What is the command to show IPv6 ND information?

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display ipv6 neighbors.

Other related questions:
What commands can be used to view the IPv6 property of the Tunnel interface
View the Tunnel interface ipv6 property command is : display IPv6 interface tunnel interface-number

How do I view the NAT session table on the AR router
Run the display nat session all command to check NAT session table information.

Command used to check IPv6 attributes of the tunnel interface
The display ipv6 interface tunnel interface-number command is used to check IPv6 attributes of the tunnel interface.

Check address allocation on S series switch
On S series switches except S1700 switches, you can view information about IP addresses in an address pool as follows: - If an interface address pool is used, run the display ip pool [ interface interface-pool-name [ start-ip-address [ end-ip-address ] | all | conflict | expired | used ] ] command. - If a global address pool is used, run the display ip pool [ name ip-pool-name [ start-ip-address [ end-ip-address ] | all | conflict | expired | used ] ] command. You can configure fields in the command as required: - To view information about all IP addresses in an address pool, specify all. - To view information about conflicting IP addresses in an address pool, specify conflict. - To view information about expired and idle IP addresses in an address pool, specify expired. - To view information about used IP addresses in an address pool, specify used. - To view information about a specific IP address or an IP address range in an address pool, specify start-ip-address [ end-ip-address ].

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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