# IPv6 DHCPv6 Prefix Delegation **URL:** https://forum.networklessons.com/t/ipv6-dhcpv6-prefix-delegation/2993 **Category:** Lessons Discussion **Created:** [February 20, 2018, 11:59am UTC](https://forum.networklessons.com/t/ipv6-dhcpv6-prefix-delegation/2993 "2018-02-20T11:59:30Z") **Posts on this page:** 1 **Showing post:** 3
### Author: ![lagapidis](https://cdn-forum.networklessons.com/user_avatar/forum.networklessons.com/lagapidis/32/4949_2.png) [@lagapidis](https://forum.networklessons.com/u/lagapidis) #### Post date: [May 1, 2018, 6:53am UTC](https://forum.networklessons.com/t/ipv6-dhcpv6-prefix-delegation/2993/3 "2018-05-01T06:53:21Z")
Hello Djan These acronyms display several attributes of the IPv6 address, and are always displayed after the address itself. These are part of the output of the `show ipv6 interface` command. Specifically, the [EUI/CAL/PRE] acronyms you mention are indicating that: EUI - Extended Unique Identifier. The address was generated using EUI-64, a method by which the IPv6 address is derived from the MAC address of the interface. CAL - Calendar. This means that the address is timed and has valid and preferred lifetimes. PRE - Preferred. This timed address is preferred. There are several other attributes as well and you can find them at this Cisco Command Reference link for the `show ipv6 interface` command. > **[cisco-5700-series-wireless-lan-controllers](https://www.cisco.com/c/en/us/obsolete/wireless/cisco-5700-series-wireless-lan-controllers.html)** > > cisco-5700-series-wireless-lan-controllers I hope this has been helpful! Laz --- _[View the full topic](https://forum.networklessons.com/t/ipv6-dhcpv6-prefix-delegation/2993)._