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IES-1000 User’s Guide
12-2 Remote Management
An agent is a management software module that resides in a managed device (the IES-1000). An agent translates
the local management information from the managed device into a form compatible with SNMP. The manager is
the station through which network administrators perform network management functions. It executes operations
that control and monitor the managed devices.
The managed devices contain objects that define each piece of information to be collected about a device.
Examples of variables include the number of packets received, node port status, etc. A Management Information
Base (MIB) is a collection of managed objects. SNMP allows manager and agents to communicate for the purpose
of accessing these objects.
SNMP itself is a simple request/response protocol based on the manager/agent model. The manager issues a request
and the agent returns responses using the following protocol operations:
♦ Get
Allows the manager to retrieve an object variable from the agent.
♦ GetNext
Allows the manager to retrieve the next object variable from a table or list within an agent. In SNMPv1, when a
manager wants to retrieve all elements of a table from an agent, it initiates a Get operation, followed by a series
of GetNext operations.
♦ Set
Allows the manager to set values for object variables within an agent.
♦ Trap
Used by the agent to inform the manager of some events.
12.2.1 Supported MIBs
The network module supports MIB II that is defined in RFC 1213 and RFC 1215 as well as transparent bridge
MIBs defined in RFC 1493. The network module can also respond with specific data from the ZyXEL private MIB
(ZYXEL-MIB).
12.3 SNMP Access Configuration
To control access to the agent in the network module, use the access commands in the SNMP subsystem. Note
that “community” is SNMP’s terminology for password. After configuring the SNMP access parameters, save the
configuration to the nonvolatile memory with the
config save
command. The default write community string is
“1234”, and the default read community string is “public”.
12.3.1 SNMP Access Read/Write Command
Syntax:
access <read | write> <community> [<IP addr>]
where
<read | write> = Specifies read-only/read-write
permission.
<community> = Password needed to access the SNMP agent
on the network module.
[<IP addr>] = Optional IP address of the allowed SNMP
manager.