Analysis of the ROADM equipment management software based on SNMP

This paper introduced one kind based on the SNMP protocol for ROADM network management agent software design and implementation of the program, the method can simplify the design and implementation of Agent, such that Agent put more resources on equipment management and real-time task coordination operation. This scheme can also be used for other equipment. 1 Introduction In recent years, IP, data, video and other business to carry out a wide range of rapid consumption of the optical fiber bandwidth, already matched wavelength is gradually occupied, business development presents the dynamic characteristics. WDM system in expanding its scale at the same time, bound to a new generation of WDM system ULH+ROADM transformation. ROADM ( reconfigurable optical add-drop multiplexer ) with its convenient configuration, can change the wavelength resource allocation, can meet the dynamic needs of the business, and according to the need for intermediate the upper and lower nodes of the wavelength number and the specific wavelength, can avoid wavelength blocking and constructing end-to-end virtual wavelength path [1]. ROADM is ASON key nodes. In the metropolitan area network construction, selection of ROADM equipment, not only can reduce operating costs, ensure the business flexible development, to ensure that the required bandwidth, provide transparent, efficient transmission and exchange; can realize flexible networking, in favor of ASON flow control; and for a smooth transition to next generation network ready. The realization of ROADM mainly have two kinds of train of thought, broadcast / selection type and demultiplexing / multiplexing / cross. Broadcast / selection type ROADM equipment by tunable filter and wavelength blocking filter component. The demultiplexing / Cross / multiplex ROADM device usually adopts the wave division multiplexer / demultiplexer, coupled with controllable light switch [2]. With the rapid development of hardware chip and processor, ROADM equipment single disk can have more processing. So you can be a specific task processing in single disc, instead of Agent to realize. Following the presentation of a ROADM device design and realization scheme of network management agent. This program on ROADM equipment performance, alarm, configuration and proprietary commands and other special treatment, simplified in the command processing module and the response frame processing modules. This can make Agent design more concise, focusing on equipment management and real-time task coordination operation, so that the ROADM device can real-time response network management needs and timely reporting of network information, in order to better the performance of the work. The 2SNMP protocol Based on SNMP protocol simple network management framework, because of the popularity of Internet and get rapid promotion, becoming one of the important technology of network management. SNMP is in the process of constant development, now has SNMPv1/v2/v3 in three main versions; in addition, remote network monitoring ( RMON ) appear to make SNMP to the distributed management to stride one stride. The network management of SNMP model includes four key components: Management ( Manager ), agent ( Agent ), management information base ( MIB ) and network management protocol ( SNMP ), as shown in figure 1. Manager running SNMP client ( Client ) program and network application software, will be responsible for network management commands to the Agent, extracted from the MIB management information and receive from the Agent abnormal event report. The Agent running SNMP server ( Server ) program and MIB handling procedures, is responsible for receiving network management command and MIB implementation of related operations, reported the incident. MIB: preservation and tissue from the tube being cyber source abstract management information. SNMP:Manager and Agent exchange between management information communication rules, is generally based on the realization of the TCP/IP. 3 design and implementation of software 3.1ROADM equipment network management SNMP protocol based on ROADM equipment network management model as shown in figure 2. Diagram of network management agent ( Agent ) as the ROADM equipment and station between the bridges, is running in the managed devices ( ROADM ) in the software, implementation of management process management operation, direct the operation of the local management information base on [3]. The ROADM device Agent with response management station command, collection ROADM equipment information, configuration of ROADM equipment, ROADM equipment information and command execution results are sent to the management station, send TRAP to the management station, save the configuration information and other functions. ROADM Agent MPC860 was selected as the running equipment software hardware platform, operating system using VxWorks embedded real-time multitask operating system; the MPC860 and equipment of each disc communication through MPC860 SPI port to achieve. It can realize the real-time monitoring of equipment, good management performance. Design and implementation of 3.2MIB According to SNMP agreement [4], all managed objects are arranged in a tree structure, in the leaf position on the object is the actual managed objects, each practical managed objects representing some managed resources, activities or the related information. Tree structure itself defines an object to the set of logically related method. ROADM Agent ROADM equipment equipment management system information ( equipment name, device type, device manufacturers, device address ), the operation status of equipment ( alarm or normal ), slot ( slot type information, slot boards in information ), single disc basic information ( hardware, software version, version of the manufacturer information ), single wheel running ( alarm or normal ), single disc temperature, port basic information and port running state. ROADM MIB as shown in figure 3. 3.3 software design ( module ) In accordance with the ROADM device Agent to realize the function of Agent software, will be divided into the following several modules, each module to achieve a specific function, with each other through the function interface link. ROADM equipment Agent software module diagram as shown in figure 4. 3.4 the module realization The communication module: This module to establish socket connection, frame to network management request. From the received UDP packet analyzing the sources of information ( network IP address ). And the data in the UDP header pointer to command parsing module. Response message package module can call the function modules to send Trap or response information to the network management. In embedded systems, will generally be 161 port as the receiving station to the management station sends a request and response information to the port, and the 162 port is used to send Trap to the management station. Command parsing module: This module receives the UDP packet data blocks are analytic, remove community field validation information, to ensure that the legitimate operation; finally will parse out operation object and operation parameters to be passed to the command processing module, a command processing module on the operation of the equipment. The command processing module: This module to realize the management station to ROADM device sends the read, write command analysis and transmission. The process is illustrated in figure 5. First receives the command parsing module pass over the operation object and operation parameters. Then the operation object is analyzed by OID, to find the corresponding device properties ( Equipment, Slot, Card attribute attribute attribute or the Port property ). According to the hardware layer protocol device attributes and attribute values are converted into hardware can identify the sixteen hexadecimal number, packaged into a data frame, was sent to the slave communication module. In response to the frame processing module: This module processing from the lower communication module to report information and response analysis of frame, corresponding managed object properties ( OID ) and managed object attribute values, delivered to the response message package module, and through the interface function to update the database. In alarm and important information to send Trap to Manager. Response message package module: This module will receive the managed object attributes and attribute values ( OID ) bound together, packaged into the appropriate PDU ( protocol data unit ) package, plus the community name and version number, transfer to the upper communication module. Configuration module: network management by the Set command, such as response frame returns to Set news, notice the configuration module will be the new configuration data stored in the database. The system to power up, the module is read out from the database last configuration data, through the command processing module to configure. The communication module: This module establishes a two message queues, one for the ROADM device to send data, another from a ROADM device receives the response frame. The realization of interactive information transparent transmission, completed by Agent software and ROADM communication between devices. The 4 ending ROADM in local / metropolitan area network application, caused various equipment manufacturers and operators of the eager attention. Especially the foreign operators on ROADM cast with high enthusiasm, have wanted to use ROADM to upgrade its infrastructure network idea, and prepare for the future deployment of ROADM technology.