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DES-3810 Series Layer 3 Managed Ethernet Switch Web UI Reference Guide
356
at 5-second intervals. (First stop = 5 seconds, second stop = 10 seconds, third stop = 20 seconds) Once the flooding
is no longer detected, the wait period for dropping ARP and IP broadcast packets will return to 5 seconds and the
process will resume.
In
Fuzzy
mode, once the Safeguard Engine has entered the Exhausted mode, the Safeguard Engine will decrease the
packet flow by half. After returning to Normal mode, the packet flow will be increased by 25%. The switch will then
return to its interval checking and dynamically adjust the packet flow to avoid overload of the Switch.
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.
Users can enable the Safeguard Engine or configure advanced Safeguard Engine settings for the Switch.
To view the following window, click
Security > Safeguard Engine Settings
, as shown below:
Figure 9-87 Safeguard Engine Settings window
The fields that can be configured are described below:
Parameter
Description
Safeguard Engine State
Use the radio button to globally enable or disable Safeguard Engine settings for the
Switch.
Rising Threshold (20%
- 100%)
Used to configure the acceptable level of CPU utilization before the Safeguard Engine
mechanism is enabled. Once the CPU utilization reaches this percentage level, the
Switch will move into Exhausted mode, based on the parameters provided in this window.
Falling Threshold (20%
- 100%)
Used to configure the acceptable level of CPU utilization as a percentage, where the
Switch leaves the Safeguard Engine state and returns to normal mode.
Trap / Log
Use the pull-down menu to enable or disable the sending of messages to the device’s
SNMP agent and switch log once the Safeguard Engine has been activated by a high
CPU utilization rate.
Mode
Used to select the type of Safeguard Engine to be activated by the Switch when the CPU
utilization reaches a high rate. The user may select:
Fuzzy
– If selected, this function will instruct the Switch to minimize the IP and ARP traffic
flow to the CPU by dynamically allotting an even bandwidth to all traffic flows.
Strict
– If selected, this function will stop accepting all ARP packets not intended for the
Switch, and will stop receiving all unnecessary broadcast IP packets, until the storm has
subsided.
The default setting is
Fuzzy
mode.
Click the
Apply
button to accept the changes made.
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