This lab shows two sites, A and B. Site A has a switch connecting to the PE router and Site B goes through a IOS device acting as a CE. MPLS is configured on the Provider routers, bridging is done through CE1 and an xconnect has been configured between PE1 and PE2. The hosts are Cisco devices with just a default route configured. This lab relates to the Bridging Layer 2 Across the Core blog.