CN1567828A - A method for performing speed limiting on data traffic by network processor - Google Patents
A method for performing speed limiting on data traffic by network processor Download PDFInfo
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- CN1567828A CN1567828A CN 03131953 CN03131953A CN1567828A CN 1567828 A CN1567828 A CN 1567828A CN 03131953 CN03131953 CN 03131953 CN 03131953 A CN03131953 A CN 03131953A CN 1567828 A CN1567828 A CN 1567828A
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Abstract
The invention relates to a method that network processor realizes limitation of data flow velocity, after the network processor receives data packet, extracting search key word in the data packet, matching user route table in the network processor, then according to service type parameters in the user record, identifying the service type of the data packet, adopting corresponding band-width control policy to make velocity limitation, thus realizing the band-width control to data packets of different service types. It can be applied to value-added service in need of velocity limitation like video order programme, etc, easy to implement and effective to limit velocity.
Description
Technical field
The present invention relates to wideband data communication in the communication field, be specifically related to the method that network processing unit is realized the data traffic rate limit.
Background technology
Along with popularizing and commercialization of Internet, the user group who provides the operator of IP access service to face is on the increase, and online value-added service type is also enriched constantly.When a large amount of voice and data service are transmitted in consolidated network, have only type of service is divided and user's the grade of service (QOS) rank is carried out stronger control, just can make operator provide the different grades of service (QOS) grade, have personalized broadband data services at different user.One of key technology that realizes these differentiated services is that type of service is classified, in the network equipment, adopt linear speed network processing unit structure, at different types of service, network processing unit adopts different Bandwidth Management strategies, and user data traffic is carried out effective speed limit.
Adopting network processing unit to carry out in the network equipment (as router, switch, access server) of Wire speed packet processing, the Leaky Bucket algorithm that mostly adopts carries out rate controlled now.The specific implementation of Leaky Bucket algorithm is, network processing unit is opened up certain data packet buffer as buffer queue, and this formation is called as funnel.When flank speed that the data traffic input rate surpass to be provided with, it is in the funnel that the bag that will exceed part is kept at buffer queue, and dispatch away it suitable afterwards opportunity.Leaky Bucket algorithm needs the network equipment will have bigger data buffer zone to carry out the buffer memory of packet, just can carry out effective linear speed.There is not big buffering area to do in the network equipment of buffer memory, the difficult realization of Leaky Bucket algorithm, the speed limit effect is bad, can not reach the requirement of value-added service.
Summary of the invention
The technical problem that the present invention solves has provided a kind of network processing unit carries out speed limit to the data flow method, according to simple professional sorting technique at the linear speed network processing unit flow chart of data processing in the express network, the packet input rate of fan-in network processor is carried out traffic type differentiation to be handled, adopt regularly strict lambda limiting process, with the foundation of the byte number that allows in the timing to pass through, realize control to output speed as data packet discarding.Overcome in the existing network, lacked the bandwidth control of packet,, can not provide the defective of effective value-added service in the application scenario that bandwidth is strict with.
Network processing unit of the present invention carries out the method for speed limit to the data flow, comprises following treatment step:
1) network processing unit is set up and the initialization routing table, and the content of described routing table comprises: search key, and the bandwidth Control Parameter is transmitted route, a preceding timing time, the preceding byte count value of once transmitting, present timing time and current forwarding byte count value;
2) set the sampling period, and with the threshold value of the byte number that allows in the described sampling period to pass through as speed limit;
3) network processing unit receives packet, and extracts the keyword in the corresponding step 1) in the packet, uses keyword to retrieve the bandwidth Control Parameter of this packet in described routing table, carries out bandwidth control if desired and changes step 4), otherwise transmit packet;
4) compare present timing time and the difference of a preceding timing time and the size in described sampling period, if greater than, then transmit packet, and the record real-time parameter; Otherwise commentaries on classics step 5);
5) whether judge current forwarding byte count value and the preceding difference of once transmitting the byte count value greater than threshold value, if less than, transmit packet, and the record real-time parameter; Otherwise packet loss is handled.
Keyword in the described step 1) is the purpose IP address of packet; Described step 3) specifically is the described routing table of purpose IP address search according to packet;
Bandwidth Control Parameter in the described step 1) is set in order to distinguish constant bit rate and Unspecified Bit Rate business, need carry out bandwidth control for constant bit rate, and the Unspecified Bit Rate business is not carried out bandwidth control;
Described step 4) and 5) the forwarding packet in, and the record real-time parameter specifically may further comprise the steps:
Give a preceding timing time with present timing time assignment, current forwarding byte count value assignment is given the preceding byte count value of once transmitting;
Transmit packet;
The data packet length value assignment that current forwarding byte count value is added forwarding is given current forwarding byte count value.
The present invention is after network processing unit is received packet, extract the search key in the data packet head, user's routing table in the matching network processor, again according to the type of service parameter in this user record, the type of service of recognition data bag, adopt the corresponding bandwidth control strategy to carry out speed limit and handle, thereby realize the different service types packet is carried out bandwidth control.
Adopt network processing unit of the present invention the data flow to be carried out the method for speed limit, on the BAS Broadband Access Server that adopts network processing unit, respectively 128K, 256K, 512K, 1M, 2M, 4M, 8M are tested with the FTP transmitting file, the result shows, be stabilized in about institute's speed limit rate, error is less.From the test the result, adopt this speed limit after, the image effect of video request program (VOD) is fine.Substantially satisfied the requirement of the value-added service (as video request program) that the needs speed limit is arranged.The present invention realizes that simply speed limit is effective, has reached the requirement of using.
Description of drawings
Fig. 1 is network processing unit of the present invention carries out speed limit to the data flow a method flow diagram.
Fig. 2 is the process chart of the preferred embodiment of the present invention.
Fig. 3 is the content and the form schematic diagram of the routing table that adopts in the embodiment of the invention.
Embodiment
Network processing unit of the present invention carries out the method for speed limit to the data flow, and the type of service classification is carried out in concrete application, and according to different types of service, network processing unit adopts different data packet discarding strategies, satisfies the speed limit requirement.
Type of service is divided into following two kinds: constant bit rate (CBR-Constant Bit Rate) is professional, Unspecified Bit Rate (UBR-Unspecified Bit Rate) business.
Constant bit rate (CBR) business
The CBR business is meant that those require to be maintained fixed the business of bandwidth in the whole connection cycle.Professional required bandwidth is described with parameter mean speed rate.Network should guarantee that data source can carry out data with rate at any time and send.Such as VOD service (VOD) just needs fixed-bandwidth smoothly to play.
Unspecified Bit Rate (UBR) business
Towards time delay and time delay are changed the non real-time application of not being strict with, the transmission rate of data source may change in time.
With reference to shown in Figure 1, the handling process of method for limiting speed of the present invention may further comprise the steps:
Step 1: define the concrete grade of service (QOS) parameter, distinguish above two kinds of type of service constant bit rates (CBR) business, Unspecified Bit Rate (UBR) business; And the professional Mean Speed of constant bit rate (CBR);
Step 2: the threshold value of definition sampling period and speed limit
Sampling period is set, and calculates and allow the byte number that passes through threshold value in the sampling period as speed limit.As speed limit 512kbps, the sampling period was made as 2 seconds, and the threshold value of speed limit is 512kbps * 2 ÷, 8 bytes so.
Step 3: according to type of service, QOS bandwidth Control Parameter is set, downloads in the routing table in the network processing unit.The statistics that comprises packet in the routing table, time parameter.Network processing unit is received packet, extracts search key, searches routing table.
Step 4:, find and the corresponding routing table in this address according to the destination address of packet.Referring to bandwidth Control Parameter in the route table items, if the Unspecified Bit Rate business is just directly transmitted packet, do not do speed limit and handle, jump to step 10.Otherwise be constant bit rate (CBR) business, carry out following speed limit and handle.
Step 5: read the timer numerical value timer of network processing unit, judge the current time and last time time interval of time greater than the time in sampling period?
Step 6: if the time interval is greater than the sampling period time value, so;
1) record current time and the current data packet byte number of having transmitted;
2) transmit packet;
3) this total amount of byte of transmitting of record;
4) jump to step 10.
Step 7: if current time and last time time interval of time was judged total amount of byte of this time transmitting so and last time transmitted data packet byte and counted difference less than the speed limit threshold value less than the sampling period time value?
Step 8: if total amount of byte of transmitting and last time transmitted data packet byte and counted difference this time less than the speed limit threshold value, so:
1) record current time and the current data packet byte number of having transmitted;
2) transmit packet;
3) this total amount of byte of transmitting of record.
4) jump to step 10.
Step 9: if total amount of byte of transmitting and last time transmitted data packet byte and counted difference this time: abandon this packet greater than the speed limit threshold value, so;
Step 10: jump to step 4, the processing procedure that circulation is above.
Below by specific embodiment and 2 pairs of the present invention's do descriptions in further detail in conjunction with the accompanying drawings.
In this specific embodiment, IP inserts the bandwidth FTP file in download that individual line subscriber (the IP address is 136.1.23.87) wishes to obtain 2M.Adopt this patent, we are provided with this kind type of service is constant bit rate (CBR) business, and network processing unit is that the packet of 136.1.23.87 carries out speed limit to purpose IP address.
Fig. 2 is a program flow diagram of the present invention, adopts the present invention, and we are provided with this kind type of service is constant bit rate (CBR) business, and network processing unit is that the packet of 136.1.23.87 carries out speed limit to purpose IP address.With reference to Fig. 2 program flow diagram.
Step 1: define the concrete grade of service (QOS) parameter and speed limit speed;
1).qos_type；
The qos_type value is distinguished above three kinds of type of service constant bit rates (CBR) business, Unspecified Bit Rate (UBR) business.Constant bit rate (CBR) business: qos_type=0x01; Unspecified Bit Rate (UBR) business: qos_type=0x02;
2)cbr_rate；
The cbr_rate value is determined the professional Mean Speed of constant bit rate (CBR); Cbr_rate value scope: (128,256,512,1024,2048,4096,8192), rate corresponding is from 128kbps to 8Mbps.
Step 2: the threshold value of definition sampling period and speed limit: a timer timer is arranged in the network processing unit, and sampling timer timer is used for the time processing.
This example adopts 1 second sampling period as speed limit, calculates fairly simplely like this, and speed limit is also more accurate.Judge as speed limit with the byte number that passes through in 1 second, speed limit threshold value bytes_threshold is set.If speed limit 512Kbps in other words, this user maximum stream flow that can flow through in 1 second is the 512k/8=64k byte so, the bytes_threshold=64k byte.
Speed limit is 2M now, so the bytes_threshold=2M/8=256k byte.
Step 3: network processing unit is set up and the initialization routing table:
In this example, the corresponding route table items of each search key, the content of this route table items comprises: search key, bandwidth Control Parameter (constant bit rate (CBR) business/Unspecified Bit Rate (UBR) business), transmit route, previous timing time former_time, the preceding byte count value former_bytes that once transmits, current time, current forwarding byte count value current_bytes.During initialization, the content of former_time=former_bytes=current_bytes=0. routing table and form see also accompanying drawing 3.
Step 4: network processing unit is received the IP packet, extracts purpose IP address, searches routing table.Referring to bandwidth Control Parameter in the route table items, the professional qos_type==1 of constant bit rate (CBR) whether? if not, forward step 7 to;
Step 5: read timer numerical value timer, judge that (timer-former_time) value was greater than 1 second? if greater than 1 second, then forward step 9 to;
Step 6: judge that whether (current_bytes-former_bytes) value is greater than speed limit thresholding bytes_threshold; If greater than, then forward step 8 to; If less than, then forward step 9 to.
Step 7: transmit packet; Forward step 4 to;
Step 8: abandon this packet, forward step 4 to;
Step 9: former_time=timer;
forme_bytes＝current_bytes；
Transmit packet;
This data packet length of current_bytes=current_bytes+ len;
Forward step 4 to;
Claims (4)
1. a network processing unit carries out the method for speed limit to the data flow, it is characterized in that described method comprises following treatment step:
1) network processing unit is set up and the initialization routing table, and the content of described routing table comprises: search key, and the bandwidth Control Parameter is transmitted route, a preceding timing time, the preceding byte count value of once transmitting, present timing time and current forwarding byte count value;
2) set the sampling period, and with the threshold value of the byte number that allows in the described sampling period to pass through as speed limit;
3) network processing unit receives packet, and extracts the keyword in the corresponding step 1) in the packet, uses keyword to retrieve the bandwidth Control Parameter of this packet in described routing table, carries out bandwidth control if desired and changes step 4), otherwise transmit packet;
4) compare present timing time and the difference of a preceding timing time and the size in described sampling period, if greater than, then transmit packet, and the record real-time parameter; Otherwise commentaries on classics step 5);
5) whether judge current forwarding byte count value and the preceding difference of once transmitting the byte count value greater than threshold value, if less than, transmit packet, and the record real-time parameter; Otherwise packet loss is handled.
2. network processing unit according to claim 1 carries out the method for speed limit to the data flow, it is characterized in that the keyword in the described step 1) is the purpose IP address of packet; Described step 3) specifically is the described routing table of purpose IP address search according to packet.
3. network processing unit according to claim 1 and 2 carries out the method for speed limit to the data flow, it is characterized in that, bandwidth Control Parameter in the described step 1) is set in order to distinguish constant bit rate and Unspecified Bit Rate business, need carry out bandwidth control for constant bit rate, the Unspecified Bit Rate business is not carried out bandwidth control.
4. network processing unit according to claim 1 and 2 carries out the method for speed limit to the data flow, it is characterized in that described step 4) and 5) in the forwarding packet, and the record real-time parameter specifically may further comprise the steps:
Give a preceding timing time with present timing time assignment, current forwarding byte count value assignment is given the preceding byte count value of once transmitting;
Transmit packet;
The data packet length value assignment that current forwarding byte count value is added forwarding is given current forwarding byte count value.
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