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As part of

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switch-over process, the
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must move the IP (floating IP) to a different NIC. The
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reconfigures the NICs appropriately and then broadcasts a GARP reply to inform neighboring devices about the change in the MAC address for the floating IP. Devices that receive the ARP packet then update their ARP tables with the new MAC address.

Note

There is a minor different difference between 

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'
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and hardware-based
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s. For the case of hardware-based SBCs during a switchover, both the IP and MAC addresses of the active node's non-management interfaces are migrated to the standby. For SBC SWe during a switchover, only the IP address is migrated from active to standby (the newly active node will use its own MAC addresses).

In both cases, the L2 tables of attached switches are updated; however in the case of SBC SWe, the routers' ARP tables must be updated as well.

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