CN102316012B - 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 and turn soon technical field, relate in particular to method and three layers of forwarding unit that a kind of IP of realization turns soon.
Background technology
The thinking of accelerating to process based on cache memory (Cache) is widely used in computer realm, comprises hardware and software field.Its basic ideas are: for flow process first, by this first flow process process based on basic list item, and set up corresponding Cache list item; For non-flow process first, the Cache list item based on setting up before accelerates to process.In the time that basic contents in table changes, it is invalid that corresponding Cache list item is set to, and handling process switches back to flow process first.
Three layers of forwarding unit, in the time turning transmitting IP packet, also can be applied the above-mentioned thinking of accelerating processing based on Cache, realize the fast-forwarding to IP message, and this mode is called IP and turns soon.
If Fig. 1 is that in prior art, three layers of forwarding unit carry out the mode schematic diagram that IP turns soon.In three layers of forwarding unit, preserve in advance the basic list item such as forwarding information table (FIB), Inbound traffic table and outgoing direction traffic table.When three layers of forwarding unit are received the IP message of a data flow, first query cache list item, judges whether to inquire the Query Result for this data flow; If inquiry less than, the basic list item that inquiry is preserved in advance, generates for the Query Result of this data flow, according to this Query Result, the message of this data flow is processed, and this Query Result is kept in Cache list item; If can inquire, according to this Query Result, this IP message is processed.In actual process, in the time receiving the IP of a data flow and report for the first time literary composition, three layers of forwarding unit are searched basic list item, generate the Query Result for this data flow, and Query Result is kept in Cache list item; In the time receiving the non-IP of this data flow and report for the first time literary composition, three layers of direct query cache list item of forwarding unit.Obviously, directly query cache list item wants beguine more quick according to basic list item generated query result, therefore, adopts and can realize in this way the fast-forwarding to IP message.
During IP forwards, some business (for example PBR, Netstream, QOS) can be processed based on IP precedence, and IP precedence adopts COS (TOS, the Type of Service) territory in IP message to carry.For making IP turn soon the business in tenaculum TOS territory, the Cache list item organizational form that IP turns soon can be IP five-tuple+TOS, that is: in the time receiving that the IP of a data flow reports for the first time literary composition, IP five-tuple (comprising object IP, source IP, destination interface, source port, protocol number) and the basic list item of TOS information inquiry of reporting for the first time civilian based on this IP, generate the Query Result for this data flow, according to Query Result, this IP literary composition of reporting for the first time is processed, and Query Result is kept in Cache list item; Wherein, Cache list item includes interface, IP five-tuple, TOS, business Cache information, outgoing interface, the first-class information of link layer, as shown in table 1 below; In the time receiving that the non-IP of a data flow reports for the first time literary composition, the IP five-tuple of reporting for the first time civilian based on this non-IP and TOS information inquiry Cache list item, process this non-IP literary composition of reporting for the first time according to Query Result.
Table 1---the Cache list item based on IP five-tuple+TOS
Said method there will be problem in some cases, as, arrange access rate (CAR for Inbound, Committed Access Rate) to configure painted and painted be the data flow in TOS territory, enter a data flow of forwarding unit, in the time of IP Inbound Business Processing, be a data flow, but can become many data flow after IP outgoing direction carries out QOS processing, this is because QOS processing meeting is carried out paintedly according to CAR result, gives different values to TOS.For example, QOS processing is carried out painted to the data flow shown in following table 2, and painted result is relevant to the flow rate of data flow; In the time that flow rate exceedes 1Mbps, be 6 by the TOS assignment of data flow; In the time that flow rate is no more than 1Mbps, be 7 by the TOS assignment of data flow.
| Object 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 processes, the data flow shown in table 2 is converted into 2 data flow shown in following table 3.
| Object 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 QOS 2 data flow after treatment
Visible, due to after QOS processes, data fail to be convened for lack of a quorum and are converted into many data flow, and Cache list item has only been preserved the relevant information for a QOS data flow before treatment, so, QOS many data flow after treatment just cannot be searched Cache list item, also just cannot realize IP and turn soon.
Summary of the invention
The invention provides a kind of method that IP of realization turns soon, the IP that can realize the data flow to processing through QOS turns soon.
Three layers of forwarding unit that the present invention also provides a kind of IP of realization to turn soon, the IP that can realize the data flow to processing through QOS turns soon.
Technical scheme of the present invention is achieved in that
Realize the method that IP turns soon, comprising:
The IP message of A, 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 inquire for this data flow Inbound process information time, according to this Inbound process information, this IP message is carried out to Inbound Business Processing, and from this Inbound process information, obtain the outgoing interface of this IP message, continue execution step B; When inquiry is during less than Inbound process information for this data flow, the basic list item that inquiry is preserved in advance, obtain the Inbound process information for this data flow, according to this Inbound process information, this IP message is carried out to Inbound Business Processing, from this Inbound process information, obtain the outgoing interface of this IP message, and this Inbound process information is saved in Inbound Cache list item, continue execution step B;
B, according to the IP five-tuple of this IP message, outgoing direction TOS information and outgoing interface, inquire direction Cache list item, when inquire for this data flow outgoing direction process information time, according to this outgoing direction process information, this IP message is carried out to outgoing direction Business Processing; When inquiry is during less than outgoing direction process information for this data flow, the basic list item that inquiry is preserved in advance, obtain the outgoing direction process information for this data flow, according to this outgoing direction process information, this IP message is carried out to outgoing direction Business Processing, and this outgoing direction process information is saved in outgoing direction Cache list item.
Realize three layers of forwarding unit that IP turns soon, comprising:
The first enquiry module, in the time receiving the IP message of data flow, according to the IP five-tuple of this IP message, Inbound TOS information and incoming interface inquiry Inbound Cache list item;
The first processing module, when inquiring the Inbound process information for this data flow when the first enquiry module, according to this Inbound process information, this IP message is carried out to Inbound Business Processing, and from this Inbound process information, obtain the outgoing interface of this IP message, notify the second enquiry module by the outgoing interface of this IP message;
The first list item maintenance module, when inquiring about less than Inbound process information for this data flow when the first enquiry module, the basic list item that inquiry is preserved in advance, obtain the Inbound process information for this data flow, according to this Inbound process information, this IP message is carried out to Inbound Business Processing, from this Inbound process information, obtain the outgoing interface of this IP message and notify the second enquiry module, and this Inbound process information is saved in Inbound Cache list item;
The second enquiry module, for according to the IP five-tuple of this IP message, outgoing direction TOS information and outgoing interface, inquires direction Cache list item;
The second processing module, when inquire the outgoing direction process information for this data flow when the second enquiry module, carries out outgoing direction Business Processing according to this outgoing direction process information to this IP message;
The second list item maintenance module, when inquiring about less than outgoing direction process information for this data flow when the second enquiry module, the basic list item that inquiry is preserved in advance, obtain the outgoing direction process information for this data flow, according to this outgoing direction process information, this IP message is carried out to outgoing direction Business Processing, and this outgoing direction process information is saved in outgoing direction Cache list item.
Visible, what the present invention proposed realizes method and the three layers of forwarding unit that IP turns soon, set up 2 Cache list items for a data flow, include direction Cache list item and outgoing direction Cache list item, in the time receiving the IP message of a data flow, inquire about successively Inbound Cache list item and outgoing direction Cache list item, according to Query Result, this IP message is processed; If inquiry is less than Inbound Cache list item or outgoing direction Cache list item, the basic list item that inquiry is preserved in advance, according to Query Result, this IP message is processed, and Query Result is kept in Inbound Cache list item or outgoing direction Cache list item, so that three layers of forwarding unit use in the time forwarding the follow-up IP message of this data flow.In this way, realized the IP of the data flow through QOS processing has been turned soon.
Accompanying drawing explanation
Fig. 1 is that in prior art, three layers of forwarding unit carry out the mode schematic diagram that IP turns soon;
Fig. 2 is that the present invention realizes the method flow diagram that IP turns soon;
Fig. 3 is that in prior art, three layers of forwarding unit carry out the mode schematic diagram that IP turns soon;
Fig. 4 is the structural representation that the present invention realizes three layers of forwarding unit that IP turns soon.
Embodiment
The present invention proposes a kind of method that IP of realization turns soon, and the method is for turning soon the IP of the data flow of processing through QOS.If Fig. 2 is that the present invention realizes the method flow diagram that IP turns soon, the 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 inquire for this data flow Inbound process information time, execution step 202; When inquiry is during less than Inbound process information for this data flow, execution step 203;
Step 202: according to the Inbound process information for this data flow, this IP message is carried out to Inbound Business Processing, and obtain the outgoing interface of this IP message from this Inbound process information, continue execution step 204;
Step 203: the basic list item that inquiry is preserved in advance, obtain the Inbound process information for this data flow, according to this Inbound process information, this IP message is carried out to Inbound Business Processing, from this Inbound process information, obtain the outgoing interface of this IP message, and this Inbound process information is saved in Inbound Cache list item, continue execution step 204;
Step 204: inquire direction Cache list item according to the IP five-tuple of this IP message, outgoing direction TOS information and outgoing interface, when inquire for this data flow outgoing direction process information time, execution step 205; When inquiry is during less than outgoing direction process information for this data flow, execution step 206;
Step 205: according to the outgoing direction process information for this data flow, this IP message is carried out to outgoing direction Business Processing, finish current flow process;
Step 206: the basic list item that inquiry is preserved in advance, obtain the outgoing direction process information for this data flow, according to this outgoing direction process information, this IP message is carried out to outgoing direction Business Processing, and this outgoing direction process information is saved in outgoing direction Cache list item.
If Fig. 3 is that in prior art, three layers of forwarding unit carry out the mode schematic diagram that IP turns soon.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 turned soon.
Below lifting specific embodiment introduces in detail.
In the present embodiment, be introduced as an example of the data flow shown in table 2 example.For the different IP message of this data flow, the mode of processing is different, below divides various situations to introduce respectively.
The first:
When the IP that receives this data flow when three layers of forwarding unit reports for the first time literary composition, IP five-tuple, Inbound TOS information and the incoming interface inquiry Inbound Cache list item of first reporting for the first time civilian according to this IP, because Inbound Cache list item now is not yet set up, thus in Inbound Cache list item inquiry less than the Inbound process information for this data flow.Three layers of basic list item that forwarding unit inquiry is preserved in advance, obtain the Inbound process information for this data flow, this information is kept in Inbound Cache list item, see the following form 4, Inbound Cache list item includes interface, enter routing transmitting example of virtual private network (VRF, VPN Route & Forwarding Instance), IP five-tuple, Inbound TOS information, Inbound business Cache information, outgoing interface and FIB information; Wherein, incoming interface, to enter VRF, IP five-tuple and Inbound TOS information be the key word of the inquiry in Inbound Cache list item.Inbound process information includes direction business Cache information, outgoing interface and FIB information.
Table 4---Inbound Cache list item
Three layers of forwarding unit carries out 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 now the flow rate of data flow exceedes 1Mbps, and the TOS territory assignment that this IP is reported for the first time civilian is 6.
Afterwards, IP five-tuple, outgoing direction TOS information (being now 6) and outgoing interface that three layers of forwarding unit reported for the first time civilian according to this IP inquire direction Cache list item, because outgoing direction Cache list item now is not yet set up, thus in outgoing direction Cache list item inquiry less than the outgoing direction process information for this data flow.Three layers of forwarding unit are inquired about basic list item, obtain the outgoing direction process information for this data flow, and this information is kept in outgoing direction Cache list item, see the following form 5; Outgoing direction Cache list item comprises: outgoing interface, go out VRF, IP five-tuple, outgoing direction TOS information, outgoing direction business Cache information 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 outgoing direction Cache list item.Outgoing direction process information comprises outgoing direction business Cache information and link layer information.
Table 5---outgoing direction Cache list item
Three layers of forwarding unit carries out 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 after literary composition adds link layer header and sent.
The second:
In the time that three layers of forwarding unit receive the follow-up IP message of above-mentioned data flow, first search Inbound Cache list item, in table 4, get this Inbound process information for this data flow, according to the information of obtaining, this IP message is carried out to Inbound Business Processing, as it is painted to carry out QOS Car, supposes that now the flow rate of data flow is no more than 1Mbps, the TOS territory assignment that this IP is reported for the first time civilian is 7.
Afterwards, three layers of forwarding unit are according to the IP five-tuple of this IP message, outgoing direction TOS information (being now 7) and outgoing interface, the outgoing direction Cache list item of setting up before inquiry, in table 5, be 7 o'clock corresponding information owing to not yet preserving TOS in table 5, therefore inquiry is less than corresponding outgoing direction process information.Therefore, three layers of forwarding unit are inquired about basic list item again, obtain corresponding outgoing direction process information, and this information is kept in outgoing direction Cache list item, and outgoing direction Cache list item is upgraded, and the outgoing direction Cache list item after renewal is as following table 6.
Table 6---the outgoing direction Cache list item after renewal
Three layers of forwarding unit carry out outgoing direction Business Processing according to this outgoing direction process information to this IP message, and this IP is reported for the first time after literary composition adds link layer header and sent.
The third:
In the time that three layers of forwarding unit receive the follow-up IP message of above-mentioned data flow, first search Inbound Cache list item, in table 4, obtain this Inbound process information for this data flow, according to the information of obtaining, this IP message is carried out to Inbound Business Processing, as it is painted to carry out QOS Car, supposes that now the flow rate of data flow is no more than 1Mbps, the TOS territory assignment that this IP is reported for the first time civilian is 7.
Afterwards, three layers of forwarding unit are according to the IP five-tuple of this IP message, outgoing direction TOS information (being now 7) and outgoing interface, the outgoing direction Cache list item of setting up before inquiry, in table 6, obtain the outgoing direction process information for this data flow, according to the information of obtaining, this IP message is carried out to outgoing direction Business Processing, this IP is reported for the first time after literary composition adds link layer header and sent.
Visible, Inbound Cache list item and outgoing direction Cache list item are to set up and constantly update in to the repeating process of IP message, in the time receiving the IP message of a data flow, if inquiry is less than the Inbound process information for this data flow or outgoing direction process information, the basic list item that inquiry is preserved in advance, is correspondingly kept at Query Result in Inbound Cache list item and outgoing direction Cache list item; If can inquire, directly according to Query Result, this IP message is processed, turn soon thereby realize IP.Fail to be convened for lack of a quorum and change into many data flow owing to carrying out the painted rear data of QOS Car, in order to inquire the relevant information of this data flow in Cache list item, in Inbound Cache list item, preserve painted before the corresponding information of value of TOS, and in outgoing direction Cache list item, preserve painted after the corresponding information of value of TOS.Like this, a line content in Inbound Cache list item is by the multiple line content in corresponding outgoing direction Cache list item, three layers of forwarding unit can further inquire direction Cache list item after inquiry Inbound Cache list item, finally obtain the process information of data flow, the IP message of this data flow is processed.In addition, the present invention also can turn the IP of multicast packet soon for realizing.Three layers of forwarding unit, in the time of multicast data forwarding, copy as many by a data flow, 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 corresponding information of data flow before copying, and preserve information corresponding to many data flow after copying at outgoing direction Cache list item, so just can realize the IP of multicast packet is turned soon.
The present invention also proposes three layers of forwarding unit that a kind of IP of realization turns soon, and if Fig. 4 is the structural representation that the present invention realizes three layers of forwarding unit that IP turns soon, this equipment comprises:
The first enquiry module 401, in the time receiving the IP message of data flow, according to the IP five-tuple of this IP message, Inbound TOS information and incoming interface inquiry Inbound Cache list item;
The first processing module 402, when inquiring the Inbound process information for this data flow when the first enquiry module 401, according to this Inbound process information, this IP message is carried out to Inbound Business Processing, and from this Inbound process information, obtain the outgoing interface of this IP message, notify the second enquiry module 404 by the outgoing interface of this IP message;
The first list item maintenance module 403, when inquire about less than Inbound process information for this data flow when the first enquiry module 401, the basic list item that inquiry is preserved in advance, obtain the Inbound process information for this data flow, according to this Inbound process information, this IP message is carried out to Inbound Business Processing, from this Inbound process information, obtain the outgoing interface of this IP message and notify the second enquiry module, and this Inbound process information is saved in Inbound Cache list item;
The second enquiry module 404, for according to the IP five-tuple of this IP message, outgoing direction TOS information and outgoing interface, inquires direction Cache list item;
The second processing module 405, for when the second enquiry module inquiry 404 is during to outgoing direction process information for this data flow, carries out outgoing direction Business Processing according to this outgoing direction process information to this IP message;
The second list item maintenance module 406, when inquire about less than outgoing direction process information for this data flow when the second enquiry module 404, the basic list item that inquiry is preserved in advance, obtain the outgoing direction process information for this data flow, according to this outgoing direction process information, this IP message is carried out to outgoing direction Business Processing, and this outgoing direction process information is saved in outgoing direction Cache list item.
In the said equipment, Inbound Cache list item comprises: incoming interface, enter VRF, IP five-tuple, Inbound TOS information, Inbound business Cache information, outgoing interface and FIB information; Wherein, described incoming interface, to enter VRF, IP five-tuple and Inbound TOS information be the key word of the inquiry in Inbound Cache list item;
Outgoing direction Cache list item comprises: outgoing interface, go out VRF, IP five-tuple, outgoing direction TOS information, outgoing direction business Cache information and link layer information; Wherein, described outgoing interface, to go out VRF, IP five-tuple and outgoing direction TOS information be the key word of the inquiry in outgoing direction Cache list item.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (4)
1. realize the method that IP turns soon, it is characterized in that, described method comprises:
The IP message of A, receiving data stream, according to the IP five-tuple of this IP message, Inbound COS TOS information and incoming interface inquiry Inbound cache memory Cache list item, when inquire for this data flow Inbound process information time, according to this Inbound process information, this IP message is carried out to Inbound Business Processing, and from this Inbound process information, obtain the outgoing interface of this IP message, continue execution step B; When inquiry is during less than Inbound process information for this data flow, the basic list item that inquiry is preserved in advance, obtain the Inbound process information for this data flow, according to this Inbound process information, this IP message is carried out to Inbound Business Processing, from this Inbound process information, obtain the outgoing interface of this IP message, and this Inbound process information is saved in Inbound Cache list item, continue execution step B; Wherein, described Inbound Business Processing comprises that to carry out QOS Car painted, and assignment is carried out in the TOS territory of IP message, obtains outgoing direction TOS information;
B, inquire direction Cache list item according to the IP five-tuple of this IP message, outgoing direction TOS information and outgoing interface, when inquire for this data flow outgoing direction process information time, according to this outgoing direction process information, this IP message is carried out to outgoing direction Business Processing; When inquiry is during less than outgoing direction process information for this data flow, the basic list item that inquiry is preserved in advance, obtain the outgoing direction process information for this data flow, according to this outgoing direction process information, this IP message is carried out to outgoing direction Business Processing, and this outgoing direction process information is saved in outgoing direction Cache list item.
2. method according to claim 1, it is characterized in that, described Inbound Cache list item comprises: incoming interface, enter routing transmitting example of virtual private network VRF, IP five-tuple, Inbound TOS information, Inbound business Cache information, outgoing interface and FIB information; Wherein, described incoming interface, to enter VRF, IP five-tuple and Inbound TOS information be the key word of the inquiry in Inbound Cache list item;
Described outgoing direction Cache list item comprises: outgoing interface, go out VRF, IP five-tuple, outgoing direction TOS information, outgoing direction business Cache information and link layer information; Wherein, described outgoing interface, to go out VRF, IP five-tuple and outgoing direction TOS information be the key word of the inquiry in outgoing direction Cache list item.
3. realize three layers of forwarding unit that IP turns soon, it is characterized in that, described equipment comprises:
The first enquiry module, in the time receiving the IP message of data flow, according to the IP five-tuple of this IP message, Inbound TOS information and incoming interface inquiry Inbound Cache list item;
The first processing module, when inquiring the Inbound process information for this data flow when the first enquiry module, according to this Inbound process information, this IP message is carried out to Inbound Business Processing, and from this Inbound process information, obtain the outgoing interface of this IP message, notify the second enquiry module by the outgoing interface of this IP message; Wherein, described Inbound Business Processing comprises that to carry out QOS Car painted, and assignment is carried out in the TOS territory of IP message, obtains outgoing direction TOS information;
The first list item maintenance module, when inquiring about less than Inbound process information for this data flow when the first enquiry module, the basic list item that inquiry is preserved in advance, obtain the Inbound process information for this data flow, according to this Inbound process information, this IP message is carried out to Inbound Business Processing, from this Inbound process information, obtain the outgoing interface of this IP message and notify the second enquiry module, and this Inbound process information is saved in Inbound Cache list item;
The second enquiry module, for according to the IP five-tuple of this IP message, outgoing direction TOS information and outgoing interface, inquires direction Cache list item;
The second processing module, when inquire the outgoing direction process information for this data flow when the second enquiry module, carries out outgoing direction Business Processing according to this outgoing direction process information to this IP message;
The second list item maintenance module, when inquiring about less than outgoing direction process information for this data flow when the second enquiry module, the basic list item that inquiry is preserved in advance, obtain the outgoing direction process information for this data flow, according to this outgoing direction process information, this IP message is carried out to outgoing direction Business Processing, and this outgoing direction process information is saved in outgoing direction Cache list item.
4. equipment according to claim 3, is characterized in that, described Inbound Cache list item comprises: incoming interface, enter VRF, IP five-tuple, Inbound TOS information, Inbound business Cache information, outgoing interface and FIB information; Wherein, described incoming interface, to enter VRF, IP five-tuple and Inbound TOS information be the key word of the inquiry in Inbound Cache list item;
Described outgoing direction Cache list item comprises: outgoing interface, go out VRF, IP five-tuple, outgoing direction TOS information, outgoing direction business Cache information and link layer information; Wherein, described outgoing interface, to go out VRF, IP five-tuple and outgoing direction TOS information be the key word of the inquiry in outgoing direction Cache list item.
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| CN102647343B (en) * | 2012-03-30 | 2016-01-06 | 汉柏科技有限公司 | The flow control methods of secure networking device and system |
| CN103384221A (en) * | 2013-06-26 | 2013-11-06 | 汉柏科技有限公司 | Method for optimizing service precedence message fast forwarding |
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| CN1414736A (en) * | 2002-05-24 | 2003-04-30 | 华为技术有限公司 | Method of implementing quick retransmission and supporting load sharing |
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