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Add second ICX switch

New Contributor III
First of all, great product and great community! Thank you!

So today I went out and bought another ICX switch (7150-c12p) and would like to use it on another room. It is running the router image (layer 3)

My core router has two vlans: vlan 30 (users) and vlan 200 (phones).

How would I go if I want to configure this new router to support both vlans.

Here is my try (didn't work btw):

lag test static id 1
ports ethernet 1/2/1 to 1/2/2

vlan 30 name users
untagged ethernet 1/1/1 to 1/1/12
tagged lag 1

vlan 200 name phones
tagged ethernet 1/1/1 to 1/1/12 lag 1

ip route is my gateway.

Am I over complicating things?


New Contributor III
Thank you all!

So I think I've made some mistakes during the writing of this post and also mistakes trying not to openly comment on my subnetting.

The ip address used on the ve interfaces is wrong. It's a typo. The correctly IP addresses for the ve interfaces end in a .1 indeed and no .0 (sorry bout that).

My router's ip is not actually, it is

To clear up things (sorry bout that again) this is my current setup on the larger switch (layer 3):

it has 2 vlans: 30 (users) and 200 (voice). All routing is done on this switch and it has a static route to the router (ip route Actually I would like to only hit the router for external (internet) requests.

Now what I would like to do is to integrate an extra switch (12 port) into this. I know I can stack them but as a learning escenario I would like not to as this would be my common case.

As a way to separate users (not voice) I would like to place them on a different subnet ( on the smaller switch.

Do I need to turn the smaller switch to a layer 2 for this or can I keep it as layer 3?

The new vlan 40 ( should be declared on the big switch, small switch or both?

I would like both switches to communicate through a lag just so I can have a backup connection in case the first one goes down.

With the implementation of both switches I would still like to keep the routing inside the switches and only hit the router for internet access.

BTW, large switch has a static ip of and that how it communicates with the router back and forth.

Next step would be to learn about spanning tree and then about voice priority.

Thank you!

New Contributor III
Honestly, it sounds like this is a small network and probably doesn't need routing configured.

Having two devices with vlan 30 configured, but with different IP addressing will require routing, and you'll need to keep the traffic separated by a routing device (could be static routes).

Unless you have a reason to have a separate broadcast domain/routing environment (say this were at a remote site rather than in the same IDF/building), I'd probably keep all of your users on the segment instead of introducing

The ip address on your larger switch is very likely only used for management purposes, not for routing.

What was said above about stacking being an easy solution for extending the configuration to another switch for ease of management is 100% correct.

If you're not stacking the switches, you need to identify how the traffic is passing back and forth between the switches and while untagged 30 and tagged 200 will work, it would be cleaner to have tagged 30 and tagged 200 for the "trunk" port.

You didn't mention brand of voip phones - chances are very good that configuring LLDP-MED will help with the voice vlan assignment for your phones.

New Contributor III
Trunk was the keyword I needed! Thank you!

Understood and also got it working properly.

Contributor III
What he is saying that is key is that the reason you want to trunk is to not risk inconsistent VLANs.

Specifically, if you had untagged vlan 60 connected on another switch to untagged vlan 70, frames end up moved to the wrong VLAN and it creates hastles to troubleshoot.


What you never said is if your two switches are in the same network closet.  If yes, you would be better off stacking them from both a configuration and a management perspective.

You would make them both run the same firmware to stack...
config t
stack enable
hitless-failover enable
stack secure-setup

Verify the topology and unit ID numbers....

Then you have one (1) logical switch.

It's just more clean that way.

New Contributor III
Currently both switches are sitting together but wanted to learn how to do it this way. Already ordered a couple of SFP cables that may arrive soon so I can learn how to stack.

Now onto learning how to give voice priority with lldp.

Thank you all! And sorry for not explaining myself better sometimes.