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Upgrading form R81.10 to R81.20

I am upgrading my firewalls appliances members  in a cluster from R81.10 T87 to R81.20.

I am using the Installation and Upgrade Guide R81.20 page 417 on Zero Downtime Upgrade of a Security Gateway Cluster and it is not accurate!!

Procedure:
1. On each Cluster Member, change the CCP mode to Broadcast
Important - This step does not apply to R80.30 with Linux kernel 3.10 (run the
"uname -r" command).
Best Practice - To avoid possible problems with switches around the cluster
during the upgrade, we recommend to change the Cluster Control Protocol
(CCP) (CCP) mode to Broadcast.
Step Instructions
1 Connect to the command line on each Cluster Member.
2 Log in to the Expert mode.
3 Change the CCP mode to Broadcast:
[Expert@FW1:0]# cphaconf set_ccp broadcast
Notes:
This change does not require a reboot.
This change applies immediately and survives reboot.

Actual output:

1) First issue

[Expert@FW1:0]# cphaconf set_ccp broadcast

CCP mode is only unicast
This command is obsolete

[Expert@FW1:0]#

which is ok if that is not problem since it is only unicast now.

2) do we need to remove the standby member from the cluster and add it back in?

If so what is cli commands to add/remove memb

...
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