Chapter 8 Using Simple Network Management Protocol 91
FIGURE 8-1 Sun Server MIB Tree
SNMP Messages
SNMP is a protocol, not an operating system, so you need some type of application
to use SNMP messages. Your SNMP management software might provide this
functionality, or you can use an open-source tool like net-SNMP, which is available
at
http://net-snmp.sourceforge.net/
Both management stations and agents use SNMP messages to communicate.
Management stations can send and receive information. Agents can respond to
requests and send unsolicited messages in the form of a trap. There are five
functions that management stations and agent, use:
■ Get
■ GetNext
■ GetResponse
■ Set
■ Trap
By default, port 161 is used for SNMP messages, and port 162 is used to listen for
SNMP traps.
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