Configuration restrictions and guidelines
To make FRF.9 compression take effect, enable it on both ends.
The fr compression frf9 command is applicable to only P2P subinterfaces with IETF frame relay enabled. Before configuring the fr compression frf9 command on a subinterface, configure a DLCI on it first.
After enabling or disabling FRF.9 compression on a subinterface, re-enable the subinterface using the shutdown command and then the undo shutdown command to make the configuration take effect.
FRF.9 compression requires a synchronization procedure. If packets are out of order when being compressed, the compression is prone to failure.