1. CITA 440 Week 6 SNMPv1

2. Internet SNMP Management Internet Engineering Task Force (IETF) –1990SNMPv1 –1996SNMPv2 –1998SNMPv3 Internet documents: –Request for Comments (RFC) –Standard RFC (STD) –For Your Information RFC (FYI)

3. SNMPv1 Messages Get-Request: Sent by manager requesting data from agent Get-Next-Request: Sent by manager requesting data on the next entity to the one specified Get-Response: Agent responds with data for get and set requests from the manager Set-Request: Initializes or changes the value of network element Trap: Alarm generated by an agent

4. Information Model Structure of Management Information (SMI) (RFC 1155) Managed Object –Scalar (has a single instance and is identified by ".0") –Aggregate or tabular object (can have one or more instances and is identified by its index value) Management Information Base (RFC 1213)

5. Message Data get-request message from manager has NULL for value fields get-response from agent has the values filled in

6. SNMP APPLICATION Class TypeTag IpAddress APPLICATION 0 Counter APPLICATION 1 Gauge APPLICATION 2 TimeTicks APPLICATION 3 Opaque APPLICATION 4

7. SNMP Community Security in SNMPv1 is community-based (authentication scheme in manager and agent) Community: Pairing of two application entities Community name: String of octets Two applications in the same community communicate with each other Application could have multiple community names Communication is not secured in SNMPv1 - no encryption

8. Community Profile MIB view: An agent is programmed to view only a subset of managed objects of a network element Access mode: Each community name is assigned an access mode (read-only and read-write) Community profile: MIB view + access mode Operations on an object determined by community profile and the access mode of the object Total of four access privileges Some objects, such as table and table entry are non-accessible

9. Security Parameters

10. RFC 1157

11. Packet Format

12. Get and Set Type PDUs

13. RFC 1157

14. Trap Generic trap –coldStart –warmStart –linkDown –linkUp –authenticationFailure –egpNeighborLoss –enterpriseSpecific Specific trap: For special measurements such as statistics Time stamp: Time since last initialization

15. Trap PDU

16. Generic Traps