D-Link DES-3252P - Web Smart Switch, Инструкция по установке

Страница: 264 / 301

Appendix A Device Specifications & Features
Page 264
Power over Ethernet
Power over Ethernet (PoE) provide power to devices over exist-
ing LAN cabling, without updating or modifying the network infra-
structure. Power over Ethernet removes the necessity of placing
network devices next to power sources. Power over Ethernet can
be used in the following applications:
•
IP Phones
•
Wireless Access Points
•
IP Gateways
•
PDAs
•
Audio and video remote monitoring
Private VLANs
Private VLAN ports are a Layer 2 security feature which provide
isolation between ports within the same Broadcast domain.
RADIUS Clients
RADIUS is a client/server-based protocol. A RADIUS server
maintains a user database, which contains per-user authentica-
tion information, such as user name, password and accounting
information.
Rapid Spanning Tree
Spanning Tree can take 30-60 seconds for each host to decide
whether its ports are actively forwarding traffic. Rapid Spanning
Tree (RSTP) detects uses of network topologies to enable faster
convergence, without creating forwarding loops.
Remote Monitoring
Remote Monitoring (RMON) is an extension to SNMP, which pro-
vides comprehensive network traffic monitoring capabilities (as
opposed to SNMP which allows network device management and
monitoring). RMON is a standard MIB that defines current and
historical MAC-layer statistics and control objects, allowing real-
time information to be captured across the entire network.
Self-Learning MAC Addresses
The device enables automatic MAC address learning from incom-
ing packets. The MAC addresses are stored in the Bridging Table
SNMP Alarms and Trap Logs
The system logs events with severity codes and timestamps.
Events are sent as SNMP traps to a Trap Recipient List.
SNMP Versions 1, 2 and 3
Simple Network Management Protocol (SNMP) over the UDP/IP
protocol controls access to the system, a list of community entries
is defined, each of which consists of a community string and its
access privileges. There are 3 levels of SNMP security read-only,
read-write and super. Only a super user can access the commu-
nity table.
SNTP
The Simple Network Time Protocol (SNTP) assures accurate net-
work Ethernet Switch clock time synchronization up to the milli-
second. Time synchronization is performed by a network SNTP
server. Time sources are established by Stratums. Stratums
define the distance from the reference clock. The higher the stra-
tum (where zero is the highest), the more accurate the clock.
F e a t u r e D e s c r i p t i o n