CN101867518A - Message forwarding processing method, processing device and equipment for two-layer switching equipment - Google Patents
Message forwarding processing method, processing device and equipment for two-layer switching equipment Download PDFInfo
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Abstract
The invention discloses message forwarding processing method, processing device and equipment for two-layer switching equipment. The method comprises the following steps of: generating a message suppression instruction according to a data message forwarding parameter when a data message reported by a switching chip is received; sending the created message suppression instruction to the switching chip so as to block the switching chip reporting the data message containing the forwarding parameter; creating a forwarding table item according to the data message; and sending the created forwarding table item to the switching chip. The invention inhibits the switching chip from continuing to report the data message with the corresponding forwarding parameter through rapidly carrying out blocking processing on the reported data message, and thereby the repeated processing on the reported data message is avoided, and the occupation on the CPU resources of the two-layer switching equipment can be reduced.
Description
Technical field
The embodiment of the invention relates to two layer-switching technologies in the computer network communication, relates in particular to a kind of two-layer switching equipment message method for processing forwarding, processing unit and equipment.
Background technology
In internet network (Internet), the multimedia service that sends the multiple spot reception such as single-points such as video conference and Web TVs is becoming the important component part that information transmits, be the bandwidth resources that avoid waste, adopt the communication mode of multicasting technology more as this class business.Adopt multicasting technology, when the sender when a group of recipients sends data, only need the group address of data message with a reservation multicast group sent, have only the recipient of this multicast group of adding just can receive the data message of multicast.For the sender, data message only need send once just can send to all recipients, has alleviated the load of network and sender's burden greatly.
Data message is transmitted in network and need be finished by switching equipment and routing device.Switching equipment and routing device are served the second layer of Open System Interconnection (Open System Internetwork, be called for short OSI) classic network model and the 3rd layer, i.e. data link layer and network layer respectively.Three layers of routing device are responsible for transmitting data message between different networks; Two-layer switching equipment is responsible in consolidated network, normally transmits data message between the distinct device in local area network (LAN) or in the VLAN.
The high speed that traditional two-layer switching equipment mainly utilizes exchange chip to carry out data message in the Business Stream is transmitted, to the processing procedure of data message as shown in Figure 1.Each exchange chip 100 is made up of port one 10 and forwarding module 120.CPU 200 in the two-layer switching equipment generates according to protocol processes and transmits rule, and will transmit rule and be set to exchange chip 100 based on control flows and transmit with formation, exchange chip 100 is transmitted to distinct device with data message from corresponding port 110 according to transmitting directly by forwarding module 120 from port one 10 receiving data packets.Generally speaking, CPU 200 need not the deal with data message forwarding, only the application-specific integrated circuit (ASIC) (ApplicationSpecific Integrated Circuit is called for short ASIC) when exchange chip 100 in the time of can't handling some data message, just can report CPU 200 and handle.Generally can adopt multicast listener to find (Multicast Listener Discovery for the IPv6 multicast scenarios, abbreviation MLD) agreement is spied upon (Snooping) technology, MLD Snooping technology is realized by the corresponding module 210 of spying upon among the CPU 200, establishment according to protocol interaction triggering multicast forwarding list item generates a part of transmitting rule as CPU 200.For the multicast traffic stream that can't create the multicast forwarding list item, its data message can directly be abandoned by exchange chip 100.
Owing to can't create the problem that the multicast forwarding list item is dropped by MLD Snooping, prior art proposes a solution in order to avoid multicast traffic stream, and its handling process as shown in Figure 2.After data message enters the forwarding module 120 of exchange chip 100,, then this data message is sent to CPU 200 and handles if forwarding module 120 can't find corresponding list item in transmitting.CPU 200 after receiver module 220 is received data message, through processing module 230 carry out some bases, with the irrelevant processing of multicast after, send to and spy upon module 210; Spy upon module 210 and set multicast forward table to exchange chip 100 according to multicast data flow, this multicast data flow follow-up data message will no longer report CPU 200 to handle.
But, in realizing process of the present invention, the inventor finds that there is following defective in above-mentioned technology: two-layer switching equipment is to carry out the equipment of forwarding at a high speed in local area network (LAN), the message transferring speed that exchange chip is realized with example, in hardware is far above the processing speed of CPU, with being connected speed and can reaching gigabit per second or hundred MBPSs usually of local area network (LAN); And in such scheme, the data message that reports need could create being applicable to transmitting of exchange chip through the processing of CPU; In transmitting the process of successfully creating and be set to exchange chip, have the data message that can't inquire forwarding-table item in a large number and be sent to CPU and handle, CPU is through determining whether abandon after necessary the processing; In the nondeterministic network environment, the mass data message may cause cpu resource excessively to be taken, and can't respond normal service request, thereby causes systemic breakdown.
Summary of the invention
The invention provides a kind of two-layer switching equipment with message method for processing forwarding, processing unit and equipment,, can reduce again CPU is handled taking of resource to realize both having improved the reliability of data message forwarding.
The embodiment of the invention provides a kind of two-layer switching equipment message method for processing forwarding, comprising:
When receiving the data message that exchange chip reports, produce message according to the retransmitting paramater of described data message and suppress instruction;
The described message of creating is suppressed instruction be issued to described exchange chip, report to block the data message that described exchange chip will comprise described retransmitting paramater;
Create forwarding-table item according to described data message, and the described forwarding-table item that will create is issued to described exchange chip.
The embodiment of the invention provides a kind of two-layer switching equipment to transmit processing unit with message, comprising:
Receiver module is used to receive the data message that exchange chip reports;
The blocking-up module, link to each other with described receiver module, be used for producing message and suppress instruction, and the described message that will create suppresses to instruct and be issued to described exchange chip, report to block the data message that described exchange chip will comprise described retransmitting paramater according to the retransmitting paramater of described data message;
The list item creation module links to each other with described receiver module, be used for creating forwarding-table item according to described data message, and the described forwarding-table item that will create is issued to described exchange chip.
The embodiment of the invention also provides a kind of two-layer switching equipment, comprises exchange chip and CPU, it is characterized in that: comprise among the described CPU that two-layer switching equipment provided by the invention transmits processing unit with message; Receiver module, blocking-up module that described message is transmitted in the processing unit link to each other with described exchange chip respectively with the list item creation module.
Two-layer switching equipment provided by the invention message method for processing forwarding, processing unit and equipment, carry out blocking processing fast by the data message that will report, suppress exchange chip and continue to report data message with corresponding retransmitting paramater, avoided reprocessing thus, can reduce taking the two-layer switching equipment cpu resource to the reported data message.
Description of drawings
Fig. 1 is the structural representation of a kind of two-layer switching equipment in the prior art;
Fig. 2 is the structural representation of another kind of two-layer switching equipment in the prior art;
The two-layer switching equipment that Fig. 3 provides for the embodiment of the invention one flow chart of message method for processing forwarding;
The structural representation of the two-layer switching equipment of the message method for processing forwarding carrying out the embodiment of the invention one and provide is provided Fig. 4;
The two-layer switching equipment that Fig. 5 provides for the embodiment of the invention two flow chart of message method for processing forwarding;
The two-layer switching equipment that Fig. 6 provides for the embodiment of the invention three is transmitted the structural representation of processing unit with message.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Embodiment one
The two-layer switching equipment that Fig. 3 provides for the embodiment of the invention one flow chart of message method for processing forwarding, this method can be carried out by the CPU of two-layer switching equipment, comprises the steps:
In the process of above-mentioned CPU deal with data message, producing message suppresses to instruct the order with step 330 not limit, execution that can be separate, promptly can produce message suppress instruction before, in or afterwards, create forwarding-table item according to data message.
After CPU is issued to exchange chip with the message inhibition instruction of creating, can also comprise by CPU and initiatively cancel the operation that message suppresses instruction, be that CPU stores the message inhibition instruction of creating, and behind setting-up time, the message inhibition instruction of storage cancelled from exchange chip.
Message suppresses instruction not only can be cancelled by the instruction that CPU initiatively initiates to cancel, and also can cancel automatically in other cases, for example cancels automatically when outbound port identifies conventional forwarding-table item when exchange chip receives having of CPU establishment.So-called setting-up time can be set by the time that estimation CPU creates conventional forwarding-table item, and, usually can not transmit all the time owing to have the message flow of identical retransmitting paramater, therefore cancellation message inhibition instruction can discharge the exchange chip storage or carry out the shared time of this instruction behind setting-up time.
The method of present embodiment can be carried out by two-layer switching equipment shown in Figure 4, but it should be noted: the embodiment of the invention is not limited to be carried out by the two-layer switching equipment of this structure.
Generally comprise exchange chip 100 and CPU 200 in the two-layer switching equipment, comprise a plurality of port ones 10 that can the transceive data message in the exchange chip 100, and carry out and transmit the forwarding module of operating 120, CPU200 comprises the receiver module 220 of receiving data packets, carry out the processing module 230 that data message is handled, and spy upon module 210 what multicast data message carried out that the multicast forwarding list item creates.The processing that 230 pairs of data messages of processing module are done can be understood as any processing operation that can carry out according to protocols having.Further increased blocking-up module 240 in the present embodiment on the basis of existing two-layer switching equipment, blocking-up module 240 links to each other with the forwarding module 120 of receiver module 220 and each exchange chip 100.Processing module 230 can directly link to each other with receiver module 220, and the situation for the processing of data message is just carried out after 240 operations of blocking-up module can be arranged on blocking-up module 240 between receiver module 220 and the processing module 230.
The detailed process of carrying out said method based on two-layer switching equipment shown in Figure 4 is as follows: the data message of Business Stream enters from the port one 10 of exchange chip 100, sends to forwarding module 120 and handles; Forwarding module 120 is inquired about according to transmitting of storage in the exchange chip 100, generally be to inquire about according to the parameters such as destination address of data message, obtain the corresponding output port sign, if can inquire corresponding output port, then 110 E-Packet from the corresponding port, carry out normal forwarding process,, then this data message is reported CPU 200 and handle if can't inquire corresponding forwarding-table item; When the receiver module 220 of CPU 200 received the data message that exchange chip 100 reports, data message at first can be paid blocking-up module 240 and handle; Blocking-up module 240 produces message according to the retransmitting paramater of data message and suppresses instruction, and the message of creating is suppressed instruction is issued to exchange chip 100; Get access to the exchange chip 100 of message inhibition instruction, when continuing to receive the data message that can't inquire forwarding-table item, can judge whether this data message comprises that message suppresses the retransmitting paramater of instruction appointment, if, then blocking-up reports CPU 200 with this data message, if not, then execution reports operation normally.Produce in the process that messages suppress instruction the processing module 230 of CPU 200 and spy upon module 210 and can carry out the establishment of based process and multicast forwarding list item to this data message according to former protocols having regulation in blocking-up module 240.
Adopt the technical scheme of present embodiment, for the data message that needs CPU to handle, can be at first through the processing of blocking-up module, the blocking-up module is indicated reporting of exchange chip blocking-up corresponding data message immediately.Need the data message of blocking-up to discern with retransmitting paramater, the form of retransmitting paramater can have multiple, so long as can represent the common parameters of the data message that needs blocking-up to get final product.For example, when needing blocking-up to belong to the data message of same multicast data flow, retransmitting paramater can be a multicast group address; When needing the data message of the same attack source of blocking-up, retransmitting paramater can be a source address.Under the perfect condition, just can suppress reporting of follow-up corresponding data message soon when receiving first data message, protect the communication bandwidth between exchange chip and the CPU excessively not taken.And just can create forwarding-table item according to first data message, thereby the follow-up data message that receives can correctly be transmitted by exchange chip, avoid the reprocessing data message to create of the waste of redundant forwarding-table item resource.
The technical scheme of present embodiment goes for the disposition to various data messages, the processing speed of CPU will be far below the forwarding speed of exchange chip, before CPU finishes normal forwarding-table item establishment, the present embodiment technical scheme can be blocked the follow-up data message that reports fast, suppress effectively in a large number to the data message repeat report and handle.
The advantage of present embodiment when handling multicast data message is particularly remarkable, even the multicast data flow that normal multicast application produces, behind reported data message first, because after CPU receives first data message, also to pass through some other logical process, just be sent to thereafter and spy upon module generation multicast forwarding list item.Receive that from CPU data message generates forwarding-table item has this multicast data flow in this short time mass data message and sent to CPU to spying upon module, causes some data messages to be deposited in the high-speed buffer of CPU.And these data messages alluvial not only having increased two-layer switching equipment EMS memory occupations, and waste CPU the processing resource.Because CPU just can create the multicast forwarding list item as long as obtain a data message of this multicast data flow.Adopt technique scheme can effectively avoid CPU that a large amount of multicast data messages are repeatedly handled, thus can offloading the CPU, avoid the wasting of resources, the functional reliability of cpu system is improved, can not influence the processing of regular traffic.Technique scheme can effectively prevent multicast traffic stream attack two-layer switching equipment, and the normal multicast data flow for producing the multicast forwarding list item can directly not abandon yet, and has therefore improved the reliability that message is transmitted.
Embodiment two
The two-layer switching equipment that Fig. 5 provides for the embodiment of the invention two flow chart of message method for processing forwarding, the method for present embodiment specifically comprises the steps:
The outbound port that step 520, CPU should suppress forwarding-table item is set to sky;
Present embodiment suppresses instruction to suppress forwarding-table item as message, identifies as retransmitting paramater with destination address and Virtual Local Area Network.Under the situation of multicast forwarding, multicast group address is destination address, is designated as G.VLAN ID is V, and the value that can give tacit consent on the two-layer switching equipment that does not relate to VLAN V is changed to " 0 ", so that (G, two tuples V) are as retransmitting paramater.Suppressing forwarding-table item also is a kind of forwarding-table item, can join in the transmitting of exchange chip.When exchange chip carries out forwarding-table item when inquiry receiving the follow-up data message, if inquire the inhibition forwarding-table item, then corresponding output port be a sky, does not promptly have downstream outbound port information.At this moment, this class data message both need not to report CPU to handle owing to inquiring forwarding-table item, so again because outbound port is transmitted for empty need not, promptly reach the effect of dropping packets, had therefore played the effect that data message reports that suppresses.Create correct forwarding-table item up to CPU, upgraded and suppress forwarding-table item, replenished correct outbound port sign, can finish follow-up normal forwarding operation.
After the inhibition forwarding-table item that the blocking-up module of CPU will be created is issued to exchange chip, CPU can also cancel message and suppress instruction from exchange chip, present embodiment adopts when suppressing forwarding-table item as message inhibition instruction, and the blocking-up module of CPU specifically can be carried out following step after step 530:
The inhibition forwarding-table item that the blocking-up module of step 550, CPU will be created is stored, and behind setting-up time, and the inhibition forwarding-table item of storage is quoted deletion in exchange chip, has promptly cancelled message and has suppressed instruction.
In actual applications, each control module of CPU as blocking module and spying upon the forwarding-table item that exchange chip was created and be handed down to module, is actually and has set up the adduction relationship of this control module to the forwarding-table item in this exchange chip.When certain control module is deleted quoting of certain forwarding-table item in this exchange chip, exchange chip can judge whether that also there is adduction relationship in this forwarding-table item with other modules, if having, then exchange chip is only deleted the adduction relationship with this control module, if do not have, then delete this forwarding-table item.
In the present embodiment, if spy upon the forwarding-table item that module has determined to have clear and definite outbound port information, after then issuing this forwarding-table item, also set up with exchange chip in the quoting of the inhibition forwarding-table item set up, because retransmitting paramater unanimities such as destination address are same forwarding-table item so spy upon the forwarding-table item of module and blocking-up module creation.The blocking-up module only can be deleted the blocking-up module to the quoting of this forwarding-table item to the deletion of forwarding-table item, and can not delete this forwarding-table item.In time the deletion forwarding-table item can be avoided transmitting too much taking of resource.
The adaptability of present embodiment technical scheme is strong, cost is low, only uses the multicast forward table resource of exchange chip to realize, does not require other abilities of exchange chip, is easy to be generalized on the two-layer switching equipment that uses on various two layers of exchange chip.Only use the multicast forward table resource to realize, other services outside the multicast that the equipment that then can not influence when a large amount of multicast data flows are attacked provides.The technical scheme of present embodiment particularly is applicable to two layers of this low and middle-end equipment of exchange chip, can consider that it is with low cost, function singleness, can't carry out the characteristics of complex logic.
With respect to prior art, the technical scheme of present embodiment has many advantages: 1) than adopting Access Control List (ACL) (Access Control List, be called for short ACL) wait and carry out static state and control, avoid illegal multicast data flow to enter the technical scheme of multicast processing logic, present embodiment can not consume more ACL resource, owing to be not static the setting, so to the inhibition flexible operation of data message, the bigger static configuration workload that can not produce; 2) than the scheme of the multicast message that reports being unified rate limit, the technical scheme of present embodiment can guarantee normally reporting of the data message that need report, and can directly not abandon and causes some normal multicast data flow can't obtain the multicast forwarding list item.
Embodiment three
The two-layer switching equipment that Fig. 6 provides for the embodiment of the invention three is transmitted the structural representation of processing unit with message, and this processing unit can be the CPU of two-layer switching equipment, also can be the functional module group that is integrated among the CPU.This message is transmitted processing unit and is comprised receiver module 220, blocking-up module 240 and list item creation module 250.Wherein, receiver module 220 is used to receive the data message that exchange chip 100 reports; Block module 240 and link to each other, be used for producing message inhibition instruction, and the message inhibition instruction of creating is issued to exchange chip 100, will comprise that to block exchange chip 100 data message of retransmitting paramater reports according to the retransmitting paramater of data message with receiver module 220; List item creation module 250 links to each other with receiver module 220, can be to link to each other with receiver module 220 by blocking-up module 240, is used for creating forwarding-table item according to data message, and the forwarding-table item of creating is issued to exchange chip 100.List item creation module 250 specifically can be the processing module 230 of structure shown in Fig. 4 and/or spy upon module 210 etc.
On the basis of technique scheme, this blocking-up module 240 specifically can comprise: instruction creating unit 241 and port are provided with unit 242.Wherein, instruction creating unit 241 is used for obtaining destination address and VLAN ID from data message, and destination address and VLAN ID are created the inhibition forwarding-table item as message inhibition instruction as retransmitting paramater; Port is provided with the outbound port that unit 242 is used for suppressing forwarding-table item and is set to sky.
Blocking-up module 240 can also comprise list item delete cells 243, is used for deleting quoting the inhibition forwarding-table item of exchange chip.
The message that present embodiment provides is transmitted the two-layer switching equipment message method for processing forwarding that processing unit can be carried out any embodiment of the present invention to be provided, possesses corresponding functional modules, can avoid the reprocessing of CPU to the data message, the live load of CPU can be alleviated, and taking can be reduced effective bandwidth between exchange chip and the CPU.
The embodiment of the invention also provides a kind of two-layer switching equipment, comprises exchange chip and CPU.Comprise among the CPU that the two-layer switching equipment that any embodiment of the present invention provides transmits processing unit with message; Receiver module, blocking-up module that this message is transmitted in the processing unit link to each other with exchange chip respectively with the list item creation module.
The solution of the present invention can realize based on IPv4 or IPv6 agreement, be particularly useful for supporting the two-layer switching equipment of MLDSnooping technology.Message provided by the invention is transmitted processing scheme can block the data message that repeats to report effectively fast; and the forwarding-table item that can avoid carrying out repeated and redundant is created; alleviate the live load of CPU, also protected the communication bandwidth resource between exchange chip and the CPU.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a two-layer switching equipment message method for processing forwarding is characterized in that, comprising:
When receiving the data message that exchange chip reports, produce message according to the retransmitting paramater of described data message and suppress instruction;
The described message of creating is suppressed instruction be issued to described exchange chip, report to block the data message that described exchange chip will comprise described retransmitting paramater;
Create forwarding-table item according to described data message, and the described forwarding-table item that will create is issued to described exchange chip.
2. message method for processing forwarding according to claim 1 is characterized in that: produce message suppress instruction before, in or afterwards, create forwarding-table item according to described data message.
3. message method for processing forwarding according to claim 1 is characterized in that, instructs according to the retransmitting paramater generation message inhibition of described data message to comprise:
From described data message, obtain destination address and VLAN ID, described destination address and VLAN ID are created the inhibition forwarding-table item as described message inhibition instruction as retransmitting paramater;
The outbound port of described inhibition forwarding-table item is set to sky.
4. message method for processing forwarding according to claim 1 and 2 is characterized in that, after the described message inhibition instruction that will create is issued to described exchange chip, also comprises:
The described message of creating is suppressed instruction store, and behind setting-up time, the described message inhibition instruction of storage is cancelled from described exchange chip.
5. message method for processing forwarding according to claim 3 is characterized in that, after the described message inhibition instruction that will create is issued to described exchange chip, also comprises:
The described message of creating is suppressed instruction store, and behind setting-up time, the described message inhibition instruction of storage is cancelled from described exchange chip.
6. message method for processing forwarding according to claim 5 is characterized in that, the described described message that will store suppresses to instruct to cancel from described exchange chip to comprise:
The described inhibition forwarding-table item of storage is quoted deletion in described exchange chip.
7. a two-layer switching equipment is transmitted processing unit with message, it is characterized in that, comprising:
Receiver module is used to receive the data message that exchange chip reports;
The blocking-up module, link to each other with described receiver module, be used for producing message and suppress instruction, and the described message that will create suppresses to instruct and be issued to described exchange chip, report to block the data message that described exchange chip will comprise described retransmitting paramater according to the retransmitting paramater of described data message;
The list item creation module links to each other with described receiver module, be used for creating forwarding-table item according to described data message, and the described forwarding-table item that will create is issued to described exchange chip.
8. message according to claim 7 is transmitted processing unit, it is characterized in that described blocking-up module comprises:
The instruction creating unit is used for obtaining destination address and VLAN ID from described data message, and described destination address and VLAN ID are created the inhibition forwarding-table item as described message inhibition instruction as retransmitting paramater;
Port is provided with the unit, and the outbound port that is used for described inhibition forwarding-table item is set to sky.
9. message according to claim 8 is transmitted processing unit, it is characterized in that described blocking-up module also comprises:
The list item delete cells is used for deleting quoting the described inhibition forwarding-table item of described exchange chip.
10. a two-layer switching equipment comprises exchange chip and CPU, it is characterized in that: comprise among the described CPU that the arbitrary described two-layer switching equipment of claim 7～9 transmits processing unit with message; Receiver module, blocking-up module that described message is transmitted in the processing unit link to each other with described exchange chip respectively with the list item creation module.
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| CN105429881A (en) * | 2014-09-23 | 2016-03-23 | 杭州迪普科技有限公司 | Multicast message forwarding method and device |
| CN105959242A (en) * | 2015-08-21 | 2016-09-21 | 杭州迪普科技有限公司 | Message sending method and device |
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| CN102014064A (en) * | 2010-12-07 | 2011-04-13 | 中兴通讯股份有限公司 | Method and device for forwarding messages based on Linux system |
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Application publication date: 20101020 |