In an N:1 Redundancy Group, the M-SBCs must be upgraded first, followed by the S-SBCs.

The procedure to upgrade a Redundancy Group containing two S-SBCs in a 1:1 HA formation is essentially the same as the process to upgrade up to five M-SBC instances in an N:1 Redundancy Group, except that you only need to upgrade two nodes. To upgrade an S-SBC 1:1 HA deployment, refer to the procedure Upgrading M-SBCs in an N:1 Redundancy Group and complete the steps to upgrade the first two nodes, beginning with the standby S-SBC.


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