# 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

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