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Existing Standard Solutions - IETF Defacto State Model based on ifOperStatus and ifAdminStatus Admin up(1), -- ready to pass packets down(2), testing(3) -- in some test mode Oper up(1), -- ready to pass packets down(2), testing(3), -- in some test mode unknown(4), -- status can not be determined for some reason. dormant(5), notPresent(6), -- some component is missing lowerLayerDown(7) -- down due to state of lower-layer interface(s)