This object, when set to enable, makes this BGP speaker wait for the neighbor to initiate the TCP connection rather than attempting to open it itself. Administrators use passive mode when the peer is expected to always initiate, such as when this router's address might change or when avoiding duplicate connection-attempt races. For example, an engineer enables csBgpNbrPassive on a session to a customer router that's behind a NAT device, since only the customer side can reliably initiate the TCP connection.