Whenever I try to configure my sub interface on my ethernet port with a IP ADDRESS I get the message below. I have tried several routers and all of them give me the same ERROR. 2620, 2610 and 2620
Configuring IP routing on a LAN subinterface is only allowed if that
subinterface is already configured as part of an IEEE 802.10, IEEE 802.1Q,
or ISL vLAN.