CN105162615A

CN105162615A - Snmp single-chip microcomputer implementing method

Info

Publication number: CN105162615A
Application number: CN201510426439.5A
Authority: CN
Inventors: 马晓光; 吴登勇; 陈乃阔
Original assignee: Shandong Chaoyue Numerical Control Electronics Co Ltd
Current assignee: Shandong Chaoyue Numerical Control Electronics Co Ltd
Priority date: 2015-07-20
Filing date: 2015-07-20
Publication date: 2015-12-16

Abstract

The invention discloses a snmp single-chip microcomputer implementing method. The method is characterized by dividing an object identifier OID in a dot manner from the top of the OID and enabling all MIB variables to start from a 1.3.6.1.2.1 identifier; converting the OID and a value to be transferred into a TLV format and the sending the TLV format by using a packaging algorithm; enabling the packaging to be performed from low addresses to high addresses and enabling the sending to be performed from high addresses to low addresses; at a data receiving end, enabling a de-packaging algorithm to separate the OID from the value, wherein when de-packaging is performed, whether a synchronization bit, an address, and CRC verification are correct are determined first, then analysis is performed according to a SNMP data format from front to back according to a length and values are assigned to corresponding variable values. The method achieves data packaging, sending, receiving and de-packing functions by using a single-chip microcomputer, improves the network management efficiency of a network administrator, timely finds out and solves network problems, plans network increase, and acquires network problems by using a SNMP to receive the notification messages and alarm event reports of network nodes.

Description

A kind of chip microcontroller method of snmp

Technical field

The present invention relates to technical field of computer network management, be specifically related to a kind of chip microcontroller method of snmp.

Background technology

Simple Network Management Protocol (SNMP) is the network management standard based on TCP/IP protocol suite, is a kind of standard agreement of managing network node in an ip network.SNMP can make network manager improve network management usefulness, and Timeliness coverage also solves the growth of network problem and planning network.Notification message and alarm event report etc. that network manager can also receive network node by SNMP know network produced problem.

SNMP realizes the information interaction between managing process and agent process by definition get-request, get-next-request, set-request, get-response and trap five kinds of operations.When network normally works, SNMP can realize the functions such as statistics, configuration and test; And when network failure, various error detection occurs and restore funcitons can be realized.

Summary of the invention

The technical problem to be solved in the present invention is: the present invention is based on 5 kinds of operations that SNMP defines, and utilizes single-chip microcomputer to realize the group bag of data, transmission, reception conciliate packet function.Use single-chip microcomputer to do SNMP data processing, completing the group bag of data by expanding external RAM, sending, receive and unpacking.

The technical solution adopted in the present invention is:

A chip microcontroller method of snmp, object identifier OID starts with a separation from top, all mib variables are all from 1.3.6.1.2.1 mark; Anti-histamine release converts OID to TLV form with the value value that will transmit and sends; Group bag, from low address to high address, carries out from high address to low address during transmission; Wherein, in TLV form, T is data type, and L is byte number shared after data V conversion, and V is data value; At data receiver, unpack algorithm and OID and value are separated, first judge when unpacking that whether sync bit, address and CRC check be correct, then analyze according to SNMP data format from front to back according to length, and give corresponding variate-value assignment.

Described method specific implementation step is as follows:

1) in anti-histamine release, first data length conversion is carried out, it is the byte number after TLV form shared by V that length represents data transformations, if this value is less than 128, then represent length by a byte, if length is more than or equal to 128, need to represent length by multiple byte; Wherein first character joint first place puts 1, after byte number needed for 7 bit representation data, the physical length of byte representation data subsequently;

2) value transmitted in system, all with character style transmission, directly send 04H character types, 01H length byte, then the value that will send directly sends when responding;

3) public SNMP stem and get/set stem are added to Variable-Bindings part, composition SNMP layer, when being free from mistakes, only need moving hand on one side, while corresponding variate-value is assigned in the address of pointer indication, then SNMP is put into MAC layer, carry out the calculating of CRC check value, send to host computer;

4) unpack algorithm OID and value are separated, first judge when unpacking that whether sync bit, address and CRC check be correct, then analyze according to SNMP data format from front to back according to length, and give corresponding variate-value assignment.

The message format of described SNMP comprises: version, community, PDU type, request identifier, error state, error index, wherein:

Version field writes the version-1 of SNMP used;

Community is the plaintext password between managing process and agent process;

PDU field, according to the type of PDU, inserts a numeral in 0 ~ 4;

Request identifier is the integer value arranged by managing process, and agent process also will return this request identifier when sending get-response message;

A numeral in corresponding states 0 ~ 5 is inserted when error state is and is answered by agent process;

Error index field is an integer shifts, indicates when there being mistake to occur, and which parameter is mistake occur in.

Beneficial effect of the present invention is:

The present invention is based on 5 kinds of operations that SNMP defines, utilize single-chip microcomputer to realize the group bag of data, transmission, reception conciliate packet function, network manager is made to improve network management usefulness, Timeliness coverage also solves the growth of network problem and planning network, and the notification message and alarm event report etc. that can also receive network node by SNMP know network produced problem.

Accompanying drawing explanation

Fig. 1 is SNMP message format schematic diagram;

Fig. 2 is system realization flow figure;

Fig. 3 is for unpacking algorithm flow chart.

Embodiment

With reference to the accompanying drawings, by embodiment, the present invention is further described:

Embodiment 1:

Embodiment 2:

As shown in Figure 2, on the basis of embodiment 1, described in the present embodiment, method specific implementation step is as follows:

4) unpack algorithm OID and value are separated, first judge when unpacking that whether sync bit, address and CRC check be correct, then analyze according to SNMP data format from front to back according to length, and give corresponding variate-value assignment, the whole process unpacked as shown in Figure 3.

Embodiment 3:

As shown in Figure 1, on the basis of embodiment 1 or 2, described in the present embodiment, the message format of SNMP comprises: version, community, PDU type, request identifier, error state, error index, wherein:

Version field writes the version-1 of SNMP used, namely for SNMPv1, then needs to insert 0 value;

Community is the plaintext password between managing process and agent process, usually write " public ";

PDU field, according to the type of PDU, inserts a numeral in 0 ~ 4;

Above execution mode is only for illustration of the present invention; and be not limitation of the present invention; the those of ordinary skill of relevant technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.

Claims

1. a chip microcontroller method of snmp, is characterized in that: object identifier OID starts with a separation from top, and all mib variables are all from 1.3.6.1.2.1 mark; Anti-histamine release converts OID to TLV form with the value value that will transmit and sends; Group bag, from low address to high address, carries out from high address to low address during transmission; At data receiver, unpack algorithm and OID and value are separated, first judge when unpacking that whether sync bit, address and CRC check be correct, then analyze according to SNMP data format from front to back according to length, and give corresponding variate-value assignment.

2. the chip microcontroller method of a kind of snmp according to claim 1, is characterized in that, described method specific implementation step is as follows:

1) in anti-histamine release, first carry out data length conversion, if length is less than 128, then represent length by a byte, if length is more than or equal to 128, need to represent length by multiple byte; Wherein first character joint first place puts 1, after byte number needed for 7 bit representation data, the physical length of byte representation data subsequently;

3. the chip microcontroller method of a kind of snmp according to claim 1 and 2, is characterized in that: the message format of described SNMP comprises: version, community, PDU type, request identifier, error state, error index, wherein:

Version field writes the version-1 of SNMP used;

Community is the plaintext password between managing process and agent process;

PDU field, according to the type of PDU, inserts a numeral in 0 ~ 4;