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Hi!

First I suggest you to do it in smaller eg. in a LAB environment. Thats gives you confidence.

If I understood correct (from a little pieces of info)

Q: Before I build out the new 9100s, I'd like to delete the "Old ISP" from the eth2 interface and move my new  Backup ISP interface currently on Mgmt to eth2.

Here is the exact steps how to add or remove Interface from a Cluster.

https://support.checkpoint.com/results/sk/sk57100

1. put the standby member to down
2. You need to remove the ClusterIP-s first -> to achieve this delete the IF in the SmartConsole -> then policy install. Only after this change anything on GAIA portal.
3. If you do this, the old ISP stopped working immediately, but eth2 will released.

This would be the goal?

Akos