A WebLogic Server SNMP agent can always communicate with managers using the SNMPv3 protocol. You can configure whether the agent also supports the SNMPv1 and v2 protocols. While you cannot prevent an agent from receiving SNMPv3 requests, an agent processes only requests from known users that you configure through the WebLogic Server security realm.
Note: The SNMP page also displays a Domain SNMP Agent table, which provides access to the domain-scoped SNMP agent. This agent is provided to support domains that were created with WebLogic Server release 9.2 and earlier. BEA recommends that you do not use this agent for new domains. For more information, see Use SNMP to monitor WebLogic Server.
Once you create an SNMP agent, you cannot change its name. Instead, you must delete it and create a new one.
An SNMP agent communicates through a port that accepts UDP traffic and another port that accepts TCP traffic. By default, all TCP traffic uses the host server's listen port. For example, if you target this agent to a server named ManagedServer1 and ManagedServer1 listens for requests on port 7001, then the SNMP agent listens for TCP requests on port 7001. When communicating through a TCP port, WebLogic Server protects SNMP communication from denial of service (DOS) attacks.
If you want to separate SNMP TCP traffic from business traffic, you can create a custom network channel. See Create an SNMP network channel.