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1–SNMP Overview
Management Information Base
59047-10 D 1-3
Management Information Base
Management information bases (MIBs) define the properties of the managed
object within the device to be managed. Every managed device keeps a database
of values for each definition written in the MIB. It is not the actual database itself; it
is implementation dependant. Definition of the MIB conforms to the Structure of
Management Information (SMI) given in Request For Comment (RFC) 1155. The
latest Internet MIB is given in RFC 1213, and is sometimes called MIB-II.
User Datagram Protocol
QLogic switches support the following User Datagram Protocol (UDP) settings:
Agents “listen” on UDP port 161.
Responses are sent back to the originating Network Management Station
(NMS) port from a dynamic port, although many agents use port 161 also for
this target.
The maximum SNMP message size is 65507 octets (maximum UDP
message size).
The minimum receive packet size for SNMP implementations is 484 octets
in length.
Agent and Network Monitoring Systems are responsible for determining
error recovery.
Table 1-1. Trap Severity Levels
Event Type Severity Level
Unknown 1
Emergency 2
Alert 3
Critical 4
Error 5
Warning 6
Notify 7
Info 8
Debug 9
Mark 10