HP StorageWorks XP24000 SNMP Agent Reference Guide, v01 (AE131-96006, June 2007)

• SNMP uses the TCP/IP User Datagram Protocol (UDP) . If the SNMP agent doesn’t respond within
aspecified time period, the SNMP manager re-sends the request packet. That time period is set
by the system adm inistrator, taking into account the net work traffic and operation policy.
• If an SNMP agent again does not respond to the re-sent packet, the SNMP ma n ager assumes
that an error has occurred. Depending on the times set for polling and response, this can take
several seconds.
If an SNMP ag ent 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 po lling and traps to determine whether an abnormal event has occurred.
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