This depends on a lot of other factors so will share a few ways I have cutover to new HA pairs in the past:
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Cloned confit then re-IP’ed all Self-IP’s and disables all VS’s and VS Addresses. Bring system online and allow all monitors to bring up pools, do a check etc. To migrate disable VS Address on the original and enable on the new, likely to need an ARP and MAC table clear on the connected switches.
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If using F5 GTM/DNS as well then do the same as above but re-IP all the VS’s as well then update GTM/DNS pools etc. This is the cleanest way to migrate because as long as the configuration is all working can manage migration per FQDN with each application tested etc.
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Finally the direct cut over as you have stated above. Here I have often re-IP’ed the Self-IPs on the server side VLANs to allow the monitors to work and pools to come up before migration takes place and speeds up the cutover. Again clear ARP and MAC address tables on the connected switches during cutover. Have seen this method used so well had very little disruption but that bepend on the applications and your individual setup.
Hope this helps a bit.