D-Link DXS-3400 User Manual - Page 338

DXS-3400 Series Lite Layer 3 Stackable 10GbE Managed Switch Web UI Reference Guide To view the following window, click Security >TACACS+>TACACS+ Statistic, as shown below: Figure 9-38TACACS+ Statistic Window The fields that can be configured are described below: Parameter Group Server Name Description Select the TACACS+ group server name from this list here. Click the first Clearbutton to clear the information based on the group selected. Click the Clear All button to clear all the information in this table. Click the secondClear button to clear all the information for the specific entry. IMPB The IP network layer uses a four-byte address. The Ethernet link-layer uses a six-byte MAC address. Binding these two address types together allows the transmission of data between the layers. The primary purpose of IP-MAC-Port Binding (IMPB) is to restrict the access to a Switch to a number of authorized users. Authorized clients can access a Switch's port by either checking the pair of IP-MAC addresses with the pre-configured database or if DHCP snooping has been enabled in which case the Switch will automatically learn the IP/MAC pairs by snooping DHCP packets and saving them to the IMPB white list. If an unauthorized user tries to access an IP-MAC binding enabled port, the system will block the access by dropping its packet. Active and inactive entries use the same database. The function is port-based, meaning a user can enable or disable the function on the individual port. IPv4 DHCPv4 Snooping DHCP Snooping Global Settings This window is used to display and configure the DHCP snooping global settings. To view the following window, click Security > IMPB > IPv4 > DHCPv4 Snooping >DHCP Snooping Global Settings, as shown below: Figure 9-39DHCP Snooping Global Settings Window The fields that can be configured are described below: 328