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.