Cisco IS-IS Circ Level ID

1.3.6.1.4.1.9.10.118.1.4.1.1.6

On a point to point circuit with a fully initialized adjacency to a peer IS, the value of this object is the circuit ID negotiated during adjacency initialization. On a point to point circuit without such an adjacency, the value is the concatenation of the local system ID and the one byte ciiCircLevelIDOctet for this circuit i.e. the value that would be proposed for the circuit ID. On other circuit types, the value returned is the zero length OCTET STRING.