Heads Up :
The post you are writing will appear in a public forum. Please ensure all content is appropriate for public consumption. Review the employee guidelines for the community here.
Hello All, as per the above and to provide further information by example:
If the router is subinterfaced eg G0/0.1, G0/0.2 and G0/0.3 then connected to a switch with vlans 1, 2, 3 via G0/0 the switch must have its connected interface as a trunk.