This shows the actual CC/CV mechanism that both ends of the pseudowire negotiated down to and are currently using in operation, which may differ from either the local or remote configured preference if only a subset of mechanisms is mutually supported. This is the field that matters most for actually running VCCV connectivity checks, since it reflects reality rather than either side's individually configured intent. If this shows a weaker or different mechanism than what was locally configured, it's a sign the remote peer's platform doesn't support the locally preferred VCCV type.