WO2012171384A1 - Procédé et dispositif de mise en œuvre de service d'émulation de circuit dans un réseau optique passif - Google Patents

Procédé et dispositif de mise en œuvre de service d'émulation de circuit dans un réseau optique passif Download PDF

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Publication number
WO2012171384A1
WO2012171384A1 PCT/CN2012/072963 CN2012072963W WO2012171384A1 WO 2012171384 A1 WO2012171384 A1 WO 2012171384A1 CN 2012072963 W CN2012072963 W CN 2012072963W WO 2012171384 A1 WO2012171384 A1 WO 2012171384A1
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WIPO (PCT)
Prior art keywords
ces
mpls
data packet
mac address
label
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PCT/CN2012/072963
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English (en)
Chinese (zh)
Inventor
顾中林
张蓉
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中兴通讯股份有限公司
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Publication of WO2012171384A1 publication Critical patent/WO2012171384A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0803—Configuration setting
    • H04L41/0806—Configuration setting for initial configuration or provisioning, e.g. plug-and-play
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0064—Arbitration, scheduling or medium access control aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0073—Provisions for forwarding or routing, e.g. lookup tables

Definitions

  • the present invention relates to a passive optical network and a multi-protocol label switching (MPLS) technology, and more particularly to a method and system for implementing circuit simulation in a passive optical network.
  • MPLS multi-protocol label switching
  • Circuit Emulation Service is a general term for transmitting Time Division Multiplex and Multiplexer (TDM) services through an asynchronous packet switching network.
  • TDM networks such as El, T1, etc., based on circuit-switched technology, can provide reliable quality of service, but their service types are single, expensive, and the flexibility of upgrading, extending, and interworking is poor, and with IP data.
  • the development of the network with its cost advantages, strong expansion and upgrade and compatibility, is becoming a major business requirement and will dominate the future network architecture. For operators, in order to maximize the return on assets and minimize operating expenses, it is highly desirable to integrate traditional multi-service networks into a single network technology. Therefore, IP data networks have become the first choice for operators.
  • MEF focused on the PDH (Plesiochronous Digital Hierarchy, plesiochronous digital series of bad 1 J) or SDH (Synchronous Digital Hierarchy, Synchronous Digital Hierarchy) traffic carried implement a circuit emulation (MEF8) over Ethernet, IETF's PWE3 working group
  • PDH Packet Switching Network
  • ITU standard Y.1413 is a proposal for implementing TDM on an MPLS network. It defines the format of the service carried over the MPLS network. Necessary functional requirements for TDM-MPLS network interworking. Summary of the invention
  • the best carrier for the bearer circuit emulation service is IP or MPLS packet-switched network. Due to some well-known deficiencies in traditional IP networks such as traffic engineering and QoS, MPLS packet-switched networks are based on their control forwarding plane separation. And the nesting capability of the label stack, etc., to implement the circuit simulation service on the MPLS network platform, not only can a large number of value-added services, but also can shield the difference of the core network, which gradually dominates the circuit simulation business.
  • the technical problem to be solved by the present invention is to provide a method and system for implementing circuit simulation in a passive optical network, and implementing a circuit simulation service in a passive optical network.
  • a method for implementing circuit simulation in a passive optical network includes:
  • the circuit simulation (CES) uplink data packet is sent to the remote device through the MPLS tunnel through the MPLS tunnel; and the CES downlink data packet of the remote device is received through the MPLS tunnel, and the CES downlink data packet is passed through the pseudowire chain.
  • the road is sent to the optical network unit.
  • the method further includes: after the optical network unit is established, sending the CES uplink data message to the optical line terminal includes:
  • the optical network unit receives time division multiplexing (TDM) data, assembles into a TDM payload, encapsulates the TDM payload into a data packet, and configures a source media access control (MAC) address of the data packet as a MAC address of the local CES chip.
  • TDM time division multiplexing
  • MAC media access control
  • Configure the destination MAC address as the MAC address of the optical line terminal configure the VLAN ID as the VLAN ID of the pseudowire link, and configure the outer MPLS label and the inner MPLS label.
  • the outer MPLS label is The static label switched path (LSP) forwarding label is stipulated by the optical line terminal, and the inner MPLS label is a differentiated identifier of the pseudowire link, and the CES downlink data packet is sent to the optical line terminal through the pseudowire link.
  • the transmitting, by the optical line terminal, the CES uplink data packet to the remote device by using the MPLS tunnel includes:
  • the optical line terminal After receiving the CES uplink data packet, the optical line terminal replaces the source MAC address of the CES uplink data packet with the MAC address of the local MPLS line card, replaces the destination MAC address with the MAC address of the remote device, and replaces the VLAN ID with The VLAN ID of the MPLS tunnel, and the outer MPLS label is replaced with the dynamic LSP forwarding label negotiated with the remote device.
  • the CES uplink data packet is sent to the remote device through the MPLS tunnel.
  • the yuan includes:
  • the optical line terminal After receiving the CES downlink data packet, the optical line terminal replaces the destination MAC address of the CES downlink data packet with the MAC address of the CES chip, replaces the source MAC address with the MAC address of the local MPLS line card, and sets the VLAN ID. Replace the VLAN ID of the pseudowire link with the outer MPLS label and replace it with the static LSP forwarding label, and send the CES downlink data packet to the optical network unit through the pseudowire link.
  • the method further includes: after receiving the CES downlink data packet, the optical network unit decapsulates the CES downlink data packet and sends the TDM data to the TDM port, including:
  • the optical network unit After receiving the CES downlink data packet, the optical network unit extracts the TDM payload and recovers the clock signal, and sends the TDM payload to the TDM port according to the clock signal.
  • a system for implementing circuit simulation in a passive optical network comprising: an optical line terminal, an optical network unit, and a remote device, where:
  • the optical line terminal is configured to: establish a pseudowire link with the optical network unit, establish a multi-protocol label switching (MPLS) tunnel with the remote device, and receive a circuit simulation (CES) uplink data packet of the optical network unit through the pseudowire link.
  • the CES uplink data packet is sent to the remote device through the MPLS tunnel; and the CES downlink data packet of the remote device is received by the MPLS tunnel, and the CES downlink data packet is sent to the optical network unit through the pseudowire link;
  • the remote device is configured to send CES downlink data packets to the optical line terminal through the MPLS tunnel.
  • the optical network unit comprises a CES chip, wherein:
  • the CES chip is configured to receive time division multiplexing (TDM) data, assemble into a TDM payload, encapsulate the TDM payload into a data packet, and configure a source media access control (MAC) address of the data packet as its own MAC address.
  • TDM time division multiplexing
  • MAC source media access control
  • the outer MPLS label is The static label switching path (LSP) forwarding label agreed by the optical line terminal, the inner layer MPLS label is a distinguishing identifier of the pseudo line link, and the CES downlink data packet is sent to the optical line terminal through the pseudo line link.
  • LSP static label switching path
  • the optical line termination comprises an MPLS line card, wherein:
  • the MPLS line card is set to: Replace the source MAC address of the CES uplink data packet with its own MAC address, replace the destination MAC address with the MAC address of the remote device, and replace the VLAN ID. It is the VLAN ID of the MPLS tunnel, and the outer MPLS label is replaced with the dynamic LSP forwarding label negotiated with the remote device.
  • the CES uplink data packet is sent to the remote device through the MPLS tunnel.
  • the MPLS line card is further configured to: receive the CES downlink data packet through the MPLS tunnel, replace the destination MAC address of the CES downlink data packet with the MAC address of the CES chip, and replace the source MAC address with its own MAC address.
  • Replace the VLAN ID with the VLAN ID of the pseudowire link replace the outer MPLS label with the static LSP forwarding label, and send the CES downlink data packet to the optical network unit through the pseudowire link.
  • the circuit emulation chip is further configured to: receive the CES downlink data packet, extract the TDM payload, recover the clock signal, and send the TDM payload to the TDM port according to the clock signal.
  • the embodiment of the present invention can implement a multi-hop PW connection combined with a static and dynamic label in an optical access network, and the LDP runs on the OLT, and serves as both a LER and an LSR (Label Switching Router), ONU.
  • the dynamic MPLS function is not required, and the ONU can be isolated from the MPLS network to reduce the functional complexity of the ONU, so that only the Layer 2 switching function needs to be supported, and the circuit simulation of the MPLS network can be realized.
  • 1 is a schematic overall network diagram of a circuit emulation service according to an embodiment of the present invention
  • 2 is a schematic diagram of a circuit emulation message frame format according to an embodiment of the present invention
  • FIG. 3 is a flow chart of a data processing method according to an embodiment of the present invention. Preferred embodiment of the invention
  • the invention is in an ONU (Optical Network Unit) and an OLT (Optical Line)
  • a static PW (Pseudo Wire) link is established between the terminal and the optical line terminal.
  • the OLT and the Far Equipment (FE) run LDP (Label Distribution Protocol) to establish a dynamic MPLS tunnel.
  • LDP Label Distribution Protocol
  • LER Label Switching Edge Router
  • the circuit emulation service has two directions of sending and receiving.
  • the ONU is in the uplink direction to the OLT, and the OLT is in the downlink direction to the ONU.
  • the ONU can compress the TDM data according to the PWE3 protocol, and can use the structured or unstructured mode.
  • the destination MAC address of the uplink packet is configured as the MAC address of the MPLS line card on the OLT, and the frame header includes the double-layer static MPLS label.
  • the outer label is a static label (label switching path) forwarding label that is agreed with the OLT, and the inner label is used as a distinguishing identifier of different PWs.
  • the OLT After receiving the CES uplink message, the OLT replaces the destination MAC address with the MAC address of the FE that dynamically negotiates the connection, replaces the source MAC address with the MAC address of the MPLS line card, and replaces the VLAN with the VLAN specified by the established MPLS connection.
  • the outer label is replaced with a dynamic LSP forwarding label negotiated with the FE, and the CES uplink packet is sent to the MPLS network.
  • the OLT line card of the OLT replaces the destination MAC address of the packet with the MAC address of the CES chip on the corresponding ONU, and replaces the source MAC address of the packet with the MPLS line.
  • the MAC address of the card is replaced with the VLAN configured with the static PW link between the ONUs.
  • the static LSP forwarding label of the outer layer is replaced with the static outer label of the ONU, and then the packet is sent to the ONU.
  • the CES chip (such as Z Ol lx of Zarlink) recovers the clock signal from the message and extracts the payload, and sends the data to the TDM port according to the clock signal.
  • the overall networking structure of the circuit emulation service of the present invention includes:
  • the ONU 101 and ONU 102 are optical network units. Two are listed here as examples. The star connection between the ONU and the OLT is actually more. The number depends on the number of OLTs supported and the application requirements.
  • the ONU 101 and the ONU 102 are at the user end, and provide a TDM interface (such as an E1/T1 interface), and include a CES chip for encapsulating, decapsulating, and recovering clocks of TDM data.
  • the OLT 103 is an optical line terminal and is at the central office, and performs Layer 2 communication with the ONU 101 and the ONU 102 via an optical fiber.
  • the LER and the LSR are used as the entire circuit emulation system.
  • the OLT 103 includes an MPLS line card 104, and processes the packets sent by the ONU 101 and the ONU 102, and forwards the packets to the MPLS network 105 via the LDP protocol, and simultaneously receives the texts sent by the MPLS network 105. After being processed, the OLT 103 sends the packets to the ONUs 101 and the ONUs 102. .
  • the MPLS network 105 is a network composed of any number of LSRs, and processes the LDP protocol to implement MPLS routing.
  • the FE 106 establishes a dynamic MPLS tunnel connection with the OLT 103, processes the received and received MPLS packets, and performs circuit simulation processing.
  • the processing method can use the method of the present invention, and the existing method can also be used, which is not limited herein.
  • processing the content of the packet includes: encapsulating and decapsulating the TDM payload on the ONU 101 of FIG. 1; At the MPLS line card 104 of 1, the MAC address of the packet header, the MPLS label, and the like are stripped and replaced.
  • the encapsulation format in Figure 2 follows the ITU-T Y.1413 standard, in which the destination MAC, source MAC, VLAN tag, and Ethertype fields of the header follow the IEEE 802.3 standard, in Figure 1.
  • the destination MAC is the MAC address of the MPLS line card 104
  • the VLAN ID is the VLAN ID of the pseudowire link between the ONU 101 and the OLT 103.
  • the destination MAC is replaced with the FE 106.
  • the MAC address, the source MAC address is replaced with the MAC address of the MPLS line card
  • the VLAN ID is replaced with the VLAN ID of the MPLS tunnel on the MPLS line card, where it is replaced with the original field in the reverse direction.
  • the outer label of the MPLS is the LSP forwarding label.
  • the ONU101 and the OLT 103 are The static configuration field is dynamically negotiated in the MPLS network between the MPLS line card and the FE.
  • the dynamic and static label replacement processing is performed on the MPLS line card.
  • the MPLS inner label is used as the PW identifier. It is statically configured when it is encapsulated in the ONU. It is directly forwarded in the back-end network and is not processed.
  • the PW control word and the RTP header are the encapsulation layers of the circuit emulation service, and the RTP header can be configured as needed, complying with the RFC 3550 standard.
  • TDM payload data configurable length in bytes in unstructured mode, in frame mode in structured mode (eg, one frame of E1 is 32 bytes), if the entire packet length (including FCS field) ) Less than 64 bytes, the chip automatically adds a static padding field after the payload data, so that the length reaches 64 bytes.
  • FIG. 3 is a flowchart of a data processing method according to the embodiment.
  • the data processing includes a local sending and receiving process and a remote sending and receiving process.
  • the processing method and system of the FE 106 in the network diagram of FIG. 1 are assumed to be the same as the local. In this way, only local data processing can be described.
  • the processing flow of one frame data message will be described in detail according to FIG.
  • Step 301 Receive data from the TDM port of the ONU and encapsulate the data into a data packet.
  • the TDM data received from the TDU port of the ONU may optionally form a payload in a structured or unstructured manner, and the unstructured manner is to obtain data from any position of the TDM data bit stream, and to use words.
  • the unit is the unit, and the payload is composed according to the configured length.
  • the structuring method parses the TDM data content, framing it according to the multiframe format information carried in the frame, and composing the payload from the beginning of each frame according to the configured number of frames. After the TDM payload is formed, it is encapsulated into a data packet.
  • the packet header includes a double-layer MPLS label.
  • the outer label is a static LSP forwarding label
  • the inner label is a PW distinguishing identifier.
  • Step 302 Send the data packet to the OLT through the optical network.
  • This step is for Layer 2 transmission of the optical network and does not involve the MPLS network.
  • Step 303 Perform a replacement process on a part of the field of the data message frame header.
  • the OLT After receiving the data packet sent by the ONU, the OLT replaces the destination MAC address with the MAC address of the remote FE of the MPLS dynamic negotiation connection (here, the MAC address of the MPLS line card on the peer OLT, the same below), and replaces the source MAC address.
  • the destination MAC address with the MAC address of the remote FE of the MPLS dynamic negotiation connection (here, the MAC address of the MPLS line card on the peer OLT, the same below), and replaces the source MAC address.
  • the MAC address of the MPLS line card replace the VLAN ID with the VLAN ID of the established MPLS tunnel connection configuration, and replace the static outer label with the peer PE.
  • the dynamic LSP forwarding label of the quotient For the MAC address of the MPLS line card, replace the VLAN ID with the VLAN ID of the established MPLS tunnel connection configuration, and replace the static outer label with the peer PE.
  • Step 304 Send the processed data packet to the MPLS network.
  • Step 305 Receive a data packet from the MPLS network.
  • Step 306 Processing a data packet frame header related field
  • the MPLS line card of the OLT After the MPLS line card of the OLT receives the packet through the established MPLS tunnel, replace the destination MAC address of the packet with the MAC address of the CES chip on the ONU, and replace the source MAC address of the packet with the MAC address of the MPLS line card.
  • the ID is replaced with the VLAN ID of the static PW link configured with the ONU.
  • the dynamic outer layer LSP forwarding label is replaced with the static outer label configured with the ONU.
  • Step 307 Send the processed data packet to the ONU.
  • Step 308 Decapsulate the data packet and send the TDM data to the TDM port.
  • the ONU After receiving the data packet, the ONU performs a series of protocol check on the packet header. After the verification succeeds, the ONU extracts the TDM payload from the packet, and recovers from the packet arrival rate and the timestamp information in the packet.
  • the clock signal is output, where the clock signal is the data rate if it is unstructured, and the data rate and frame pulse are two signals if it is structured.
  • the payload After the payload is extracted, the data is sent to the TDM port according to the recovered clock signal.
  • modules and steps of the present invention can be implemented by a general computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or their Multiple modules or steps are implemented as a single integrated circuit module. Thus, the invention is not limited to any particular combination of hardware and software.
  • the embodiment of the present invention can implement a multi-hop PW connection combined with a static and dynamic label in an optical access network.
  • the OLT runs the LDP protocol and acts as both a LER and an LSR (Label Switching Router).
  • the ONU does not need to support dynamics.
  • the MPLS function can isolate the ONU from the MPLS network and reduce the functional complexity of the ONU, so that it only needs to support the Layer 2 switching function to implement circuit simulation of the MPLS network.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention porte sur un procédé et un dispositif de mise en œuvre d'un service d'émulation de circuit dans un réseau optique passif. Le procédé consiste à : établir une liaison par pseudo-circuit entre une unité de réseau optique (ONU) et un terminal de ligne optique (OLT) ; établir un tunnel de commutation multiprotocole par étiquette (MPLS) entre le terminal de ligne optique et un équipement distant ; par le terminal de ligne optique, recevoir un paquet de données de liaison montante de service d'émulation de circuit (CES) de l'unité de réseau optique par la liaison par pseudo-circuit, et envoyer le paquet de données de liaison montante CES à l'équipement distant par le tunnel MPLS ; et recevoir un paquet de données de liaison descendante CES de l'équipement distant par le tunnel MPLS, et envoyer le paquet de données de liaison descendante CES à l'unité de réseau optique par la liaison par pseudo-circuit. Selon la présente invention, une connexion par pseudo-circuit à plusieurs bondes avec étiquettes dynamiques et statiques combinées peut être mise en œuvre dans un réseau d'accès optique, un protocole de distribution d'étiquettes est exécuté sur un terminal de ligne optique, et une unité de réseau optique (ONU) n'a pas besoin de prendre en charge une fonction MPLS dynamique, ce qui réduit la complexité de fonctions de l'ONU.
PCT/CN2012/072963 2011-06-15 2012-03-23 Procédé et dispositif de mise en œuvre de service d'émulation de circuit dans un réseau optique passif WO2012171384A1 (fr)

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CN103560940B (zh) * 2013-10-31 2017-01-18 华为技术有限公司 数据报文转发方法及设备
CN107508738B (zh) * 2017-07-31 2021-03-19 江西山水光电科技股份有限公司 一种基于ces业务的bfd的实现方法及设备
CN107465742B (zh) * 2017-08-02 2023-06-23 上海欣诺通信技术股份有限公司 利用udp隧道技术实现非对称业务的分流设备及其方法

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