Alternatively, a router can dynamically discover the IP address of the device on the other end of the virtual circuit. This can be done using the frame-relay interface-dlci yyyy command, where yyyy is the DLCI for that particular interface. Routers that dynamically discover the IP address of the device on the other end of the virtual circuit do so using Inverse ARP. Recall from your previous studies that the purpose of ARP is to find the MAC address of the device that holds a specific, known IP address. To be more formal, we have a known Layer 3 address that we wish to map to an unknown Layer 2 address, we use ARP in order to find the unknown Layer 2 address. As the name implies, Inverse ARP does the opposite: we have a known Layer 2 address (a DLCI) that we wish to map to an unknown Layer 3 address (an IP address).
Use the frame-relay interface-dlci interface configuration command to allow use of subinterfaces in the Frame Relay network. To remove this feature, use the no frame-relay interface-dlci command.
interface serial1 0 - dlci 101 state changed to deleted
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Use the frame-relay local-dlci interface configuration command to set the source DLCI for use when the LMI is not supported. Use the no frame-relay local-dlci command to remove the DLCI number.
Use the frame-relay multicast-dlci interface configuration command to define the DLCI to be used for multicasts. Use the no frame-relay multicast-dlci command to remove the multicast group.
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