CN103051542B - The method of detection of connectivity is realized based on data link layer ethernet mac address - Google Patents
The method of detection of connectivity is realized based on data link layer ethernet mac address Download PDFInfo
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- CN103051542B CN103051542B CN201210530707.4A CN201210530707A CN103051542B CN 103051542 B CN103051542 B CN 103051542B CN 201210530707 A CN201210530707 A CN 201210530707A CN 103051542 B CN103051542 B CN 103051542B
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Abstract
The invention discloses a kind of method realizing detection of connectivity based on data link layer ethernet mac address, comprising: detection of connectivity operation originating end structure detection of connectivity request message, and target MAC (Media Access Control) address, VLAN and precedence field are set; Described detection of connectivity request message is encapsulated in the public heading of loading multi-protocols; Generate detection of connectivity ethernet data frame; Search mac address forwarding table according to target MAC (Media Access Control) address and determine port, if find outbound port, only send detection of connectivity ethernet frame to the port found; After receiving terminal receives message, in interchange of data message, source MAC and target MAC (Media Access Control) address content generate detection of connectivity and reply message, then send detection of connectivity reply message; Originating end at the appointed time in receive detection of connectivity and reply message and then export the testing result of connection.The present invention takies less without the need to configuration, cpu resource, is easy to realize and expansion.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of method realizing detection of connectivity based on data link layer ethernet mac address.
Background technology
Failure of connectivity is modal a kind of fault in network failure.As everyone knows, ping and track command are the orders that the common network connectivty of a class detects, but whether such order can only be tested opposite end by Ipv4 address or Ipv6 address and can reach, and cannot realize detection of connectivity on data link level.Also have the agreement of many detection of connectivity on data link level, the agreements such as such as CFM, Y1731, but these protocol configuration are comparatively complicated, and require that equipment has higher CPU disposal ability or hardware support capabilities, some low side devices cannot be supported.How based on data link layer ethernet mac address by detection of connectivity without the need to configuration, simple, be effectively applied to data link layer and become one and have problem to be solved.
Summary of the invention
The technical problem to be solved in the present invention is a kind of method realizing detection of connectivity based on data link layer ethernet mac address taking less without the need to configuration, cpu resource, be easy to realization and expand.
In order to solve the problems of the technologies described above, the invention provides a kind of method realizing detection of connectivity based on data link layer ethernet mac address, comprising:
A, detection of connectivity operation originating end structure detection of connectivity request message, and target MAC (Media Access Control) address, VLAN and precedence field are set;
B, described detection of connectivity request message is encapsulated in the public heading of loading multi-protocols;
C, target MAC (Media Access Control) address, VLAN and precedence field according to set generate detection of connectivity ethernet data frame;
D, search mac address forwarding table according to target MAC (Media Access Control) address and determine port, if find outbound port, only send detection of connectivity ethernet frame to the port found;
The receiving terminal that E, target MAC (Media Access Control) address are specified records packet receiving physical port, VLAN and source MAC address information after receiving connectivity testing message, generate detection of connectivity by source MAC in interchange of data message and target MAC (Media Access Control) address content and reply message, then the physical port preserved during by receiving message sends detection of connectivity reply message;
F, detection of connectivity operation originating end wait-receiving mode end is responded detection of connectivity and is replied message, if receive detection of connectivity at the appointed time to reply message, exports the testing result of connection, otherwise exports inaccessible testing result.
Further, in described step D, if search less than outbound port, then send detection of connectivity ethernet frame to all physical ports.
Further, the content of described detection of connectivity request message comprises initiation time, transmitting terminal process identification (PID) and sequence number.
Further, described public heading comprises version number, protocol type, jumping figure, payload length, source MAC and target MAC (Media Access Control) address.
Further, the type of described detection of connectivity request message is request message type, and the encapsulation format of message is: type+code+inspection and+identifier+sequence number+option data, has has wherein filled in and issued the time in option data.
Further, in described step B, the encapsulation format of described public heading is: version number+COS+payload length+reserved place+jumping figure+protocol type+source MAC+source vid+ target MAC (Media Access Control) address+object vid, the data message type that agreement is carrying detection of connectivity is set, payload length is the length of detection of connectivity request msg message, source MAC and destination MAC Address are respectively detection of connectivity and operate originating end and receiving terminal MAC Address, and source vid and object vid is default value zero.
Further, in described step F, calculate two-way time after described detection of connectivity operation originating end receives detection of connectivity reply message and export.
The method realizing detection of connectivity based on data link layer ethernet mac address of the present invention, detection of connectivity request message is encapsulated in the public heading of loading multi-protocols, with the encapsulation format of independent data message, transmitting-receiving message handling process, is effectively applied to data link layer based on data link layer ethernet mac address by detection of connectivity.And this detection of connectivity can the various interfaces of compatible sock socket, use unified interface standard, take less without the need to configuration, cpu resource, be easy to realize and expansion.
Accompanying drawing explanation
Fig. 1 flow chart realizing detection of connectivity based on data link layer ethernet mac address of the present invention.
Fig. 2 is the message data message encapsulation format of detection of connectivity request and response in the present invention.
Fig. 3 is the public heading of loading multi-protocols in the present invention.
Fig. 4 is ethernet data frame encapsulation format in the present invention.
Fig. 5 is the data message process chart realizing detection of connectivity in the present invention based on data link layer ethernet mac address.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described, can better understand the present invention and can be implemented, but illustrated embodiment is not as a limitation of the invention to make those skilled in the art.
As shown in Figure 1, the method realizing detection of connectivity based on data link layer ethernet mac address of the present invention, comprising:
Step 101, detection of connectivity operation originating end structure detection of connectivity request message, content comprises the initiation time, transmitting terminal process identification (PID), sequence number etc., and to fields such as this Process configuration target MAC (Media Access Control) address, VLAN, priority, and to arrange its data message type be request msg type of message;
Step 102, detection of connectivity request encapsulating is installed to can in the public heading of loading multi-protocols, public heading comprises the fields such as version number, protocol type, jumping figure, payload length, source MAC, object MAC location, and to arrange type be detection of connectivity data message;
Step 103, according to detection of connectivity operation originating end arrange the determine section such as target MAC (Media Access Control) address, VLAN, priority generation with detection of connectivity too net data frame;
Step 104, search mac address forwarding table according to target MAC (Media Access Control) address and determine port, if find outbound port, only send detection of connectivity ethernet frame to designated port, otherwise send detection of connectivity ethernet frame to all physical ports;
The receiving terminal that step 105, target MAC (Media Access Control) address are specified records the information such as packet receiving physical port, VLAN, source MAC after receiving connectivity testing message, generate detection of connectivity by source MAC in interchange of data message and target MAC (Media Access Control) address field contents and reply message, then the physical port preserved during by receiving message sends detection of connectivity reply message;
Step 106, detection of connectivity operation originating end waits for that the other side responds detection of connectivity and replys message, replys message, think and to be communicated with the other side, otherwise think that the other side is unreachable if receive at the appointed time.
On the basis of technique scheme, in step 101, detection of connectivity operation originating end structure detection of connectivity request message, the encapsulation format of this message is: type+code+inspection and+identifier+sequence number+option data, concrete form is see Fig. 2.In the present invention, type option has following several: request message; Response message; Destination address is unreachable; Time-out; Invalid message; Code options is zero; Inspection and be the inspection that generates of bearing bed bag stem+detection of connectivity request msg message with; Identifier is the identifier that local terminal is arranged; Sequence number is the sequence number sending message; Option data fills current time value.Setting data type of message is request msg type of message in this step, then according to the form padding data successively of data message, and the data message of structure detection of connectivity request.
On the basis of technique scheme, in step 102, detection of connectivity request message is encapsulated into can in the public heading of loading multi-protocols.Bearing bed can carry the data message of various protocols, has reliability connection data message, data message etc. without reliable connection data message, detection of connectivity.The encapsulation format of this public heading is version number+COS+payload length+reserved place+jumping figure+protocol type+source MAC+source vid+ target MAC (Media Access Control) address+object vid.Concrete form is see Fig. 3.Only need carry the data message of detection of connectivity in the present invention, protocol type is the data message type of carrying detection of connectivity, and version number is 01, and payload length is the length of detection of connectivity request msg message.Initial value arranges (being generally 32 or 64) by source host, and source MAC and destination MAC Address are local terminal and opposite end MAC Address, and source vid and object vid is default value zero at present.According to the form padding data successively of data message, structure bearing bed data message stem.
On the basis of technique scheme, in step 103, ethernet data frame is generated according to the section of determining such as target MAC (Media Access Control) address, VLAN, priority that detection of connectivity operation originating end is arranged, to build the encapsulation of data message (the public heading+detection of connectivity request msg message of loading multi-protocols) ethernet frame format, concrete form is see Fig. 4.Fill the related data of local terminal MAC Address, the MAC Address of destination and the protocol type of detection of connectivity data message successively according to too net data frame form, now, Ethernet data message Successful construct completes.
With reference to Fig. 5, the concrete steps of resolution data message are:
107, judge whether Ethernet encapsulated type is detection of connectivity Datagram Protocol type;
108, judge whether bearing bed encapsulated type is detection of connectivity data message type;
109, detection of connectivity data message subtype is judged;
110, receive detection of connectivity request msg message, then construct detection of connectivity and reply message, and send to opposite end;
111, receive detection of connectivity and reply message, judge whether it is the data message responding the request of local terminal detection of connectivity, if not, then abandon this data message;
If 112 these data messages are the data messages responding the request of local terminal detection of connectivity, then resolve this data message, and calculate two-way time.
On the basis of technique scheme, in step 107, according to the Ethernet encapsulation format shown in Fig. 4, the encapsulation of the Ethernet of the data message received is resolved, judge that whether type that Ethernet encapsulates is the protocol type of detection of connectivity data message.If the type of Ethernet encapsulation is not the protocol type of detection of connectivity data message in this data message, then abandon this data message.
On the basis of technique scheme, in step 108, resolve according to the bearing bed of bearing bed header encapsulation form to data message shown in Fig. 3, judge whether bearing bed encapsulated type is detection of connectivity data message type.If this data message bearing bed encapsulated type is not detection of connectivity data message type, then abandon this data message.If this data message bearing bed encapsulated type is detection of connectivity data message type, then record the MAC Address of source MAC Address and destination in bearing bed encapsulation.
On the basis of technique scheme, in step 109, according to the encapsulation format of the detection of connectivity data message shown in Fig. 2, detection of connectivity data message is resolved, judge the subtype of detection of connectivity data message.
On the basis of technique scheme, in step 110, if the subtype of detection of connectivity data message is detection of connectivity request message, then constructs detection of connectivity and reply message.Concrete steps are: the subtype of detection of connectivity data message is set to reply data message type by (1), and code options is zero, and identifier, sequence number, option data are identifier, sequence number, option data in the data message received.And recalculate inspection and.(2) the source MAC Address of record in step 108 is filled in the target MAC (Media Access Control) address of bearing bed header encapsulation form, the destination MAC Address of record is filled in the local terminal MAC Address of bearing bed header encapsulation form.Remainder data, according to the bearing bed data message header encapsulation form padding data successively shown in Fig. 3, constructs bearing bed data message stem.(3) the source MAC Address of record in step 108 is filled in the target MAC (Media Access Control) address of Ethernet encapsulation format, the destination MAC Address of record is filled in the local terminal MAC Address of Ethernet encapsulation format.Remainder data, according to the Ethernet encapsulation format padding data successively shown in Fig. 4, constructs Ethernet encapsulated header.(4) packaged data are sent detection of connectivity by Ethernet interface to originating end and reply message.
On the basis of technique scheme, in step 111, if the subtype of detection of connectivity data message is detection of connectivity reply message, then judge whether it is the message responding local terminal request.If the identifier carried in this detection of connectivity reply message is the same with sequence number with the identifier carried in the request msg message that sequence number and local terminal send out, then this detection of connectivity replys message is the message responding local terminal request.If this detection of connectivity replys in message the identifier that carries in the request msg message that the identifier that carries and sequence number and local terminal send out and sequence number is different, then this detection of connectivity reply message is not the message of response local terminal request, discardable.
On the basis of technique scheme, in step 112, it is the message responding local terminal request that detection of connectivity replys message, then the time value that the option data of replying message encapsulation according to detection of connectivity is carried calculates two-way time.When detection of connectivity reply message returns, deducting the time value left in detection of connectivity reply message by current time, is namely two-way time.
The method of detection of connectivity of the present invention, by the encapsulation format of above-described data message, transmitting-receiving message handling process, detection of connectivity is effectively applied to data link layer by ethernet mac address.And this detection of connectivity does not take cpu resource, do not need special hardware supports, provide various interface in conventional sock socket mode without the need to configuration, be easy to realize and expansion.
Realize the specific implementation of detection of connectivity based on data link layer ethernet mac address, its concrete steps are:
In receiving terminal correlation step be: (1) creates a sock socket, and to arrange Socket type and address bunch be data link.Create the creation method of the reusable original sock socket of socket, only need increase a Socket type data link, the Socket type that will create and address bunch are all set to data link.(2) port numbers of a receiving terminal is set, makes originating end successfully can connect receiving terminal.(3) bind receiving terminal socket, and monitor this socket.(4) connection of client is waited for, Accept and receive message.(5) message sink is complete, closes socket.
In the correlation step of originating end be: (1) creates a sock socket, and to arrange Socket type and address bunch be data link.(2) port numbers identical with receiving terminal is set.(3) receiving terminal Connect is connected.(4) give out a contract for a project to receiving terminal.(5) message is sent, and closes socket.
Its internal processing program can call different transmitting-receiving bag process functions according to the Socket type created from the obstructed of address style of binding.Detailed process is:
At originating end: (1) creates a sock socket at detection of connectivity operation originating end, and to arrange Socket type and address bunch be data link.(2) construct the data message of request of detection of connectivity, and to arrange its data message type be detection of connectivity request message.According to the message data message encapsulation format padding data successively of the detection of connectivity request shown in Fig. 2 and reply, the data message of structure detection of connectivity request.(3) construct bearing bed data message stem, fill local terminal MAC Address and destination MAC Address and other data successively according to the form of data message shown in Fig. 3, construct bearing bed data message stem.(4) ethernet format encapsulates this data message, and sends datagram.When not arranging unrestricted transmission detection of connectivity request message, originating end sent a detection of connectivity request message every one second, sent 5 continuously.Avoid due to network problem, cause data message lose and produce erroneous judgement.(5) start timer, wait for the data message that the other side responds.
At detection of connectivity operation receiving terminal: (1) receives the data of originating end, resolution data message.(2) confirm as detection of connectivity data message and for subtype be detection of connectivity request message.(3) construct detection of connectivity and reply message, except change subtype is for replying data subtypes, remainder data is constant.(4) to exchange in the data that receive source MAC and target MAC (Media Access Control) address position in bearing bed data message, and recalculate effect with.Remainder data is filled successively according to bearing bed data message header encapsulation form.(5) ethernet format encapsulates this data message, and sends datagram to originating end.
Again get back to originating end: the detection of connectivity that (1) is responded opposite end if receive replys message, then resolve this data message.(2) confirm whether this data message is detection of connectivity data message and replys message for the detection of connectivity responding local terminal request.(3) if this data message is the detection of connectivity responding local terminal reply message, then deduct the time value left in this message by current time, obtain two-way time.(4) if timer expiry does not receive the detection of connectivity reply message that the other side responds yet, then assert that opposite end is unreachable.
Utilize method provided by the invention, can effectively realize in data link layer based on data link layer ethernet mac address detection of connectivity.The specific implementation of the detection of connectivity in technique scheme is only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. realize a method for detection of connectivity based on data link layer ethernet mac address, it is characterized in that, comprising:
A, detection of connectivity operation originating end structure detection of connectivity request message, and target MAC (Media Access Control) address, VLAN and precedence field are set; The type of described detection of connectivity request message is request message type, and the encapsulation format of message is: type+code+inspection and+identifier+sequence number+option data, has has wherein filled in and issued the time in option data;
B, described detection of connectivity request message is encapsulated in the public heading of loading multi-protocols; The encapsulation format of described public heading is: version number+COS+payload length+reserved place+jumping figure+protocol type+source MAC+source vid+ target MAC (Media Access Control) address+object vid, the data message type that agreement is carrying detection of connectivity is set, payload length is the length of detection of connectivity request msg message, source MAC and destination MAC Address are respectively detection of connectivity and operate originating end and receiving terminal MAC Address, and source vid and object vid is default value zero;
C, target MAC (Media Access Control) address, VLAN and precedence field according to set generate detection of connectivity ethernet data frame;
D, search mac address forwarding table according to target MAC (Media Access Control) address and determine port, if find outbound port, only send detection of connectivity ethernet frame to the port found;
The receiving terminal that E, target MAC (Media Access Control) address are specified records packet receiving physical port, VLAN and source MAC address information after receiving connectivity testing message, generate detection of connectivity by source MAC in interchange of data message and target MAC (Media Access Control) address content and reply message, then the physical port preserved during by receiving message sends detection of connectivity reply message;
F, detection of connectivity operation originating end wait-receiving mode end is responded detection of connectivity and is replied message, if receive detection of connectivity at the appointed time to reply message, exports the testing result of connection, otherwise exports inaccessible testing result.
2. the method realizing detection of connectivity based on data link layer ethernet mac address according to claim 1, is characterized in that, in described step D, if search less than outbound port, then sends detection of connectivity ethernet frame to all physical ports.
3. the method realizing detection of connectivity based on data link layer ethernet mac address according to claim 1, is characterized in that, the content of described detection of connectivity request message also comprises initiation time, transmitting terminal process identification (PID) and sequence number.
4. the method realizing detection of connectivity based on data link layer ethernet mac address according to claim 1, is characterized in that, described public heading comprises version number, protocol type, jumping figure, payload length, source MAC and target MAC (Media Access Control) address.
5. the method realizing detection of connectivity based on data link layer ethernet mac address according to claim 1, it is characterized in that, in described step F, calculate two-way time after described detection of connectivity operation originating end receives detection of connectivity reply message and export.
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| CN110266560B (en) * | 2019-06-25 | 2021-04-27 | 宁波三星医疗电气股份有限公司 | Communication test method and device, storage medium and electronic equipment |
| CN115134271B (en) * | 2021-03-22 | 2023-07-25 | 湖南智领通信科技有限公司 | Fault detection method and device for IP transparent transmission ad hoc network and computer equipment |
| CN113890838A (en) * | 2021-09-24 | 2022-01-04 | 天津津航计算技术研究所 | Network connectivity judgment method based on ICMP (Internet control protocol) |
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| CN1968163A (en) * | 2006-10-25 | 2007-05-23 | 华为技术有限公司 | Method for service channel detection and system for providing the same |
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Effective date of registration: 20170410 Address after: 430074 East Lake high tech Development Zone, Hubei Province, No. 6, No., high and new technology development zone, No. four Patentee after: Fenghuo Communication Science &. Technology Co., Ltd. Address before: No. 5 light communication building 430074 Hubei province Wuhan Dongxin Development Zone East Lake Road, 3 floor Patentee before: Wuhan Fenghuo Network Co., Ltd. |