CN1306734C - Service link protecting method for intelligent optical network - Google Patents

Abstract

The invention discloses a service link protection method of an intelligent optical network, comprising: the intelligent optical network establishes a service transmission link according to the service transmission signaling currently set at the control layer, and connects the current service to be transmitted along the currently established service The transmission link is used for transmission; the method also includes: when the initial link for service transmission fails or fails, shielding the original service signaling, setting another new routing information at the physical transport layer, and establishing another new service transmission link and switch the current service along the new service transmission link to continue transmission. This method solves the problem that when the link of the transmission service fails or fails, it cannot be transmitted through other links, and it is for the security of the entire intelligent optical network. operation is guaranteed.

Description

A service link protection method for an intelligent optical network

technical field

The invention relates to the field of intelligent optical networks, in particular to a service link protection method of an intelligent optical network.

Background technique

With the development of the network, the application of the optical network is becoming more and more extensive. The optical network transmits the signal through the entire network in the form of light, and directly performs the transmission, regeneration, switching and routing of the signal in the optical domain. The signal does not pass through the Any photoelectric conversion can achieve the goal of transmitting any format at any time and any place. When transmitting services, if the link for transmitting services fails or fails, other links are used to transmit the services. This process is realized by the protection switching of the linear multiplexing section or the switching of the shared protection ring of the multiplexing section. .

If the service transmission is performed under the linear multiplex section, that is, the service transmission is carried out between two network elements, as shown in Figure 1a and Figure 1b, Figure 1a and Figure 1b respectively show the implementation of linear multiplex section protection and before switching The schematic diagram and the schematic diagram before implementing linear multiplex section protection and switching, assuming that the service is transmitted between network element A and network element B, the implementation steps are as follows:

1) Before the service switching, that is, when the service is transmitted through the normal link, the service is transmitted to the optical port Port5 of the network element B through the optical port Port1 of the network element A;

2) After service switching occurs, that is, when the link between the optical port Port1 of network element A and the optical port Port5 of network element B fails or fails, the service is switched to the optical port Port2 of network element A and network element B The transmission is performed on the link between the optical ports Port6.

If the service is transmitted under the shared protection ring at the multiplex end, that is, the service is transmitted between multiple network elements, as shown in Figure 2, which is a schematic diagram before and after switching of the shared protection ring of the multiplex section. The icon represents a network element node, the thick solid line represents the link connection between network elements, the thin solid line represents the transmission path of the service before the multiplex section shared protection ring is switched, and the dotted line represents the multiplex section shared protection ring after switching For the transmission path of a service, it is assumed that a certain service is transmitted through Ring 1 and Ring 2 of the MSP shared protection ring, where Ring 1 is composed of NE 101, 102, 107, and 108, and Ring 2 is composed of NEs 102, network element 103, network element 106 and network element 104, when the service is transmitted from network element 100 to network element 105, it needs to pass through network element 100, network element 101, network element 102, network element 106, network element 104 For the link established with NE 105, when NE 106 fails, the switching of the multiplex section sharing protection ring must be performed, and the services are switched to NE 100, NE 101, NE 102, NE 103, and NE 104 and the link established by the network element 105 for transmission.

With the growth of data services on the Internet transmission protocol (IP), an intelligent optical network has been established. The intelligent optical network is to process IP data services on the traditional optical network. However, because the protocol supporting the intelligent optical network is an optical The multi-wavelength switching protocol (GMPLS) of the network, the GMPLS protocol does not support the protection switching process of the linear multiplexing protection section and the switching process of the multiplexing section sharing protection ring. Therefore, when the link of the transmission service fails or fails, It cannot be transmitted through other links, causing the paralysis of the entire intelligent optical network.

Contents of the invention

In view of this, the present invention provides a service link protection method of an intelligent optical network, which solves the problem that services cannot be transmitted through other links when a link for transmitting services in an intelligent optical network fails or fails, It provides guarantee for the safe operation of the entire intelligent optical network.

According to the above purpose, a service link protection method of an intelligent optical network,

Including: the intelligent optical network establishes a service transmission link according to the service transmission signaling currently set at the control layer, and transmits the current service to be transmitted along the currently established service transmission link; the method also includes:

When the initial link for service transmission fails or fails, shield the original service signaling, set up another new service transmission link with new routing information at the physical transport layer, and switch the current service along the new service transmission link continue transmission

When performing linear multiplex section protection switching, the process of establishing another service transmission link at the physical transport layer is: according to the port identifier in another new routing information set at the physical transport layer, establish a linear multiplex section Protect the service transmission link after switching.

When performing multiplex section shared protection ring switching, the process of establishing another service transmission link at the physical transport layer is: according to the label switching path LSP in another new routing information set at the physical transport layer, establish a multiplex Use the segment sharing protection ring to switch over the service transmission link.

The method further includes: after the faulty or invalid service transmission route is recovered, open the original service transmission signaling, and re-establish the original service transmission link according to the service port identifier in the original service transmission signaling, so that the current service is carried out along the original link transmission.

The method further includes: after the faulty or invalid service transmission route is recovered, open the original service transmission signaling, and re-establish the original service transmission link according to the LSP in the original service transmission signaling, so that the current service is transmitted along the original link.

The method provided by the present invention changes the link of service transmission by changing the signaling service port identifier in the GMPLS protocol or shielding the signaling in the GMPLS protocol, and fundamentally solves the problem of failure or failure of the link of the transmission service in the intelligent optical network. In the event of a failure, the problem that services cannot be transmitted through other links avoids the paralysis of the entire intelligent optical network and provides a guarantee for the safe operation of the entire intelligent optical network.

Description of drawings

Fig. 1a is a schematic diagram before implementing linear multiplex section protection switching.

Fig. 1b is a schematic diagram after realizing linear multiplex section protection switching.

Fig. 2 is a schematic diagram before and after switching of an MSP shared protection ring.

Fig. 3 is a flow chart of a method for realizing service link protection in an intelligent optical network by utilizing a linear multiplex section for protection switching or multiplex section shared protection ring for switching according to the present invention.

Fig. 4 is a flow chart of another method for realizing service link protection in an intelligent optical network by using a linear multiplex section for protection switching or multiplex section shared protection ring for switching according to the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail by citing the following embodiments and referring to the accompanying drawings.

The business of the intelligent optical network mainly depends on the business link for transmission, therefore, the business link must be established before the business transmission. Since the service link of the intelligent optical network is determined according to the given transmission signaling and routing, it is necessary to define the service transmission signaling to establish a service link in the intelligent optical network. In the existing service transmission signaling, information such as service port identification or Label Switching Path (LSP) is generally set, and the wireless communication system indicates the current service transmission route through the service port identification or LSP set in the transmission signaling, and according to The route establishes a service transmission path.

In the intelligent optical network, when the link of the transmission service fails or fails, if the service is still transmitted along the original link according to the existing transmission signaling, the service will not be transmitted through other links, resulting in the paralysis of service transmission . Since the networking topology of the intelligent optical network is the same as that of the optical network, a linear multiplex section protection or multiplex section sharing protection ring can be constructed in the intelligent optical network to realize the protection of service links, namely: It is guaranteed that the current service can still be transmitted normally when the link of the current transmission service fails or fails. The main network form of an intelligent optical network is a mesh network (MESH). Generally, a linear multiplex section protection or multiplex section sharing protection ring is constructed in the MESH network to protect service links.

As shown in Fig. 3, Fig. 3 is a flow chart of a method for realizing service link protection in an intelligent optical network by using a linear multiplex section for protection switching or a multiplex section shared protection ring for switching according to the present invention. The road is the original link, and the implementation process is as follows:

Steps 300 and 301, when the original link fails or fails, the protection switching is performed by adopting the linear multiplex section protection mode or the multiplex section shared protection ring mode;

Steps 302 and 303, when the linear multiplex section is used for protection switching, reset the service port identification in the service transmission signaling as the target service port identification to be switched to, and establish a new link according to the newly set service port identification, And switch the current service to transmit along the newly established link; when using the multiplex section shared protection ring for protection switching, reset the LSP in the service transmission signaling as the target LSP to be switched to, and then establish a new link based on the newly set LSP A new link is established, and the current service is switched and transmitted along the newly established link.

Since the intelligent optical network is divided into the signaling transport layer of the control plane and the physical transport layer, the signaling transport layer of the control plane and the physical transport layer can be separated after the normal link is disconnected, so that the physical transport The routing information of the layer is not controlled by the signaling set in the signaling transport layer of the control plane, as shown in Figure 4, Figure 4 is the realization of the present invention using the linear multiplex section for protection switching or the multiplex section shared protection ring for switching A flowchart of another method for service link protection in an intelligent optical network. Assuming that the link for the initial service transmission is the original service transmission link, the implementation process is as follows:

Step 400, setting the routing information of the linear multiplex section protection mode or the multiplex section shared protection ring mode at the physical transport layer;

Step 401, when the original link fails or fails, adopt the linear multiplex section protection mode or the multiplex section shared protection ring mode to perform protection switching;

In steps 402 and 403, the original service transmission signaling is shielded, and the service is transmitted along the communication link according to the preset routing information of the physical transport layer.

When the original service transmission link is restored, the current service transmission path can be switched back to the original service transmission path so that the service is still transmitted along the original service link. For the two schemes shown in Figure 3 and Figure 4, there are also two implementation methods for the recovery process of the transmission link:

The first implementation method is: for the method described in Fig. 3, under the linear multiplex section protection mode, the service port identification in the service transmission signaling is set as the original service port identification, and the original link is re-established according to the port identification, The current service is transmitted along the original link; in the multiplex section shared protection ring mode, the service transmission signaling resets the LSP to the original LSP, and re-establishes the original link according to the LSP, so that the current service is transmitted along the original link.

The second implementation method is: for the method described in Figure 4, the transport layer of the control plane is combined with the physical control layer, so that the transmission signaling controls the routing information of the physical control layer, the original service transmission signaling is opened, and the online complex In the section protection mode, the original service transmission link is re-established according to the service port identifier in the original service transmission signaling, so that the current service is transmitted along the original link; in the multiplex section shared protection ring mode, according to the original service transmission signal The LSP in the command re-establishes the original service transmission link, so that the current service is transmitted along the original link.

The following examples are used to illustrate the method. Taking the structure described in Fig. 1a and Fig. 1b as an example, when the link for transmitting services in the intelligent optical network fails or fails, a linear multiplex section protection service chain is constructed in the intelligent optical network road.

Example one:

When the service is initially transmitted, the port identifier in the service transmission signaling is set to the optical port Port1 of network element A and the optical port Port5 of network element B. The link between the optical port Port5 of B is used for transmission. When the link between the optical port Port1 of network element A and the optical port Port5 of network element B fails or fails, the port identifier in the service transmission signaling is changed. The optical port Port2 of NE A and the optical port Port6 of NE B, so that the service transmission signaling after changing the port ID supports the service along the link between the optical port Port2 of NE A and the optical port Port6 of NE B to transfer.

Example two:

Set the port identification in a service transmission signaling as the optical port Port1 of network element A and the optical port Port5 of network element B, and the service transmission signaling is the original service transmission signaling; pre-set the port identification of the routing information in the physical transport layer These are the optical port Port2 of NE A and the optical port Port6 of NE B.

When the service is initially transmitted, the original service transmission signaling service is transmitted through the link between the optical port Port1 of NE A and the optical port Port5 of NE B; when the optical port Port1 of NE A and the optical port When the link between the optical port Port5 fails or fails, the original service transmission signaling is shielded, the routing information of the physical transport layer is executed, and the service passes through the link between the optical port Port2 of network element A and the optical port Port6 of network element B. road for transmission.

Taking the structure described in Figure 2 as an example, when the link for transmitting services in the intelligent optical network fails or fails, a multiplex section shared protection ring is built in the intelligent optical network to protect the service link.

Example three:

When the service is initially transmitted, the LSP of the service transmission signaling is set to the link established by the network element 100, the network element 101, the network element 102, the network element 106, the network element 104 and the network element 105, and the service transmission signaling supports the service Transmission is carried out along the links established by network element 100, network element 101, network element 102, network element 106, network element 104, and network element 105. When network element 106 fails, the switching of the multiplex section shared protection ring must be performed. Change the LSP in the service transmission signaling to the link built by NE 100, NE 101, NE 102, NE 103, NE 104, and NE 105. According to the LSP, the current service is switched to NE 100 , NE 101 , NE 102 , NE 103 , NE 104 , and NE 105 for transmission.

Example four:

Set the LSP in a service transmission signaling as the link established by NE 100, NE 101, NE 102, NE 106, NE 104, and NE 105, and the service transmission signaling is the original service transmission signaling ; First set the LSP of the routing information in the physical transport layer as the link established by the network element 100, the network element 101, the network element 102, the network element 103, the network element 104 and the network element 105.

When the service is initially transmitted, the service is transmitted along the links established by the network element 100, the network element 101, the network element 102, the network element 106, the network element 104 and the network element 105 according to the original service transmission signaling, when the network element 106 After failure, the original service transmission signaling is shielded, and the routing information of the physical transport layer is executed, so that the service is carried out along the links established by network element 100, network element 101, network element 102, network element 103, network element 104 and network element 105. transmission.

According to the above method, the present invention solves the problem that in the intelligent network, when the link of the transmission service fails or fails, it cannot be transmitted through other links, and provides a guarantee for the safe operation of the intelligent network. had a good effect.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention. within the scope of protection.

Claims (5)

1. A service link protection method of an intelligent optical network, comprising: the intelligent optical network establishes a service transmission link according to the service transmission signaling currently set at the control layer, and transmits the current service to be transmitted along the currently established service transmission link for transmission; it is characterized in that the method also includes: When the initial link for service transmission fails or fails, shield the original service signaling, set another new routing information at the physical transport layer, establish another new service transmission link, and switch the current service along the new service transmission The link continues to transmit. 2. The method according to claim 1, wherein when performing linear multiplex section protection switching, the process of establishing another service transmission link at the physical transport layer is: The port identifier in another new routing information establishes a service transmission link after the linear multiplex section protection switching. 3. The method according to claim 1, wherein when the multiplex section shared protection ring is switched, the process of establishing another service transmission link at the physical transport layer is: Another label switching path LSP in the new routing information is used to establish a multiplex section sharing service transmission link after the protection ring switching. 4. The method according to claim 2, characterized in that the method further comprises: opening the original service transmission signaling after the faulty or invalid service transmission route is restored, and restarting according to the service port identifier in the original service transmission signaling Establish the original service transmission link, so that the current service is transmitted along the original link. 5. The method according to claim 3, further comprising: opening the original service transmission signaling after the faulty or invalid service transmission route is restored, and re-establishing the original service transmission route according to the LSP in the original service transmission signaling The service transmission link enables the current service to be transmitted along the original link.

Images