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Introduction to SNMP

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Mohammed Farrah

SNMP is a set of protocols for managing network devices. It uses a manager-agent model where a manager controls and monitors agents, usually routers. SNMP relies on SMI to define object naming and types and MIB to create a collection of named objects and their relationships. Objects are given OIDs starting with 1.3.6.1.2. SNMP versions 1 and 2c provide limited security while version 3 adds authentication and encryption. SNMP uses community strings for authentication in versions 1 and 2c and username/password in version 3. Common packet types include get, set, and trap requests.

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Simple Network Management Protocol (SNMP) Presented by: Mohammed I. Farrah m.farrah.it@gmail.com Jan 2, 2012  
What is SNMP? ● It is a set of several protocol definitions for managing networks. ● SNMP uses the concept of manager and agent , which means a manager controls and monitors a set of agents (usually routers). Jan 2, 2012  
SNMP uses two other protocols : 1.Structure of Management Information (SMI): SMI defines the general rules for naming objects, defining object types + (range,length), and showing how to encode objects and values. Jan 2, 2012  
2.Management Information Base (MIB): MIB creates a collection of named objects, their types, and their relationships to each other in an entity to be managed. Jan 2, 2012  
● Object Identifier (OID): OID is use by SMI to name or idetify an object based on tree structure. ● All objects managed by SNMP is given an OID. ● In SNMP all OIDs starts with 1.3.6.1.2.1 Jan 2, 2012  
Jan 2, 2012  
SNMP Version 1, 2c and 3 ● SNMP Version 1: The oldest and most basic version of SNMP. ● simple to set up , but have limited security & only supports 32bit counters. Jan 2, 2012  
● SNMP Version 2c: the same but support 64bit counter to monitor bandwidth usage in networks with gigabits/second loads. ● SNMP Version 3: Adds authentication and encryption. Jan 2, 2012  
What is the “SNMP Community String”? ● The “SNMP Community string” is like a user id or password that allows access to a router or other device's statistics. ● It is used just in v1 and v2c. ● SNMPv3 uses username/password authentication, along with an encryption key. Jan 2, 2012  
SNMP packet types ● GetRequest (manager-to-agent) ● SetRequest (manager-to-agent) ● GetNextRequest (manager-to-agent) ● GetBulkRequest (manager-to-agent) ● Response (agent-to-manager) ● Trap (agent-to-manager) ● InformRequest (manager-to-manager) Jan 2, 2012  
DEMO Jan 2, 2012  
Question? Jan 2, 2012  
Thanks.. References: [book] data communications and networking,  behrouz a forouzan­fourth edition [chapter 28] Jan 2, 2012  

More Related Content

Introduction to SNMP

  • 1. Simple Network Management Protocol (SNMP) Presented by: Mohammed I. Farrah m.farrah.it@gmail.com Jan 2, 2012  
  • 2. What is SNMP? ● It is a set of several protocol definitions for managing networks. ● SNMP uses the concept of manager and agent , which means a manager controls and monitors a set of agents (usually routers). Jan 2, 2012  
  • 3. SNMP uses two other protocols : 1.Structure of Management Information (SMI): SMI defines the general rules for naming objects, defining object types + (range,length), and showing how to encode objects and values. Jan 2, 2012  
  • 4. 2.Management Information Base (MIB): MIB creates a collection of named objects, their types, and their relationships to each other in an entity to be managed. Jan 2, 2012  
  • 5. ● Object Identifier (OID): OID is use by SMI to name or idetify an object based on tree structure. ● All objects managed by SNMP is given an OID. ● In SNMP all OIDs starts with 1.3.6.1.2.1 Jan 2, 2012  
  • 7. SNMP Version 1, 2c and 3 ● SNMP Version 1: The oldest and most basic version of SNMP. ● simple to set up , but have limited security & only supports 32bit counters. Jan 2, 2012  
  • 8. ● SNMP Version 2c: the same but support 64bit counter to monitor bandwidth usage in networks with gigabits/second loads. ● SNMP Version 3: Adds authentication and encryption. Jan 2, 2012  
  • 9. What is the “SNMP Community String”? ● The “SNMP Community string” is like a user id or password that allows access to a router or other device's statistics. ● It is used just in v1 and v2c. ● SNMPv3 uses username/password authentication, along with an encryption key. Jan 2, 2012  
  • 10. SNMP packet types ● GetRequest (manager-to-agent) ● SetRequest (manager-to-agent) ● GetNextRequest (manager-to-agent) ● GetBulkRequest (manager-to-agent) ● Response (agent-to-manager) ● Trap (agent-to-manager) ● InformRequest (manager-to-manager) Jan 2, 2012