xStack
®
DES-3500 Series Layer 2 Stackable Fast Ethernet Managed Switch User Manual
112
CPU Interface Filtering
Due to a chipset limitation and the need for extra switch security, the xStack
®
DES-3500 Series switches incorporate 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 Configuration > ACL > CPU Interface Filtering 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 6- 87. CPU Interface Filtering window
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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