Configuring trunk and access interfaces

In this recipe, we will show how to configure access and trunk interfaces on Cisco IOS-based devices, and how to map interfaces to an access VLAN, as well as how to allow specific VLANs on the trunks.

Getting ready 

Following our sample topology, we will configure the interfaces on the devices. As shown in this table, we are only showing the VLANs for access01 and core01— the other devices are exact replicas:

Device	Interface	Mode	VLANs
Core01	Ethernet0/1	Trunk	10,20,100
Core01	Ethernet0/2	Trunk	10,20,100
Core01	Ethernet0/3	Trunk	10,20,100,200
Access01	Ethernet0/1	Trunk	10,20,100
Access01	Ethernet0/2	Trunk	10,20...