Why does the USG OSPF not be able to import multiple routes with the same mask for the same network address?

In the USG, you can not import multiple routes with the same mask as the same mask.
Because products based on the VRP3.0 platform do not support the features defined in RFC2328 Appendix E. VRP3.0 uses the network address as the LS. When multiple routes with the same network address need to be imported, only the first route can be imported, and the rest is duplicated.

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