CN115333614B

CN115333614B - System, method and POTN device for realizing ODUk protection by using equivalent protection class

Info

Publication number: CN115333614B
Application number: CN202210883507.0A
Authority: CN
Inventors: 黄力; 张小虎; 肖杉
Original assignee: Fiberhome Telecommunication Technologies Co Ltd
Current assignee: Fiberhome Telecommunication Technologies Co Ltd
Priority date: 2022-07-26
Filing date: 2022-07-26
Publication date: 2023-05-05
Anticipated expiration: 2042-07-26
Also published as: CN115333614A

Abstract

The invention discloses a system, a method and POTN equipment for realizing ODUk protection by using an equivalent protection class, wherein the system comprises an NP module, an OTN module and an APS module, a packet preprocessing unit is used for preprocessing a received message, and an FEC configuration unit is used for configuring a selective transmission matching table of a lower call direction and a selective reception filtering table of an upper call direction by using the equivalent protection class; the OTN module is used for acquiring the alarm information of the ODUk layer and sending the alarm information to the APS module, selecting an output port of the main ODUk or the standby ODUk to forward the message according to the generated selected switching command, and/or determining that the message passes through an input port of the main ODUk or the standby ODUk according to the generated selected switching command; the APS module is used for generating APS alarm information according to the alarm information of the ODUk layer, the main control state machine is used for generating a selected switching command according to the APS alarm information and sending the selected switching command to the OTN module, and/or generating a selected switching command according to the APS alarm information and sending the selected switching command to the OTN module.

Description

System, method and POTN device for realizing ODUk protection by using equivalent protection class

Technical Field

The invention relates to the technical field of POTN (plain old telephone number) transmission, in particular to a system, a method and POTN equipment for realizing ODUk protection by using an equivalent protection class.

Background

The POTN equipment integrates the PTN function and the OTN function, has wide market application, is a packet service access system, and is loaded into an OTN pipeline (shown in figure 1) through an OTN frame chip at the rear end after corresponding packet processing is completed, and is transmitted and forwarded through OTN signals.

In general, protection of OTN is implemented using 1+1protection, which is related to the characteristics of OTN service, and a fast and efficient switching is required and a service model satisfying unidirectional/bidirectional protection is required.

In the POTN equipment, the receiving and transmitting protection processing of the PTN service carried by the OTN is realized by a PTN module, namely the PTN module is required to complete the double-sending of the main and standby services when the OTN module is protected by 1+1. At this time, a problem cannot be avoided: the throughput of the core transmission chip of which the front end is responsible for NP processing is halved (as shown in fig. 2), and in a P2MP scene, learning information generated by the active/standby ports of the ODUk protection access is possibly provided with two active/standby ODUk ports and MAC when the active/standby switches and the previous learning information is not aged, so that the phenomenon of MAC address drift occurs (as shown in fig. 3).

Disclosure of Invention

The invention provides a system, a method and POTN equipment for realizing ODUk protection by using an equivalent protection class, which are used for solving or at least partially solving the technical problem of low capacity utilization rate of a core transmission chip in the prior art.

In order to solve the above technical problem, a first aspect of the present invention provides a system for implementing ODUk protection by using an equivalent protection class, including:

the NP module comprises a packet preprocessing unit and an FEC configuration unit, wherein the packet preprocessing unit is used for preprocessing a received message, the FEC configuration unit is used for configuring a selective transmission matching table of a downward call direction and a selective reception filtering table of an upward call direction by using an equivalent protection class, wherein fields of the selective transmission matching table comprise an FEC index value, a downward call direction ID and a work enabling mark of a main and standby ODUk of the downward call direction, and fields of the selective reception filtering table comprise a port index value, an upward call direction ID and a work enabling mark of the main and standby ODUk of the upward call direction;

the OTN module is used for acquiring the alarm information of the ODUk layer and sending the alarm information to the APS module, selecting an output port of the main ODUk or the standby ODUk to forward the message according to the generated selected switching command, and/or determining that the message passes through an input port of the main ODUk or the standby ODUk according to the generated selected switching command;

and the APS module comprises an alarm generating unit and a main control state machine, wherein the alarm generating unit is used for generating APS alarm information according to the alarm information of the ODUk layer, the main control state machine is used for generating a selected switching command according to the APS alarm information and sending the selected switching command to the OTN module, and/or generating a selected switching command according to the APS alarm information and sending the selected switching command to the OTN module, wherein the selected switching command is used for switching the value of the work enabling mark of the master ODUk in the downlink direction, and the selected switching command is used for switching the value of the work enabling mark of the master ODUk in the uplink direction.

In one embodiment, the working enable flag of the active ODUk and the standby ODUk in the downstream direction includes 0 and 1, where 0 indicates that the output port of the active ODUk is valid, and 1 indicates that the output port of the standby ODUk is valid, and the OTN module is specifically configured to:

when the generated selected switching command is to switch the value of the work enabling mark of the main and standby ODUk in the downlink direction from 0 to 1, selecting an outlet port of the standby ODUk to forward the message;

when the generated selected switching command is to switch the value of the work enabling flag of the main and standby ODUk in the downlink direction from 1 to 0, the output port of the main ODUk is selected to forward the message.

In one embodiment, the working enable flag of the primary and secondary ODUk in the upstream direction includes 0 and 1, where 0 indicates that the output port of the primary ODUk is valid, and 1 indicates that the output port of the secondary ODUk is valid, and the OTN module is specifically configured to:

when the generated selected and received switching command is to switch the value of the work enabling mark of the main and standby ODUk in the uplink direction from 0 to 1, determining that the message passes through an input port of the standby ODUk;

when the generated selected and received switching command is to switch the value of the work enabling flag of the main and standby ODUk in the uplink direction from 1 to 0, it is determined that the message passes through the ingress port of the main ODUk.

In one embodiment, the APS module further comprises a master state machine maintenance unit for maintaining the state of the master state machine.

In one embodiment, the APS alert information includes an alert type, a protection type, and switching information.

Based on the same inventive concept, a second aspect of the present invention provides a method for implementing ODUk protection by using an equivalent protection class, where the ODUk protection method includes an ODUk protection service in a lower voice direction, and the ODUk protection service in the lower voice direction includes:

the received message is preprocessed to be processed,

configuring a selective transmission matching table of the call-down direction by using an equivalent protection class, wherein the fields of the selective transmission matching table comprise an FEC index value, a call-down direction ID and a work enabling mark of a call-down direction master/slave ODUk;

collecting alarm information of an ODUk layer;

generating APS alarm information according to the alarm information of the ODUk layer;

generating a selected switching command according to the APS alarm information, wherein the selected switching command is used for switching the value of a work enabling mark of the main/standby ODUk in the downlink direction;

and selecting an output port of the main ODUk or the standby ODUk to forward the message according to the generated selected switching command.

In an embodiment, the method further includes ODUk protection service in an upstream direction, including:

preprocessing a message forwarded from an output port of the main ODUk or the standby ODUk;

configuring a selective call filtering table of the upward call direction, wherein the field of the selective call filtering table comprises a port index value, an upward call direction ID and a work enabling mark of the main and standby ODUk of the upward call direction;

collecting alarm information of an ODUk layer;

generating a selected and received switching command according to the APS alarm information, wherein the selected and received switching command is used for switching the value of a work enabling mark of the main/standby ODUk in the uplink direction;

and determining that the message passes through the inlet port of the main ODUk or the standby ODUk according to the generated selected and received switching command.

In one embodiment, the method further includes updating learning information in the P2MP scene, including:

creating a VSI instance and a multicast ID corresponding to vpls service in a P2MP scene, and adding the output ports of all members of the vpls service into a multicast group corresponding to the VSI instance and the multicast ID;

when the learning information is not updated, flooding the incoming message in a multicast group corresponding to the VSI instance and the multicast ID;

when learning information is updated, the same FEC index value is associated with the main ODUk and the standby ODUk ports under the same ODUk protection service, and the FEC index value is used as learning information of the main ODUk and the standby ODUk ports of the corresponding ODUk protection service.

Based on the same inventive concept, a third aspect of the present invention provides a pots device comprising the system of the first aspect and a PTN device.

Compared with the prior art, the invention has the following advantages and beneficial technical effects:

the invention provides a system for realizing ODUk protection by using an equivalent protection class, wherein an FEC configuration unit of an NP module uses the equivalent protection class to configure a selective transmission matching table of a lower call direction and a selective reception filtering table of an upper call direction, and the selective transmission matching table of the lower call direction comprises a main and standby 2 matching table established based on the working state of the ODUk main and standby. After the packet preprocessing unit preprocesses the packet, the packet is not sent by the main ODUk output port and the standby ODUk output port, but the alarm information of the ODUk layer is collected and sent to the APS module, after the main control state machine of the APS module updates the sending state of the downlink direction according to the APS alarm information transmitted by the opposite end, a corresponding selective sending switching command is generated, and the selective sending switching command is used for switching the value of a working enabling flag of the main ODUk and the standby ODUk in the downlink direction, and one designated working path is determined and output by the switching command, so that the selective sending effect of ODUk mapping is realized, and the middle ODUk processing module still creates two forwarding paths to achieve the fast and efficient switching of protection, thereby solving the technical problem that the capacity utilization rate of the core transmission chip is low.

Further, when the P2MP learns, learning information is changed from the original PORT+MAC to the FEC index value+MAC, so that only one piece of learning information is generated when the ODUk is protected, all messages are flooded and multicast to all member PORTs in the VSI when the messages are not learned, the service messages are directly sent to the ODUk PORTs corresponding to the FEC index value when the messages are learned, and the service messages are sent to the designated ODUk path through table lookup, thereby avoiding the problem of MAC address drift generated by learning of a plurality of MAC in the ODUk protection scene.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced, and the following description will be obvious. The drawings described herein are illustrative of certain embodiments of the present invention and other drawings may be made by those skilled in the art without the benefit of the present inventive subject matter.

Fig. 1 is a schematic diagram of normal service in a P2P scenario of a pots device in the prior art;

fig. 2 is a schematic diagram of a protection service in a P2P scenario of an OTN device in the prior art;

fig. 3 is a schematic diagram of general learning information of a pots device in a P2MP scenario in the prior art;

fig. 4 is a schematic diagram of a carrying path and a switching signal of an OTN protection service in an uplink and downlink direction in a P2P scenario in an embodiment of the present invention;

fig. 5 is a schematic diagram of an OTN forwarding path of an ODUk protection service in an embodiment of the present invention;

fig. 6 is a schematic diagram of learning information of FEC in a P2MP scenario in an embodiment of the present invention.

Detailed Description

The invention provides a system for realizing ODUk protection by using an equivalent protection class, wherein an FEC configuration unit of an NP module uses the equivalent protection class to configure a selective transmission matching table of a lower call direction and a selective reception filtering table of an upper call direction, and the selective transmission matching table of the lower call direction comprises a main and standby 2 matching table established based on the working state of the ODUk main and standby. After the packet preprocessing unit preprocesses the packet, the packet is not sent by the main ODUk output port and the standby ODUk output port, but the alarm information of the ODUk layer is collected and sent to the APS module, the main control state machine of the APS module updates the sending state of the downlink direction according to the APS alarm information transmitted by the opposite end, and then a corresponding selective sending switching command is generated, and the selective sending switching command is used for switching the value of the working enabling flag of the main ODUk and the standby ODUk in the downlink direction, and one designated working path is determined and output by the switching command, so that the selective sending effect of ODUk mapping is realized, and the middle ODUk processing module still creates two forwarding paths to achieve the fast and efficient switching of protection, thereby solving the technical problem that the core transmission chip capacity is low in utilization rate.

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1

The embodiment of the invention provides a system for realizing ODUk protection by using an equivalent protection class, which comprises the following steps:

The Chinese and English explanation of the features and terms referred to in this application is as follows:

l2 Switch two-layer Switch;

1+1Protection 1+1 protection;

1:1Protection 1:1 protection;

NP network processor

Working Entity host

Protection Entity for standby

POTNPOTN systems or apparatus

P2P point-to-point

P2MP point-to-multipoint

Mac Address Learn MAC address learning

Learning Information learning information

Unicast

Multicast Multicast

VSI two-layer switching domain

FEC equivalent protection class

MPLS multiprotocol label switching

VLAN virtual local area network

Specifically, referring to fig. 4, the two network element flows in the figure involve two network elements NE1 and NE2, where NE1 is a left network element and NE2 is a right network element.

Wherein each network element comprises: NP module, OTN module and APS module.

NP module: a packet preprocessing unit and an FEC configuration unit;

OTN module: the method comprises the steps of collecting and sending alarm information of an ODUk layer, and selecting a mapping channel;

APS module: and generating APS alarm information and generating a switching command.

The NP module is a grouping preprocessing module, the frame is a core processing unit of the OTN module, the APS module is an alarm acquisition and processing module, the main control state machine is a part of the module, and the ETH is a message receiving module.

Specifically, the packet preprocessing unit performs preprocessing on the packet service packet, such as VLAN editing or MPLS encapsulation, the FEC configuration unit creates a selected matching table and a selected filtering table, and includes two selected matching tables (including a FEC index value, tx_frr_id of a sending direction (a downlink direction) corresponding to a working enable flag of a sending direction main/standby ODUk), two selected filtering tables (including a FEC index value, rx_frr_id of a receiving direction (a downlink direction) corresponding to a working enable flag of a receiving direction main/standby ODUk), and sends the packet service packet to the OTN module.

The OTN module collects the alarm information of the layer through the frame, when the OTN module is a receiving party, namely, the packet service message is loaded to the ODUk, corresponding to the call-down direction, the primary ODUk or the standby ODUk outlet port is selected to forward the message according to the generated selected switching command, when the OTN module is a transmitting party, the packet in the ODUK particle is solved, corresponding to the call-up direction, and at the moment, the message is determined to pass through the primary ODUk or the standby ODUk inlet port according to the generated selected switching command.

And the APS module is used for generating APS alarm information according to the alarm information of the ODUk layer through the alarm generation unit, and generating a selected switching command according to the APS alarm information by the master control state machine at the home terminal when the call is in the down direction, wherein the APS alarm information is transmitted by the sink terminal at the moment.

When the call is in the uplink direction, the local end master control state machine generates a selected and received switching command according to the APS alarm information, and the APS alarm information at the moment is the alarm information of the local end ODUk layer.

In a specific implementation process, the alarm information of the ODUk layer mainly includes corresponding information such as trace tracking/performance inspection monitoring/fault type in overhead information in the ODUk, and the APS alarm information includes comprehensively determining a switching condition of the service of the layer according to the alarm information of the ODUk layer and the current service type, where a relationship between the two information is equivalent to a relationship between a data source and a decision maker.

Specifically, for the selective transmission matching of the downlink direction, the FEC index value is used as an index of the ODUk protection configuration to be mapped by the packet, the downlink direction ID is tx_frr_id, which indicates the ID of the fast switching of the downlink direction, the main and standby ODUKs are associated with the same tx_frr_id, the working enable flag of the main and standby ODUk of the downlink direction is status, the main and standby ODUk corresponds to two selective transmission matches, and the key values of the two other fields are the same except status fields. The source end main control state machine switches the value of the work enabling mark of the main and standby ODUk in the downlink direction through the APS alarm information transmitted by the host end, so that a mapping path is selected, namely whether the message is forwarded from the outlet port of the standby ODUk or the outlet port of the main ODUk is selected.

For the optional filtering table of the uplink direction, the port index value field indicates the index of the ODUk port, the uplink direction ID is rx_frr_id, the ID indicating the fast switching of the uplink direction, the main and standby oduks are associated with the same rx_frr_id, the work enabling flag of the main and standby ODUk of the uplink direction is status, the main and standby ODUk corresponds to two optional filtering tables, and the key values of the two other fields are the same except status fields. And the main control state machine switches the value of the work enabling mark of the main and standby ODUk in the uplink direction according to the local end ODUk alarm information, and filters the service flow in the non-work state, namely, determines whether the message passes through the inlet port of the main ODUk or the inlet port of the standby ODUk. As shown in fig. 4, the ingress port of the primary ODUk is filtered, and the ingress port of the secondary ODUk is determined to pass through.

By creating bi-directional active-standby OTN crossings between source and sink frames, an APS alert message is intermediately generated, where the APS alert message primarily conveys alert types, protection types, and switching information, which can guarantee the application of unidirectional/bi-directional protection (as shown in fig. 5).

Example two

Based on the same inventive concept, the present embodiment provides a method for implementing ODUk protection by using an equivalent protection class, where the method for ODUk protection includes an ODUk protection service in a downlink direction, and the ODUk protection service in the downlink direction includes:

the received message is preprocessed to be processed,

collecting alarm information of an ODUk layer;

In the specific implementation process, taking fig. 4 as an example, when the call is in the downlink direction, the packet service message is loaded into the ODUk, the network element on the left side enters the packet, the source end refers to the network element on the left side, and the destination end refers to the network element on the right side.

The Packet arrives at the NP module after entering from the NE1 ETH module, the Packet is preprocessed (such as vlan editing or mpls packaging), and an equivalent protection class is used for configuring a selective transmission matching table of the downlink direction, wherein the fields of the selective transmission matching table comprise an FEC index value, a downlink direction ID and a work enabling mark of a main/standby ODUk of the downlink direction; generating APS alarm information according to the alarm information of the sink ODUk layer, selecting a path according to the APS alarm information, selecting an output port of the main ODUk or the standby ODUk to forward a message, and mapping the packet message into a corresponding ODUk pipeline to reach NE2 through optical fiber transmission.

If the frame on the NE2 line board generates an alarm of the ODUk layer, after the APS module collects the alarm, the main control state machine composes APS information according to the actual protection type and transmits the APS information to the NE1, and after the main control state machine of the NE1 collects the APS alarm information, the main control state machine transmits a selected switching command (switching the value of a working enabling mark of the main ODUk in the downlink direction of the NE 1) to the service board of the network element.

collecting alarm information of an ODUk layer;

In the specific implementation process, taking fig. 4 as an example, when the call is in the uplink direction, the packet in ODUk is parsed, and the source end (home end) refers to the network element on the right side, and NE2. Firstly, preprocessing a message forwarded from an output port of a main ODUk or a standby ODUk, configuring a selective receiving filter table in an uplink direction, collecting alarm information of a local ODUk layer, generating a selective receiving switching command, determining that the message passes through an input port of the main ODUk or the standby ODUk according to the generated selective receiving switching command, and then sending the message from an ETH module.

If frame on the line board of NE2 generates an alarm of the ODUk layer, after the APS module of NE2 collects the alarm, the main control state machine forms APS information according to the actual protection type and the alarm state, and generates a selected and received switching command (the value of a work enabling mark of the main and standby ODUk of the uplink direction of NE2 is switched).

In the implementation process, one vpls service corresponds to one VSI (two-layer switching domain), all vpls members share one VSI instance, before learning, an incoming message will be flooded in all members in the VSI instance, the multicast ID is an mc_id, which is used to implement the process of replication and multicast, and all vpls members will be added to the multicast group corresponding to the VSI instance and the multicast ID.

vpls members refer to the output ports corresponding to all members of the same vpls service in a network element.

As shown in fig. 6, the same FEC index value is associated with the same ODUk port protected by the same ODUk and the same standby ODUk port, and the FEC index value is used as learning information of the corresponding ODUk protected primary and standby ports, and at this time, learning information generated from a packet sent from the ODUk primary and standby ports is changed from the original port+mac to fec+mac. When learning information is updated, the service message is directly sent to an ODUk port corresponding to the FEC index value (i.e. the port is determined according to the FEC index value), and is sent to a designated ODUk path through table lookup, so that the problem of MAC address drift generated by multiple MAC learning in an ODUk protection scenario is avoided.

Example III

Based on the same inventive concept, this embodiment provides a pots apparatus comprising the system described in embodiment one and a PTN apparatus.

Since the device described in the fourth embodiment of the present invention is a device including the system for implementing ODUk protection by using the equivalent protection class in the first embodiment of the present invention, based on the system described in the first embodiment of the present invention, a person skilled in the art can understand the specific structure and the modification of the device, and therefore, the description thereof is omitted herein. All POTB devices that include the system of the first embodiment of the present invention are within the scope of the present invention.

It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims and the equivalents thereof, the present invention is also intended to include such modifications and variations.

Claims

1. A system for implementing ODUk protection using an equivalent protection class, comprising:

2. The system for implementing ODUk protection by using an equivalent protection class according to claim 1, wherein the working enable flag of the active ODUk and the standby ODUk in the downstream direction includes 0 and 1, where 0 indicates that the output port of the active ODUk is valid, 1 indicates that the output port of the standby ODUk is valid, and the OTN module is specifically configured to:

3. The system for implementing ODUk protection by using an equivalent protection class according to claim 1, wherein the work enable flag of the active-to-talk direction primary-standby ODUk includes 0 and 1, where 0 indicates that the output port of the active ODUk is valid, 1 indicates that the output port of the standby ODUk is valid, and the OTN module is specifically configured to:

4. The system for implementing ODUk protection using an equivalent protection class according to claim 1, wherein the APS module further comprises a master state machine maintenance unit configured to maintain a state of the master state machine.

5. The system for implementing ODUk protection using an equivalent protection class according to claim 1, wherein the APS alert information includes an alert type, a protection type, and switching information.

6. A method for implementing ODUk protection by using an equivalent protection class, wherein the ODUk protection method includes an ODUk protection service in a lower voice direction, and the ODUk protection service in the lower voice direction includes:

the received message is preprocessed to be processed,

collecting alarm information of an ODUk layer;

7. The ODUk protection method of claim 6, further comprising an ODUk protection service in an upstream direction, including:

collecting alarm information of an ODUk layer;

8. The ODUk protection method of claim 7, further comprising updating learning information in a P2MP scenario, comprising:

9. A pots apparatus comprising the system of claim 1 and a PTN apparatus.