•Mainly SNMP is a request‐and‐response protocol.
The Simple Network Management Th Si l N t kM t Protocol (SNMP) Protocol (SNMP) •An Internet‐standard protocol for managing devices on IP networks. •Many kinds of devices support SNMP, eg routers, switches, servers, workstations, printers, modem racks, UPS etc •SNMP helps to monitor simple and standardized items, eg g •Amount of traffic flowing into or out of an interface • Air temperature inside a router. Etc
•Devices on the network, contain information about themselves. themselves •Devices keep information about the Status & Devices keep information about the Status & Health on neighbourhood devices & It Self •This information is the heart of Simple Network Management Protocol –SNMP
Network Management and Monitoring Network Management and Monitoring • What operations do you carry out using SNMP h i d i e.g – Shutdown an interface on a router or switch – monitor temperature on a switch and give a p g warning when it is too high or too low
• Remote Network Monitoring (RMON) was g( ) developed to help us understand how the network itself is functioning,eg network itself is functioning,eg – It can be used to monitor not only LAN traffic, but WAN interfaces as well WAN interfaces as well
Before and After SNMP
• SNMP's predecessor is the Simple Gateway Management Protocol (SGMP), Management Protocol (SGMP) • SGMP was Limited to managing Internet routers • SNMP can be used to manage – Unix systems, Unix systems, – Windows – systems, t – printers, – modem racks, power – supplies, and more and even software supplies, and more and even software
Human Considerations Human Considerations
• Network management requires human resource but at the same time, network management is intended to reduce the workload of your system administration staff. workload of your system‐administration staff • There is no way to predetermine how many people you will need to maintain a l ll management system. The size of the staff varies depending on the size and complexity of the network you re managing. of the network you're managing.
SNMP Versions SNMP Versions
• Three versions of SNMP exist. • Version 1 and 2 have a number of Version 1 and 2 have a number of common features. • Version 2 has additional protocol i 2h ddi i l l operations. p • Version 3 has Enhanced security support where a community name must b h it t be supplied for authentication
SNMP Version 1 (SNMPv1)
• It's defined in RFC 1157 and is a full IETF standard. d d • Security is based on communities, which are Secu ty s based o co u t es, c ae nothing more than passwords: plain‐text strings that allow any SNMP‐based application strings that allow any SNMP based application that knows the strings to gain access to a device's management information. d i ' ti f ti • There are typically three communities in yp y SNMPv1: read‐only, read‐write, and trap.
SNMP Version 1 (SNMPv1) SNMP Version 1 (SNMPv1)
• Most common Management protocol used in data networks. • Based on Manager‐Agent model • U Uses MIB to exchange information MIB h i f i • All commands use UDP / IP protocol – / p connectionless • O Operates at Layer 7 –Application layer t tL 7 A li ti l
SNMP Version 2 (SNMPv2) SNMP Version 2 (SNMPv2)
• Referred to as community string‐based SNMPv2. • It's defined in RFC 1905, RFC 1906,and RFC 1907, and is an experimental IETF. Even though it's p g...