ZyXEL Communications ZyXEL Dimension ES-3124 - Manual (Page 134)

Dimension ES-3124 Ethernet Switch
17-2 Access Control
Table 17-1 Access Control Overview
Console port SSH Telnet FTP Web SNMP
The console port, SSH and Telnet share one
session. The console port has the highest
priority and Telnet has the lowest priority. One session Up to five
accounts No limit
17.3 About SNMP
Simple Network Management Protocol is a protocol used for exchanging management information between
network switches. SNMP is a member of TCP/IP protocol suite. A manager station can manage and monitor the
ES-3124 through the network via SNMP version one (SNMPv1) and/or SNMP version 2c. The next figure
illustrates an SNMP management operation. SNMP is only available if TCP/IP is configured.
Figure 17-3 SNMP Management Model
An SNMP managed network consists of two main components: agents and a manager.
An agent is a management software module that resides in a managed switch (the ES-3124). An agent translates the
local management information from the managed switch into a form compatible with SNMP. The manager is the
console 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 switch. 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: