CN112994785A - Service recovery method and device - Google Patents
Service recovery method and device Download PDFInfo
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- CN112994785A CN112994785A CN201911309459.9A CN201911309459A CN112994785A CN 112994785 A CN112994785 A CN 112994785A CN 201911309459 A CN201911309459 A CN 201911309459A CN 112994785 A CN112994785 A CN 112994785A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/021—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0267—Optical signaling or routing
- H04J14/0271—Impairment aware routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0272—Transmission of OAMP information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0005—Switch and router aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
- H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The disclosure provides a service recovery method and a service recovery device, and relates to the field of communication. The embodiment of the disclosure recovers each transmission link of the service group in batch by taking the service group as a unit, reduces the frequency of network topology change in the transmission link recovery process, and further improves the problem of data routing oscillation or network congestion of the IP network caused by the frequency.
Description
Technical Field
The present disclosure relates to the field of communications, and in particular, to a method and an apparatus for service restoration.
Background
A ROADM (Reconfigurable Optical Add-Drop Multiplexer) network is an intelligent Optical network, automatically routes, realizes the establishment and the removal of connection by signaling control, and is a new-generation Optical network integrating exchange and transmission.
In a WSON (Wavelength Switched Optical Network) or an ASON (automatic Switched Optical Network) in the current ROADM, a mode of recovering transmission links one by one is adopted, that is, the transmission links are recovered one by one according to the resource availability. However, for an IP (Internet Protocol) layer device, each transmission link recovery causes a network topology change, and a plurality of transmission links recovery causes a plurality of network topology changes. The network topology changes frequently, which may cause data routing oscillation or network congestion of the IP network.
Disclosure of Invention
The embodiment of the disclosure recovers each transmission link of the service group in batch by taking the service group as a unit, reduces the frequency of network topology change in the transmission link recovery process, and further improves the problem of data routing oscillation or network congestion of the IP network caused by the frequency.
Some embodiments of the present disclosure provide a service recovery method, including:
detecting whether at least part of transmission links of a service group are failed;
if the fault occurs, judging whether the total available bandwidth of the current available transmission link of the service group is smaller than a preset bandwidth;
if the bandwidth is less than the preset bandwidth, inserting an unavailable alarm into the current available transmission link of the service group at the client side;
and if the bandwidth is larger than or equal to the preset bandwidth, inserting a link recovery indication into the current available transmission link of the service group at the client side.
In some embodiments, the step of determining comprises: if a preset event occurs, judging whether the total available bandwidth of the current available transmission link of the service group is less than a preset bandwidth or not,
the preset event comprises that an available transmission link corresponding to a service group changes or a preset bandwidth corresponding to the service group changes.
In some embodiments, further comprising: in the event of a failure, one or more of recovering the failed transmission link and finding an available transmission link is performed.
In some embodiments, the currently available transmission links of the service group include: and the failed and recovered transmission link does not appear in the service group.
In some embodiments, the predetermined bandwidth is configured according to traffic needs of an internet protocol, IP, layer.
In some embodiments, the physical route corresponding to the transmission link is determined according to the shortest physical route found by a wavelength switched optical network WSON protocol.
In some embodiments, the traffic restoration method is used in an optical network.
Some embodiments of the present disclosure provide a service recovery apparatus, including:
a failure detection module configured to detect whether at least a portion of transmission links of a service group fail;
the judging module is configured to judge whether the total available bandwidth of the current available transmission link of the service group is smaller than a preset bandwidth or not if a fault occurs;
the link control module is configured to insert an unavailable alarm into a currently available transmission link of the service group on the client side if the bandwidth is less than a preset bandwidth; and if the bandwidth is larger than or equal to the preset bandwidth, inserting a link recovery indication into the current available transmission link of the service group at the client side.
In some embodiments, further comprising: a link recovery module configured to perform one or more of recovering the failed transmission link and finding an available transmission link if the failure occurs.
Some embodiments of the present disclosure provide a service recovery apparatus, including:
a memory; and
a processor coupled to the memory, the processor configured to perform the traffic restoration method of any of the embodiments based on instructions stored in the memory.
Some embodiments of the present disclosure provide a reconfigurable optical add-drop multiplexer ROADM, comprising: the traffic restoration apparatus according to any one of the embodiments.
Some embodiments of the present disclosure propose a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the traffic restoration method described in any one of the embodiments.
Drawings
The drawings that will be used in the description of the embodiments or the related art will be briefly described below. The present disclosure will be more clearly understood from the following detailed description, which proceeds with reference to the accompanying drawings,
it is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without undue inventive faculty.
Fig. 1 is a schematic diagram of an optical network deployment with bulk recovery in some embodiments of the present disclosure.
Fig. 2 is a flow chart illustrating a service restoration method according to some embodiments of the present disclosure.
Fig. 3 is a schematic diagram of a service restoration apparatus in some embodiments of the present disclosure.
Fig. 4 is a schematic diagram of a service restoration apparatus according to another embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure.
The embodiment of the disclosure recovers each transmission link of the service group in batch by taking the service group as a unit, reduces the frequency of network topology change in the transmission link recovery process, and further improves the problem of data routing oscillation or network congestion of the IP network caused by the frequency.
Fig. 1 is a schematic diagram of an optical network deployment with bulk recovery in some embodiments of the present disclosure.
As shown in fig. 1, the optical network includes a plurality of ROADM nodes and a plurality of IP devices, and the ROADM nodes are connected with the IP devices or other ROADM nodes to jointly construct the optical network. For example, ROADM node a is connected with IP device A, ROADM, node B, and ROADM node C; ROADM node Z is connected to IP device Z, ROADM, node B, and ROADM node C. It can be seen that transmission link failure and recovery can cause network topology changes. A traffic restoration device is provided at the ROADM node, in particular at the ROADM node connected to the IP device. The service restoration method implemented by the service restoration apparatus is described below.
Fig. 2 is a flow chart illustrating a service restoration method according to some embodiments of the present disclosure. The method may be performed by a traffic restoration device, for example.
As shown in fig. 2, the service recovery method of this embodiment includes:
in step 20, it is assumed that a service group (SGn) in a certain office direction is created on a certain source ROADM node a, and it is assumed that the service group SGn has N transmission links, the bandwidth sum of which is Y Gbit/s, and the bottom layer physical route corresponding to the N transmission links can search for the shortest physical route according to the WSON protocol. These transmission links may correspond to a common physical route or to different physical routes.
At step 21 a traffic restoration device is set up on the source ROADM node a. The service restoration apparatus detects whether at least part of transmission links of a service group fail.
In step 22, if a failure occurs, one or more of recovering the failed transmission link and finding available transmission links are performed to recover the traffic.
According to the resource availability, a distributed or centralized algorithm is adopted to find available transmission links, and the link performance is calculated according to indexes such as OSNR (Optical Signal Noise Ratio) and the like, so that the end-to-end accessibility of the link is ensured.
In step 23, if a failure occurs, it is determined whether the total available bandwidth of the currently available transmission links of the service group is less than a preset bandwidth.
The judging step comprises the following steps: and if the preset event occurs, judging whether the total available bandwidth of the current available transmission link of the service group is smaller than the preset bandwidth. The preset event includes a change of an available transmission link corresponding to the service group (for example, a link corresponding to the service group fails, recovers, joins a new link, or the like), or a change of a preset bandwidth corresponding to the service group. For example, for a service group, when at least a part of links corresponding to the service group fail, the determining step is executed, and subsequently, when the failed link corresponding to the service group is recovered or a new link is found for the service group, the determining step is executed again.
The currently available transmission links for the service group include: the failed and recovered transmission links in the service group do not occur.
The preset bandwidth is the minimum bandwidth configured according to the service requirement of the IP layer, and can meet the service requirement of the IP layer.
The total available bandwidth of the currently available transmission link of the service group detected in the current detection period is assumed to be xGbit/s, and the preset bandwidth is assumed to be Z Gbit/s.
In step 24, if x is smaller than the preset bandwidth Z, an unavailable alarm is inserted into the currently available transmission link of the service group on the client side, so that the IP layer device actively interrupts the transmission link which is available but does not meet the service bearing requirement.
In step 25, if x is greater than or equal to the preset bandwidth Z, a link recovery indication is inserted into the currently available transmission link of the service group on the client side to eliminate the unavailable alarm, so as to recover each transmission link of the service group in batch.
By taking the service group as a unit and recovering each transmission link of the service group in batches, the frequency of network topology change is reduced in the transmission link recovery process, and the problem of data routing oscillation or network congestion of the IP network caused by the frequency is further improved.
In each local direction of the current IP backbone network, networking is performed through double routes, and the length of the optical cable of the second route is usually much longer than that of the optical cable of the first route. If the optimal single-route networking is adopted, the network access time delay can be effectively reduced. When a fault occurs, in order to avoid network congestion caused by the fact that the available IP broadband is far smaller than the planned bandwidth when a certain office is networked by a single route, the ROADM node can support and adopt the batch routing service recovery method disclosed by the invention.
Fig. 3 is a schematic diagram of a service restoration apparatus in some embodiments of the present disclosure.
As shown in fig. 3, the traffic restoration apparatus 30 of this embodiment includes: a service group creating module 31, a failure detecting module 32, a link recovering module 33, a judging module 34, a link control module 35 and the like.
A service group creation module 31 configured to create a service group. One service group corresponds to a plurality of transmission links, and one transmission link corresponds to the bottom layer physical route.
A failure detection module 32 configured to detect whether at least part of the transmission links of a service group fail.
A link recovery module 33 configured to perform one or more of recovering the failed transmission link and finding an available transmission link if a failure occurs.
A determining module 34 configured to determine whether a total available bandwidth of currently available transmission links of the service group is less than a preset bandwidth if a failure occurs. Wherein, if the preset event occurs, the judging step is executed. The preset event includes a change of an available transmission link corresponding to the service group (e.g., a link failure, a recovery, a new link, etc. corresponding to the service group), or a change of a preset bandwidth corresponding to the service group
A link control module 35 configured to insert an unavailable alarm to a currently available transmission link of the service group on the client side if the bandwidth is less than a preset bandwidth; and if the bandwidth is larger than or equal to the preset bandwidth, inserting a link recovery indication into the current available transmission link of the service group at the client side.
The working process of each module is as follows:
first, the service group creation module 31 creates a service group SGn for a certain office. Assuming that the service group SGn has N transmission links, the bandwidth of which is Y Gbit/s in total, and the bottom physical route corresponding to the N transmission links can search for the shortest physical route according to the WSON protocol. These transmission links may correspond to a common physical route or to different physical routes.
Next, when a network failure causes a failure of some or all of the links, the failure detection module 32 may detect a failure of each transmission link and pass the failure information to the link recovery module 33.
The link recovery module 33 then attempts to recover the failed transmission link or to find a new available transmission link to ensure that the link recovery is end-to-end reachable.
Next, the determining module 34 determines comprehensively whether the total available bandwidth x Gbit/s of the currently available transmission link of the service group SGn is smaller than the preset minimum bandwidth Z Gbit/s according to the information of the fault detecting module 32 and the link recovering module 33.
Next, if the link control module 35 determines that x is smaller than the minimum bandwidth Z, insert an unavailable alarm into the currently available transmission link of the service group on the client side; and if the x is larger than or equal to the minimum bandwidth Z, inserting a link recovery indication into the currently available transmission link of the service group at the client side to eliminate the unavailable alarm, thereby recovering each transmission link of the service group in batch.
Fig. 4 is a schematic diagram of a service restoration apparatus according to another embodiment of the present disclosure.
As shown in fig. 4, the traffic restoration apparatus 40 of this embodiment includes: a memory 41 and a processor 42 coupled to the memory 41, the processor 42 being configured to execute the traffic restoration method in any of the embodiments described above based on instructions stored in the memory 41.
The memory 41 may include, for example, a system memory, a fixed nonvolatile storage medium, and the like. The system memory stores, for example, an operating system, an application program, a Boot Loader (Boot Loader), and other programs.
The traffic restoration apparatus 40 may further include an input-output interface 43, a network interface 44, a storage interface 45, and the like. These interfaces 43, 44, 45 and the connection between the memory 41 and the processor 42 may be, for example, via a bus 46. The input/output interface 43 provides a connection interface for input/output devices such as a display, a mouse, a keyboard, and a touch screen. The network interface 44 provides a connection interface for various networking devices. The storage interface 45 provides a connection interface for external storage devices such as an SD card and a usb disk.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only exemplary of the present disclosure and is not intended to limit the present disclosure, so that any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (12)
1. A method for service restoration, comprising:
detecting whether at least part of transmission links of a service group are failed;
if the fault occurs, judging whether the total available bandwidth of the current available transmission link of the service group is smaller than a preset bandwidth;
if the bandwidth is less than the preset bandwidth, inserting an unavailable alarm into the current available transmission link of the service group at the client side;
and if the bandwidth is larger than or equal to the preset bandwidth, inserting a link recovery indication into the current available transmission link of the service group at the client side.
2. The method of claim 1,
the step of judging comprises: if a preset event occurs, judging whether the total available bandwidth of the current available transmission link of the service group is less than a preset bandwidth or not,
the preset event comprises that an available transmission link corresponding to a service group changes or a preset bandwidth corresponding to the service group changes.
3. The method of claim 1, further comprising:
in the event of a failure, one or more of recovering the failed transmission link and finding an available transmission link is performed.
4. The method of claim 1,
the currently available transmission links of the service group include: and the failed and recovered transmission link does not appear in the service group.
5. The method of claim 1,
the preset bandwidth is configured according to the service requirement of an Internet Protocol (IP) layer.
6. The method of claim 1,
and the physical route corresponding to the transmission link is determined according to the shortest physical route searched by the WSON protocol.
7. The method of claim 1,
the service recovery method is used for an optical network.
8. A service restoration apparatus, comprising:
a failure detection module configured to detect whether at least a portion of transmission links of a service group fail;
the judging module is configured to judge whether the total available bandwidth of the current available transmission link of the service group is smaller than a preset bandwidth or not if a fault occurs;
the link control module is configured to insert an unavailable alarm into a currently available transmission link of the service group on the client side if the bandwidth is less than a preset bandwidth; and if the bandwidth is larger than or equal to the preset bandwidth, inserting a link recovery indication into the current available transmission link of the service group at the client side.
9. The apparatus of claim 8, further comprising:
a link recovery module configured to perform one or more of recovering the failed transmission link and finding an available transmission link if the failure occurs.
10. A service restoration apparatus, comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the traffic restoration method of any of claims 1-7 based on instructions stored in the memory.
11. A reconfigurable optical add-drop multiplexer, ROADM, comprising:
a traffic restoration device as claimed in any one of claims 8 to 10.
12. A non-transitory computer readable storage medium, having stored thereon a computer program which, when executed by a processor, carries out the steps of the traffic restoration method of any of claims 1-7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911309459.9A CN112994785A (en) | 2019-12-18 | 2019-12-18 | Service recovery method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911309459.9A CN112994785A (en) | 2019-12-18 | 2019-12-18 | Service recovery method and device |
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| CN112994785A true CN112994785A (en) | 2021-06-18 |
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| CN201911309459.9A Pending CN112994785A (en) | 2019-12-18 | 2019-12-18 | Service recovery method and device |
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Application publication date: 20210618 |