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CN1758625A - Method for classification processing message - Google Patents

Method for classification processing message Download PDF

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Publication number
CN1758625A
CN1758625A CNA2004100518055A CN200410051805A CN1758625A CN 1758625 A CN1758625 A CN 1758625A CN A2004100518055 A CNA2004100518055 A CN A2004100518055A CN 200410051805 A CN200410051805 A CN 200410051805A CN 1758625 A CN1758625 A CN 1758625A
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CN
China
Prior art keywords
message
rule
classified
judgment
port
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CNA2004100518055A
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Chinese (zh)
Other versions
CN100466594C (en
Inventor
熊怡
刘少伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Filing date
Publication date
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Priority to CNB2004100518055A priority Critical patent/CN100466594C/en
Publication of CN1758625A publication Critical patent/CN1758625A/en
Application granted granted Critical
Publication of CN100466594C publication Critical patent/CN100466594C/en
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    • H04M3/00—Automatic or semi-automatic exchanges
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    • H—ELECTRICITY
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    • H04W8/00—Network data management
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract

A method for classifying message includes setting up seek key value of message classification by applying a numbers of characteristic domains on message itself, adding zone bit in key value based on message judging condition in addition to said domains, setting zone bit in key value at relevant position according perception of said judging condition, matching message to corresponding rule item according to key value for finding out relevant action to execute so as to realize intelligent control of message flow rate.

Description

A kind of method that message is classified and handled
Technical field
The present invention relates to communication technical field, relate in particular to a kind of method that message is classified and handled.
Background technology
In router and other data communication products, in order to realize that different stream is carried out different processing, need be to message processings of classifying, abbreviation traffic classification.What industry was generally used classifies as standard 5 tuple streams, so-called 5 yuan, promptly from 5 property fields of IP (Internet protocol) message self, they are: the source port of destination interface, TCP or the UDP of IP destination address, IP source address, (load of IP message carrying) protocol type, TCP (transmission control protocol) or UDP (User Datagram Protoco (UDP)).The classification of 6 tuple streams is arranged among the RFC 3290, on the basis of 5 tuples, increased the DSCP territory (Diffserv codepoint, i.e. differentiated services coding) in the IP head.
Along with professional increasing on the increase of network traffics and the network, need carry out thinner classification and increase type of action flow, 5 yuan of group categories can not satisfy the demands.In some new business, such as: Netflow and NetStream, this two specific character is the function that message on the network is classified and added up, they have adopted the classification of 7 tuple streams.On the router of some producers also with VLAN ID (VLAN ID), TCP sync message sign, segmented message sign or the like feature as the classification element.
After the classification, to the different line identifiers that flows to, then the stream of different identification is taked different processing, this processing is called action.Traffic classification and action realize by ACL (Access Control List (ACL)) that in data communications equipment ACL comprises one group or the combination of organizing rule (rule) and action (Actions) more.Rule i.e. the property field of a stream, and for example: purpose IP address is that 2.2.2.2 can constitute a rule for the 1.1.1.1+ source address.Action generally comprises following type:
1) filter (fire compartment wall): the specific stream that comes out classifying carries out discard processing according to user's setting, can be used to abandon invalid packet or virus attack message.
2) be redirected (tactful route): the traffic classification specific circulation of coming out is dealt into next jumping (weak tactful route) that the interface of next jumping (weak tactful route) of appointment or appointment connects, the plank that perhaps is redirected to other carries out special processing, such as NAT (network address translation), GRE (Generic Routing Encapsulation), enter MPLS (multiprotocol label switching) and transmit or the like.
3) mark (Remark) again: the priority of the specific stream that traffic classification is come out all is set at the priority of appointment, can improve or reduce the priority of bag like this.Again mark has comprised the mark in TOS (COS) territory to the IP head, the 802.1p territory of VLAN (VLAN), the Exp territory of MPLS (multiprotocol label switching) etc.
4) sampling (Sampling): convection current is sampled, and heading and the data volume or the whole message of key with the bag in the stream duplicates according to a certain percentage, and delivers to corresponding equipment or plank is analyzed or other processing.
5) flow restriction CAR (Committed Access Rate): carry out bandwidth constraints according to user configured speed convection current, what surpass bandwidth can carry out discard processing.
But the element that the traffic classification method of prior art is classified just derives from message itself, and the element and the type of action of classification are limited, can't further carry out intelligence adjustment to business neatly like this, can't fully guarantee the reliability of system.Describe in the port art binding high priority message is treated to example below:
Port BindingBundling is with a plurality of ports of router or switch by configuration " binding " together, and as an interface use, flow is selected the path that will walk by hash algorithm in the port of these several bindings.As shown in Figure 1, be connected with link 2 these two links by link 1 between router-A and B, the router port that link 1,2 connects is a bundling port.Link 1,2 these two links generally all are connected different interface boards on router-A and router B, the purpose of doing like this is highly reliable in order to realize, in case an interface board goes wrong, another one can also send, if two mouths are on a plank, in case break down, link will all interrupt.
Under the normal condition, flow from the router-A to B and the flow from router B to A all transmit by two links by hash algorithm.In the message that transmits, high priority and low priority are arranged.High priority generally all is user's an important message, and perhaps the message of responsible consumer has a strong impact on causing to the user in case abandon.
Suppose that when link 1 breaks all flows will switch on the link 2, link 2 will take place congested this moment.If when the high priority message flow of link 1+ link 2 surpassed the band width in physical of link 2, high-priority traffic was with the situation that occurs abandoning.
When in the port art binding high priority message being handled, generally on link 1,2 corresponding port, the high-priority traffic configured bandwidth is guaranteed that configured bandwidth has two kinds of methods:
1) a kind of method is to get half of high-priority traffic, and then increases a surplus bandwidth is set.For example link 1,2 all is the link (being that bundle link is 200M) of 100M, the high priority message is the one total 80M of the direction from the router-A to B on link 1,2, so in the router-A side of link 1,2, half of getting high-priority traffic is 40M, and then increase a surplus, can dispose two ports like this high priority is guaranteed about each 50M.
2) another method is that two link corresponding port all are configured to greatest priority assurance bandwidth.Also be to use top example, will be on the equipment of router-A side, bandwidth of each self-configuring 80M all in the formation of 1,2 two ports of respective links.
When link 1 broke, all flows all switched on the link 2, method 1) will abandon the high-priority traffic of 30M; Method 2), can guarantee that high-priority traffic passes through in high-priority traffic during less than link capacity.But can only solve in the situation of high-priority traffic total amount less than link 2 flows, high-priority traffic greater than link 2 capacity situation under, still can packet loss.
Summary of the invention
Technical problem to be solved by this invention is: the element and the type of action that overcome the prior art traffic classification are limited, can't carry out the deficiency that intelligence is adjusted to business neatly, a kind of method that message is classified and handled is provided, thereby realizes professional intelligent control, improve the reliability of system.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:
This method that message is classified and handled may further comprise the steps: adopt the several features territory of message self to make up finding key value of message classification; The element that expansion is classified to message increases the element of message unique characteristics Rule of judgment in addition as message classification, and increase corresponding marker bit in described key assignments; Above-mentioned Rule of judgment is carried out perception, and the corresponding flag bit in key assignments carries out set, to corresponding regular list item, finds corresponding action and execution according to key value match, realizes the Based Intelligent Control to message flow.
Rule of judgment beyond the described message unique characteristics can be device-dependent Rule of judgment or the Rule of judgment relevant with the packet route feature, perhaps with the message Rule of judgment that it doesn't matter.Described Rule of judgment can be opened or close for port and interface, link is opened or close, agreement is opened or close, the equipment on the link or node is obstructed, transmission is overtime, environment temperature and humidity exceeds standard, whether the flow on certain port congested or certain rate of discharge super large whether.
Can also expand the action of described message classification, described action is adopted routing again, reduction or the priority that raises, is gone into different queue, filtration, speed limit, close certain interface or start traffic mirroring.
The flag bit of described Rule of judgment can only account for 1 bit in key assignments.Described Rule of judgment can be for comprising interval condition.Described regular list item can be Access Control List (ACL).
Can after the several features territory of adopting message self makes up finding key value of message classification, look into Port State Table, obtain the port status sign,, remove the matched rule list item again the part of this sign as key assignments.When the Port State Table of each interface board is made amendment, after the information of port reports master control borad by interface board, be issued to each interface board by master control borad again and make amendment, perhaps, directly revise by each interface board by being broadcast to each interface board in the interface board tape transport.
Beneficial effect of the present invention is: the present invention is by expanding the element and the action of classification, the element that message is classified no longer is a message its own characteristics (as 5 tuples, 7 tuples etc.), some are relevant with equipment, packet route is relevant even and the message Rule of judgment that it doesn't matter fully, also will be as the element of message classification.Element by the extended flow classification, by when condition takes place and do not take place, can carry out specific action to specific flow, make that the traffic classification function of data communications equipment is powerful more flexibly, can when changing appears in the uncorrelated condition of equipment, carry out intelligence adjustment to business.Make equipment more controlled, business is controlled more more flexible, has improved the reliability of system, and the present invention is highly suitable for fields such as NGN and IP Telecommunication Network and uses.
Description of drawings
Schematic network structure when Fig. 1 is Port BindingBundling;
Fig. 2 is existing traffic classification process chart;
Fig. 3 is a traffic classification process chart of the present invention;
Fig. 4 upgrades flow chart for a kind of PST of the present invention;
Fig. 5 upgrades flow chart for the another kind of PST of the present invention.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
Flow classification techniques is manual intervention, the most direct a kind of method that embodies people's instruction.Existing flow classification techniques, its principal character are that the element of traffic classification all derives from message self, such as 5 tuples or 6 tuples or more polynary group etc., all are to be that feature is classified with the part territory in the heading.Corresponding action also is based on the stream that such classification comes out carries out, and actual action has above-mentioned several classes of enumerating at present.In the present invention, the element and the action of classification are expanded, the element of classification will no longer just derive from message itself, the feature of some equipment, route characteristic or can be increased to wherein with the message feature that it doesn't matter fully; Simultaneously action is also expanded.By this expansion, make the traffic classification function of data communications equipment bring into play bigger effect at aspects such as improving system reliability, make ACL (Access Control List (ACL)) that bigger purposes and usage space are arranged simultaneously, thereby solve the problem of similar above-mentioned Port BindingBundling.
Among the present invention, the element and the action of classification are expanded, the feature of some equipment, route characteristic can be increased in the element of classification, simultaneously action are also expanded.As in example shown in Figure 1, can be with the element of " link 1 disconnected " this incident as a traffic classification, the flow of the incoming interface of correspondence is taked action, rule can be: IP SA1+ outlet is disconnected for RPR mouth+link 1.IP SA1 refers to the source IP address of an IP bag, and when " link 1 is disconnected " do not take place, the rule of configuration (rule) can not be matched like this, and corresponding action does not take place; When " link 1 is disconnected " takes place, can take corresponding action, guarantee the high priority message.
Traffic classification is to search Key (key assignments) by one to match a regular list item (ACL, i.e. Access Control List (ACL)), has indicated action in the list item.The Key of traffic classification is from each territory of message self at present, in the present invention, it is some fixing territories that the Key value will no longer be limited to, and can be some condition judgment, these conditions can be equipment selfs, also can be the information on the link of equipment perception, for example: particular device or node is obstructed, transmission is overtime, environment temperature and humidity exceeds standard, whether the flow on certain port is congested, certain rate of discharge super large or the like whether on port and interface Up/Down (On/Off) information, particular link Up/Down, certain protocol Up/Down, the link.After having increased these conditions; to carry out some specific actions (for example routing, reduction or the priority that raises, go into different queue, filter, carry out speed limit even close certain interface, start traffic mirroring or the like operation) again to corresponding flow; thereby make data communications equipment intelligence more, the function of finishing more complicated switching, protection, routing, filtration automatically and can't realizing more in the past.
In addition, the condition of traffic classification can also be that some comprise interval condition, and for example: the percentage that the flow of certain interface of equipment reaches also can be used as the condition of a traffic classification.In realization, this percentage can be divided into several intervals, such as 32～64 being intervals, more than 64 an interval, because traditional traffic classification Key searches the classification of support scope, thus also can mate, thus corresponding action found.For example dispose a rule: reach more than 80% at the port one outflow, corresponding action is: the flow of Ip source address 1.1.1.1 will send from port 2.In actual the realization, the measurement of port flow can wait by the use of outlet internal memory and reflect, this information can by with in the real-time all planks of the equipment that is broadcast to.Pass through setting in advance like this, can realize automatic flow shunting.
Port BindingBundling problem for example shown in Figure 1 just can obtain more perfectly solving by this broad sense traffic classification method of the present invention.At first a prerequisite is, in present DiffServ (differential service) system, the classification of flow has only defined 6 kinds at present, is coarseness relatively, so in fact in limit priority message EF, may also have the difference of different stage.Such as in existing equipment, the user has priority, but because the division of coarseness at present can only be told limited rank.Have 1 to 6 totally six kinds of customer flows as the data message, flow 1 priority is the highest, have control message (such as protocol massages) and high-priority data message in the flow 1, when fault takes place, the heavy congestion of network possibility, at this moment, need allow the control message pass through, and can lose some data messages, because the control message is in case lost, may cause more serious consequence, such as entire equipment or network paralysis etc.
In Fig. 1, can increase some rules at Way in, these rules are to the flow of high priority before the part, and when link 1 disconnected condition took place, it was set to low-priority traffic; When this condition does not take place, still be high-priority traffic; Perhaps partial discharge is wherein carried out the action of CAR (limited flow), come speed restriction, guarantee that so prior flow passes through.For example: the message of high priority is arranged on two links, and a kind of is video flow (supposition purpose IP address is DA1) 50M, and a kind of is high priority Internet user's flow (supposition purpose IP address D A2) 80M.The disposal ability 100M of single port has two mouths under the normal condition, the 200M bandwidth is so can guarantee.Bandwidth is total under the failure condition has only 100M (supposition link 1 is disconnected), because 50M+80M=130M＞100M, the high-priority traffic total amount is above link capacity like this.Because the flow of online abandons a part and can also surf the Net, only be that speed is slow, but video flow lose a bit and just can't see (image does not see), so the bandwidth to the high-priority traffic amount limits when a link breaks, increase a rule in the porch, specifically describe and be:
(1bit)+other bit (it is invalid to be set to) takes place in the Key:DA2+ fault
Action: CAR guarantees bandwidth 40M
Above-mentioned implication is for being the flow of DA2 for purpose IP address, when fault takes place, with flow restriction in 40M; If fault does not take place, then above-mentioned rule is inoperative.
In the specific implementation, link 1 disconnected this condition accounts for 1bit in Key.General Key value is a string number, such as 16 bytes (128Bit), when making up a Key, need the content that Key is relevant all put in.Comprise IP source address+destination address+tcp source port number+TCP destination slogan+protocol type+1 bit fail generation flag bit such as Key.Each a message will be filled in above-mentioned all information of message, constitutes a Key value, and the content item that makes up Key is reserved when transmitting.Can remove to search a regular list item (ACL) with this Key, the formation of regular list item has guaranteed that satisfactory Key can match correct rule.
The Rule of judgment that takes place or do not take place can only account for 1Bit in the Key value, these conditions, need be in realization to the perception of carrying out of condition, and notify the interface board that has disposed this regular list item (ACL).For example: as a condition, when port Down, master control borad is understood perception with certain port Down, and master control borad to the interface board event table, shows that event occurs with this down sending content.A table is arranged on each interface board, and each message all will be judged this table, if event occurs, then read more detailed table and know it is what generation, then in the position, respective flag position of Key, if when not having incident to take place, the flag bit of Key value correspondence is filled in default value.
In top example, be configuration like this during configuration:
IP source address any
IP destination address DA2
Tcp source port any
TCP destination slogan any
Protocol type any
1 bit fail generation flag bit fault takes place
Meaning of any be what it doesn't matter, promptly be indifferent to these values, guarantee that the IP destination address for the DA2+ fault takes place, then is certain to match above-mentioned regular list item if search algorithm.
Increase and do not increase link 1 disconnected this condition, in the flow process difference on professional (forwardings) plane as shown in Figures 2 and 3, PST wherein is Port State Table (Port Status Table), it is the table of an overall situation, each port has 1Bit, 0 expression Down, 1 expression Up.The present invention need look into the PST table earlier after adopting 5 tuples, 6 tuples or n tuple to make up the Key value, obtain the port status sign, and will indicate a part as the Key value, and then remove to look into rule list with Key, just carry out action if hit, if do not hit then normally send.The method of perception and concrete condition have relation, and PST table only is an example here, and be disconnected such as certain agreement, may be the protocol massages perception by this agreement, interface board is overheated be by the sensor senses on the plank or the like.
Two kinds of flow processs upgrading for control plane PST as shown in Figure 4 and Figure 5, the port that the port that link 1 connects is connected with link 2 may be to belong to two interface boards, after the information of port Down reports master control borad by interface board, being issued to each interface board by master control borad again revises PST or by being broadcast to each interface board in the interface board tape transport, directly revises PST by each interface board.Represent whether fault is whether port can work because make up that 1bit of Key value, whether being set to 1 is that fault takes place, and whether Up judges according to corresponding port in the PST table, so revised the PST table, could take place by indication fault in the Key value, just can match respective action.
The present invention makes that by the element and the action of classification are expanded the traffic classification function of data communications equipment is powerful more flexibly, can carry out intelligence adjustment to business when changing appears in the uncorrelated condition of equipment.Make equipment more controlled, business is controlled more more flexible.Traffic classification was to search to influence efficient with a difficult point of algorithm in the past, appearance along with TCAM devices such as (three-state content addressing memories), the performance issue of traffic classification is resolved, and TCAM can fixedly find list item in the incident by hardware, so performance is than higher.Like this, the broad sense traffic classification is highly suitable for fields application such as NGN and IP Telecommunication Network.
Those skilled in the art do not break away from essence of the present invention and spirit, can there be the various deformation scheme to realize the present invention, the above only is the preferable feasible embodiment of the present invention, be not so limit to interest field of the present invention, the equivalent structure that all utilizations specification of the present invention and accompanying drawing content are done changes, and all is contained within the interest field of the present invention.

Claims (8)

1, a kind of method that message is classified and handled is characterized in that, may further comprise the steps:
Adopt the several features territory of message self to make up finding key value of message classification;
The element that expansion is classified to message increases the element of message unique characteristics Rule of judgment in addition as message classification, and increase corresponding marker bit in described key assignments;
Above-mentioned Rule of judgment is carried out perception, and the corresponding flag bit in key assignments carries out set, to corresponding regular list item, finds corresponding action and execution according to key value match, realizes the Based Intelligent Control to message flow.
2, the method that message is classified and handled according to claim 1, it is characterized in that: the Rule of judgment beyond the described message unique characteristics is device-dependent Rule of judgment or the Rule of judgment relevant with the packet route feature, perhaps with the message Rule of judgment that it doesn't matter.
3, the method that message is classified and handled according to claim 2 is characterized in that: described Rule of judgment be that port and interface are opened or closed, link is opened or close, agreement is opened or close, the equipment on the link or node is obstructed, transmission is overtime, environment temperature and humidity exceeds standard, whether the flow on certain port congested or certain rate of discharge super large whether.
4, according to claim 1, the 2 or 3 described methods that message is classified and handled, it is characterized in that: also the action of described message classification is expanded, described action is adopted routing again, reduction or the priority that raises, is gone into different queue, filtration, speed limit, close certain interface or start traffic mirroring.
5, the method that message is classified and handled according to claim 4 is characterized in that: described Rule of judgment is to comprise interval condition.
6, the method that message is classified and handled according to claim 4, it is characterized in that: described regular list item is an Access Control List (ACL).
7, the method that message is classified and handled according to claim 4, it is characterized in that: after the several features territory of adopting message self makes up finding key value of message classification, look into Port State Table, obtain the port status sign, with the part of this sign, remove the matched rule list item again as key assignments.
8, the method that message is classified and handled according to claim 4, it is characterized in that: when the Port State Table of each interface board is made amendment, after the information of port reports master control borad by interface board, being issued to each interface board by master control borad again makes amendment, perhaps, directly revise by each interface board by being broadcast to each interface board in the interface board tape transport.
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