Chapter 22 SNMP
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through which network administrators perform network management functions. It
executes applications that control and monitor managed devices.
The managed devices contain object variables/managed objects that define each
piece of information to be collected about a device. Examples of variables include
such as number of packets received, node port status etc. A Management
Information Base (MIB) is a collection of managed objects. SNMP allows a
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:
22.1.1
Supported MIBs
MIBs let administrators collect statistics and monitor status and performance. The
ZyXEL Device supports the following MIBs:
•
ADSL mib
•
AT mib
•
ATM mib
•
ICMP mib
•
IP mib
•
SNMP mib
•
SYSOR mib
•
TCP mib
•
UDP mib
The ZyXEL Device uses these MIBs to provide read-only information. You cannot
use SNMP to configure the ZyXEL Device.
Table 65
SNMP Commands
COMMAND
DESCRIPTION
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.
Trap
Used by the agent to inform the manager of some events.