Forum Discussion
kridsana
Cirrocumulus
CirrocumulusF5 Gratuitous-ARP issue when failover
Hi
Last night we upgrade F5 v. 11.5.4 to v.12.1.3
when we failover from old unit v.11.5.4 to newly unit v.12.1.3, We experience some IP has more request timeout than the rest (we ping ip of...
I am not sure what do you mean by neighbour units, but take into account next When the big-ip become active in send 5 garps per IP. Your router or switch may block garps thinking that it might be broadcast storm.
K91071055: The BIG-IP system now sends gratuitous ARPs as quickly as possible
But you may change the behaviour based on your business needs
K11985: Overview of the arp.gratuitousrate and arp.gratuitousburst database variables
Traffic flow also depend on switch mac table, not only arp table. If switch's mac table is not updated then you would expect delays.
If any of your VIPs IP does not belong to any slef-ip's subnet, big-ip will not sent garp for these IPs since there is no outgoing interface.
K15858: BIG-IP systems do not send gratuitous ARP requests under certain conditions
If you are using dynamic routes then it may take some time for route table update before the service is restored.