WO2009074002A1

WO2009074002A1 - A device and method for implementing a channel of signaling communication network and management communication network

Info

Publication number: WO2009074002A1
Application number: PCT/CN2008/000297
Authority: WO
Inventors: Zhiyong Yu; Guocai Gui
Original assignee: Zte Corporation
Priority date: 2007-12-11
Filing date: 2008-02-03
Publication date: 2009-06-18
Also published as: KR101463289B1; CN101188534B; KR20100106467A; CN101188534A

Abstract

A device and method for implementing a channel of signaling communication and management communication network are provided. The device comprises a network element control single board and at least one optical interface single board connected by Ethernet interface; the network element control single board is used to accomplish routing protocol, process or forward Ethernet message; the optical interface single board is used to insert or extract overhead of the optical signal and adapt and forward optical signal message with different formats. By using Ethernet technique, the ECC network management signaling of the optical transport network element device and the signaling of ASON can use a common data bus, by the third layer switch unit implemented by hardware, the pressure of the CPU unit can be reduced; SCN and MCN channel with large capacity and high speed can be realized in transport device at the lowest cost, the channel is not only compatible with the original IP over PPP external interface, but also provides large bandwidth, low CPU load and the bus multiplexing function, thereby providing a support of stronger processing capacity for implementing the intelligence of optical transport device.

Description

TECHNICAL FIELD The present invention relates to a synchronous digital system technology and an optical transmission system technology, and more particularly to an SCN and MCN channel implementation device for an optical transmission device and method. BACKGROUND In an optical transmission device (SDH/OTH device), a Signaling Communication Network (SCN) and a Management Communication Network (MCN) are cores for implementing control signaling transmission and network management of an optical transmission device. platform. The traditional SCN and MCN channels generally use two high-level data link control (HDLC) buses of 2 Mbps to 8 Mbps to serve as communication channels between the network element control board (NCP) and each board. The optical transmission network element device uses a standard IP over PPP (Point-to-Point Protocol) method, that is, the IP data packet is encapsulated into a point-to-point protocol frame, and the network management signaling is transmitted through the MCN bearer channel, and ASON signaling is transmitted through the SCN bearer channel. With the development of SDH (Synchronous Digital Hierarchy) technology and OTH (Optical Transport System) technology, VC3 VC4 granular service based on GMPLS (Generalized Multi-protocol Label Switching) protocol, based on light Wavelength services and packet-based services, such as unified intelligent scheduling and protection recovery, have become the development trend of next-generation SDH technology and OTH technology. With the intelligent development of the network, the traffic of management and control signaling is becoming larger and larger. When the number of device ports is large, the traditional HDLC bus cannot be carried. The CPU of the network element control board cannot handle so many forwarding reports. Text. In order to meet the new demands of bandwidth and communication quality in technology development, a new way to implement the internal SCN and MCN buses of the transmission equipment is needed to provide greater bandwidth, lower CPU load and fewer buses. In the prior art, Ethernet is a widely used communication technology, with a large number of open protocols and a large number of chip support, but the prior art does not adopt Ethernet technology to implement SCN and MCN signaling channels. Therefore, the prior art has drawbacks and needs improvement. SUMMARY OF THE INVENTION The object of the present invention is to provide an apparatus and method for implementing a signaling communication network and a communication communication network channel. The technical problem to be solved is how to implement the SCN and MCN signaling channels by using Ethernet technology, which can be used with the original The IP over PPP external interface is compatible, providing high bandwidth, low CPU load and bus multiplexing. The technical solution of the present invention is as follows: A device for implementing a signaling communication network and a communication network channel, wherein the network element control board and the at least one optical interface board connected through the Ethernet interface; The board is used to complete routing protocols, process or forward Ethernet packets. The optical interface card is used to insert and extract optical signals. The optical signals of different formats are adapted and forwarded. In the device, the network element control board includes a CPU unit, a layer 3 switching unit, and each signaling interface. The CPU unit is configured to configure and manage the layer 3 switching unit, and process the ether. The network packet is used to complete the routing protocol and forward the Ethernet packet. The device, wherein the Layer 3 switching unit includes a routing module, configured to associate an IP with a virtual local area network to implement fast forwarding of IP packets. In the device, the optical interface board includes an interface unit, an overhead processing unit, and an interface processing unit; the interface unit is configured to complete external connection, photoelectric conversion, and transmitting signals; For the insertion and extraction of the optical signal, the packet adaptation unit is configured to adapt and forward the optical signal of different formats, and the format of the optical signal is a PPP frame or an Ethernet frame. The device is configured to perform a point-to-point physical connection between the network element control board and each optical interface board through a backplane Ethernet interface. A method for implementing a signaling communication network and a communication network channel for a device including a network element control board and at least one optical interface board, the method includes the following steps: Al, the optical interface board receives the optical signal and After the PPP is decapsulated, the external packet is encapsulated into an Ethernet frame, and the destination address and the virtual local area network identifier are added to the network element control board. The content of the frame includes at least one of a signaling communication network message or a management communication network. A2. The network element control board receives the Ethernet frame, and determines that the content is an IP packet and its destination address. If the network element is not the local network element, it is forwarded to the destination address; otherwise, the content of the Ethernet frame is processed; the method further includes the following sending step: Bl, the network element control board sends the Ethernet frame After the optical interface board decapsulates the Ethernet frame, the optical interface card is encapsulated into a PPP frame; B3, according to the virtual local area network identifier, the PPP frame is inserted into the optical signal overhead. send. The method, wherein: in step A1, when the Ethernet frame is encapsulated, related information is further added; the related information includes at least one of a source address, a label protocol identifier, an IP4 text type, or a frame check sequence. The method, wherein the step A1 further performs the following steps: configuring the overhead location; the overhead location includes at least one of a data communication channel, an extended data communication channel, or a universal communication channel. The method, the decapsulating specifically includes the following steps: after performing frame delimitation, error detection, and extracting information, determining whether the encapsulated data is an IP packet, and then extracting an IP packet, otherwise extracting a PPP payload . With the above solution, the present invention enables the optical transmission network element device by utilizing the technology of Ethernet.

ECC network management signaling and ASON signaling can share the data bus, and the three-layer switching unit implemented by hardware can reduce the pressure of the CPU unit; thereby realizing a large-capacity and high-speed SCN and MCN channel in the transmission device at the lowest cost, The original IP over PPP external interface is compatible, and provides the functions of large bandwidth, low CPU load and bus multiplexing, and provides stronger processing capability for intelligent implementation of optical transmission equipment. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic structural view of an apparatus of the present invention; FIG. 2 is a schematic diagram of an external network networking of the apparatus of the present invention; FIG. 3 is a flow chart of signaling transmission of the method of the present invention; FIG. 4 is a schematic diagram of SCN and MCN channels of the method of the present invention; Implement the schematic. DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The object of the present invention is to propose a novel apparatus and method for implementing SCN and MCN channels applied to an optical transmission device, by which the advantages of the Ethernet platform can be fully utilized to provide a high bandwidth and high quality SCN for the transmission equipment. And MCN channel. The present invention provides a device for implementing a signaling communication network and a communication channel for managing a communication network. The network element control board NCP of the optical transmission network element device is used as a processing core, and each optical interface board is used as an auxiliary processing unit, and the network element is controlled. A physical connection between the board and each optical interface card can be performed through the Ethernet interface on the backplane. The NE control board functions as the packet routing and processing core. The high-speed CPU unit and switching unit are integrated to complete the routing protocol and internal Ethernet. Network frame switching and interaction of external IP packets; Each optical interface card mainly completes packet buffering and adaptation processing in different frame formats inside and outside the optical transmission network element device. As shown in FIG. 1 , the device of the present invention includes a network element control board connected to an Ethernet interface and at least one optical interface board. The network element control board is used to complete routing protocols, process or forward Ethernet packets. The optical interface board is used for inserting and extracting the overhead of the optical signal, and adapting and forwarding the optical signal of different formats. In general, the network element control board and each optical interface board can be connected to each other through a backplane Ethernet interface. If necessary, the network element control board and each optical interface can also be used. The boards are connected directly through the Ethernet interface and are set on a single board. For example, the network element control board includes a CPU unit, a layer 3 switching unit, and each signaling interface; the CPU unit is configured to configure and manage the layer 3 switching unit, and process the Ethernet port; The Layer 3 switching unit is configured to complete routing and forwarding the Ethernet packet. The Layer 3 switching unit may include a routing module, configured to manage a routing table, and configure a relationship between the IP and the virtual local area network to associate the IP with the virtual local area network to implement fast forwarding of the IP4 message. The device of the optical interface includes an interface unit, an overhead processing unit, and a message adaptation unit; the interface unit is configured to complete external connection, photoelectric conversion, and transmit signals; and the overhead processing unit is configured to insert And the overhead of extracting the optical signal; the ^ ^:适配 text adaptation unit is configured to adapt and forward the optical signal packet of different formats, and the format of the optical signal packet is a PPP frame or an Ethernet frame. The following is a complete example of a single network element device of the present invention. As shown in FIG. 1, a single network element may specifically include the following units.

CPU unit: Responsible for protocol and algorithm processing, located on the NCP board. Layer 3 switching unit: Responsible for Ethernet 4 转发 text forwarding, IP 艮交换 exchange, CPU unit through the corresponding communication interface to implement the configuration management of the switching unit and data exchange with the switching unit, located on the NCP board. The packet adaptation unit: performs packet buffering and adaptation processing in different frame formats of the optical transmission network element device. One end of the packet buffer unit of each optical interface card passes the backplane Ethernet interface and the NCP single. The switch unit of the board implements a point-to-point physical connection. The other end of the packet buffer unit is connected to the overhead processing unit, and the buffer unit is located on the optical interface board. The overhead processing unit is configured to complete the extraction and insertion of the associated overhead bytes in the SDH/OTH frame structure, and is located on the optical interface board as an intermediate unit between the buffer unit and the interface unit. Interface unit: Complete external fiber connection and corresponding optical/electrical conversion functions, etc., located on the optical connection π board. When the device network of the present invention is used, as shown in FIG. 2, the CPU unit interface of the NCP board of the network element, the automatic switched optical network (ASON) out-of-band signaling interface, the network management signaling interface (Q _X port), and The ECC (Error Check Correction) network management system and the ASON interface of the other NEs use the IP switching mode for signaling interaction. The internal Layer 3 switching network uses VLANs to isolate the data flows of each port. The routing table of the layer switching unit determines the relationship between the IP and the VLAN, so that the IP packet can be quickly forwarded, and the CPU is not required to participate in the forwarding action, thereby reducing the CPU speed pressure. The internal network of the transport network element is based on the pure Ethernet mode. The external signaling, including the ECC gateway signaling and the ASON signaling, is required to use the optical interface card to complete the format of the IP/PPP frame and the Ethernet frame. Each optical interface is connected to a subnet. The transmission device internally isolates data frames between different subnets by means of VLANs or channels. The communication between external subnets needs to be configured through a three-layer exchange. Moreover, as shown in FIG. 3, the present invention also provides a method for implementing a signaling communication network and managing a communication network channel for use in the above apparatus. As described above, the device includes a network element control board and at least one optical interface board, and the network element control board and the optical interface board are connected through an Ethernet interface. The method includes the following steps of receiving signals.

On the optical interface, the optical interface receives the optical signal and extracts the overhead. The optical signal includes the SDH or OTH signal. After the PPP is decapsulated, the external signaling is encapsulated into the Ethernet frame. The destination address and the virtual local area network identifier are added to the network element. Control the board. The decapsulation may specifically include the following steps: after performing frame delimitation, error detection, and extracting information, determining whether the encapsulated data is an IP packet, and then extracting the IP packet, otherwise extracting the PPP payload. In step A1, when the Ethernet frame is encapsulated, in addition to adding the destination address and the virtual local area network identifier, related information may be added; the related information includes at least a source address, a label, a protocol identifier, an IP packet type, or Frame School - one of the sequences. In the present invention, the content of the Ethernet frame includes at least one of a signaling communication network or a management communication network message, thereby implementing SCN and MSN channels. And, step A1 may further perform the following steps: configuring the overhead location; the overhead location includes at least one of a data communication channel, an extended data communication channel, or a universal communication channel.

A2: The network element control board receives the Ethernet frame, determines that the content is an IP address, and the destination address is not the local network element, and then forwards to the destination address; otherwise, processes the content of the Ethernet frame. For example, ECC network management signaling and ASON signaling are transmitted on the connection side of the device, and can be divided into the following steps. Step 1: The receiving unit of the interface unit of the optical interface receives the SDH or OTH signal, and extracts the SDH or OTH segment overhead through the overhead processing unit. The overhead location used therein can be configured by software, and the overhead location can be SDH DCC (Data Communication Channel), Extended DCC, or OTC GCC (Universal Communication Channel), and other overheads that the system configuration needs to extract. Since ECC and ASO signaling may be split into two channels for transmission or use the same channel, the overhead locations used by ECC and ASON signaling should be individually configurable and can be shared or separated. Step 2: The message adaptation unit performs PPP decapsulation of ECC/ASON signaling, completes frame delimitation, error detection, etc., if the encapsulated IP packet, extracts an IP packet, such as a encapsulated non-IP packet, Extract the PPP frame payload. In the third step, the packet adaptation unit encapsulates the IP packet and the PPP frame payload into the Ethernet frame, and adds the Ethernet-related destination address, source address, TPID (tag protocol identifier), and VLAN ID (virtual ID). The proposed LAN identifier, Type, Ethernet FCS (Frame Check Sequence), etc., are sent out through the backplane Ethernet. Identifying another ¹ J, wherein the Type VLAN ID for which the overhead channels may be used to distinguish packets IP and non-IP packets. Step 4: The Layer 3 switching unit of the NCP board receives and identifies the received Ethernet data frame. If the IP packet of the local network element is not the IP address, the packet is sent to the board. The CPU unit, otherwise forwarded according to the IP address, and forwards the IP packet through the port that the port is supposed to exchange and mark. Step 5: The CPU unit of the NCP board processes the data packets belonging to the local network element (ECC signaling and ASON signaling protocol operation). And, the method further includes the following sending step.

B. The network element control board sends an Ethernet frame to the optical interface card.

B2> the optical interface card decapsulates the Ethernet frame and encapsulates the PPP frame into the PPP frame;

B3. Insert the PPP frame into an overhead of the optical signal according to the virtual local area network identifier and send the PPP frame. For example, ECC network management signaling and ASON signaling are transmitted on the transmitting side of the device, and can be divided into the following steps. Step 1: The CPU unit of the NCP board sends the MCN and SCN 4 packets of the Ethernet package to the switching unit. Step 2: The switching unit of the NCP board processes the 4 艮 message sent by the CPU unit and the IP packet forwarded by the fourth step of the receiving side according to the content of the message, and sends it to the corresponding port. Step 3: The optical interface board completes the decapsulation of the Ethernet frame, and after demarcation and VLAN information is presented, if the IP packet is encapsulated, the IP packet is extracted, such as a packaged non-IP packet. Then extract the PPP payload. Step 4: The 适配适配 adaptation unit encapsulates the IP packet and the PPP payload into a PPP frame, and sends the VLAN ID extracted according to the third step to the corresponding overhead processing unit. Step 5: The optical interface board overhead processing unit inserts the PPP frame into the SDH or OTH segment overhead and sends it out through the interface unit. The overhead used is the same as the receiving side and can be configured via software. The present invention will be further described in detail below by taking an SDH transmission device as an example. As shown in FIG. 4, it is a schematic diagram of the SCN and MCN channels proposed in the present invention implemented in the device.

The NCP board includes a CPU unit and a Layer 3 switching unit. The optical interface board includes a 4 艮 text adaptation unit and an SDH overhead processing and interface unit. The 4 艮 text adaptation unit mainly implements mutual conversion between the Ethernet frame and the PPP frame. Cache, SDH Framer (Overhead Processing Unit) Enables the insertion and extraction of SDH overhead. An optical interface card can support multiple optical ports, that is, multiple DCCs. The backplane of the optical interface card is connected to the Layer 3 switching unit of the NCP board through the Ethernet physical layer chip (PHY). The bandwidth is 100M. Because the SDH NE device may have multiple optical interface cards, the NCP needs to provide multiple network ports to interconnect with the optical interface cards. The backplane Ethernet of the entire SDH network element device forms an end-to-end star. Network structure. On the receiving side, the SDH Framer of the optical interface card in the SDH network element completes the SDH overhead of each optical port and sends it to the packet buffering and adaptation processing unit. After the PPP data packet is de-frame buffered, it passes through the Ethernet. The framing process is performed, and the corresponding VLAN is sent to the corresponding backplane Ethernet port. After passing the PHY chip on the NCP board, the packet is sent to the Layer 3 switching unit of the NCP board. The high-speed switch chip is the core, and an IP routing entry is established internally. The routing entry can be generated by the software through a routing protocol. When the switch chip receives the data packet, it first confirms whether it is an IP packet, and the non-IP packet is directly sent to the CPU unit for processing. If the IP packet is an IP address and the destination IP address is the address of the node, it is also sent to the CPU unit of the node for processing. Otherwise, the switching unit sends it to the specified output port according to the routing entry. The required processing steps on the transmitting side are similar to those on the receiving side, except that the processing order is the reverse of the receiving side, and the present invention is not limited thereto. It is to be understood that those skilled in the art can make modifications and changes in the form of the above description, and all such modifications and changes are intended to fall within the scope of the appended claims.

Claims

Claim

An apparatus for implementing a signaling communication network and a communication communication network channel, comprising: a network element control board and at least one optical interface board connected through an Ethernet interface;

The network element control board is configured to complete a routing protocol, process, or forward an Ethernet packet. The optical interface board is configured to insert and extract optical signal overhead, and adapt and forward optical signal packets of different formats. .

2. The device according to claim 1, wherein the network element control board comprises a CPU unit, a layer 3 switching unit, and each signaling interface;

The CPU unit is configured to configure and manage the Layer 3 switching unit, and process the Ethernet network;

The Layer 3 switching unit is configured to complete a routing protocol and forward the Ethernet.

The device according to claim 2, wherein the Layer 3 switching unit comprises a routing module, configured to associate an IP with a virtual local area network to implement fast forwarding of IP packets.

The device according to claim 1, wherein the optical interface board comprises an interface unit, an overhead processing unit, and a message adaptation unit;

The interface unit is configured to complete external connection, photoelectric conversion, and transmit signals; the overhead processing unit is configured to insert and extract an optical signal;

The packet adaptation unit is configured to adapt and forward optical signal packets of different formats, and the format of the optical signal packet is a PPP frame or an Ethernet frame.

The device according to claim 1, wherein the network element control board and the optical interface boards are physically connected point-to-point through the backplane Ethernet interface.

A device for implementing a signaling communication network and a communication network channel, which is used in an apparatus including a network element control board and at least one optical interface board, the method comprising the following steps:

The optical interface of the optical interface receives the optical signal and extracts the overhead. After the PPP is decapsulated, the external interface is encapsulated into the Ethernet frame, and the destination address and the virtual local area network identifier are added to the network element control board. The content of the network frame includes at least one of a signaling communication network message or a management communication network message; A2: The network element control board receives the Ethernet frame, determines that the content is an IP address, and the destination address is not the local network element, and then forwards to the destination address; otherwise, processes the content of the Ethernet frame. .

7. The method according to claim 6, wherein the method further comprises the following sending step:

B1. The NE control board sends an Ethernet frame to the optical interface card.

B2, the optical interface card decapsulates the Ethernet frame, and then encapsulates the packet into a PPP frame;

B3. Insert the PPP frame into an optical signal for transmission according to the virtual local area network identifier and send the PPP frame.

The method according to claim 6, wherein, in step A1, when the Ethernet frame is encapsulated, related information is further added; the related information includes at least a source address, a label protocol identifier, an IP packet type or a frame. One of the checksum sequences.

The method according to claim 6, wherein the step A1 further performs the following steps: configuring the overhead location; the overhead location comprises at least one of a data communication channel, an extended data communication channel, or a universal communication channel .

The method according to claim 6, wherein the decapsulating comprises the following steps: after performing frame delimitation, error detection, and extracting information, determining whether the encapsulated data is an IP packet, and then extracting IP packet, otherwise extract PPP payload.