Frame Relay is the major WAN connection in CCIE lab. Luckily, Cisco removed ATM, on which I failed my last attempt.
Some things to be careful when using Frame Relay. First of all, Inverse-ARP. It is good to disable frame relay inverse-arp after you configure the frame-relay encapsulation, and before you enable the interface. If the interface is enabled before you configure the encapsulation type, reboot the router after disabling inverse-arp.
Second thing to take care is the interface type. Be aware of the issue when one side of the link is point-to-point, and the other side is multipoint. When enabling triggered RIP, it works only under point-to-point link.
Last thing to mention is PPP over Frame Relay. We configure a virtual interface, configure the ip address under the virtual interface, and tie it to the dlci. We can configure PPP authentication under the virtual interface as well.
Some useful commands for frame relay:
sh frame pvc
sh frame map
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