| Description | For horizontal links and uplinks, this attribute contains
the port identifier of the port at the remote end of the
link as assigned by the remote node. If unknown, the PNNI
protocol entity sets this attribute's value to zero.
For nodes, this attribute contains the port identifier of
the port at the other end of the spoke or bypass from the
originating port. When the originating port ID is zero, a
value of zero indicates the default radius. When the
originating port ID is non-zero, a value of zero indicates
the nodal nucleus. |