The DHCPv6 client of the device supports the prefix exclude option for DHCPv6-based prefix delegation according to RFC 6603.
Providers use this mechanism with DHCPv6 prefix delegation in order to exclude a prefix from the delegated prefix set from being used on the customer LAN. This means that the device does not require an additional prefix for the WAN link, but instead it uses the prefix that was excluded from the delegated DHCPv6 prefix set. This prefix is no longer available for the LAN on the customer site.
If a device is configured to use the excluded prefix for the LAN, is a syslog message is issued and the prefix is not advertised on the LAN. To resolve this conflict, you configure a different subnet ID for this LAN under .
