Four Types of Frame-Relay Layer 3 to Layer 2 Mapping
ARP provides a mechanism to solve IP address to MAC address mapping. Likewise, Invers-ARP provides the way that Frame-Relay dynamically from layer3 to layer 2 mapping. Although it is a simplest way but it will rarely happened in the lab exam.
Mostly, we’ll use frame-realy map ip 192.168.106.6 203 broadcast command to statically mapping IP and DLCI. The broadcast keyword is useful for IGP routing protocol to send multicast packets.
For subinterface, normally we use frame interface-dlci 203 command to mapping point-to-point interface.
For the purposes of authentication, SP will ask PPP over Frame-Relay. By using PPP over Frame-Relay we now are running IP over PPP over Frame-Relay. So as far as IP is concerned there isn’t any layer 3 to layer 2 mapping needed since it’s now running over PPP. we use frame-relay interface-dlci 203 ppp vitrual-interface command.
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