The cause of current operational state of the
port.
The current operational state of the port is shown by
the 'ifOperStatus' defined in IF-MIB. This object
will show 'none(2)' for all the 'ifOperStatus' values
except for 'down(2)'. It will show one of the values
from the 'FcIfOperStatusReason' textual convention
if 'ifOperStatus' is 'down(2)'. It will show other(1)
if the operational status cause is not from one
defined in 'FcIfOperStatusReason'.
This object will also be an additional varbind sent
in the linkDown notification ( defined in IF-MIB ) in
addition to the varbinds defined for this notification.