8 Port SNMP Managed Switch – User Manual
Page
32
Product Number 0-15910xx-x
© Tyco Electronics 2004
PL0357 Issue A
MAC Aging Time Setting
This setting specifies the time that a dynamic MAC address can remain in the switch tables
before the value is “aged out”. The valid range is 300 to 765 seconds. The default value is 300
seconds, which is the industry standard duration. This value rarely needs to be modified.
Broadcast Storm Filtering
This is used to limit the number of packets flowing through the switch that do not have
associated entries in the switch tables (Destination Look-Up Failures) or excessive boardcast
transmissions. In some instances, this high level of DLF/broadcast traffic can degrade network
performance. To minimize this problem, the switch can be programmed to limit the amount of
broadcast traffic that can flow through the switch. In normal networks, only a few percent of
traffic would normally be broadcasts.
This mode is accessed from the Misc. Configuration screen and is changed by selecting <
Edit
>
from the action line and the cursor then moves to move to the Broadcast Storm field. Use the
<
Space
> key to step through the available values:-
•
No
•
5%
•
10%
•
15%
•
20%
•
25%
The default value is
No
but for normal networks, a selected value of
5%
would serve to limit the
number of excessive broadcasts and yet allow normal levels of broadcasts to flow. After the
required limit value has been selected, use the <
Esc
> key to move to the action line and then
select <
Save
> to store the value.
