WO2008043285A1 - A protective method and device for mixed network - Google Patents

Abstract

This invention discloses a protective method and system for mixed network, belonging to network management field. To resolve the problem in prior art that SDH automatic protection switching (APS) applies only to optical network but fails to protect the Ethernet when SDH and Ethernet are both used for a mixed network, and that APS of SDH requires equipment support thus making it hard to be performed, this invention proposes a method of sending warning signals from master equipment to transmission equipment, and VRRP protective group monitoring the status of master SDH interface. With this method, protection of both SDH network and Ethernet is achieved. This invention also provides a mixed network protective device and system for SDH network and Ethernet protection.

Description

 The present invention relates to the field of network management, and in particular, to a method, device and system for protecting a hybrid network. BACKGROUND OF THE INVENTION Synchronous Digital Hierarchy (SDH) Automatic Protection Switching (APS) is a redundant protection mechanism defined by ITU G.783 and G.841, including multiplex section sharing protection. Ring, multiplex section dedicated line protection ring, linear multiplex section protection and other types.

 The multiplex section protection detects the optical path and device operation at one end of the multiplex section. When an abnormality is found, it passes the K1/K2 byte in the Multiplex Section Over Header (MSOH) of the protection channel. A protection switching request is issued, and the opposite end gives a protection switching mechanism for the switching bridge response. The multiplex section protection switching mechanism is divided into two modes: 1:N and 1+1. 1: In N mode, N service channels share one protection channel, and N is 14 at most. In the normal case without protection switching request, the protection channel can usually be used to transmit some additional services with a redundancy of 1/N, N. The larger the redundancy, the smaller the redundancy; when multiple channels need to apply for protection at the same time, only one channel can be protected. The 1 + 1 mode is a 100% redundancy protection mode. The sender sends traffic to the working channel and the protection channel at the same time, and selects the best quality one for receiving at the receiving end. The 1 + 1 redundancy protection mode is divided into single-ended switching and double-ended switching according to the switching direction. When the fault occurs, the service in the direction in which the fault occurs will be switched to the protection channel, and the other direction remains the same. The double-ended switching will switch the services in both directions to the protection channel at the same time. For the single-ended switching in the 1+1 mode, it can be implemented naturally without the support of the APS protocol.

Virtual Router Redundancy Protocol (Virtual Router Redundancy Protocol, VRRP is a fault-tolerant protocol that guarantees that when the next-hop router of the host fails, it can be replaced by another router in time to maintain communication continuity and reliability. In order to make VRRP work, first create a virtual IP address and Medium Access Control (MAC) address, so that a virtual router is added to the network, and the host on this network communicates with the virtual router. Learn about any information about physical routers on this network. A virtual router consists of a master router (Master) and several backup routers (Backups). The master router implements the real forwarding function. When the primary router fails, the backup router becomes the new primary router, taking over its work.

 In the current state of the art, most of the redundancy protection of the SDH network adopts the APS technology, which requires the device to support the APS feature. When the SDH and the Ethernet are mixed, the APS of the SDH is only applicable to the optical network. The protection of Ethernet cannot be realized. How to realize the dual protection of SDH and Ethernet is a problem to be solved. Summary of the invention

 In view of this, the embodiment of the present invention provides a method for protecting a hybrid network, and the method includes the following steps:

 The primary optical path between the transmission device and the primary device fails. The transmission device performs protection switching, and the traffic in the SDH to Ethernet direction of the synchronous digital system network is switched to the standby device for transmission.

 The virtual router redundancy protocol VRRP protection group monitors that the status of the primary SDH interface is unavailable, the VRRP priority of the primary device is lowered, and the traffic from the Ethernet to the SDH direction is switched to the standby device. .

The embodiment of the present invention further provides another method for protecting a hybrid network, including the following steps: The VRRP protection group on the primary device is reduced to the standby state, and the primary device is configured to transmit The switching device sends a switching alarm signal, and the transmitting device receives the switching alarm signal to perform protection switching, and the traffic in the SDH to Ethernet direction is switched to the standby device for sending;

 The standby device is upgraded to a primary VRRP device, and the traffic from the Ethernet to the SDH direction is switched to the standby device for transmission.

 The embodiment of the invention further provides a protection device for a hybrid network, the device comprising a primary optical path detection module, a VRRP protection group monitoring module, a trigger protection switching module and a flow switching module;

 The main optical path detecting module is configured to detect whether an optical path between the transmission device and the main device is faulty, and send the detection result to the trigger protection switching module;

 The VRRP protection group monitoring module is configured to monitor a status of the primary SDH interface, and send the monitored result to the traffic switching module;

 The trigger protection switching module is configured to trigger a protection switching of the transmission device when the detection result sent by the primary optical path detection module is faulty, and send the notification information of the transmission device to the traffic switching module for protection switching;

 The traffic switching module is configured to: according to the monitoring result sent by the VRRP protection group monitoring module, and the notification information sent by the trigger protection switching module, switch the traffic between the SDH and the Ethernet to the backup device for sending. .

 The embodiment of the present invention further provides a hybrid network protection system, including a primary device, a backup device, and a transmission device, where the transmission device is connected to the primary device through the primary optical path, and the standby device is configured through the standby optical path. Connect, configure a VRRP protection group for monitoring the status of the primary SDH interface between the active device and the standby device;

The primary device is configured to determine whether a fault occurs in the primary optical path of the transmitting device to the primary device, and if yes, the primary device sends a switching alarm signal to the transmitting device; The protection switching is performed according to the received switching alarm signal, and the traffic in the SDH to Ethernet direction is switched to the standby device for sending; The VRRP protection group is configured to monitor the status of the primary SDH interface, and when the status of the interface is unavailable, the VRRP priority on the primary device is lowered, and the Ethernet is switched to the SDH direction. Send to the backup device.

 The embodiment of the present invention further provides a hybrid network protection system, which includes an active device, a backup device, and a transmission device, where the transmission device is connected to the primary device through the primary optical path, and through the standby optical path and the standby device. Connected, configured with a VRRP protection group for monitoring the status of the primary SDH interface between the primary device and the standby device;

 The transmission device is configured to determine whether the primary optical path of the primary device to the transmission device is faulty, and if yes, the transmission device performs protection switching, and switches the traffic in the SDH to the Ethernet direction to the standby device. ;

 The VRRP protection group is configured to monitor the status of the primary SDH interface, and when the status of the interface is unavailable, the VRRP priority on the primary device is lowered, and the Ethernet is switched to the SDH direction. Send to the backup device.

 The technical solution of the present invention does not require the primary and backup devices for protection to support the APS feature, and reduces the input cost of the device. The method for implementing SDH protection is much simpler than the prior art, and the introduction of the VRRP protection group is While implementing SDH protection, Ethernet protection is also realized, and the protection of the two is effectively combined. BRIEF DESCRIPTION OF THE DRAWINGS

 1 is a schematic diagram of an SDH and Ethernet hybrid networking with an active device and a backup device; FIG. 2 is a flowchart of Embodiment 1 of the present invention;

 Figure 3 is a flow chart of Embodiment 2 of the present invention;

 Figure 4 is a flow chart of Embodiment 3 of the present invention;

Fig. 5 is a structural diagram of a protection device for a hybrid network. Mode for carrying out the invention

 The invention will be further described with reference to the accompanying drawings and specific embodiments, but not to be construed as limiting.

 As shown in Figure 1, the client device (device 1 and device 2) accesses the active and standby devices for automatic protection switching between SDH and Ethernet. The transmission device A supports the automatic protection switching function. Configure the primary and backup redundant protection interfaces, and connect the primary and backup redundant protection interfaces to the active and standby devices respectively. Configure the function of sending and receiving alarms for the primary and backup devices. Between the primary device and the backup device. Configure a VRRP protection group to monitor the status of the primary SDH interface. In the normal state, the status of the main optical path is available (UP), the status of the standby optical path is unavailable (DOWN), and the flow is transmitted through the main optical path.

 Example 1

 Referring to Figure 1 and Figure 2, if the primary optical path between the primary device and the transmission device A fails, the service protection switching needs to be performed in order to prevent the service from being interrupted or the service is quickly restored after the interruption. The main optical path failure is: the main optical path of the transmission device A to the main device is faulty, and the main device does not receive the optical signal. The embodiment of the present invention configures the function of transmitting the switching alarm signal of the active device. Therefore, when the primary device does not receive the optical signal, the primary device sends a switching alarm signal to the transmitting device A to trigger the protection switching process. The specific steps for performing service protection switching are shown in Figure 2:

 Step 101: When the primary device does not receive the optical signal, it sends a switching alarm signal to the transmission device A, such as a Loss of Frame (LOF), a Loss of Signal (LOS), and a Multiple Alarm Indicator (Multix). Section-Alarm indication Signal (MS-AIS), the transmission device A receives the switching alarm signal, performs protection switching, and the traffic from the SDH to the Ethernet direction is switched to the standby device. The status of the SDH port of the active device is set to DOWN. , set the SDH port of the standby device to UP.

Step 102: The status of the primary SDH interface is monitored by the VRRP protection group as DOWN, so the VRRP priority on the primary device is reduced, and the traffic from the Ethernet to SDH direction is switched to the standby device. Example 2

 Referring to FIG. 1 and FIG. 3, if the primary optical path between the primary device and the transmission device A fails, in order to prevent the service from being interrupted or the service is quickly restored after the interruption, the service protection switching needs to be performed, and the primary optical path is mainly used. The main optical path of the device to the transmission device A is faulty. The specific steps for performing service protection switching are shown in Figure 3:

 Step 201: Since the primary optical path of the primary device to the transmission device A fails, the transmission device A does not receive the optical signal, and the transmission device A does not receive the optical signal, so the protection switching is performed, and the SDH is in the direction of the Ethernet. The traffic is switched to the standby device to send.

 Step 202: The VRRP protection group monitors the status of the primary SDH interface as DOWN, so the VRRP priority on the primary device is reduced, and the traffic from the Ethernet to the SDH is switched to the standby device.

 In this way, when the primary optical path fails, the dual-direction traffic between the SDH and the Ethernet is switched to the standby device for transmission, so that the service is not interrupted due to the failure of the optical path, and even if the interruption is resumed in a short time. Business, will not affect the user's use.

 Example 3

 Referring to Figure 1 and Figure 4, the primary optical path is normal. When the primary VRRP is in the standby state, the traffic between the SDH and the Ethernet is switched to the standby device. The specific steps are as shown in Figure 4:

Step 301: When the primary VRRP is reduced to the standby state, the primary device sends a switching alarm signal to the transmission device A, such as LOF, LOS, MS-AIS, MS-, because the function of the transmission switching alarm signal of the primary device is configured. On the EXC, the transmission device A receives the switching alarm signal and performs protection switching. The traffic from the SDH to the Ethernet direction is switched to the standby device for transmission. Step 302: The standby device is upgraded to the primary VRRP, and the traffic in the Ethernet to SDH direction is switched to the standby device for sending.

 In this way, when the primary VRRP is reduced to the standby state, the dual-direction traffic between the SDH and the Ethernet is switched to the standby device for transmission, so that the service is not interrupted. Referring to FIG. 5, the present invention further provides a hybrid networking protection device, which includes a primary optical path detection module, a VRRP protection group monitoring module, a trigger protection switching module, and a traffic switching module.

 The main optical path detecting module is configured to detect whether an optical path between the transmitting device and the main device is faulty, and send the detection result to the trigger protection switching module;

 The VRRP protection group monitoring module is configured to monitor the status of the primary SDH interface, and send the monitored result to the traffic switching module.

 The trigger protection switching module is configured to trigger protection switching of the transmission device according to the detection result sent by the primary optical path detection module, and send the notification information of the transmission device for protection switching to the traffic switching module;

 The traffic switching module is configured to switch the traffic between the SDH and the Ethernet to the backup device according to the monitoring result sent by the VRRP protection group monitoring module and the notification information sent by the protection switching module.

 When the protection device is located on the main device side, the main optical path detecting module may further include: an active device receiving detecting unit and a switching alarm signal sending unit;

 The primary device receiving detecting unit is configured to detect whether a primary optical path of the transmitting device to the primary device is faulty, and send the detection result to the switching alarm signal sending unit; the switching alarm signal sending unit is configured to be used according to the primary device Receiving the detection result sent by the detecting unit, and sending a switching alarm signal to the transmission device.

When the protection device is located in the transmission device, the primary optical path detection module may also only The transmission device includes a detection unit, and does not include a switching alarm signal transmission unit. The transmission device receiving detection unit is configured to detect whether a transmission optical path of the primary device to the transmission device is faulty, and send the detection result to the trigger protection switching module.

 The VRRP protection group monitoring module may further include a status monitoring unit and a switching alarm signal sending unit;

 The status monitoring unit is configured to monitor the status of the VRRP protection group. When the VRRP protection group is reduced to the standby status, the status monitoring unit notifies the switching alarm signal sending unit to send a switching alarm signal to the transmission device.

 In the prior art, when the primary optical path fails, the traffic is quickly switched to the standby optical path through the APS. This requires that the primary device and the backup device need to support the APS feature, and also need to establish between the primary device and the standby device. Protection Group Protocol (PGP) channel. When the primary optical path fails, the PGP channel is used to switch between the active device and the standby device, so that the service is sent through the standby device, which increases the input of the device and wastes limited bandwidth resources. At the same time, the implementation method of SDH APS is also complicated.

 However, the solution provided by the embodiment of the present invention not only solves the problem of redundancy protection when the SDH network and the Ethernet coexist, but also the device does not need the device to support the APS, and the implementation is simple, and the device investment can be saved.

 The embodiments described above are only one of the more preferred embodiments of the present invention, and the general changes and substitutions made by those skilled in the art within the scope of the present invention should be included in the scope of the present invention.

Claims

Claim  A method for protecting a hybrid network, the method comprising: the primary optical path between the transmission device and the primary device fails, the transmission device performs protection switching, and the synchronous digital system network SDH to Ethernet The traffic in the direction is switched to the standby device to send;  The virtual router redundancy protocol VRRP protection group monitors that the status of the primary SDH interface is unavailable, the VRRP priority of the primary device is lowered, and the traffic from the Ethernet to the SDH direction is switched to the standby device. .  The method for protecting a hybrid network according to claim 1, wherein the primary optical path between the transmission device and the primary device fails, and the protection switching of the transmission device includes:  The main optical path of the transmitting device to the main device is faulty, the main device does not receive an optical signal, and sends a switching alarm signal to the transmitting device, where the transmitting device receives the switching alarm signal. Perform protection switching.  The method for protecting a hybrid network according to claim 1, wherein the primary optical path between the transmission device and the primary device fails, and the protection switching of the transmission device includes:  The optical path of the primary device to the transmitting device fails. The transmitting device does not receive the optical signal, performs protection switching, and the traffic in the SDH to Ethernet direction is switched to the standby device for sending.  The method for protecting a hybrid network according to claim 2 or 3, wherein the performing the protection switching comprises: Set the state of the SDH port of the active device to unavailable DOWN, and set the SDH port of the standby device to available UP. A method for protecting a hybrid network, the method includes: the VRRP protection group on the primary device is reduced to a standby state, and the primary device sends a switching alarm signal to the transmission device, where the transmission device Receiving the switching alarm signal, performing protection switching, and switching the traffic from the SDH to the Ethernet direction to the standby device for sending;  The standby device is upgraded to a primary VRRP device, and the traffic from the Ethernet to the SDH direction is switched to the standby device for transmission.  A protection device for a hybrid network, wherein the device comprises a primary optical path detection module, a VRRP protection group monitoring module, a trigger protection switching module, and a flow switching module;  The main optical path detecting module is configured to detect whether an optical path between the transmission device and the main device is faulty, and send the detection result to the trigger protection switching module;  The VRRP protection group monitoring module is configured to monitor a status of the primary SDH interface, and send the monitored result to the traffic switching module;  The trigger protection switching module is configured to trigger a protection switching of the transmission device when the detection result sent by the primary optical path detection module is faulty, and send the notification information of the transmission device to the traffic switching module for protection switching;  The traffic switching module is configured to: according to the monitoring result sent by the VRRP protection group monitoring module, and the notification information sent by the trigger protection switching module, switch the traffic between the SDH and the Ethernet to the backup device for sending. .  The protection device for a hybrid network according to claim 6, wherein the primary optical path detecting module comprises an active device receiving detecting unit and a switching alarm signal transmitting unit; The primary device receiving detection unit is configured to detect whether a transmission optical path of the transmission device to the primary device is faulty, and send the detection result to the switching alarm signal sending unit; the switching alarm signal sending unit is configured to use the Main device receiving detection unit The detected result is sent, and a switching alarm signal is sent to the transmission device.  The protection device for a hybrid network according to claim 6, wherein the primary optical path detecting module comprises a transmission device receiving detecting unit, and the transmitting device receiving detecting unit is configured to detect the primary device to the transmitting device Whether the transmission optical path is faulty, and sends the detection result to the trigger protection switching module.  The protection device of the hybrid network according to claim 6, 7 or 8, wherein the VRRP protection group monitoring module further comprises a status monitoring unit and a switching alarm signal sending unit, wherein the status monitoring unit is configured to: The status of the VRRP protection group is monitored. When the VRRP protection group is reduced to the standby state, the switching alarm signal sending unit is notified to send a switching alarm signal to the transmission device.  10. A hybrid network protection system, comprising: a primary device, a backup device, and a transmission device, wherein the transmission device is connected to the primary device through the primary optical path, and is connected to the standby device through the standby optical path, and is characterized by The VRRP protection group for monitoring the status of the primary SDH interface is configured between the active device and the standby device.  The primary device is configured to determine whether a fault occurs in the primary optical path of the transmitting device to the primary device, and if yes, the primary device sends a switching alarm signal to the transmitting device; The protection switching is performed according to the received switching alarm signal, and the traffic in the SDH to Ethernet direction is switched to the standby device for sending;  The VRRP protection group is configured to monitor the status of the primary SDH interface, and when the status of the interface is unavailable, the VRRP priority on the primary device is lowered, and the Ethernet is switched to the SDH direction. Send to the backup device. 11. A hybrid network protection system, comprising: a primary device, a backup device, and a transmission device, wherein the transmission device is connected to the primary device through the primary optical path, and is connected to the standby device through the standby optical path, and the characteristics thereof. The VRRP protection group for monitoring the status of the primary SDH interface is configured between the active device and the standby device. The transmission device is configured to determine whether the primary optical path of the primary device to the transmission device is faulty, and if yes, the transmission device performs protection switching, and switches the traffic in the SDH to the Ethernet direction to the standby device. ;  The VRRP protection group is configured to monitor the status of the primary SDH interface, and when the status of the interface is unavailable, the VRRP priority on the primary device is lowered, and the Ethernet is switched to the SDH direction. Send to the backup device.