D-Link xStack DGS-3426P, User Manual

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xStack DGS-3400 Series Layer 2 Gigabit Ethernet Managed Switch
CPU Interface Filtering
Due to a chipset limitation and needed extra switch security, the xStack DGS-3400 Series switch incorporates CPU Interface
filtering. This added feature increases the running security of the Switch by enabling the user to create a list of access rules for
packets destined for the Switch’s CPU interface. Employed similarly to the Access Profile feature previously mentioned, CPU
interface filtering examines Ethernet, IP and Packet Content Mask packet headers destined for the CPU and will either forward
them or filter them, based on the user’s implementation. As an added feature for the CPU Filtering, the xStack DGS-3400 Series
switch allows the CPU filtering mechanism to be enabled or disabled globally, permitting the user to create various lists of rules
without immediately enabling them.
Creating an access profile for the CPU is divided into two basic parts. The first is to specify which part or parts of a frame the
Switch will examine, such as the MAC source address or the IP destination address. The second part is entering the criteria the
Switch will use to determine what to do with the frame. The entire process is described below.
CPU Interface Filtering State Settings
In the following window, the user may globally enable or disable the CPU Interface Filtering mechanism by using the pull-down
menu to change the running state. To access this window, click
ACL > CPU Interface Filtering > CPU Interface Filtering
State . Choose Enabled to enable CPU packets to be scrutinized by the Switch and Disabled to disallow this scrutiny.
Figure 8- 18. CPU Interface Filtering State Settings window
CPU Interface Filtering Table
The CPU Interface Filtering Table displays the CPU Access Profile Table entries created on the Switch. To view the
configurations for an entry, click the hyperlinked Profile ID number.
Figure 8- 19. CPU Interface Filtering Table
To add an entry to the CPU Interface Filtering Table , click the Add Profile button. This will open the CPU Interface Filtering
Configuration page, as shown below. To remove all CPU Interface Filtering Table entries, click the Clear All button. There are
three Access Profile Configuration pages; one for Ethernet (or MAC address-based) profile configuration, one for IP address-
based profile configuration and one for the Packet Content Mask . You can switch between the three Access Profile
Configuration pages by using the Type drop-down menu. The page shown below is the Ethernet CPU Interface Filtering
Configuration page.
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