When will ifOperStatus_prev be updated?

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1

How does it work? And when the status is updated from down->up?

2

All of the _prev values get updated when the poller polls the device. Basically…

  1. the poller runs
  2. it collects a new value
  3. it moves the current database value (ifOperStatus to ifOperStatus_prev)
  4. then it writes the new value to ifOperStatus

Scenario, you’re doing 5min polling and a device does down at 13:00 and comes back up at 13:15:

12:55

  • ifOperStatus = up
  • ifOperStatus_prev = up

13:00

  • ifOperStatus = down
  • ifOperStatus_prev = up

13:05

  • ifOperStatus = down
  • ifOperStatus_prev = down

13:10

  • ifOperStatus = down
  • ifOperStatus_prev = down

13:15

  • ifOperStatus = up
  • ifOperStatus_prev = down

13:20

  • ifOperStatus = up
  • ifOperStatus_prev = up
3

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