Possible causes for a failure to learn ND entries

In V100R002 and later versions, a switch fails to learn ND entries due to the following possible causes:
- The physical state or protocol state of the interface is Down. You can run the display ipv6 interface interface-type interface-number command in any view to check the physical state and protocol state of an interface.
- The STP state of the interface is Discarding. You can run the display stp brief command in any view to check the STP state of an interface.
- The number of ND entries or IPv6 routes exceeds the limit.
- You can run the display ipv6 neighbors command in any view to check information about ND entries.
- You can run the display ipv6 routing-table statistics command in any view to check statistics on IPv6 routes.

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