CN103327027A - Content-centric network bottom implementation method, content-centric network and communication method - Google Patents
Content-centric network bottom implementation method, content-centric network and communication method Download PDFInfo
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Abstract
The invention relates to the technical field of computer architectures, in particular to a content-centric network bottom implementation method, a content-centric network and a communication method realized based on the content-centric network. The content-centric network bottom implementation method comprises the steps that network nodes are connected through a network card and a data path, and the IP address setting of the network card is closed; the operating mode of the network card is set to be a promiscuous mode; the length value of the maximum transmission unit of the network card is set so that an intact content data package can be accommodated; a bottom interface face, based on an original socket, of the network nodes is established; a physical interface of the network nodes and the bottom interface face are bound, and the network card and a specific transmitting interface are bound; content data are named and stored on a content originating node, and the content originating mode broadcasts the prefixes of the names of the content data through an external network card.
Description
Technical field
The present invention relates to the Computer Architecture technical field, the communication means that is specifically related to a kind of content center network bottom layer implementation method, content center network and realizes according to this content center network.
Background technology
Along with the development used on the Internet changes, expose gradually problems based on the existing the Internet of TCP/IP, poor stability is not for example supported mobilely, unreliable, lacks flexibility, the validity restriction is to problems such as new application ossify.For these problems, lot of domestic and international research institution carries out design studies to the architecture of future network at present.
Content center network (Content Centric Networking, CCN) be one of the important achievement of current Future-oriented Internet Architecture research, its core concept is the end-to-end communication mechanism that changes the current internet terminal room, content and terminal location are peeled off, the services such as storage and multi-party communication are provided by publish/subscribe normal form (Publish/Subscribe Paradigm).Specifically, be exactly that all contents that transmit in the network can be regarded information object as, can be described as a network that information is interconnected, but not main frame is interconnected, its kernel object is information, the name by information identifies each information.Concerning network, what wherein flow all is the information that name is arranged, and network can be distinguished each information, but the specifying information meaning, network is not also known, explains by information producer and consumer's upper layer application.Whole network and terminal thereof just under the driving of various information operation got up, and the effect of network is exactly to manage flowing and buffer memory of all information, and with the requestor of the correct quick response message of information.User or use can a concern information itself, and be indifferent to other attributes of block of information, such as the owner attribute that need not be concerned about information.
The profile of content center network architecture is very similar with current TCP/IP network, all is the hourglass model, and maximum not being both at " thin waist " located to have replaced IP with content blocks (Content Chunk).From the angle of network, use exactly data are named the name that has replaced physical host.In addition, built-in memory function in the network is used for the data of buffer memory process, accesses the response time of same data in order to shorten other users, can greatly reduce the flow in the network simultaneously.
Content center network service is driven by data consumer, and data can be carried out the transmission of piece level, two kinds of bag types is arranged: interest bag (Interest Packet) and packet (Data Packet).The consumer comes request content by sending the interest bag, if monitor node this content is arranged, and then responds.Interest bag and packet all and location independent, on a broadcast medium, if the request of an interest bag is arranged, then other can share this request to the interested consumer of same content.
The realization of current content center network is based on the overlay network (Overlay Network) on the ICP/IP protocol.Its objective is so that the content center network can compatiblely have the TCP/IP network now, dispose operation at existing network.But owing to based on ICP/IP protocol, can not give full play to the content center network design in the advantage aspect content delivery, fail safe and the mobility at architectural framework.Such as, after the mobile network was switched, communication end point need to obtain the IP address again; In the content delivery process, need to set up UDP(User Datagram Protocol, User Datagram Protoco (UDP)) or TCP(Transmission Control Protocol, transmission control protocol) connect, when occurring link or node failure in the network, transfer of data just occurs and interrupt; Because the existence of address being arranged, the assailant still can the identification content source and is followed the trail of.Simultaneously, the maintenance of nerve of a covering itself and transmission cost are also higher, have also offset the advantage of the contents distribution that the content center network brings, and the advantage that can not take full advantage of multi-source and get.Therefore, be necessary to have proposed a kind of content center network bottom layer implementation method, making up one by the method does not have the ICP/IP protocol restriction fully, and the pure content center network that communicates by numerical nomenclature is with design advantage and the potentiality of giving full play to the content center network.
Summary of the invention
The technical problem that (one) will solve
The object of the present invention is to provide a kind of content center network bottom layer implementation method, thereby bring into play more fully design advantage and the potentiality of content center network.
(2) technical scheme
Technical solution of the present invention is as follows:
A kind of content center network bottom layer implementation method comprises:
Network node is linked to each other by network interface card and data path, and close the setting of network interface card IP address;
The mode of operation of described network interface card is set to promiscuous mode;
The maximum transmission unit length value of network interface card is set to hold complete content-data bag;
Create network node based on the physical layer interface face of raw socket;
The physical interface of network node and the physical layer interface face of this network node are bound, with network interface card and the binding of specific forwarding interface;
The content-data name is stored in content source node, and described content source node is by the prefix of export-oriented network interface card broadcasted content numerical nomenclature.
Preferably, described network interface card is ethernet nic, and an ethernet frame is exactly a complete content-data bag.
The present invention also provides a kind of content center network of realizing according to above-mentioned any one content center network bottom layer implementation method:
A kind of content center network comprises at least two network nodes that link to each other by network interface card and data path; Described network interface card IP address arranges and is closed, and mode of operation is promiscuous mode; The maximum transmission unit length value of described network interface card can be held complete content-data bag; Described network node comprises the physical layer interface face based on raw socket, the physical layer interface face binding of the physical interface of network node and this network node, network interface card and the binding of specific forwarding interface; The content-data name is stored in content source node, and described content source node is by the prefix of export-oriented network interface card broadcasted content numerical nomenclature.
The present invention also provides a kind of communication means of realizing according to the foregoing central site network:
A kind of content center network communication method comprises:
Interested first request network node of content-data bag is utilized this content-data bag of interest bag request, after content source node is received this interest bag, the content-data bag is sent to described first request network node;
To interested other request network node of this content-data bag, from by way of the buffer memory of other network node obtain this content-data bag or to this content-data bag of content source node request.
(3) beneficial effect
The content center network bottom layer implementation method that the embodiment of the invention provides is compared with existing content center network implementation approach based on nerve of a covering, rely on the Ethernet of existing widespread deployment, encapsulated content packet on the Ethernet protocol frame, with the network migration cost of minimum, realized that one does not rely on mailing address fully and only relies on the information network of content name itself.Owing to need not the IP address, need not MAC Address, therefore there has not been the problem of IPv4 address depletion; Owing to without data flow, therefore can or not block up because of single link failure, causing the bottleneck of transfer of data; Realized the protocol stack flattening, be about to 7 layers ICP/IP protocol, 3 layers of boil down tos, i.e. physical transport layer, network layer and application layer; And, because the extensive oversized frame that uses has significantly promoted efficiency of transmission.
Description of drawings
Fig. 1 is the schematic flow sheet of content center network bottom layer implementation method in the embodiment of the invention;
Fig. 2 is that the content center network bottom layer realizes that protocol stack structure changes in the embodiment of the invention;
Fig. 3 is the star network topology that the content center network bottom layer realizes in the embodiment of the invention;
Fig. 4 is the Star topology data transmission performance schematic diagram that the content center network bottom layer realizes in the embodiment of the invention;
Fig. 5 is the linear network topology that the content center network bottom layer realizes in the embodiment of the invention;
Fig. 6 is the linear topology data transmission performance schematic diagram that the content center network bottom layer realizes in the embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described further.Following examples only are used for explanation the present invention, but are not used for limiting the scope of the invention.
A kind of content center network bottom layer implementation method at first is provided in the present embodiment, as shown in Figure 2, has mainly may further comprise the steps:
Network node is linked to each other by network interface card and data path, and close the setting of network interface card IP address, this network will move the CCN agreement fully; In the present embodiment, network interface card is ethernet nic commonly used, and above-mentioned data path can be netting twine;
The mode of operation of described network interface card is set to promiscuous mode, thereby can broadcast the reception with the content-data bag, to guarantee the physical link of content center network;
Maximum transmission unit length value (the Maximum Transmission Unit of network interface card is set, MTU), thereby can hold complete content-data bag, guarantee that the content-data of content center network wraps in the transmission course not divided, such as, if the content-data bag is 4KB, MTU then is set greater than 4KB, if the content-data bag is 8KB, MTU then is set greater than 8KB, MTU maximum view card and deciding for example, can be set to 16KB; In the present embodiment, described network interface card is ethernet nic, and an ethernet frame is exactly a complete content-data bag.
Create network node based on the physical layer interface face(interface surface of raw socket (raw socket)); This step is finished by the code of revising current content center network;
With the physical layer interface face binding of the physical interface of network node and this network node, and with network card binding to some specific forwarding interfaces, directly Control ethernet frame layer carries out the transmitting-receiving of content-data bag;
The content-data name is stored in the content source node of content center network, described content source node is by the prefix of export-oriented network interface card (out-bounding) broadcasted content numerical nomenclature; For example, content-data called after/tsinghua/saturn/test can broadcast the prefix that this content-data is named by export-oriented network interface card.
The present invention also provides a kind of communication means of realizing according to the foregoing central site network:
A kind of content center network communication method comprises:
To interested first request network node of content-data bag, utilize this content-data bag of interest bag request, after content source node is received this interest bag, the content-data bag is sent to described first request network node; For example, the requestor adopts this content-data bag of " ccngetfile ccnx:/tsinghua/saturn/test test " instruction request, and final content source node has been issued the requestor with content-data bag test;
To interested other request network node of this content-data bag, from by way of the buffer memory of other network node obtain this content-data bag or to this content-data bag of content source node request.
The present invention also provides a kind of content center network of realizing according to above-mentioned any one content center network bottom layer implementation method:
A kind of content center network comprises at least two network nodes that link to each other by network interface card and data path; Described network interface card IP address arranges and is closed, and mode of operation is promiscuous mode; The maximum transmission unit length value of described network interface card can be held complete content-data bag; Described network node comprises the physical layer interface face based on raw socket, the physical layer interface face binding of the physical interface of network node and this network node, network interface card and the binding of specific forwarding interface; The content-data name is stored in content source node, and described content source node is by the prefix of export-oriented network interface card broadcasted content numerical nomenclature.
The bottom layer realization that has provided the content center network among Fig. 2 is than the change of the protocol infrastructure of the current content center network of realizing based on nerve of a covering; Table 1 and table 2 have provided the content center network bottom layer and have realized the difference that rear ethernet frame carries.Because the bottom layer realization method of content center network relies on content-data name route, the MAC Address of ethernet frame agreement can be ignored, and this part space also can be used for the carrying of content center network.As shown in table 1, be common ethernet frame structure; In Ethernet, an ethernet frame is exactly a complete content-data bag.An ethernet frame is to begin with 78 binary sync bits and 18 binary framing bits, and the centre is 60 to 1518 binary load region, then is the verification sequence of 4 bytes, is the stop bits of 12 bytes at last.
Table 1 ethernet frame structure
Frame structure when table 2 has shown Ethernet oversized frame (jumbo frame) carrying content center network packet; When Ethernet oversized frame carrying content center network packet, wherein the MAC Address territory of ethernet frame and type length field will no longer need, therefore can unify to offer the content-data bag use of content center network, then be the verification sequence of 4 bytes, is the stop bits of 12 bytes at last.
Table 2 ethernet frame carrying CCN Web content piece
Table 3 is experimental results of protocol efficiency, has provided the nerve of a covering realization of content center network and the protocol transmission efficient comparative result of bottom layer realization.A content-data bag size of acquiescence was 4772 bytes (comprising valid data, signature, coded message etc.) during current content center network was realized, the valid data of transmission are 4096 bytes.And traditional ethernet frame once can only transmit the content of 1500 bytes, therefore the content-data bag of 4772 bytes will be cut into 4 ethernet frame transmission in the content center network, by calculating the efficiency of transmission of the content center procotol that can obtain respectively content center network coverage net and original Ethernet frame; And adopt table 2 Ethernet oversized frame, if frame length is 7KB to the maximum, then every frame can carry a content center network packet.
The nerve of a covering of table 3CCN is realized comparing with bottom layer realization protocol transmission efficient
Shown in computing formula in the table 3,54 bytes are header lengths of a TCP/IP ethernet frame; For transfer of data, the efficient of content center network coverage net is approximately 82%, and the efficient of the content center network of original Ethernet frame is approximately 86%, and protocol transmission efficient will improve 4.5%; This result is that comparison operators is rationally discussed the result; In theory, content center network coverage net is realized the consumption of existing TCP header, and the consumption of signature and coding is arranged again; And the content center network bottom layer realizes having saved the TCP/IP/Ethernet header, so efficient can be higher.
Provided on the time delay of download content data the result of the performance comparison experiment of the realization of the nerve of a covering of content center network and bottom layer realization in the table 4.Experimental situation can realize and bottom layer realization with reference to the nerve of a covering between two network nodes among the figure 2; Can see from table 4, bottom layer realization has better delay performance.
The nerve of a covering of table 4CCN is realized the download time delay contrast with bottom layer realization
Fig. 3 is a simple example, and the Star topology of having illustrated the content center network bottom layer to realize is tested; Be illustrated as a star network topology that creates according to above-mentioned implementation method, wherein comprise 4 network nodes, network node A, B, C and R are deployed as Star topology.
Fig. 4 illustrates the transmission speed comparative structure of two groups of downloading datas that obtain according to experiment among Fig. 3; Network node B all asks for file not of uniform size to A and network node C to A, and B is prior to A on the time.As we can see from the figure, because the buffer memory of network node R, network node C downloading rate has 2-3 lifting doubly.Network node A, B, C all configure two network interface cards, and network node R has configured 3 network interface cards.In the experiment, the (SuSE) Linux OS of network node operation is centos5.564 position version, and the network interface card model of employing is TP-LINK TG-3269C, and supporting MTU the longest is 7018 bytes.
Fig. 5 is another simple example, and the linear topology of having illustrated the content center network bottom layer to realize is tested; A linear network topology that creates according to above-mentioned implementation method, network node A wherein, B, C is deployed as linear topology, and network node B all asks for file not of uniform size to A and network node C to A, asks for separate twice, B is prior to A on time, and B empties buffer memory after asking for data to A.
Fig. 6 illustrates the transmission speed comparative result of two groups of downloading datas that obtain according to experiment among Fig. 5; As we can see from the figure, it is a jumping that network node B obtains data to A, and it is two jumpings that network node C obtains data to A, and along with the transmission data file size increases, performance difference increases gradually.
Above execution mode only is used for explanation the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; in the situation that do not break away from the spirit and scope of the present invention; can also make a variety of changes and modification, so all technical schemes that are equal to also belong to protection category of the present invention.
Claims (4)
1. a content center network bottom layer implementation method is characterized in that, comprising:
Network node is linked to each other by network interface card and data path, and close the setting of network interface card IP address;
The mode of operation of described network interface card is set to promiscuous mode;
The maximum transmission unit length value of network interface card is set to hold complete content-data bag;
Create network node based on the physical layer interface face of raw socket;
The physical interface of network node and the physical layer interface face of this network node are bound, with network interface card and the binding of specific forwarding interface;
The content-data name is stored in content source node, and described content source node is by the prefix of export-oriented network interface card broadcasted content numerical nomenclature.
2. content center network bottom layer implementation method according to claim 1 is characterized in that, described network interface card is ethernet nic, and an ethernet frame is exactly a complete content-data bag.
3. the content center network that content center network bottom layer implementation method according to claim 1 and 2 realizes comprises at least two network nodes that link to each other by network interface card and data path; It is characterized in that, described network interface card IP address arranges and is closed, and mode of operation is promiscuous mode; The maximum transmission unit length value of described network interface card can be held complete content-data bag; Described network node comprises the physical layer interface face based on raw socket, the physical layer interface face binding of the physical interface of network node and this network node, network interface card and the binding of specific forwarding interface; The content-data name is stored in content source node, and described content source node is by the prefix of export-oriented network interface card broadcasted content numerical nomenclature.
4. the communication means that content center network according to claim 3 is realized is characterized in that, comprising:
Interested first request network node of content-data bag is utilized this content-data bag of interest bag request, after content source node is received this interest bag, the content-data bag is sent to described first request network node;
To interested other request network node of this content-data bag, from by way of the buffer memory of other network node obtain this content-data bag or to this content-data bag of content source node request.
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