The ASA provides support for network monitoring using SNMP versions 1, 2c, and 3 and supports the use of all three versions simultaneously. SNMP has three versions: SNMPv1, SNMPv2c, and SNMPv3. Traps ensure that the NMS gets information if a certain event occurs on the device that needs to be recorded without being polled by the NMS first. SNMP traps allow an agent to send device information to the manager over Port UDP 162. Traps are used when the Device needs to alert the network management software of an event without being polled. The agent also controls access to the agent’s MIB, the collection of objects that can be viewed by the SNMP manager. The agent responds to requests for information and actions from the manager. The SNMP agent exchanges network management information with the SNMP manager software running on an NMS, or host. SNMP agent-The SNMP agent is the SNMP process that resides on the managed device and communicates with the NMS. Managed device-A managed device is any device on a network that is managed by the NMS.The manager software polls the agents over Port UDP 161 (Default port and can be configured to custom port as well). The manager polls the devices on your network as you specify for information about network connectivity, activity, and events. Network management system (NMS)-A combination of hardware (devices) and software (the SNMP manager) that is used to monitor and administer a network.A typical SNMP implementation includes three components: Simple Network Management Protocol (SNMP) is an application layer communication protocol that lets you monitor managed network devices. If your network is live, ensure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. SolarWinds Network Performance Monitor (Network Management System) There are no specific requirements for this document. Knowledge of SNMP and basics of ASA Requirements This document describes the SNMP Configuration, Verification and Troubleshooting on ASA appliances.
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