CN101262435B - A return method and device for stream forward items - Google Patents
A return method and device for stream forward items Download PDFInfo
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- CN101262435B CN101262435B CN2008100890510A CN200810089051A CN101262435B CN 101262435 B CN101262435 B CN 101262435B CN 2008100890510 A CN2008100890510 A CN 2008100890510A CN 200810089051 A CN200810089051 A CN 200810089051A CN 101262435 B CN101262435 B CN 101262435B
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Abstract
The embodiment of the invention discloses a method and a device for recovering stream forwarding table items. The method for recovering stream forwarding table items comprises the following steps: an ineffective first table item is searched by traversing the stream forwarding table items and then index information of the stream forwarding table items is recorded; when a second table item corresponding to the index information of the stream forwarding table items is effective, the second table item is determined as a hanged stream forwarding table item according to application condition of the ineffective first table item; the hanged second table item is recovered according to the index information of the stream forwarding table. The method and the device of the embodiment of the invention searches for ineffective stream forwarding table items by traversing the stream forwarding table items and then recovers ineffective stream forwarding table items, thus ensuring consistency of table items of the stream forwarding table and preventing stream forwarding table resources from being leaked.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of recovery method of stream forwarding list item and device.
Background technology
Processing forwards data packets one by one and sends out a dual mode based on circulation data communications equipment usually to message forwarding.Each message that exactly equipment is received that forwards data packets one by one all will be searched two layers of ARP (AddressResolution Protocol, address resolution protocol) table, three layers of routing table, four layers of ACL actions such as (Access ControlList, Access Control List (ACL)) are transmitted then.Send out based on circulation, the equipment of being meant receives when first packet is first bag of message and searches many tables that comprise two layers of ARP table, three layers of routing table, four layers of ACL table etc., sets up stream forwarding list item and message is transmitted.The stream forwarding list of setting up comprises KEY (key assignments) and DATA (action list item) two parts.KEY is the foundation that subsequent packet is searched coupling, generally includes the five-tuple information of source IP address, purpose IP address, source port number, destination slogan and protocol number; DATA mainly comprise next-hop ip address or MAC Address, outgoing interface index, for this message do which function enable operation, disposed information such as which parameter.When subsequent packet arrives, earlier remove to mate the stream forwarding list of building up with KEY value, then directly utilize the various parameters among the stream forwarding list DATA that builds up before to carry out the message forwarding for the message of identical KEY value.Compare with forwarding data packets one by one, send out based on circulation and revolution is sent out a bag all need simplified control to many tables, subsequent packet is only looked into the operation of a stream forwarding list for only first packet being looked into many tables.Therefore, send out the handling property and the forwarding performance that can improve data communications equipment effectively based on circulation.
Store a large amount of convection current in the stream forwarding list and transmitted Useful Information, bigger to expending of resource.In order to make full use of system resource, there is rational reclaim mechanism to reclaim the stream forwarding list item that no longer uses.
Usually, data communications equipment reclaims stream forwarding list item by the aging mechanism of stream forwarding list.In certain ageing time, the stream forwarding list that is hit by subsequent packet can be by aging, and the KEY of stream forwarding list and DATA will be reclaimed by aging respectively.In ageing time then, the DATA that reclaims stream forwarding list earlier reclaims the KEY of stream forwarding list again, can certainly reclaim KEY earlier and reclaim DATA again.
But the inventor finds: if the stream forwarding list ageing process takes place unusually in the data communications equipment, might cause stream forwarding list only to wear out half, form the KEY or the DATA that hang, cause the stream forwarding list resource to reveal.
In the method for building up of existing another kind of stream forwarding list, after data communications equipment receives the message first packet, at first according to this message first packet data search MAC (Media Access Control, the medium access control) table, routing table, ACL table etc. are transmitted relevant list item with message, set up the KEY of stream forwarding list, the index that distributes for KEY is index, transmits the result of relevant entries according to searching message then, is the DATA that stream forwarding list set up in index with index.The DATA that can certainly set up stream forwarding list earlier sets up the KEY of stream forwarding list again.
But the inventor finds: if loss of data takes place in the stream forwarding list constructive process, also may cause stream forwarding list only to set up KEY or only set up DATA, form and hang list item.
In realizing process of the present invention, the inventor finds that there is following problem at least in prior art: data communications equipment is at stream forwarding list in the process such as aging or stream forwarding list foundation, might produce the KEY of stream forwarding list and DATA situation one to one, the stream forwarding list item that formation is hung causes the stream forwarding list resource to reveal.
Summary of the invention
The embodiment of the invention provides a kind of recovery method and device of stream forwarding list item, with realization the stream forwarding list item of hanging is reclaimed, and guarantees the consistency of stream forwarding list item.
For achieving the above object, the embodiment of the invention provides a kind of recovery method of stream forwarding list item on the one hand, may further comprise the steps:
Ergodic flow is transmitted, and searches the first invalid list item according to the operating position of first list item, after finding the described first invalid list item, writes down the index information of described stream forwarding list;
When second list item of the index information correspondence of described stream forwarding list is effective, determine that according to the operating position of described invalid first list item described second list item is the stream forwarding list item of hanging;
Index information according to described stream forwarding list reclaims described second list item of hanging.
On the other hand, the embodiment of the invention provides a kind of retracting device of stream forwarding list item, comprising:
Search module, be used for ergodic flow and transmit, search the first invalid list item according to the operating position of first list item;
The index information logging modle is used in the described module searches of searching writing down the index information of described stream forwarding list after the described first invalid list item;
Hang the list item determination module, be used for when second list item of the index information correspondence of the stream forwarding list of described index information logging modle record is effective, determine that according to the operating position of described invalid first list item described second list item is the stream forwarding list item of hanging;
The list item recycling module is used for reclaiming described second list item of hanging according to the index information of described stream forwarding list.
Compared with prior art, the embodiment of the invention has the following advantages: the embodiment of the invention is transmitted by ergodic flow, search invalid stream forwarding list item, after finding invalid stream forwarding list item, invalid stream forwarding list item is reclaimed, thereby guaranteed the consistency of the list item of stream forwarding list, avoided the leakage of stream forwarding list resource.
Description of drawings
Fig. 1 is the flow chart of the recovery method of embodiment of the invention stream forwarding list item;
Fig. 2 is the flow chart of the recovery method embodiment one of stream forwarding list item of the present invention;
Fig. 3 is the flow chart of the recovery method embodiment two of stream forwarding list item of the present invention;
Fig. 4 is the structural representation of the retracting device of embodiment of the invention stream forwarding list item.
Embodiment
The embodiment of the invention provides a kind of recovery method of stream forwarding list item, by regularly traveling through all stream forwarding list items, find the KEY or the DATA that hang in the stream forwarding list, and KEY or the DATA that hangs in the stream forwarding list reclaimed, KEY and DATA with the assurance stream forwarding list are corresponding one by one, avoid the stream forwarding list resource to reveal.
As shown in Figure 1, the flow chart for the recovery method of embodiment of the invention stream forwarding list item specifically may further comprise the steps:
Step S101, ergodic flow is transmitted, and searches the first invalid list item, after finding the first invalid list item, the index information that recorded stream is transmitted.In the embodiment of the invention, when data communications equipment is transmitted at ergodic flow, adopt the regularly method of traversal,, when the timer time of setting arrives, travel through this stream forwarding list, search first invalid in the stream forwarding list list item by timer is set.But the embodiment of the invention is not limited thereto, and the method that any ergodic flow is transmitted all should fall into the protection range of the embodiment of the invention.
Step S102 when second list item of the index information correspondence of stream forwarding list is effective, determines according to the operating position of the first invalid list item whether second list item is the stream forwarding list item of hanging.Be specially:
When second list item was effective, whether the first invalid list item that finds among the determining step S101 was used, and was judging that the first invalid list item is not used yet, promptly this first list item still invalid after, determine that second list item is the stream forwarding list item of hanging.
Step S103 reclaims second list item of hanging according to the index information of stream forwarding list.
After definite second list item is the stream forwarding list item of hanging, reclaim second list item hang according to the index information of the stream forwarding list of record.
In addition, in the embodiment of the invention, when first list item was the action list item, second list item was the key assignments list item; Perhaps, when first list item was the key assignments list item, described second list item was the action list item.
The recovery method of above-mentioned stream forwarding list item, transmit by ergodic flow, search invalid stream forwarding list item, after finding invalid stream forwarding list item, invalid stream forwarding list item is reclaimed, thereby guaranteed the consistency of the list item of stream forwarding list, improved the reliability of the system of sending out based on circulation, and realize simply, safe and reliable, can not impact main flow.
As shown in Figure 2, be the flow chart of the recovery method embodiment one of stream forwarding list item of the present invention, the key assignments (KEY) of hanging in the stream forwarding list is reclaimed specifically may further comprise the steps:
Step S201, ergodic flow is transmitted, and searches action schedule invalid in this stream forwarding list (DATA) list item, after finding invalid action schedule (DATA) list item, execution in step S202 if do not find invalid action schedule (DATA) list item, then withdraws from this traversing operation.
In the embodiment of the invention, when data communications equipment is transmitted at ergodic flow, adopt the regularly method of traversal, by a timer is set, when the timer time of setting arrived, ergodic flow was transmitted, and searches action schedule invalid in the stream forwarding list (DATA) list item.But the embodiment of the invention is not limited thereto, and the method that any ergodic flow is transmitted all should fall into the protection range of the embodiment of the invention.
Step S202 writes down the index information of this stream forwarding list, judges according to the index information of this stream forwarding list whether the key assignments (KEY) of the stream forwarding list of this index information correspondence is used.After finding invalid action schedule (DATA) list item, data communications equipment is according to the index information of this invalid action schedule (DATA) list item place stream forwarding list, whether the key assignments (KEY) of judging the stream forwarding list of this index information correspondence is used, if the key assignments of the stream forwarding list of this index information correspondence (KEY) is used, promptly this key assignments (KEY) is effective this moment, then execution in step S203; If the key assignments of the stream forwarding list of this index information correspondence (KEY) is not used, promptly this key assignments (KEY) is invalid this moment, then withdraws from the ergodic process of this stream forwarding list.
Step S203 detects once more whether invalid action schedule (DATA) list item is used in the stream forwarding list of index information correspondence of stream forwarding list, with the key assignments (KEY) of the stream forwarding list of confirming this index information correspondence whether for hanging list item.The above-mentioned step of reaffirming, the stream forwarding list erroneous judgement of having avoided data communications equipment is being set up is for hanging list item.
When described invalid action schedule (DATA) when list item is used, show that then this action schedule (DATA) list item still is effective stream forwarding list item this moment, therefore the key assignments (KEY) of this action schedule (DATA) list item correspondence is not the stream forwarding list item of hanging, so return execution in step S201, continue ergodic flow and transmit; When described invalid action schedule (DATA) when list item is not used, execution in step S204.
Step S204, the key assignments (KEY) of invalid action list item (DATA) the list item correspondence that affirmation finds is the stream forwarding list item of hanging.Owing to invalid action schedule (DATA) list item in the stream forwarding list of the index information correspondence that detects stream forwarding list once more is not used, therefore this invalid action schedule (DATA) list item remains invalid, so the key assignments (KEY) of this invalid action schedule (DATA) list item correspondence is the stream forwarding list item of hanging.
Step S205 reclaims key assignments (KEY) list item by force according to the index information of stream forwarding list.After the key assignments (KEY) of invalid action schedule (DATA) the list item correspondence of confirming to find is the stream forwarding list item of hanging, data communications equipment reclaims this key assignments of hanging (KEY) list item, thereby guaranteed the consistency of the DATA and the KEY of stream forwarding list, avoided the stream forwarding list resource leakage that list item causes of hanging of stream forwarding list.
The recovery method of above-mentioned stream forwarding list item, transmit by the timing ergodic flow, search action schedule invalid in the stream forwarding list (DATA) list item, after finding invalid action schedule (DATA) list item, determine whether key assignments (KEY) list item corresponding with this action schedule (DATA) list item is invalid stream forwarding list item, and invalid key assignments (KEY) list item reclaimed, thereby guaranteed the consistency of action schedule (DATA) list item and key assignments (KEY) list item of stream forwarding list, avoid the leakage of stream forwarding list resource, improved the reliability of the system of sending out based on circulation.
As shown in Figure 3, the flow chart for the recovery method embodiment two of stream forwarding list item of the present invention, reclaim specifically and may further comprise the steps action schedule (DATA) list item of hanging in the stream forwarding list:
Step S301, ergodic flow is transmitted, and searches key assignments invalid in this stream forwarding list (KEY).Finding invalid key assignments (KEY) afterwards, execution in step S302 if do not find invalid key assignments (KEY), then withdraws from this traversing operation.
In the embodiment of the invention, when data communications equipment is transmitted at ergodic flow, adopt the regularly method of traversal, by a timer is set, when the timer time of setting arrived, ergodic flow was transmitted, and searches key assignments invalid in the stream forwarding list (KEY).But the embodiment of the invention is not limited thereto, and the method that any ergodic flow is transmitted all should fall into the protection range of the embodiment of the invention.
The index information that step S302, recorded stream transmit judges according to the index information of this stream forwarding list whether action schedule (DATA) list item of the stream forwarding list of this index information correspondence is used.Finding invalid key assignments (KEY) afterwards, data communications equipment is according to the index information of this invalid key assignments (KEY) place stream forwarding list, whether action schedule (DATA) list item of judging the stream forwarding list of this index information correspondence is used, if the action schedule of the stream forwarding list of this index information correspondence (DATA) list item is used, promptly this action schedule (DATA) list item is effective this moment, then execution in step S303; If the action schedule of the stream forwarding list of this index information correspondence (DATA) list item is not used, promptly this action schedule (DATA) list item is invalid this moment, then withdraws from the ergodic process of this stream forwarding list.
Step S303 detects once more whether invalid key assignments (KEY) is used in the stream forwarding list of index information correspondence of stream forwarding list, with action schedule (DATA) list item of the stream forwarding list of confirming this index information correspondence whether for hanging list item.The above-mentioned step of reaffirming, the stream forwarding list of having avoided data communications equipment setting up is judged by accident to hanging list item.
When described invalid key assignments (KEY) when being used, show that then this key assignments (KEY) still is effective stream forwarding list item this moment, therefore action schedule (DATA) list item that this key assignments (KEY) is corresponding is not the stream forwarding list item of hanging, so return execution in step S301, continues ergodic flow and transmits; When described invalid key assignments (KEY) when not being used, execution in step S304.
Step S304 confirms that corresponding action schedule (DATA) list item of invalid key assignments (KEY) that finds is the stream forwarding list item of hanging.Owing to invalid key assignments (KEY) in the stream forwarding list of the index information correspondence that detects stream forwarding list once more is not used, therefore this invalid key assignments (KEY) remains invalid, so corresponding action schedule (DATA) list item of this invalid key assignments (KEY) is the stream forwarding list item of hanging.
Step S305 reclaims action schedule (DATA) list item resource by force according to the index information of stream forwarding list.After corresponding action schedule (DATA) list item of confirming to find of invalid key assignments (KEY) is the stream forwarding list item of hanging, data communications equipment reclaims this action schedule of hanging (DATA) list item, thereby guaranteed the consistency of the DATA and the KEY of stream forwarding list, avoided the stream forwarding list resource leakage that list item causes of hanging of stream forwarding list.
The recovery method of above-mentioned stream forwarding list item, transmit by the timing ergodic flow, search key assignments invalid in the stream forwarding list (KEY) list item, after finding invalid key assignments (KEY) list item, determine whether action schedule (DATA) list item corresponding with this key assignments (KEY) list item is invalid stream forwarding list item, and invalid action schedule (DATA) list item reclaimed, thereby guaranteed the consistency of action schedule (DATA) list item and key assignments (KEY) list item of stream forwarding list, avoid the leakage of stream forwarding list resource, improved the reliability of the system of sending out based on circulation.
As shown in Figure 4, the retracting device for embodiment of the invention stream forwarding list item comprises:
Index information logging modle 42 is used for searching after module 41 finds the first invalid list item, writes down the index information of this stream forwarding list;
Hang list item determination module 43, be used for when second list item of the index information correspondence of the stream forwarding list of index information logging modle 42 record is effective, determining that according to the operating position of the first invalid list item second list item is the stream forwarding list item of hanging;
List item recycling module 44 is used for reclaiming described second list item of hanging according to the index information of stream forwarding list.
Wherein, hanging list item determination module 43 can comprise:
Determine submodule 432, be used for after judging that submodule 431 judges that this first invalid list item is not used yet, determining that second list item is the stream forwarding list item of hanging.
Wherein, searching module 41 can comprise:
Timer is provided with submodule 411, is used to be provided with timer, and when the timer time that is provided with arrived, notice was searched module 41 ergodic flows and transmitted.
In the above-described embodiments, when first list item was the action list item, second list item was the key assignments list item; Perhaps, when first list item was the key assignments list item, second list item was the action list item.
Above-mentioned module can be distributed in a device, also can be distributed in multiple arrangement.Above-mentioned module can be merged into a module, also can further split into a plurality of submodules.The retracting device of the stream forwarding list item that the embodiment of the invention proposes can be arranged in the data communications equipment, also can be used as an independent device and independently is provided with.
The retracting device of above-mentioned stream forwarding list item, searching module 41 transmits by ergodic flow, search invalid stream forwarding list item, searching after module 41 finds invalid stream forwarding list item, 44 pairs of invalid stream forwarding list items of list item recycling module reclaim, thereby guaranteed the consistency of the list item of stream forwarding list, avoided the leakage of stream forwarding list resource, improved the reliability of the system of sending out based on circulation, and realized simple, safe and reliable, can not impact main flow.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by hardware, also can realize based on such understanding by the mode that software adds necessary general hardware platform, technical scheme of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, module in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.
The invention described above embodiment sequence number is not represented the quality of embodiment just to description.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (8)
1. the recovery method of a stream forwarding list item is characterized in that, may further comprise the steps:
Ergodic flow is transmitted, and searches the first invalid list item according to the operating position of first list item, after finding the described first invalid list item, writes down the index information of described stream forwarding list;
When second list item of the index information correspondence of described stream forwarding list is effective, determine that according to the operating position of described invalid first list item described second list item is the stream forwarding list item of hanging;
Index information according to described stream forwarding list reclaims described second list item of hanging.
2. the recovery method of stream forwarding list item according to claim 1 is characterized in that described operating position according to the first invalid list item determines that described second list item is that the stream forwarding list item of hanging specifically comprises:
Judge whether the described first invalid list item that finds is used;
If the described first invalid list item is not used yet, determine that then described second list item is the stream forwarding list item of hanging.
3. the recovery method of stream forwarding list item according to claim 1 is characterized in that described ergodic flow is transmitted specifically and comprised:
Timer is set, when the timer time of described setting arrives, travels through described stream forwarding list.
4. the recovery method of stream forwarding list item according to claim 1 is characterized in that, when described first list item during for the action list item, described second list item is the key assignments list item; Perhaps,
When described first list item was the key assignments list item, described second list item was the action list item.
5. the retracting device of a stream forwarding list item is characterized in that, comprising:
Search module, be used for ergodic flow and transmit, search the first invalid list item according to the operating position of first list item;
The index information logging modle is used in the described module searches of searching writing down the index information of described stream forwarding list after the described first invalid list item;
Hang the list item determination module, be used for when second list item of the index information correspondence of the stream forwarding list of described index information logging modle record is effective, determine that according to the operating position of described invalid first list item described second list item is the stream forwarding list item of hanging;
The list item recycling module is used for reclaiming described second list item of hanging according to the index information of described stream forwarding list.
6. as the retracting device of stream forwarding list item as described in the claim 5, it is characterized in that the described list item determination module of hanging comprises:
Judge submodule, be used to judge described search module searches to the first invalid list item whether be used;
Determine submodule, be used for after described judgement submodule judges that the described first invalid list item is not used yet, determining that described second list item is the stream forwarding list item of hanging.
7. as the retracting device of stream forwarding list item as described in the claim 5, it is characterized in that the described module of searching comprises:
Timer is provided with submodule, is used to be provided with timer, when the timer time of described setting arrives, notifies the described module of searching to travel through described stream forwarding list.
8. as the retracting device of stream forwarding list item as described in the claim 5, it is characterized in that when described first list item during for the action list item, described second list item is the key assignments list item; Perhaps,
When described first list item was the key assignments list item, described second list item was the action list item.
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| CN2008100890510A CN101262435B (en) | 2008-04-16 | 2008-04-16 | A return method and device for stream forward items |
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| CN2008100890510A CN101262435B (en) | 2008-04-16 | 2008-04-16 | A return method and device for stream forward items |
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| CN101800707B (en) * | 2010-04-22 | 2011-12-28 | 华为技术有限公司 | Method for establishing stream forwarding list item and data communication equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1708141A (en) * | 2004-06-08 | 2005-12-14 | 华为技术有限公司 | Method for realeasing terminal resource in media gateway |
| CN1992644A (en) * | 2005-12-31 | 2007-07-04 | 中兴通讯股份有限公司 | Method of controlling address aging with medium access in virtual private LAN |
| CN101009661A (en) * | 2007-01-25 | 2007-08-01 | 华为技术有限公司 | Method and device for updating stream forward table content based on the stream forward |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1708141A (en) * | 2004-06-08 | 2005-12-14 | 华为技术有限公司 | Method for realeasing terminal resource in media gateway |
| CN1992644A (en) * | 2005-12-31 | 2007-07-04 | 中兴通讯股份有限公司 | Method of controlling address aging with medium access in virtual private LAN |
| CN101009661A (en) * | 2007-01-25 | 2007-08-01 | 华为技术有限公司 | Method and device for updating stream forward table content based on the stream forward |
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