CN112583474B - Multi-path rapid switching system and method for optical network - Google Patents
Multi-path rapid switching system and method for optical network Download PDFInfo
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Abstract
The invention discloses a multipath rapid switching system and method of an optical network, comprising input end network equipment, output end network equipment and N service paths; business data is input by an input port of the input end network equipment; the N service paths are connected between an output port of the input end network equipment and an input port of the output end network equipment, wherein 1 network line is a working path, the rest at least M network lines are protection paths, and the network paths have three working modes of static, dynamic and dynamic combination; the service data is output by the output port of the output end network device. The invention can realize uninterrupted communication of service when the network circuit fails once, twice or even multiple times, and can ensure that the path switching time meets the requirement of a carrier class of 50 ms. The invention can be widely used in the optical network, greatly improves the reliability and the destruction resistance of the optical network, solves the problem of interruption of service when the current line fails for more than one time, and effectively improves the reliability of the network.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to a system and a method for rapidly switching optical network multipaths.
Background
The existing communications device LSP (Label SWITCH PATH, label switched path) protection is typically 1:1,1+1,1: n, there is only one protection path of the protection method, which only supports one-degree fault of the line, but cannot support more than one-degree fault of the line. When the working path fails (one-time failure), the protection path is switched to, and when the protection path fails (more than one-time failure), the conventional LSP protection scheme cannot be used, the service is interrupted, and the service can be restored to be normal only after the line failure is removed.
Disclosure of Invention
The invention aims to solve the problem that the conventional communication equipment LSP only supports one-time fault, and provides a system and a method for rapidly switching optical network multipaths.
In order to solve the problems, the invention is realized by the following technical scheme:
An optical network multipath rapid switching system comprises an input end network device, an output end network device and N service paths; business data is input by an input port of the input end network equipment; the N service paths are connected between the output port of the input end network device and the input port of the output end network device; wherein 1+M business paths are positioned in a tunnel protection group of the system, and 1 business path in the tunnel protection group of the system is a working path; the N- (1+M) service paths are positioned outside the tunnel protection group of the system; the business data is output by the output port of the output end network equipment; the business data is output by the output port of the output end network equipment; m and N are positive integers, N is more than or equal to M+1, and M is more than or equal to 1.
The N traffic paths have different weights.
The M service paths are static service paths or dynamic service paths, wherein the weight of the static service paths is always higher than that of the dynamic protection paths.
The working modes of the system comprise a static working mode, a dynamic working mode or a dynamic and static combined working mode:
① In a static working mode, defining 1 initial working path and M static protection paths in M service paths of a tunnel protection group of a system; when the current working path fails, the service path in the tunnel protection group of the system is kept unchanged, and the working path between the output port of the input end network equipment and the input port of the output end network equipment is switched to a static protection path which does not fail and has priority weight next to the current working path;
② In a dynamic working mode, defining 1 initial working path and M dynamic protection paths in M service paths of a tunnel protection group of a system; when the current working path fails, the current working path is moved out of the tunnel protection group of the system, and meanwhile, a new available service path is added into the tunnel protection group of the system as a dynamic protection path, and the working path between the output port of the input end network equipment and the input port of the output end network equipment is switched to the next dynamic protection path which does not fail and has priority weight;
③ Under the dynamic and static combined working mode, defining 1 initial working path, L static protection paths and M-L dynamic working paths in M service paths of a tunnel protection group of a system;
When the current working path fails and the current working path is an initial working path or a static protection path with the lowest weight, the service path in the tunnel protection group of the system is kept unchanged, and the working path between the output port of the input end network equipment and the input port of the output end network equipment is switched to the next static protection path with the highest weight and no failure of the current working path;
When the current working path fails and the current working path is the static protection path with the lowest weight, the initial working path is moved out of the tunnel protection group of the system, and simultaneously a new available service path is added into the tunnel protection group of the system as a dynamic protection path, and the working path between the output port of the input end network equipment and the input port of the output end network equipment is switched into the dynamic protection path with the highest weight;
When the current working path fails and the current working path is a dynamic protection path, the current working path is moved out of a tunnel protection group of the system, and meanwhile, a new available service path is added into the tunnel protection group of the system as the dynamic protection path, and the working path between an output port of the input end network equipment and an input port of the output end network equipment is switched to a dynamic protection path which does not fail and has priority weight next to the current working path;
Wherein M and L are positive integers, M is more than L, and L is more than or equal to 1.
In order to ensure that the switching time meets the requirements of the carrier class, the current working path and the next working path to be switched are simultaneously positioned in an APS protection group of the system.
When the line fault is recovered in the static working mode, the dynamic working mode or the dynamic and static combined working mode, the initial working path is switched back preferentially between the output port of the input end network equipment and the input port of the output end network equipment, and the protection path is switched back according to the weight.
Compared with the prior art, the invention can realize uninterrupted communication of the service when the network circuit fails once, twice or even multiple times, and can ensure that the path switching time meets the requirement of a carrier class of 50 ms. The invention can be widely used in the optical network, greatly improves the reliability and the destruction resistance of the optical network, solves the problem of interruption of service when the current line fails for more than one time, and effectively improves the reliability of the network.
Drawings
Fig. 1 is a schematic diagram of an optical network multipath fast switching system.
Fig. 2 is a schematic diagram of a static operation mode of the optical network multipath rapid switching system.
Fig. 3 is a schematic diagram of a dynamic operation mode of the optical network multipath rapid switching system.
Fig. 4 is a schematic diagram of dynamic and static combination operation modes of the optical network multipath rapid switching system.
Detailed Description
The present invention will be further described in detail with reference to specific examples in order to make the objects, technical solutions and advantages of the present invention more apparent.
For simplicity of description, we use 3:1 (i.e. 3 protection paths and 1 working path) are illustrated as an example, and according to the same principle we can easily implement N:1 (i.e. N protection paths and 1 working path).
An optical network multi-path rapid switching system (3:1 optical network multi-path rapid switching system) is shown in fig. 1, and comprises an input end network device, an output end network device and more than 4 service paths. The service data is input by an input port of the input network device. More than 4 traffic paths are connected between the output port of the input network device and the input port of the output network device. Among the N service paths, 4 service paths are located in a tunnel protection group of the system, wherein 1 service path is a working path, the other 3 service paths are protection paths, and the 3 protection paths are provided with different weights. The service data is output by the output port of the output end network device.
At 3:1, the service enters the port of the input end network equipment from the port and is transmitted to the port of the output end network equipment. There are 4 traffic paths between the input network device and the output network device, LSP1, LSP2, LSP3 and LSP4, respectively. All of the 4 traffic paths are located in a tunnel protection group of the system, wherein LSP1 is an initial working path, LSP2, LSP3 and LSP4 are 3 protection paths, and the 3 protection paths are switched for protection according to weights set by the system. The 3 protection paths may be defined as static protection paths and/or dynamic protection paths, where the static protection paths are located in the tunnel protection group of the system when the static protection paths are the dynamic protection paths, and where the dynamic protection paths are located in the tunnel protection group of the system when the dynamic protection paths are the dynamic protection paths. The weight of each protection path can be set manually, or can be calculated according to the real-time link quality (bandwidth, jitter, time delay, etc.) of the service path, and the protection path weight with good link quality is prioritized, and the weight of the static protection path is higher than that of the dynamic protection path.
3 Above: 1, an optical network multipath rapid switching method implemented by an optical network multipath rapid switching system, the working mode of which comprises: static operation mode, dynamic operation mode, and static and dynamic combined operation mode:
(1) Static mode of operation:
Initially, traffic path LSP1 is the initial working path, traffic paths LSP2, LSP3, and LSP4 are static protection paths, where traffic paths LSP1, LSP2, LSP3, and LSP4 are in the tunnel protection group of the system and traffic paths LSP1 and LSP2 are in the APS protection group of the system (see fig. 2 a).
When the current working path LSP1 fails, a switch is made between the output port of the input end network device and the input port of the output end network device to the traffic path LSP2, so that the traffic path LSP2 becomes the working path, at this time, the traffic paths LSP1, LSP2, LSP3 and LSP4 are in the tunnel protection group of the system, and the traffic paths LSP2 and LSP3 are located in the APS protection group of the system (see fig. 2 b).
When the current working path LSP2 fails, a switch is made between the output port of the input end network device and the input port of the output end network device to the traffic path LSP3, so that the traffic path LSP3 becomes the working path, at this time, the traffic paths LSP1, LSP2, LSP3 and LSP4 are in the tunnel protection group of the system, and the traffic paths LSP3 and LSP4 are located in the APS protection group of the system (see fig. 2 c).
When the current working path LSP3 fails, a switch is made between the output port of the input end network device and the input port of the output end network device to the traffic path LSP4, so that the traffic path LSP4 becomes the working path, at this time, the traffic paths LSP1, LSP2, LSP3 and LSP4 are in the tunnel protection group of the system, and the traffic paths LSP4 and LSP1 are in the APS protection group of the system (see fig. 2 d).
When the line fault is recovered, the initial working path is switched back preferentially between the output port of the input end network equipment and the input port of the output end network equipment, and the protection path is switched back according to the weight.
In the static mode of operation, the 4 traffic paths LSP1, LSP2, LSP3, and LSP4 are always in the tunnel protection group of the system. Thus, the service can realize 3-degree fault protection of the line.
(2) Dynamic operation mode:
Initially, traffic path LSP1 is the initial working path, traffic paths LSP2, LSP3, and LSP4 are dynamic protection paths, where traffic paths LSP1, LSP2, LSP3, and LSP4 are in the tunnel protection group of the system and traffic paths LSP1 and LSP2 are in the APS protection group of the system (see fig. 3 a).
When the current working path LSP1 fails, the current working path LSP1 is moved out of the tunnel protection group of the system, a new available service path LSP5 is added as a dynamic protection path in the tunnel protection group of the system, and the output port of the input end network device and the input port of the output end network device are switched to the service path LSP2, so that the service path LSP2 becomes a working path, at this time, 4 of the service paths LSP2, LSP3, LSP4 and LSP5 are in the tunnel protection group of the system, and the service paths LSP2 and LSP3 are located in the APS protection group of the system (see fig. 3 b).
When the current working path LSP2 fails, the current working path LSP2 is moved out of the tunnel protection group of the system, a new available service path LSP6 is added as a dynamic protection path in the tunnel protection group of the system, and the output port of the input end network device and the input port of the output end network device are switched to the service path LSP3, so that the service path LSP3 becomes a working path, at this time, the service paths LSP3, LSP4, LSP5 and LSP6 are in the tunnel protection group of the system, and the service paths LSP3 and LSP4 are located in the APS protection group of the system (see fig. 3 c).
When the current working path LSP3 fails, the current working path LSP3 is moved out of the tunnel protection group of the system, a new available service path LSP7 is added as a dynamic protection path in the tunnel protection group of the system, and the output port of the input end network device and the input port of the output end network device are switched to the service path LSP4, so that the service path LSP4 becomes the working path, at this time, the service paths LSP4, LSP5, LSP3 and LSP7 are in the tunnel protection group of the system, and the service paths LSP4 and LSP5 are located in the APS protection group of the system (see fig. 3 d).
When the line fault is recovered, the initial working path is switched back preferentially between the output port of the input end network equipment and the input port of the output end network equipment, and the protection path is switched back according to the weight.
In the dynamic mode of operation, if there is a new available traffic path, the failed traffic path is moved out of the tunnel protection group of the system and replaced by the new available traffic path joining the tunnel protection group of the system. This has the advantage that traffic communication is guaranteed as long as there is an available path between the input network device and the output network device.
(3) Dynamic and static combined mode of operation:
taking 2 paths LSP2, LSP3 as static and 1 path LSP4 as dynamic as an example.
Initially, traffic path LSP1 is the initial working path, traffic paths LSP2 and LSP3 are static protection paths, traffic path LSP4 is the dynamic protection path, traffic paths LSP1, LSP2 and LSP3 and LSP4 are in the tunnel protection group of the system, and traffic paths LSP1 and LSP2 are in the APS protection group of the system (see fig. 4 a).
When the current working path LSP1 fails, a switch is made between the output port of the input end network device and the input port of the output end network device to the traffic path LSP2, so that the traffic path LSP2 becomes the working path, at this time, the traffic paths LSP1, LSP2, LSP3 and LSP4 are in the tunnel protection group of the system, and the traffic paths LSP2 and LSP3 are located in the APS protection group of the system (see fig. 4 b).
When the current working path LSP2 fails, the output port of the input end network device and the input port of the output end network device switch to the service path LSP3, so that the service path LSP3 becomes the working path, at this time, the service paths LSP1, LSP2, LSP3 and LSP4 are in the tunnel protection group of the system, and the service paths LSP3 and LSP4 are in the APS protection group of the system (see fig. 4 c).
When the current working path LSP3 fails, the output port of the input end network equipment and the input port of the output end network equipment are switched to the service path LSP4, so that the service path LSP4 is changed into a working path, LSP1 is moved out of the protection group, and a new available service path LSP5 is added into the system protection group to serve as a dynamic protection path. Traffic paths LSP2, LSP3, LSP4, and LSP5 are now in the tunnel protection group of the system, and traffic paths LSP4 and LSP5 are in the APS protection group of the system (see FIG. 4 d).
When the line fault is recovered, the initial working path is switched back preferentially between the output port of the input end network equipment and the input port of the output end network equipment, and the protection path is switched back according to the weight.
In the working mode of combining the dynamic and the static, the protection path set in the static working mode is always existed, and the protection path set in the dynamic working mode may be moved out of the tunnel protection group of the system. The weight of the static protection path is always higher than that of the dynamic protection path.
It should be noted that, although the examples described above are illustrative, this is not a limitation of the present invention, and thus the present invention is not limited to the above-described specific embodiments. Other embodiments, which are apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein, are considered to be within the scope of the invention as claimed.
Claims (5)
1. An optical network multipath rapid switching method realized by an optical network multipath rapid switching system comprises an input end network device, an output end network device and N service paths; business data is input by an input port of the input end network equipment; the N service paths are connected between the output port of the input end network device and the input port of the output end network device; wherein 1+M business paths are positioned in a tunnel protection group of the system, and 1 business path in the tunnel protection group of the system is a working path; the N- (1+M) service paths are positioned outside the tunnel protection group of the system; the business data is output by the output port of the output end network equipment; the system is characterized in that the working modes of the system comprise a static working mode, a dynamic working mode and a dynamic and static combined working mode;
In a static working mode, 1 initial working paths and M static protection paths are included in 1+M service paths of a tunnel protection group of a definition system; when the current working path fails, the service path in the tunnel protection group of the system is kept unchanged, and the working path between the output port of the input end network equipment and the input port of the output end network equipment is switched to a static protection path which does not fail and has priority weight next to the current working path;
in a dynamic working mode, 1+M service paths of a tunnel protection group of a defined system comprise 1 initial working path and M dynamic protection paths; when the current working path fails, the current working path is moved out of the tunnel protection group of the system, and meanwhile, a new available service path is added into the tunnel protection group of the system as a dynamic protection path, and the working path between the output port of the input end network equipment and the input port of the output end network equipment is switched to the next dynamic protection path which does not fail and has priority weight;
under the dynamic and static combined working mode, 1+M service paths of a tunnel protection group of the definition system comprise 1 initial working path, L static protection paths and M-L dynamic working paths;
When the current working path fails and the current working path is an initial working path or a static protection path with the lowest weight, the service path in the tunnel protection group of the system is kept unchanged, and the working path between the output port of the input end network equipment and the input port of the output end network equipment is switched to the next static protection path with the highest weight and no failure of the current working path;
When the current working path fails and the current working path is the static protection path with the lowest weight, the initial working path is moved out of the tunnel protection group of the system, and simultaneously a new available service path is added into the tunnel protection group of the system as a dynamic protection path, and the working path between the output port of the input end network equipment and the input port of the output end network equipment is switched into the dynamic protection path with the highest weight;
When the current working path fails and the current working path is a dynamic protection path, the current working path is moved out of a tunnel protection group of the system, and meanwhile, a new available service path is added into the tunnel protection group of the system as the dynamic protection path, and the working path between an output port of the input end network equipment and an input port of the output end network equipment is switched to a dynamic protection path which does not fail and has priority weight next to the current working path;
m, N and L are positive integers, N is more than or equal to M+1, M is more than or equal to 1, M is more than or equal to L, and L is more than or equal to 1.
2. The method of claim 1, wherein the current working path and the next working path to be switched are simultaneously located in an APS protection group of the system.
3. The method for fast switching over multiple paths of an optical network according to claim 1, wherein in a static operation mode, a dynamic operation mode or a dynamic and static combination operation mode, when a line fault is recovered, an initial operation path is switched back preferentially between an output port of an input end network device and an input port of an output end network device, and a protection path is switched back according to a weight.
4. The method of claim 1, wherein the N traffic paths have different weights.
5. The method of claim 1, wherein the M traffic paths are static traffic paths or dynamic traffic paths, and wherein the static traffic paths are always weighted higher than the dynamic protection paths.
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| CN111092813B (en) * | 2019-12-18 | 2022-04-08 | 新华三半导体技术有限公司 | Equivalent multipath ECMP switching method, network equipment and system |
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| WO2007128176A1 (en) * | 2006-05-10 | 2007-11-15 | Huawei Technologies Co., Ltd. | A service switching method and the network node thereof |
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