[action] [PR:261] [active-standby] Fix the oscillation logic (#261) #269
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Approach What is the motivation for this PR? Fix the unexpected toggle introduced by the oscillation logic. Signed-off-by: Longxiang Lyu lolv@microsoft.com Work item tracking Microsoft ADO (number only): 28397786 How did you do it? The oscillation is introduced to allow the active side to toggle to standby if no heartbeat is received. The workflow is described as the following: (wait, active, up) ---> set oscillation timer [1] ... (wait, active, up) ---> (wait, wait, up) [2] (wait, wait, up) ---> (wait, active, up) ... (wait, active, up) <--- oscillation timer expires, toggle to standby [3] [1]: the ToR enters (wait, active, up), no heartbeats received, oscillation timer is set. [2]: the ToR consistently probes the mux status, and transits between (wait, active, up) and (wait, wait, up). [3]: when the oscillation timer expires and the ToR is (wait, active, up), make the toggle to standby request. We need to ensure that, the ToR is only allowed to transits between (wait, active, up) and (wait, wait, up) during [2]. So any link prober active/standby, mux standby, or link down events should cancel the oscillation. How did you verify/test it? UT Any platform specific information? Documentation
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Original PR: #261 |
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Approach
What is the motivation for this PR?
Fix the unexpected toggle introduced by the oscillation logic.
Signed-off-by: Longxiang Lyu lolv@microsoft.com
Work item tracking
Microsoft ADO (number only): 28397786
How did you do it?
The oscillation is introduced to allow the active side to toggle to standby if no heartbeat is received.
The workflow is described as the following:
(wait, active, up) ---> set oscillation timer [1]
...
(wait, active, up) ---> (wait, wait, up) [2]
(wait, wait, up) ---> (wait, active, up)
...
(wait, active, up) <--- oscillation timer expires, toggle to standby [3]
[1]: the ToR enters (wait, active, up), no heartbeats received, oscillation timer is set.
[2]: the ToR consistently probes the mux status, and transits between (wait, active, up) and (wait, wait, up).
[3]: when the oscillation timer expires and the ToR is (wait, active, up), make the toggle to standby request.
We need to ensure that, the ToR is only allowed to transits between (wait, active, up) and (wait, wait, up) during [2]. So any link prober active/standby, mux standby, or link down events should cancel the oscillation.
How did you verify/test it?
UT
Any platform specific information?
Documentation