CN102316012A - Method for realizing Internet protocol (IP) express forwarding and three-layer forwarding equipment - Google Patents
Method for realizing Internet protocol (IP) express forwarding and three-layer forwarding equipment Download PDFInfo
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Abstract
The invention provides a method for realizing Internet protocol (IP) express forwarding and three-layer forwarding equipment, wherein the method comprises the following steps of: receiving an IP message of a data stream, querying cache table entries in an enter direction and cache table entries in an exit direction successively, and processing the IP message according to a query result; when the process information of the enter direction and the exit direction aiming at the data stream cannot be queried, querying a basic table entry which is saved in advance so as to acquire the process information of the enter direction and the exit direction aiming at the data stream, then processing the IP message according to the acquired information and storing the acquired information into the cache table entries in the enter direction and the cache table entries in the exit direction. By the method, the IP express forwarding of the data stream processed by quality of service (QOS) can be realized.
Description
Technical field
The present invention relates to IP changes technical field soon, relates in particular to fast method and the three layers of forwarding unit that change of a kind of IP of realization.
Background technology
The thinking of quickening to handle based on cache memory (Cache) is widely used in computer realm, comprises the hardware and software field.Its basic ideas are: for flow process first, with this first flow process handle based on basic list item, and set up corresponding C ache list item; For non-flow process first, quicken to handle based on the Cache list item of setting up before.When basic contents in table changed, it is invalid that the Cache list item of correspondence is changed to, and handling process switches back to flow process first.
Three layers of forwarding unit also can be used the above-mentioned thinking of quickening to handle based on Cache when transmitting the IP message, realize the quick forwarding to the IP message, and this mode is called IP changes soon.
Carry out the fast mode sketch map that changes of IP like Fig. 1 for three layers of forwarding unit in the prior art.In three layers of forwarding unit, preserved basic list item such as forwarding information table (FIB), Inbound traffic table and outgoing direction traffic table in advance.When three layers of forwarding unit are received the IP message of a data flow, at first inquire about the Cache list item, judge whether to inquire Query Result to this data flow; If inquiry less than, then the basic list item preserved in advance of inquiry generates the Query Result to this data flow, according to this Query Result the message of this data flow is handled, and this Query Result is kept in the Cache list item; If can inquire, then this IP message is handled according to this Query Result.In actual process, when the IP that receives a data flow reported for the first time literary composition, three layers of forwarding unit were searched basic list item, generated the Query Result to this data flow, and Query Result is kept in the Cache list item; When the non-IP that receives this data flow reported for the first time literary composition, three layers of forwarding unit were directly inquired about the Cache list item.Obviously, directly inquire about the Cache list item and want beguine more quick, therefore, adopt this mode can realize quick forwarding the IP message according to basic list item generated query result.
Some business (for example PBR, Netstream, QOS) can be handled based on IP precedence during IP transmitted, and IP precedence adopts COS (TOS, the Type of Service) territory in the IP message to carry.For making IP change the business in tenaculum TOS territory soon; IP is fast, and the Cache list item organizational form of changeing can be IP five-tuple+TOS; That is: when the IP that receives a data flow reports for the first time literary composition,, generate the Query Result that is directed against this data flow based on this IP report for the first time IP five-tuple (comprising purpose IP, source IP, destination interface, source port, protocol number) and the basic list item of TOS information inquiry of literary composition; According to Query Result this IP literary composition of reporting for the first time is handled, and Query Result is kept in the Cache list item; Wherein, the Cache list item includes interface, IP five-tuple, TOS, professional Cache information, outgoing interface, the first-class information of link layer, and is as shown in table 1 below; When the non-IP that receives a data flow reports for the first time literary composition,, this non-IP literary composition of reporting for the first time is handled according to Query Result based on this non-IP report for the first time the IP five-tuple and the TOS information inquiry Cache list item of literary composition.
Table 1---based on the Cache list item of IP five-tuple+TOS
Said method can go wrong in some cases, as, arrange access rate (CAR for Inbound; What Committed Access Rate) configuration was painted and painted is the data flow in TOS territory; Getting into a data flow of forwarding unit, is a data flow when IP Inbound Business Processing, but carries out can becoming many data flow after QOS handles at the IP outgoing direction; This is because QOS processing meeting is carried out paintedly according to CAR result, promptly gives different values to TOS.For example, the QOS processing is carried out painted to the data flow shown in the following table 2, and painted result is relevant with the flow rate of data flow; When flow rate surpasses 1Mbps, be 6 with the TOS assignment of data flow; When flow rate is no more than 1Mbps, be 7 with the TOS assignment of data flow.
| Purpose IP | Source IP | Destination interface | Source port | Protocol number | ?TOS |
| 2.2.2.2 | 3.3.3.3 | 23 | 9881 | 6 | 1 |
1 data flow of table 2---Inbound
After Inbound QOS processing, the data flow shown in the table 2 is converted into 2 data flow shown in the following table 3.
| Purpose IP | Source IP | Destination interface | Source port | Protocol number | ?TOS |
| 2.2.2.2 | 3.3.3.3 | 23 | 9881 | 6 | ?6 |
| 2.2.2.2 | 3.3.3.3 | 23 | 9881 | 6 | ?7 |
Table 3---through 2 data flow after the QOS processing
Thus it is clear that, because through after the QOS processing, a data flow can be converted into many data flow; And the Cache list item has only been preserved the relevant information of handling a preceding data flow to QOS; So, many data flow after QOS handles just can't be searched the Cache list item, just can't realize that also IP changes soon.
Summary of the invention
The invention provides the fast method of changeing of a kind of IP of realization, can realize the IP of the data flow handled through QOS is changeed soon.
The present invention also provides a kind of IP of realization fast three layers of forwarding unit that change, and can realize changes the IP of the data flow handled through QOS soon.
Technical scheme of the present invention is achieved in that
A kind of fast method of changeing of IP that realizes comprises:
The IP message of A, receiving data stream; IP five-tuple, Inbound TOS information and incoming interface inquiry Inbound Cache list item according to this IP message; When the Inbound process information that inquires to this data flow; According to this Inbound process information this IP message is carried out the Inbound Business Processing, and from this Inbound process information, obtain the outgoing interface of this IP message, continue execution in step B; When inquiry less than to the Inbound process information of this data flow the time; The basic list item that inquiry is preserved in advance; Obtain Inbound process information, this IP message is carried out the Inbound Business Processing, from this Inbound process information, obtain the outgoing interface of this IP message according to this Inbound process information to this data flow; And this Inbound process information is saved in the Inbound Cache list item, continue execution in step B;
B, the IP five-tuple according to this IP message, outgoing direction TOS information and outgoing interface inquire direction Cache list item, when the outgoing direction process information that inquires to this data flow, according to this outgoing direction process information this IP message are carried out the outgoing direction Business Processing; When inquiry less than to the outgoing direction process information of this data flow the time; The basic list item that inquiry is preserved in advance; Obtain outgoing direction process information to this data flow; According to this outgoing direction process information this IP message is carried out the outgoing direction Business Processing, and this outgoing direction process information is saved in the outgoing direction Cache list item.
A kind of fast three layers of forwarding unit that change of IP of realizing comprise:
First enquiry module is used for when receiving the IP message of data flow, according to IP five-tuple, Inbound TOS information and the incoming interface inquiry Inbound Cache list item of this IP message;
First processing module; Be used for when first enquiry module inquires the Inbound process information to this data flow; According to this Inbound process information this IP message is carried out the Inbound Business Processing; And from this Inbound process information, obtain the outgoing interface of this IP message, notify second enquiry module with the outgoing interface of this IP message;
The first list item maintenance module; Be used for when first enquiry module inquiry less than to the Inbound process information of this data flow the time; The basic list item that inquiry is preserved in advance obtains the Inbound process information to this data flow, according to this Inbound process information this IP message is carried out the Inbound Business Processing; From this Inbound process information, obtain the outgoing interface of this IP message and notify second enquiry module, and this Inbound process information is saved in the Inbound Cache list item;
Second enquiry module is used for IP five-tuple, outgoing direction TOS information and outgoing interface according to this IP message, inquires direction Cache list item;
Second processing module is used for when second enquiry module inquires the outgoing direction process information to this data flow, according to this outgoing direction process information this IP message being carried out the outgoing direction Business Processing;
The second list item maintenance module; Be used for when second enquiry module inquiry less than to the outgoing direction process information of this data flow the time; The basic list item that inquiry is preserved in advance; Obtain outgoing direction process information, according to this outgoing direction process information this IP message is carried out the outgoing direction Business Processing, and this outgoing direction process information is saved in the outgoing direction Cache list item to this data flow.
It is thus clear that; Fast method and the three layers of forwarding unit that change of the realization IP that the present invention proposes; Set up 2 Cache list items to a data flow, include direction Cache list item and outgoing direction Cache list item, when receiving the IP message of a data flow; Inquire about Inbound Cache list item and outgoing direction Cache list item successively, this IP message is handled according to Query Result; If inquiry is less than Inbound Cache list item or outgoing direction Cache list item; Then inquire about the basic list item of preserving in advance; According to Query Result this IP message is handled; And Query Result is kept in Inbound Cache list item or the outgoing direction Cache list item, so that three layers of forwarding unit uses when transmitting the follow-up IP message of this data flow.In this way, realized the IP of the data flow handled through QOS is changeed soon.
Description of drawings
Fig. 1 carries out the fast mode sketch map that changes of IP for three layers of forwarding unit in the prior art;
Fig. 2 realizes the fast method flow diagram that changes of IP for the present invention;
Fig. 3 carries out the fast mode sketch map that changes of IP for three layers of forwarding unit in the prior art;
Fig. 4 realizes the structural representation of the fast three layers of forwarding unit that change of IP for the present invention.
Embodiment
The present invention proposes the fast method of changeing of a kind of IP of realization, and this method is used for the IP of the data flow of handling through QOS is changeed soon.Realize the fast method flow diagram that changes of IP like Fig. 2 for the present invention, this method comprises:
Step 201: the IP message of receiving data stream, according to the IP five-tuple of this IP message, Inbound TOS information and incoming interface inquiry Inbound Cache list item, when the Inbound process information that inquires to this data flow, execution in step 202; When inquiry less than to the Inbound process information of this data flow the time, execution in step 203;
Step 202: the Inbound process information according to this data flow carries out the Inbound Business Processing to this IP message, and from this Inbound process information, obtains the outgoing interface of this IP message, continues execution in step 204;
Step 203: the basic list item that inquiry is preserved in advance; Obtain Inbound process information to this data flow; According to this Inbound process information this IP message is carried out the Inbound Business Processing; From this Inbound process information, obtain the outgoing interface of this IP message, and this Inbound process information is saved in the Inbound Cache list item, continue execution in step 204;
Step 204: IP five-tuple, outgoing direction TOS information and outgoing interface according to this IP message inquire direction Cache list item, when the outgoing direction process information that inquires to this data flow, and execution in step 205; When inquiry less than to the outgoing direction process information of this data flow the time, execution in step 206;
Step 205: the outgoing direction process information according to this data flow carries out the outgoing direction Business Processing to this IP message, finishes current flow process;
Step 206: the basic list item that inquiry is preserved in advance, obtain outgoing direction process information to this data flow, according to this outgoing direction process information this IP message is carried out the outgoing direction Business Processing, and this outgoing direction process information is saved in the outgoing direction Cache list item.
Carry out the fast mode sketch map that changes of IP like Fig. 3 for three layers of forwarding unit in the prior art.Three layers of forwarding unit are set up Inbound Cache list item and outgoing direction Cache list item according to basic list item, realize the IP of data flow is changeed soon.
Below lifting concrete embodiment introduces in detail.
In the present embodiment, be that example is introduced with the data flow shown in the table 2.For the different IP message of this data flow, the mode of processing is different, below divides various situation to introduce respectively.
First kind:
When the IP that receives this data flow when three layers of forwarding unit reports for the first time literary composition; At first according to this IP report for the first time IP five-tuple, Inbound TOS information and the incoming interface inquiry Inbound Cache list item of literary composition; Because this moment, Inbound Cache list item was set up as yet, so in Inbound Cache list item, inquire about less than the Inbound process information to this data flow.Three layers of basic list item that the forwarding unit inquiry is preserved in advance; Obtain Inbound process information to this data flow; This information is kept in the Inbound Cache list item; See the following form 4, Inbound Cache list item includes interface, go into routing transmitting example of virtual private network (VRF, VPN Route & Forwarding Instance), IP five-tuple, Inbound TOS information, the professional Cache information of Inbound, outgoing interface and FIB information; Wherein, incoming interface, to go into VRF, IP five-tuple and Inbound TOS information be the key word of the inquiry in the Inbound Cache list item.The Inbound process information includes the professional Cache information of direction, outgoing interface and FIB information.
Table 4---Inbound Cache list item
Three layers of forwarding unit carries out the Inbound Business Processing according to this Inbound process information to this IP literary composition of reporting for the first time, as it is painted to carry out QOS Car, supposes that the flow rate of data flow this moment surpasses 1Mbps, is 6 with the report for the first time TOS territory assignment of literary composition of this IP.
Afterwards; Three layers of forwarding unit inquires direction Cache list item according to report for the first time IP five-tuple, outgoing direction TOS information (be 6 this moment) and the outgoing interface of literary composition of this IP; Because this moment, outgoing direction Cache list item was set up as yet, so in outgoing direction Cache list item, inquire about less than the outgoing direction process information to this data flow.Three layers of forwarding unit are inquired about basic list item, obtain the outgoing direction process information to this data flow, and this information is kept in the outgoing direction Cache list item, see the following form 5; Outgoing direction Cache list item comprises: outgoing interface, go out professional Cache information of VRF, IP five-tuple, outgoing direction TOS information, outgoing direction and link layer information; Wherein, outgoing interface, to go out VRF, IP five-tuple and outgoing direction TOS information be the key word of the inquiry in the outgoing direction Cache list item.The outgoing direction process information comprises professional Cache information of outgoing direction and link layer information.
Table 5---outgoing direction Cache list item
Three layers of forwarding unit carries out the outgoing direction Business Processing according to this outgoing direction process information to this IP literary composition of reporting for the first time, and this IP is reported for the first time to send after literary composition adds link layer header.
Second kind:
When three layers of forwarding unit receive the follow-up IP message of above-mentioned data flow; At first search Inbound Cache list item, see table 4, get access to this Inbound process information to this data flow; According to the information of obtaining this IP message is carried out the Inbound Business Processing; As it is painted to carry out QOS Car, supposes that the flow rate of data flow this moment is no more than 1Mbps, is 7 with the report for the first time TOS territory assignment of literary composition of this IP.
Afterwards; Three layers of forwarding unit is according to IP five-tuple, outgoing direction TOS information (be 7 this moment) and the outgoing interface of this IP message, and the outgoing direction Cache list item of setting up before the inquiry is seen table 5; Owing to do not preserve TOS in the table 5 as yet is 7 o'clock corresponding information, so inquiry is less than corresponding outgoing direction process information.Therefore, three layers of forwarding unit are inquired about basic list item once more, obtain corresponding outgoing direction process information, and this information is kept in the outgoing direction Cache list item, outgoing direction Cache list item are upgraded outgoing direction Cache list item after the renewal such as following table 6.
Table 6---the outgoing direction Cache list item after the renewal
Three layers of forwarding unit carry out the outgoing direction Business Processing according to this outgoing direction process information to this IP message, and this IP is reported for the first time to send after literary composition adds link layer header.
The third:
When three layers of forwarding unit receive the follow-up IP message of above-mentioned data flow; At first search Inbound Cache list item, see table 4, obtain this Inbound process information to this data flow; According to the information of obtaining this IP message is carried out the Inbound Business Processing; As it is painted to carry out QOS Car, supposes that the flow rate of data flow this moment is no more than 1Mbps, is 7 with the report for the first time TOS territory assignment of literary composition of this IP.
Afterwards; Three layers of forwarding unit is according to IP five-tuple, outgoing direction TOS information (be 7 this moment) and the outgoing interface of this IP message; The outgoing direction Cache list item of setting up before the inquiry is seen table 6, obtains the outgoing direction process information to this data flow; According to the information of obtaining this IP message is carried out the outgoing direction Business Processing, this IP is reported for the first time to send after literary composition adds link layer header.
It is thus clear that; Inbound Cache list item and outgoing direction Cache list item are set up in to IP message forwarding process and are brought in constant renewal in; When receiving the IP message of a data flow; If inquiry less than Inbound process information or outgoing direction process information to this data flow, is then inquired about the basic list item of preserving in advance, Query Result correspondingly is kept in Inbound Cache list item and the outgoing direction Cache list item; If can inquire, then directly this IP message is handled, thereby realized that IP changes soon according to Query Result.Because carrying out the painted back data flow of QOS Car can change into many data flow; In order in the Cache list item, to inquire the relevant information of this data flow; In Inbound Cache list item, preserve the painted pairing information of value of TOS before, and in outgoing direction Cache list item, preserve the painted pairing information of value of TOS afterwards.Like this; Delegation's content in the Inbound Cache list item is with the multiple line content in the corresponding outgoing direction Cache list item; Three layers of forwarding unit can further inquire direction Cache list item behind inquiry Inbound Cache list item; Finally obtain the process information of data flow, the IP message of this data flow is handled.In addition, the present invention can be used to also realize that the IP to multicast packet changes soon.Three layers of forwarding unit are many with a data flow replication when multicast data forwarding, every outgoing interface that data flow is corresponding different; Three layers of forwarding unit can be set up Inbound Cache list item and outgoing direction Cache list item; In Inbound Cache list item, preserve the pairing information of data flow before duplicating; And preserve the corresponding information of many data flow after duplicating at outgoing direction Cache list item, so just can realize the IP of multicast packet is changeed soon.
The present invention also proposes the fast three layers of forwarding unit that change of a kind of IP of realization, realizes the IP structural representation of three layers of forwarding unit of commentaries on classics soon like Fig. 4 for the present invention, and this equipment comprises:
The first list item maintenance module 403; Be used for when the inquiry of first enquiry module 401 less than to the Inbound process information of this data flow the time; The basic list item that inquiry is preserved in advance obtains the Inbound process information to this data flow, according to this Inbound process information this IP message is carried out the Inbound Business Processing; From this Inbound process information, obtain the outgoing interface of this IP message and notify second enquiry module, and this Inbound process information is saved in the Inbound Cache list item;
The second list item maintenance module 406; Be used for when the inquiry of second enquiry module 404 less than to the outgoing direction process information of this data flow the time; The basic list item that inquiry is preserved in advance; Obtain outgoing direction process information, according to this outgoing direction process information this IP message is carried out the outgoing direction Business Processing, and this outgoing direction process information is saved in the outgoing direction Cache list item to this data flow.
In the said equipment, Inbound Cache list item comprises: incoming interface, go into the professional Cache information of VRF, IP five-tuple, Inbound TOS information, Inbound, outgoing interface and FIB information; Wherein, said incoming interface, to go into VRF, IP five-tuple and Inbound TOS information be the key word of the inquiry in the Inbound Cache list item;
Outgoing direction Cache list item comprises: outgoing interface, go out professional Cache information of VRF, IP five-tuple, outgoing direction TOS information, outgoing direction and link layer information; Wherein, said outgoing interface, to go out VRF, IP five-tuple and outgoing direction TOS information be the key word of the inquiry in the outgoing direction Cache list item.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (4)
1. realize the fast method of changeing of IP for one kind, it is characterized in that said method comprises:
The IP message of A, receiving data stream; IP five-tuple, Inbound TOS information and incoming interface inquiry Inbound cache memory Cache list item according to this IP message; When the Inbound process information that inquires to this data flow; According to this Inbound process information this IP message is carried out the Inbound Business Processing, and from this Inbound process information, obtain the outgoing interface of this IP message, continue execution in step B; When inquiry less than to the Inbound process information of this data flow the time; The basic list item that inquiry is preserved in advance; Obtain Inbound process information, this IP message is carried out the Inbound Business Processing, from this Inbound process information, obtain the outgoing interface of this IP message according to this Inbound process information to this data flow; And this Inbound process information is saved in the Inbound Cache list item, continue execution in step B;
B, the IP five-tuple according to this IP message, outgoing direction COS TOS information and outgoing interface inquire direction Cache list item; When the outgoing direction process information that inquires to this data flow, this IP message is carried out the outgoing direction Business Processing according to this outgoing direction process information; When inquiry less than to the outgoing direction process information of this data flow the time; The basic list item that inquiry is preserved in advance; Obtain outgoing direction process information to this data flow; According to this outgoing direction process information this IP message is carried out the outgoing direction Business Processing, and this outgoing direction process information is saved in the outgoing direction Cache list item.
2. method according to claim 1; It is characterized in that said Inbound Cache list item comprises: incoming interface, go into the professional Cache information of routing transmitting example of virtual private network VRF, IP five-tuple, Inbound TOS information, Inbound, outgoing interface and FIB information; Wherein, said incoming interface, to go into VRF, IP five-tuple and Inbound TOS information be the key word of the inquiry in the Inbound Cache list item;
Said outgoing direction Cache list item comprises: outgoing interface, go out professional Cache information of VRF, IP five-tuple, outgoing direction TOS information, outgoing direction and link layer information; Wherein, said outgoing interface, to go out VRF, IP five-tuple and outgoing direction TOS information be the key word of the inquiry in the outgoing direction Cache list item.
3. realize the fast three layers of forwarding unit that change of IP for one kind, it is characterized in that said equipment comprises:
First enquiry module is used for when receiving the IP message of data flow, according to IP five-tuple, Inbound TOS information and the incoming interface inquiry Inbound Cache list item of this IP message;
First processing module; Be used for when first enquiry module inquires the Inbound process information to this data flow; According to this Inbound process information this IP message is carried out the Inbound Business Processing; And from this Inbound process information, obtain the outgoing interface of this IP message, notify second enquiry module with the outgoing interface of this IP message;
The first list item maintenance module; Be used for when first enquiry module inquiry less than to the Inbound process information of this data flow the time; The basic list item that inquiry is preserved in advance obtains the Inbound process information to this data flow, according to this Inbound process information this IP message is carried out the Inbound Business Processing; From this Inbound process information, obtain the outgoing interface of this IP message and notify second enquiry module, and this Inbound process information is saved in the Inbound Cache list item;
Second enquiry module is used for IP five-tuple, outgoing direction TOS information and outgoing interface according to this IP message, inquires direction Cache list item;
Second processing module is used for when second enquiry module inquires the outgoing direction process information to this data flow, according to this outgoing direction process information this IP message being carried out the outgoing direction Business Processing;
The second list item maintenance module; Be used for when second enquiry module inquiry less than to the outgoing direction process information of this data flow the time; The basic list item that inquiry is preserved in advance; Obtain outgoing direction process information, according to this outgoing direction process information this IP message is carried out the outgoing direction Business Processing, and this outgoing direction process information is saved in the outgoing direction Cache list item to this data flow.
4. equipment according to claim 3 is characterized in that, said Inbound Cache list item comprises: incoming interface, go into the professional Cache information of VRF, IP five-tuple, Inbound TOS information, Inbound, outgoing interface and FIB information; Wherein, said incoming interface, to go into VRF, IP five-tuple and Inbound TOS information be the key word of the inquiry in the Inbound Cache list item;
Said outgoing direction Cache list item comprises: outgoing interface, go out professional Cache information of VRF, IP five-tuple, outgoing direction TOS information, outgoing direction and link layer information; Wherein, said outgoing interface, to go out VRF, IP five-tuple and outgoing direction TOS information be the key word of the inquiry in the outgoing direction Cache list item.
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|---|---|
| CN102316012B (en) | 2014-05-14 |
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