Why the FR link protocol cannot go up

The possible cause is that the interface configurations on the two ends are incorrect, including:

-The interface types must be DTE on one end and DCE on the other end.
-The DLCI is not configured on the interface or the DLCI range setting is incorrect. The DLCI ranges from 16 to 1022.
-The FR Local Management Interface (LMI) protocol types are different.
-The FR encapsulation formats configured on the two ends are different. When the FR protocol is used as the encapsulation protocol, the default frame encapsulation format is IETF.
-If the E1/T1 board is used, the interface TSs on the two ends do not completely match.

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