WO2013029248A1

WO2013029248A1 - Protection resource allocation method, device and system

Info

Publication number: WO2013029248A1
Application number: PCT/CN2011/079162
Authority: WO
Inventors: 资小兵
Original assignee: 华为技术有限公司
Priority date: 2011-08-31
Filing date: 2011-08-31
Publication date: 2013-03-07
Also published as: CN103098416A; CN103098416B

Abstract

Disclosed is a protection resource allocation method. A first node and a second node have a first link therebetween; both a protection path of a first service and a protection path of a second service pass through the first link. The method comprises: a first node saving preset protection resources of a first service on a first link and preset protection resources of a second service on the first link; the first node receiving a protection switching request of the first service and occupying the preset protection resources of the first service on the first link; and if the preset protection resources of the second service on the first link and the preset protection resources of the first service on the first link share a common part, the first node reallocating the preset resources of the second service on the first link, and saving the reallocated preset protection resources of the second service on the first link. The first node timely allocates the present resources of the protection path according to the real-time usage of the protection resources in the first link, thereby making full use of the protection resources on the first link.

Description

Method, device and system for protecting resource allocation

The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a system for protecting resource allocation. Background technique

The transport network provides a connection for transferring data from one node to another. The network may be faulty. For example, the fiber link is broken, the node is powered down, etc. After the network fails, the connection in the network will fail, causing the data transmission to be interrupted. In order to restore the connection as soon as possible after a network failure and reduce the interruption of data transmission, it is necessary to provide a protection/recovery mechanism for the connections in the network.

The common protection mechanism has 1+1 protection. 1+1 protection, configure working connections and protection connections, data is transmitted simultaneously on both connections. Under normal circumstances, the destination node selects a good signal connection between the two to receive data. After the working connection fails, the data is received from the protected connection. A 1+1 protected connection is dedicated, meaning that only one working connection can be protected. Therefore, the 1+1 protection has a fast recovery speed, but it takes up a lot of resources. In order to improve resource utilization, shared protection can be adopted. In the shared protection mode, different protection paths can share protection resources, thus improving network resource utilization.

In the existing shared protection technology, the protection resources of each protection path are fixed. Since the protection resources can be shared by multiple protection paths, even if the protection resources are occupied by a protection path, even if the protection resources are available, other protection paths sharing the protection resources lose their protection. Summary of the invention

The embodiments of the present invention provide a method, an apparatus, and a system for protecting resource allocation, which can fully utilize protection resources.

An embodiment of the present invention provides a protection resource allocation method between a first node and a second node. The first link, the protection path of the first service, and the protection path of the second service all pass through the first link, and includes:

The first node saves the preset protection resource of the first service on the first link, and the preset protection resource of the second service on the first link;

The first node receives the protection switching request of the first service, and occupies the preset protection resource of the first service on the first link;

If the preset protection resource of the second service on the first link and the preset protection resource of the first service on the first link have a shared part, the first node re-allocates the second service on the first link The protection resource is saved, and the preset protection resource of the redistributed second service on the first link is saved.

The embodiment of the present invention provides a protection resource allocation node, where the protection resource allocation node is a first node, and the first node and the second node include a first link, a protection path of the first service, and a second service. The protection path passes through the first link, and the first node includes:

a saving unit, configured to save a preset protection resource of the first service on the first link, and a preset protection resource of the second service on the first link;

The protection switching unit is configured to receive a protection switching request of the first service, and occupy a preset protection resource of the first service on the first link;

a protection resource allocation unit, configured to re-allocate the second service in the first chain if the preset protection resource of the second service on the first link and the preset protection resource of the first service on the first link have a shared part The preset protection resource on the road saves the preset protection resource of the redistributed second service on the first link.

An embodiment of the present invention provides a protection resource allocation system, including a first node and a second node, where the first node and the second node include a first link, a protection path of the first service, and a protection path of the second service. Both pass the first link, including:

The first node is configured to save the preset protection resource of the first service on the first link, and the preset protection resource of the second service on the first link receives the protection switching request of the first service, and occupies the first service. Pre-protected resources on the first link, if the second service is preset protection resources on the first link And sharing a pre-protected resource with the first service on the first link, re-allocating the preset protection resource of the second service on the first link, and saving the re-allocated second service on the first link Presetting the protection resource, and notifying the second node of the preset protection resource of the second service re-allocated by the first node on the first link;

The second node is configured to save the preset protection resource of the first service on the first link, the preset protection resource of the second service on the first link, and the second service that is re-allocated by the first node is first. The preset protection resource on the link saves the preset protection resource of the second service stored on the first link.

In the embodiment of the present invention, the first node saves the preset protection resource of the first service on the first link, the second service is preset protection resource on the first link, and the first node receives the protection of the first service. The switching request occupies the preset protection resource of the first service on the first link, if the preset protection resource of the second service on the first link and the preset protection resource of the first service on the first link exist The shared part, the first node re-allocates the preset protection resource of the second service on the first link, and saves the preset protection resource of the redistributed second service on the first link. The first node may re-allocate the preset protection resources of the protection path in time according to the real-time usage of the protection resources in the first link, and may fully use the protection resources on the first link to prevent The protection switching failure caused by the resource conflict fails to provide effective protection for the shared protection service. In addition, the preset protection resources of the protection path can be updated in time. When the switchover needs to be performed, the preset protection resources of the protection path can be quickly used as the shared protection. The service provides protection switching and saves protection switching time. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description For some embodiments of the present invention, other drawings may be obtained from those skilled in the art without departing from the drawings.

FIG. 1 is a schematic flowchart of a method for allocating a protection resource according to an embodiment of the present invention; 2 is a schematic diagram of a network in an embodiment of the present invention;

3 is a schematic structural diagram of a protection resource allocation node according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a protection resource allocation system according to an embodiment of the present invention. detailed description

Specific embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic flowchart of a method for allocating a protection resource according to an embodiment of the present invention. In this embodiment, a first link, a protection path of a first service, and a second service are included between a first node and a second node. The protection path passes through the first link.

5101. The first node saves the preset protection resource of the first service on the first link, and the second service presets the protection resource on the first link.

The preset protection resource of the first service on the first link may be the first node of the protection path of the first service and may be notified to the first node, and may be allocated and saved by the first node, or may be assigned by the network management and notified. A node, of course, can also be assigned and notified by other nodes.

The preset protection resource of the second service on the first link may be the first node of the protection path of the second service and may be notified to the first node, and may be allocated and saved by the first node, or may be assigned by the network management and notified. A node, of course, can also be assigned and notified by other nodes.

S102: The first node receives the protection switching request, and occupies the preset protection resource of the first service on the first link.

The first node receives the protection switching request of the first service from the second node; or the first node receives the protection switching request of the first service from another neighboring node on the protection path of the first service, or

The first node receives a protection switching request from the network management.

5103. If the preset protection resource of the second service on the first link and the preset protection resource of the first service on the first link have a shared part, re-allocating the preset of the second service on the first link The resource is protected, and the preset protection resource of the redistributed second service on the first link is saved. In the embodiment of the present invention, the method may further include:

The second node saves the preset protection resource of the first service on the first link, and the preset protection resource of the second service on the first link;

The first node re-allocates the preset protection resource of the second service on the first link, and after the preset protection resource of the second service re-allocated by the first node is saved, the first node further includes:

The first node notifies the second node of the preset protection resource of the second service re-allocated by the first node on the first link, so that the second node saves the second service re-allocated by the first node on the first link. Preset protection resources.

In the embodiment of the present invention, the method may further include:

The first node stores the protection resource pool of the first service on the first link, and the protection resource pool of the second service on the first link;

The first node re-allocates the preset protection resources of the second service on the first link, and specifically includes:

The first node re-allocates the preset protection resources of the second service on the first link according to the protection resource pool of the second service on the first link.

In the embodiment of the present invention, the method may further include:

Receiving, by the first node, a protection switching request of the first service, specifically:

The first node receives the protection switching request of the first service from the second node; or the first node receives the protection switching request of the first service from another neighboring node on the protection path of the first service.

In the embodiment of the present invention, the method may further include:

Before the first node receives the protection switching request of the first service, the method further includes:

The first node is configured as a master node, and the second node is configured as a slave node. The preset protection resource of the second service that is re-allocated on the first link includes: saving the second service that is re-allocated by the first node. Pre-protected resources on the first link.

In the embodiment of the present invention, the method may further include: Receiving, by the second node, the second node from the second node, the preset protection resource of the second service on the first link, if the node number of the first node is larger than the second node, The preset protection resource of the second service on the first link includes: storing preset protection resources of the second service re-allocated by the first node on the first link, if the node number of the first node is smaller than the second node And saving the preset protection resource of the second service on the first link, where the re-allocated second service is configured to: save the preset protection resource of the second service re-allocated by the second node on the first link; or

Receiving, by the second node, the second node from the second node, the preset protection resource of the second service on the first link, if the node number of the first node is smaller than the second node, saving the redistributed The preset protection resource of the second service on the first link includes: storing preset protection resources of the second service re-allocated by the first node on the first link, if the node number of the first node is larger than the second node And saving the preset protection resource of the second service on the first link, where the re-allocated second service is configured to: save the preset protection resource of the second service re-allocated by the second node on the first link.

In this embodiment of the present invention, the method may further include: the protection resource is a time slot protection resource or a bandwidth protection resource.

In the embodiment of the present invention, the method may further include:

The method of the first link being the second side link of the first node further includes:

The first node stores the first service preset protection resource on the first side of the first node, and the preset protection resource on the first link of the first service is the first service preset protection on the second side of the first node. The resource, the first node receives the protection switching request of the first service, and occupies the preset protection resource of the first service on the first link, and specifically includes:

The first service is configured to carry the first service on the first side of the first node, and the first service is configured to carry the first service on the second side of the first node, and the cross-connection is configured to occupy the first service. Pre-protected resources on the first link.

The first node is an end node of the first service, and the first service presets the protection resource as the path terminal resource of the first service on the first side of the first node. In the embodiment of the present invention, the first node saves the preset protection resource of the first service on the first link, the second service is preset protection resource on the first link, and the first node receives the protection of the first service. The switching request occupies the preset protection resource of the first service on the first link, if the preset protection resource of the second service on the first link and the preset protection resource of the first service on the first link exist The shared part, the first node re-allocates the preset protection resource of the second service on the first link, and saves the preset protection resource of the redistributed second service on the first link. The first node may re-allocate the preset protection resources of the protection path in time according to the real-time usage of the protection resources in the first link, and may fully use the protection resources on the first link to prevent The protection switching failure caused by the resource conflict fails to provide effective protection for the shared protection service. In addition, the preset protection resources of the protection path can be updated in time. When the switchover needs to be performed, the preset protection resources of the protection path can be quickly used as the shared protection. The service provides protection switching and saves protection switching time.

The embodiments of the present invention can be applied to a circuit network. In a circuit network, each node generally uses circuit crossover to connect circuits in different links. For example, an optical transport network (OTN) network uses optical channel data units. (Optical channel data unit, ODU) Circuit cross-connection, Synchronous Digital Hierarchy (virtual container (VC) circuit cross-connection in SDH network. The following takes the 0DU service in the OTN network as an example. SDH The VC service used in the network is similar.

In the 0TN network, 0DUs of various rate levels are defined, which are marked as ODUj, where j has different values and represents different rate levels. For example, the rate of ODU0 is about 1 Gbps, the rate of 0DU1 is about 2.5 Gbps, the rate of 0DU2 is about 10 Gbps, the rate of 0DU3 is about 40 Gbps, and the rate of 0DU4 is about 100 Gbps. A plurality of low rate levels of ODUj (hereinafter referred to as low order ODUs) can be transmitted in a high rate level ODUk (hereinafter referred to as high order ODU) (j<k). At this time, one ODUk is divided into a plurality of time slots, each of which is 1.25 Gbps, and a plurality of ODUjs are multiplexed to 0DUk by occupying one or more time slots of the ODUk. The following describes the resource pool sharing protection method of the low-order ODU. The minimum unit in the protection resource pool is one time slot. A part of the time slot is divided into a protection resource pool, which can be shared by the protection paths of different 0DU services. In the embodiment of the present invention, the protection resource is a time slot resource, where In other embodiments, the protection resource may be an ODU resource, a VC resource, a bandwidth resource, or other resources. 2 is a schematic diagram of a network in an embodiment of the present invention.

As shown in Figure 2, it includes seven nodes A, B, C, D, E, F, and G, and eight links of AB, BC, AD, CE, DE, DF, EG, and FG. The nodes implement the intersection of low-order ODUs. Connections, links include two types of links: 0DU2 link and 0DU3 link. The total link rate of the 0DU2 link is 10 Gbps, divided into 8 1.25 Gbps time slots, the time slot number is l#—8#; the total link rate of the ODU3 link is 40 Gbps, divided into 32 1.25 Gbps times. The slot number is 1#-32#.

The following uses the network in Figure 2 as an example to illustrate a method for protecting resource allocation. The actual network may be more complicated, but the principle of protecting resource allocation is the same.

For the purpose of the device, there are two services in this embodiment: service 1 and service 2, service 1 is from interface 1 to interface 5, service type is 0DU1, two time slots are required, and service 2 is from interface 16 to interface 19, service The type is ODU0, which takes up 1 slot. The working paths and protection paths of Business 1 and Business 2 can be planned.

The planning result may include: a node, a link, and a time slot resource in the link of the service path of the service 1; a node, a link, a protection resource pool in the link, and a service 1 in the protection path of the service 1 Pre-protected resources in the pool; nodes, links, and time-slot resources in the link of the service path of service 2; nodes, links, protection resource pools in the link, and service 1 of the protection path of service 2 Pre-protected resources in the protection resource pool. The time slot resources in the protection resource pool can be shared by the protection paths of multiple services.

The planning algorithm can be implemented by the constraint shortest path first (CSPF) algorithm. The CSPF algorithm can calculate the path that satisfies the set constraint, for example, calculate the working path and protection path of the AC, and satisfy the constraint condition that the signal type is 0DU1, the working path and the protection path are separated; the working path and the protection path of the FH are similarly calculated. And the constraint condition that the signal type is ODU0, the working path and the protection path are separated. Since the working path and the protection path of the two services are separated, their protection paths can share the time slot resources in the overlapping part. Therefore, the preset protection resources can be allocated to the protection path of the service 1 on the interface 8/interface 9 2#/3# Time slot, for industry The protection path allocation of the service 2 is preset to protect the resource 2# time slot. Assume that the planning result of this embodiment is as follows when interface 8/interface 9 has 4#/5#:

Service 1 working path: Interface 1 - Interface 2 _ (1 #slot, 2#slot) - Interface 3 _ Interface 4 _ (5#slot, 6#slot) - Interface 20 - Interface 5.

Protection path of service 1: Interface 1 - Interface 6 - (Preset protection resources: 2# time slot, 5# time slot; Protection resource pool: 2# time slot, 5# time slot) - Interface 7 - Interface 8 - ( Preset protection resources: 2#slot, 3#slot; protection resource pool: 2#slot, 3#slot, 4#slot, 5#slot) - interface 9 - interface 10 (preset protection resources : 4#slot, 5#slot) - Interface 11 - Interface 5.

Working path of service 2: Interface 16 - Interface 17 - (1# time slot) - Interface 18 - Interface 19. Protection path of service 2: Interface 16 - Interface 14 - (Preset protection resource: 2# time slot; Protection resource pool: 2# time slot) - Interface 12 - Interface 8 - (Preset protection resource: 2# time slot; Protection resource pool: 2#slot, 3#slot, 4#slot, 5#slot) - interface 9 - interface 1 3 - (preset protection resource: 4# time slot) - interface 15 - interface 19.

After the service 1 and service 2 are planned, you need to configure the working path of each service and the protection path according to the planning result, including:

On the node where the working path of service 1 passes, configure the cross-connection, occupy the time slot resources of each link indicated by the planning result, that is, the working path of service 1 obtained according to the plan, and configure the intersection of 0DU1 in the 4, B, and C nodes. Connect, occupy the 1# time slot and 2# time slot of the AB link, the 5# time slot and the 6# time slot of the BC link; configure the cross connection on the node where the working path of the service 2 passes, occupy the planning result indication The time slot resources of each link, that is, the working path of the service 2 obtained according to the plan, in? The H node configures the cross-connection of ODU0 to occupy the 1# time slot of the F-H link.

On the node where the protection path of the service 1 passes, the protection path information is pre-stored, but the cross-connection is not configured, that is, the time slot resource is not occupied, and the saved information may include the protection path number, the preset protection resource, and the protection resource pool. On the node where the protection path of the service 2 passes, the protection path information is pre-stored, but the cross-connection is not configured, that is, the time slot resource is not occupied, and the saved information may include the protection path. Information such as path number, preset protection resources, and protection resource pool.

For the protection path of service 1, the protection path information is saved at nodes A, D, E, and C. For the non-end node, save the protection path number, signal type, whether the end node, the preset protection resource of the line side 1 link, the protection resource pool of the line side 1 link link, and the preset of the line side 2 link link. Protection resource pool for protection resources and line side 2 link links. For the end node, the protection path number, the signal type, the end node, the path terminal resource, the preset protection resource of the line side 2 link link, and the protection resource pool of the line side 2 link link are saved.

For the protection path of the service 2, the protection path information is saved at the nodes F, D, E, and H. For the non-end node, save the protection path number, signal type, whether the end node, the preset protection resource of the line side 1 link, the protection resource pool of the line side 1 link link, and the preset of the line side 2 link link. Protection resource pool for protection resources and line side 2 link links. For the end node, the protection path number, the signal type, the end node, the path terminal resource, the preset protection resource of the line side 2 link link, and the protection resource pool of the line side 2 link link are saved. The information stored in the nodes A, C, D, E, F, and H is as shown in Table 1 to Table 6. The node D is taken as an example. The node D stores the protection path information of the service 1 and the service 2, and the service 1 The protection path number is 1, the signal type is 0DU1, and is not the end node of service 1. The line side 1/path terminal saves the resources of the line side 1 link, specifically the interface number is 7, and the preset protection resource is 2#. And 5#, the protection resource pool is 2# and 5#, and the line side 2 stores the resources of the line side 2 link, specifically, the interface number is 8, the preset protection resources are 2# and 3#, and the protection resource pool is 2#, 3#, 4# and 5#, of course, the protection of the protection resources on both sides can be set according to requirements. For example, resources on the line side 2 link can be saved on the line side 1/path terminal, and saved on the line side 2 The resources of the line side 1 link. For service 2, the protection path number is 2, the signal type is ODU0, not the end node of service 2, and the line side 1/path terminal saves the resources of the line side 1 link, specifically the interface number is 12, preset protection resources 2#, the protection resource pool is 2#, and the line side 2 stores the resources of the line side 2 link, specifically, the interface number is 8, the preset protection resource is 2#, and the protection resource pool is 2#, 3#, 4# and 5#.

For the end node, the node A is taken as an example. The protection path number is 1, the signal type is 0DU1, which is the end node of the service 1. The line side 1/path terminal stores the resources of the line side 1 link, specifically The interface number is 1, the preset protection resources are 1# and 2#, the protection resource pool is 1# and 2#, and the line side 2 stores the resources of the line side 2 link, specifically the interface number is 6, preset protection The resources are 2# and 5#, and the protection resource pools are 2# and 5#. The path terminal resource saved by the line side 1/path terminal is the resource of the service 1 terminal. Table 1: Node A Protection Configuration Information

Table 2: Node C Protection Configuration Information

Table 3: Node D Protection Configuration Information

Table 4: Node E Protection Configuration Information

2 ODUO No 9 2 2, 3, 4, 5 13 4 4 Table 5: Node F Protection Configuration Information

Table 6: Node H Protection Configuration Information

Under normal conditions, the data of Service 1 and Service 2 are transmitted using their respective working paths.

In this implementation, the working path of the service 2 is faulty. For example, if the link between the FHs is interrupted, the automatic protection switching protocol is used, and the protection path of the service 2 occupies the preset protection resources, establishes an ODU0 cross connection, and receives the protection path from the protection path. And send data, of course, it is also possible to switch the service from the working path to the protection path for other reasons, such as the needs of network planning. The detailed protection switching process can be as follows:

1. Endpoint F of service 2 detects that the working path of service 2 is faulty, and the data transmission of service 2 is interrupted.

2. Endpoint F of service 2 triggers the protection switching action. Check the table 5 saved by the local node, and send an APS message to the interface in the line side 2 link. The service number (2) is specified in the message, requesting activation (occupying preset protection resources) , establish a cross) protection path 2.

3. The node D receives the APS message from the interface 12, learns that the protection path 2 is to be activated, checks the table 3 saved by the local node, and learns the protection resource of the protection path 2. Since the node D is not the end node of the service 2, the line side is The preset protection resources in 1 and the preset protection resources in line side 2 are respectively configured to carry the ODU0 signal, and the two ODU0 signals are cross-connected, that is, the preset of the service 2 in the link DE is occupied. The resource is protected, and the APS message is forwarded to another interface (interface 8). The service number is specified in the message, and the protection path 2 is requested to be activated.

In this embodiment, the protection resource is the time slot resource of the link, that is, the resource number in the preset protection resource and the protection resource pool is the resource number of the time slot, and the cross connection is configured to configure the protection resources of the two line sides into The 0DU bears the service, obtains the 0DU protection resource, and cross connects the two 0DUs.

In other embodiments, if the protection resource is the 0DU resource of the link, that is, the resource number of the preset protection resource and the protection resource pool is 0DU, the cross connection is configured to cross-connect the protection resources of the two line sides. . In other embodiments, if the protection resource is a VC resource, configuring the cross-connection is a cross-connection configuring the VC protection resource.

4. The node D checks that the protection path 2 needs to occupy the 2# time slot in the interface 8, and the 2# time slot is also the preset protection resource of the protection path 1, therefore, the node D protects the path from the interface 8. The protection resource pool of 1 reselects two time slots (3#, 4#) as the preset protection resources of protection path 1, reconfigures table 3, and sends a time slot assignment message to interface 8, specifying the service number in the message (1) ), preset protection resources (3#, 4#);

5. The node E receives the APS message from the interface 9, learns that the protection path 2 is to be activated, checks the table 4 saved by the local node, and learns the protection resource of the protection path 2. Since the node E is not the end node of the service 2, the line side is The preset protection resources in the 1st and the preset protection resources in the line side 2 are respectively configured to carry the ODU0 signal, and the two ODU0 signals are cross-connected, that is, the preset protection resources of the service 2 in the link DE are occupied, An interface (interface 13) forwards the APS message, and the specified service number in the message requests to activate the protection path 2;

6. The node E receives the time slot assignment message of the protection path 1 from the interface 9, and uses the preset protection resource specified in the message as the protection path 1 in the preset protection resource of the interface 9 and is configured in the table 4.

7. The node H receives the APS message from the interface 15, and learns that the protection path 2 is to be activated, and the table 6 saved by the local node is checked, and the protection resource of the protection path 2 is known. Since the node E is the end node of the service 2, the line side is The preset protection resource is configured to carry the ODU0 signal and send the protection path to the interface.

The 0DUQ signal of 19 receives the 0DUQ signal from the protection path and transmits it to the interface 19; 8. The node H returns an APS message to the interface 15. The service number (2) is specified in the message, and the protection path 2 is requested to be activated.

9. The node E receives the APS message from the interface 1 3, and since the protection path 2 has been activated, the APS message is forwarded to the other interface (interface 9);

1 0. Node D receives the APS message from interface 8, and since the protection path 2 has been activated, the APS message is forwarded to the other interface (interface 1 2);

The node F receives the APS message from the interface 14, and looks up the table 5, configures the preset protection resource in the protection resource 2 to carry the ODU0 signal, and sends the ODU0 signal from the interface 16 to the protection path, and receives the 0DUQ from the protection path. The signal is transmitted to the interface 16, and at this point, the service 2 data transmission is resumed.

In the above steps 4 and 6, the node D re-allocates the preset protection resource of the service 1 on the link FH, and then notifies the node E, and saves the preset of the service 1 re-allocated service 1 in the link FH at the node D and the node E. Protecting resources, in other embodiments, it is also possible that node E redistributes the preset protection resources of service 1 on link FH, and then notifies node D that node A and node E keep node E reassigned service 1 on link FH. The preset protection resources may also be re-allocated by the node D and the node E. The preset protection resources of the service 1 in the link FH need to provide a method for the node D and the node to finally save the preset protection resources. Consistent.

The two end nodes F and H of the working path of the service 2 may detect the fault at the same time, and trigger the protection switching. At this time, the node D and the node E may simultaneously allocate the preset protection resources of the service 1 in the link FH, and The terminal sends a slot allocation message. The preset protection resources reassigned by node D and node E may be different. For example, node D allocates #3/#4 time slots, and node E allocates #4/#5 time slots, and the two ends are inconsistent. This embodiment provides two methods to ensure that the service 1 that is finally saved by the node D and the node E is consistent in the preset protection of the link F-H.

Manner 1: The nodes at both ends of the link are respectively configured as a master node and a slave node, and the master node is responsible for reallocating the preset protection resources and notifying the slave nodes. For example, for the link between node D and node E, node D is configured as a master node, and node E is configured as a slave node. When it is necessary to re-allocate preset protection resources for the link between DEs, node D is responsible for Assign, and use the time slot assignment message to inform the node £. Manner 2: The slot number assignment message carries the node number, and the configuration with the node number is valid. For example, if the node number of the node D is smaller than the node number of the node E, when the node D/node E simultaneously allocates a message to the opposite end, the node D receives the time slot assignment message sent by the node E, and then applies the message in the application message. Time slot allocation scheme.

In the embodiment of the present invention, the re-allocated preset protection resource between the node D and the node E is transmitted by using a time slot allocation message, and the time slot allocation message may be implemented by using the overhead of the 0DU link, and may also utilize the out-of-band control between the nodes. The channel is implemented. The 0DU link can carry 0DU frames, which define overhead and payload. The time slot allocation message is transmitted by using the 0DU overhead. For example, the time slot allocation message (the message content including the protection path number and the slot number of the preset protection resource) may be encapsulated by the HDLC and sent to the opposite end by using the GCC1 overhead of the 0DU. When the time slot assignment message is implemented by an outband control channel, such as an Ethernet link, the time slot assignment message may be encapsulated into an I P packet and sent to the peer end through an Ethernet link.

In the embodiment of the present invention, the preset protection resources of the protection path can be updated in time. When the switchover needs to be performed, the protection protection switch can be used to protect the shared protection service and save the protection switching time.

As shown in FIG. 3, a protection resource allocation node is provided in the embodiment of the present invention, where the protection resource allocation node is a first node, and the first node and the second node include a first link, and the first service Both the protection path and the protection path of the second service pass through the first link, and the first node includes:

The saving unit 301 is configured to save the preset protection resource of the first service on the first link, and the preset protection resource of the second service on the first link;

The protection switching unit 302 is configured to receive a protection switching request of the first service, and occupy a preset protection resource of the first service on the first link;

The protection resource allocation unit 303 is configured to re-allocate the second service in the first part if the preset protection resource of the second service on the first link and the preset protection resource of the first service on the first link have a shared part The preset protection resource on the link saves the preset protection resource of the redistributed second service on the first link. The second node saves the preset protection resource of the first service on the first link, and the second service is a preset protection resource on the first link, where the first node further includes:

a notification unit, configured to notify the second node of the preset protection resource of the second service re-allocated by the first node on the first link, so that the second node saves the second service redistributed by the first node on the first link Preset protection resources on.

The saving unit 301 is further configured to save the protection resource pool of the first service on the first link, and the protection resource pool of the second service on the first link;

The protection resource allocation unit 303 is specifically configured to reallocate the preset protection resource of the second service on the first link according to the protection resource pool of the second service on the first link.

In the embodiment of the present invention, the method further includes:

The protection switching unit 302 specifically includes: a protection switching request for receiving the first service from the second node; or

The protection switching unit 302 specifically includes: a protection switching request for receiving a first service from another neighboring node on the protection path of the first service.

In the embodiment of the present invention, the method further includes:

a configuration unit, configured to configure the first node as a master node;

The protection resource allocation unit 303 is specifically configured to save the preset protection resource of the second service re-allocated by the first node on the first link.

In the embodiment of the present invention, the method further includes:

The protection resource allocation unit 303 is specifically configured to receive, by the second node, the second node, to re-allocate the preset protection resource of the second service on the first link, and if the node number of the first node is larger than the second node, save the first Pre-protected resources of the second service re-allocated by the node on the first link. If the node number of the first node is smaller than the second node, the second service re-allocated by the second node is saved on the first link. Preset protection resources; or,

The protection resource allocation unit 303 is specifically configured to receive, by the second node from the second node, a preset protection resource that is re-allocated the second service on the first link, if the node number of the first node is smaller than the second node. If the point is small, the preset protection resource of the second service re-allocated by the first node on the first link is saved. If the node number of the first node is larger than the second node, the second service re-allocated by the second node is saved. Pre-protected resources on the first link.

In the embodiment of the present invention, the method further includes:

The first link is a second side link of the first node, and includes:

The saving unit is further configured to save the first service on the first side of the first node, and the preset protection resource on the first link is the first service, and the first service is preset on the second side of the first node. Protect resources;

The protection switching unit is configured to configure the first service to carry the first service on the first side of the first node, and to configure the first service to carry the first service on the second side of the first node. The connection occupies the preset protection resource of the first service on the first link.

In the embodiment of the present invention, the first node may re-allocate the preset protection resources of the protection path in time according to the real-time usage of the protection resources in the first link, and may fully use the first link. The protection resources on the network prevent the failure of protection switching caused by resource conflicts and provide effective protection for the shared protection service.

As shown in FIG. 4, a protection resource allocation system includes a first node 401 and a second node 402. The first node and the second node include a first link, a protection path of the first service, and a second service. The protection path passes through the first link, including:

The first node 401 is configured to save the preset protection resource of the first service on the first link, and the preset protection resource of the second service on the first link receives the protection switching request of the first service, occupying the first The preset protection resource of the service on the first link, if the preset protection resource of the second service on the first link and the preset protection resource of the first service on the first link have a shared part, redistribution The preset protection resource on the first link of the second service, the preset protection resource of the second service re-allocated on the first link, and the second service redistributed by the first node on the first link Notifying the second node by the preset protection resource;

The second node 402 is configured to save the preset protection resource of the first service on the first link, the second industry The preset protection resource on the first link receives the preset protection resource of the second service re-allocated by the first node on the first link, and saves and stores the redistributed second service on the first link. Preset protection resources.

Through the description of the above embodiments, those skilled in the art can clearly understand that the embodiments of the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions. A computer device (which may be a personal computer, server, or network device, etc.) is caused to perform the methods described in various embodiments of the present invention.

The above disclosure is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and thus equivalent changes made in the claims of the present invention are still within the scope of the present invention.

Claims

A protection resource allocation method, the first node and the second node include a first link, and the protection path of the first service and the protection path of the second service pass through the first link, and the method includes: The first node saves the preset protection resource of the first service on the first link, and the preset protection resource of the second service on the first link;

The first node receives the protection switching request of the first service, and occupies the pre-protected resource of the first service on the first link;

2. The method for allocating a protection resource according to claim 1, wherein the method further comprises:

The first node re-allocates the preset protection resource of the second service on the first link, and after the preset protection resource of the second service re-allocated by the first node on the first link, the method further includes:

The method for allocating a protection resource according to claim 1, wherein the method further comprises:

The first node re-allocating the preset protection resource of the second service on the first link, specifically: the first node re-allocating the second service according to the second service in the protection resource pool on the first link. Preset protection resources on the link.

The protection resource allocation method according to claim 1, wherein the first node receives the protection switching request of the first service, which specifically includes:

The first node receives a protection switching request of the first service from the second node; or The first node receives a protection switching request for the first service from another neighboring node on the protection path of the first service.

The method for allocating a protection resource according to claim 1, wherein before the receiving, by the first node, the protection switching request of the first service, the method further includes:

The method for allocating a protection resource according to claim 2, wherein the method further comprises:

Receiving, by the second node, the second node from the second node, the preset protection resource of the second service on the first link, if the node number of the first node is larger than the second node, The preset protection resource of the second service on the first link includes: storing preset protection resources of the second service re-allocated by the first node on the first link, if the node number of the first node is smaller than the second node And saving the preset protection resource of the second service on the first link, where the re-allocated second service is configured to: save the preset protection resource of the second service re-allocated by the second node on the first link; or

The protection resource allocation method according to claim 6, wherein the first node further includes before receiving, by the second node, the second node from the second node, the second service is pre-allocated on the first link. The second node receives the protection switching request of the first service, and occupies the preset protection resource of the first service on the first link.

The protection resource allocation method according to any one of claims 1 to 7, wherein the protection resource is a time slot protection resource or a bandwidth protection resource.

The method for allocating a protection resource according to claim 1, wherein the first link is a second side link of the first node, and the method further includes: The first node stores the first service preset protection resource on the first side of the first node, and the preset protection resource on the first link of the first service is the first service preset protection on the second side of the first node. The resource, the first node receives the protection switching request of the first service, and occupies the preset protection resource of the first service on the first link, and specifically includes:

The protection resource allocation method according to claim 9, wherein the first node is an end node of the first service, and the first service presets the protection resource as the first service on the first side of the first node. Path terminal resources.

A protection resource allocation node, where the protection resource allocation node is a first node, and the first node and the second node include a first link, and the protection path of the first service and the protection path of the second service are both The first link is characterized in that: the first node includes:

The node according to claim 11, wherein the second node saves the preset protection resource of the first service on the first link, and the preset protection resource of the second service on the first link, A node also includes:

The node according to claim 11, comprising:

The saving unit is further configured to save the protection resource pool of the first service on the first link, and the second service is in the first a pool of protection resources on a link;

The protection resource allocation unit is specifically configured to re-allocate the preset protection resources of the second service on the first link according to the protection resource pool of the second service on the first link.

The node according to claim 11, comprising:

The protection switching unit specifically includes: a protection switching request for receiving the first service from the second node; or

The protection switching unit specifically includes: a protection switching request for receiving a first service from another neighboring node on the protection path of the first service.

The node according to claim 11, further comprising:

a configuration unit, configured to configure the first node as a master node;

The protection resource allocation unit is specifically configured to save the preset protection resource of the second service re-allocated by the first node on the first link.

The node according to claim 11, comprising:

The protection resource allocation unit is specifically configured to receive, by the second node from the second node, a preset protection resource for reallocating the second service on the first link, and if the node number of the first node is larger than the second node, save the first Pre-protected resources of the second service re-allocated by the node on the first link. If the node number of the first node is smaller than the second node, the second service re-allocated by the second node is saved on the first link. Preset protection resources; or,

The protection resource allocation unit is specifically configured to receive, by the second node of the second node, a preset protection resource for reallocating the second service on the first link, and if the node number of the first node is smaller than the second node, save the first Pre-protected resources of the second service re-allocated by the node on the first link. If the node number of the first node is larger than the second node, the second service re-allocated by the second node is saved on the first link. Preset protection resources.

The node according to claim 11, wherein the first link is a second side link of the first node, and includes:

The protection switching unit is specifically configured to configure the first service to preset the protection resource on the first side of the first node. The first service is configured, and the first service is configured to carry the first service on the second side of the first node, and the cross-connection is configured to occupy the preset protection resource of the first service on the first link.

18. A protection resource allocation system, comprising: a first node and a second node, wherein the first node and the second node comprise a first link, and the protection path of the first service and the protection path of the second service pass the first A link, which is characterized by:

The first node is configured to save the preset protection resource of the first service on the first link, and the preset protection resource of the second service on the first link receives the protection switching request of the first service, and occupies the first service. The preset protection resource on the first link, if the preset protection resource of the second service on the first link and the preset protection resource of the first service on the first link have a shared part, reallocating the second The preset protection resource on the first link of the service, the preset protection resource of the second service re-allocated on the first link, and the second service re-allocated by the first node on the first link The second node is configured to save the preset protection resource of the first service on the first link, and the preset protection resource of the second service on the first link is received by the first node. The preset protection resource of the second service on the first link is saved, and the preset protection resource of the second service stored on the first link is saved.