BGP Virtual Private Wire Service (VPWS) is a point-to-point Layer 2 VPN service based on RFC 6624 Layer 2 Virtual Private Networks using BGP for Auto-Discovery and Signaling, which in turn uses the BGP pseudowire signaling concepts described in RFC 4761, Virtual Private LAN Service Using BGP for Auto-Discovery and Signaling.
The BGP-signaled pseudowires created can use either automatic or preprovisioned SDPs over LDP- or BGP-signaled tunnels; the choice of tunnel depends on the tunnel's preference in the tunnel table, or over GRE. Preprovisioned SDPs must be configured when RSVP signaled transport tunnels are used.
The use of an automatically created GRE tunnel is enabled by creating the PW template used within the service with the parameter auto-gre-sdp. The GRE SDP and SDP binding are created after a matching BGP route is received.
Inter-AS model C and dual-homing are supported.