nevermind .. i found that its created automaticaty even if there is no ae interfaces created ..
according to KB28265 :
The limit of number of units or VLANs that can be created per physical interface on a DPC card is 4096. However, one of those logical units (32767) is created to accept untagged packets that come in on an interface. Therefore, the limit is 4095 configurable logical units.