AES-100 User’s Guide

An agent is a management software module that resides in a managed device (the AES-100). 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 frames 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.

11.2.1 Supported MIBs

The ADSL Networking Module supports MIB II that is defined in RFC 1213 and RFC 1215 as well as transparent bridge MIBs defined in RFC 1493. The ADSL Networking Module can also respond with specific data from the ZyXEL private MIB (ZYXEL-MIB).

11.3SNMP Access Configuration

To control access to the agent in the ADSL Networking 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”.

11.3.1 SNMP Access Read/Write Command

Syntax:

192.168.1.1 snmp> 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 ADSL Networking Module.

[<IP addr>] = Optional IP address of the allowed SNMP manager.

11-2

Remote Management