DHCPv6 options Delegate IPv6 prefix from provider to this interface Interface address identifier 0- Used to form IPv6 interface address (default: EUI-64) Interface site-Level aggregator (SLA) 0-128 Decimal integer which fits in the length of SLA IDs Site-Level aggregator (SLA) length 0-128 Length of delegated prefix Acquire only config parameters, no address IPv6 "temporary" address