This object is used to disable redundancy on certain cards
that support the 802.3ah standard, but if supported, the
preferred method is to use the object nbsCmmcPortEnableAdmin
to administratively disable redundant ports that shouldn't
become active.
This object may also be used to change the operating mode of
4 port crossbar cards that can be configured for redundancy.
For cards that do not support this feature, any reads of
this object should get the response notSupported (1). Writes
to this object should be rejected with the SNMP error
badValue (3).