344A (en) * | 2009-06-17 | 2009-12-30 | 中兴通讯股份有限公司 | Service protecting method and device based on ASON |
| CN102118301A (en) * | 2009-12-31 | 2011-07-06 | 中兴通讯股份有限公司 | Tunnel protection method and device |
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