UPF Downgrade
Perform the following steps to downgrade the UPF:
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Perform Health Check on the UPF.
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Change boot priority to the N-1 build on the Standby UPF. Reload the Standby UPF.
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Do "sx-peer configuration" on the downgraded Standby UPF.
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Perform Health Check on both the UPF nodes and then do UPF switchover.
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Perform Step 1 to Step 3 on the new Standby UPF.