FW 05.01.00 and SW 07.01.00 HP StorageWorks SNMP Reference for Directors and Edge Switches Reference Guide (AA-RQ7BD-TE, June 2003)

SNMP Support
23SNMP Reference for Directors and Edge Switches
EOS Trap Overview
All EOS traps are SNMPv1 format, regardless of MIB definition syntax.)
SNMP traps are specific types of SNMP messages enclosed in user datagram
protocol (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 protocol data units (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.
■ Error status—Indicates one of a number of errors and error types. Only the
response operation sets this field. Other operations set this field to zero.
■ Error index—Associates an error with a particular object instance. Only the
response operation sets this field. Other operations set this field to zero.