Fix flakiness in pfcwd/test_pfcwd_cli.py#20247
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yejianquan merged 3 commits intosonic-net:202505from Aug 20, 2025
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Original PR: #19969 |
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@StormLiangMS please help in merging the PR |
lolyu
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Description of PR
Summary:
Fixes #714, #18496
Type of change
Back port request
Approach
What is the motivation for this PR?
Recent fix: #17411
The test was flaky before this fix (and continues to be so). When the test picks up an egress interface which happens to be a member of a LAG consisting of multiple members, only this member is stormed and some of the traffic successfully egresses out of the other LAG members leading to lesser drops than expected when PFCWD is triggered with DROP action. The proposed fix was to shut down all but one LAG members by reducing the number of min_links. But the same config on cEOS was missing therefore LAG doesn't come up after shutting down other LAG members.
This is being rectified in this change for cEOS neighbors.
How did you do it?
The proposed fix is to change the min_link setting for the involved port channel on the cEOS side as well.
How did you verify/test it?
Stressed this test 10 times on dualtor-120 and t0-116 with Arista 7260CX3 platform.
Any platform specific information?
Supported testbed topology if it's a new test case?
Documentation