CN101127691A - A method for implementing stream-based policy routing on network processor - Google Patents
A method for implementing stream-based policy routing on network processor Download PDFInfo
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Abstract
The utility model discloses a stream-based strategic routing method on a network processor, comprising following procedures: after receiving the message, the processing is carried out by a stream analytic module, and the heading key assignment is extracted and supplied to a stream sorting module to process the key assignment; a stream distribution module decides to send the message to the specific threading of the stream sorting module. The searching and handling are carried out by a stream searching module in the stream database to see whether the same stream mark as that of the message already exists; if the search succeeds, the message is handed to the stream distribution module for disposal; and then the message is transferred to a stream forwarding module for further processing through the stream distribution module. If the search fails, the message is transferred to a renewal module for disposal. The stream renewal module establishes relevant stream list entries and then stores them in the stream database, and then, begins a new search. The utility model can adopt different routing strategy according to various application types, so that the availability of the network is promoted.
Description
Technical field
The present invention relates to a kind of method of tactful route, particularly a kind of method that on network processing unit, realizes based on the tactful route that flows.
Background technology
Traditional routing policy all is to use the routing table that derives from from Routing Protocol, carries out message forwarding according to destination address.Under this mechanism, router can only provide more single routing mode for the user according to the destination address of message, and it more is the forwarding problems that solves network data, and differentiated service can not be provided.
Route based on strategy provides than traditional Routing Protocol message forwarding and the stronger control ability of storage for network manager.Route based on strategy is stronger than traditional route control ability, uses more flexibly, and it makes the network manager not only can be according to destination address, and can select forward-path according to protocol type, message size, application, IP source address or other strategy.Strategy can define the QoS that message is transmitted on the load balancing of controlling between a plurality of routers, the single link according to the needs of practical application or satisfy certain particular demands.
The strategy route provides a kind of like this mechanism: carry out message forwarding according to the standard that network manager is formulated.This standard is specified according to the application demand of reality, and its foundation can be one or more the combination in protocol type, application, message size or the IP source address.
When packet was transmitted through router, router mated packet according to predefined strategy, if match a strategy, just transmits according to the route of this tactful appointment; If do not match any strategy, just use every in the routing table message to be carried out route according to destination address.
People call different business to the user in data types different on the internet, such as the WWW type service, ftp business, TELNET business or the like.According to existing routing policy, core business, sensitive traffic, emphasis user's resource can't preferentially be ensured, causes utilization efficiency of network resources low.
Summary of the invention
In order to address the above problem, the invention provides a kind of method that on network processing unit, realizes based on the tactful route that flows, (wherein stream is meant the data flow based on data type), this method can be taked different routing policies according to different application types and network condition.
The present invention realizes by following scheme: a kind of method based on the tactful route that flows that realizes on network processing unit comprises the steps:
(1) behind the reception message, handled by the stream parsing module, this module is extracted and extract a plurality of independently fields formation key assignments from heading, offers the traffic classification module;
(2) the traffic classification module is handled key assignments according to collocation strategy;
(3) according to the result of traffic classification module, the stream distribution module determines message is sent to which thread of traffic classification module;
(4) after message is delivered to the thread of traffic classification module, search module, search processing by stream;
(5) search flow database, whether exist fail to be sold at auction identical to exist with this message;
(6) if search successfully, then message is given the stream distribution resume module;
(7) message is sent to a circulation module through the stream distribution module and does further processing;
(8) if the 5th step was searched failure, illustrate that the stream list item of phase homogeneous turbulence is not also set up, give update module and handle;
(9) the stream update module is set up relevant stream list item, deposits in the flow database, execution in step (5) again.
The stream parsing module extracts the key assignments that a plurality of independently fields are used for constituting 128 bits in the described step (1) from heading, the length of each field is no more than 16 bytes, total field length is no more than 128 bits, if total field length is less than 128 bits, insufficient section is in the zero padding of position, the end.
In three layers of head of message, can extract field: source IP, purpose IP, protocol type; In four layers of head of message, can extract field: source port, destination interface.
Collocation strategy in the described step (2) can comprise:
(a) according to protocol type, IP address and port, different business is routed to different links, realize professional differential service.
(b) resolve by carrying out the session service type, identify professional agreement and payload keyword, applied business is mapped in the specific stream of a certain class, and distributes suitable traffic identifier (flow ID), carry out label switched according to flow ID, realize the tactful route of dialogue-based type of service.
(c) in some cases, because static tactful route can't change according to the dynamical state of link-quality, cause link load to have evident difference, professional owing to be routed on the link by static policies such as a large amount of P2P, core business is routed on the high-quality high-quality link by strategy.When core business out of service or professional considerably less, and the P2P link is because the mass data transmission has caused serious congestion, just should adopt routing policy this moment based on the QoS quality optimization, do not influencing under the normal core business QoS quality prerequisite, the P2P business of part time priority is being routed on the high-quality link.
The processing method of traffic classification module can be in the described step (2): according to the key assignments of 128 bits, key assignments to 128 bits carries out CRC7 calculating, obtain one 7 bit value, the list item of 128*9 bit is arranged, obtain 9 bit values that use to the stream distribution module as index search.
Described step (9) stream update module is provided with traffic identifier by identification message traffic type or connection type, sets up relevant stream list item.
The invention has the beneficial effects as follows:
1. can in IP network, realize being similar to the private line service of virtual circuit, can take different routing policies according to different application types.Can carry out tactful route according to the situation of real network environment, the reasonably optimizing network load condition, the data that some is professional are routed on the link of a certain priority, by the business of high-quality link bearer high priority, by common link bearer general business.To optimize the link utilization situation of enterprise and operator so greatly, reduce investment outlay, optimize network configuration, increase network utilization.
2. adopt tactful route technology, thoroughly changed traditional professional route pattern based on single routing table based on stream, simultaneously also more flexible than the tactful route of general switch, be easier to realize user's request.
Description of drawings
Fig. 1 is a structured flowchart of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments workflow of the present invention is described in more detail.
As described in Figure 1, network processing unit comprises that stream parsing module 1, traffic classification module 2, stream distribution module 3, stream are searched module 4, flow database 5, stream update module 6, a module 7 circulates.
(1) network processing unit is received after the message, at first arrives stream parsing module 1 and handles.The main effect of stream parsing module 1 is according to the register design, extracts the field set in the message and they are joined together to form the key assignments of one 128 bit, offers traffic classification module 2 row message classifications; Hardware flow parsing module 1 can be able to from heading, extract 6 independently field be used for constituting key assignments, the length of each field is no more than 16 bytes, total field length is no more than 128 bits, if total field length is less than 128 bits, insufficient section is in the zero padding of position, the end, six following distribution of field can extracting:
For going into message,, can specify and from additional heading, specify extracting position to extract the field that is no more than 16 bytes if two layers of fronts have privately owned additional header; In three layers of head of message, can extract three fields;
In four layers of head of message, can extract two fields.
In the method, the information that additional header is extracted is not used, because the message that receives into from Ethernet all is a reference format.For the IP message, the field that extracts from three layers of head of message is: source IP, purpose IP, protocol type.The field that extracts from four layers of head of message is: source port, destination interface.
(2) according to key assignments, handle by traffic classification module 2, the main effect of traffic classification module 2 is according to collocation strategy, key assignments according to 128 bits, key assignments to 128 bits carries out CRC7 calculating, obtains one 7 bit value, and the list item of 128*9 bit is arranged as index search, obtain 9 bit values, offer stream distribution module 3 and determine to issue which thread to 3 uses of stream distribution module; Configured strategy can adopt following several mode:
According to user's network operating position, some IP can be routed on the different links, realize user's differential service.Simultaneously, can different business be routed to different links, realize professional differential service according to protocol type and port.
Resolve by carrying out the session service type, identify professional agreement and payload keyword.Applied business is mapped in the specific stream of a certain class, and distributes suitable traffic identifier (flowID), carry out label switched, realize the tactful route of dialogue-based type of service according to flow ID.
Wherein, the type of service of described stream identification as:
● the identification of HTTP service downloading
For normal web browsing session, the duration of a session can not surpass 3 minutes, and for a webpage, therefore each element can, can not exceed the service traffics of 3MB a session the inside carrying.
Therefore, for the HTTP business, as long as check the duration and the session data statistical conditions of its session, when:
Duration＞180s﹠amp; ﹠amp; In the time of exchanges data＞3MB (these parameters can flexible configuration), just can think that this http session belongs to file downloading service.
● the identification of BT service downloading
In the BT business, always can be before carrying out exchanges data, provide a place to contain the keyword of BitTorrent Protocol in 68,55,137 bytes of message, therefore, character string search is carried out in the place that this several byte offset address of message begins, if exist, can think that this session is the service traffics download of a BT.
After a session clearly is identified as BT, just can carry out traffic statistics, and, it be carried out bandwidth constraints according to pre-configured P2P bandwidth chahnel to them, prevent that it from engulfing a large amount of bandwidth resources.
● the identification of EDK service downloading
The identification of EDK business is comparatively simple, and every message port (no matter being source port or destination interface) equals 4242, perhaps greater than 4661 and less than 4665, can think the EDK business.
● the identification of ppStream service downloading
The realization of ppStream business and BT striking resemblances, just keyword difference.Its condition code keyword is " PSProtocol ".
● the passive type ftp business is downloaded identification
It is professional different that passive type FTP and the simple condition code of other use can be discerned.The service port of passive type FTP is by after having consulted inside 21 FTP control ports of standard, transmits again, and 20 ports that are different from the use standard are as the FTP data transmission port.
Concrete tracing process is:
Message to all 21 ports carries out character string search, seeks the control signaling field " Passive " of passive type FTP;
If there is this field, then FPDP is carried by this message, and the back has comprised " source port+destination interface " of data transmission channel the inside.
Wherein: the definite of flow ID can be:
Flow ID=source IP address+purpose IP address+source port number+destination slogan+protocol type+10*Servicetype+5*Key
ServiceType is the business type field in the ICP/IP protocol;
Key is the keyword that is hidden in the proprietary protocol in the conversation procedure, if do not have the keyword of proprietary protocol in the session then get 0.
In some cases, because static tactful route can't change according to the dynamical state of link-quality, cause link load to have evident difference, professional owing to be routed on the link by static policies such as a large amount of P2P, core business is routed on the high-quality high-quality link by strategy.When core business out of service or professional considerably less, and the P2P link is because the mass data transmission has caused serious congestion, just should adopt routing policy this moment based on the QoS quality optimization, do not influencing under the normal core business QoS quality prerequisite, the P2P business of part time priority is being routed on the high-quality link.
Tactful route based on the QoS quality optimization is distributed suitable traffic identifier according to QoS, sets up relevant stream list item.Wherein QoS is meant the whole QoS quality index of a certain conversation type; It is on last basis of once calculating qos value, according to new session QoS index, adjusts the QoS integral level of this conversation type.When quality of the conversation improved, qos value rose; When quality of the conversation descended, qos value descended.
QoS=QoS+5* call completing rate-time delay-packet loss-congestion ratio-unusual session
Time delay: be meant a session time delay (time delay is meant the two-way time of a session message);
Packet loss: the packet loss index that is the session message;
Call completing rate: be the whole successful ratio of setting up that connects of the type session;
Congestion ratio: be that congested ratio takes place the type session integrated communication process;
Unusual session: be meant the session proportion that originally meets normal course of communications in the type session or violated communication protocol;
(3) the main effect of stream distribution module 3 is some threads of selecting to be sent to traffic classification module 2 according to 9 bit values;
(4) after message is delivered to the thread of handling traffic classification module 2, search module 4 by stream and search processing;
(5) search flow database 5, whether exist fail to be sold at auction identical to exist with this message;
(6) if search successfully, then message gives the stream distribution module 3 processing;
(7) message is sent to a circulation module 7 through stream distribution module 3 and does further processing;
(8) if the 5th step was searched failure, illustrate that the stream list item of phase homogeneous turbulence is not also set up, give update module 6 and handle;
(9) stream update module 6 is carried out the upper-layer protocol parsing of message, if the user has disposed the tactful route of dialogue-based type of service, so for protocol type itself just determined applied business as ICMP, ARP agreement, the use agreement type field is as the application layer type of service; For the business with definite port such as Telnet, POP3, SMTP etc., by port identification application layer type of service; For the business of standard agreement such as H.323, agreement such as SIP, then by these agreements are resolved, finish determining of application layer type of service; For there not being standard agreement, but can from the payload keyword, parse business such as the business of type of service such as BitTorrent, a sudden peal of thunder, QQ, then detect the identification of finishing the application layer type of service by keyword.Set up relevant stream list item, deposit in the flow database, again execution in step (5).
Claims (8)
1. the method based on the tactful route that flows that realizes on network processing unit comprises the steps:
(1) behind the reception message, handled by the stream parsing module, this module is extracted and extract field formation key assignments from heading, offers the traffic classification module;
(2) the traffic classification module is handled key assignments according to collocation strategy;
(3) according to the result of traffic classification module, the stream distribution module determines message is sent to which thread of traffic classification module;
(4) after message is delivered to the thread of traffic classification module, search module, search processing by stream;
(5) search flow database, whether exist fail to be sold at auction identical to exist with this message;
(6) if search successfully, then message is given the stream distribution resume module;
(7) message is sent to a circulation module through the stream distribution module and does further processing;
(8) if the 5th step was searched failure, illustrate that the stream list item of phase homogeneous turbulence is not also set up, give update module and handle;
(9) the stream update module is set up relevant stream list item, deposits in the flow database, execution in step (5) again.
2. the method that on network processing unit, realizes according to claim 1 based on the tactful route that flows, it is characterized in that: the stream parsing module extracts the key assignments that a plurality of independently fields are used for constituting 128 bits in the described step (1) from heading, the length of each field is no more than 16 bytes, total field length is no more than 128 bits, if total field length is less than 128 bits, insufficient section is in the zero padding of position, the end.
3. the method based on the tactful route that flows that realizes on network processing unit according to claim 2 is characterized in that: in three layers of head of message, extract field: source IP, purpose IP, protocol type; In four layers of head of message, extract field: source port, destination interface.
4. the method that on network processing unit, realizes according to claim 1 and 2 based on the tactful route that flows, it is characterized in that: the collocation strategy in the described step (2) comprises:
(a) according to protocol type, IP address and port, different business is routed to different links, realize professional differential service;
(b) identify professional agreement and payload keyword, applied business is mapped in the specific stream of a certain class, and distribute traffic identifier, carry out label switched according to traffic identifier;
(c) out of service or professional considerably less when core business, and the P2P link has been because mass data transmission has caused serious congestion, and the P2P business of part time priority is routed on the high-quality link.
5. the method that on network processing unit, realizes according to claim 2 based on the tactful route that flows, it is characterized in that: the processing method of traffic classification module is in the described step (2): according to the key assignments of 128 bits, key assignments to 128 bits carries out CRC7 calculating, obtain one 7 bit value, as index search the list item of 128*9 bit is arranged, obtain 9 bit values that use to the stream distribution module.
6. the method that on network processing unit, realizes according to claim 1 and 2 based on the tactful route that flows, it is characterized in that: described step (9) stream update module is by identification message traffic type or connection type, traffic identifier is set, sets up relevant stream list item.
7. the method based on the tactful route that flows that realizes on network processing unit according to claim 4 is characterized in that: described traffic identifier flow ID=source IP address+purpose IP address+source port number+destination slogan+protocol type+10*Servicetype+5*Key
ServiceType is the business type field in the ICP/IP protocol;
Key is the keyword that is hidden in the proprietary protocol in the conversation procedure, then gets 0 as the keyword that does not have proprietary protocol in the session.
8. the method based on the tactful route that flows that realizes on network processing unit according to claim 4 is characterized in that: described QoS=QoS+5* call completing rate-time delay-packet loss-congestion ratio-unusual session.
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