System Administration Guide: Network Interfaces and Network
Virtualization  Overview of NIC Driver Properties  NIC driver
properties that are configurable by using the dladm command fall
into one of two categories:  Properties of a NIC driver are
typically set with default values. However, certain networking
scenarios might require you to change specific property settings
of a NIC. These property settings can be either public or
private properties. For example, a NIC might be communicating
with an old switch that does not properly perform
autonegotiation. Or, a switch might have been configured to
support Jumbo frames. Or, driver specific properties that
regulate packet transmission or packet receiving might need to
be modified for the given driver. In this Solaris release, all
of these settings can now be reset by a single administrative
tool, dladm.