SNMP Configuration and Management Manual

Installing and Configuring the SNMP Agent
SNMP Configuration and Management Manual—424777-006
2-3
Initialization Tasks
Initialization Tasks
Before you begin to configure the SNMP agent you should understand what the SNMP
agent does when it is started to give you an idea of the state of the SNMP agent in
which you’ll be configuring. When you start the SNMP agent, it performs these
initialization tasks:
•
Ensures that the SNMP agent is running as a named process. If you did not
specify a name, TACL assigns one.
•
Ensures that the SNMP agent is running with super user group access privileges, if
the PORT startup parameter is port 161 (the standard SNMP port for receiving
manager requests) or a port number less than 1023. If the port number is greater
than 1023, the SNMP agent generates an EMS event stating that the SNMP agent
must run under a super group creator accessor ID and stops running. Refer to the
description of the PORT startup parameter (page 2-10) for more information on this
topic.
•
Opens any TCP/IP subnets configured for communications with SNMP managers.
If no TCP/IP subnets are available, the agent process starts but generates socket-
error and state-change EMS event messages.
•
Starts a backup process if you requested one.
•
Processes configuration information. Creates a trap destination definition (if none
already exists) for the Internet address associated with any manager from which
the SNMP agent receives a request through TCP/IP.
The Default SNMP Agent
When started without any customization, the SNMP agent:
•
Receives and sends SNMP messages through NonStop Kernel IPC calls or
through any available subnet associated with the TCP/IP process $ZTC0 on the
local node.
•
Accepts any request received through TCP/IP that contains the community name
“public” and gives the “public” community READONLY access.
•
Accepts any request received through the IPC interface and grants the requesting
manager READWRITE access to all MIB objects supported by the SNMP agent
and subagents except the SNMP agent’s private zagInProfile group objects.
•
Sends traps through the TCP/IP process $ZTC0 on the local node to the Internet
address associated with each SNMP manager communicating using TCP/IP from
which a request is received. Includes the community “Tandem” in the traps.
Note. Objects in the SNMP agent’s zagInProfile group (see SNMP Agent Private MIB
Objects on page 3-31) are accessible only if the process accessor ID (PAID) of the
manager process is compatible with that of the agent process. See Authentication Table
Entries on page 3-31 for more details.