CN104468361A - Storing and searching method and device for TCAM with priorities - Google Patents
Storing and searching method and device for TCAM with priorities Download PDFInfo
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- CN104468361A CN104468361A CN201410777440.8A CN201410777440A CN104468361A CN 104468361 A CN104468361 A CN 104468361A CN 201410777440 A CN201410777440 A CN 201410777440A CN 104468361 A CN104468361 A CN 104468361A
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Abstract
The invention discloses a storing and searching method and device for a TCAM with priorities. The method includes the steps that the priorities of searching rules storied in TCAM table items are configured, when at least one searching rule needs to be added to the TCAM table items, added searching rules are stored in unoccupied table items of the TCAM, corresponding priorities are configured for the added searching rules, keywords in a message are matched with the searching rules in the TCAM table items, and if a plurality of table items are matched with the keywords simultaneously, actions corresponding to the searching rules with the highest priorities in the TCAM table items are executed. According to the method and device, searching and executing actions can be accurately executed, and the problems of complexity and error probability of software are solved to a large extent.
Description
Technical field
The present invention relates to network communication technology field, especially relate in a kind of network processing unit or its process chip and storing and lookup method and device with the TCAM of priority.
Background technology
TCAM (Ternary Content Addressable Memory, three-state content addressing memory), is a kind of memory based on binary content inquiry, is mainly used in classifying to message.TCAM is provided with some list items, and stores the action corresponding with TCAM list item in RAM (Random Access Memory, static random access memory).In the process of carrying out message classification, the keyword in a message and the list item in TCAM are mated, if there is the keyword match success in a list item and this message, then action corresponding to this list item is performed to this message.Due to the fast finding mechanism of TCAM, a lot of network chip manufacturer adopts TCAM usually when designing and storing matched rule at present, such as stores ACL(Access Control List, Access Control List (ACL)), route or other search rule.
If the mechanism of searching due to TCAM is the keyword match success had in a list item and this message, then perform relative list item action, when mating if multinomial, then perform the action being arranged in the most front rule correspondence simultaneously.If what store is routing rule, because route will meet the longest coupling, this is when issuing in routing rule to TCAM, rule the longest for mask is then needed to be placed on foremost, short for mask is put behind, and once add longer mask, the resettlement of original rule in TCAM likely can be caused, therefore need the resettlement algorithm of a set of complexity to carry out the resettlement of processing rule.
Prior art is moved by software processing rule, but need software consideration many factors, such as moves efficiency, room fragment compression arranges, considerably increase the complexity of software, and the continuous change of rule in TCAM can be caused due to resettlement and change, thus affect searching of rule.
Summary of the invention
The object of the invention is to the defect overcoming prior art, a kind of TCAM with priority is provided to store and lookup method and device, in TCAM search rule, add the strategy of priority match, to realize not needing software processing rule to move, the accuracy of searching and performing an action can be reached.
For achieving the above object, the present invention proposes following technical scheme: a kind of TCAM with priority stores and lookup method, the priority of each search rule stored in configuration TCAM list item, keyword in message is mated with the search rule in described TCAM list item, if when having multiple list item to mate simultaneously, then perform the action that the highest search rule of described TCAM list item medium priority is corresponding.
Preferably, the storage of described search rule in described TCAM list item is continuous print.
Preferably, the search rule of described TCAM list item is ACL or route.
Another technical scheme that the present invention proposes: a kind of TCAM with priority stores and lookup method, the priority of each search rule stored in configuration TCAM list item, if when increasing by least one search rule in described TCAM list item, then the described search rule increased is stored in the vacant list item of TCAM, and the priority that configuration is corresponding, keyword in message is mated with the search rule in described TCAM list item, if when having multiple list item to mate simultaneously, then perform the action that the highest search rule of described TCAM list item medium priority is corresponding.
Preferably, the storage of described search rule in described TCAM list item is continuous print.
Preferably, the search rule of described TCAM list item is ACL or route.
Another technical scheme that the present invention proposes: a kind of TCAM with priority stores and searches device, comprise network processing unit, TCAM list item and RAM memory, the search rule stored in described TCAM list item is configured with corresponding priority, network processing unit extracts keyword and inputs to described TCAM list item from message, described keyword contrasts with described TCAM list item, if there is multiple list item to mate simultaneously, then the address at described TCAM list item place the highest for the priority matched is inputed to described RAM memory, described network processing unit performs the corresponding action of the TCAM list item the highest with described priority that obtain from described RAM memory.
Preferably, if when increasing by least one search rule in described TCAM list item, then the described search rule increased is stored in the vacant list item of TCAM, and the priority that configuration is corresponding.
Preferably, the storage of described search rule in described TCAM list item is continuous print.
Preferably, the search rule of described TCAM list item is ACL or route.
Compared with prior art, the invention has the beneficial effects as follows: the present invention searches in mechanism at TCAM and adds priority concept, if there is multiple search rule to be matched in existing TCAM simultaneously, then can perform the action of the rule correspondence of first time coupling, and the present invention is owing to adding priority, if have multiple rule to match, then the rule action that execution priority is the highest simultaneously, the accuracy of searching and performing an action can be reached; In addition, in TCAM, increase storage search rule if existing, then need to be moved by software processing rule, and the present invention only need configure the preferential of search rule in TCAM list item, solves complexity and the error probability of software significantly.
Accompanying drawing explanation
Fig. 1 is the TCAM storage of the present invention with priority and the principle schematic of lookup method technical scheme one;
Fig. 2 is the schematic diagram of the present invention with the TCAM of priority;
Fig. 3 is the TCAM storage of the present invention with priority and the principle schematic of lookup method technical scheme two;
Fig. 4 is the principle schematic of existing TCAM route storage mechanism;
Fig. 5 is the principle schematic of the present invention with the TCAM route storage mechanism of priority;
Fig. 6 is that the present invention is with the TCAM storage of priority and the theory structure schematic diagram searching device.
Embodiment
Below in conjunction with accompanying drawing of the present invention, clear, complete description is carried out to the technical scheme of the embodiment of the present invention.
The disclosed TCAM with priority stores and lookup method.Shown in composition graphs 1 and Fig. 3, the priority of each search rule stored in configuration TCAM list item, as stored N bar search rule in TCAM list item, is respectively Rule 0, Rule 1 ... Rule N, configures corresponding priority to every bar Rule.The storage of search rule in TCAM list item is continuous print.
As shown in Figure 2, when if desired increasing by least one search rule in TCAM list item, then the search rule of increase is stored in the vacant list item of TCAM, and the priority that configuration is corresponding.
When adopting the present invention to carry out message classification, the keyword in message is mated with the search rule in TCAM list item, if when having multiple list item to mate simultaneously, then perform the action that the highest search rule of TCAM list item medium priority is corresponding.
The search rule of TCAM list item can be ACL or route or other search rule.
Be routing rule for what store in TCAM list item below, the present invention searched with priority TCAM, browsing process is described as follows:
Suppose to store 4 routes in TCAM, routing address is all 1.1.1.1, and mask is respectively 32,24,16,8, and they store in TCAM is continuous print.If need the route of a storage 1.1.1.1/25, if now adopt traditional TCAM, as shown in Figure 4, then needing mask is 24,16, and the entry of 8, toward moving down, leaves 1.1.1.1/25 in the position of 1.1.1.1/24.If it is 25,24 that the route storing a 1.1.1.1/26 more then needs mask, the entry of 16,8, toward moving down, leaves 1.1.1.1/26 in the position of 1.1.1.1/25.So just, the rule in TCAM can be moved frequently.
If adopt the TCAM with priority, as shown in Figure 5, only need to change priority corresponding to TCAM rule, as above example, if need the route of a storage 1.1.1.1/25, a needs finds an empty position in TCAM, and the priority arranging this route is 25, if need the route of a storage 1.1.1.1/26, in TCAM, in like manner look for the position that empty, and the priority arranging this route is 26.Do not need the rule in mobile TCAM like this, just can reach the accuracy of searching and performing an action.
The TCAM that the present invention is based on priority stores and lookup method, also correspondence discloses a kind of TCAM with priority storage and searches device, as shown in Figure 6, it comprises network processing unit NP, TCAM list item and RAM memory, the search rule stored in TCAM list item is configured with corresponding priority, network processing unit NP extracts keyword and inputs to TCAM list item from message, keyword contrasts with TCAM list item, if there is multiple list item to mate simultaneously, then the address at TCAM list item place the highest for the priority matched is inputed to RAM memory, network processing unit NP performs the corresponding action of the TCAM list item the highest with priority that obtain from RAM memory.
Technology contents of the present invention and technical characteristic have disclosed as above; but those of ordinary skill in the art still may do all replacement and the modification that do not deviate from spirit of the present invention based on teaching of the present invention and announcement; therefore; scope should be not limited to the content that embodiment discloses; and various do not deviate from replacement of the present invention and modification should be comprised, and contained by present patent application claim.
Claims (10)
1. the TCAM with priority stores and lookup method, it is characterized in that: the priority of each search rule stored in configuration TCAM list item, keyword in message is mated with the search rule in described TCAM list item, if when having multiple list item to mate simultaneously, then perform the action that the highest search rule of described TCAM list item medium priority is corresponding.
2. the TCAM with priority according to claim 1 stores and lookup method, and it is characterized in that, the storage of described search rule in described TCAM list item is continuous print.
3. the TCAM with priority according to claim 1 and 2 stores and lookup method, and it is characterized in that, the search rule of described TCAM list item is ACL or route.
4. the TCAM with priority stores and lookup method, it is characterized in that: the priority of each search rule stored in configuration TCAM list item, if when increasing by least one search rule in described TCAM list item, then the described search rule increased is stored in the vacant list item of TCAM, and the priority that configuration is corresponding, keyword in message is mated with the search rule in described TCAM list item, if when having multiple list item to mate simultaneously, then perform the action that the highest search rule of described TCAM list item medium priority is corresponding.
5. the TCAM with priority according to claim 4 stores and lookup method, and it is characterized in that, the storage of described search rule in described TCAM list item is continuous print.
6. the TCAM with priority according to claim 4 or 5 stores and lookup method, and it is characterized in that, the search rule of described TCAM list item is ACL or route.
7. the TCAM with priority stores and searches device, it is characterized in that: comprise network processing unit, TCAM list item and RAM memory, the search rule stored in described TCAM list item is configured with corresponding priority, network processing unit extracts keyword and inputs to described TCAM list item from message, described keyword contrasts with described TCAM list item, if there is multiple list item to mate simultaneously, then the address at described TCAM list item place the highest for the priority matched is inputed to described RAM memory, described network processing unit performs the corresponding action of the TCAM list item the highest with described priority that obtain from described RAM memory.
8. the TCAM with priority according to claim 7 stores and searches device, it is characterized in that, if when increasing by least one search rule in described TCAM list item, then the described search rule increased is stored in the vacant list item of TCAM, and the priority that configuration is corresponding.
9. the TCAM with priority according to claim 7 stores and searches device, and it is characterized in that, the storage of described search rule in described TCAM list item is continuous print.
10. the TCAM with priority according to claim 7 ~ 9 any one stores and searches device, and it is characterized in that, the search rule of described TCAM list item is ACL or route.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410777440.8A CN104468361A (en) | 2014-12-15 | 2014-12-15 | Storing and searching method and device for TCAM with priorities |
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| CN201410777440.8A CN104468361A (en) | 2014-12-15 | 2014-12-15 | Storing and searching method and device for TCAM with priorities |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106230791A (en) * | 2016-07-20 | 2016-12-14 | 杭州迪普科技有限公司 | A kind of method and apparatus of single business many strategies Rapid matching |
| CN106302174A (en) * | 2015-06-12 | 2017-01-04 | 中兴通讯股份有限公司 | A kind of method and device realizing route querying |
| CN108769045A (en) * | 2018-06-07 | 2018-11-06 | 深圳市风云实业有限公司 | Acl rule configuration method, device and the network equipment |
| CN109688126A (en) * | 2018-12-19 | 2019-04-26 | 迈普通信技术股份有限公司 | A kind of data processing method, the network equipment and computer readable storage medium |
| CN110191057A (en) * | 2019-03-19 | 2019-08-30 | 鹏城实验室 | Method for searching route and routing device |
| CN111131029A (en) * | 2019-12-03 | 2020-05-08 | 长沙理工大学 | High-energy-efficiency OpenFlow flow table lookup method supporting rule dependence |
| CN112311698A (en) * | 2020-09-28 | 2021-02-02 | 清华大学无锡应用技术研究院 | Method, device and storage medium for processing network data packet |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106302174A (en) * | 2015-06-12 | 2017-01-04 | 中兴通讯股份有限公司 | A kind of method and device realizing route querying |
| CN106230791A (en) * | 2016-07-20 | 2016-12-14 | 杭州迪普科技有限公司 | A kind of method and apparatus of single business many strategies Rapid matching |
| US10491636B2 (en) | 2016-07-20 | 2019-11-26 | Hangzhou Dptech Technologies Co., Ltd. | Managing security policy |
| CN108769045A (en) * | 2018-06-07 | 2018-11-06 | 深圳市风云实业有限公司 | Acl rule configuration method, device and the network equipment |
| CN108769045B (en) * | 2018-06-07 | 2020-09-29 | 深圳市风云实业有限公司 | ACL rule configuration method, device and network equipment |
| CN109688126A (en) * | 2018-12-19 | 2019-04-26 | 迈普通信技术股份有限公司 | A kind of data processing method, the network equipment and computer readable storage medium |
| CN109688126B (en) * | 2018-12-19 | 2021-08-17 | 迈普通信技术股份有限公司 | Data processing method, network equipment and computer readable storage medium |
| CN110191057A (en) * | 2019-03-19 | 2019-08-30 | 鹏城实验室 | Method for searching route and routing device |
| CN111131029A (en) * | 2019-12-03 | 2020-05-08 | 长沙理工大学 | High-energy-efficiency OpenFlow flow table lookup method supporting rule dependence |
| CN111131029B (en) * | 2019-12-03 | 2022-08-19 | 长沙理工大学 | High-energy-efficiency OpenFlow flow table searching method supporting rule dependence |
| CN112311698A (en) * | 2020-09-28 | 2021-02-02 | 清华大学无锡应用技术研究院 | Method, device and storage medium for processing network data packet |
| CN112311698B (en) * | 2020-09-28 | 2021-08-24 | 清华大学无锡应用技术研究院 | Method, device and storage medium for processing network data packet |
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