SNMP Agent Device Edit
The DEVICES section in the SNMP server (agent) specify which remote SNMP devices traps or informs should be sent to as a result of the trap send rules.
Number – A number ranging from 1 to device table size, and was historically referenced in read and write maps as the device to which the map applied. However, with the implementation of device mask in the SNMP agent, the mask is what actually determines which device(s) the trap is sent to, and the same trap may be sent to multiple devices with only one trap rule as a result of the mask implementation. This number is therefore simply a row number on the list for database reference.
Name – Simply a reference in the web UI for the user to identify this device.
PeerName – Provides a definition of where on the network to find the device. The peername in simplest form will be an IP address as illustrated in the XML file example above. However, if the network has access to a DNS server and that server is configured in the network settings of the local device, then peername may be any name that can be found via DNS lookup.
Version – Specifies what SNMP version should be used to send the trap, which in turn determines certain aspects of how the trap message is formatted. Version may be 1, 2, or 3 where 2 really means v2c.
Community – Is the community string as defined for SNMP v1 and v2c.
Device Group – Select which groups this device is a member of. The device group allows selectively sending the same trap to multiple devices. Both the trap send rules and the trap devices have a group association. When the group association of a trap rule matches the groups that the device is a member of, the trap will be sent to that device, and all devices included in the group.
The group selection is made as a bit mask labeled "DevMask" in CSV and XML files. Group "A" is bit 0 or value of 1. Group "B" is bit 1 or value of 2. Group "C" is bit 2 or value of 4, and so on. The mask is the summation of the groups. Only the first 8 bits are used in the web UI for ease of use. Internally, the test for group membership is a simple logical AND of the mask values found in the trap rule and the device configuration.
SNMPv3 Configuration - The following parameters are used only for v3
Security Level - Sets security level, 1=noAuthNoPriv, 2=authNoPriv, 3=authPriv. Those are the SNMP acronyms meaning (1) no authentication or privacy, (2) authentication required but privacy is not, (3) both authentication and privacy are required. The term “privacy” means encryption.
User Name - Sets the SNMP security name, analogous to username in SNMP terms.
Authentication Type - Sets the authentication type, may be “NOAUTH”, “MD5”, or “SHA”. It determines how the username (security name) is hashed when transmitted.
Authentication Phrase - Sets the authentication phrase, analogous to an SNMP password.
Privacy Type - Sets the privacy type, may be “NOPRIV”, “DES”, or “AES”. This determines which encryption algorithm will be used.
Privacy Phrase - Sets the privacy phrase which is used as the encryption key.
EngineId - Sets the engine ID that will be sent with the trap message if SNMPv3. (Used only for SNMPv3.)
NOTE: The engine ID will be taken as a literal ASCII string (and probably not work) if it does not begin with “0x”. The recipient of an SNMPv3 trap will generally discard it if the engine ID does not match its own engine ID. It is necessary to know quite a bit about where you are sending traps with v3.