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CCNP Practical Studies: Troubleshooting by Donna L. Harrington

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Frame Relay Addressing

Frame Relay Layer 2 addresses are DLCIs. I mentioned previously that the WAN DLCIs are analgous to the LAN MACs. ARP is the method I discussed for mapping IP to MAC in the LAN chapters and RARP is just the opposite of mapping MAC to IP. Frame uses Inverse ARP. Routers learn remote IP addresses to map to local DLCIs via Inverse ARP or static map statements as illustrated in Figure 8-9. Use the picture and steps covered in the next section to assist you with troubleshooting Frame Relay Inverse ARP issues.

Figure 8-9. Inverse ARP

Inverse ARP

As you have witnessed in the debug lmi commands, about once a ...

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