DLMP aggregation provides the following advantages:
The IEEE 802.3ad standard implemented by trunk aggregations does not have provisions to span multiple switches. Allowing failover between multiple switches in trunk mode requires vendor-proprietary extensions on the switches that are not compatible between vendors. DLMP aggregations allow failover between multiple switches without requiring any vendor-proprietary extensions.
Using IPMP for high availability in the context of network virtualization is very complex. An IPMP group cannot be assigned directly to a zone. When network interface cards (NICs) have to be shared between multiple zones, you have to configure VNICs so that each zone gets one VNIC from each of the physical NICs. Each zone must group its VNICs into an IPMP group to achieve high availability. The complexity increases as you scale configurations, for example, in a scenario that includes large numbers of systems, zones, NICs, virtual NICs (VNICs), and IPMP groups. With DLMP aggregations, you create a VNIC or configure a zone's anet resource on top of the aggregation, and the zone sees a highly available VNIC.
DLMP aggregation enables you to use the features of link layer such as link protection, user-defined flows, and the ability to customize link properties, such as bandwidth.