In RHOSP 17.1 system, customer has a setup that is using 2 x F5 Load Balancer instances (vLB's) in Active/Standby mode:
host dpdk-0 <<< F5 vLB A
host dpdk-1 <<< F5 vLB B

Host dpdk-2 is used for iXIA Servers.
Host dpdk-3 is used for iXIA Clients.

iXIA Clients are sending traffic (and getting replies) to iXIA Servers via the active vLB.

The active vLB is owner of a "masquerade MAC".
Upon switchover, the newly active vLB becomes owner of the masquerade MAC and issues a GARP to announce this change.
Masquerade MAC is an F5 proprietary mechanism which is somewhat the MAC equivalent of a virtual IP address (VIP).

In switchover test, it takes 5 minutes before we can see traffic getting directed to the newly active vLB.

From sosreport:
ovs-vsctl_-t_5_list_Open_vSwitch:dpdk_version : "DPDK 23.11.2"
ovs-vsctl_-t_5_list_Open_vSwitch:ovs_version : "3.3.4-62.el9fdp"
ovs-vsctl_-t_5_list_Open_vSwitch:system_version : "9.2"

Note: this looks like a regression of BZ 2213892.