ZyXEL Communications GS-3012 - Manual (Page 120)

Dimension GS-3012 Gigabit Ethernet Switch
17-2 Access Control
Table 17-1 Access Control Summary
Console port Telnet FTP Web SNMP
Number of
concurrent
sessions
allowed 1 console port or Telnet.
Console port has priority. 1 5 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
GS-3012 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 GS-3012). 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: