This read-only PnniPortId reports the port identifier of the port associated with a given PNNI event, such as the link whose status changed. An administrator uses this to identify exactly which local port a PNNI link-status or related event pertains to when multiple PNNI links exist on the switch. For example, an operator reads ciscoWANPnniPortId alongside ciscoWANPnniLinkStatus to know which specific port's adjacency state just changed rather than having to guess among several PNNI-enabled ports.