Configuration restrictions and guidelines
When you configure a Reth subinterface, follow these restrictions and guidelines:
To create a Reth subinterface, create the Reth interface first.
You cannot create subinterfaces for a Reth interface in any of the following situations:
The members of the Reth interface are Layer 3 Ethernet subinterfaces.
A minimum of one subinterface is created on the member interfaces of the Reth interface.