# Configuring Detection of Duplicate IPv6 Prefixes in the AAA User Profile Database

You can enable detection of duplicates of IPv6 Neighbor Discovery router advertisement prefixes and DHCPv6 delegated prefixes in the AAA user profile database.

To enable enhanced detection of duplicate IPv6 prefixes:

- From Global Configuration mode, enable the enhanced duplicate IPv6 prefix-checking capability.
  host1(config)#aaa duplicate-prefix-check-extension enable

#### Related Documentation

- Duplicate IPv6 Prefix Detection in the AAA User Profile Database Overview
- Monitoring Duplicate IPv6 Prefixes in the AAA User Profile Database
- aaa duplicate-prefix-check-extension