# Configuring Duplicate IPv6 Prefix Check

You can enable detection of duplicates of IPv6 Neighbor Discovery router advertisement prefixes and DHCPv6 delegated prefixes.

To enable detection of duplicate IPv6 prefixes:

- From Global Configuration mode, enable the prefix-checking capability.
  host1(config)#aaa duplicate-prefix-check enable

#### Related Documentation

- aaa duplicate-prefix-check
- Duplicate IPv6 Prefix Check Overview