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Keep incrementing sequence number when link prober is suspended and s…
…hutdown #55 (#65) ### Description of PR Unable to cherry-pick the commit below cleanly from master branch: 13f4879 Jing Zhang Sun Apr 3 21:56:33 2022 -0700 Keep incrementing sequence number when link prober is suspended and shutdown (#55) Summary: Fixes # (issue) This PR is fix the issue when both sides' link prober is suspended, LinkManager still appears to be healthy. When HB suspends, TX sequence number is not updated either, hence link prober won't post an `unknown` event. sign-off: Jing Zhang zhangjing@microsoft.com ### Type of change - [x] Bug fix ### Approach #### What is the motivation for this PR? Make sure link prober is reporting `unknown` event when it's suspended or shutdown on both sides. #### How did you do it? Increment sequence number even when HB is not sent. #### How did you verify/test it? Tested on dualToR testbed.
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