Industrial Managed
Ethernet Switch
User Manual
Configuring
with a Web
Browser
Page
30
of
49
Figure 2.31 SYSLOG Event Drop-down Selection
2.5
Security
The
Security
function for EH3408 series lite-managed switch includes
Strom Control
and
VLAN Table
features as
shown in the menu bar in Figure 2.32. The
Security
function is the fourth circular icon on the menu bar with the lock
picture.
Figure 2.32 Security Function
2.5.1
Storm Control feature
Storm control prevents traffic on a LAN from being disrupted by
ingress traffic of broadcast, multicast, and
destination lookup failure (DLF) on a port. Figure 2.33 shows the
Strom Control
feature under the
Security
function.
On this web page, there are two sections:
Storm Control Threshold
and
Storm Control Information
. The Storm Control
Threshold indicates the current setting of the threshold (ranging from 0 to 255500 packet per second (pps)) while
the Storm Control Information summarizes the current settings for different types of traffic in each port in a table
format. The Strom Control feature in EH3408 series lite-managed switch can prevent three types of ingress traffic on
a LAN which are
DLF
(Destination Lookup Failure),
Multicast
and
Broadcast
.
Type of Storm Packets:
-
DLF
:
D
estination
L
ookup
F
ailure. The switch will always look for a destination MAC address
in its MAC Table
first. In case that a MAC address cannot be found in the MAC Table, which means DLF occurs, the switch will
forward the packets to all ports that are in the same LAN.
-
Multicast
: This type of transmission sends messages from one host to multiple hosts. Only those hosts that
belong to a specific multicast group will receive it. Network devices that support multicast send only one copy
of the information across the network until the delivery path that reaches group members diverges. At these
