Configuration restrictions and guidelines
The configured FR fragmentation function takes effect after you associate the FR PVCs requiring FR fragmentation with the FR class and enable FRTS on the FR PVCs.
MFR interfaces do not support FRF.12 fragmentation. If the interfaces at both ends of a link are MFR interfaces with FRF.12 fragmentation enabled, FRF.12 fragmentation does not take effect. Packets are sent out of the local end without being fragmented and can be received by the remote end. When pinging the remote end on the local end, you can get response from the remote end. If the local MFR interface is connected to a normal FR interface (that is, a serial interface encapsulated with FR), FRF.12 fragmentation does not work at the local end and packets are sent out of the local end without being fragmented, however, FRF.12 fragmentation takes effect on the remote end.