is used to configure the second port on the dual-port NIC as the backup port of a redundant pair.
The single-port on the other NIC is configured to be the primary port of the redundant pair.
Primary
Cluster-to-LAN
and Backup
Interconnect
Path
Backup Cluster-to-LAN and
Backup Interconnect Path
Node 1
Hub
Clients
Primary
Interconnect Path
Node 2
Primary
Cluster-to-LAN
and Backup
Interconnect
Path