Why can IS-IS neighbors not be established

This has the following possible causes:

-Point-to-multipoint (P2MP) interfaces do not support the Intermediate System to Intermediate System routing protocol (IS-IS).
-The MTU of the Ethernet Interface is smaller than the max-size of IS-IS LSP packets plus 3.
-The MTU of the point-to-point (P2P) interface is less than the length of the IS-IS LSP packet.
-The two ends have different parameter configurations.

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