Firewall Core

Hello!!

Is it a good or bad idea to use firewalls as a core?

I would plug 3 switch stacks to them. 4 VLANs, 300-400 users max. They already have 2x Meraki MX100 for SD-WAN. 750Mbps throughput and they have an MPLS circuit + 1Gbps Internet breakout circuit. Corporate VPN traffic flow on top of the MPLS and Internet traffic gets out locally on the 1Gbps circuit. All their services are in our DC so very low traffic between VLANs.

I had the idea of buying a Core but our company is Cisco only and these 9400-9500 core switches are just too expensive. I'm not sure it's worth the price for them.

MX100 only supports SFP, no 10G. They don't support port channels as well so we're looking at 1G connections from the switch stack.

Let me know your thoughts!