HP StorageWorks XP SNMP Agent Reference Guide: HP XP12000 Disk Array, HP XP10000 Disk Array, HP 200 Storage Virtualization System (AE002-96056, May 2011)

Error Reporting
Table 5 (page 9) shows errors to be reported for the REQUEST operations.
Table 5 SNMP Agent REQUEST Operations
Corrective ActionDescriptionError
N/ANormalnoError(0)
Verify that the requested object is correct.
• There are no MIB objects that are
required. (Not supported).
• The GETNEXT REQUEST command that
is specified for the following object
identifier of the last supported MIB object
is received.
noSuchName(2)
SET operation is not supported.SET REQUEST is received.readOnly(4)
Retry the operation.Error occurred for other reasons.genErr(5)
SNMP Manager and SNMP Agent Interaction
When an SNMP Manager polls the agent, the following dialogue takes place:
• An SNMP manager sends a request packet to an SNMP agent, which requests data regarding
the status of managed node.
• The SNMP agent sends a response packet back to the SNMP manager.
• SNMP uses the TCP/IP User Datagram Protocol (UDP). If the SNMP agent doesn’t respond
within a specified time period, the SNMP manager re-sends the request packet. That time
period is set by the system administrator, taking into account the network traffic and operation
policy.
• If an SNMP agent again does not respond to the re-sent packet, the SNMP manager assumes
that an error has occurred. Depending on the times set for polling and response, this can take
several seconds.
If an SNMP agent detects an abnormal event, it sends a trap to the SNMP manager. However, if
a trap is dropped in transmission, the SNMP manager doesn’t know that it was sent. For this
reason, you should use both polling and traps to determine whether an abnormal event has
occurred.
SNMP Manager and SNMP Agent Interaction 9