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You don't have to have second I/O domain to achieve link redundancy, but if your concent is HA then you may want to create a second I/O domain. with second I/O domain you can cover almost all the case when you have to reboot primary domain.
There are two way to create link redundancy, one is use IPMP the other is use LACP if your switch support. IPMP need to configure are LDOM level, LACP can be created at primary domain and map in to LDOM.
each LDOM need a OS, if you don't want to install addation OS than use Zone, it will give you almost same as LDOM except Zone share kernel with Global Zone.