SNMP profiles are definitions that contain the information necessary to allow Data Collector to do queries of device MIB tables that use SNMP. Data Collector can communicate with devices that support SNMPv1, SNMPv2c, and SNMPv3. Community strings and credentials are encrypted when they are stored in CA Performance Center and when they are sent to Data Aggregator and Data Collector.
Important! When using SNMPv3 community names, CA Performance Management requires that any authentication passwords or privacy passwords are greater than eight characters in length. If they are configured with passwords that are shorter than eight characters in length, SNMPV3 profiles can be unsuccessful in communicating with devices.
Data Collector uses SNMPv1/SNMPv2c and SNMPv3 profiles during inventory discovery to determine what credentials to use when accessing a device. CA Performance Center maintains this list of profiles. Each profile is ranked for device access. During discovery, each profile is tried for device acccess. The profile with the highest rank that can access a device is used.
You can create SNMP profiles in CA Performance Center and you can change SNMP profiles rankings. A new ranked list of SNMP profiles takes effect in the following situations:
Otherwise, devices that are already being polled successfully continue to use the existing SNMP profile, regardless of any changes you made to the ranked list of SNMP profiles.
Note: If the SNMPv1/SNMPv2c profile is the highest ranked profile that can access a device and the device can be accessed with both SNMPv1 and SNMPv2c, Data Collector communicates with that device using SNMPv2c.
We tested Data Collector to determine the CPU load that is added when various SNMPv3 protocols are used. We found that SHA /AES had a moderate (< 30 percent) impact on CPU utilization as compared to SNMPv1. MD5/DES, SHA/DES, and SHA/3DES were found to have a major (>30 percent) impact on CPU utilization.
Note: The servers on which this testing was conducted have some AES capability that is built into the CPUs.
If you add additional CPU cores to your environment, Data Collector can balance the CPU load.
You create SNMP profiles in the CA Performance Center user interface or using the CA Performance Center REST web services. After you create the SNMP profiles, they synchronize immediately with Data Aggregator and are available for inventory discovery to use them.
Note: For more information about creating SNMP profiles, see the CA Performance Center Administrator Guide and the CA Performance Center REST Web Services Guide.
After you run a discovery, you can access the Discovery History view to see the list of SNMP profiles that are used and the highest ranked SNMP profile the device responded to.
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