CN1134956C - Adaption method for integrating internet with wave length division multiplexing system - Google Patents

Abstract

The present invention relates to an adaptation method for integrating an internet with a wavelength division multiplexing system. Aiming at overcoming the disadvantages that an IP over WDMs of a kernel layer and a marginal layer has no standard support, the processing of a hardware forwarding part has much expenses, optical packet switching has much expenses, a value of a retransmission timer is not clearly defined, the efficiency is low because of the filling function, etc. in the prior art, the present invention proposes a method for substituting two factors of a 'point to point protocol' and a 'high-level data chain procedure' by one factor of a WDM link access procedure to solve integration and adaptation between an internet protocol and a wavelength division multiplexing system. The method simultaneously supports the fourth edition and the sixth edition of an internet protocol.

Description

A kind of adaptation method that is used for internet and the fusion of wavelength division multiplexing system

Technical field

The data that the present invention relates to internet transmit the field, it is a kind of adaptation method that is used for internet and wavelength division multiplexing system (english abbreviation WDM) fusion, be mainly used in the core switch router, the edge switch router, based on the high low-end switch of packet switch, user side integrated access equipment and interconnecting and interworking equipment relevant etc. with internet.

Background technology

According to the interrelated data introduction, now be used for the adaptation method that internet and wavelength division multiplexing system merge, be to adopt " point-to-point protocol " (english abbreviation PPP) to add " high-level data link rules " (english abbreviation HDLC).At internet engineering duty group (english abbreviation IETF), it is defined as (code name) RFC1619 (RFC is the request comment, English Request For Comments).As everyone knows, popularization and application along with computer, the network transmission technology supporting with computer constantly develops, with the internet be the computer network of representative by the wavelength division multiplexing system constantly to extending all over the world, allow electronic information propagate, make electronic information reach each corner in the world by wireless and microwave transmission mode simultaneously with the fastest speed.Along with the day by day increase of electronic information by transmission volume, the quality of electronic information transmission becomes the problem that people pay close attention to day by day.Internet has the unified IP delivery platform in the world, can move countless application and business thereon.Wavelength division multiplexing system (english abbreviation WDM) is that at present best in the world and existing telecommunications transmits one of net resource, and both have extremely strong complementarity, are containing several hundred billion dollars market prospects.Internet protocol (english abbreviation IP) is directly at WDM optical cable online operation, is countries in the world in recent years, each big telecommunications manufacturer, the focus of operator and each computation machine company market contention. and also be the key point that telecommunications network and computer network merge.Safety, fast, high-quality is by internet and other Network Transmission electronic information, need to adopt corresponding transmission means and adaptation method, not smooth to prevent Network Transmission, information dropout, according to the interrelated data introduction, now be used for the adaptation method that internet and wavelength division multiplexing system merge, present " point-to-point protocol " (english abbreviation PPP) that adopts, it can encapsulate 30 multiple network agreements, contain and be useful on internet " internet protocol the 4th edition (English IPV4); this protocol fitting method is successful by the MODEM online; also have fire compartment wall, but if be used for wavelength division multiplexing system (english abbreviation WDM), just comes with some shortcomings and defective.Mainly show:

(1) application that transmits on WDM for IP does not have the standard support, causes IP over WDM can not be used for internet marginal layer and core layer;

(2) for per second 2.5G gigabit and above speed thereof, hardware forwarding part expense is too big during development equipment, being used for " internet protocol (english abbreviation IP) is directly at wavelength division multiplexing optical cable net (english abbreviation IP over WDM) " goes up when moving, all the more so, because the RFC1619 regulation: recommend to use " LCP (english abbreviation LCP) " and magic number (English is expressed as Magic Number).These two more complicated;

When (3) adopting RFC1619, because PPP need connect, the default value of retransmission timer is decided to be 3 seconds in PPP.For high-speed link, this method is too blunt.Use for concrete engineering, should require to support speed range all (differing from 4032 times approximately) from per second 2 megabits to per second 10000 megabits.So the value of retransmission timer should be determined according to the time delay that circuit comes and goes.These are not all made stipulations in RFC 1619, thereby uncertainty can occur when the apparatus interconnection of different manufacturers;

(4) fill function (English is expressed as Padding Function), the information field of PPP generally will be filled into maximum receive unit (english abbreviation MRU, general provision is 1500 bytes on internet).For general internet packet, as the application of browser (English is expressed as WWW) online (this kind application account for 75% that whole internet uses), the average data packet length is 330 bytes, has average about 350% to be to flog a dead horse like this, and efficient is very low.In addition, it is information field that this filling field also needs a function which is distinguished at receiving terminal, and which is to fill field.This has increased processing expenditure again;

(5) the whole rules of LCP (english abbreviation LCP) comprise 10 kinds of configuration data bags (English is expressed as configurationpacket), 16 kinds of state events (English is expressed as Event) and 12 kinds of actions (English is expressed as Action), and the packet switch (light---light) that these complicated mechanism is used for light is to be difficult to realize.Even worked it out, cost is high too.

Summary of the invention

The objective of the invention is, improved, and propose and design the various situations that are applicable to, a kind of adaptation method that is used for internet and the fusion of wavelength division multiplexing system at deficiency and defective that prior art exists; Conception of the present invention is only to keep bit-oriented WDM Link Access Procedure (english abbreviation LAPW) between internet protocol (english abbreviation IP) and wavelength division multiplexing system (english abbreviation WDM), replace address field with many service access points, the encapsulation of realization multi-protocols, can support whole speed ranges of from the Lower Order Virtual Container to the higher order virtual container, (comprising cascade), also be particularly suitable for using the packet switch interface of light, uncertainty without any agreement, this conception can not only solve new equipment development and problems of operation, and has found an extraordinary outlet for the existing telecommunication transmission resource that exceeds 100 billion of China.

The technical solution of this invention is, adopts a kind of adaptation method that internet and wavelength division multiplexing system merge that is used for, and comprises the following steps:

Receive packet from the network layer device of internet, the type of recognition data bag, the type generation SAPI identifier according to identification converts packet to first kind frame and reflects the professional code-point of the segmentation that sends priority; Described first kind frame is packaged into the frame format of address field, the control field that comprises beginning flag, contains the SAPI identifier, the information field that comprises described packet, Frame Check Sequence field and termination flag, forms the second class frame; The described second class frame is encapsulated into payload part, and inserts corresponding expense, add A1 and the A2 byte of similar SDH, form the 3rd class frame; With described the 3rd class frame with the transmission priority mapping segmenting professional code-point and reflected to the optical channel layer of WDM.

Aforesaid adaptation method, the beginning flag of the described second class frame and termination flag are " 0x7E ".

Aforesaid adaptation method, the value of the control field of the described second class frame are " 0x03 ".

Aforesaid adaptation method also comprises calculation procedure, utilizes generator polynomial 1+x+x ²+ x ⁴+ x ⁵+ x ⁷+ x ⁸+ x ¹⁰+ x ¹¹+ x ¹²+ x ¹⁶+ x ²²+ x ²³+ x ²⁶+ x ³², the second class frame all bits except that beginning flag, termination flag and Frame Check Sequence field are carried out verification, detect frame and in transmission course, whether go wrong.

Aforesaid adaptation method, for the second class frame, the termination flag of former frame is the beginning flag of adjacent frame subsequently.

Aforesaid adaptation method can send one or more continuous byte of paddings between the second class frame.

Aforesaid adaptation method, the network layer IP packet that described first kind frame is an internet, the described second class frame are WDM Link Access Procedure (LAPW) frames, described the 3rd class frame is an optical channel layer frame.

Aforesaid adaptation method, described network layer IP packet are Ipv4 or Ipv6 data message.

Aforesaid adaptation method, the largest passages number of optical link system can be 4,8,16,32,64....., and channel type is:

Its bandwidth 622080 kilobits/second of STM-4/STM-4c (or OC-12/OC-12c)

Its bandwidth 2488320 kilobits/second of STM-16/STM-16c (or OC-48/OC-48c)

Its bandwidth 9953280 kilobits/second of STM-64/STM-64c (or OC-192/OC-192c) advantage of the present invention with respect to existing RFC1619, has following innovation:

(1) at present more external manufacturers (are RFC1619 according to the PPP over WDM that internet engineering duty group (english abbreviation IETF) proposes, SONET is meant the Synchronous Optical Network of North America) exploitation, with regard to RFC 1619 itself, link layer has PPP (point-to-point protocol) and two kinds of agreements of HDLC (high-level data link rules), more complicated, hardware spending was too big when it was used for the above speed of per second 2.5 gigabits, the present invention only adopts a LAPW key element by contrast, its complexity and HDLC are suitable, saved " LCP (english abbreviation LCP) " and magic number (English the is expressed as Magic Number) mechanism of the complexity among the PPP, the expense of used protocol adaptation reduces greatly;

(2) RFC 1619 does not still support WDM to transmit the application of IP at present, does not have the standard support when application of PPP over SONET/SDH is to Internet marginal layer and core layer like this, and the present invention can support by contrast, and is both simple, complete again;

When (3) adopting RFC1619, because PPP need connect, the default value of retransmission timer is decided to be 3 seconds in PPP. for high-speed link, too blunt, use for concrete engineering, should require all to support to the speed range of per second 10000 megabits from per second 2 megabits, so the value of retransmission timer should be determined according to the time delay that circuit comes and goes, these are not all made stipulations in RFC 1619, thereby when the apparatus interconnection of different manufacturers uncertainty may appear, the present invention adopts and does not confirm formula information transfer service mode by contrast, do not need to connect, also do not need to use retransmission timer, the uncertainty of communicating by letter between any peer-entities can not occur, the application of the speed range from per second 2 megabits to per second 10000 megabits is all supported;

(4) about filling the use of function, the information field of PPP generally will be filled into maximum receive unit (english abbreviation MRU, general provision is 1500 bytes on internet), for general internet packet, as the application of browser (English is expressed as WWW) online (this kind application account for 75% that whole internet uses), packet length is average out to 330 bytes, and average like this having an appointment 350% is to flog a dead horse, and efficient is very low; In addition, it is information field that this filling field also needs a function which is distinguished at receiving terminal, and which is to fill field, and this has increased processing expenditure again, and the present invention is irrelevant with the filling function by contrast, for any internet application, does not have this idle work;

(5) the whole rules of LCP comprise 10 kinds of configuration data bags (English is expressed as configuration packet), 16 kinds of state events (English is expressed as Event), 12 kinds of actions (English is expressed as Action), the packet switch (light---light) that these complicated mechanism is used for light is to be difficult to realize.Even worked it out, cost is high too.By contrast, the present invention does not have these configuration data bags, and state event and action can be used for the packet switch (light---light) of light at an easy rate;

(6) the present invention has considered Ipv4 that is using at present and the Ipv6 that is about to use, supports to have good real world applications characteristics and extensibility in the future with unified LAPW mechanism;

Generally, the present invention is with very letter refining, mode with cheapness solves the protocol adaptation of internet to the WDM telecommunication transmission efficiently, " point-to-point protocol (english abbreviation PPP) and two key elements of high-level data chain rules (english abbreviation HDLC) are supported internet protocol the 4th edition (english abbreviation Ipv4) and the application of internet protocol sixth version (english abbreviation Ipv6) on WDM with key element replacement of WDM Link Access Procedure.

Description of drawings

Fig. 1, conception schematic diagram proposed by the invention

Fig. 2, the protocol stack arrangement example schematic of networking of the present invention

Fig. 3, the UNE of internet protocol proposed by the invention and wavelength division multiplexing system WDM are for example

Fig. 4, network layer proposed by the invention, the primitive graph of a relation between link layer and the physical layer

Fig. 5, the present invention uses conception figure in national IP over SDH/WDM core layer networking

Fig. 6, the present invention is in IP over SDH/WDM core layer networking application conception inside the province

EmbodimentBelow, embodiments of the invention are described with reference to the accompanying drawings.

Imagination proposed by the invention is mainly used in the core switch router, the edge switch router, and based on the high low-end switch of packet switch, user side integrated access equipment and interconnecting and interworking equipment relevant etc. with internet.Application framework of the present invention is seen Fig. 1, it is conception schematic diagram proposed by the invention, wherein IPv6 represents the internet protocol sixth version, IPv4 represents internet protocol the 4th edition, SAPI represents the service access point identifier, and network layer adopts internet protocol (IP) (comprising Ipv4 and IPv6), and link layer adopts WDM Link Access Procedure (english abbreviation LAPW), physical layer adopts wavelength division multiplexing system (WDM), mainly comprises all kinds of high-orders and Lower Order Virtual Container.In this framework, the 3rd layer of service access point that provides of the 2nd course has two, respectively for using based on the packet of IPV4 with based on the packet of IPV6.Their service access point identifier (SAPI) is respectively a decimal number " 4 " and " 6 ".Whole protocol Data Unit in the layer 3 IP bag (english abbreviation PDU), " version field " (English Version), professional (the English Differentiated Services) code-point of segmentation or IPv4 business type field (english abbreviation TOS), when sending as 2 layers of the parameter maps to the of primitive.At the 2nd layer, the information field of the PDU that shines upon as LAPW; The version field of shining upon as service access point identifier (english abbreviation SAPI), and is transferred to the address field of LAPW; The professional code-point of the segmentation of shining upon or IPv4 business type field as a kind of foundation, control formation algorithm.Do not confirm formula information transfer service (UITS) the 2nd layer of employing, it and the 1st layer are also mutual with primitive and parameter by corresponding service access point.The protocol stack arrangement example schematic of Fig. 2 networking of the present invention, it is expressed (gigabit) local area network (LAN) and inserts the inlet side of IP over WDM net and the protocol stack arrangement that goes out to hold each node of gateway, LLC presentation logic controlling links sublayer wherein, MAC represents MAC sublayer, SDH represents the wavelength division multiplexing system, LAN represents (gigabit) local area network (LAN), IPv4 represents internet protocol the 4th edition, IPv6 represents the internet protocol sixth version, TCP represents transmission control protocol, UDP represents User Datagram Protoco (UDP), IP represents internet protocol (general address), and the fusion of " IP over WDM " expression internet protocol and wavelength division multiplexing system is at the gateway place, be furnished with SDH and MAC two class physical interfaces simultaneously, and that network layer remains Ipv4/Ipv6 is constant.Fig. 3 be internet protocol proposed by the invention and wavelength division multiplexing system SDH UNE for example, wherein, solid line represents to adopt between the node wavelength division multiplexing system physical connection, dotted line represents to intend between the node packet exchange of employing, black node is represented the network boundary node, play the gateway effect, Bai Jiedian represents network backbone node, it can overlook IP over WDM network from the angle of node, here it must be emphasized that, in IP over WDM net, only need be on same link the identical (upper-layer protocol certainly of two physical interface speed of equity with physical index, also mutually equal as LAPW with IP), so the IP over WDM physical interface of various different rates can be arranged on each link in the net.What Fig. 4 described is network layer proposed by the invention, primitive graph of a relation between link layer and the physical layer, wherein LAPW provides two service access points, its identifier value (SAPI) equals decimal number " 4 " use for Ipv4, its identifier value (SAPI) equals decimal number " 6 " for Ipv6 usefulness, send out packet to link layer from network layer, use " DL-UNACK-DATA request " primitive, receive packet to network layer from link layer, use " DL-UNACK-DATA indication " primitive; Between link layer and physical layer, from the link layer to the physical layer, use " PH-DATA request " primitive link setup, use " PH-DATA indication " primitive then to represent to send out the link setup indication to link layer by physical layer.Send out packet to physical layer from link layer, use " PH-DATA request " primitive, receive packet to link layer, use " PH-DATA indication " primitive from physical layer.Fig. 5 is that the present invention uses conception figure in national IP over SDH/WDM core layer networking, wherein black circle is represented the core route exchange device based on IP over SDH/WDM equipment, small rectangular block is represented SDH existing on the present national backbone network or WDM transmission equipment, this example is that existing resource is given an example the existing transmission network management of the computer representation at white interface with present Chinese 8 * 8 SDH or wdm link transmission network; After each node city employing has the core switch router of IP over SDH interface, can form a packet switch core net that extends in all direction, the computer representation at black interface is about to the webmaster of the core switch router net of layout.Fig. 8 is that the present invention is in IP over SDH/WDM core layer networking application conception inside the province, wherein black circle is represented the core route exchange device based on IP over SDH equipment, the Xiao Bai circle is represented the branch line route exchange device based on IP over SDH/WDM equipment, REG is a regenerative repeater, ADM is an add-drop multiplexer, and LAN is a local area network (LAN); The each province is mostly with the SDH ring-shaped network at present, and this example is that existing resource is given an example with present Chinese each province SDH looped network or wavelength-division multiplex system (english abbreviation WDM) trunk transit network; Each districts and cities node city inside the province adopt have the core switch router of IP over SDH/WDM interface after, can form a packet switch core net that is extending in all direction inside the province.

Claims (9)

1. an adaptation method that is used for internet and the fusion of wavelength division multiplexing system comprises the following steps:

Receive packet from the network layer device of internet, the type of recognition data bag, the type generation service access point identifier according to identification converts packet to first kind frame and reflects the professional code-point of the segmentation that sends priority; Described first kind frame is packaged into the frame format of address field, the control field that comprises beginning flag, contains the service access point identifier, the information field that comprises described packet, Frame Check Sequence field and termination flag, forms the second class frame; The described second class frame is encapsulated into payload part, and inserts corresponding expense, add the A1 and the A2 byte of SDH (Synchronous Digital Hierarchy), form the 3rd class frame; With described the 3rd class frame with the transmission priority mapping segmenting professional code-point and reflected to the optical channel layer of wavelength division multiplexing system.

2. adaptation method as claimed in claim 1, the beginning flag of the described second class frame and termination flag are " 0x7E ".

3. adaptation method as claimed in claim 1, the value of the control field of the described second class frame are " 0x03 ".

4. adaptation method as claimed in claim 1 also comprises calculation procedure, utilizes generator polynomial 1+x+x ²+ x ⁴+ x ⁵+ x ⁷+ x ⁸+ x ¹⁰+ x ¹¹+ x ¹²+ x ¹⁶+ x ²²+ x ²³+ x ²⁶+ x ³², the second class frame all bits except that beginning flag, termination flag and Frame Check Sequence field are carried out verification, detect frame and in transmission course, whether go wrong.

5. adaptation method as claimed in claim 1, for the second class frame, the termination flag of former frame is the beginning flag of adjacent frame subsequently.

6. adaptation method as claimed in claim 1 sends one or more continuous byte of paddings between the second class frame.

7. adaptation method as claimed in claim 1, the network layer IP packet that described first kind frame is an internet, the described second class frame are wavelength division multiplex tethers road access regulation frames, described the 3rd class frame is an optical channel layer frame.

8. adaptation method as claimed in claim 7, described network layer IP packet are Ipv4 or Ipv6 data message.

9. adaptation method as claimed in claim 1, the largest passages number of the optical link system of wavelength division multiplexing system is 2 Nth power, and N is a positive integer, and channel type is:

STM-4/STM-4c, or OC-12/OC-12c, its bandwidth 622080 kilobits/second

STM-16/STM-16c, or OC-48/OC-48c, its bandwidth 2488320 kilobits/second

STM-64/STM-64c, or OC-192/OC-192c, its bandwidth 9953280 kilobits/second.

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