This attribute specifies the method to be used by the IMA group
when selecting links to be activated. This comes into effect only
when the configured links do not respect the maximum differential
delay (otherwise all links are accepted).
If leastDelay is chosen, first the link having the smallest delay is
selected as the reference link. The IMA group will then include all
links which respect the maximum differential delay relative to the
reference link.
If maxBandwidth is chosen, the IMA group will select the
maximum possible number of links, with each selected link
respecting the maximum differential delay relative to every other
selected link. When more than one possibility exists, the
combination which offers the least delay will be selected.