CN101217421B - A detection of protocol component based realization method, component group, hardware adapting method and device - Google Patents
A detection of protocol component based realization method, component group, hardware adapting method and device Download PDFInfo
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Abstract
The invention discloses a method for realizing a component based detecting protocol and a components group of the detecting protocol, and moreover a hardware adaptation method of the detecting protocol and a hardware adaptation device of the detecting protocol; wherein, the hardware adaptation method of the detecting protocol includes: testing whether the present hardware architecture comprises one or more CPU or CPU core when the detecting protocol initializes; if YES, using a processing component of the detecting protocol on a main CPU and a adaptation component with high speed on an auxiliary CPU and communicating the adaptation component with high speed with a port component of the detecting protocol on the main CPU; or else, using the processing component of the detecting protocol and a adaptation component with low speed on the present CPU and communicating the adaptation component with low speed with a port component of the detecting protocol. The invention has the advantages of helping detecting protocol realize the automatic adaptation with different hardware architecture and having good expansibility and compatibility.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of detection protocol componential realizing method, a kind of detection protocol component sets, a kind of detection protocol hardware adapting method and a kind of detection protocol hardware adaptive device.
Background technology
Detection protocol is used to find network defective; thereby the protection that triggers next step is switched; to improve the reliability of network; BFD (the BidirectionalForwarding Detection that proposes in succession as standardization bodies such as IETF, ITU, IEEE; two-way forwarding detection), MPLS OAM (Multi-Protocol LabelSwitch Operations and Management; multiprotocol label switching operation and management), EthernetOAM (Operations and Management, operation and management) etc.On principle, present detection protocol all is by periodically sending detection messages, and whether periodic test receives that detection messages (back message using) judges whether the path exists defective.
At present, above-mentioned detection protocol generally is with common procotol etc., is placed among the CPU and realizes.Specifically, for centralized device, above-mentioned consultation is placed in the host CPU to be realized; For distributed apparatus, above-mentioned agreement will be looked concrete condition, and the CPU that is placed on master control borad or cable card board goes up and realizes.But, detection protocol and other procotol are realized in same CPU, be easy to because the influence of other agreement makes equipment delay to send detection messages, thereby causing detecting performance is difficult to guarantee that this problem is especially obvious when the sense cycle of 10ms level detects even with submicrosecond in detection protocol.We can carry out the division of high speed detection and low-speed detection according to the numerical value of sense cycle with to detecting Effect on Performance as differentiation; For instance, when with 50ms being boundary when dividing, we are sense cycle that 50ms and following detection thereof call high speed detection, and sense cycle is that the above detection of 50ms is called low-speed detection; Again for example, with 100ms boundary when dividing, we are sense cycle that 100ms and following detection thereof call high speed detection, sense cycle is that the above detection of 100ms is called low-speed detection.It may be noted that, the cut off value of dividing high speed/low-speed detection is to be provided with according to different products or application, above-mentioned 50ms, 100ms mainly are applicable to high-end devices, and for low side devices, can with second as cut off value, sense cycle is that 1s and following detection thereof become high speed detection, and sense cycle is the low-speed detection that is called more than the 1s.In any case though depend on the ability and the objective detection demand of place equipment, the cut off value of detection protocol is also uncertain; But and other procotol is when realizing in same CPU, and detection protocol certainly exists a cut off value, when it adopts when being the high speed detection of benchmark with this cut off value, will cause detecting performance decrease.
Along with the cost of CPU constantly reduces, and the appearance of double-core even multi-core CPU, can increase auxiliary CPU by extra in system, perhaps adopt a nuclear of multi-core CPU, independently realize above-mentioned measuring ability, the performance of assurance high speed detection.For this independent CPU that realizes measuring ability, can be referred to as aiding CPU.
But, because product has different forms in actual the use, such as whether there being aiding CPU, the otherness of hardware structure when perhaps having aiding CPU (as centralized/distributed), therefore often need form, realize the setting of detection protocol by the mode of static state compiling according to product reality.This also just means, when detection protocol operates in the different products, has to carry out corresponding modification and debugging, autgmentability and compatible relatively poor.
Summary of the invention
A purpose of the embodiment of the invention is to provide a kind of componentization implementation of detection protocol, and agreement realization function and transmission-receiving function with the separation detection agreement make it support high speed detection and low-speed detection respectively.
Another purpose of the embodiment of the invention is to provide the hardware adaptation scheme of detection protocol, can realize detection protocol adaptive automatically under the different hardware framework.
For realizing above-mentioned first purpose, embodiments of the invention provide the detection protocol componential realizing method, may further comprise the steps:
Agreement is split as processing member, interface component, the adaptive member of high speed with packet sending and receiving ability and the adaptive member of low speed;
When the adaptive member of high speed enabled, this processing member called the adaptive member of described high speed by described interface component, realized detecting according to the high speed detection cycle that is provided with;
When the adaptive member of low speed enabled, this processing member called the adaptive member of described low speed by described interface component, realized detecting according to the low-speed detection cycle that is provided with.
In order to realize above-mentioned first purpose, embodiments of the invention also provide a kind of detection protocol component sets, comprising:
Adaptive member of high speed and the adaptive member of low speed with packet sending and receiving ability;
Interface component, be connected with the adaptive member of low speed with the adaptive member of this high speed respectively by this interface component, be used under the situation that the adaptive member of high speed enables, call the adaptive member of high speed, realize detecting under the situation that the adaptive member of low speed enables according to the high speed detection cycle that is provided with, call the adaptive member of low speed, realize detecting according to the low-speed detection cycle that is provided with.
In order to realize above-mentioned second purpose, embodiments of the invention provide a kind of detection protocol hardware adapting method, may further comprise the steps:
S1, when the detection protocol initialization, detect current hardware structure and whether have two above CPU or CPU nuclear;
S2, be then, the processing member of enable detection agreement on host CPU, the adaptive member of the high speed of enable detection agreement on aiding CPU, and the adaptive member of this high speed is associated to the interface component of this detection protocol on the host CPU;
S3 otherwise, the processing member of enable detection agreement and the adaptive member of low speed on current C PU, and the adaptive member of this low speed is associated to the interface component that current C PU goes up this detection protocol.
In order to realize above-mentioned second purpose, embodiments of the invention also provide a kind of detection protocol hardware adaptive device, comprising:
The hardware structure detecting unit is used for when the detection protocol initialization, detects current hardware structure and whether has two above CPU or CPU nuclear;
The high speed adaptation unit, be used to accept the triggering of this hardware structure detecting unit under situation with two above CPU or CPU nuclear, the processing member of enable detection agreement on host CPU, the adaptive member of the high speed of enable detection agreement on aiding CPU, and the adaptive member of this high speed is associated to the interface component of this detection protocol on the host CPU;
The low speed adaptation unit, be used to accept this triggering of hardware structure detecting unit under the situation that only has a monokaryon CPU, the processing member of enable detection agreement and the adaptive member of low speed on current C PU, and the adaptive member of this low speed is associated to the interface component that current C PU goes up detection protocol.
As shown from the above technical solution, embodiments of the invention are by the componentization detection protocol, and the mode that adopts the detection protocol processing capacity to separate with transmission-receiving function has following beneficial effect:
1, realizes detection protocol adaptive automatically under the different hardware framework, have favorable expansibility and compatibility;
2, under the aiding CPU framework, support protocol detection function at a high speed.
With reference to the accompanying drawing description of a preferred embodiment, above-mentioned and other purpose of the present invention, feature and advantage will be more obvious by following.
Description of drawings
Fig. 1 is the functional schematic of detection protocol;
Fig. 2 is the block diagram of detection protocol component sets one embodiment provided by the invention;
Fig. 3 is the block diagram of another embodiment of detection protocol component sets provided by the invention;
Fig. 4 is the flow chart of detection protocol hardware adapting method one embodiment provided by the invention;
Fig. 5 is the flow chart of another embodiment of detection protocol hardware adapting method provided by the invention;
Fig. 6 A be Fig. 4 or embodiment illustrated in fig. 5 in, the schematic diagram that message sends on the aiding CPU;
Fig. 6 B Fig. 4 or embodiment illustrated in fig. 5 in, the schematic diagram that message receives on the aiding CPU;
Fig. 6 C be Fig. 4 or embodiment illustrated in fig. 5 in, another schematic diagram that message sends on the aiding CPU;
The block diagram of Fig. 7 detection protocol hardware provided by the invention adaptive device one embodiment;
Fig. 8 be detection protocol hardware adaptive device provided by the invention adaptive after, the block diagram of member embodiment in host CPU and the aiding CPU.
Embodiment
To describe specific embodiments of the invention in detail below.Should be noted that the embodiments described herein only is used to illustrate, be not limited to the present invention.
At first, mandatory declaration be, general plotting of the present invention is that the detection protocol by a kind of componentization shields the difference of hardware structure, thereby on equipment, can realize detection at a high speed with centralized/distributed aiding CPU hardware, on the equipment that does not possess aiding CPU hardware, can realize the detection of low speed.
In order to realize this purpose, at first need to learn about the major function of agreement, as shown in Figure 1, be the functional schematic of detection protocol.
Wherein, finish the required processing of carrying out of detection protocol function and comprise: state machine and corresponding state computing have constituted the core processing part of agreement, have very strong extraneous dependence, need carry out state transformation according to the instruction in the external world; Accordingly, it is then irrelevant with the variation in the external world that processing is received/sent out to message, but it has very high time requirement.
In order to make detection protocol can adapt to various hardware structures with the modification of minimum, embodiments of the invention provide a kind of detection protocol componentization method, may further comprise the steps:
Agreement is split as the adaptive member of low speed of handling member, interface component, having the adaptive member of high speed of packet sending and receiving ability and have the packet sending and receiving ability; Adaptive member of this high speed and the adaptive member of this low speed can be handled component composition with this respectively by this interface component, realize complete detection protocol function.
When the adaptive member of high speed enabled, this processing member called the adaptive member of high speed by interface component, realized detecting according to the high speed detection cycle that is provided with, and promptly handled the adaptive component composition of member, interface component and high speed and was operated under the fast mode; It is pointed out that the concrete sense cycle of using the adaptive member of this high speed need be provided with according to actual conditions, such as the 50ms of high-end devices, below the 100ms, the 1s of low side devices is with inferior.
When the adaptive member of low speed enabled, this processing member called the adaptive member of low speed by interface component, realized detecting according to the low-speed detection cycle that is provided with, and promptly handled the adaptive component composition of member, interface component and low speed and was operated under the low-speed mode; It may be noted that equally the concrete sense cycle of using the adaptive member of this low speed also needs to be provided with according to actual conditions, such as the 50ms of high-end devices, more than the 100ms, the 1s of low side devices is with first-class.
By above step, just can detection protocol is independent to the high part of time requirement, realize the componentization separating treatment of detection protocol function.
Because in the protocol detection process, the easiest function that is subjected to the hardware influence is that message sends, this just makes the adaptive member of high speed have multiple method for splitting.
For example, the adaptive member of high speed only can be split as message and send sub-member, other function as periodically control, message reception etc., also is placed on to handle in the member and finishes; Thereby satisfy the most basic, the requirement that sends at a high speed for detection messages; In this case, handle member according to the high speed detection cycle that is provided with, periodically calling the adaptive member of high speed by interface component sends the relevant detection protocol massages, and receives and handle back message using voluntarily.
Again for example, the adaptive member of high speed is split as message sends sub-member and message receives sub-member, thereby further satisfies the requirement that detection messages receives stability; In this case, handle member according to the high speed detection cycle that is provided with, periodically calling the adaptive member of high speed by interface component sends the relevant detection protocol massages; And receive and handle the back message using that the adaptive member of described high speed receives by interface component.
On the basis of above-mentioned two kinds of situations, the adaptive member of high speed can also be split out the sub-member of task; Wherein, the sub-member of this task is used for periodically instructing message to send the transmission that sub-member carries out detection messages according to handling the high speed detection cycle that member issues, and further reduces the workload of handling member.That is to say, handle member and can call the adaptive member of high speed, make it, periodically send the relevant detection protocol massages according to the high speed detection cycle that is provided with by interface component.
One of ordinary skill in the art will appreciate that the adaptive member of low speed can carry out the similar fractionation of sub-member equally, does not repeat them here.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, described program can be stored in the computer read/write memory medium, this program comprises the steps: when carrying out
Agreement is split as processing member, interface component, the adaptive member of high speed with packet sending and receiving ability and the adaptive member of low speed;
When the adaptive member of high speed enabled, described processing member called the adaptive member of described high speed by described interface component, realized detecting according to the high speed detection cycle that is provided with;
When the adaptive member of low speed enabled, described processing member called the adaptive member of described low speed by described interface component, realized detecting according to the low-speed detection cycle that is provided with.
Described storage medium comprises: ROM/RAM (Read Only Memory/Random-AccessMemory, read-only memory/random-access memory), magnetic disc or CD etc.
Accordingly, embodiments of the invention provide detection protocol component sets 10, as shown in Figure 2, comprising:
Handle member 11;
The adaptive member 14 of low speed;
Wherein, handle member 11 and be connected with the adaptive member 14 of low speed with the adaptive member 13 of high speed respectively, be used under the situation that the adaptive member 13 of high speed enables, calling the adaptive member 13 of high speed, realize detecting according to the high speed detection cycle that is provided with by interface component 12; Under the situation that the adaptive member 14 of low speed enables, call the adaptive member 14 of low speed, realize detecting according to the low-speed detection cycle that is provided with.
By above-mentioned component sets 10, when the adaptive member 14 of adaptive member 13/ low speed of high speed was registered on the interface component 12, processing module 11 can be understood current detecting pattern, thereby carried out high speed/low-speed detection.
It may be noted that the adaptive member 13 of high speed comprises at least:
Message sends sub-member 13A, is used for according to the processing member 11 of detection protocol sending the relevant detection protocol massages periodically by the calling of interface component 12; Thereby satisfy the most basic, the requirement that sends at a high speed for detection messages.
Preferable, the adaptive member 13 of high speed also comprises: message receives sub-member 13B, is used to discern the detection protocol message that receives, and corresponding the triggering by interface component 12 handled members 11 and handled.
Better, in order further to reduce the workload of handling member, the adaptive member 13 of high speed also comprises the sub-member 13C of task, being arranged on interface component 12 and message sends between the sub-member 13A, be used for according to handling the high speed detection cycle that member 11 issues, the periodic triggers message sends sub-member 13A and sends the relevant detection protocol massages.
As shown in Figure 3, the block diagram that has shown 10 1 preferred embodiments of detection protocol component sets.
On the basis that the detection protocol componentization is divided, the embodiment of the invention provides the detection protocol hardware adapting method, as shown in Figure 4, may further comprise the steps:
S1, when the detection protocol initialization, detect current hardware structure and whether have two above CPU or CPU nuclear; Be execution in step S2 then, otherwise execution in step S3;
Generally speaking, the detection protocol initialization all occurs in the system starting process, can know current hardware structure by means such as existing systems self checks, does not repeat them here.
But, when having a plurality of CPU or a plurality of CPU nuclear, might the user also not necessarily wish to enable high speed detection.Therefore, have only when hardware capabilities and user configuration is all supported aiding CPU, just can enable the high speed detection ability.That is to say, detect current hardware structure among the step S 1 and have after plural CPU or the CPU nuclear, comprise also whether detection enables the step of high speed detection, is execution in step S2 then, otherwise execution in step S3.
S2, on host CPU the processing member of enable detection agreement, the adaptive member of the high speed enable detection agreement, that have high-speed message transmitting-receiving adaptation ability on aiding CPU, and the adaptive member of this high speed is associated to the interface component of detection protocol on the host CPU;
By this step S2, can be under the aiding CPU framework, finish in the detection protocol the high part of time requirement being placed on the aiding CPU, the part that dependence is strong to external world is placed on the host CPU finishes.
Further, in this step S2,, can specify host CPU at random identifying under the situation with many CPU or CPU nuclear.But because in the actual different product form, there is certain difference in the planning of aiding CPU, for instance, aiding CPU can be positioned on the master control borad of distributed apparatus, also can be positioned on the cable card board of distributed apparatus, certainly, aiding CPU also might be positioned on the centralized device.Therefore, often identify under the situation with many CPU or CPU nuclear, also need actual conditions, select a suitable host CPU according to agreement at this step S2, common, be to select the CPU of master control borad as host CPU.
The CPU that it may be noted that the option interface plate is also no problem as host CPU, just realizes going up slightly more complicated, the situation that host CPU shifts when needing the consideration interface board to extract.
S3, on current C PU the enable detection agreement the processing member and have the adaptive member of low speed of low speed packet sending and receiving adaptation ability and sense cycle be set, and the adaptive member of this low speed is associated to the interface component that current C PU goes up this detection protocol.
By above-mentioned steps S1～S3 as can be seen, by judging the existence of aiding CPU, can independently register different implementations in the interface component:, just register the interface of low speed adaption section for the system that does not support aiding CPU; For the system that supports aiding CPU, just register the interface of high speed adaption section.Like this, because the support of interface component for different detection modes arranged, when detection protocol is applied to different hardware structure (concentration/distribution formula, be/do not support aiding CPU etc.), agreement realizes that partly promptly handling member can not revise substantially, thereby realize detection protocol adaptive automatically under the different hardware framework, one cover detection protocol can be run on the hardware product of the different frameworks of many moneys, have favorable expansibility and compatibility.
Obviously, when the adaptive new hardware structure of needs, only needing increases corresponding association code, does not need to revise the code of handling member.
Simultaneously, this step S1～S3 provides using independent CPUs to realize the support of high speed detection function.
It is pointed out that above-mentioned steps S1～S3 is the hardware adaptive mechanism operation of detection protocol initial phase, makes detection protocol and current hardware configuration adaptive.But, realize detecting if want, also need the user after the detection protocol initialization procedure, need and detect according to hardware environment and require to be provided with the relevant detection cycle: owing to no longer compete with other procotol, therefore when on aiding CPU, having enabled the adaptive member of high speed, can this sense cycle of relative set be high speed detection; And when having enabled the adaptive member of low speed,, detection protocol is operated under the low-speed mode in order to guarantee to detect performance, promptly dispose the low-speed detection cycle.
Referring to Fig. 5, be the flow chart of another embodiment of hardware adapting method of detection protocol provided by the invention.
In Fig. 4 or step S2 shown in Figure 5, concrete, based on the difference fractionation mode of the adaptive member of high speed, the step that the adaptive member of high speed is associated to the interface component of detection protocol on the host CPU can comprise:
The interface that message is sent sub-member is registered on the interface component of detection protocol on the host CPU, and the processing member period that makes detection protocol is called message and sent the I/O interface transmission relevant detection protocol massages of sub-member by aiding CPU through registration interface; As shown in Figure 6A, thus satisfy the most basic, the requirement that sends at a high speed for detection messages.
It should be noted that in three agreements shown in Fig. 6 A,, determine because the host CPU of each agreement is the actual conditions of looking each agreement though it handles member and interface component all enables on host CPU, and does not mean that on same CPU.
Perhaps, the step that among the step S2 the adaptive member of high speed is associated to the interface component of detection protocol on the host CPU can comprise:
The interface that message is sent sub-member is registered on the interface component of detection protocol on the host CPU, and the processing member period that makes detection protocol is called message and sent the I/O interface transmission relevant detection protocol massages of sub-member by aiding CPU through registration interface; And, the interface that message is received sub-member is registered on the interface component of detection protocol on the host CPU, make the I/O interface of aiding CPU call the message that has enabled successively and receive sub-member, the detection protocol message that identification receives, and correspondingly trigger described processing member by registration interface and handle.Wherein, message receives the processing of sub-member on aiding CPU shown in Fig. 6 B.
Particularly, aspect the message reception,,, realize by the mode of relatively simply linking up with (Hook) so on aiding CPU, can realize complete agreement grader because the protocol type that carries on the aiding CPU is less relatively.General scheme is as follows: each agreement receives sub-member is registered to aiding CPU in the mode of hook I/O interface with its message after starting high speed detection.The function that the I/O interface of this aiding CPU is realized comprises the identification to protocol massages, and then, the message that calls registration successively receives sub-member message is handled.
Further, competition on the aiding CPU between a plurality of agreements, on the basis of situation shown in Fig. 6 A, the 6B, the registration that message can be sent sub-member replaces with the registration of the sub-member of task: the interface of the sub-member of task is registered on the interface component of the above detection protocol of host CPU, make it according to the calling of the processing member of detection protocol, the periodic triggers message sends the I/O interface of sub-member by aiding CPU and sends the relevant detection protocol massages.Be responsible for periodic message transmission work by the sub-member of independent task, can guarantee that not only the high speed of message sends, make the framework of the adaptive member of high speed more clear simultaneously, and be easy to expansion.
Further, on the basis of the sub-member of task, the priority that only message need be sent task in the system is heightened, and the sub-member of the task that is notified to, and just can guarantee the real-time that detection messages sends, thereby avoids the priority competition between a plurality of agreements.It specifically can be implemented by following steps: the sub-member of task obtains described processing member issues, detection protocol priority of messages by interface component, and with aiding CPU on the sub-member of task of other agreement carry out prioritization.
Shown in Fig. 6 C, shown the processing schematic diagram of the sub-member of task on aiding CPU.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, described program can be stored in the computer read/write memory medium, this program comprises the steps: when carrying out
S1, when the detection protocol initialization, detect current hardware structure and whether have two above CPU or CPU nuclear;
S2, be then, the processing member of enable detection agreement on host CPU, the adaptive member of the high speed of enable detection agreement on aiding CPU, and the adaptive member of described high speed is associated to the interface component of the above detection protocol of host CPU;
S3 otherwise, the processing member of enable detection agreement and the adaptive member of low speed on current C PU, and the adaptive member of described low speed is associated to the interface component of the above detection protocol of current C PU.
Described storage medium comprises: ROM/RAM (Read Only Memory/Random-AccessMemory, read-only memory/random-access memory), magnetic disc or CD etc.
Based on above-mentioned detection protocol component sets, embodiments of the invention also provide detection protocol hardware adaptive device 20, as shown in Figure 7, comprising:
Hardware structure detecting unit 21 is used for when the detection protocol initialization, detects current hardware structure and whether has two above CPU or CPU nuclear;
High speed adaptation unit 22, be used to accept the triggering of hardware structure detecting unit 21 under situation with two above CPU or CPU nuclear, the processing member of enable detection agreement on host CPU, the adaptive member of the high speed of enable detection agreement on aiding CPU, and the adaptive member of high speed is associated to the interface component of detection protocol on the host CPU;
Low speed adaptation unit 23, be used to accept the triggering of hardware structure detecting unit 21 under the situation that only has a monokaryon CPU, the processing member of enable detection agreement and the adaptive member of low speed on current C PU, and the adaptive member of low speed is associated to the interface component of the above detection protocol of current C PU.
Preferable, also comprise adaptive detecting unit 24, be used to accept the triggering of hardware structure detecting unit 21 under situation, detect current hardware structure and whether enabled high speed detection with two above CPU or CPU nuclear, be then to trigger high speed adaptation unit 22, otherwise trigger low speed adaptation unit 23.
Better, high speed adaptation unit 22 comprises host CPU selection module 221, is used for determining host CPU according to the triggering to place high speed adaptation unit 22.
Hardware adaptive device 20 by above-mentioned detection protocol as can be seen, in service in detection protocol, can register real interface according to hardware structure, thereby realize the dynamic match technology, reach shielding to hardware structure, when making detection protocol operate on the different hardware, need to revise, adaptive part significantly reduces.Simultaneously, this hardware adaptive device 20 also provides using independent CPUs to realize the support of high speed detection function.
In conjunction with detection protocol component sets 10, through the hardware adaptive device 20 of detection protocol adaptive after, exist under the situation of aiding CPU, member embodiment as shown in Figure 8 in host CPU and the aiding CPU.
Though described the present invention with reference to several exemplary embodiments, should be appreciated that used term is explanation and exemplary and nonrestrictive term.The spirit or the essence that do not break away from invention because the present invention can specifically implement in a variety of forms, so be to be understood that, the foregoing description is not limited to any aforesaid details, and should be in the spirit and scope that claim limited of enclosing explain widely, therefore fall into whole variations in claim or its equivalent scope and remodeling and all should be the claim of enclosing and contain.
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| CN1556641A (en) * | 2004-01-01 | 2004-12-22 | 浙江大学 | Component-based Realization Method of Communication Protocol |
| CN101079759A (en) * | 2007-07-24 | 2007-11-28 | 杭州华三通信技术有限公司 | Distributed bidirectional forwarding detection method and device |
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| CN1556641A (en) * | 2004-01-01 | 2004-12-22 | 浙江大学 | Component-based Realization Method of Communication Protocol |
| CN101079759A (en) * | 2007-07-24 | 2007-11-28 | 杭州华三通信技术有限公司 | Distributed bidirectional forwarding detection method and device |
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