Ethernet virtual circuits (EVCs) define a Layer 2 bridging architecture that supports Ethernet services.

An Ethernet Virtual Connection (EVC) is defined by the Metro-Ethernet Forum (MEF) as an association between two or more user network interfaces that identifies a point-to-point or multipoint-to-multipoint path within the service provider network. An EVC is a conceptual service pipe within the service provider network. A bridge domain is a local broadcast domain that is VLAN-ID-agnostic. An Ethernet flow point (EFP) service instance is a logical nterface that connects a bridge domain to a physical port or to an EtherChannel group in a switch. An EVC broadcast domain is determined by a bridge domain and the EFPs that are connected to it.

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SY/configuration/guide/sy_swcg/ethernet_virtual_connection.html