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303542-A Rev 00
Chapter 2
SNMP, BootP, DHCP, and RARP Concepts
SNMP Overview .............................................................................................................2-1
SNMP Messages .....................................................................................................2-2
SNMP Communities .................................................................................................2-3
SNMP Implementation Notes .........................................................................................2-4
Internet Protocol .......................................................................................................2-4
Events and Traps .....................................................................................................2-4
Protocol Entities .................................................................................................2-5
Severity Levels ...................................................................................................2-5
SNMP Trap Format ............................................................................................2-6
Thresholds ...............................................................................................................2-7
Threshold Example ..................................................................................................2-8
Event Message Format ......................................................................................2-8
State of a Threshold ..........................................................................................2-9
Memory Considerations .....................................................................................2-9
BootP Relay Agent Overview .......................................................................................2-10
DHCP Overview ...........................................................................................................2-14
Acquiring a New IP Address and New Configuration Parameters .........................2-15
Identifying DHCP Servers ................................................................................2-16
Requesting and Receiving IP Information .......................................................2-18
Accepting or Declining IP Information .............................................................2-18
Acquiring the Same IP Address Again ...................................................................2-19
RARP Overview ............................................................................................................2-20
Chapter 3
Customizing SNMP
Summary of SNMP Configuration Tasks
Using the BCC and Site Manager ..................................................................................3-2
Customizing SNMP Global Parameters ..........................................................................3-3
Disabling and Reenabling SNMP .............................................................................3-3
Enabling and Disabling SNMP Lock Mechanism .....................................................3-4
Specifying a Lock Address .......................................................................................3-6
Specifying a Lock Timeout Value .............................................................................3-6
Enabling and Disabling Authentication Failure Traps ...............................................3-7
Specifying the Type of Service for the SNMP Packet ...............................................3-9
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