About SNMP Trap and Inform Notifications
You can configure the Cisco MDS switch to send notifications to SNMP managers when particular events occur. You can send these notifications as traps or informs. Traps are unreliable because the receiver does not send any acknowledgment when it receives a trap. The sender cannot determine if the trap was received. However, an SNMP manager that receives an inform acknowledges the message with an SNMP response PDU. If the sender never receives a response, the inform is normally retransmitted. Thus, informs are more likely to reach their intended destinations.
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