CN1949700A - Method and apparatus for mixed network protection - Google Patents

Abstract

The invention discloses a hybrid network protection method and device, belonging to the field of network management. In order to solve the problem that the SDH automatic protection switching method in the prior art is only applicable to the optical network, the protection of the Ethernet cannot be realized in the hybrid network of SDH and Ethernet, and the SDH automatic protection switching requires the equipment to support the APS feature, which is relatively difficult to implement. Complicated shortcomings, the present invention proposes a method in which the master device sends a switching alarm signal to the transmission device and the VRRP protection group monitors the state of the master SDH interface, and realizes SDH network protection and Ethernet protection through this method. The invention also provides a hybrid network protection device for realizing SDH network protection and Ethernet protection.

Description

A hybrid network protection method and device

technical field

The invention relates to the field of network management, in particular to a protection method and device for hybrid networking.

Background technique

Automatic Protection Switching (APS-Automatic Protection Switching) of SDH (Synchronous Digital Hierarchy-Synchronous Digital System) network is a redundant protection mechanism defined by ITU G.783 and G.841, including multiplex section shared protection ring, Multiplex section dedicated line protection ring, linear multiplex section protection and other types.

The multiplex section protection is to detect the optical fiber and equipment operation at each end of the multiplex section. The node sends out a protection switching request, and the opposite end gives a protection switching mechanism to switch the bridging response. The multiplex section protection switching mechanism is divided into two modes: 1:N and 1+1. In the 1:N mode, N service channels share one protection channel, and the maximum number of N is 14. Under normal conditions without a protection switching request, the protection channel It can usually be used to transmit some additional services, and its redundancy is 1/N, the larger N is, the smaller the redundancy is; when multiple channels need to apply for protection at the same time, only one channel can be protected. 1+1 is a 100% redundant protection method. The sending end sends services to the working channel and the protection channel, and the receiving end chooses the best quality route to receive. The 1+1 redundant protection mode is divided into single-ended switching and double-ended switching according to the switching direction. When a fault occurs in single-ended switching, only the services in the direction of the fault will be switched to the protection channel, and the other direction will remain the same as before. , and the double-ended switching will switch the services in the two directions to the protection channel at the same time. For the single-ended switching in the 1+1 mode, it can be realized naturally without the support of the APS protocol.

Virtual Router Redundancy Protocol (VRRP-Virtual Router Redundancy Protocol) is a fault-tolerant protocol, which ensures that when the next-hop router of the host fails, it can be replaced by another router in time, thereby maintaining the continuity of communication and reliability. In order to make VRRP work, a virtual IP address and MAC address must first be created, so that a virtual router is added to the network, and hosts on this network communicate with the virtual router without knowing any information about the physical router on the network. A virtual router is composed of a main router (Master) and several backup routers (Backup). The main router realizes the real forwarding function. When the main router fails, the backup router becomes the new main router and takes over its work.

In the current existing technology, most of the redundancy protection of the SDH network adopts the APS technology, which requires that the equipment must support the APS feature. When the main working path fails, the traffic will be quickly switched to the backup path through the APS for transmission. It is required that in addition to supporting the APS feature, the master and backup devices also need to establish a PGP (Protection Group Protocol) channel between the master and backup devices. The business is sent through the standby equipment, which increases the equipment investment and wastes limited bandwidth resources. At the same time, the implementation method of SDH APS is relatively complicated. When SDH and Ethernet are combined into a network, since the APS of SDH is only applicable to the optical network and cannot realize the protection of Ethernet, how to realize the dual protection of SDH and Ethernet is a problem to be solved.

Contents of the invention

In order to solve the problem in the prior art, the automatic protection switching method of SDH is only applicable to the optical network, and the protection of Ethernet cannot be realized in the hybrid network of SDH and Ethernet, and the automatic protection switching of SDH needs the equipment to support the APS feature. Complicated shortcoming, the present invention proposes a kind of active equipment to transmit the method that switchover alarm signal and VRRP protection group monitor active SDH interface state, described method comprises the following steps:

When the transmission optical path between the transmission equipment and the active equipment fails, the transmission equipment performs protection switching, and the traffic from SDH to Ethernet is switched to the standby equipment for transmission;

The VRRP protection group monitors that the status of the active SDH interface is DOWN, the VRRP priority on the active device is lowered, and the traffic from the Ethernet to SDH is switched to the standby device for transmission.

Described method specifically comprises:

The transmission optical path from the transmission equipment to the active equipment fails, the active equipment does not receive the optical signal, and sends a switching alarm signal to the transmission equipment, and the transmission equipment receives the switching alarm signal, and performs protection switching, SDH Traffic in the direction of Ethernet is switched to the standby device for sending;

The VRRP protection group monitors that the status of the active SDH interface is DOWN, the VRRP priority on the active device is lowered, and the traffic from the Ethernet to SDH is switched to the standby device for transmission.

Described method specifically comprises:

The transmission optical path from the main equipment to the transmission equipment fails, and the transmission equipment does not receive the optical signal, so protection switching is performed, and the traffic from SDH to Ethernet is switched to the standby equipment for transmission;

The VRRP protection group monitors that the status of the active SDH interface is DOWN, the VRRP priority on the active device is lowered, and the traffic from the Ethernet to SDH is switched to the standby device for transmission.

The main sending optical path is normal, and when the main VRRP is reduced to a standby state, the present invention also proposes a method for realizing SDH network protection and Ethernet protection, said method comprising the following steps:

The VRRP protection group on the active device is reduced to the standby state, the active device sends a switching alarm signal to the transmission equipment, and the transmission equipment receives the switching alarm signal, performs protection switching, and the traffic in the direction from SDH to Ethernet is switched to Spare equipment sending;

The backup device becomes the active VRRP device, and the traffic from the Ethernet to SDH direction is switched to the backup device for transmission.

The present invention also provides a hybrid network protection device, which includes a main transmission optical path detection module, a VRRP protection group monitoring module, a trigger protection switching module, and a traffic switching module;

The active sending optical path detection module is used to detect whether the sending optical path between the transmission equipment and the active equipment fails, and sends the detection result to the trigger protection switching module;

The VRRP protection group monitoring module is used to monitor the status of the active SDH interface, and send the monitored results to the traffic switching module;

The triggering protection switching module is used to trigger the protection switching of the transmission equipment according to the detection result sent by the active transmission optical path detection module, and send the notification information of the transmission equipment to perform protection switching to the traffic switching module;

The traffic switching module is used to switch the bidirectional traffic between SDH and Ethernet to the standby device for sending according to the monitoring result sent by the VRRP protection group monitoring module and the notification information sent by the triggered protection switching module.

The main sending optical path detection module includes a main equipment light receiving detection unit and a switching alarm signal sending unit;

The light receiving detection unit of the master device is used to detect whether the transmission optical path from the transmission device to the master device is faulty, and send the detection result to the switching alarm signal sending unit;

The switching alarm signal sending unit is configured to send a switching alarm signal to the transmission device according to the detection result sent by the light receiving detection unit of the master device.

The main transmission optical path detection module includes a transmission equipment light receiving detection unit, and the transmission equipment light reception detection unit is used to detect whether there is a failure in the transmission optical path from the main equipment to the transmission equipment, and send the detection result to the trigger protection Switch modules.

The VRRP protection group monitoring module includes a state monitoring unit, the state monitoring unit is used to monitor the state of the VRRP protection group, and when the VRRP protection group is reduced to a standby state, the switching alarm signal sending unit sends a switching signal to the transmission equipment warning signal.

Adopting the technical solution of the present invention does not require the main and backup equipment for protection to support the APS feature, which reduces the input cost of the equipment, and the method for realizing SDH protection is much simpler than the prior art, and because the introduction of the VRRP protection group makes While realizing the protection of SDH, it also realizes the protection of Ethernet, and the protection of the two is effectively combined.

Description of drawings

Figure 1 is a schematic diagram of SDH and Ethernet hybrid networking with primary and backup equipment;

Fig. 2 is the flowchart of embodiment 1 of the present invention;

Fig. 3 is the flowchart of embodiment 2 of the present invention;

Fig. 4 is the flowchart of embodiment 3 of the present invention;

Fig. 5 is a structural diagram of a protection device in a hybrid network.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

As shown in Figure 1, the client side (device A and device B) is connected to two main and backup devices to realize automatic protection switching of SDH and Ethernet. Transmission device A supports the function of automatic protection switching. Active and standby redundant protection interfaces, and connect the active and standby redundant protection interfaces to the active and standby equipment respectively, configure the function of sending switchover alarm signals on the active and standby equipment, and configure VRRP between the active and standby equipment to monitor the status of the active SDH interface protection group. In the normal state, the status of the active optical fiber is UP, the status of the backup optical fiber is DOWN, and the traffic is sent through the active optical fiber.

Example 1

Referring to Figure 1 and Figure 2, if the active transmission optical path between the active equipment and transmission equipment A fails, in order not to interrupt the service or quickly restore the service after the interruption, it is necessary to perform service protection switching, and the active transmission optical path appears The fault is the failure of the active transmission optical path from transmission equipment A to the active equipment. The specific steps for service protection switching are as follows:

Step 101: Since the main transmission optical path from transmission equipment A to the main equipment fails, the main equipment does not receive the optical signal. Since the present invention is configured with the function of transmitting and switching alarm signals of the main equipment, the main equipment will When no optical signal is received, a switching alarm signal, such as LOF, LOS, MS-AIS, and MS-EXC, is sent to transmission equipment A. The transmission equipment A receives the switching alarm signal and performs protection switching, and the traffic from SDH to Ethernet is switched to the standby equipment for transmission.

Step 102: Since the VRRP protection group monitors that the state of the active SDH interface is DOWN, the VRRP priority on the active device is lowered, and the traffic from the Ethernet to the SDH direction is switched to the standby device for transmission.

Example 2

Referring to Figure 1 and Figure 3, if the active transmission optical path between the active equipment and transmission equipment A fails, in order not to interrupt the service or quickly restore the service after the interruption, it is necessary to perform service protection switching, and the active transmission optical path appears The main transmission optical path from the active equipment to transmission equipment A is faulty, and the specific steps for service protection switching are as follows:

Step 201: Since the main transmission optical path from the master 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 direction from SDH to Ethernet The traffic is switched to the standby device for sending.

Step 202: Since the VRRP protection group monitors that the state of the active SDH interface is DOWN, the VRRP priority on the active device is lowered, and the traffic from the Ethernet to the SDH direction is switched to the standby device for transmission.

In this way, it is ensured that when the main transmission optical path fails, the bidirectional traffic between SDH and Ethernet is switched to the standby equipment for transmission, so that the service will not be interrupted due to the failure of the optical path, even if the interruption will be in a very short time To restore the business, the interruption time is only millisecond level, which will not affect the user's use.

Example 3

Referring to Figure 1 and Figure 4, the active transmission optical path is normal. When the active VRRP is reduced to the standby state, the traffic in both directions between SDH and Ethernet will be switched to the standby equipment for transmission. The specific steps for this are as follows:

Step 301: When the active VRRP is reduced to the standby state, since the present invention configures the function of sending the switching alarm signal of the active equipment, the active equipment sends a switching alarm signal to the transmission equipment A, such as LOF, LOS, MS-AIS, MS- EXC, transmission equipment A receives the switching alarm signal, performs protection switching, and switches the traffic from SDH to Ethernet to the standby equipment for transmission.

Step 302: The backup device becomes the active VRRP device, and the traffic in the direction from Ethernet to SDH is switched to the backup device for transmission.

In this way, it is guaranteed that when the active VRRP is in the standby state, the bidirectional flow between SDH and Ethernet is switched to the standby equipment for transmission, so that the service will not be interrupted.

Referring to Fig. 5, the present invention also provides a hybrid network protection device, the device includes a main transmission optical path detection module, a VRRP protection group monitoring module, a trigger protection switching module and a traffic switching module;

The active sending optical path detection module is used to detect whether the sending optical path between the transmission equipment and the active equipment fails, and sends the detection result to the trigger protection switching module;

The VRRP protection group monitoring module is used to monitor the status of the active SDH interface, and send the monitored results to the traffic switching module;

The triggering protection switching module is used to trigger the protection switching of the transmission equipment according to the detection result sent by the active transmission optical path detection module, and send the notification information of the transmission equipment to perform protection switching to the traffic switching module;

The traffic switching module is used to switch the bidirectional traffic between SDH and Ethernet to the standby device for sending according to the monitoring results sent by the VRRP protection group monitoring module and the notification information sent by the triggered protection switching module.

The main sending optical path detection module includes the main equipment light receiving detection unit and the switching alarm signal sending unit;

The light receiving detection unit of the main equipment is used to detect whether the transmission optical path from the transmission equipment to the main equipment fails, and sends the detection result to the switching alarm signal sending unit;

The switching alarm signal sending unit is used to send a switching alarm signal to the transmission equipment according to the detection result sent by the light receiving detection unit of the master equipment.

The active transmission optical path detection module also includes a transmission equipment light receiving detection unit, which is used to detect whether the transmission optical path from the active equipment to the transmission equipment is faulty, and sends the detection result to the trigger protection switching module.

The VRRP protection group monitoring module includes a state monitoring unit, which is used to monitor the state of the VRRP protection group. When the VRRP protection group is reduced to a standby state, the switching alarm signal sending unit sends a switching alarm signal to the transmission equipment.

The embodiments described above are only one of the more preferred specific implementation modes of the present invention, and the usual changes and substitutions performed by those skilled in the art within the scope of the technical solution of the present invention shall be included in the protection scope of the present invention.

Claims (8)

1. a mixed networking protecting method is characterized in that, said method comprising the steps of:

Transmission light path between transmission equipment and host apparatus breaks down, and described transmission equipment protection is switched, and SDH switches to stand-by equipment to the flow on the Ethernet direction and sends;

It is DOWN with the SDH Interface status that VRRP protection group monitors main, and the VRRP priority on the host apparatus reduces, and Ethernet switches to stand-by equipment to the flow on the SDH direction and sends.

2. mixed networking protecting method as claimed in claim 1 is characterized in that, described method specifically comprises:

Transmission equipment breaks down to the transmission light path of host apparatus, described host apparatus is not received light signal, switch alarm signal to described transmission equipment transmission, described transmission equipment is received the described alarm signal of switching, protect and switch, SDH switches to stand-by equipment to the flow on the Ethernet direction and sends;

It is DOWN with the SDH Interface status that VRRP protection group monitors main, and the VRRP priority on the host apparatus reduces, and Ethernet switches to stand-by equipment to the flow on the SDH direction and sends.

3. mixed networking protecting method as claimed in claim 1 is characterized in that, described method specifically comprises:

Host apparatus breaks down to the transmission light path of transmission equipment, and described transmission equipment is not received light signal, protects and switches, and SDH switches to stand-by equipment to the flow on the Ethernet direction and sends;

It is DOWN with the SDH Interface status that VRRP protection group monitors main, and the VRRP priority on the host apparatus reduces, and Ethernet switches to stand-by equipment to the flow on the SDH direction and sends.

4. a mixed networking protecting method is characterized in that, said method comprising the steps of:

VRRP protection group on the host apparatus is reduced to stand-by state, and host apparatus sends to transmission equipment and switches alarm signal, and described transmission equipment is received the described alarm signal of switching, and protects and switches, and SDH switches to stand-by equipment to the flow on the Ethernet direction and sends;

Stand-by equipment is upgraded to the main VRRP equipment of using, and Ethernet switches to stand-by equipment to the flow on the SDH direction and sends.

5. the protective device of a mixed networking is characterized in that, described device comprises that the master switches module and flow handover module with transmission light path detection module, VRRP protection group monitor module, trigger protection;

Whether the described main transmission light path that is used between detected transmission equipment and host apparatus with transmission light path detection module breaks down, and testing result is sent to described trigger protection switches module;

Described VRRP protection group monitor module is used to monitor main state with the SDH interface, and the result that will monitor sends to described flow handover module;

Described trigger protection is switched module and is used for the testing result with the transmission of transmission light path detection module according to described master, triggers the protection of transmission equipment and switches, and protect the announcement information of switching to described flow handover module transmission transmission equipment;

Described flow handover module is used for the supervision result that sends according to described VRRP protection group monitor module, and described trigger protection switches the announcement information that module sends, and the flow on the twocouese between SDH and Ethernet is switched to stand-by equipment send.

6. the protective device of mixed networking as claimed in claim 5 is characterized in that, described master comprises host apparatus receipts optical detecting unit and switches the alarm signal transmitting element with sending the light path detection module;

Whether described host apparatus is received optical detecting unit and is used for detected transmission equipment and breaks down to the transmission light path of host apparatus, and testing result is sent to the described alarm signal transmitting element of switching;

The described alarm signal transmitting element of switching is used for receiving the testing result that optical detecting unit sends according to described host apparatus, sends to transmission equipment and switches alarm signal.

7. the protective device of mixed networking as claimed in claim 5; it is characterized in that; described master comprises transmission equipment receipts optical detecting unit with sending the light path detection module; whether described transmission equipment is received optical detecting unit and is used to detect host apparatus and breaks down to the transmission light path of transmission equipment, and testing result is sent to described trigger protection switches module.

8. the protective device of mixed networking as claimed in claim 6; it is characterized in that; described VRRP protection group monitor module comprises the Stateful Inspection unit; described Stateful Inspection unit is used to monitor the state of VRRP protection group; when described VRRP protection group was reduced to stand-by state, the described alarm signal transmitting element of switching was switched alarm signal to the transmission equipment transmission.

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