WO2014019221A1

WO2014019221A1 - Data switching method, device and system

Info

Publication number: WO2014019221A1
Application number: PCT/CN2012/079656
Authority: WO
Inventors: 操时宜
Original assignee: 华为技术有限公司
Priority date: 2012-08-03
Filing date: 2012-08-03
Publication date: 2014-02-06
Also published as: CN102907054A; CN102907054B

Abstract

The present invention relates to a data switching method, device and system, the data switching device comprising a line card and a switching card optically connected with the line card. The line card comprises a receiving and forwarding module, a line card scheduling signal module, and a burst encapsulating and transmitting module; the switching card comprises a switching card scheduling signal module, an optical switching module, and a scheduling module. The line card and the switching card of the present invention are optically connected, such that the optical switching module of the switching card performs switching on an optical layer and directly outputs an optical signal, thus addressing the complex structure of a three-tier multi-plane switching architecture in a multi-chassis cluster of routers or switches in the prior art, and reducing the power consumption of the whole data switching device.

Description

Data exchange method, device and system

Technical field

The embodiments of the present invention relate to the field of communications technologies, and in particular, to a data exchange method, apparatus, and system.

Background of the invention

As user traffic grows, so does the need for router or switch capacity, but the cross-capacity growth that routers or switches can achieve is limited, and cannot keep up with traffic growth. Multi-chassis cascaded routers or switch clusters will become the mainstream architecture for core routers or switches.

A multi-chassis cascaded router or switch cluster is generally a three-level (S1, S2, and S3) multi-plane switching fabric: LCC (Line Card) Chassis, line card box) contains plane separation or combination, S1 and S3 level exchange; FCC (Fabric Chassis, the exchange box) contains S2 level exchanges. However, a multi-chassis cascaded router or switch cluster simply limits the power consumption of a single-chassis router or switch in the cluster to an acceptable level, which does not reduce the total power consumption of the entire cluster. Conversely, in the case of the same capacity, the multi-chassis cascaded router or switch cluster increases the total power consumption of the cluster by increasing the power consumption of the optical interconnect between the single frames based on the single-frame router or switch.

Summary of the invention

An object of the embodiments of the present invention is to provide a data exchange method, apparatus, and system, which can reduce power consumption of a router or a switch.

In one aspect, an embodiment of the present invention provides a data switching apparatus, including a line card and a switch card optically connected thereto, the line card including a receiving and forwarding module, a line card scheduling signal module, and a burst package transmitting module, the switching card The switch card scheduling signal module, the optical switching module, and the scheduling module are included:

The receiving and forwarding module is configured to receive a first optical signal that is sent by the optical network device and that carries the first data packet, convert the first optical signal into an electrical signal, and extract the first data packet and send the The burst package transmitting module;

The line card scheduling signal module is configured to receive scheduling application information sent by the receiving and forwarding module, send the scheduling application information to the switching card scheduling signal module, and receive a scheduling permission from the switching card scheduling signal module. Information, and sending the scheduling permission information to the burst package transmitting module;

The switching card scheduling signal module is configured to receive the scheduling application information sent by the line card scheduling signal module, send the scheduling application information to the scheduling module, to request scheduling permission information from the scheduling module, and Transmitting the scheduling permission information sent by the scheduling module to the line card scheduling signal module;

The scheduling module is configured to receive scheduling application information sent by the switching card scheduling signal module, generate scheduling permission information according to the scheduling application information, and send the scheduling permission information to the switching card scheduling signal module and the Optical switching module

The burst-encapsulated transmitting module is configured to encapsulate and convert the first data packet into a second optical signal according to the scheduling permission information, and send the signal to the optical switching module.

The optical switching module is configured to perform optical switching on the second optical signal according to the scheduling permission information, and output a third optical signal in a burst mode.

The burst package transmitting module includes:

a burst encapsulation module, configured to encapsulate the first data packet into an optical burst according to the scheduling permission information, and send the data packet to a transmitting module;

And a transmitting module, configured to receive the optical burst sent by the burst encapsulating module, and convert it into a second optical signal in a continuous mode or a burst mode and send the optical burst to the optical switching module.

Specifically, the burst encapsulation module is specifically configured to carry the first data packet in an optical burst OB or an optical packet OP or at least one optical cell OC.

The line card scheduling signal module includes a line card scheduling signal transceiver module, the switch card scheduling signal module includes a switch card scheduling signal transceiver module, the line card scheduling signal transceiver module and the switch card scheduling signal transceiver module The optical connection is performed, and the scheduling application information and the scheduling permission information are transmitted by an optical signal.

Or the line card scheduling signal module includes a line card scheduling signal encapsulating module and a line card scheduling signal extracting module, where the switching card scheduling signal module comprises a switching card scheduling signal encapsulating module and a switching card scheduling signal extracting module, the line card Transmitting, by the scheduling signal module and the switching card scheduling signal module, the scheduling application information and the scheduling permission information by using the second optical signal and the third optical signal;

The line card scheduling signal encapsulating module is configured to receive the scheduling application information sent by the receiving and forwarding module, and package the scheduling application information into a first optical burst and send the information to the burst encapsulation transmitting module;

The burst-embedded transmitting module is further configured to package the first optical burst with the burst encapsulated by the first data packet and convert the second optical signal into a second optical signal and send the optical signal to the optical switching module.

The optical switching module is further configured to extract the first optical burst from the first optical burst and the burst encapsulated by the first data packet, and send the signal to the switch card for scheduling signal extraction. Module

The switching card scheduling signal extraction module is configured to extract the scheduling application information from the first optical burst, and send the scheduling application information to the scheduling module, where the scheduling module applies according to the scheduling The information generates scheduling permission information and sends the scheduling information to the switch card scheduling module;

The switching card scheduling signal encapsulating module is configured to receive scheduling permission information sent by the scheduling module, and the scheduling permission information is loaded into a second optical burst and sent to the optical switching module;

The optical switching module is further configured to convert, by the second optical burst sent by the switch card scheduling signal encapsulating module, with the optical burst encapsulated by the first data packet, into an optical signal, and send the optical signal to the line card. Scheduling signal extraction module;

The line card scheduling signal extraction module is configured to receive an optical signal sent by the optical switching module, extract the second optical burst, extract the scheduling permission information, and send the scheduling permission information to the The burst encapsulated transmitting module, and the optical burst encapsulated by the first data packet are sent to the optical network device.

The receiving and forwarding module includes:

a receiving module, configured to receive a first optical signal that is sent by the optical network device and that carries the first data packet, convert the first optical signal into an electrical signal, and extract the first data packet and send the information to the media access Control the MAC module;

a MAC module, configured to perform physical layer decoding, data link layer decoding, and link layer protocol processing on the first data packet, and send the first data packet to a network processing NP module;

The NP module is configured to receive the first data packet, query the forwarding table information according to the source address information of the first data packet, and update the destination address information of the first data packet and send the information to the traffic management module. ;

a TM module, configured to perform queuing management on the received data packet according to the scheduling permission information according to the destination address information to obtain scheduling application information, send scheduling application information to the line card scheduling signal module, and after queuing management The data message is sent to the burst package transmitting module.

The source address information and the destination address information include: a media access control MAC destination address and a source address, and/or a multi-protocol label switching MPLS outgoing label and an incoming label, and/or an Internet Protocol IP destination address and a source address;

The forwarding table information includes a correspondence between the MAC destination address and the source address, and/or a correspondence between the MPLS outgoing label and the incoming label, and/or a correspondence between the IP destination address and the source address.

The optical switching module is a rotating arrayed waveguide grating matrix or an optical switch matrix.

In another aspect, an embodiment of the present invention provides a data exchange method, including:

The receiving and forwarding module receives the first optical signal that is sent by the optical network device and carries the first data packet, converts the first optical signal into an electrical signal, and extracts the first data packet and sends the first data packet to the burst package transmitting module. ;

a line card scheduling signal module, receiving scheduling application information sent by the receiving and forwarding module, transmitting the scheduling application information to a switching card scheduling signal module, and receiving scheduling permission information from the switching card scheduling signal module, and the scheduling permission Sending information to the burst package transmitting module;

The switching card scheduling signal module receives the scheduling application information sent by the line card scheduling signal module, sends the scheduling application information to a scheduling module to request scheduling permission information from the scheduling module, and the scheduling The scheduling permission information sent by the module is sent to the line card scheduling signal module;

The scheduling module receives the scheduling application information sent by the switching card scheduling signal module, generates scheduling permission information according to the scheduling application information, and sends the scheduling permission information to the switching card scheduling signal module and the optical switching module;

The burst-encapsulated transmitting module encapsulates and converts the first data packet into a second optical signal according to the scheduling permission information, and sends the information to the optical switching module.

The optical switching module optically exchanges the second optical signal according to the scheduling permission information, and outputs a third optical signal in a burst mode.

The first data packet is encapsulated and converted into a second optical signal and sent to the optical switching module according to the scheduling permission information, and the method includes:

The burst encapsulation module encapsulates the first data packet into an optical burst according to the scheduling permission information, and sends the first data packet to the transmitting module;

In a further aspect, the embodiment of the present invention provides a data exchange system, including an optical network device, and the foregoing data switching device, where the optical network device includes: a transmitting module, configured to send the first light that carries the first data packet. The signal is sent to the data switching device, and the receiving module is configured to receive a third optical signal in a burst mode sent by the data switching device.

The optical network device further includes: a conversion module, configured to convert the third optical signal into an electrical signal, and then convert the electrical signal into a wavelength division multiplexed WDM optical signal.

The optical network device includes: a wavelength division multiplexing WDM device, or an optical transport network OTN device.

The data exchange method, device and system of the embodiment of the invention, the optical connection between the line card and the switch card, so that the optical switch module of the switch card exchanges optical signals directly at the optical layer, thereby overcoming the prior art multi-frame cascade The complex structure of the three-level multi-plane switching architecture in a router or switch cluster reduces the power consumption of the entire data switching device.

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic structural diagram of a data exchange device according to an embodiment of the present invention;

2 is a schematic flowchart of a data exchange method according to an embodiment of the present invention;

3 is a schematic structural diagram of a data exchange system according to an embodiment of the present invention;

4 is a schematic diagram 1 of a data exchange system according to an embodiment of the present invention;

FIG. 5 is a schematic diagram 2 of a data exchange system according to an embodiment of the present invention; FIG.

6 is a schematic diagram 1 of an optical switching module in a data exchange system according to an embodiment of the present invention;

7 is a schematic diagram of an output optical burst OB in a data exchange system according to an embodiment of the present invention;

8 is a second schematic diagram of an optical switching module in a data exchange system according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of outputting a continuous optical signal in a data exchange system according to an embodiment of the present invention.

Mode for carrying out the invention

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It should be noted that the “first”, “second” and “third” in the embodiments of the present invention are merely convenient for description, and do not represent the order of the sequence, the merits of the performance, and/or the priority.

As shown in FIG. 1 , an embodiment of the present invention provides a data exchange apparatus, including:

The line card 101 and the switch card 102 optically connected thereto, the line card 101 includes a receiving and forwarding module 11, a line card scheduling signal module 13, and a burst package transmitting module 12, and the switch card 102 includes a switch card scheduling signal module 14 and an optical switching module 16 And a scheduling module 15.

The receiving and forwarding module 11 is configured to receive a first optical signal that is sent by the optical network device and that carries the first data packet, convert the first optical signal into an electrical signal, and extract the first data packet and send the The burst module 12 is packaged.

The line card scheduling signal module 13 is configured to receive scheduling application information sent by the receiving and forwarding module 11, send the scheduling application information to the switching card scheduling signal module 14, and schedule a signal module from the switching card. 14 receiving scheduling permission information, and transmitting the scheduling permission information to the burst package transmitting module 12.

The switch card scheduling signal module 14 is configured to receive the scheduling application information sent by the line card scheduling signal module 13, and send the scheduling application information to the scheduling module 15 to request scheduling from the scheduling module 15. The license information and the scheduling permission information transmitted by the scheduling module 15 are transmitted to the line card scheduling signal module 13.

The scheduling module 15 is configured to receive scheduling application information sent by the switching card scheduling signal module 14, generate scheduling permission information according to the scheduling application information, and send the scheduling permission information to the switching card scheduling signal module 13 And the optical switching module 16;

The burst encapsulation transmitting module 12 is configured to encapsulate and convert the first data packet into a second optical signal and send the optical signal to the optical switching module 16 according to the scheduling permission information.

The optical switching module 16 is configured to perform optical switching on the second optical signal according to the scheduling permission information, and output a third optical signal in a burst mode.

The data exchange device can be a cluster router or a switch device. Optical network equipment including WDM (Wavelength Division) Multiplexing, wavelength division multiplexing) equipment or OTN (Optical Transport Network) equipment.

The data exchange device of the embodiment of the present invention, through the optical connection between the line card and the switch card, enables the optical switch module of the switch card to exchange at the optical layer, and directly outputs the optical signal, thereby overcoming the prior art multi-frame cascaded router or The complex structure of the three-level multi-plane switching architecture in the switch cluster reduces the power consumption of the entire data switching device.

The burst package transmitting module 12 may specifically include:

Specifically, the burst encapsulation module is specifically configured to carry the first data packet in an OB (Optical) Burst, optical burst, or an OP (Optical Packet) or at least one OC (Optical Cell).

Optionally, the line card scheduling signal module 13 includes a line card scheduling signal transceiver module, the switch card scheduling signal module 14 includes a switch card scheduling signal transceiver module, the line card scheduling signal transceiver module and the switch card scheduling The signal transceiving modules are optically connected, and the scheduling application information and the scheduling permission information are transmitted by optical signals.

Or the line card scheduling signal module 13 includes a line card scheduling signal encapsulating module and a line card scheduling signal extracting module, where the switching card scheduling signal module 14 includes a switching card scheduling signal encapsulating module and a switching card scheduling signal extracting module, And transmitting, by the second optical signal and the third optical signal, the scheduling application information and the scheduling permission information between the line card scheduling signal module and the switching card scheduling signal module:

Specifically, the receiving and forwarding module 11 may specifically include:

The receiving module is configured to receive a first optical signal that is sent by the optical network device and that carries the first data packet, convert the first optical signal into an electrical signal, and extract the first data packet and send the signal to the MAC (Media Access Control, Media Access Control) module;

The MAC module is configured to perform physical layer decoding, data link layer decoding, and link layer protocol processing on the first data packet, and send the first data packet to the NP (Network). Processor, network processor) module;

The NP module is configured to receive the first data packet, query the forwarding table information according to the source address information of the first data packet, update the destination address information of the first data packet, and send the information to the TM (Traffic) Management, traffic management) module;

Specifically, the optical switching module 16 is a rotating array waveguide grating matrix or an optical switch matrix.

As shown in FIG. 2, in accordance with the data exchange device of the foregoing embodiment, an embodiment of the present invention provides a data exchange method, including:

Step 21: The receiving and forwarding module receives the first optical signal that is sent by the optical network device and carries the first data packet, converts the first optical signal into an electrical signal, and extracts the first data packet and sends the packet to the burst. Encapsulate the transmitter module.

Step 22: The line card scheduling signal module receives the scheduling application information sent by the receiving and forwarding module, sends the scheduling application information to the switching card scheduling signal module, and receives scheduling permission information from the switching card scheduling signal module, and the Scheduling permission information is sent to the burst package transmitting module.

Step 23: The switch card scheduling signal module receives the scheduling application information sent by the line card scheduling signal module, and sends the scheduling application information to a scheduling module, to request scheduling permission information from the scheduling module, and The scheduling permission information sent by the scheduling module is sent to the line card scheduling signal module.

Step 24: The scheduling module receives the scheduling application information sent by the switching card scheduling signal module, generates scheduling permission information according to the scheduling application information, and sends the scheduling permission information to the switching card scheduling signal module and the optical switching module. ;

Step 25: The burst encapsulation transmitting module encapsulates and converts the first data packet into a second optical signal and sends the information to the optical switching module according to the scheduling permission information.

Step 26: The optical switching module performs optical switching on the second optical signal according to the scheduling permission information, and outputs a third optical signal in a burst mode.

The execution body of the data exchange method of the embodiment of the present invention may be a data exchange device. The data exchange device can be a cluster router or a switch device. Optical network devices include WDM devices or OTN devices.

The data exchange method of the embodiment of the present invention, through the optical connection between the line card and the switch card, enables the optical switch module of the switch card to exchange at the optical layer, and directly outputs the optical signal, thereby overcoming the prior art multi-frame cascaded router or The complex structure of the three-level multi-plane switching architecture in the switch cluster reduces the power consumption of the entire data switching device.

Specifically, the encapsulating and converting the first data packet into the second optical signal according to the scheduling permission information and sending the information to the optical switching module may include:

The bursting module encapsulates the first data packet into an optical burst according to the scheduling permission information, and sends the first data packet to the transmitting module;

The transmitting module receives the optical burst sent by the burst encapsulating module, and converts it into a second optical signal in a continuous mode or a burst mode and sends the optical burst to the optical switching module.

The encapsulating the first data packet into an optical burst according to the scheduling permission information includes:

The burst encapsulation module carries the first data packet in an OB (Optical) Burst, optical burst, or an OP (Optical Packet) or at least one OC (Optical Cell).

Optionally, the line card scheduling signal module and the switch card scheduling signal module transmit the scheduling application information and the scheduling permission information by using an optical connection.

Alternatively, the scheduling application information and the scheduling permission information are transmitted by the line card scheduling signal module and the switching card scheduling signal module by using the second optical signal and the third optical signal.

Specifically, the first optical signal that is sent by the receiving optical network device and carries the first data packet converts the first optical signal into an electrical signal, and the first data packet is extracted and sent to the burst package. The launch module includes:

The receiving module receives the first optical signal that is sent by the optical network device and carries the first data packet, converts the first optical signal into an electrical signal, and extracts the first data packet and sends the first data packet to the media access control MAC module. ;

The MAC module performs physical layer decoding, data link layer decoding, and link layer protocol processing on the first data packet, and sends the first data packet to the network processing NP module.

The NP module receives the first data packet, queries the forwarding table information according to the source address information of the first data packet, and updates the destination address information of the first data packet to the traffic management module.

The TM module queues the data packets received according to the scheduling permission information according to the destination address information to obtain scheduling application information, sends scheduling application information to the line card scheduling signal module, and queues the datagrams after management. The text is sent to the burst package transmitting module.

Specifically, the optical switching module is a rotating array waveguide grating matrix or an optical switch matrix.

As shown in FIG. 3, an embodiment of the present invention provides a data exchange system, including: an optical network device 31 and a data exchange device 32.

The data exchange device 32 can be understood by referring to the data exchange device of the above embodiment, and details are not described herein.

The optical network device 31 may include: a transmitting module, configured to send a first optical signal carrying the first data packet to the data switching device, and a receiving module, configured to receive the burst sent by the data switching device The third optical signal of the mode.

The transmitting module may be a transmitter, such as a continuous transmitter, for transmitting a continuous optical signal to the data switching device 32. Alternatively, the burst transmitter is configured to transmit a burst optical signal to the data switching device. The receiving module can be a burst receiver.

Optionally, the optical network device 31 may further include: a conversion module, configured to convert the third optical signal into an electrical signal, and then convert the electrical signal into a wavelength division multiplexed WDM optical signal.

The optical network device may be a wavelength division multiplexing WDM device or an optical transport network OTN device.

In the data exchange system of the embodiment of the present invention, the optical switch between the line card and the switch card enables the optical switch module of the switch card to exchange at the optical layer to directly output the optical signal, thereby overcoming the prior art multi-frame cascaded router or The complex structure of the three-level multi-plane switching architecture in the switch cluster reduces the power consumption of the entire data switching device.

As shown in FIG. 4, an embodiment of the present invention provides a first schematic diagram of a data exchange system, including: a data switching device and an optical network device. The data exchange device may be a router switch, and the optical network device may be a WDM device or an OTN device.

Here, a brief description: the data communication network is mainly composed of routers or switches, and the transmission network is mainly composed of WDM or OTN devices. There is no actual fiber direct connection between the router or switch. There is an actual fiber connection between the WDM or OTN device, but there is an actual fiber connection between the router or switch and the WDM or OTN device. Under normal circumstances, directly connected routers or switching and WDM or OTN devices are placed at one site, so the fibers connected between them are short, and are connected by short-range optical modules (also commonly referred to as gray ports); The connection fibers between WDM or OTN devices are generally long-distance, so they are usually interconnected by long-distance optical modules (blocks are generally called color ports). For routers or switches, the side that interfaces with WDM or OTN is called the network side; for WDM or OTN devices, the side that interfaces with the router is called the client side, and the side that is connected between WDM or OTN devices Called the line side. It should be noted that if the distance is relatively close, the gray port is directly connected between the router or the switch, and there is no need to transmit the network at this time. This type of application is generally referred to as a router or switch fiber direct connection.

The data exchange device in the embodiment of the present invention is a router 41. The optical network device in the embodiment of the present invention is a WDM device 42. The router 41 of the embodiment of the present invention includes a line card 411 and a switch card 412. One line card can be set in one line card frame, or multiple line cards can be placed in one line card frame. The switch card can be placed in the exchange box. The line card 411 includes a receiving module 4111, a MAC module 4112, an NP module 4113, a TM module 4114, a burst packing module 4115, a transmitting module 4116, and a line card scheduling signal transceiver module 4117. The switch card 412 includes an optical switch module 4121, a scheduler module 4122, and a switch card scheduling signal transceiver module 4123.

The WDM device 42 of the embodiment of the present invention includes a continuous transmitter 421 and a burst receiver 422. The continuous transmitter 421 transmits a continuous optical signal to the router 41 of the embodiment of the present invention. Alternatively, the continuous transmitter can be replaced with a burst transmitter to transmit a burst optical signal to the router 41 of the embodiment of the present invention. The burst receiver 422 receives the burst optical signal from the router 41 of the embodiment of the present invention.

Specifically, the receiving module 4111 is a continuous receiver, and the continuous receiver receives the continuous optical signal sent by the WDM device, converts it into an electrical signal, and sends it to the MAC (Media Access Control, Media Access Control) module 4112.

The MAC module 4112 is configured to: receive electrical signals sent by the continuous receiver, perform physical layer and data link layer processing, including physical layer decoding, data link layer decoding, and link layer protocol processing (eg, status, dual Work mode, flow control, speed, etc.), message check and statistics, etc. The MAC module sends the processed data to the NP (Network). Processor, Network Processor) module 4113.

The NP module 4113 receives the data sent by the MAC module, and mainly performs three layers of processing, such as classification and route lookup. Lookup), Forwarding, Header Modification (Header) Modification), segmentation and reassembly of data units, and so on. The NP module sends the processed data to the TM (Traffic) Management, Traffic Management Module 4114.

The TM module 4114 receives the data sent by the NP module, and performs traffic management according to the scheduling permission information sent by the scheduling signal transceiver module, for example, metering, traffic shaping, traffic policing, and queuing. (Queueing), scheduling, plane separation and combination, etc., the processed data is sent to the burst encapsulation module 4115, and the scheduling application information is sent to the line card scheduling signal transceiver module 4117.

The scheduling permission information may allow the cells of each queue in the TM module to be sent to the identifier of the burst encapsulation module.

The burst encapsulation module 4115 receives the data sent by the TM module 4114, and performs processing on the physical layer and the data link layer according to the scheduling permission information sent by the line card scheduling signal transceiver module 4117, including the link layer protocol processing and chain. The layer address update, link layer coding, physical layer coding, and the like, and the processed data is encapsulated into bursts and sent to the transmitting module 4116.

Wherein, at least one IP packet or Ethernet packet is encapsulated by one OB.

Alternatively, an OP encapsulates an IP or Ethernet packet.

Alternatively, multiple OCs encapsulate one IP packet or Ethernet packet. For IP packets or The Ethernet packet is sliced and encapsulated into optical cells.

The transmitting module 4116 is a transmitter, and the transmitter receives the burst sent by the burst encapsulation module 4115, and converts it into an optical signal and sends it to the optical switching module 4121 in a continuous mode or a burst mode.

The transmitting module may send an optical signal in a continuous mode or an optical signal in a burst mode. Here, the continuous mode optical signal and the burst mode optical signal are briefly described: the burst mode optical signal carries a plurality of valid data units, there is no data between the valid data units, and the continuous mode optical signal carries multiple A valid data unit with fixed padding data between the valid data units.

The transmitter is specifically a wavelength fast adjustable transmission module that transmits a burst mode optical signal. For example: Fast Tunable Laser (Fast Tunable Laser; referred to as FTL.

The transmitter is specifically Tx (Transmitter) and transmits a continuous mode optical signal.

The line card scheduling signal transceiver module 4117 receives the optical signal containing the scheduling permission information sent by the switching card scheduling signal transceiver module 4123, converts it into an electrical signal, and extracts the scheduling permission information, and sends the scheduling permission information to the burst encapsulation module 4115 and the TM module. 4114; The scheduling application information sent by the TM module 4114 is converted into an optical signal, and sent to the switching card scheduling signal transceiver module 4123.

The optical switching module 4121 receives the optical signal sent by the at least one transmitter 4116, exchanges the scheduling permission information sent by the scheduler module 4122, and transmits the optical burst signal generated after the switching to the burst receiver. 422.

Among them, optical switching is performed in units of one OB.

Alternatively, an OP performs light exchange for the unit.

Alternatively, one OC is used for optical switching.

The plurality of input dashed arrows of the optical switching module indicate a scheduling signal transceiver module that can connect multiple switching frames, and the plurality of output dotted arrows of the optical switching module indicate burst receivers that can connect multiple WDM devices.

The optical switching module is specifically a rotating array waveguide grating matrix (Cyclic Arrayed Waveguide) Grating; hereinafter referred to as CAWG).

The scheduler module 4122 receives the scheduling application information sent by the at least one switching card scheduling signal transceiver module 4123, and outputs scheduling permission information according to a preset scheduling algorithm, and sends the scheduling permission information to the optical switching module 4121 and the switching card scheduling signal transceiver module 4123. The plurality of input and output bidirectional arrows of the scheduler module 4122 indicate a switch card scheduling signal transceiver module that can connect a plurality of switch frames.

Among them, there are many scheduling algorithms that can be set in advance, such as PIM (Parallel Iterative Matching, Parallel iterative matching algorithm) or iSLIP (Iterative Serial Line Interface).

The switch card scheduling signal transceiver module 4123 converts the scheduling permission information sent by the scheduler module 4122 into an optical signal, and sends it to the line card scheduling signal transceiver module 4117; the received line card scheduling signal transceiver module 4117 sends the scheduling application information. The optical signal is converted into an electrical signal, and the scheduling application information is extracted and sent to the scheduler module 4122.

Optionally, the TM module or the burst encapsulation module may include a cache, and the IP packet may be cached according to a multi-queue manner, such as VOQ (Virtual Output). Queuing, virtual output queue) Cache IP packets to solve the problem of queue blocking.

The embodiment of the present invention provides a data exchange system. The optical switch between the line card and the switch card enables the optical switch module of the switch card to exchange optical signals and directly output optical signals, thereby overcoming the prior art multi-frame cascaded router or The complex structure of the three-level multi-plane switching architecture in the switch cluster reduces the power consumption of the entire data switching device.

Moreover, the embodiment of the present invention provides a data exchange system. The backplane is generally located between the transmitter and the optical switch module (so-called optical backplane), and the optical connection between the line card and the switch card, the line card frame and the board in the switch frame. There is no high-speed electrical signal connection between them, which reduces the requirement of backplane interconnection, simplifies the hardware design difficulty, and reduces the hardware design cost.

As shown in FIG. 5, an embodiment of the present invention provides a second schematic diagram of a data exchange system. The data exchange system of the embodiment of the present invention differs from the data exchange system shown in FIG. 4 in that:

The line card scheduling signal module comprises a line card scheduling signal encapsulation module and a line card scheduling signal extraction module, and the switch card scheduling signal module comprises a switching card scheduling signal encapsulation module and a switching card scheduling signal extraction module.

The scheduling permission information and the scheduling application information are transmitted and received by using a separate scheduling signal transceiver module. For example, the scheduling permission information and the scheduling application information may select a specific OB for transmission and reception.

Specifically, the data exchange device in the embodiment of the present invention is the router 51. The optical network device in the embodiment of the present invention is the WDM device 52. The router 51 of the embodiment of the present invention includes a line card 511 and a switch card 512. One line card can be set in one line card frame, or multiple line cards can be placed in one line card frame. The switch card can be placed in the exchange box. The line card 511 includes a receiving module 5111, a MAC module 5112, an NP module 5113, a TM module 5114, a burst packing module 5115, a transmitting module 5116, a line card scheduling signal encapsulating module 5117, and a line card scheduling signal extracting module 5118. The switch card 512 includes an optical switch module 5121, a scheduler module 5122, a switch card scheduling signal encapsulation module 5123, and a switch card scheduling signal extraction module 5124.

The WDM device 52 of the embodiment of the present invention includes a continuous transmitter 521 and a burst receiver 522.

The receiving module 5111 is a continuous receiver, and the continuous receiver receives the continuous optical signal sent by the WDM device, converts it into an electrical signal, and sends it to the MAC module 5112.

The MAC module 5112 is configured to: receive electrical signals sent by the continuous receiver, perform physical layer and data link layer processing, including physical layer decoding, data link layer decoding, and link layer protocol processing (eg, status, dual Work mode, flow control, speed, etc.), message check and statistics, etc. The MAC module sends the processed data to the NP module 5113.

The NP module 5113 receives the data sent by the MAC module, and mainly performs three layers of processing, such as classification, route lookup, forwarding, header modification, segmentation and reassembly of the data unit, and the like. The NP module sends the processed data to the TM module 5114.

The TM module 5114 receives the data sent by the NP module, and performs scheduling management according to the scheduling permission information sent by the line card frame scheduling signal extraction module, for example, traffic metric, traffic shaping, traffic policing, queuing, scheduling, etc. The processed data is sent to the burst encapsulation module 5115, and the scheduling application information is sent to the line card scheduling signal encapsulation module 5117.

The line card scheduling signal encapsulating module 5117 encapsulates the scheduling application information sent by the TM module 5114 into a specific OB and sends it to the burst encapsulation module 5115.

The burst encapsulation module 5115 receives the data sent by the TM module 5114, and performs processing on the physical layer and the data link layer according to the scheduling permission information sent by the line card scheduling signal extraction module 5118, including the link layer protocol processing and chain. The layer address is updated, the link layer is encoded, the physical layer is encoded, and the like, and the processed data is encapsulated into an OB, and the specific OB sent by the scheduling signal encapsulation module is incorporated, and the transmitting module 5116 is sent together.

The transmitting module 5116 is a transmitter, and the transmitter receives the burst sent by the burst encapsulation module 5115, and converts it into an optical signal and sends it to the optical switching module 5121 in a continuous mode or a burst mode.

The line card scheduling signal extraction module 5118 receives the OB sent by the optical switching module 5121, extracts a specific OB, converts it into an electrical signal, extracts scheduling permission information and sends it to the TM module 5114, and stores the remaining OBs carrying the service data. It is sent to the burst receiver 522.

The optical switching module 5121 receives the OB sent by the at least one transmitter 5116, and extracts the specific OB carrying the scheduling application information and sends the OB to the at least one switching card scheduling signal extraction module 5124. The scheduling permission information sent by the scheduler module 5122 is in the light. The layer exchanges and merges the scheduling permission information sent by the at least one switch card scheduling signal encapsulating module 5123 to the at least one line card scheduling signal extraction module 5118.

The plurality of input dashed arrows of the optical switching module 5121 indicate that a plurality of transmitting modules 5116 can be connected, and the plurality of output dotted arrows of the optical switching module indicate the burst receiver 520 that can connect multiple WDM devices.

The switch card scheduling signal extraction module 5124 receives the specific OB carried by the optical switching module 5121 and carries the scheduling application information, converts it into an electrical signal, and extracts the scheduling application information therefrom, and sends it to the scheduler module 5122.

The scheduler module 5122 receives the scheduling application information from the at least one switching card scheduling signal extraction module 5123, and outputs scheduling permission information to the optical switching module 5121 and the at least one switching card scheduling signal encapsulating module 5123 according to a preset scheduling algorithm.

The switch card scheduling signal encapsulating module 5123 receives the scheduling grant information sent by the scheduler module 5122, and encapsulates it into a specific OB, and converts the optical signal into an optical switching module 5121.

Other parts can be understood by referring to the data exchange system shown in FIG. 4 above, and details are not described herein.

Alternatively, the embodiment of the present invention provides a data exchange system (not shown in the drawing), which is different from the data exchange system shown in FIG. 4 and FIG. 5 in that the router in the data exchange system shown in FIG. 4 and FIG. The optical fiber connection between the WDM device and the WDM device, and the optical fiber direct connection network between the router and the router in the data exchange system of the embodiment of the present invention, that is, the WDM device in FIG. 4 and FIG. 5 can be replaced by a router. In this case, the line card frame is connected from the network. The side receiving may also be a burst mode optical signal (OB). Other parts can be understood by referring to the data exchange system shown in FIG. 4 and FIG. 5 above, and details are not described herein.

As shown in FIG. 6, the optical switch module in the data exchange system of the embodiment of the present invention has a schematic diagram, and the optical switch module is CAWG (Cyclic). Arrayed Waveguide Grating, matrix of rotating arrayed waveguide gratings.

Figure 6, FTL (Fast Tunable Laser, fast tunable laser) is the transmit module of the line card frame, and BMR (Burst Mode Receiver) is the burst receiver module of the WDM device.

The FTL sends the OBs at the selected wavelengths. After passing through the CAWG, the OBs are output at a specific output port (BMR), and each OB encapsulates at least one Ethernet packet.

The FTL issues OBs, which are fixed lengths, and maintain a fixed phase relationship between different OBs, which simplifies the scheduling algorithm. Optionally, the OB may be variable length, and different OBs may not need to maintain a fixed phase relationship, so the scheduling algorithm may be complicated.

As shown in Fig. 6, m denotes the number of rows and columns of optical switching, and n denotes the number of rows and columns indicating the CAWG.

As shown in FIG. 7, the optical burst OB is outputted. The FTL issues an OB, and the OB is a fixed length. The length of an OB plus the interval between the OBs is one scheduling period.

As shown in FIG. 8 , in the data exchange system of the embodiment of the present invention, the optical switch module is an optical switch matrix, that is, a multi-level optical switch matrix is used to construct a large-capacity optical switch network.

Tx (Transmitter) is the transmitting module of the line card frame, BMR (Burst Mode) Receiver) is the burst receiver module of the WDM device. Tx can issue OBs, exchange them with a multi-level optical switch matrix, and send them to the corresponding output port (BMR).

As shown in Fig. 8, m denotes the number of rows and columns of optical switching, and n denotes the number of rows and columns indicating optical switching.

As shown in FIG. 9, a schematic diagram of outputting a continuous optical signal, Tx can output a continuous mode optical signal, and a specific implementation of outputting a continuous mode optical signal is to fill a fixed pattern between OBs to form a continuous mode signal. After the optical signal of the continuous mode is exchanged by the multi-stage optical switch, the optical burst signal (OB) is still sent to the corresponding output port.

One of ordinary skill in the art can understand that all or part of the process of implementing the foregoing embodiments can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. When executed, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, or a read-only storage memory (Read-Only) Memory, ROM) or Random Access Memory (RAM).

Claims

A data exchange device, comprising: a line card and a switch card optically connected thereto, the line card comprising a receiving and forwarding module, a line card scheduling signal module and a burst package transmitting module, wherein the switching card comprises a switching card scheduling Signal module, optical switching module and scheduling module:

The receiving and forwarding module is configured to receive a first optical signal that is sent by the optical network device and that carries the first data packet, convert the first optical signal into an electrical signal, and extract the first data packet and send the The burst package transmitting module;

The line card scheduling signal module is configured to receive scheduling application information sent by the receiving and forwarding module, send the scheduling application information to the switching card scheduling signal module, and receive a scheduling permission from the switching card scheduling signal module. Information, and sending the scheduling permission information to the burst package transmitting module;

The switching card scheduling signal module is configured to receive the scheduling application information sent by the line card scheduling signal module, send the scheduling application information to the scheduling module, to request scheduling permission information from the scheduling module, and Transmitting the scheduling permission information sent by the scheduling module to the line card scheduling signal module;

The scheduling module is configured to receive scheduling application information sent by the switching card scheduling signal module, generate scheduling permission information according to the scheduling application information, and send the scheduling permission information to the switching card scheduling signal module and the Optical switching module

The burst-encapsulated transmitting module is configured to encapsulate and convert the first data packet into a second optical signal according to the scheduling permission information, and send the signal to the optical switching module.

The optical switching module is configured to perform optical switching on the second optical signal according to the scheduling permission information, and output a third optical signal in a burst mode.
The data exchange device according to claim 1, wherein the burst package transmitting module comprises:

a burst encapsulation module, configured to encapsulate the first data packet into an optical burst according to the scheduling permission information, and send the data packet to a transmitting module;

And a transmitting module, configured to receive the optical burst sent by the burst encapsulating module, and convert it into a second optical signal in a continuous mode or a burst mode and send the optical burst to the optical switching module.
The data switching device according to claim 1 or 2, wherein the burst encapsulation module is configured to carry the first data packet in an optical burst OB or an optical packet OP or At least one optical cell OC.
The data exchange device according to any one of claims 1 to 3, wherein the line card scheduling signal module comprises a line card scheduling signal transceiver module, and the switch card scheduling signal module comprises a switching card scheduling signal transceiver module. The line card scheduling signal transceiver module and the switch card scheduling signal transceiver module are optically connected, and the scheduling application information and the scheduling permission information are transmitted by using an optical signal.
The data exchange device according to any one of claims 1 to 3, wherein the line card scheduling signal module comprises a line card scheduling signal encapsulation module and a line card scheduling signal extraction module, and the switch card scheduling signal module comprises a switching card scheduling signal encapsulating module and a switching card scheduling signal extracting module, wherein the line card scheduling signal module and the switching card scheduling signal module transmit the scheduling by using the second optical signal and the third optical signal Application information and the scheduling permission information;

The line card scheduling signal encapsulating module is configured to receive the scheduling application information sent by the receiving and forwarding module, and package the scheduling application information into a first optical burst and send the information to the burst encapsulation transmitting module;

The burst-embedded transmitting module is further configured to package the first optical burst with the burst encapsulated by the first data packet and convert the second optical signal into a second optical signal and send the optical signal to the optical switching module.

The optical switching module is further configured to extract the first optical burst from the first optical burst and the burst encapsulated by the first data packet, and send the signal to the switch card for scheduling signal extraction. Module

The switching card scheduling signal extraction module is configured to extract the scheduling application information from the first optical burst, and send the scheduling application information to the scheduling module, where the scheduling module applies according to the scheduling The information generates scheduling permission information and sends the scheduling information to the switch card scheduling module;

The switching card scheduling signal encapsulating module is configured to receive scheduling permission information sent by the scheduling module, and the scheduling permission information is loaded into a second optical burst and sent to the optical switching module;

The optical switching module is further configured to convert, by the second optical burst sent by the switch card scheduling signal encapsulating module, with the optical burst encapsulated by the first data packet, into an optical signal, and send the optical signal to the line card. Scheduling signal extraction module;

The line card scheduling signal extraction module is configured to receive an optical signal sent by the optical switching module, extract the second optical burst, extract the scheduling permission information, and send the scheduling permission information to the The burst encapsulated transmitting module, and the optical burst encapsulated by the first data packet are sent to the optical network device.
The data exchange device according to any one of claims 1-5, wherein the receiving and forwarding module comprises:

a receiving module, configured to receive a first optical signal that is sent by the optical network device and that carries the first data packet, convert the first optical signal into an electrical signal, and extract the first data packet and send the information to the media access Control the MAC module;

a MAC module, configured to perform physical layer decoding, data link layer decoding, and link layer protocol processing on the first data packet, and send the first data packet to a network processing NP module;

The NP module is configured to receive the first data packet, query the forwarding table information according to the source address information of the first data packet, and update the destination address information of the first data packet and send the information to the traffic management module. ;

a TM module, configured to perform queuing management on the received data packet according to the scheduling permission information according to the destination address information to obtain scheduling application information, send scheduling application information to the line card scheduling signal module, and after queuing management The data message is sent to the burst package transmitting module.
The data exchange device according to claim 6, wherein the source address information and the destination address information comprise: a media access control MAC destination address and a source address, and/or a multi-protocol label switching MPLS outgoing label and an incoming label. And/or Internet Protocol IP destination address and source address;

The forwarding table information includes a correspondence between the MAC destination address and the source address, and/or a correspondence between the MPLS outgoing label and the incoming label, and/or a correspondence between the IP destination address and the source address.
The data exchange device according to any one of claims 1-7, wherein the optical switching module is a rotating arrayed waveguide grating matrix or an optical switch matrix.
A data exchange method, comprising:

The receiving and forwarding module receives the first optical signal that is sent by the optical network device and carries the first data packet, converts the first optical signal into an electrical signal, and extracts the first data packet and sends the first data packet to the burst package transmitting module. ;

The line card scheduling signal module receives scheduling application information sent by the receiving and forwarding module, sends the scheduling application information to the switching card scheduling signal module, and receives scheduling permission information from the switching card scheduling signal module, and the scheduling permission information Sending to the burst package transmitting module;

The switching card scheduling signal module receives the scheduling application information sent by the line card scheduling signal module, sends the scheduling application information to a scheduling module to request scheduling permission information from the scheduling module, and the scheduling module The sent scheduling permission information is sent to the line card scheduling signal module;

The scheduling module receives the scheduling application information sent by the switching card scheduling signal module, generates scheduling permission information according to the scheduling application information, and sends the scheduling permission information to the switching card scheduling signal module and the optical switching module;

The burst-encapsulation transmitting module encapsulates and converts the first data packet into a second optical signal according to the scheduling permission information, and sends the first data packet to the optical switching module.

The optical switching module optically exchanges the second optical signal according to the scheduling permission information, and outputs a third optical signal in a burst mode.
The data exchange method according to claim 9, wherein the encapsulating and converting the first data packet into the second optical signal according to the scheduling permission information and transmitting the information to the optical switching module comprises:

The bursting module encapsulates the first data packet into an optical burst according to the scheduling permission information, and sends the first data packet to the transmitting module;

The transmitting module receives the optical burst sent by the burst encapsulating module, and converts it into a second optical signal in a continuous mode or a burst mode and sends the optical burst to the optical switching module.
A data exchange system, comprising: an optical network device, and the data switching device according to any one of claims 1-8, wherein the optical network device comprises: a transmitting module, configured to send and carry a first datagram The first optical signal of the text is sent to the data switching device, and the receiving module is configured to receive the third optical signal of the burst mode sent by the data switching device.
The data exchange system according to claim 11, wherein the optical network device further comprises: a conversion module, configured to convert the third optical signal into an electrical signal, and then convert the electrical signal into wavelength division multiplexing WDM optical signal.
The data exchange system according to claim 11, wherein the optical network device comprises: a wavelength division multiplexing WDM device, or an optical transport network OTN device.