D-Link DGS-3427 User Manual page 60

IP packets may also be limited by the Switch by configuring only certain IP addresses to be accepted. This method can be
accomplished through the CPU Interface Filtering mechanism explained in the previous section. Once the user configures
these acceptable IP addresses, other packets containing different IP addresses will be dropped by the Switch, thus limiting
the bandwidth of IP packets. To keep the process moving fast, be sure not to add many conditions on which to accept these
acceptable IP addresses and their packets, this limiting the CPU utilization.
Once in Exhausted mode, the packet flow will decrease by half of the level that caused the Switch to enter Exhausted
mode. After the packet flow has stabilized, the rate will initially increase by 25% and then return to a normal packet flow.
NOTICE: When Safeguard Engine is enabled, the Switch will allot bandwidth to various
traffic flows (ARP, IP) using the FFP (Fast Filter Processor) metering table to control the
CPU utilization and limit traffic. This may limit the speed of routing traffic over the network.
Safeguard Engine Status
To view the current Safeguard Engine Status for the Switch, click Administration > Safeguard Engine > Safeguard
Engine Status
The Safeguard Engine Status window is a read-only field that will state the current Safeguard Engine mode of the Switch.
This field may read "normal mode" or "exhausted mode".
Enable/Disable Safeguard Engine
To enable Safeguard Engine or configure advanced Safeguard Engine settings for the Switch, click Configuration >
Safeguard Engine > Safeguard Engine Settings, which will open the following window.
To enable the Safeguard Engine option, select Enabled with the drop-down State menu and click the Apply button.
xStack DGS-3400 Series Fast Ethernet Switch
Figure 6- 19. Safeguard Engine Status display
Figure 6- 20. Safeguard Engine State menu
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