CN101686151A - Path protection method and system of service transport network - Google Patents

Abstract

The embodiment of the invention relates to the field of communication transmission, and particularly discloses a channel protection method and system for a service transmission network. The method includes: dynamically adjusting the bandwidth of each service channel in the protection group of at least two service channels with the same source-sink node, when the sink node detects that other service channels except the lowest-priority service channel have the first When a fault occurs, the sink node switches the channel for receiving the service from the first failed service channel to the lowest priority service channel. The system includes: a dynamic adjustment module, a sink node and a source node. The present invention dynamically adjusts the bandwidth of each service channel in the protection group by establishing a channel protection group with the same source and sink nodes, which solves the problem in the prior art that the transmission network with dynamic bandwidth adjustment cannot be effectively protected, and improves the transmission network. Performance reliability, while improving bandwidth resource utilization.

Description

Channel protection method and system for service transmission network

technical field

The invention relates to the field of communication transmission, in particular to a channel protection method and system for a service transmission network.

Background technique

The transmission network implements the transmission of branch user signals through a multiplexing mechanism. A transport network includes a series of physically interconnected network elements. The physical connection between network elements becomes a section or line, and the path of a specific tributary signal passing through the transport network from end to end becomes a path. In SDH (Synchronous Digital Hierarchy), a channel is represented by a virtual container (VC-N) and its associated channel overhead (POH). Once the channel is established, its size and position will not change. A segment between network elements is represented by a Synchronous Transport Module (STM-N) transport frame and its corresponding segment overhead (SOH).

A basic requirement of the transport network is service availability (availability), so it is necessary to provide a protection mechanism for the transport network, so that the service transmitted on the failed working channel can be restored through a backup channel. The protection mechanism has been widely used and standardized, and the protection mechanisms of several SDH networks described in the prior art are as follows.

Section protection refers to the protection of physical lines between two network elements, including 1+1MSP (multiplex section protection), 1:N MSP and MS-SPRING (multiplex section shared protection ring). When the working channel fails, all services on the working channel are switched to the protection channel for transmission.

Path protection refers to the protection of a path or a section of it. The prior art describes the SDH1+1 channel protection mechanism of SNCP (Subnet Connection Protection). The business on the working channel is permanently bridged to a protection channel at the source end, and the sink end selects services from the working or protection channel according to the status of the channel.

The current standard defines a 1:N or even M:N protection mechanism, using 1 and M protection channels to protect N working channels respectively. Although the flexibility and bandwidth utilization are improved compared with 1+1 protection, there are still some limitations: a fixed number of working and protection channels needs to be configured. It can only be protected by a special protection channel. When the resources of the protection channel are insufficient, some working channels may not be protected.

In order to solve the above problems, the prior art proposes an improved method for optical network linear protection, which is used to protect faulty optical network service channels, which includes the following steps: configuring fixed Priority, set the priority of the service carried by the service channel as the service priority, and set its service priority to be the same as the fixed priority; select the service channel whose service priority is lower than the fixed priority of the faulty service channel from the service channels participating in linear protection The service channel is used as the protection channel, and the service bridge of the faulty service channel is switched to the protection channel. This prior art provides a method for automatically finding a service channel with a lower priority to protect the faulty service channel when any service channel fails, and improves the flexibility of protection mode configuration and increases the security of optical network services.

However, during the research process, the inventor found that the existing technology is based on SDH, OTN and other fixed time slot transmission technologies, and all channels in the protection group have the same size and cannot be changed, and whether the bandwidth of the protection channel is sufficient is not considered during switching. For a transmission network with dynamic bandwidth adjustment, this transmission technology based on fixed time slots cannot be applied.

Contents of the invention

In view of this, the embodiment of the present invention provides a channel protection method and system for a service transmission network, which solves the problem in the prior art that the transmission network with dynamic bandwidth adjustment cannot be effectively protected, and improves the reliability of transmission network performance .

An embodiment of the present invention provides a channel protection method for a service transmission network, including:

Dynamically adjust each of the protection groups of at least two service channels P1, P2, P3...Pm-1, Pm, Pm+1...Pn-1, Pn with the same source and sink nodes The bandwidth of the service channel is based on the bandwidth of the service channel with the largest bandwidth in the protection group, and the bandwidth of the service channel Pn with the lowest priority is adjusted to be greater than or equal to the bandwidth of other priority service channels; service channels P1, P2, P3... ...Pm-1, Pm, Pm+1....Pn-1, Pn priority is: PP1>PP2>...>PPn-1>PPn;

When the sink node detects that the first failure occurs in other service channels except Pn, the sink node switches the channel receiving the service from the first failed service channel to the lowest priority service channel Pn, and sends the first bridging request and first bridging channel information;

The source node bridges the service on the first faulty service channel to the lowest priority service channel Pn according to the received first bridge request and the first bridge channel information, and sets the priority of the lowest priority service channel Pn to Adjust the priority of the service channel that is the first fault;

The sink node switches the service on the first failed service channel to the lowest priority service channel Pn.

An embodiment of the present invention also provides a channel protection system for a service transmission network, including:

A dynamic adjustment module, for dynamically adjusting at least two service channels P1, P2, P3...Pm-1, Pm, Pm+1...Pn-1, The bandwidth of each service channel in the protection group of Pn is based on the bandwidth of the service channel with the largest bandwidth in the protection group, and the bandwidth of the service channel Pn with the lowest priority is adjusted to be greater than or equal to the bandwidth of other priority service channels; service channels P1, The priority of P2, P3...Pm-1, Pm, Pm+1...Pn-1, Pn is: PP1>PP2>...>PPn-1>PPn;

The sink node is used to detect the first failure of other service channels except Pn, switch the channel receiving the service from the first failed service channel to the lowest priority service channel Pn, and send the first bridging request and First bridge channel information;

The source node is configured to, according to the received first bridging request and first bridging channel information, bridge the service on the first faulty service channel to the lowest priority service channel Pn, and connect the lowest priority service channel Pn The priority of the first fault is adjusted to the priority of the service channel;

The sink node is further configured to switch the service on the first failed service channel to the lowest priority service channel Pn.

It can be seen that, in the embodiment of the present invention, by establishing a channel protection group with the same source and sink nodes, and dynamically adjusting the bandwidth of each service channel in the protection group, when a service channel fails, the service channel on the faulty Service, switch to the channel with the lowest priority among other service channels in the protection group, which solves the problem that the transmission network with dynamic bandwidth adjustment cannot be effectively protected in the prior art, improves the reliability of the transmission network performance, and improves the bandwidth at the same time resource utilization.

Description of drawings

The drawings described here are used to provide further understanding of the present invention, constitute a part of the application, and do not limit the present invention. In the attached picture:

FIG. 1 shows a flowchart of a channel protection method for a service delivery network in Embodiment 1 of the present invention;

Fig. 2 shows the channel protection network architecture diagram of the service delivery network in Embodiment 1 of the present invention;

Fig. 3 shows a schematic diagram of a channel protection system of a service transmission network in Embodiment 2 of the present invention.

Detailed ways

In order to make it easier for those skilled in the art to understand and realize the present invention, the embodiments of the present invention are described in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

The flow chart of the channel protection method of the service transmission network in the first embodiment of the present invention is shown in FIG. 1 .

Step 101, dynamically adjust the protection of at least two service channels P1, P2, P3...Pm-1, Pm, Pm+1...Pn-1, Pn with the same source and sink nodes The bandwidth of each service channel in the group is based on the bandwidth of the service channel with the largest bandwidth in the protection group, and the bandwidth of the service channel Pn with the lowest priority is adjusted to be greater than or equal to the bandwidth of service channels with other priorities; service channels P1, P2, and P3 ......Pm-1, Pm, Pm+1...Pn-1, Pn have the following priority order: PP1>PP2>...>PPn-1>PPn.

Step 102, when the sink node detects that the first fault occurs in other service channels except Pn, the sink node switches the channel receiving the service from the service channel of the first failure to the lowest priority service channel Pn, and sends a report to the source node Send the first bridge request and the first bridge channel information.

Step 103, the source node bridges the service on the first faulty service channel to the lowest priority service channel Pn according to the received first bridge request and the first bridge channel information, and bridges the service channel Pn with the lowest priority The priority is adjusted to the priority of the first faulty service channel.

Step 104, the sink node switches the service on the first failed service channel to the lowest priority service channel Pn.

Embodiments of the present invention may further include,

Before the above dynamic adjustment step, it further includes establishing at least two service channels P1, P2, P3...Pm-1, Pm, Pm+1...Pn with the same source and sink nodes -1. Pn is the protection group. The priorities of service channels P1, P2, P3...Pm-1, Pm, Pm+1...Pn-1, Pn are: PP1>PP2>...>PPn- 1>PPn. The priority of each service channel can be determined by the service priority carried by each channel, or manually configured when creating a protection group.

Embodiments of the present invention may further include,

When the sink node detects that the above-mentioned first fault is recovered, the sink node stops sending the above-mentioned first bridge request and the first bridge channel information, and after the set time arrives, the sink node switches back to the channel that recovers from the first fault to collect services , the source node stops bridging the services on the first failed service channel, restores the services on the preempted lowest priority service channel Pn, and adjusts the priority of the lowest priority service channel to the lowest priority PPn before bridging . The delay of the above-mentioned set time may be realized by a timing device such as a timer.

Embodiments of the present invention may further include,

Dynamically adjust the bandwidth of the service channel Pn-1 of the second lowest priority of the service channel to be greater than or equal to the bandwidth of other service channels except the service channel Pn of the lowest priority;

When the sink node detects that the second failure occurs on the lowest priority service channel Pn, the sink node will switch the channel receiving the service from the lowest priority service channel Pn to the second lowest priority service channel Pn-1, and report to the source node sending a second bridging request and second bridging channel information;

The source node bridges the service on the service channel Pn with the lowest priority to the service channel Pn-1 with the second lowest priority according to the received second bridge request and the second bridge channel information, and bridges the service with the second lowest priority The priority PPn-1 of the channel is adjusted to the priority of the first faulty service channel. If the service channel Pn-1 with the second lowest priority also fails, the services carried on it will continue to be adjusted, and the adjustment method used is similar to the above adjustment steps, which will not be repeated here.

Embodiments of the present invention may further include,

Dynamically adjust the bandwidth W1, W2, ...Wn of service channels P1, P2, P3...Pm-1, Pm, Pm+1...Pn-1, Pn, with W1 As a reference, adjust W1, W2, ... Wn to: W1≤W2≤...≤Wn. When the protection group is created, if the bandwidth of each channel is inconsistent, or the bandwidth of the channel with low priority is not greater than or equal to the bandwidth of the channel with higher priority, adjust the bandwidth of all channels to the same through dynamic bandwidth adjustment, or the bandwidth of the channel with low priority The bandwidth of the channel is greater than or equal to the bandwidth of the channel with a higher priority, which facilitates the preemption protection between channels.

Embodiments of the present invention may further include,

After receiving the bandwidth adjustment request information of any channel Pm in the service channels P1, P2, P3...Pm-1, Pm, Pm+1...Pn-1, Pn, according to the bandwidth Adjust the request information, calculate the new bandwidth Wm, and judge whether the bandwidth Wm+1 and Wm-1 of Wm and the adjacent channels Pm+1 and Pm-1 of the requested channel Pm satisfy: Wm+1≥Wm≥Wm-1; If it is satisfied, assign the bandwidth Wm to Pm; if it does not satisfy Wm+1≥Wm≥Wm-1, then judge whether Wm is smaller than Wm-1, if it is smaller, then do not adjust the bandwidth of Pm; if Wm is greater than Wm+1, then Adjust the bandwidth of Wm+1 so that Wm+1≥Wm.

If after adjustment, the bandwidth of all channels does not satisfy W1≤W2≤...≤Wn, then adjust the Wm+2 bandwidth in order to make it not less than Wm+1, and then adjust Wm+3,... , Wn bandwidth, and finally allocate bandwidth to the corresponding channel according to the adjusted Wm+1...Wn.

It can be seen from the above description that when a high-priority channel failure is detected, the current lowest-priority channel in the protection group is selected as the protection channel according to the priority rules (because the bandwidth of each channel in the protection group is guaranteed to be no less than that of other high-priority channels in the protection group). Priority channel bandwidth, so the bandwidth can be guaranteed), and adjust the priority of the protection channel to the priority of the protected channel. The switching and recovery process after bridging is the same as above, and will not be repeated here.

Embodiment 1 of the present invention may also specifically be:

In step 201, service channels P1, P2 and P3 with the same source and sink nodes are established as a protection group, and the priorities of service channels P1, P2 and P3 are: PP1>PP2>PP3.

Step 202, dynamically adjust the bandwidths W1, W2, W3 of the service channels P1, P2, P3, with W1 as the reference, adjust W2, W3 to: W3≥W1, W3≥W2.

Step 203, when the sink node detects that the service channel P1 fails, the sink node switches the received service channel from P1 to P3 with the lowest priority, and sends the first bridge request and the first bridge channel information to the source node.

Step 204, the source node bridges the service on the P1 channel to P3 according to the received first bridging request and first bridging channel information, and adjusts the priority of P3 to PP1.

Step 205, the sink node bridges the service on the P1 channel to P3.

The embodiment of the present invention may further include that when the sink node detects that the channel P1 has recovered from the failure, the sink node stops sending the first bridge request and the first bridge channel information, and after the set time arrives, the sink node switches back to the channel P1 , to receive the service of the channel P1, the source node stops the service of the bridging channel P1, recovers the service of the preempted channel P3, and adjusts the priority of P3 to PP3.

The embodiment of the present invention may further include dynamically adjusting the bandwidths W1 and W2 of the service channels P1 and P2, and adjusting W2 based on W1: W2≥W1; when the sink node detects that the channel P3 fails, the sink node will receive the The channel is switched from P3 to P2 with the lowest priority, and sends the second bridge request and the second bridge channel information to the source node; the source node transfers the service on the P3 channel according to the received second bridge request and the second bridge channel information Bridge to P2 and adjust the priority of P2 to PP1.

The embodiment of the present invention may further include dynamically adjusting the bandwidths W1, W2, and W3 of the service channels P1, P2, and P3. Taking W1 as a reference, adjusting W1, W2, and W3 is: W3≥W2≥W1.

The channel protection network architecture diagram of the service delivery network in Embodiment 1 of the present invention is shown in FIG. 2 .

Modules N1 and N2 represent the source node and sink node respectively. Modules A, B, C, D, E, and F represent the six network elements passed by the source node N1 and sink node N2 respectively. Network elements A and D form the service channel P1, network elements B and E form the service channel P2, and network elements C and F form the service channel P3. The bidirectional arrows indicate that the above three channels can be bidirectional channels, that is, services are transmitted from two directions at the same time.

The service channels P1, P2, and P3 with the same source and sink nodes are established as a protection group, and the priorities of the service channels P1, P2, and P3 are: PP1>PP2>PP3. When the sink node N2 detects the failure of the high-priority channel P1, according to the priority rules, select the current lowest-priority normal state channel P3 in the protection group as the protection channel, and switch the channel receiving the service to P3 to collect the original channel P1 business, and adjust the priority of the protection channel P3 to the priority of the protected channel P1. At the same time, it sends bridge request information, such as RDI or K bytes, and bridge channel information to the source node N1. In the solution of the embodiment of the present invention, when selecting the channel with the lowest priority, if there are multiple channels with the lowest priority in the protection group, then according to the number of each channel in the protection group, select among the channels with the same priority The one with the highest number is the protection channel.

When the source node N1 receives the bridging request information from the sink node N2, it bridges the service of the protected channel P1 to the corresponding low-priority protection channel P3 according to the received bridge channel information, and adjusts the priority of the protection channel P3 It is the priority of the protected channel P1. So far, channel P3 has completed the protection of channel P1, and services in P1 have been restored.

After the fault recovers, the sink node N2 cancels sending the bridging request, and enters WTR (Wait-to-Restore, waiting for recovery) to wait. After the source node N1 detects that the bridging request is canceled, it also enters WTR and waits. After the WTR ends, the sink node N2 switches back to the channel P3 to receive the protected service. The source node N1 cancels the bridging protected service and restores the preempted low priority service. At the same time, the priority of the protection channel is restored to the priority of the preempted low-priority service.

The channel protection system of the service transmission network in the second embodiment of the present invention is a dynamic adjustment module, which is used to dynamically adjust at least two service channels P1, P2, P3...Pm- 1. The bandwidth of each service channel in the protection group of Pm, Pm+1.....Pn-1, Pn is based on the bandwidth of the service channel with the largest bandwidth in the protection group, and the lowest priority service channel Pn is adjusted The bandwidth is greater than or equal to the bandwidth of service channels with other priorities; the priority of service channels P1, P2, P3...Pm-1, Pm, Pm+1...Pn-1, Pn is: PP1 >PP2>...>PPn-1>PPn.

The sink node is used to detect the first failure of other service channels except Pn, switch the channel receiving the service from the first failed service channel to the lowest priority service channel Pn, and send the first bridging request and First bridge channel information.

The source node is configured to, according to the received first bridging request and first bridging channel information, bridge the service on the first faulty service channel to the lowest priority service channel Pn, and connect the lowest priority service channel Pn The priority is adjusted to the priority of the first faulty service channel.

The source node is also used to switch the service on the first failed service channel to the lowest priority service channel Pn.

The channel protection system of the service delivery network in Embodiment 2 of the present invention may also be specifically as shown in FIG. 3 .

A protection group establishment module, used to establish at least two service channels P1, P2, P3...Pm-1, Pm, Pm+1...Pn-1, Pn is the protection group, and the priorities of service channels P1, P2, P3...Pm-1, Pm, Pm+1...Pn-1, Pn are: PP1>PP2>.... ..>PPn-1>PPn.

The dynamic adjustment module is used to dynamically adjust at least two or more service channels P1, P2, P3...Pm-1, Pm, Pm+1...Pn-1, Pn in the protection group Bandwidth, based on the bandwidth of the service channel with the largest bandwidth in the protection group, adjust the bandwidth of the service channel Pn with the lowest priority to be greater than or equal to the bandwidth of service channels with other priorities.

The above-mentioned dynamic adjustment module is a DBA (Dynamic Bandwidth Assignment, dynamic bandwidth allocation) module facing the whole network. The bandwidth request information is judged and calculated according to the existing bandwidth resources on each node channel, each node's service type, priority and other information, and finally the bandwidth allocation information of each node is sent to each node. Each node transmits data according to the allocated bandwidth. In the embodiment of the present invention, the bandwidth allocation information sent to each node is mainly a bandwidth map (BWmap). According to the bandwidth map, each node assembles the size and quantity of a T-CONT frame (Transmission Container, transmission container) to form at least two The service channels P1, P2, P3...Pm-1, Pm, Pm+1...Pn-1, Pn are used to transmit services.

The sink node is used to detect that when the first failure occurs on other service channels except Pn, the sink node switches the channel receiving the service from the first faulty service channel to the lowest priority service channel Pn, and sends the first bridging Request and first bridge channel information.

The source node is configured to, according to the received first bridging request and first bridging channel information, bridge the service on the first faulty service channel to the lowest priority service channel Pn, and connect the lowest priority service channel Pn The priority is adjusted to the priority of the first faulty service channel.

The sink node is further configured to switch the service on the first failed service channel to the lowest priority service channel Pn.

Embodiments of the present invention may further include,

The sink node includes a failure detection module, which is used to detect whether the first failure occurs in other service channels except Pn; a switching module, which switches the channel receiving the service from the first failed service channel to the lowest priority service channel Pn ; An information sending module, configured to send the first bridge request and the first bridge channel information.

The source node includes a bridge module, configured to bridge the service on the first faulty service channel to the lowest priority service channel Pn according to the received first bridge request and first bridge channel information; the priority adjustment module, It is used to adjust the priority of the lowest priority service channel Pn to the priority of the first faulty service channel.

The embodiment of the present invention may further include that the dynamic adjustment module is also used to dynamically adjust the bandwidth of the second lowest priority service channel Pn-1 of the service channel to be greater than or equal to the bandwidth of other service channels except the lowest priority service channel Pn The bandwidth of the service channel; the fault detection module is also used to detect the second failure of the service channel Pn with the lowest priority; the switching module is also used to switch the channel receiving the service from the service channel Pn with the lowest priority to the secondary The service channel Pn-1 with the lowest priority; the information sending module is also used for sending the second bridge request and the second bridge channel information; the bridge module is also used for receiving the second bridge request and the second bridge channel information , bridging the business on the service channel Pn with the lowest priority to the service channel Pn-1 with the second lowest priority; the priority adjustment module is also used to adjust the priority PPn-1 of the service channel with the lowest priority to Priority of the first faulty service channel.

The embodiment of the present invention may further include a dynamic adjustment module, which is also used to dynamically adjust service channels P1, P2, P3...Pm-1, Pm, Pm+1...Pn-1, The bandwidths W1, W2, ... Wn of Pn are based on W1, and W1, W2, ... Wn are adjusted to: W1≤W2≤...≤Wn.

It can be seen from the above description of the embodiments of the present invention that by establishing a channel protection group with the same source and sink nodes, and dynamically adjusting the bandwidth of each service channel in the protection group, when a service channel fails, the service on the failed service channel will , switching to the channel with the lowest priority among other service channels in the protection group, which solves the problem that the transmission network with dynamic bandwidth adjustment cannot be effectively protected in the prior art, improves the reliability of the transmission network performance, and improves the bandwidth resources at the same time utilization rate.

The specific signal processing and execution process among the modules of the above-mentioned system are based on the same idea as the method embodiment of the present invention, so refer to the description in Embodiment 1 of the present invention, and will not be repeated here.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be realized by means of software plus a necessary hardware platform, and of course all can be implemented by hardware, but in many cases the former is better implementation. Based on this understanding, all or part of the contribution made by the technical solution of the present invention to the background technology can be embodied in the form of software products, and the computer software products can be stored in storage media, such as ROM/RAM, magnetic disks, optical disks, etc. , including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute some methods of various embodiments or some parts of the embodiments of the present invention.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (13)

1, a kind of channel protection method of service transport network is characterized in that, comprising:

Dynamically adjust the bandwidth of each service channel in the protection group of plural at least service channel P1 with identical sources destination node, P2, P3......Pm-1, Pm, Pm+1.....Pn-1, Pn, bandwidth with the service channel of bandwidth maximum in the described protection group is a benchmark, and the bandwidth of the service channel Pn of adjustment lowest priority is more than or equal to the bandwidth of the service channel of other priority; The priority of described service channel P1, P2, P3......Pm-1, Pm, Pm+1.....Pn-1, Pn is: PP1＞PP2＞...＞PPn-1＞PPn;

When destination node detects other service channel except that Pn first fault takes place, destination node will receive professional passage and switch service channel Pn into lowest priority by the service channel of described first fault, and send the first bridge joint request and the first bridged appearances information to source node;

Source node is according to the described first bridge joint request and the described first bridged appearances information that receive, business on the service channel of described first fault is bridged on the service channel Pn of described lowest priority, and the priority of the service channel Pn of described lowest priority is adjusted into the priority of the service channel of described first fault;

Described destination node with the switching services on the service channel of described first fault to the service channel Pn of described lowest priority.

2, method according to claim 1; it is characterized in that; before described dynamic adjustment step, comprise that further setting up plural at least service channel P1, P2, P3......Pm-1, Pm, Pm+1......Pn-1, Pn with identical sources destination node is the protection group.

3, method according to claim 1, it is characterized in that, after destination node detects described first fault recovery, destination node stops to send described first bridge joint request and the described first bridged appearances information, after the time of setting arrives, destination node is switched back the passage pickup services of described first fault recovery, source node stops the business on the service channel of described first fault of bridge joint, business on the service channel Pn of the described lowest priority that recovery is seized, and the priority of the service channel of described lowest priority is adjusted into described lowest priority PPn before the bridge joint.

4, method according to claim 1 is characterized in that, further comprise,

Dynamically the bandwidth of the service channel Pn-1 of the inferior lowest priority of the described service channel of adjustment is, more than or equal to the bandwidth of other service channel except that the service channel Pn of lowest priority;

When second fault takes place in the service channel Pn that detects described lowest priority when destination node, destination node will receive professional passage and switch service channel Pn-1 into described lowest priority by the service channel Pn of described lowest priority, and send the second bridge joint request and the second bridged appearances information to source node;

Source node is according to the described second bridge joint request and the described second bridged appearances information that receive, business on the service channel Pn of described lowest priority is bridged on the service channel Pn-1 of described lowest priority, and the priority P Pn-1 of the service channel of described lowest priority is adjusted into the priority of the service channel of described first fault.

5, method according to claim 1, it is characterized in that, the step of described dynamic adjustment is specially, bandwidth W1, the W2 of the described service channel P1 of dynamic adjustment, P2, P3......Pm-1, Pm, Pm+1......Pn-1, Pn ... Wn, with W1 is benchmark, adjustment W1, W2 ... Wn is: W1≤W2≤...≤Wn.

6, method according to claim 5, it is characterized in that, further comprise, after the bandwidth adjustment request information of any one passage Pm in receiving described service aisle P1, P2, P3......Pm-1, Pm, Pm+1......Pn-1, Pn, according to described bandwidth adjustment request information, calculate new bandwidth Wm, judge whether bandwidth Wm+1, the Wm-1 of adjacency channel Pm+1, the Pm-1 of Wm and request channel Pm satisfies: Wm+1 〉=Wm 〉=Wm-1; If satisfy, then distribute bandwidth Wm to Pm.

7, method according to claim 5 is characterized in that, if do not satisfy Wm+1 〉=Wm 〉=Wm-1, Wm does not then adjust the bandwidth of Pm less than Wm-1; If Wm greater than Wm+1, then adjusts Wm+1, make Wm+1 〉=Wm.

8, a kind of path protection system of service transport network is characterized in that,

Dynamic adjusting module, be used for dynamically adjusting the bandwidth of each service channel in the protection group of plural at least service channel P1 with identical sources destination node, P2, P3......Pm-1, Pm, Pm+1......Pn-1, Pn, bandwidth with the service channel of bandwidth maximum in the described protection group is a benchmark, and the bandwidth of the service channel Pn of adjustment lowest priority is more than or equal to the bandwidth of the service channel of other priority; The priority of described service channel P1, P2, P3......Pm-1, Pm, Pm+1......Pn-1, Pn is: PP1＞PP2＞...＞PPn-1＞PPn;

Destination node, when being used to detect other service channel except that Pn first fault taking place, switch service channel Pn with receiving professional passage by the service channel of described first fault, and send the first bridge joint request and the first bridged appearances information into lowest priority;

Source node, be used for according to the described first bridge joint request and the described first bridged appearances information that receive, business on the service channel of described first fault is bridged on the service channel Pn of described lowest priority, and the priority of the service channel Pn of described lowest priority is adjusted into the priority of the service channel of described first fault;

Described destination node also is used for the service channel Pn of the switching services on the service channel of described first fault to described lowest priority.

9, the path protection system of service transport network according to claim 8; it is characterized in that; also comprise; the formwork erection piece is set up in protection, and being used to set up plural at least service channel P1, P2, P3......Pm-1, Pm, Pm+1......Pn-1, Pn with identical sources destination node is the protection group.

10, the path protection system of service transport network according to claim 8 is characterized in that, described destination node comprises,

Fault detection module, whether other service channel that is used to detect except that Pn first fault takes place;

Switch module, switch service channel Pn by the service channel of described first fault into lowest priority with receiving professional passage;

Information sending module is used to send the first bridge joint request and the first bridged appearances information;

11, the path protection system of service transport network according to claim 8 is characterized in that, described source node comprises,

Bridge module is used for the business on the service channel of described first fault being bridged on the service channel Pn of described lowest priority according to the described first bridge joint request and the described first bridged appearances information that receive;

The priority adjusting module is used for the priority of the service channel Pn of described lowest priority is adjusted into the priority of the service channel of described first fault.

12, the path protection system of service transport network according to claim 10, it is characterized in that, described dynamic adjusting module, also be used for, dynamically the bandwidth of the service channel Pn-1 of the inferior lowest priority of the described service channel of adjustment is, more than or equal to the bandwidth of other service channel except that the service channel Pn of lowest priority;

Described fault detection module also is used for, and whether the service channel Pn that detects described lowest priority second fault takes place;

The described module of switching also is used for, and when described fault detection module detects described second fault, switches service channel Pn-1 into described lowest priority with receiving the service channel Pn of professional passage by described lowest priority;

Described information sending module also is used for, and sends the second bridge joint request and the second bridged appearances information;

Described bridge module also is used for the business on the service channel Pn of described lowest priority being bridged on the service channel Pn-1 of described lowest priority according to the described second bridge joint request and the described second bridged appearances information that receive;

Described priority adjusting module also is used for the priority P Pn-1 of the service channel of described lowest priority is adjusted into the priority of the service channel of described first fault.

13, the path protection system of service transport network according to claim 8; it is characterized in that; described dynamic adjusting module; specifically be used for; bandwidth W1, the W2 of the described service channel P1 of dynamic adjustment, P2, P3......Pm-1, Pm, Pm+1......Pn-1, Pn ... Wn; with W1 is benchmark, adjustment W1, W2 ... Wn is: W1≤W2≤...≤Wn.

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