pc/test_lag_2.py failed on virtual testbed t0

[lguohan]

Description

Steps to reproduce the issue:

1. py.test $PYTEST_COMMON_OPTS --log-file ~/abc.log pc/test_lag_2.py | tee ~/abc.txt

Describe the results you received:

        res = self.module(*module_args, **complex_args)[self.hostname]
        if res.is_failed and not module_ignore_errors:
>           raise RunAnsibleModuleFail("run module {} failed, errmsg {}".format(self.module_name, res))
E           RunAnsibleModuleFail: run module shell failed, errmsg {'stderr_lines': [u'WARNING: No route found for IPv6 destination :: (no default route?)', u'lag_test.LacpTimingTest ... FAIL', u'', u'======================================================================', u'FAIL: lag_test.LacpTimingTest', u'----------------------------------------------------------------------', u'Traceback (most recent call last):', u'  File "/tmp/lag_test.py", line 155, in runTest', u'    self.assertTrue(abs(current_pkt_timing - float(self.packet_timing)) < 0.1, "Bad packet timing: %.2f seconds while expected timing is %d seconds from port %s out of %d intervals" % (current_pkt_timing, self.packet_timing, self.exp_iface, self.interval_count))', u'AssertionError: Bad packet timing: 30.00 seconds while expected timing is 1 seconds from port 28 out of 3 intervals', u'', u'----------------------------------------------------------------------', u'Ran 1 test in 102.329s', u'', u'FAILED (failures=1)'], u'cmd': u"ptf --test-dir /tmp lag_test.LacpTimingTest --platform-dir /root/ptftests --platform remote -t 'packet_timing=1;interval_count=3;ether_type=34825;timeout=35;exp_iface=28' --relax --debug info", u'end': u'2020-04-29 03:36:21.275888', '_ansible_no_log': False, u'stdout': u'', u'changed': True, u'start': u'2020-04-29 03:34:37.556191', u'delta': u'0:01:43.719697', u'stderr': u'WARNING: No route found for IPv6 destination :: (no default route?)\nlag_test.LacpTimingTest ... FAIL\n\n======================================================================\nFAIL: lag_test.LacpTimingTest\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File "/tmp/lag_test.py", line 155, in runTest\n    self.assertTrue(abs(current_pkt_timing - float(self.packet_timing)) < 0.1, "Bad packet timing: %.2f seconds while expected timing is %d seconds from port %s out of %d intervals" % (current_pkt_timing, self.packet_timing, self.exp_iface, self.interval_count))\nAssertionError: Bad packet timing: 30.00 seconds while expected timing is 1 seconds from port 28 out of 3 intervals\n\n----------------------------------------------------------------------\nRan 1 test in 102.329s\n\nFAILED (failures=1)', u'rc': 1, u'invocation': {u'module_args': {u'warn': True, u'executable': None, u'_uses_shell': True, u'strip_empty_ends': True, u'_raw_params': u"ptf --test-dir /tmp lag_test.LacpTimingTest --platform-dir /root/ptftests --platform remote -t 'packet_timing=1;interval_count=3;ether_type=34825;timeout=35;exp_iface=28' --relax --debug info", u'removes': None, u'argv': None, u'creates': None, u'chdir': u'/root', u'stdin_add_newline': True, u'stdin': None}}, 'stdout_lines': [], u'msg': u'non-zero return code'}

Describe the results you expected:

Additional information you deem important:

**Output of `show version`:**

```
(paste your output here)
```

**Attach debug file `sudo generate_dump`:**

```
(paste your output here)
```

abc.txt
abc.log

[Blueve]

Init investigation
lag_test.LacpTimingTest PTF test fail

[Blueve]

I got same failure after resolve nbrhosts not found issue.
Seems like it is very similar with my another testcase dir_bcast.
I add fib fixture to force refresh route table before run dir_bcast test to solve that problem, I will try same for lag_2 test.
But it not works.

I noticed that the assertion show the lacp timing is around 30s which is expected if lacp mode is in default state, might be the lacp command need time to take effect? I will add some code to ensure that.

[lguohan]

is this fixed?

[lguohan]

seems related to #2041