Cpu Interface Filtering; Cpu Interface Filtering Profile Table - D-Link xStack DES-3800 Series User Manual

xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch

CPU Interface Filtering

Due to a chipset limitation and the need for extra switch security, the xStack DES-3800 switch series 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 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 Profile Table

Click ACL > CPU Interface Filtering > CPU Interface Filtering Table to display the CPU Access Profile Table entries created
on the Switch. To view the configurations for an entry, click the hyperlinked Profile ID number.
Figure 10- 15. CPU Interface Filtering Table
The user may globally enable or disable the CPU Interface Filtering function by using the pull down menu in the State field.
Disabling the CPU Interface Filtering function will not alter or destroy any configurations; it will only disable the function.
To add an entry to the CPU Interface Filtering Profile Table, click the Add button. This will open the CPU Interface Filtering
Profile Configuration page, as shown below. There are three CPU 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 CPU 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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