The following limitations apply to VLAN aggregation:
No additional routers may be located in a subVLAN. This feature is only applicable for “leaves” of a network.
A subVLAN cannot be a superVLAN, and vice-versa.
SubVLANs are not assigned an IP address.
A subVLAN should belong to only one superVLAN.
A subVLAN or superVLAN should not be added to a private VLAN
Before you can delete a superVLAN, you must delete all subVLANs in that superVLAN.
When configuring a subVLAN address range, all addresses in the range must belong to the superVLAN subnet.