To ensure continuous availability of the network to send or receive traffic, IPMP performs failure detection on an IPMP group's underlying IP interfaces. Failed interfaces remain unusable until they are repaired. Any remaining active interfaces continue to function while any existing standby interfaces are deployed, as needed.
The in.mpathd daemon handles the following types of failure detection:
Probe-based failure detection:
No test addresses are configured (transitive probing)
Test addresses are configured
Link-based failure detection, if supported by the NIC driver
For more details, see Failure Detection in IPMP in Administering TCP/IP Networks, IPMP, and IP Tunnels in Oracle Solaris 11.2 .