This is a regression with OVN due to using DGP on the worker switches: https://github.com/openshift/ovn-kubernetes/pull/688 Bug tracking OVN: https://bugzilla.redhat.com/show_bug.cgi?id=2006306
Testing failed on 4.9.0-0.nightly-2021-09-30-022250 today, PR may not merged yet.
Hey Weibin, this BZ is targeting 4.10, so you need to get a 4.10 nightly: https://amd64.ocp.releases.ci.openshift.org/#4.10.0-0.nightly
Tested and verified in 4.10.0-0.nightly-2021-10-01-141332. Muticast traffic cross three nodes.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (Moderate: OpenShift Container Platform 4.10.3 security update), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2022:0056