Point-to-Point Protocol over Ethernet (PPPoE), Point-to-Point Protocol over ATM (PPPoA), and routed bridge encapsulation (RBE) access methods are good encapsulation candidates to offer IPv6 connectivity in a variety of access service ISP designs. Those methods can leverage the IPv6 extensions to the AAA function. Offering IPv6 on top of Ethernet (or an Ethernet-like technology such as Wi-Fi) without PPP is certainly a model that will be explored by many ISPs in the near future.
This section focuses on DSL-based accesses: PPPoA, PPPoE, and RBE.
http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_data_sheet09186a008011b68d.html
