IBM 8237, Installation And User Manual

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8237 Hub Installation and Planning Guide
When you set the Action field of the backup port pair to ACTIVE, the
status field will then change from being blank to either STAND-BY or
BACKUP. STAND-BY indicates that the primary port is functioning and
enabled. BACKUP means that the primary port has failed and the
secondary port has taken over. To reset a backup pair so that the
primary port is again handling network traffic, reset the Action field to
ACTIVE.
Note: If a port has been configured for intrusion protection, that function
has priority. This means that a port configured as the secondary that has
been disabled as the result of an intrusion violation will not be available
should the primary port with which it is paired fail.