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8. IEEE 802.1x Port Security Function
If the 802.1x function is enabled, the switch will act as an authenticator for
users accessing network through the switch. It will need a RADIUS server for
the authentication function. Users will be asked for username and password
before network access. If the RADIUS server authenticates it, the switch will
enable the port for network access. This function is very useful for network
security application to prevent illegal users access network through the switch.
9. Rate Control
This function can limit the traffic rate for physical ports. The traffic could be
ingress traffic or egress traffic. This function can limit the network bandwidth
utilization of users.
10. Private VLAN
Three kinds of VLAN are defined for this application – Primary VLAN,
Community VLAN, and Isolated VLAN. Community VLAN and Isolated VLAN
can communicate with Primary VLAN, but they cannot communicate with each
other. And users in Isolated VLAN cannot communicate with each other. This
is a special VLAN configuration. This switch supports a dedicated configure
interface for such application.
11. IP Multicast with IGMP Snooping
IP multicast function can forward packets to a group of users connected on
different ports. The user group is learned by the switch from packets of IGMP
active router with IGMP snooping function. It is often used for video
applications
12. MVR (Multicast VLAN Registration)
VLAN function will isolate traffic between VLAN groups. But it will also isolate
IP multicast traffic for subscribers in different VLANs. The MVR function allows
one multicast VLAN to be shared by subscribers in different VLANs. That can
reduce the multicast traffic for VLANs.
13. DHCP Relay & DHCP Option 82
DHCP Relay function will control DHCP requests and forward DHCP requests
to the assigned DHCP server. DHCP Option 82 function will add port and
switch information to DHCP requests and then send to the assigned DHCP
server. Based on those information, DHCP server will assign an IP
configuration in the DHCP reply. This is a security function.
14. IP Filtering
This function can limit the IP address and the subnet for accessing network
from switch port. That can prevent illegal IP problem in network.
15. Software Backup/Update
This switch supports backup and update functions for its internal software and
its network configuration. It could be done in two ways.
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