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McDATA SNMP Support
2
E/OS Trap Overview
NOTE: All E/OS traps are SNMPv1 format, regardless of MIB definition
syntax.
SNMP traps are specific types of SNMP messages enclosed in UDP
packets as shown:
[ IP Packet [ UDP Packet [ SNMP Message ] ] ]
The SNMP message format is:
[ Version | Community | SNMP PDU ]
There are different formats for the SNMP PDUs, including trap
PDUs, for SNMPv1 and SNMPv2. These are summarized here:
SNMPv1 Trap PDU:
[ Enterprise | Agent address | Generic trap type | Specific trap code
| Time stamp | Object/Value 1 | Object/Value 2.... ]
The following descriptions summarize these fields:
Enterprise—Identifies the type of managed object generating the
trap.
Agent address—Provides the address of the managed object
generating the trap.
Generic trap type—Indicates one of a number of generic trap types.
Specific trap code—Indicates one of a number of specific trap codes.
Time stamp—Provides the amount of time that has elapsed between
the last network reinitialization and generation of the trap.
Variable bindings—The data field of the SNMPv1 Trap PDU. Each
variable binding associates a particular object instance with its
current value
The following descriptions summarize the fields illustrated below for
the SNMPv2 PDU format:
PDU type—Identifies the type of PDU transmitted (Get, GetNext,
Inform, Response, Set, or Trap).
Request ID—Associates SNMP requests with responses.
E/OS Trap Overview
2-3
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