CN100433652C - Multiple data communication network system and its data transmission method - Google Patents
Multiple data communication network system and its data transmission method Download PDFInfo
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Abstract
The present invention discloses a multiple data communication network system which comprises data communication networks corresponding to a plurality of different applications; the adjacent data communication networks are connected through the same physical link; the data communication networks are mutually separated in a network layer and share physical bandwidth in a physical layer and a link layer. The present invention also discloses a method for the data transmission of the multiple data communication network system. The method is achieved by the steps that a data communication network mark is set to a protocol package which is sent by each protocol instance of the network layer of each network node to other network nodes; the marked protocol package is transmitted through the same physical link; each network node sends out the protocol packages received from the physical link to all the instances of a network layer protocol contained in the protocol packages; each instance of the network layer protocol processes the protocol packages according to the data communication network marks of the received protocol packages. By the present invention, the data communication networks corresponding to different applications share the physical bandwidth; the information isolation of the networks is guaranteed, and the safety is enhanced.
Description
Technical field
The present invention relates to network communications technology field, be specifically related to a kind of multiple data communication network system and data transmission method thereof.
Background technology
Along with the expansion of local telecommunication network and professional increasing, network kind and layer of structure are increasingly sophisticated.In the work of maintenance and management communication network, network management system is absolutely necessary, and is the key of operational management.But adopt the network of different technologies, even adopt the same technology rather than the product of identical manufacturer, because the webmaster interoperability is poor, the operation commercial city must be equipped with the management system of each producer.For solving the webmaster reunification, need special-purpose network management information transmission network that these management systems are connected with equipment or other related systems managed, the network management information transmission network of this special use is exactly DCN (data communication network).Architecture and standard according to the G.7712 data communication network of ITU-T (telecommunication standardization department of International Telecommunications Union), " DCN can design support; the distributed management communication related with TMN (telecommunication management network), communicate by letter and other operation communication application such as (official telephone/Speech Communication, software downloads etc.) with the related distributed signaling of ASTN (ASTN)." the DCN function structure as shown in Figure 1:
On DCN, need to support supervisory communications, signaling communication and other communication functions.For example, between the different assemblies of TMN, transmit management information, between the different assemblies of ASTN, transmit signaling information, between the different assemblies of other application, transmit load information etc.
G.7712 be not particularly limited the mode that DCN supports application, " according to different network designs, every kind of application can be supported by DCN that separates or identical DCN but mention." this shows that method identical at the different application design or separation DCN all is fine, but does not stipulate concrete implementation method G.7712.
One of existing DCN method for designing is the mode that DCN separates fully: be DCN of each Application Design, the physical layer between the different application DCN, link layer and network layer are separated fully.Its application model figure is as shown in Figure 2:
Two physical links (for example the D1-D3 expense in the SDH signal is formed physical link 1, and the D4-D12 expense is formed physical link 2) are arranged between network element A and the network element B.Management DCN utilizes physical link 1 as physical layer, that is to say that the administrative messag message between network element A and the network element B only transmits from physical link 1.Equally, signaling DCN utilizes physical link 2 as physical layer, that is to say that the signaling message message between network element A and the network element B only can transmit from physical link 2.Like this, just have two link layers at a network element internal and support management DCN and signaling DCN respectively, for example network element A just has two link layers: support the link layer of management DCN and the link layer of support signaling DCN.Correspondingly, also have two network layer protocols at a network element internal and support management DCN and signaling DCN respectively.
As seen, in this implementation, management DCN is walked different physical links with signaling DCN, and the bandwidth of physical link 1 can not be used for signaling DCN like this, even at a time, physical link 2 at full capacity and 1 free time of physical link.Equally, the bandwidth of physical link 2 can not be used for management DCN.Can not reach the purpose of sharing the physical link bandwidth.
Two of existing DCN method for designing is modes that different application adopts identical DCN: different application all is to use same DCN.Its application model is as shown in Figure 3:
By a DCN interaction message, these message both can be signaling messages, also can be administrative messags between two network elements.Only need a physical link between network element A and the network element B, both can transmit signaling message on this physical link also can transfer management message.This moment, the bandwidth of physical link was shared, and for example a certain moment signaling message might absorb physical link bandwidth.
Owing to have only a DCN,, also have only a link layer and network layer therefore at a network element internal.The user of a use and management application also can see all signaling application messages simultaneously, and this application mode has reduced the fail safe of network.
Summary of the invention
The purpose of this invention is to provide multiple data communication network system, so that the different pieces of information communication network can be shared the physical layer bandwidth, but still is released state in network layer, improves the fail safe of network.
Another object of the present invention provides a kind of method of multiple data communication network system transfer of data, can not share the physical link bandwidth when different application is used different DCN in the prior art and cause the wasting of resources to overcome, and the shortcoming of different application poor stability when using same DCN, make the data communication network of corresponding different application can share band width in physical, and the information between the assurance different application is isolated the fail safe of enhancing DCN.
For this reason, the invention provides following technical scheme:
A kind of multiple data communication network system, comprise: the data communication network of corresponding a plurality of different application, link to each other by same physical link between the adjacent data communication network, each data communication network is separated from each other in network layer, share band width in physical at physical layer and link layer, and under each protocol package of transmitting on the described physical link has it sign of data communication network.
Alternatively, described data communication network comprises:
The supervisory communications network related with telecommunication management network and/or with the related signaling communication network network of automatic switching network and/or with the related operation communication network of operation.
A kind of multiple data communication network system data transmission method said method comprising the steps of:
Each network layer protocol example on each network node is identified to the protocol package setting data communication network that other network nodes send;
Protocol package after the sign is transmitted by same physical link;
The protocol package that each network node is received from described physical link is distributed to all examples of this protocol package belonging network layer protocol;
Each network layer protocol example is handled this protocol package according to the data communication network sign of the protocol package of receiving.
The step that the described protocol package setting network that each network layer protocol example on each network node is sent to other network nodes identifies comprises:
Each data communication network dividing is not provided with a unique data communication network sign;
The data communication network sign of data communication network correspondence each network layer protocol example on the network node is added this protocol instance in the protocol package that other network nodes send under.
The described step that the data communication network of data communication network correspondence identifies under this protocol instance of interpolation in protocol package is specially:
Described data communication network sign is added in the specific fields of protocol header, perhaps carry described data communication network sign by the extended field in the protocol package.
Described data communication network sign is specially: encrypted message or domain identifier or privately owned sign.
The step that described each network layer protocol example is handled this protocol package according to the data communication network sign of the protocol package of receiving comprises:
The data communication network sign of each network layer protocol example by data communication network correspondence under it differentiated the data communication network sign of the protocol package received;
If two data communication network signs are complementary, then this protocol package of present networks layer protocol instance processes;
Otherwise present networks layer protocol example abandons this protocol package.
The step that the data communication network sign of described each network layer protocol example by data communication network correspondence under it differentiated the data communication network sign of the protocol package received is specially:
Differentiate or differentiate by the simple coupling of data communication network sign by predetermined authentication arithmetic.
By above technical scheme provided by the invention as can be seen, different data communication networks is used in the corresponding different application of the present invention respectively, and these data communication networks are separated in network layer, shares in physical layer and link layer.For all network layer protocols that need use, the method that adopts the DCN sign to differentiate realizes the isolation of packet between different DCN of this agreement, thereby realizes supporting the ability of a plurality of DCN.Because different DCN share physical link and link layer, guaranteed that therefore the data communication network of different application is shared band width in physical, saved bandwidth resources effectively; Be identified at by DCN simultaneously and isolated inner separately information between the different pieces of information communication network, thereby guaranteed the isolation of information between the different application, the fail safe that has improved data communication network.
Description of drawings
Fig. 1 is a DCN function structure schematic diagram;
Fig. 2 is the complete separate mode implementation model of a different application DCN schematic diagram in the prior art;
Fig. 3 is that different application adopts identical DCN mode implementation model schematic diagram in the prior art;
Fig. 4 is a multiple data communication network system implementation model schematic diagram of the present invention;
Fig. 5 is the realization flow figure of the inventive method;
Fig. 6 is the application schematic diagram of the inventive method in the ospf protocol example of different DCN.
Embodiment
Core of the present invention is that corresponding different application uses different data communication networks respectively, and these data communication networks are separated in network layer, shares in physical layer and link layer.For all network layer protocols that need use, the method that adopts the DCN sign to differentiate realizes the isolation of packet between different DCN of this agreement, thereby realizes supporting the ability of a plurality of DCN.
The present technique field personnel know, the target of network management is to maximally utilise Internet resources, improves the running quality and the efficient of network, provides favorable service to the user.For the network of different application, need the information transmitted also different between its different assemblies, such as, management information, signaling information, load information etc.Therefore, Network Management for convenience, corresponding different application use preferably independently that data communication network comes to be its different component passes information needed.
In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with drawings and embodiments.
With reference to Fig. 4, Fig. 4 shows multiple data communication network system implementation model of the present invention:
By this figure as seen, the data communication network of the corresponding a plurality of different application of the present invention links to each other by same physical link between the adjacent data communication network, and each data communication network is separated from each other in network layer, shares band width in physical in physical layer and link layer.
That is to say, the data communication network of these different application, such as the supervisory communications network related and/or with the related signaling communication network network of automatic switching network and/or with the related operation communication network of operation etc. with telecommunication management network, shared physically same link, and logically (network layer) is separated from each other.
The present technique field personnel know, physical layer is the lowermost layer of whole OSI (open system interconnection) reference model, and its task provides the physical connection of network, utilizes physical transmission medium to provide the bit stream transmission for data link layer.The main task of this layer is the signal of telecommunication at the transmission over communication lines data bit.Physical layer protocol has mainly been stipulated the interface standard between computer or terminal and the communication equipment, comprises the characteristic of the machinery of interface, electric, function and four aspects of rules.Mainly comprising cable, physical port and auxiliary device, all is to be operated in this level in network as twisted-pair feeder, coaxial cable, wiring unit (as network interface card etc.), serial ports and parallel port etc.The base unit that physical layer transmits is a bit.The function of data link layer is to realize the transmission service of zero defect.Physical layer only provides transmittability, but signal can occur inevitably the distortion and be interfered, cause error of transmission.The major function of data link layer has sets up and removes data link; Information is assembled framing by certain format, so that zero defect ground transmits.Have in addition handle reply, functions such as error control, order and flow control.The base unit that data link layer transmits is a frame.Its common agreement has two classes: a class is character-oriented transmission control protocol, as BSC (BISYNC); Another kind of is bit-oriented transmission control protocol, as HDLC (High level data link control).Network layer belongs to the intermediate level among the OSI, and what it solved is between network and the network, promptly internet communication issue.The major function of network layer provides route, promptly selects to arrive the optimal path of destination host, and along this path transmissioning data bag.In addition, network layer is also wanted to eliminate network congestion, has the ability of flow control and Congestion Control.The base unit that network layer transmits is grouping (or bag), and X.25 packet oriented protocol is exactly the agreement of network layer.Data communication network is supported physical layer, data link layer and Network layer function.
In order to guarantee that each data communication network is separated from each other in network layer, need make the sign of data communication network under each protocol package of transmitting on the physical link has it.
Such as, the network layer protocol example A1 on the network element A belongs to the DCN that management is used, and network layer protocol example A2 belongs to the DCN that signaling is used; Network layer protocol example B1 on the network element B belongs to the DCN that management is used, and network layer protocol example B2 belongs to the DCN that signaling is used.
Then A1 has the DCN sign that management is used in the protocol package that other network elements of DCN that management is used send, and A2 has the DCN sign that signaling is used in the protocol package that other network elements of DCN that signaling is used send, and the DCN of different application sign is different, these different protocol package are carried by same physical link, thereby make it can share band width in physical, save network bandwidth resources.
Equally, B1 has the DCN sign that management is used in the protocol package that other network elements of DCN that management is used send, and B2 has the DCN sign that signaling is used in the protocol package that other network elements of DCN that signaling is used send, and the DCN of different application sign is different, and these different protocol package are carried by same physical link.
After each network element is received the protocol package of other network elements transmissions, send the all-network layer protocol entity in this network element to, identify according to the DCN that carries in the protocol package by each network layer protocol entity and to differentiate whether this protocol package issues the protocol package of oneself, for the protocol package of issuing oneself, then handle accordingly; If difference is issued the protocol package of oneself, then it is abandoned.Realized that like this, promptly the different pieces of information communication network protocol wraps in the separation of network layer.
With reference to Fig. 5, Fig. 5 shows the realization flow of the inventive method, may further comprise the steps:
Step 501: each network layer protocol example on each network node is identified to the protocol package setting data communication network DCN that other network nodes send.
Each data communication network dividing is not provided with a unique DCN sign, the DCN sign of data communication network correspondence each network layer protocol example on the network node is added this protocol instance in the protocol package that other network nodes send under.The protocol instance that belongs to same data communication network is provided with identical DCN sign.
These DCN signs can be encrypted message or information such as domain identifier or privately owned sign.For some particular network layer protocol examples, can only adopt wherein a kind of characteristic information as its DCN sign, during interpolation, can be added in certain field of protocol header, perhaps carry this DCN sign by the extended field in the protocol package.
If adopt the DCN sign of pin mode, then this password itself also can be the form of encrypting.
Step 502: the protocol package after will identifying is by same physical link transmission.
On each network node, have a plurality of network layer protocol example, and each network layer protocol example may corresponding different data communication networks.These network layer protocol example are carried to the protocol package of having added the DCN sign on same the physical link and send when other network node to transmit protocol bags.
Step 503: the protocol package that each network node is received from physical link is distributed to all examples of this protocol package belonging network layer protocol.
Step 504: each network layer protocol example is handled this protocol package according to the DCN sign of the protocol package of receiving.
At first, after the link layer of certain network element receives the protocol data that other network element link layers send over, send to the all-network layer protocol example of this network element; After network layer protocol example receives the packet that link layer passes over, check the DCN sign that this packet carries, if this sign DCN sign corresponding with its affiliated data communication network is complementary, then show it is the data that other network elements in the own affiliated data communication network send over, at this moment, by this packet of normal process flow processing; If do not match, then show the data that are not that other network elements in the own affiliated data communication network send over, at this moment, abandon this packet.
When the DCN sign that the packet that receives is carried is differentiated, can check by the marking matched method of simple DCN, also can differentiate by comparatively complicated authentication arithmetic.
Be example with OSPF (ospf) protocol instance below, further describe the implementation procedure of the inventive method.
Ospf protocol is that promptly gateway and router are all an autonomous system inside by a kind of Interior Gateway Protocol of IETF (Internet network engineering portion) exploitation.OSPF is a link-state protocol or OSPF.This agreement is carried out Route Selection according to the purpose IP address in the IP packet, in case determined how to be an IP packet selection path, just packet is mail in the selected path, do not need extra packet header, promptly do not have extra encapsulation.All safeguard a unified database of describing the autonomous system topological structure in each router of operation OSPF, this database is made up of the continuous network state information (router that this network connected) of local state information (interface message, neighbor information that this router can be used), the router of each router, external status information (external routing information of this autonomous system) etc.Each router spreads corresponding state information in the autonomous system scope.
All same algorithms of router parallel running, constructing with it according to the topological database of this router oneself is the shortest path tree of root node, the leaf node of this shortest path tree is other routers of autonomous system inside.When there was the route of many identical costs in the same purpose router of arrival, OSPF can be implemented in dispense flow rate on the mulitpath.
Special authentication field (IETF RFC2328) is arranged in the OSPF heading of disperse state information, and this authentication field can be supported simple password matching way, also can support encrypted authentication.Adopt the simple password method for authenticating to be described below.
As shown in Figure 6, network element A and network element B have moved two ospf protocol examples.The OSPF example 1 of network element A is identical with the message password of the ospf protocol example 1 of network element B, all is set to " Iamone ", and the OSPF example 2 of network element A is identical with the message password of the ospf protocol example 2 of network element B, all is set to " Iamtwo ".These two message passwords are the DCN sign.When the ospf protocol example 1 of network element A sends message to network element B, with the message password setting is " Iamone ", when the link layer of network element B is received message, send to OSPF example 1 and OSPF example 2 simultaneously, ospf protocol example 1 is checked through the message password and is " Iamone ", with its password coupling, therefore message is carried out subsequent treatment, ospf protocol example 2 is checked through the message password and does not match for the message password " Iamtwo " of " Iamone " and own setting, so abandons this message.
Like this by this DCN of message password sign, the ospf protocol example 1 of network element A and the ospf protocol example 1 of network element B can intercommunications, the routing iinformation of DCN under generating behind their exchange messages.The routing iinformation of DCN under the OSPF example 2 of same network element A and the OSPF example of network element B 2 exchange messages generate.Because the message password is the marking matched mechanism of DCN just, the routing iinformation of these two DCN is independently.When one of them DCN of user capture, can only see the route of this DCN, and can't see the route of other DCN, therefore can not have access to application based on other DCN, so just strengthened the fail safe of other DCN.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (8)
1, a kind of multiple data communication network system comprises: the data communication network of corresponding a plurality of different application, link to each other by same physical link between the adjacent data communication network, and it is characterized in that,
Each data communication network is separated from each other in network layer, shares band width in physical at physical layer and link layer, and under each protocol package of transmitting on the described physical link has it sign of data communication network.
2, system according to claim 1 is characterized in that, described data communication network comprises:
The supervisory communications network related with telecommunication management network and/or with the related signaling communication network network of automatic switching network and/or with the related operation communication network of operation.
3, a kind of multiple data communication network system data transmission method is characterized in that, said method comprising the steps of:
Each network layer protocol example on each network node is identified to the protocol package setting data communication network that other network nodes send;
Protocol package after the sign is transmitted by same physical link;
The protocol package that each network node is received from described physical link is distributed to all examples of this protocol package belonging network layer protocol;
Each network layer protocol example is handled this protocol package according to the data communication network sign of the protocol package of receiving.
4, method according to claim 3 is characterized in that, the step that the described protocol package setting network that each network layer protocol example on each network node is sent to other network nodes identifies comprises:
Each data communication network dividing is not provided with a unique data communication network sign;
The data communication network sign of data communication network correspondence each network layer protocol example on the network node is added this protocol instance in the protocol package that other network nodes send under.
5, method according to claim 4 is characterized in that, the described step that the data communication network of data communication network correspondence identifies under this protocol instance of interpolation in protocol package is specially:
Described data communication network sign is added in the specific fields of protocol header, perhaps carry described data communication network sign by the extended field in the protocol package.
6, method according to claim 3 is characterized in that, described data communication network sign is specially:
Encrypted message or domain identifier or privately owned sign.
7, method according to claim 3 is characterized in that, the step that described each network layer protocol example is handled this protocol package according to the data communication network sign of the protocol package of receiving comprises:
The data communication network sign of each network layer protocol example by data communication network correspondence under it differentiated the data communication network sign of the protocol package received;
If two data communication network signs are complementary, then this protocol package of present networks layer protocol instance processes;
Otherwise present networks layer protocol example abandons this protocol package.
8, method according to claim 7 is characterized in that, the step that the data communication network sign of described each network layer protocol example by data communication network correspondence under it differentiated the data communication network sign of the protocol package received is specially:
Differentiate or differentiate by the simple coupling of data communication network sign by predetermined authentication arithmetic.
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