CN1933451A - Interplate communicating method and interface plate - Google Patents
Interplate communicating method and interface plate Download PDFInfo
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- CN1933451A CN1933451A CNA2006101500946A CN200610150094A CN1933451A CN 1933451 A CN1933451 A CN 1933451A CN A2006101500946 A CNA2006101500946 A CN A2006101500946A CN 200610150094 A CN200610150094 A CN 200610150094A CN 1933451 A CN1933451 A CN 1933451A
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Abstract
A method for carrying out communication between plates includes deleting redundant data block off when a data packet is received and combining necessary data blocks to be compressed packet head being combined with data body to form compressed data packet then sending it to outgoing interface plate, setting up redundant data block according to compressed packet head after compressed data packet is received, combining necessary data block with redundant data block to form restoration packet head and combining restoration packet head with data body to form restoration data packet. The device used for realizing said method is also disclosed.
Description
Technical field
The present invention relates to a kind of interplate communication method, relate in particular to a kind of interplate communication method that can improve actual effective bandwidth utilance that is applied to carry out in the distributed apparatus communication between plates, and be applied to the interface board that can reach effect same in the distributed apparatus.
Background technology
Distributed apparatus as distribution router etc., has a plurality of interface boards, and each interface board all has several interfaces.When work, each interface board can be finished the forwarding of packet voluntarily, also can cooperate with other interface boards and finish the forwarding of packet.Therefore, the pass-through mode of distributed apparatus can be divided into two kinds, and a kind of is to transmit in the plate, and another kind is to transmit between plate.
As shown in Figure 1, existing distributed apparatus mainly comprises: mainboard 10, and slave board 20, several distributed interface boards have some interfaces on each interface board, and mainboard 10, and slave board 20 and several interface boards all are connected on the system bus 30.Transmit in the plate and be meant the pass-through mode that packet is transmitted between the distinct interface on the interface board, as the data packet transmission direction 61 among Fig. 1, send into forwarding unit from the interface 53 of interface board 43, after transmitting, send from the interface 54 of same interface board 43, finish in the plate and transmit; Transmit between plate and be meant the pass-through mode that packet is transmitted between the interface on the distinct interface plate, as the data packet transmission direction 62 among Fig. 1, send into forwarding unit from the interface 51 of interface board 41, after transmitting, send from the interface 52 of another interface board 42, finish between plate and transmit.
The defective of prior art is: between plate in the pass-through mode, the packet that is forwarded is except the data volume of packet itself, also need to carry some additional informations, these additional informations as a packet, are forwarded to another interface board from an interface board with the data volume that will transmit.For example, when using Free BSD (Free Berkeley Systems Distribution) network operating system, this packet is also referred to as MBUF (Memory Buffers).MBUF comprises MBUF head and data volume two parts.Wherein, data volume is used for depositing the data message that will transmit, and the MBUF head is used to deposit additional contextual information, mainly comprises two kinds:
1, the data that need preserve in order to carry out subsequent treatment.For example, in IP input (IP_Input) process, (Network Address Translation, be called for short: in the time of NAT), the original ip address of preservation can be replaced by new IP address, has so just lost original IP address carrying out Network address translators.In order still to access the preceding original ip address of translation in subsequent treatment, the way of prior art is that the IP address that this is original is kept in the MBUF head.
2, in order in each processing procedure, to carry out the parameter transmission.For example, in ether input (Eth_Input) process, bottom layer driving software can pass over the interface index number (ifIndex) of incoming interface, in order to make follow-up each processing procedure also can obtain this information, the way of prior art is to call in function interface, or this information is recorded in the MBUF head.Because MBUF follows whole forwarding process, so second method is more convenient, uses also more extensive.
MBUF head and data volume two parts can be continuous physically or discontinuously arranged.When transmitting between plate, MBUF head and data volume all will be forwarded to another interface board from an interface board, but sometimes, need the data volume amount of information of forwarding very little, and by contrast, the length of MBUF head is but very big, thereby when causing transmission small data body, actual effective bandwidth utilance is very low.For example, suppose that a MBUF head length degree is 256 bytes, needing the small data body length of transmission is 64 bytes, and at this moment, actual effective bandwidth utilance only is 64/ (256+64)=20%.That is, if the slave board bus bandwidth is 10G, the so actual bandwidth of effectively utilizing only is 2G, and visible actual effective bandwidth utilance is very low.
Summary of the invention
The objective of the invention is to, a kind of interplate communication method and interface board are provided, make when between plate, carrying out data packet transmission, improve actual effective bandwidth utilance.
For achieving the above object, the invention provides a kind of interplate communication method, comprising:
After the incoming interface plate received a packet, the redundant data block delete with in the packet header of this packet was combined into compressed header packet with the essential data block in the packet header, and the data volume in compressed header packet and the packet is combined into compressed data packets;
Compressed data packets is sent to the outgoing interface plate;
After the outgoing interface plate receives compressed data packets, create the redundant data piece, essential data block and redundant data piece are combined into recovery packet header, the data volume that recovers in packet header and the compressed data packets is combined into recovery data packets according to compressed header packet.
For achieving the above object, the invention provides a kind of interface board, comprising:
The data block processing module is used for when sending or receive packet, deletion or establishment redundant data piece;
The data packet group compound module is used for when sending or receive packet, and the essential data block that will come from the data block processing module is combined into compressed header packet, and the data volume in this compressed header packet and the packet is combined into compressed data packets; Perhaps, the essential data block and the redundant data piece that will come from the data block processing module are combined into recovery packet header, and the data volume that will recover in packet header and the compressed data packets is combined into recovery data packets.
In the present invention, because actual packet header of carrying out data packets for transmission between plate only comprises essential data block, therefore, significantly reduced the length of header data, thereby improved actual effective bandwidth utilance.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is the pass-through mode schematic diagram of existing distributed apparatus;
Fig. 2 is the embodiment of the invention 1 a described interplate communication method flow chart;
Fig. 3 is an IP repeating process example schematic in the embodiment of the invention 1;
Fig. 4 is the embodiment of the invention 2 described interplate communication method flow charts;
Fig. 5 is the embodiment of the invention 3 described interplate communication method flow charts;
Fig. 6 is the distributed apparatus structural representation with the embodiment of the invention 4 described interface boards;
Fig. 7 is the distributed apparatus structural representation with the embodiment of the invention 5 described interface boards.
Embodiment
Embodiment 1
Present embodiment provides a kind of and has compressed by the packet header to packet, to reduce header data length, improves the interplate communication method of actual effective bandwidth utilance.As shown in Figure 2,
After step 101, incoming interface plate receive a packet, with the redundant data block delete in the packet header.Wherein, the redundant data piece is meant in the packet header and need carry out data block transmitted between plate.For example, establish the packet header described in this step and be meant the MBUF head, this packet header comprises A, B, C, D, five data blocks of E.As shown in Figure 3, in the IP repeating process, comprise ether input (Eth_Input), IP input (IP_Input), preceding (IP_Forward), IP output (IP_Output) and the ether output a plurality of processing procedures such as (Eth_Output) of changeing of IP.Above-mentioned processing procedure need be provided with the data block in the MBUF head or read, to realize the parameter transmission.Specifically as can be seen from Figure 3, data block A only needs to be provided with or to read in input process, data block B only needs to be provided with or to read in output procedure, though data block D is provided with in input process, but in output procedure, be reset again, in fact, the content that is arranged in input process among the data block D is not utilized in output procedure.Therefore, the content among data block A, B and the D does not need to carry out transmitting between plate, and data block A, B and D are deleted from the MBUF head as the redundant data piece.
In the described step of present embodiment,, therefore, significantly reduced the length of header data because actual packet header of carrying out data packets for transmission between plate only comprises essential data block.For example, the MBUF head length is 256 bytes, and the compressed header packet length after the compression is 64 bytes, and then actual effective bandwidth utilance can reach 64/ (64+64)=50%, compares with 20%, and actual effective bandwidth utilance improves greatly.
It is to be noted, the MBUF packet of present embodiment when using Free BSD network operating system is that example is illustrated, but packet for the other types in the other system, as long as use this method with the redundant data block delete in the packet header, it is not carried out transmitting between plate, can play the technique effect that improves actual effective bandwidth utilance, therefore the kind for operating system and packet does not limit.
In addition, also it is pointed out that, in the step 101, before with the redundant data block delete in the packet header of packet, also the packet of receiving should be saved as backup data package if a packets need is transmitted to a plurality of outgoing interface plates.According to this incoming interface plate and other outgoing interface plates to the setting of the data block in the packet header with read situation, deletion redundant data piece from backup data package, and then proceed to transmit between plate according to the described method of present embodiment.
Embodiment 2
Transmission method needs the CPU of incoming interface plate and outgoing interface plate to participate in calculating between the plate described in the embodiment 1, and as in the step 1, the CPU of incoming interface plate need read the packet that receives from internal memory, then with the redundant data block delete in the packet header.Correspondingly, in the step 104, the CPU of outgoing interface plate need copy the recovery data packets that generates in the internal memory to, and then mails to the corresponding interface.Therefore will take the computing capability of CPU, present embodiment has proposed a kind of interplate communication method that addresses the above problem.As shown in Figure 4,
After step 201, incoming interface plate receive a packet, with the redundant data block delete in the packet header.With embodiment 1 described MBUF head is example, promptly deletes redundant data piece A, B and D.
In the described step of present embodiment, because essential data block has been carried out adjacent arrangement, therefore when data packet transmission, only need disposable appointment relative address, promptly can finish the transmission of packet, and needn't all carry out the operation of memory copying at every turn, therefore, when improving actual effective bandwidth utilance, can also reduce the occupancy of CPU, be applicable to the pci bus class distributed apparatus that can carry out the internal memory tracing.
It is to be noted, the MBUF packet of present embodiment when using Free BSD network operating system is that example is illustrated, but packet for the other types in the other system, as long as use this method with the redundant data block delete in the packet header, and the necessary data bag carried out adjacent arrangement, can play and improve actual effective bandwidth utilance, reduce the technique effect of CPU usage, therefore the kind for operating system and packet does not limit.
In addition, it is pointed out that also step 202,203 and 204 order are not what fix.Also can earlier essential data block be combined into compressed header packet, again it be carried out adjacent arrangement, perhaps earlier redundant data piece obligate information is written in the compressed header packet, again essential data block be carried out adjacent arrangement.As long as finally make essential data block and the redundant data piece obligate information that includes adjacent arrangement in the compressed header packet, can produce a desired effect, it all is feasible taking different orders.
In addition, also it is pointed out that, in the step 201, before with the redundant data block delete in the packet header of packet, also the packet of receiving should be saved as backup data package if a packets need is transmitted to a plurality of outgoing interface plates.According to this incoming interface plate and other outgoing interface plates to the setting of the data block in the packet header with read situation, deletion redundant data piece from backup data package, and then proceed to transmit between plate according to the described method of present embodiment.
Embodiment 3
Data block in the packet header of packet mostly produces at different business demands, because class of business is varied, thereby causes data block also to have a lot, has therefore increased the data length in packet header.At a time, not all business all is activated operation but in fact.In order further to improve actual effective bandwidth utilance, present embodiment provides a kind of configuration status based on business, the method for compressed header packet.As shown in Figure 5,
After step 301, incoming interface plate receive a packet, with the redundant data block delete in the packet header.With embodiment 1 described MBUF head is example, because data block A only needs to be provided with or to read in input process, data block B only needs to be provided with or to read in output procedure, though data block D is provided with in input process, but in output procedure, be reset again, in fact, the content that is arranged in input process among the data block D is not utilized in output procedure.Therefore, the content among data block A, B and the D does not need to carry out transmitting between plate, promptly deletes redundant data piece A, B and D.
Step 305 after the outgoing interface plate receives compressed data packets, is called the corresponding business transfer function by Hook Function, inquires not log-on data piece; Create the redundant data piece according to the not log-on data piece that starts essential data block and inquire in the compressed header packet; The redundant data piece that starts essential data block, the not log-on data piece that inquires and establishment in the compressed header packet is combined into recovery packet header, and then the data volume that will recover in packet header and the compressed data packets is combined into recovery data packets, thereby finishes the transmission to a packet.For example, in last example, the not log-on data piece that is inquired by professional transfer function is data block E, create redundant data piece A, B and D based on essential data block C in the compressed header packet and the not log-on data piece E that inquires, data block A, B, C, D and E are combined into recovery packet header, and then are combined into recovery data packets with data volume.
In the described step of present embodiment,, thereby further improved actual effective bandwidth utilance because the log-on data piece does not carry out transmitting between plate.For example, in last example, if the size of data block C and E is respectively 32 bytes, then actual effective bandwidth utilance can reach 64/ (64+32)=67%.
It is to be noted in addition, if having started essential data block has a plurality of, and be distributed in non-conterminous memory address, then still can be according to the described method of the step 202 among the embodiment 2, compressed data packets is being mail between the outgoing interface plate, a plurality of essential data block that started are carried out adjacent arrangement, be about to non-conterminous a plurality of essential data block that started and on memory space, be arranged adjacent in together.For the distributed apparatus that connects with mutual bus mode such as PCI-X or PCI-E, when the tracing internal memory, be the disposable appointment relative address of the startup essential data block of adjacent arrangement, with the compressed data packets tracing in the internal memory of outgoing interface plate, thereby improve the utilance of CPU.
In addition, also it is pointed out that, in the step 301, before with the redundant data block delete in the packet header of packet, also the packet of receiving should be saved as backup data package if a packets need is transmitted to a plurality of outgoing interface plates.According to this incoming interface plate and other outgoing interface plates to the setting of the data block in the packet header with read situation, deletion redundant data piece from backup data package, and then proceed to transmit between plate according to the described method of present embodiment.
Embodiment 4
Present embodiment provides a kind of interface board structure that can improve the actual effective bandwidth utilance of communication between plates.As shown in Figure 6,, comprising for having the distributed apparatus schematic diagram of the described interface board of present embodiment: mainboard 10, slave board 20, several interface boards such as interface board 41,42 all are connected on the system bus 30; Each interface board is an example with interface board 41, is provided with interface 51 and waits several interfaces, and data block processing module 411, data packet group compound module 421, the bus interface 431 that links to each other with system bus 30 is used for the transceive data bag.Wherein, data block processing module 411, data packet group compound module 421, bus interface 431 and several interfaces all are connected on the plate internal bus 441.Interface board 42 and other interface boards are identical with interface board 41 structures.Below need carry out with interface 51 that data packet transmission is an example between plate to interface 52, the operation principle of this equipment is described.
After the interface 51 of interface board 41 is received a packet, data block processing module 411 is with the redundant data block delete in the packet header, if this packet also will be transmitted to other outgoing interface plates, before deletion redundant data piece, also the packet of receiving to be saved as backup data package.Then essential data block is sent to data packet group compound module 421 by plate internal bus 441; Perhaps,, can also carry out adjacent arrangement, essential data block and redundant data piece obligate information after arranging are sent to data packet group compound module 421 by plate internal bus 441 essential data block in order to save the occupancy of CPU.Data packet group compound module 421 will come from the synthetic compressed header packet of information sets of data block processing module 411, and this compressed header packet and the data volume that comes from the packet of plate internal bus 441 are combined into compressed data packets.Compressed data packets after data packet group compound module 421 will make up sends to bus interface 431 by plate internal bus 441, and then send to mainboard 10 by system bus 30, send to interface board 42 by mainboard 10, concrete sending method can be transmitted or transparent transmission by equipment such as mainboards according to existing routing forwarding technology.
After interface board 42 receives the compressed data packets that comes from interface board 41 by bus interface 432, data block processing module 412 is created the redundant data piece according to compressed header packet, if the essential data block in this compressed header packet is not carried out adjacent arrangement, then create the redundant data piece according to the current sequence of positions of essential data block; If the essential data block in this compressed header packet has been carried out adjacent arrangement, changed original sequence of positions, then create the redundant data piece according to the redundant data piece obligate information in the compressed header packet.The redundant data piece of this establishment is sent to data packet group compound module 422 by plate internal bus 442.Data packet group compound module 422 is with this redundant data piece and come from essential data block in the compressed header packet of bus 442 between plate and be combined into and recover packet header, and then the data volume that will recover in packet header and the compressed data packets is combined into recovery data packets, and this recovery data packets sent to interface 52 by plate internal bus 442, thereby finish transmission course to a packet.
In the described step of present embodiment,, therefore, significantly reduced the length of header data, thereby improved actual effective bandwidth utilance because actual packet header of carrying out data packets for transmission between plate only comprises essential data block and a spot of redundant data piece obligate information.
Embodiment 5
The described interface board of present embodiment has increased the function call module on embodiment 4 bases.With interface board 41 is example, has increased function call module 511, and function call module 511 also is connected on the plate internal bus 441.Interface board 42 and other interface boards all have identical structure.Still need carry out with interface 51 below that data packet transmission is an example between plate to interface 52, the operation principle of this equipment is described.
After the interface 51 of interface board 41 was received a packet, data block processing module 411 was the redundant data block delete in the packet header, and essential data block is sent to function call module 511 by plate internal bus 441.Function call module 511 is called the professional transfer function that sets in advance by Hook Function, inquires not start professional pairing not log-on data piece, and it is deleted from essential data block.Remaining is started essential data block sent to data packet group compound module 421.Data packet group compound module 421 will come from the synthetic compressed header packet of information sets of data block processing module 411, and this compressed header packet and the data volume that comes from the packet of plate internal bus 441 are combined into compressed data packets.Compressed data packets after data packet group compound module 421 will make up sends to bus interface 431 by plate internal bus 441, and then send to mainboard 10 by system bus 30, send to interface board 42 by mainboard 10, concrete sending method can be transmitted or transparent transmission by equipment such as mainboards according to existing routing forwarding technology.
After interface board 42 receives the compressed data packets that comes from interface board 41 by bus interface 432, function call module 512 is called the professional transfer function that sets in advance by Hook Function, inquire the professional pairing not log-on data piece of not startup, and send it to data block processing module 412.Data block processing module 412 is according to starting essential data block and coming from the not log-on data piece of function call module 512 in the compressed header packet, create the redundant data piece, and this redundant data piece and log-on data piece are not sent to data packet group compound module 422 by plate internal bus 442 in the lump.Extract in the compressed header packet of bus 442 between data packet group compound module 422 slave plates and start essential data block, and with itself and redundant data piece and not the log-on data piece be combined into and recover packet header, and then the data volume that will recover in packet header and the compressed data packets is combined into recovery data packets, and with this recovery data packets transmission interface 52, thereby finish transmission to a packet.
Because in the present embodiment, function call module 511 not log-on data piece is deleted from essential data block, and it is not transmitted between plate, has therefore reduced the packet header size of actual transmissions, thereby has further improved actual effective bandwidth utilance.And not log-on data piece correspondence be not start business, therefore do not influence the result of transfer of data.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and scope of technical solution of the present invention.
Claims (15)
1, a kind of interplate communication method is characterized in that, comprising:
After the incoming interface plate received a packet, the redundant data block delete with in the packet header of this packet was combined into compressed header packet with the essential data block in the packet header, and the data volume in compressed header packet and the packet is combined into compressed data packets;
Compressed data packets is sent to the outgoing interface plate;
After the outgoing interface plate receives compressed data packets, create the redundant data piece, essential data block and redundant data piece are combined into recovery packet header, the data volume that recovers in packet header and the compressed data packets is combined into recovery data packets according to compressed header packet.
2, interplate communication method according to claim 1 is characterized in that, describedly creates the redundant data piece according to compressed header packet and comprises: create the redundant data piece according to the essential data block in the compressed header packet.
3, interplate communication method according to claim 1 is characterized in that, described step comprises: compressed data packets is sent to before the outgoing interface plate, also essential data block is carried out adjacent arrangement.
4, interplate communication method according to claim 3 is characterized in that, described step also comprises: compressed data packets is sent to before the outgoing interface plate, also write redundant data piece obligate information in compressed header packet.
5, interplate communication method according to claim 4 is characterized in that, describedly creates the redundant data piece according to compressed header packet and comprises: according to the redundant data piece obligate information in the compressed header packet, create the redundant data piece.
6, interplate communication method according to claim 1, it is characterized in that, described step also comprises: compressed data packets is sent to before the outgoing interface plate, also with the professional pairing not log-on data block delete of the not startup in the packet header, and will start essential data block and be combined into compressed header packet.
7, interplate communication method according to claim 6, it is characterized in that, described not log-on data block delete comprises: call the corresponding business transfer function by Hook Function, inquiry does not start professional pairing not log-on data piece, not the log-on data block delete.
8, interplate communication method according to claim 7 is characterized in that, described step also comprises: after the outgoing interface plate receives compressed data packets, also call the corresponding business transfer function by Hook Function, inquire not log-on data piece.
9, interplate communication method according to claim 8 is characterized in that, describedly creates the redundant data piece according to compressed header packet and comprises: create the redundant data piece according to the not log-on data piece that starts essential data block and inquire in the compressed header packet.
10, interplate communication method according to claim 9 is characterized in that, the described recovery packet header that is combined into comprises: the redundant data piece that starts essential data block, the not log-on data piece that inquires and establishment in the compressed header packet is combined into recovers packet header.
11, according to an any described interplate communication method among the claim 1-10, it is characterized in that, describedly also comprise: the packet of receiving is saved as backup data package before the redundant data block delete in the packet header of packet.
12, according to an any described interplate communication method among the claim 3-5, it is characterized in that, also comprise: be the disposable appointment relative address of the essential data block of adjacent arrangement, with the compressed data packets tracing in the internal memory of outgoing interface plate.
13, a kind of interface board is characterized in that, comprising:
The data block processing module is used for when sending or receive packet, deletion or establishment redundant data piece;
The data packet group compound module is used for when sending or receive packet, and the essential data block that will come from the data block processing module is combined into compressed header packet, and the data volume in this compressed header packet and the packet is combined into compressed data packets; Perhaps, the essential data block and the redundant data piece that will come from the data block processing module are combined into recovery packet header, and the data volume that will recover in packet header and the compressed data packets is combined into recovery data packets.
14, interface board according to claim 13 is characterized in that, also comprises:
The function call module is used for calling the corresponding business transfer function by Hook Function, inquire not start professional pairing not log-on data piece, and the log-on data piece is not deleted from the essential data block that comes from described data block processing module.
15, according to claim 13 or 14 described interface boards, it is characterized in that: described interface board is arranged in the router device, links to each other with system bus.
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| CNB2006101500946A CN100508500C (en) | 2006-10-26 | 2006-10-26 | Interplate communicating method and interface plate |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010031324A1 (en) * | 2008-09-18 | 2010-03-25 | 华为技术有限公司 | Method, device and system for data transmission |
| CN102546400A (en) * | 2011-12-20 | 2012-07-04 | 福建星网锐捷网络有限公司 | Communication method between cards, communication card and network forwarding device |
| CN102833146A (en) * | 2011-06-17 | 2012-12-19 | 华为技术有限公司 | Method and equipment for network duplicate removal |
| CN104269810A (en) * | 2014-10-13 | 2015-01-07 | 北京四方继保自动化股份有限公司 | Network redundant data restraining method for relay protection device |
| US9385886B2 (en) | 2011-07-06 | 2016-07-05 | Huawei Technologies Co., Ltd. | Method for processing a packet and related device |
| CN111083073A (en) * | 2019-12-31 | 2020-04-28 | 北京华环电子股份有限公司 | Interface extension method of Ethernet switch equipment |
| CN111770045A (en) * | 2019-08-14 | 2020-10-13 | 北京京东尚科信息技术有限公司 | Information processing method, device, equipment and computer readable storage medium |
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2006
- 2006-10-26 CN CNB2006101500946A patent/CN100508500C/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010031324A1 (en) * | 2008-09-18 | 2010-03-25 | 华为技术有限公司 | Method, device and system for data transmission |
| CN102833146A (en) * | 2011-06-17 | 2012-12-19 | 华为技术有限公司 | Method and equipment for network duplicate removal |
| CN102833146B (en) * | 2011-06-17 | 2015-07-22 | 华为技术有限公司 | Method and equipment for network duplicate removal |
| US9385886B2 (en) | 2011-07-06 | 2016-07-05 | Huawei Technologies Co., Ltd. | Method for processing a packet and related device |
| CN102546400A (en) * | 2011-12-20 | 2012-07-04 | 福建星网锐捷网络有限公司 | Communication method between cards, communication card and network forwarding device |
| CN104269810A (en) * | 2014-10-13 | 2015-01-07 | 北京四方继保自动化股份有限公司 | Network redundant data restraining method for relay protection device |
| CN104269810B (en) * | 2014-10-13 | 2017-06-20 | 北京四方继保自动化股份有限公司 | A kind of protective relaying device suppresses network redundancy data method |
| CN111770045A (en) * | 2019-08-14 | 2020-10-13 | 北京京东尚科信息技术有限公司 | Information processing method, device, equipment and computer readable storage medium |
| CN111083073A (en) * | 2019-12-31 | 2020-04-28 | 北京华环电子股份有限公司 | Interface extension method of Ethernet switch equipment |
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| Publication number | Publication date |
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| CN100508500C (en) | 2009-07-01 |
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