ZyXEL Communications GS1920-48HPv2, Руководство пользователя

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Chapter 40 Access Control
GS1920v2 Series User’s Guide
357
The following table describes the labels in this screen.
40.7 Te c hnic a l Re fe re nc e
This section provides technical background information on the topics discussed in this chapter.
40.7.1 Ab o ut SNMP
Simple Network Management Protocol (SNMP) is an application layer protocol used to manage and
monitor TCP/IP-based devices. SNMP is used to exchange management information between the
network management system (NMS) and a network element (NE). A manager station can manage and
monitor the Switch through the network via SNMP version 1 (SNMPv1), SNMP version 2c or SNMP version
3. The next figure illustrates an SNMP management operation. SNMP is only available if TCP/IP is
configured.
Fig ure 260
SNMP Management Model
An SNMP managed network consists of two main components: agents and a manager.
Table 176 Management > Access Control > Remote Management
LABEL DESC RIPTIO N
Entry This is the client set index number. A “client set” is a group of one or more “trusted computers”
from which an administrator may use a service to manage the Switch.
Active Select this check box to activate this secured client set. Clear the check box if you wish to
temporarily disable the set without deleting it.
Start Address
End Address
Configure the IP address range of trusted computers from which you can manage this Switch.
The Switch checks if the client IP address of a computer requesting a service or protocol matches
the range set here. The Switch immediately disconnects the session if it does not match.
Telnet/FTP/
HTTP/ICMP/
SNMP/SSH/
HTTPS Select services that may be used for managing the Switch from the specified trusted computers.
Apply Click
Apply
to save your changes to the Switch’s run-time memory. The Switch loses these
changes if it is turned off or loses power, so use the
Sa ve
link on the top navigation panel to save
your changes to the non-volatile memory when you are done configuring.
Cancel Click
C a nc e l
to begin configuring this screen afresh.