
Industrial Managed
Ethernet Switch
User Manual
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Figure 2.74 Black
-
List MAC Setting Webpage
Table 2.21 Descriptions of MAC Filtering Webpage
Label
Description
Source MAC Address
Enter MAC address to be black
-
listed or filtered manually
.
Remove
Remove
the corresponding entry in MAC filtering table
.
Add
Add
a MAC addresses to the MAC filtering table
2.8.3
MAC Aging Time
This function allows users to set MAC address age
-
out or aging time manually as shown in Figure 2.75
First, to
enable
MAC Address Age-out
, check the
Enabled
box. Then the users can specify the
Age
-
out Time
between
100 and 765 seconds in the following field
.
Note that the default value of age
-
out timeis 300seconds
.
In the managed
switch, a MAC address table is stored in the memory to map a MAC address and a port number to forward frames
.
The aging time is the duration of time to keep MAC addresses in the MAC addresstable
.
For a longer aging time,
the learned MAC address will stay in the memory longer
.
As a result, the switch will be able to forward the frames
to a specific port quickly instead of forwarding to all the ports to prevent frame flooding
.
A shorter aging time will
allow the switch to free up the old MAC addresses in the table to learn new MAC addresses
.
This will be useful
when there are large number of MAC addresses
)
or end devices
(
in the network and when the traffic between any
two end devices are short
-
lived
.
Figure 2.75 MAC Aging Time Webpage