[action] [PR:13410] Fix arp/test_unknown_mac by disabling arp_update#14121
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mssonicbld merged 1 commit intosonic-net:202405from Aug 14, 2024
Merged
[action] [PR:13410] Fix arp/test_unknown_mac by disabling arp_update#14121mssonicbld merged 1 commit intosonic-net:202405from
mssonicbld merged 1 commit intosonic-net:202405from
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What is the motivation for this PR? Test was flaky. Monitoring tcpdump on the PTF container and the DUT's fdb table shows IPv6 echo is causing mac addresses to be learned on the DUT even though it was previously flushed. How did you do it? Disable IPv6. How did you verify/test it? Disabling IPv6 will allow the test to consistently past. If IPv6 is re-enabled during the test and packets are sent, it immediately fails. Any platform specific information?
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Original PR: #13410 |
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Description of PR
The DUT will occasionally (~5 mins) send a echo request through IPv6 to the PTF container. When the PTF container replies, it populates the fdb table. This is bad because the test expects the fdb table to be empty.
Temporarily disabling IPv6 on the PTF container during the test will eliminate the problem.Temporarily disabling
arp_updateon the DUT during the test will eliminate the problem.Summary:
Fixes #
Type of change
Back port request
Approach
What is the motivation for this PR?
Test was flaky. Monitoring tcpdump on the PTF container and the DUT's fdb table shows IPv6 echo is causing mac addresses to be learned on the DUT even though it was previously flushed.
How did you do it?
Disable IPv6.
How did you verify/test it?
Disabling IPv6 will allow the test to consistently past. If IPv6 is re-enabled during the test and packets are sent, it immediately fails.
Any platform specific information?
Supported testbed topology if it's a new test case?
Documentation