This specifies whether 'ccoa-only' state is
enabled or not on this mobile router interface.
When this variable is set to true,
mobile router will attempt to register directly
using a CCoA and will not attempt foreign agent
registrations even if foreign agent advertisements
are heard on this interface. When set to false,
the mobile router will attempt to register via a
foreign agent whenever foreign agent advertisements
are heard. When foreign agent advertisements are
not heard, then the interface will attempt CCoA
registration.