CITA 440 Week 6 SNMPv1. Internet SNMP Management Internet Engineering Task Force (IETF) –1990SNMPv1 –1996SNMPv2 –1998SNMPv3 Internet documents: –Request.

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Presentation transcript:

CITA 440 Week 6 SNMPv1

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)

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

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)

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

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

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

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

Security Parameters

RFC 1157

Packet Format

Get and Set Type PDUs

RFC 1157

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

Trap PDU

Generic Traps