SVS 200 SNMP Agent Reference Guide (AE002-96035, October 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 administrator, taking into account the network trafﬁcandoperationpolicy.

• 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.

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