This is a qualifier providing additional detail about the current State value for this virtual circuit. When State alone, for example offline, does not explain enough, an admin reads this qualifier for the specific reason behind it, such as a pending pinning failure or an upstream port issue, saving a trip into the fault log. A qualifier of 'no-oper-border-port-avail' would explain that this circuit is offline specifically because no usable uplink port could be pinned.