https://github.com/RedHatQE/openshift-virtualization-tests/blob/main/tests/network/localnet/test_ovs_bridge.py#L17 test fails in CI only on bm09a-tlv2: it used to fail on 4.18 lane (quarantined now), and has started failing on 4.21 as well. On 4.19 and 4.20 lanes the test passes. The common thing in failures is the cluster - bm09a-tlv2. I run manually this test on other different tlv2 clusters and cannot catch the failure, but once I was able to run it manually on bm09a-tlv2 -> caught the failure.

The test logic is the same for all lanes: the test creates localnet ovs bridge on secondary iface with vlan and then checks tcp connection between VMs connected to that bridge.

Probably, there is an issue with vlan NIC setup on the cluster nodes (only guessing). I am not able to investigate the issue deeper due to dense cluster usage in CI.