The value of vRtrIfOperDownReason specifies the reason why the interface is operationally down. The bit values are: 'ifAdminDown (0)' - Interface is administratively down 'svcAdminDown (1)' - Service is administratively down 'portOperDown (2)' - SAP port is operationally down 'addrOrIfNotReady (3)' - Address or Parent interface is not ready 'assocObjNotReady (4)' - Associated object is not ready 'rvplsDown (5)' - R-VPLS service is down 'operGrpDown (6)' - Associated Operational Group is down 'ifAdminDestroy (7)' - Interface is being deleted 'noIfAddress (8)' - Interface address is not configured 'noIfInfo (9)' - Interface info not present 'delayedStartEnabled (10)' - Delayed start timer is enabled on the interface 'ifProtoOperDown (11)' - Protocols on interface are operationally down 'invalidPortCfg (12)' - Port configuration is not valid 'unknown (13)' - Reason is unknown 'ipv6Misconfig (14)' - Ipv6 misconfiguration.