port function for this backup port pair. Setting this object
to active(2) will disable the secondary port and enable the
primary port.
When the backup port pair is activated, the backup status of
this port pair is reflected as stand-by(3) or backup(4).
Value stand-by(3) indicates that the primary port is okay
and enabled. Value backup(4) means that the primary port has
failed and the secondary port has taken over. After the
secondary port has taken over, setting this object to
active(2) will attempt to recover the primary port and
disable the secondary port. Success here depends on the
ability to establish a good link on the primary port.
The values stand-by(3) and backup(4) are read-only.
Attempting to set this object to either of these two values
is not valid. The result 'snmpBadValue' will be returned.