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2 stack of redundant network cores

abtt-39
Level 1
Level 1

Hello,

Currently, our network has a collapsed core type design.

But we only have one network core (a stack of 4 x 3850 switches).

Routing, svi, ACL... are on the core network

9 stacks of 2960 access switches are connected to this core network.
3 of these stacks are reserved to connect our esx servers, storage array. the other 6 are used to connect PCs, IP phones, etc...

So we don't have distribution layer switch.

and put a double attachment of each access switch to core 1 and core 2, and connect these 2 cores by a redundancy protocol 'in active / standby mode?).

we want to replace core 1 with a stack of 9300 and 9300 too for core 2.

what protocol used, hsrp, vrrp?
If we set up a redundancy protocol between 2 stacks, how does it work?
Do the stack and the hsrp / vrrp not contradict each other?
If I make a modification on core 1, does the hrp/vrrp apply this modification on core 2?

Thanks.

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