Meraki MX HA with Layer3 Switch

[househed]

Hi all,

Was wondering if I can cable two MXs in HA and a Layer 3 switch stack like the image? See the extra green lines.

At the moment I only have one cable running between each MX and switch stack member.

Thanks.

[alemabrahao · Accepted solution]

Yes, just be sure to enable the STP on the switches. The MX doesn't support LACP, so enable the STP is a recommendation.

https://documentation.meraki.com/MX/Networks_and_Routing/MX_Layer_2_Functionality#LACP_.26_Link_Aggr...

[househed]

Awesome, thank you.

STP is already enabled on the stack.

Also, to add more complication to it, what if I run an extra cable between them for a Guest WiFi VLAN from the MX. See the red in the image.

[alemabrahao]

I don't recommend this topology. I think that a trunk port is the best option.

Take a look at this.

https://documentation.meraki.com/Architectures_and_Best_Practices/Cisco_Meraki_Best_Practice_Design/...

[househed]

Good to know, thanks.

A trunk port with VLAN10 as the Native VLAN and add the extra VLAN(s) to the trunk?

[alemabrahao]

Yes, is the VLAN 10 your management VLAN?

[househed]

Its the transit VLAN for the traffic from the switch stack VLANs out to the internet/SD-WAN

[alemabrahao]

I got it. Go ahead.

[househed]

Awesome, thanks for your help.