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Merge pull request #8438 from donaldsharp/doc_on_sleep

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doc: Check for convergence, not sleep for convergence
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Donatas Abraitis 2021-04-10 19:35:52 +03:00 committed by GitHub
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doc/developer/topotests.rst
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@ -480,6 +480,15 @@ Some things to keep in mind:
- Avoid including unstable data in your test: don't rely on link-local
addresses or ifindex values, for example, because these can change
from run to run.
- Using sleep is almost never appropriate to wait for some convergence
event as the sole item done. As an example: if the test resets the peers
in BGP, the test should look for the peers reconverging instead of just
sleeping an arbitrary amount of time and continuing on. It is ok to
use sleep in a tight loop with appropriate show commands to ensure that
the protocol reaches the desired state. This should be bounded by
appropriate timeouts for the protocol in question though. See
verify_bgp_convergence as a good example of this. If you are having
troubles figuring out what to look for, please do not be afraid to ask.
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