I have a Catalyst 3750 series switch-stack with 3 switches in the stack. All of my clients are connected to the 10/100 ports of the switch-stack.

I have 10 servers connected to 10/100/1000 SFP plugs (4 in each switch)

Our gateway (firewall) for all the clients and servers is plugged into one of the SFP 10/100/1000 ports of the switch-stack, and the firewall itself is a 10/100/1000 port...

Does all the traffic have to flow through the gateway (firewall), limiting throughput to the firewall's 10/100/1000 port?

I apologize if this is a silly question, but I really need help...

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    Aug 7, 2017 at 16:26

1 Answer 1


Only traffic destined for a VLAN (subnet) which is different from the one on which it originated needs to travel through the router. Intra-VLAN traffic will not use a router, but inter-VLAN traffic will.

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