Extreme Networks: Regular LAG inside an MLAG Config

There are 2 core switches and an edge switch.

There is an ISC Link between the core switches.

The Edge Switch should be connected via „Regular LAG“ to both cores through port 1 and port 2.

CONFIGURING MLAG „Edge on two Cores“
Does it mean we should configure Port Sharing an the Edge?

enable sharing 1 grouping 1,2

There is only ONE Port „1“ on the Edge later.

CONFIGURING MLAG „Core on two Edges“
Because of the shared Port 1(1+2) there is no chance to configure it.