Operation Manual – 802.1x-System Guard
H3C S3100 Series Ethernet Switches Chapter 4 System-Guard Configuration (For S3100-EI)
4-1
Chapter 4 System-Guard Configuration (For
S3100-EI)
 Note:
The configuration introduced in this chapter is only supported by the S3100-EI series
switches.
4.1 System-Guard Overview
At first, you must determine whether the CPU is under attack to implement system
guard for the CPU.
You should not determine whether the CPU is under attack just according to whether
congestion occurs in a queue. Instead, you must do that in the following ways:
z According to the number of packets processed in the CPU in a time range.
z Or according to the time for one hundred packets to be processed.
If the CPU is under attack, the rate of packets to be processed in the CPU in a certain
queue will exceed the threshold value. In this case, you can determine that the CPU is
under attack. Through analyzing these packets , you get to know the characteristics of
the attack source, and then you can adopt different filtering rules according the
characteristics of the attack source. Thus, system guard is implemented.
4.2 Configuring the System-Guard Feature
Through the following configuration, you can enable the system-guard feature, set the
threshold for the number of packets when an attack is detected and the length of the
isolation after an attack is detected.
4.2.1 Configuring the System-Guard Feature
Table 4-1 Configure the system-guard feature
Operation Command Description
Enter system view
system-view
—
Enable the system-guard
feature
system-guard enable
Required
By default, the system-guard
feature is disabled.
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