CN1553654A - Method for realizing average flow bearing by bound ports of network processor system - Google Patents
Method for realizing average flow bearing by bound ports of network processor system Download PDFInfo
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- CN1553654A CN1553654A CNA031383882A CN03138388A CN1553654A CN 1553654 A CN1553654 A CN 1553654A CN A031383882 A CNA031383882 A CN A031383882A CN 03138388 A CN03138388 A CN 03138388A CN 1553654 A CN1553654 A CN 1553654A
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Abstract
This invention discloses a method for implementing equally taking upon traffic in the port trunking of network processor system. As the active member port is non-integer power of 2, the steps of the method are: get characteristic value of the current data message, through Hashes operation gets the Hashes value that can mark the feature of the message; in multi numeric intervals formed after dispersion interval of data traffic Hashes value of the current active member ports numbers, looks up the numeric interval that Hashes value belongs to; according to the found numeric interval gets the members port index corresponding to the interval ; and send the current data message to the members port corresponding to the above members port index.
Description
Technical field
The present invention relates to the network communications technology, realize the method that flow is all carried on a shoulder pole in particularly a kind of network processor system Port BindingBundling.
Background technology
The Port BindingBundling function provides a plurality of Ethernet link is aggregated into a logical links, improves the method for link bandwidth, is a critical function of switch, router.The speed of all of the port in the binding group should be identical.Port BindingBundling should be realized the even distribution of data traffic in the binding group, and when certain port in the binding group lost efficacy, flow should evenly switch on other ports of binding group automatically.
When message sent through bond ports, an outbound port need be selected by system in the binding group.The result who selects should satisfy 2 following requirements:
(1) same stream (the application-specific data message between particular source and specific purpose) should send from same port.Can guarantee the order of same flow data frame like this, this is necessary under layer 2-switched local area network (LAN) situation, because the local area network communication program generally is not consider that Frame is out of order.Can be mapped to by characteristic value on the port sequence number and realize the identification data frame.
(2) should guarantee the equilibrium of each port flow.According to current port number, data flow is distributed on each port uniformly.
System adopts hardware to realize Port BindingBundling (adopting ASIC to realize) more more at present, and the method that its flow is all carried on a shoulder pole is:
(1) according to feature (source MAC, the target MAC (Media Access Control) address of message; Source IP address, purpose IP address; The perhaps combination of source and destination), generate a characteristic value X.
(2) according to port number n available in the current binding group, characteristic value X is carried out modulo operation, obtain port sequence number i=X%n.
(3) choosing corresponding ports according to the port sequence number sends.
Because existing flow is all carried on a shoulder pole algorithm and is subjected to hardware constraints, only when 2 integral number power port number, promptly port number is: 2,4,8 o'clock effects are better for the effect of sharing, and can realize the even distribution of each port flow this moment.But certain port in the binding group lost efficacy, and made that it is even that flow just can not keep when Number of Available/Faulty Ports no longer was 2 integral number power.This is because digital system is used 2 systems, and can only carry out the result of integer arithmetic.When for example 2bits was as the hashed value after with source MAC, the fluxion that 100 stream is got at 3 ports was: 25/50/25, and reasonably distribution should be 34/33/33, the poor effect of visible traffic sharing this moment.The bond ports traffic sharing is bad, can cause the waste of bandwidth: certain port causes packet loss above band width in physical on the one hand, and other port flows are very little.
Summary of the invention
The object of the present invention is to provide and realize the method that flow is all carried on a shoulder pole in a kind of network processor system Port BindingBundling,, share effect to obtain optimal flow rate by adopting different port selecting methods according to current Number of Available/Faulty Ports.
Technical scheme one of the present invention:
Realize the method that flow is all carried on a shoulder pole in a kind of network processor system Port BindingBundling, described Port BindingBundling is to aggregate into a binding group by the identical a plurality of member ports of physical characteristic, distribute data message according to the following steps when the member port number of current active in the described binding group is 2 irintegral number power:
A, obtain the characteristic value of current data message, operation obtains identifying the cryptographic Hash of this message characteristic through Hash;
B, by current active member port base this etc. between the dispersion area of branch data flow cryptographic Hash in the formed a plurality of intervals in back, search the interval under the cryptographic Hash of current data message;
The interval that C, basis find obtains the member port index of this interval correspondence; And
D, current data message is sent to the pairing member port of described member port index.
According to technique scheme:
Distribute data message according to the following steps when the member port number of current active is 2 integral number power in the described binding group:
Obtain the characteristic value of current data message, operation obtains identifying the cryptographic Hash of this message characteristic through Hash;
With active port number in the binding group subtract 1 and with the cryptographic Hash of current data message carry out arithmetic " with ", obtain selected member's port index; And
Current data message is sent to the pairing member port of described selected member's port index.
Distribute data stream according to the following steps also when the member port number of current active is 2 integral number power in the described binding group:
Allotment message according to the following steps when movable member port number is 2 integral number power in the described binding group:
Obtain the characteristic value of current data message, operation obtains identifying the cryptographic Hash of this message characteristic through Hash;
Member port number with activity carries out modulo operation to the cryptographic Hash of current data message, obtains selected member's port index; And
Current data message is sent to the pairing member port of described selected member's port index.
Looking into from a plurality of intervals under the data flow characteristic value adopts dichotomy to search when interval.
The characteristic value of data message is the one or more of combination of source MAC, target MAC (Media Access Control) address, source IP address, purpose IP address, IP port numbers and MPLS label.
Technical scheme two of the present invention:
Realize the method that flow is all carried on a shoulder pole in a kind of network processor system Port BindingBundling, described Port BindingBundling is to aggregate into a binding group by the identical a plurality of member ports of physical characteristic, distribute data message according to the following steps when the member port number of current active in the described binding group is 2 integral number power:
Obtain the characteristic value of current data message, operation obtains identifying the cryptographic Hash of this message characteristic through Hash;
With active port number in the binding group subtract 1 and with the cryptographic Hash of current data message carry out arithmetic " with ", obtain selected member's port index; And
Current data message is sent to the pairing member port of described selected member's port index.
When the present invention's member port number in the binding group is 2 noninteger power, data message is disperseed in the span of its cryptographic Hash equably, and span is waited the dispense flow rate of assigning to substantially according to the member port number of current active, thereby can be more even, dynamically data flow is distributed on each member port, thereby can really guarantee the equilibrium of each member port flow in the binding group.
Description of drawings
Fig. 1 is prior art middle port binding traffic sharing schematic diagram;
Fig. 2 is sent to the schematic diagram of bond ports for data message of the present invention;
The flow chart that Fig. 3, Fig. 5 and Fig. 6 all carry on a shoulder pole for flow of the present invention;
Fig. 4 for the present invention by binary search port index schematic diagram.
Embodiment
Port BindingBundling is to aggregate into a binding group by the identical a plurality of member ports of physical characteristic, and member port is a physical port, and its index is since 0.Consulting shown in Figure 2ly, at switch, is example with the two layer message, after message enters from certain port, search Target Board TB and the target port TP that the MAC table obtains outbound port at source interface plate SB by target MAC (Media Access Control) address, after handling, message is sent to Target Board TB through web plate.Target Board TB learns that according to the attribute list of target port TP this target port TP is a bond ports.Network processing unit is that 2 integral number power or non-integer are divided equally the flow of data message according to the member port number of current active in the bond ports.
It is the stream of all stream boil down to somes by Hash (hash) algorithm that the flow of data message is all carried on a shoulder pole, this number is by total number of bits decision of the cryptographic Hash of data flow, get 9 bits as cryptographic Hash, then, 512 streams are evenly shared just realized evenly sharing of all streams then all stream 512 streams of boil down to (9 powers of 2).
Consult Fig. 3, carry out following step when the member port number of current active is 2 irintegral number power (promptly 3,5,6, or 7 etc.) in bond ports.Wherein the active port number is 1 o'clock, selected port index=0.
Step 10: obtain the characteristic value of current data message, operation obtains identifying the cryptographic Hash of this message characteristic through Hash.
The characteristic value of data message is the one or more of combination of source MAC, target MAC (Media Access Control) address, source IP address, purpose IP address, IP port numbers and MPLS label (label of multi-protocol label exchange message).
In the present embodiment, for two layer message, use the source MAC of data flow and the cryptographic Hash that target MAC (Media Access Control) address generates identification data stream; For three-tier message, use the source IP address of data flow and the cryptographic Hash that purpose IP address generates identification data stream.
Step 20: between by the dispersion area of this grade of current active member port base branch data flow cryptographic Hash, in the formed a plurality of intervals in back, search the affiliated interval of cryptographic Hash of current data message.
Total bit number difference of the characteristic value of data flow (cryptographic Hash) is also different between the dispersion area of its characteristic value.With basic five equilibrium between the dispersion area, form a plurality of intervals by the port number of current active in the binding group, wherein the member port index of the corresponding activity of each interval.Between all these different dispersion areas by behind the basic five equilibrium, the corresponding relation of interval and member port index can generate and be stored in switch or the router in advance to be inquired about when transmitting data message, can carry out index by active members port number etc. during inquiry.
Search interval and adopt dichotomy to carry out, also can adopt other lookup method.
Step 30: the member port index that obtains this interval correspondence according to the interval that finds.
Step 40: the member port that current data message is sent to described member port index correspondence.
Getting 9 bits with cryptographic Hash (hashed) is that example describes.The characteristic value of data flow is distributed to [0--511] (2 behind hash
9) between.If the current active port number is 7 in the binding group, and adopt binary search, consult Fig. 4.
Hash (hashed) value is 511 to the maximum, is divided into 7 five equilibriums substantially, and then separation is respectively 0,73,146,219,292,365,438,511 (maximums of 9 bits).So just formed 7 intervals: [0,73], (73,146], (146,219], (219,292], (292,365], (365,438], (438,511], wherein " () " expression does not comprise boundary value, and " [] " expression comprises boundary value.The size in each interval is: 74,73,73,73,73,73,73.
Like this, just total flow has been divided into basic uniform 7 five equilibriums, a member port index of each interval unique corresponding binding group, the message that the hashed value is dropped on respective bins sends to corresponding port, thus the equilibrium that realizes flow is shared.(when cryptographic Hash can be divided exactly by the active members port number, then belong to five equilibrium.)
The binary search flow process is as follows:
After obtaining the cryptographic Hash value of data message, at first compare hashed value and median 219.If greater than, just continue in the right half-court relatively; If less than, then continue relatively in the left half-court.Make in the same way, fall into the interval at its place, obtain the member port index of this interval correspondence, and then obtain the outbound port of this data message up to the hashed value.
From on can find out that the fluxion ratio of sharing on each port during 7 ports is 74/73/73/73/73/73/73, it is fine as seen to share effect.
Can carry out flow by following two kinds of methods when the member port number of current active is 2 integral number power (promptly 2,4, or 8 etc.) in bond ports all carries on a shoulder pole.
Consult Fig. 5, its process is as follows:
Step 100: obtain the characteristic value of current data message, operation obtains identifying the cryptographic Hash of this message characteristic through Hash.
Step 110: active port number in the binding group is subtracted 1 and carry out logical with the cryptographic Hash of current data message, obtain selected member's port index.
Step 120: current data message is sent to the pairing member port of described selected member's port index.
Consult Fig. 6, its process is as follows:
Step 200: obtain the characteristic value of current data message, operation obtains identifying the cryptographic Hash of this message characteristic through Hash.
Step 210: with movable member port number the cryptographic Hash of current data message is carried out modulo operation, obtain selected member's port index.
Step 220: current data message is sent to the pairing member port of described selected member's port index.
In the present invention, the member port data in the binding group are can 2～8.The cryptographic Hash X span of data flow is: 0＜=X＜216.
Claims (10)
1, realizes the method that flow is all carried on a shoulder pole in a kind of network processor system Port BindingBundling, described Port BindingBundling is to aggregate into a binding group by the identical a plurality of member ports of physical characteristic, distribute data message according to the following steps when the member port number that it is characterized in that current active in the described binding group is 2 irintegral number power:
A, obtain the characteristic value of current data message, operation obtains identifying the cryptographic Hash of this message characteristic through Hash;
B, by current active member port base this etc. between the dispersion area of branch data flow cryptographic Hash in the formed a plurality of intervals in back, search the interval under the cryptographic Hash of current data message;
The interval that C, basis find obtains the member port index of this interval correspondence; And
D, current data message is sent to the pairing member port of described member port index.
Distribute data message according to the following steps when 2, the method for claim 1, the member port number that it is characterized in that current active in the described binding group are 2 integral number power:
Obtain the characteristic value of current data message, operation obtains identifying the cryptographic Hash of this message characteristic through Hash;
With active port number in the binding group subtract 1 and with the cryptographic Hash of current data message carry out arithmetic " with ", obtain selected member's port index; And
Current data message is sent to the pairing member port of described selected member's port index.
Allotment message according to the following steps when 3, the method for claim 1, the member port number that it is characterized in that current active in the described binding group are 2 integral number power:
Obtain the characteristic value of current data message, operation obtains identifying the cryptographic Hash of this message characteristic through Hash;
Member port number with activity carries out modulo operation to the cryptographic Hash of current data message, obtains selected member's port index; And
Current data message is sent to the pairing member port of described selected member's port index.
4, the method for claim 1 is characterized in that adopting among the step B dichotomy to search.
As the arbitrary described method of claim 1 to 4, it is characterized in that 5, the member port index is since 0, selected member's port index value gets 0 when member port number movable in the described binding group is 1.
As the arbitrary described method of claim 1 to 4, it is characterized in that 6, the characteristic value of data message is the one or more of combination of source MAC, target MAC (Media Access Control) address, source IP address, purpose IP address, IP port numbers and MPLS label.
7, the method for claim 1 is characterized in that, the member port data in the described binding group are 2～8.
8, the method for claim 1 is characterized in that, the span of the cryptographic Hash of described data flow is more than or equal to 0 and less than 2^16.
9, as claim 1,7 or 8 described methods, it is characterized in that, between each dispersion area under different active members port numbers formed multiple corresponding relation preserve in advance.
10, realize the method that flow is all carried on a shoulder pole in a kind of network processor system Port BindingBundling, described Port BindingBundling is to aggregate into a binding group by the identical a plurality of member ports of physical characteristic, distribute data message according to the following steps when the member port number that it is characterized in that current active in the described binding group is 2 integral number power:
Obtain the characteristic value of current data message, operation obtains identifying the cryptographic Hash of this message characteristic through Hash;
With active port number in the binding group subtract 1 and with the cryptographic Hash of current data message carry out arithmetic " with ", obtain selected member's port index; And
Current data message is sent to the pairing member port of described selected member's port index.
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