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If you have two interfaces and only want link-based failure detection, just put the group $YOUR_GROUPNAME statement in /etc/hostname.$INTERFACE file.
Say you have the two interfaces e1000g0 and e1000g1, your hostname is MyHostname and your group is MyGroup you would do the following:
MyHostname group MyGroup in /etc/hostname.e1000g0.
Put group MyGroup in /etc/hostname.e1000g1.
Either reboot the machine or manually configure ipmp:
ifconfig e1000g0 group MyGroup
ifconfig e1000g1 plumb group MyGroup up
in /var/adm/messages you there should be an info that no test-adress was given and that ipmp will operate in link-failure detection mode only.
Please note that officially you should create an ipmp instance first by issuing something like ifconfig $MyIPMP-Instance group MyGroup, but that step could be left out as ipmp instances are created implicitly.
It would be help full . if you will explain you os /type, version ..