i configured two brand new 5820-24XG with irf as core switches. everything works fine so far, except one thing:
the switches act as routers, the default route points to a firewall cluster. when there's a failover from firewall node 1 to firewall node 2, the mac adress of the cluster ip changes. the firewall send gratuitous ARPs, to make the switches being aware of the new mac adress. i double-checked it with wireshark. the 5820-24XG are configured with "gratuitous-arp-learning enable" by default. but the 5820-24XG ignore it. there's still the wrong mac adress in the arp table. it set the arp cache lifetime to one minute to minimize the routing outage. i didn't configure any arp security, so i believe gratuitous-arp-learning should work.
