SNMP which is Simple Network Management Protocol for Monitoring Network Devices

1. By: Sweta Dargad
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2. *
*SNMP has become the most popular network management
protocol for its simplicity and scalability.
*Simple Network Management Protocol (SNMP) is commonly
used within NMS(Network Monitoring System)
*Tools like Cacti and OP Manager use SNMP for querying
devices.
*SNMP is the de-facto standard for Network Monitoring.
*SNMP is integrated into most of devices like routers,
switches, servers and workstations.

3. *
*SNMPv1 :Simple Network Management Protocol
(RFC1213)has MIB2
*SNMPv2c: (RFC1907) includes security, confidentiality
*SNMPv3 :(RFC2275)addition of cryptographic security
ensures confidentiality, integrity and authentication
*It is Internet-standard protocol for managing devices on
IP networks
*community Strings :Read Only and Read write

4. *
*An SNMP-managed network includes
management stations and network devices
*Agent software which runs on managed devices
*Network management system (NMS) software
which runs on the manager
*MIB (Management Information Base), can
monitor the state of hardware and software,
and the running state of the system.

5. *
SNMP sends and receives information on port UDP 161 and 162

6. *
The collection of objects is referred to as management
information bases (MIB)This MIB tree gives the OId(Object Id)

7. *

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9. *
*Net-SNMP is a suite of applications used to implement
*SNMPv1, SNMPv2c and SNMPv3 using both IPv4 and IPv6
*A library for developing new SNMP applications, with
both C and perl APIs
*Information from snmp enabled device is collected by
commands like
• snmpget
• snmpgetnext
• snmpwalk
• snmpset
• snmptrap

10. *
1. Snmpget: request to query for information on a network entity
Eg: snmpget -v1 -c public localhost system.sysUpTime
Or snmpget –v1 –c private 127.0.0.1 1.3.6.1.2.1.1.3
Here system.sysUpTime is named OId of 1.3.6.1.2.1.1.3 which be
can get by
2. snmptranslate 1.3.6.1.2.1.1.3 and vice-versa.
Similarly
3. snmpwalk: is an SNMP application that uses SNMP GETNEXT
requests to query a network entity for a tree of information.
4. snmpset: is used to set the information from users terminal