This object indicates the state of the Hello protocol
exchange over this link.
The 'down' state is the initial state of the OSCP Hello
finite state machine. This state is also reached when
lower-level protocols declare that the wavelength is not
usable. No hello packets are sent or received in this
state.
The 'attempt' state indicates that either no hellos or
hellos with mismatch information have recently been
received from the remote switch. In this state, attempts
are made to contact the remote switch by periodically
sending hellos with period coscpHelloInterval.
The 'oneWay' state indicates that Hellos have recently
been received from the remote switch, but the remote
switch identifier and the remote port identifier in the
remote switch's hello packets were set to zero. This means
that the remote switch does not know the identity of this
switch.
The 'twoWay' state indicates that hellos have recently
been received from the remote switch including the
correct remote switch identifier and remote port
identifier fields. This means that bi-directional
communication with the remote switch over the message
channel on this wavelength has been achieved. The link is
now capable of becoming the active OSC for a wavelength
bundle.
A link that is not in the 'twoWay' state is not capable of
becoming the active OSC for a wavelength bundle.