Dell PowerConnect M6220 User's Guide - Page 410

IPSG Binding Configuration Summary The IPSG Binding Configuration Summary page displays the IPSG Static binding list and IPSG dynamic binding list (the static bindings configured in Binding configuration page). To access the IPSG Binding Configuration Summary page, click Switching > DHCP Snooping > IP Source Guard > IPSG Binding Configuration Summary in the navigation tree. Figure 7-122. IPSG Binding Configuration Summary The IPSG Binding Configuration Summary page contains the following fields: To remove an interface from the IPSG Binding list, select the Remove checkbox and select Apply Changes. DHCP Relay When a DHCP client and server are in the same IP subnet, they can directly connect to exchange IP address requests and replies. However, having a DHCP server on each subnet can be expensive and is often impractical. Alternatively, network infrastructure devices can be used to relay packets between a DHCP client and server on different subnets. Such a device, a Layer 3 Relay agent, is generally a router that has IP interfaces on both the client and server subnets and can route between them. However, in Layer 2 switched networks, there may be one or more infrastructure devices (for example, a switch) between the client and the L3 Relay agent/DHCP server. In this instance, some of the client device information required by the L3 Relay agent may not be visible to it. In this case, an L2 Relay agent can be used to add the information that the L3 Relay Agent and DHCP server need to perform their roles in address and configuration and assignment. 408 Configuring Switching Information