Configuring Snmp; About Snmp; Snmp Functional Overview; Snmp Notifications - Cisco Nexus 7000 Series Configuration Manual

About SNMP

About SNMP
The Simple Network Management Protocol (SNMP) is an application-layer protocol that provides a message
format for communication between SNMP managers and agents. SNMP provides a standardized framework
and a common language used for the monitoring and management of devices in a network.

SNMP Functional Overview

The SNMP framework consists of three parts:
• An SNMP manager—The system used to control and monitor the activities of network devices using
• An SNMP agent—The software component within the managed device that maintains the data for the
• A managed information base (MIB)—The collection of managed objects on the SNMP agent
SNMP is defined in RFCs 3411 to 3418.
The device supports SNMPv1, SNMPv2c, and SNMPv3. Both SNMPv1 and SNMPv2c use a community-based
form of security.
Cisco NX-OS supports SNMP over IPv6.

SNMP Notifications

A key feature of SNMP is the ability to generate notifications from an SNMP agent. These notifications do
not require that requests be sent from the SNMP manager. Notifications can indicate improper user
authentication, restarts, the closing of a connection, loss of connection to a neighbor router, or other significant
events.
Cisco NX-OS generates SNMP notifications as either traps or informs. A trap is an asynchronous,
unacknowledged message sent from the agent to the SNMP managers listed in the host receiver table. Informs
are asynchronous messages sent from the SNMP agent to the SNMP manager which the manager must
acknowledge receipt of.
Traps are less reliable than informs because the SNMP manager does not send any acknowledgment when it
receives a trap. The device cannot determine if the trap was received. An SNMP manager that receives an
inform request acknowledges the message with an SNMP response protocol data unit (PDU). If the device
never receives a response, it can send the inform request again.
You can configure Cisco NX-OS to send notifications to multiple host receivers.
The following table lists the SNMP traps that are enabled by default.
Trap Type
generic
generic
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SNMP.
device and reports these data, as needed, to managing systems. The Cisco Nexus device supports the
agent and MIB. To enable the SNMP agent, you must define the relationship between the manager and
the agent.
Description
: coldStart
: warmStart

Configuring SNMP