%% You should probably cite rfc6757 instead of this I-D.
@techreport{ietf-netext-access-network-option-13,
    number =    {draft-ietf-netext-access-network-option-13},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-netext-access-network-option/13/},
    author =    {Sri Gundavelli and Jouni Korhonen and Mark Grayson and Kent Leung and Rajesh Pazhyannur},
    title =     {{Access Network Identifier (ANI) Option for Proxy Mobile IPv6}},
    pagetotal = 19,
    year =      2012,
    month =     aug,
    day =       8,
    abstract =  {The local mobility anchor in a Proxy Mobile IPv6 (PMIPv6) domain is able to provide access-network- and access-operator-specific handling or policing of the mobile node traffic using information about the access network to which the mobile node is attached. This specification defines a mechanism and a related mobility option for carrying the access network identifier and the access operator identification information from the mobile access gateway to the local mobility anchor over Proxy Mobile IPv6. {[}STANDARDS-TRACK{]}},
}