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am.book : ch21 3 Tue May 6 13:24:47 1997
21-3
Chapter 21 Annex Manager and SNMP
Annex Manager User Guide
Part 4 Control and Status Commands
SNMP Agents
Annex software includes a process known as the SNMP agent. The agent
process acts as a server in a typical client-server model:
•
Annex Manager directs
get
,
set
, and
get-next
commands to the
agent.
•
The agent processes the command and returns a response
indicating the success or failure of the command and returning
the requested data for the
get
and
get-next
commands.
Message Delivery
SNMP messages are encapsulated in UDP datagrams. The UDP layer
does not guarantee delivery. When Annex Manager transmits a
get
,
set
,
or
get-next
command, the agent is expected to respond with an error
message or with the requested data. Annex Manager uses a timeout and
retry mechanism to guarantee the delivery of the SNMP. If a timeout
occurs, Annex Manager does not know whether the command was not
received by the agent, or whether the response from the agent was lost.
The agent can also generate an unsolicited trap command and send it to
one or more network addresses. Receivers of traps do not respond to the
SNMP agent. For detailed information, please refer to Trap Hosts and
Traps later in this chapter.
The Annex supports only the cold-start, link-up, and link-down traps
defined in MIB-II and the
suspectAttack
,
acpdbmerror
,
modemError
,
callBegin
,
callEnd
,
unexpectDisconnect
, and
nodeUnreachable
traps
defined in the
xylo-trpdef.mib
.
Содержание Manager
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Страница 22: ...am book pref xxviii Tue May 6 13 24 47 1997 Annex Manager User Guide Preface xxviii ...
Страница 118: ...am book ch5 10 Tue May 6 13 24 47 1997 Annex Manager User Guide Chapter 5 Setup Mode Basics 5 10 Part 2 Setup Mode ...
Страница 168: ...am book ch10 4 Tue May 6 13 24 47 1997 Annex Manager User Guide Chapter 10 Setting SNMP Traps 10 4 Part 2 Setup Mode ...