SNMP - Simple Network Management Protocol a monitoring siete

Matej Dujava, xdujava@fi.muni.cz

Example of OID:

    OID value: 1.3.6.1.2.1.4.1

    OID description:

    ipForwarding OBJECT-TYPE
                SYNTAX  INTEGER {
                            forwarding(1),
                            not-forwarding(2)
                        }
                ACCESS  read-write
                STATUS  mandatory
                DESCRIPTION
                        "The indication of whether this entity is acting
                        as an IP gateway in respect to the forwarding of
                        datagrams received by, but not addressed to, this
                        entity.  IP gateways forward datagrams.  IP hosts
                        do not (except those source-routed via the host).

                        Note that for some managed nodes, this object may
                        take on only a subset of the values possible.
                        Accordingly, it is appropriate for an agent to
                        return a `badValue' response if a management
                        station attempts to change this object to an
                        inappropriate value."
                ::= { ip 1 }
    

• 1 - ISO assigned OIDs
• 1.3 - ISO Identified Organization
• 1.3.6 - US Department of Defense
• 1.3.6.1 - OID assignments from 1.3.6.1 - Internet
• 1.3.6.1.2 - IETF Management
• 1.3.6.1.2.1 - SNMP MIB-2
• 1.3.6.1.2.1.4 - ipForwarding

citované z: http://www.alvestrand.no/objectid/1.3.6.1.2.1.4.1.html

Akcie:

• GET REQUEST - požiadavka na hodnotu určitého OID
• GETNEXT REQUEST - požiadavka na hodnotu nasledujúceho OID
• GET RESPONSE - odpoveď s hodnotou
• SET REQUEST - požiadavka na nastavenie OID na určitú hodnotu
• TRAP - správa od agenta bez vyžiadania od manažéra

Pridáva tieto akcie:

• GETBULK REQUEST - požiadavka na množinu nasledujúcich OID (zvýšenie výkonu pri prechádzaní celého MIB stromu)
• INFORM - ako TRAP, ale vyžaduje spetné doručenie REPORT
• REPORT - ACK na INFORM