This read-only object identifies the Virtual Circuit Identifier for the pseudo-wire. The VCID is the identifier both ends of the pseudowire use to agree they're talking about the same virtual circuit, similar in spirit to a VPI/VCI pairing in ATM, so a VCID mismatch against what's configured on the peer's PE router would prevent the pseudowire from establishing, appearing on the CMTS as a properly configured but never-up connection. A VCID of 500 configured here must exactly match the VCID configured for the corresponding pseudowire on the enterprise customer's PE router, or the two ends will never successfully pair up.