• An SNMP manager—The system used to control and monitor the activities of network devices using
SNMP.
• An SNMP agent—The software component within Cisco UCS, the managed device, that maintains the
datafor CiscoUCS and reportsthe data, as needed,to theSNMP manager.Cisco UCS includes the
agentand a collection of MIBs. To enable the SNMP agent and create the relationship between the
managerand agent, enable and configure SNMP in Cisco UCS Manager.
• A managed information base (MIB)—The collection of managed objects on the SNMP agent. Cisco
UCSrelease 1.4(1) and higher support a larger number of MIBs than earlier releases.
CiscoUCS supports SNMPv1, SNMPv2c and SNMPv3. Both SNMPv1 and SNMPv2c use a community-based
formof security.SNMP is defined in the following:
• RFC 3410 (http://tools.ietf.org/html/rfc3410)
• RFC 3411(http://tools.ietf.org/html/rfc3411)
• RFC 3412 (http://tools.ietf.org/html/rfc3412)
• RFC 3413 (http://tools.ietf.org/html/rfc3413)
• RFC 3414 (http://tools.ietf.org/html/rfc3414)
• RFC 3415 (http://tools.ietf.org/html/rfc3415)
• RFC 3416 (http://tools.ietf.org/html/rfc3416)
• RFC 3417 (http://tools.ietf.org/html/rfc3417)
• RFC 3418 (http://tools.ietf.org/html/rfc3418)
• RFC 3584 (http://tools.ietf.org/html/rfc3584)
SNMP Notifications
Akey featureof SNMP is the ability to generate notifications from an SNMP agent. These notifications do
notrequire thatrequests be sentfrom theSNMP manager.Notifications can indicate improper user
authentication,restarts, the closing of a connection, loss of connection to a neighbor router, or other significant
events.
CiscoUCS Managergenerates SNMP notificationsas either trapsor informs.Traps are less reliable than
informsbecause the SNMP manager does not send any acknowledgment when it receives a trap, and Cisco
UCSManager cannot determine if the trap wasreceived. An SNMP manager that receives an inform request
acknowledgesthe message with an SNMP response protocol data unit (PDU). If the Cisco UCS Manager
doesnot receive the PDU, it can send the inform request again.
SNMP Security Levels and Privileges
SNMPv1,SNMPv2c, andSNMPv3 eachrepresent a differentsecurity model. The security model combines
withthe selected security level to determine the security mechanism applied when the SNMP message is
processed.
Thesecurity level determines the privileges required to view the message associated with an SNMP trap. The
privilegelevel determineswhether the messageneeds to beprotected fromdisclosure or authenticated.The
supportedsecurity level depends upon which security model is implemented. SNMP security levels support
oneor more of the following privileges:
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Configuring SNMP