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I am working on setting up VLANS on a basically default switch configuration for my SMB network. They have 5 juniper ex2200 switches that are all on the same subnet and have only a default vlan. I want to do switch stacking via junos Virtual Chassis as well as VLANS.

As of now, only one switch is physically connected to my netgate/pfsense firewall gateway appliance also residing on the same subnet which acts as the DHCP server and default gateway for all nodes in our LAN ( 254 ip addresses all in 10.235.17.***/24).

The remaining switches are all consolidated into ports in the main switch and radiate out from this central point.

What I am unsure about is with the switch stacking I plan on doing should I configure vlans in my netgate at layer 3, or implement it on my switches at layer 2?

  • VLANs generally work at layer 2. When you configure VLANs on a layer-3 (non-switched) interface each interface has its own, disconnected set of VLANs. – Zac67 Apr 14 at 19:40
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If you want your firewall to be able to restrict traffic exchanged among your various VLANs, you should do your layer-3 configuration on the firewall.

If you don't want any limits on, for example, PCs or phones communicating with servers or security cameras in other VLANs, you can do layer-3 on your switches.

There is a trade-off involved. As you are most likely aware, your firewall has less interface bandwidth, and less forwarding capacity, than the switches.

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