Best practice to change default gateway for HA-CAM

Hi,
The next week end, i will have a downtime to change it's HA-CAM's default gateway.
My question is, how can i do that?.
This change is not synchronized if i change only from an active cam (service Ip) o it does?
I was thinking on stops services for standby cam, then connect to a service ip, change its default gateway to active cam, then stops services and start them for standby cam and so on...
This is correct or this idea is wrong?
Please, I need suggestions.
Thanks for advance.

Kaylan
If the user vlan is routed on a L3 device before going to either the MPLS router or the firewall you could use PBR on the L3 device (if supported).
But as Reza says, we need more info on your network layout.
Jon

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