# Monitoring Duplicate IPv6 Prefixes in the AAA User Profile Database

#### Purpose

Display whether the ability to detect duplicates of IPv6 Neighbor Discovery router advertisement prefixes and DHCPv6 delegated prefixes, in the AAA userProfile database, is enabled.

#### Action

To check whether enhanced duplicate IPv6 prefix detection capability is enabled:

    host1#show aaa duplicate-prefix-check-extension
    enabled

#### Related Documentation

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