Some converter ports that are capable of autonegotiation
(ANEG) may sometimes be between two end ports that would like
to autonegotiate with each other. The Agent can ensure
that both ports in the converter/circuit settle on the same
autonegotiated settings. This feature is called LinkMatch.
ANEG with LinkMatch can sometimes be a lengthy process.
In order to streamline the ANEG process, users may manually
configure the parameters that supporting ports will advertise
during their independent autonegotiations. This involves two
steps - first to change the nbsCmmcPortAutoNegAd object to
reflect the outcome desired, then to set this
nbsCmmcPortLinkMatch object to the value disabled(2).
The default value for this object is enabled(3).
Ports that do not support this feature should return the
value notSupported(1).