Hi! I did a simple lab, here my conclusions:
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Doing a "tmsh load sys config" doesn't force gratuitous arp
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Configuring MAC masquerade in a standalone box (in the default traffic group) doesn't change the MAC Address, nor force a gratuitous arp
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Do a a "Force Offline" and then a "Release Offline" don't force gratuitous arp
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Reboot the F5 doesn't force gratuitous arp (that was a surprise for me)
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As a workaround, I'm seeing the arping tool is installed, but I tried "arping -q -c 1 -A self_ip" and it sent to all the configured vlans a gratuitous arp with the MAC of the Management port (so it's not useful), and "arping -q -c 1 -I vlan1 -A self_ip" didn't work
Does anybody have any other idea?