Need help on switch configuration.

[pghimire1]

I am trying to stack 4 switch on a ring topology. All switch will be on layer 3

Vlan 1 will be on 192.168.21.X (ports 1-18)

Vlan 2 will be on 192.168.22.X (port 19-24)

Vlan 3 will be on 172.28.X.X (planning to make port 25-26)

We will have  2 sfp up links coming in and LACP must be enabled on these ports, whats the best way to connect these two up links? I am thinking on combining/link aggregation on ports(25) on switch 1 and 2 and then port 26 on switch 3 and 4. Assigning these to VLAN 3, then connect these 2 uplinks at each bonded ports.

Will this work? Any better ways to do this?

Also, Can traffic by default be able to communicate with each VLAN, since its on layer 3 ?

Any suggestions would be highly appreciated. Thank you.

[cj.johnson3cigna]

The layout of the stack will work as you have diagrammed it.

Bundling ports from different stack members is a good idea and will work with LACP. I would, however, only add those ports with the uplinks attached into the LACP bundle.

When you say that all switches will operate at L3 do you mean that you will create SVIs for all VLANs?

You will not be able to communicate to VLANs 1 & 2 over the uplink by default, you'd need to enable some kind of routing protocol over the uplink and advertise the VLAN 1 & 2 subnets into that protocol.