This object describes the role that the link
station has assumed on this connection.
Even though this is defined as a port object,
it is a link station attribute in the sense
that a role is per link station. However, it
is not possible to vary link station roles on a
particular port. For example, if an SDLC port
is configured to primary, all link stations on
that port must be primary.
The value of sdlcPortOperRole is undefined(3)
whenever the link station role has not yet been
established by the mode setting command.