Skip to main content
Cisco Meraki

vMX Setup Guide for Microsoft Azure

Overview

This document is a walkthrough for setting up a virtual MX appliance in the Azure Marketplace. After completing the steps outlined in this document, you will have a virtual MX appliance running in the Azure Cloud that serves as an AutoVPN termination point for your physical MX devices.

Key Concepts

Before deploying a virtual MX, it is important to understand several key concepts:

Concentrator Mode 

All MXs can be configured in either NAT or VPN concentrator mode. There are important considerations for both modes. For more detailed information on concentrator modes, click here.

One-Armed Concentrator 

In this mode, the MX is configured with a single Ethernet connection to the upstream network. All traffic will be sent and received on this interface. This is the only supported configuration for MX appliances serving as VPN termination points into Azure Cloud.

NAT Mode Concentrator 

In this mode the MX is configured with a single Ethernet connection to the upstream network and one Ethernet connection to the downstream network. VPN traffic is received and sent on the WAN interfaces connecting the MX to the upstream network and the decrypted, unencapsulated traffic is sent and received on the LAN interface that connects the MX to the downstream network. 

If you wish to change the concentrator mode after the vMX deployment, you must restart the instance for the changes to be applied. Please choose the desired concentrator mode before the vMX deployment.

VPN Topology

There are several options available for the structure of the VPN deployment.

Split Tunnel 

In this configuration, branches will only send traffic across the VPN if it is destined for a specific subnet that is being advertised by another MX in the same Dashboard organization. The remaining traffic will be checked against other available routes, such as static LAN routes and third-party VPN routes, and if not matched will be NATed and sent out the branch MX unencrypted.

Full Tunnel  

In full tunnel mode all traffic that the branch or remote office does not have another route to is sent to a VPN hub.

Azure Cloud Terminology  

This document will make reference to several key Azure-specific terms and concepts.

Azure Virtual Network

A virtual network is where a block of associated IP addresses, DNS settings, security policies and route tables can be configured and managed.

Azure Resource Manager (ARM) and Azure Classic

Azure has different types of virtual network environments, which represent two different methods of deploying and managing Azure virtual environments. The vMX uses 'managed applications', which is an MSFT platform, and is not compatible with Azure 'classic' deployments.

Resource group 

A resource group is a container within Microsoft Azure's infrastructure where resources, such as virtual machines are stored.

Azure Managed Applications

Managed Applications within Azure serve as the network used to manage and support the Cisco Meraki virtual MX.

Additional Information 

During the setup of your vMX instance, or over the course of working within Azure, you may encounter additional terminology which is not defined in this document. To find out more about these terms, and for additional details on the terms listed above, please see the Microsoft Azure glossary.

Meraki Dashboard Configuration 

Begin by creating a new Security Appliance network in your organization. This guide will walk you through creating a new network in the Meraki Dashboard.

1. Adding license(s) to the Meraki dashboard

The Meraki Dashboard will require a vMX license to be added before you are able to continue. If you do not have access to a vMX license, please reach out to your Meraki Reseller or Sales Rep.

Create a "Security appliance" network type: 

Screen Shot 2020-07-20 at 1.15.19 PM.png

Once you have created the "Security appliance" network and added the appropriate license you will be able to deploy a new vMX to your network by clicking on the 'Add vMX' button:

Screen Shot 2020-10-14 at 2.36.20 PM.png

Before generating the token, please verify the firmware is running MX 15.37+. If the vMX network is upgraded to anything below that, the upgrade will not occur.

2. Generate the authentication token

After you add the new vMX to your network, navigate to Security Appliance > Appliance status and select “Generate authentication token” to generate the token for the Azure "Meraki Authentication Token" data field.

Screen Shot 2020-10-19 at 8.09.23 PM.png

3. Copy the newly generated token and save it.

The newly generated token will be used in the Basics -> Instance details section when creating a new Azure managed application.

The authentication token must be entered into the Azure instance within 1 hour of generating it. If it has been more than 1 hour, then a new token must be generated. 

Azure Setup 

This section walks you through configuring the necessary requirements within Azure and adding a vMX instance to your Azure virtual network. For more details on setting up an Azure virtual network and other components, please refer to Microsoft Azure Documentation here.

Before You Begin

You must have the following before you begin:

  • An Azure virtual network and virtual subnet on a resource group separate from the resource group you will be creating to host the vMX. To find more information about this, please click here.

Your virtual network must be in a separate resource group from the one hosting your vMX. If you assign the vMX to a resource group that already contains a virtual network/virtual subnet, you will not be able to deploy the vMX.

This section walks you through configuring the necessary requirements within Microsoft Azure, and adding a vMX instance to your resource group. For more details on setting up a resource group and other components, please refer to Azure's Documentation here.

Accessing the Offer

To gain access to the VM Offer, please access this link. A screenshot of the Marketplace list of Cisco Meraki vMX in Azure is included below:

Screen Shot 2020-11-09 at 1.05.39 PM.png

Deployment Steps

From the Marketplace listing, click on 'Create.'

After creating, you will be prompted to configure basic settings for the managed app:

Project Details

  • Subscription: Choose the subscription that you want to be billed for from the drop-down menu.

  • Resource group: Create a new resource group with any name.

Instance Details

  • VM Name: Choose a name for your Cisco Meraki vMX VM, it can be any name.

  • Meraki Authentication Token: Paste the token previously generated on the Meraki dashboard.

  • Region: Select the region where the vMX will be deployed in.

  • Zone: Select the appropriate Availability Zone (AZ) for the Region selected above. 

Not all regions on Azure support Availability Zones (AZ), for the full list please check here. Select “NONE” for Zones that don’t support AZs. If a zone is selected for a region that does not support AZs the deployment will fail.

Screen Shot 2020-10-20 at 12.25.22 PM.png

Failure details:

Screen Shot 2020-10-20 at 12.23.53 PM.png

Managed Application Details

  • Application Name: Choose a name for your Cisco vMX managed application.

  • Managed Resource Group: Name for the managed resource group. This resource group will hold all the resources that are required by the vMX managed application. 

After completing all the basic settings configuration, go to the next step “Deployment Details”

Deployment Details

  • Configure Virtual Networks

    • Virtual Network: Choose an existing Virtual Network from the list. Minimum allowed prefix size for the virtual network is /24 and max is /8.

    • Subnet: Then choose the subnet in which the vMX will be deployed. To find more information about subnets in Azure, click here.

  • VM Size: Choose the VM size based on the vMX SKU you want to deploy. Recommended instance type for best performance is “Standard F4s_v2”.

vMX-L is currently not supported on Azure


Next, Review the deployment details and licensing information and hit ‘Create’. 

After you click on ‘Create,' the deployment will begin:

Once this has been completed, it may be several minutes before the deployment completes and the instance launches.  


 

Once the vMX is online, a route table needs to be created including the Auto VPN subnets so that the Azure resources know how to access the Meraki subnets over Auto VPN.

Additional Azure route table configuration

To create a route table, click on "New" and then "Route Table".

Next, define the “Basics” for the new route table resource.

Route Table Basics

  • Subscription: Choose the subscription that you want to be billed for from the drop-down menu.

  • Resource group: Choose an existing or a new resource group where your instances are present or will be deployed.

  • Instance Details

    • Region: Select the region where the route table will be deployed in.

    • Name: Name for the route table instance, can be anything.

    • Propagate gateway routes: Default is ‘Yes’, Select 'no', to prevent the propagation of on-premises routes to the network interfaces in associated subnets.

Once the Route Table has been created, add the VPN routes pointing to the vMX as the next hop, including the Client VPN subnet is applicable:

Please ignore the IP forwarding warning, it has already been enabled in the managed application template by default.


Finally, associate the Route Table with the Subnet where the vMX was deployed. Click on "Subnets" and then "Associate".

Choose the Virtual Network where the vMX was deployed. Then, choose the subnet used to deploy the vMX and click on 'OK.'

 

Once the subnet has been associated, enable Site to Site VPN on Dashboard.

On the Site-to-Site VPN page, add each subnet in your resource group that should be accessible to remote Auto VPN peers to the list of 'Local Network(s).' For more information on configuring Auto VPN, please refer to the Site to Site VPN settings documentation.

Troubleshooting 

The most common problem people face when deploying a vMX is getting it provisioned and online in their Meraki dashboard in the first place.  New troubleshooting/diagnosis messages have been added to the vMX console screen now so you can identify what went wrong during the provisioning process.

When the vMX boots it will execute the following steps during its initial provisioning process:

  1. Obtain user-data (vMX auth token)
  2. Authenticate with the dashboard (using auth token)
  3. Connect to Dashboard

Obtain User-Data & Authenticate to Dashboard 

Once a vMX has successfully connected to a network, it will then attempt to obtain its user-data (vMX auth token).  There are different user-data mechanisms in each platform that the vMX currently runs on to provide the token to the vMX.  In AWS, Azure, GCP and Alicloud there are user-data fields in the VM config where this can be provided. 

Token Expired 

vMX auth tokens have a lifetime of only 1 hour for security purposes.  If you see the following message on your vMX console it means the token you provided is no longer valid.  

Screen Shot 2020-09-11 at 10.45.46 AM.png

Invalid Token 

If the token provided is incorrect in any way the "invalid token" message is displayed on the console.

Screen Shot 2020-09-11 at 10.46.43 AM.png

Unable to reach Meraki Dashboard 

If the vMX is unable to reach the dashboard on TCP port 7734 then the initial provisioning phase will fail and an "Unable to reach Meraki Dashboard" message will be displayed on the console (check the firewall information page for a list of all the firewall rules needed for the Cisco Meraki cloud communication).  Please refer to this document on the correct ports/IP's that need to be opened for Meraki Dashboard communication.

Screen Shot 2020-09-11 at 10.47.32 AM.png

No "Add vMX" Button 

When navigating to Security & SD-WAN > Appliance Status, if there is no "Add vMX" button please ensure the following two conditions are met:

  1. You have available vMX licenses in your license pool
  2. You have created a "Security appliance" network type

Please note that Meraki Support does not troubleshoot AWS Cloud specific firewall rules and deployments.

  • Was this article helpful?