CN102801601B - The implementation method of PTN compatible MSTP network EoS business and equipment - Google Patents

Abstract

The invention relates to a method and equipment for realizing the EoS service of a PTN network compatible with an MSTP network. The PTN network and the MSTP network communicate with each other through an STM-N rate interface at the docking point. The PTN device receives the EoS service delivered from the MSTP network through the STM-N rate interface, analyzes the EoS service to obtain the first data service and encapsulates and forwards the first data service; the analysis includes the first data service delivered through the LSP A packet tunnel label for the second data service, after parsing and encapsulating the second data service, sending it to the MSTP network through the STM-N rate interface. The present invention connects the PTN and the MSTP network through the STM-N rate interface to transmit the data service, save slots and bandwidth resources, the data service transmission distance is longer, and the selection of the geographical location of the PTN and MSTP docking equipment is more accurate. to be flexible.

Description

PTN Compatible MSTP Network EoS Service Implementation Method and Equipment

technical field

The invention relates to the technical field of communication, in particular to a method and equipment for realizing the EoS service of a PTN compatible MSTP network.

Background technique

With the rapid growth of bandwidth requirements for data services, the bearer network is migrating from circuit switching to packet switching. The MSTP (Multi-Service Transport Platform, multi-service transport platform) composed of SDH (Synchronous Digital Hierarchy) and EoS (Ethernet Service Transport Platform) network, as a typical representative of circuit switching, is being replaced by PTN (Packet Transport Network, Packet Transport Network) based on packet switching technology. However, for a long period of time to come, MSTP network will not be abandoned, but will coexist with PTN. The two networks, PTN and MSTP network, need to be integrated, interface docking, and business interoperability.

The MSTP network carries data services by encapsulating the data services entering the network through the Ethernet interface of the access layer device through GFP (Generic Framing Protocol, general framing protocol), mapping them into VCG (Virtual Container Group, virtual container group), and then recombining them through VCG. In the SDH data frame with STM-N rate, it is transmitted in the form of SDH data frame within the MSTP network. After the data service is processed by this process, it becomes an EoS service. When the EoS service reaches the egress of the peer access layer device of the MSTP network, the SDH data frame is demultiplexed into VCG, VCG is demapped into GFP frame, and GFP is decapsulated to restore the data service.

The way the PTN network management carries the data service is that the data service entering the network through the PE (ProviderEdge, operator node) Ethernet interface is encapsulated by PWE3 (Pseudo-WireEmulationEdge-to-Edge, edge-to-edge pseudo-wire emulation) and pressed into the tunnel label , in the LSP (LabelSwitchPath, label switching path), through label switching and forwarding to the peer PE, after label ejection, decapsulation, and restoration of data services.

Since the PTN network and MSTP have different processing procedures for data services, when the data service transmission path needs to cross the PTN and MSTP networks, the two protocols need to be converted between the PTN and MSTP.

A method is provided in the prior art to realize Ethernet service intercommunication between a multi-service transport platform MSTP and a packet switching network PTN through a virtual container group VCG interface. However, there are the following limitations: 1) The upper and lower nodes of the Ethernet service must be of the same type of equipment, and the business can only be connected to and from the MSTP node, or from the PTN node, but cannot be realized from the PTN node on the MSTP node, or from the PTN node On the MSTP node off the business. 2) Intercommunication can only be achieved in the way that VC (virtual container, virtual container) 12 is mapped into VC4 (that is, VC12 virtual concatenation).

Contents of the invention

The main purpose of the present invention is to provide a PTN compatible MSTP network EoS service implementation method and equipment, to realize the EoS service intercommunication between the PTN and the MSTP network through the STM-N rate interface, and to realize the end-to-end transmission of data services across the PTN and MSTP networks .

The technical solution adopted by the present invention to solve its technical problems is:

A PTN network is compatible with an implementation method of MSTP network EoS service. The PTN network of the packet transport network and the MSTP network of the multi-service transport platform are intercommunicated at the docking place through the n-level STM-N rate interface of the synchronous transmission module. The method includes:

The PTN device receives the Ethernet EoS service based on Synchronous Digital Series SDH transmitted from the MSTP network through the STM-N rate interface, analyzes the EoS service to obtain the first data service, and encapsulates and forwards the first data service ;as well as

Analyzing the packet tunnel label containing the second data service delivered by the packet service provider LSP, and sending the second data service to the MSTP network through the STM-N rate interface after parsing and encapsulation processing.

Preferably, the PTN device receives the EoS service delivered from the MSTP network through the STM-N rate interface, specifically including:

When the first data service is transmitted from the MSTP network to the PTN network, at the connection between the PTN network and the MSTP network, the PTN device receives the EoS service encapsulated into SDH data frames transmitted from the MSTP network through the receiving end of the STM-N rate interface .

Preferably, said parsing the EoS service to obtain the first data service and encapsulating and forwarding the first data service specifically includes:

Demultiplexing the SDH data frame into a virtual container group VCG;

Demapping the VCG out of a general framing protocol GFP frame;

decapsulating the GFP into a first data service;

The first data service is encapsulated by edge-to-edge pseudowire emulation PWE3 and then pressed into a tunnel label, and forwarded to the destination node through label switching in the label switching path LSP.

Preferably, the parsing of the packet tunnel label containing the second data service delivered via the LSP specifically includes:

When the second data service is transmitted from the PTN network to the MSTP network, at the connection between the PTN network and the MSTP network, the PTN device will pop up the packet tunnel label containing the second data service transmitted through the LSP, decapsulate the PWE3, and restore the Second data service.

Preferably, the second data service is sent to the MSTP network through the STM-N rate interface after parsing and encapsulation processing, specifically including:

encapsulating the second data service into a VCG through GFP;

Multiplexing and encapsulating the VCG into an EoS service of SDH frame structure;

Send the EoS service to the MSTP device at the docking point through the sending end of the STM-N rate interface.

The present invention also provides a kind of PTN equipment, described PTN network and described MSTP network intercommunicate through STM-N rate interface at the joint, this PTN equipment is located at described joint, and described PTN equipment comprises:

A service receiving unit, configured to receive the EoS service delivered from the MSTP network through the STM-N rate interface, analyze the EoS service to obtain a first data service, and encapsulate and forward the first data service;

The service sending unit is configured to analyze the packet tunnel label containing the second data service transmitted through the LSP, and send the second data service to the MSTP network through the STM-N rate interface after parsing and encapsulation processing.

Preferably, the service receiving unit is configured to, when the first data service is transmitted from the MSTP network to the PTN network, at the connection between the PTN network and the MSTP network, the PTN device receives the data service transmitted from the MSTP network through the receiving end of the STM-N rate interface. The incoming EoS services that have been encapsulated into SDH data frames.

Preferably, the service receiving unit is further configured to demultiplex the SDH data frame into a virtual container group VCG; demap the VCG into a general framing protocol GFP frame; decapsulate the GFP into a first Data service: encapsulating the first data service through an edge-to-edge pseudowire emulation PWE3 and pressing it into a tunnel label, and then forwarding to the destination node through label switching in the label switching path LSP.

Preferably, the service sending unit is configured to, when the second data service is transferred from the PTN network to the MSTP network, pop out the packet tunnel label containing the second data service delivered via the LSP, decapsulate the PWE3, and restore the Second data service.

Preferably, the service sending unit is further configured to encapsulate the second data service into a VCG through GFP encapsulation; multiplex and encapsulate the VCG into an EoS service in an SDH frame structure; pass the STM-N rate interface The sending end sends the EoS service to the MSTP device at the docking point.

Implementing the technical solution of the present invention has the following beneficial effects: the PTN-compatible MSTP network EoS service implementation method and equipment provided by the present invention can be connected through the STM-N rate interface at the connection between the PTN and the MSTP network to transmit data services , saving slots and bandwidth resources, the transmission distance of data services is longer, and the selection of the geographical location of PTN and MSTP interconnection equipment is more flexible.

Description of drawings

Fig. 1 is the flow chart of the method provided by the embodiment of the present invention;

Fig. 2 is the network diagram of the PTN network compatible MSTP network EoS service equipment that the embodiment of the present invention provides;

Fig. 3 is the flow chart of the PTN equipment sending EoS service processing method provided by the embodiment of the present invention;

FIG. 4 is a flowchart of a method for processing a PTN device receiving an EoS service provided by an embodiment of the present invention;

Fig. 5 is a schematic structural diagram of a PTN device provided by an embodiment of the present invention.

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

An embodiment of the present invention provides a method for a PTN network compatible with an MSTP network EoS service, wherein the PTN network and the MSTP network communicate with each other through an STM-N rate interface at the docking point. Specifically, at the docking point, the PTN device communicates with the MSTP network Described MSTP equipment connects interworking EoS business through STM-N rate interface, as shown in Figure 1, this method comprises:

S110. The PTN device receives the EoS service delivered from the MSTP network through the STM-N rate interface, parses the EoS service to obtain a first data service, and encapsulates and forwards the first data service;

More specifically:

In this step S110, when the first data service is transmitted from the MSTP network to the PTN network, at the connection between the PTN network and the MSTP network, the PTN device receives the packaged data service transmitted from the MSTP network through the receiving end of the STM-N rate interface. EoS service of synchronous digital serial SDH data frame. Then: demultiplex the SDH data frame into a virtual container group VCG; demap the VCG into a general framing protocol GFP frame; decapsulate the GFP into a first data service; After being encapsulated by edge-to-edge pseudo-wire simulation PWE3, the tunnel label is pressed, and forwarded to the destination node through label switching in the label switching path LSP, and the label is popped and decapsulated by the destination node to obtain the restored first data business.

S120. Parse the packet tunnel label containing the second data service delivered by the packet service provider LSP, and send the second data service to the MSTP network through the STM-N rate interface after parsing and encapsulation processing.

More specifically:

In this step S120, when the second data service is transferred from the PTN network to the MSTP network, at the connection between the PTN network and the MSTP network, the PTN device pops out the packet tunnel label containing the second data service transferred via the LSP, and deactivates the PWE3 Encapsulating and restoring the second data service.

And the second data service is encapsulated by GFP and mapped into VCG; the VCG is multiplexed and encapsulated into EoS service of SDH frame structure; The MSTP device at the docking point is processed by the MSTP network and delivered to the destination node, and the MSTP device is processed and then delivered to the destination node, and the second data service is restored by the destination node and sent out MSTP network.

The method provided by the above embodiment connects the PTN and the MSTP network through the STM-N rate interface to transmit the data service, save slots and bandwidth resources, and the data service transmission distance is farther. The choice of location is more flexible.

The following provides specific application examples of the above methods:

Fig. 2 is the networking diagram of the PTN network compatible with the MSTP network EoS service equipment provided by the embodiment of the invention. As shown in Fig. 2, the networking includes a mutually connected PTN network and an MSTP network, the PTN network is composed of several PTN devices, and the MSTP network consists of It consists of several MSTP devices, where A and B are PTN devices, and C and D are MSTP devices. PTNB and MSTPC connect and communicate EoS services through the STM-N rate interface. PTNA and MSTPD are the upper and lower nodes of the data service.

The data service transmission path from the PTN network to the MSTP network is the node MSTPD inside the internal node PTNA-B-C-MSTP network. The data service transmission path from the MSTP network to the PTN network is the node MSTPD-C-B-PTN internal node PTNA inside the network.

The data service entering from the PTN network and exiting the MSTP network is transmitted along the path internal node PTNA-B-C-MSTP network internal node MSTPD, and when it reaches the PTN network device PTNB at the interface between the PTN network and the MSTP network, the processing method for PTNB to send the EoS service is as follows: As shown in Figure 3, including steps:

Step S201: PTN device B receives a packet containing data services transmitted from the LSP;

Step S202: PTN device B pops out the packet tunnel label;

Step S203: PTN equipment B decapsulates PWE3 to output data services;

Step S204: PTN equipment B encapsulates the data service into the GFP frame;

Step S205: PTN device B maps the GFP frame into VCG;

Step S206: PTN equipment B multiplexes VCG into SDH data frames;

Step S207: The PTNB sends the EoS service encapsulated into an SDH data frame to the connected MSTP network device through the STM-N rate interface.

The EoS service enters the MSTPC, passes overhead processing and circuit switching, and is transmitted to the MSTPD through the internal nodes of the MSTP network. The VCG is demapped to the GFP frame, the GFP frame is encapsulated, the data service is restored, and the data service is sent out of the MSTP network.

The data service entering from the MSTP network and leaving the PTN network is transmitted along the path network internal node MSTPD-C-B-PTN network internal node PTNA, and when it arrives at the PTNB where the PTN network and the MSTP network are connected, the processing method for PTNB to receive the EoS service is shown in Figure 4. instructions, including the steps to:

Step S301: PTN equipment B receives the EoS service from the STM-N rate interface;

Step S302: PTN equipment B demultiplexes the SDH data frame into VCG;

Step S303: The PTN device B demaps the VCG into the GFP frame;

Step S304: The PTN device B decapsulates the GFP frame into a data service;

Step S305: PTN device B performs PWE3 encapsulation on the data service;

Step S306: PTN device B pushes the PWE3-encapsulated data into the tunnel label

Step S307: PTN device B sends the packet containing the data service to the internal node of the PTN network.

The packet is forwarded to PTN device A through label switching along the LSP. The label is popped up on PTN device A, PWE3 is decapsulated, the data service is restored, and the data service is sent out of the PTN network.

The embodiment of the present invention also provides a PTN device, the PTN network communicates with the MSTP network through the STM-N rate interface at the docking point, the PTN device is located at the docking point, and the PTN device is shown in Figure 5, include:

The service receiving unit 510 is configured to receive the EoS service delivered from the MSTP network through the STM-N rate interface, analyze the EoS service to obtain a first data service, and encapsulate and forward the first data service;

More specifically, the service receiving unit 510 is configured to, when the first data service is transferred from the MSTP network to the PTN network, at the connection between the PTN network and the MSTP network, the PTN device receives the data service from the receiving end of the STM-N rate interface. The EoS service that has been encapsulated into a synchronous digital series SDH data frame delivered by the MSTP network; and is also used to demultiplex the SDH data frame into a virtual container group VCG; demap the VCG into a general framing protocol GFP Frame; decapsulate the GFP into the first data service; encapsulate the first data service through the edge-to-edge pseudo wire emulation PWE3 and push it into the tunnel label, and forward it to the destination through label switching in the label switching path LSP node.

The service sending unit 520 is configured to analyze the packet tunnel label containing the second data service transmitted through the LSP, and send the second data service to the MSTP network through the STM-N rate interface after parsing and encapsulation processing .

More specifically, the service sending unit 520 is configured to, when the second data service is transmitted from the PTN network to the MSTP network, at the connection between the PTN network and the MSTP network, the PTN device will transmit the second data service from the LSP to include the second data service. The packet tunnel label of the data service pops up, decapsulates the PWE3, and restores the second data service; and is also used to encapsulate the second data service through GFP and map it into a VCG; multiplex and encapsulate the VCG into an SDH frame Structured EoS service; send the EoS service to the MSTP device at the docking point through the sending end of the STM-N rate interface.

The devices provided in the above embodiments are connected through the STM-N rate interface at the connection between the PTN and MSTP networks to transmit data services, saving slots and bandwidth resources, and the data service transmission distance is longer. The choice of location is more flexible.

The above 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 protection scope of the present invention. Inside.

Claims (6)

1. A PTN network is compatible with the implementation method of MSTP network EoS service, it is characterized in that, described PTN network and described MSTP network are intercommunicated by synchronous transmission module n level STM-N rate interface at docking place, wherein, described PTN network It is a packet transport network, the MSTP network is a multi-service transport platform, and the method includes: The PTN device receives the Ethernet EoS service based on Synchronous Digital Series SDH transmitted from the MSTP network through the STM-N rate interface, analyzes the EoS service to obtain the first data service, and encapsulates and forwards the first data service , wherein, the PTN device receives the EoS service transmitted from the MSTP network through the STM-N rate interface, specifically including: when the first data service is transmitted from the MSTP network to the PTN network, at the connection between the PTN network and the MSTP network, the PTN The device receives the EoS service that has been encapsulated into SDH data frames transmitted from the MSTP network through the receiving end of the STM-N rate interface; and Analyzing the packet tunnel label containing the second data service delivered by the packet service provider LSP, and sending the second data service to the MSTP network through the STM-N rate interface after parsing and encapsulation processing, wherein, The parsing of the packet tunnel label containing the second data service delivered via the LSP specifically includes: when the second data service is delivered from the PTN network to the MSTP network, at the connection between the PTN network and the MSTP network, the PTN device will transfer the label from the LSP to the MSTP network. The transmitted packet tunnel label containing the second data service is ejected, the PWE3 encapsulation is decapsulated, and the second data service is restored. 2. The method according to claim 1, wherein said parsing the EoS service to obtain the first data service and encapsulating and forwarding the first data service specifically includes: Demultiplexing the SDH data frame into a virtual container group VCG; Demapping the VCG out of a general framing protocol GFP frame; decapsulating the GFP into a first data service; The first data service is encapsulated by edge-to-edge pseudowire emulation PWE3 and then pressed into a tunnel label, and forwarded to the destination node through label switching in the label switching path LSP. 3. The method according to claim 1, wherein the second data service is sent to the MSTP network through the STM-N rate interface after parsing and encapsulation processing, specifically comprising: encapsulating the second data service into a VCG through GFP; Multiplexing and encapsulating the VCG into an EoS service of SDH frame structure; Send the EoS service to the MSTP device at the docking point through the sending end of the STM-N rate interface. 4. A kind of PTN equipment, it is characterized in that, PTN network and MSTP network intercommunicate by STM-N rate interface at the docking place, wherein, described PTN network is a packet transport network, and described MSTP network is a multi-service transport platform; the PTN The equipment is located at the docking place, and the PTN equipment includes: A service receiving unit, configured to receive the EoS service delivered from the MSTP network through the STM-N rate interface, analyze the EoS service to obtain the first data service and encapsulate and forward the first data service, wherein, when When the first data service is transmitted from the MSTP network to the PTN network, at the connection between the PTN network and the MSTP network, the PTN device receives the EoS service encapsulated into SDH data frames transmitted from the MSTP network through the receiving end of the STM-N rate interface; A service sending unit, configured to parse the packet tunnel label containing the second data service delivered via the LSP, and send the second data service to the MSTP network through the STM-N rate interface after parsing and encapsulation processing, Wherein, when the second data service is transferred from the PTN network to the MSTP network, popping out the packet tunnel label containing the second data service delivered through the LSP, decapsulating the PWE3, and restoring the second data service. 5. The PTN device according to claim 4, wherein the service receiving unit is further configured to demultiplex the SDH data frame into a virtual container group VCG; demap the VCG out of a general framing protocol GFP frame; decapsulate the GFP into the first data service; encapsulate the first data service through the edge-to-edge pseudowire simulation PWE3 and then press it into the tunnel label, and forward it to the destination through label switching in the label switching path LSP ground node. 6. The PTN device according to claim 4, wherein the service sending unit is also configured to map the second data service into a VCG through GFP encapsulation; and multiplex and encapsulate the VCG into an SDH frame structure EoS service; send the EoS service to the MSTP device at the docking point through the sending end of the STM-N rate interface.