VM migration: Reduce downtime using LSP IFSTATE #4774
Draft
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
What this PR does and why is it needed
Ccurrently all pods have the LSP.Enabled option set to true by default.
During migration, it makes sense to handoff the network traffic from the
source to target pod as soon as the target pod is up and ready for
traffic.
This PR is performing this handoff by closing the LSP of the source port.
Doing this significantly reduces the migration downtime.
This traffic handoff optimization is currently restricted to VM with
only secondary interfaces, and layer2 topology.
Which issue(s) this PR fixes
Fixes #
Special notes for reviewers
How to verify it
Run migration tests.
Details to documentation updates
Migration downtime results:
pre-copy:
post-copy:
Description for the changelog
Does this PR introduce a user-facing change?