Split Horizon on Frame-Relay

Split horizon must be take into account for DV protocols :

By default split-horizon is enabled on all cisco router interface.

Except for frame-relay interface, and particulary on mutilpoint Frame-Relay interface (ex on the Hub router). It acts differently for RIP and EIGRP

RIP : by default split-horizon is disabled on FR interface

EIGRP : Split-horizon must be manually disabled on FR interface

int s0/1
no ip split-horizon eigrp 100