As the agent is monit arp and nd proxy config, forwarding config for ipv4 and ipv6 should be monit to avoid connectivity issues:

/var/log/messages-20250302:Mar  1 23:14:55 networker-dvjbnlua-2 ovn_bgp_agent[27154]: 2025-03-01 23:14:55.679 2 DEBUG ovn_bgp_agent.utils.linux_net [-] IP fd53:d91e:400:7f17::1 already added on bridge br-ex ensure_arp_ndp_enabled_for_bridge   /usr/lib/python3.9/site-packages/ovn_bgp_agent/utils/linux_net.py:147#033[00m
 /var/log/messages-20250302:Mar  1 23:19:55 networker-dvjbnlua-2 ovn_bgp_agent[27154]: 2025-03-01 23:19:55.672 2 DEBUG ovn_bgp_agent.utils.linux_net [-] IP 169.254.0.1 already added on bridge br-ex ensure_arp_ndp_enabled_for_bridge   /usr/lib/python3.9/site-packages/ovn_bgp_agent/utils/linux_net.py:147#033[00m