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First we will examine how we will do this in the router (how we are going to split the ports between vlans)

VLAN2 will use : PORTS 9 to 16 and 18 and 20
VLAN1 will keep: PORTS 1 to 8 and 17 and 19
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You can set this as you wish but by default this is how we will configure the VLANs.
Whatever ports you exclude from VLAN2 will by default STAY assigned to VLAN1