The Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) connects IPv6 hosts/routers over IPv4 networks via automatic tunneling using a link abstraction similar to the Non-Broadcast, Multiple Access (NBMA) model. This document describes operational extensions for ISATAP that enable a dynamic tunnel endpoint management abstraction similar to the ATM Permanent/Switched Virtual Circuit model. Nodes can use these extensions to realize mobility, multihoming and efficiency improvements.