I have a stack of 2x 3850 L3 Cisco switches. This stack has multiple SVIs created for several VLANs and is use mainly for distribution (inter-vlan routing).
The problem with the stack is that I can't do patching without a downtime on the stack. Hence, I am breaking up the stack.
With the stack, I have 1 common IP/SVI/VLAN, if I break the stack,
Q1) Is HSRP/VRRP the only way for me to have 1 common gateway IP/VIP for my VLAN ?
Q2) Can I use HSRP on SVIs and use the trunk link between the 2 x L3 switches for the HSRP hello packets as I do not want to use physical interfaces + 3rd switch for the HSRP communication
Q3) I have multiple SVIs/VLANs on my current stack switch -> does that also mean when I breakup the stack and use HSRP instead, I would need to have multiple HSRP groups running concurrently for the different VLANs ?