Virtual switch support for EVPNs

The Ethernet VPN (EVPN) solution on MX Series routers with MPC interfaces is extended to provide virtual switch support that enables multiple tenants with independent VLAN and subnet space within an EVPN instance. Virtual switch provides the ability to extend Ethernet VLANs over a WAN using a single EVPN instance while maintaining data-plane separation between the various VLANs associated with that instance. A single EVPN instance can stretch up to 4094 bridge domains defined in a virtual switch to remote sites.