Multicast traffic is broken between VMs on different hypervisors using provider networks
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Ubuntu Cloud Archive |
Fix Released
|
Undecided
|
Unassigned | ||
Ussuri |
Fix Released
|
Undecided
|
Unassigned | ||
ovn (Ubuntu) |
Fix Released
|
Undecided
|
Unassigned | ||
Focal |
Fix Released
|
High
|
Frode Nordahl |
Bug Description
[Impact]
In an OpenStack Ussuri (both Focal and Bionic) cloud we discovered that multicast traffic would fail between VMs on different hypervisors and when using provider networks.
[Test Plan]
The upstream fix also contains an addition to the OVN testsuite confirming the correct behavior. We cat utilize this test case to perform both a control test on a unmodified package as well as confirming that a updated package fixes the problem.
[Regression Potential]
The fix touches a code path that is executed only when OVN is configured to enable handling of Multicast traffic. The fix has also been available for several upstream releases without any reported issues.
[Original Bug Description]
In an OpenStack Ussuri (both Focal and Bionic) cloud we discovered that multicast traffic would fail between VMs on different hypervisors and when using provider networks. The following table reflects what we found works/didn't work:
https:/
Based on this, I went looking at relevant changes upstream and found that this appears to have been fixed upstream, but not backported to OVN 20.03:
https:/
I backported this patch to the version of OVN in Ussuri here:
https:/
These patched packages have been tested on a customer site and confirmed to fix the problem.
I've attached the patch from the PPA for convenience.
Related branches
- James Page: Pending requested
-
Diff: 187 lines (+158/-1)3 files modifieddebian/changelog (+6/-1)
debian/patches/lp-1957817-ovn-northd-Add-localnet-ports-to-Multicast_Groups-cr.patch (+151/-0)
debian/patches/series (+1/-0)
summary: |
- Multicast traffic is broken between VMs on different hypervisors + Multicast traffic is broken between VMs on different hypervisors using + provider networks |
Changed in ovn (Ubuntu): | |
status: | New → Triaged |
importance: | Undecided → High |
Changed in ovn (Ubuntu Focal): | |
status: | New → In Progress |
importance: | Undecided → High |
assignee: | nobody → Frode Nordahl (fnordahl) |
Changed in ovn (Ubuntu): | |
importance: | High → Undecided |
status: | Triaged → Fix Released |
Changed in cloud-archive: | |
status: | New → Fix Released |
The attachment "Backport of 97778ab3e422ac0 71faa67f9f477fd 54977e9c04 to OVN 20.03.2" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.
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