Azure Routing Preference

Routing Preference Unmetered

Routing Preference Unmetered is a way in which it is available for Content Delivery Network (CDN) providers with customers hosting their origin contents in Azure. With the use of the service, CDN providers can connect directly to various Microsoft global network edge routers.

The direct connectivity is advantageous for your network traffic, leaving Azure for a CDN provider as follows:

• When traffic is routed over these direct links and leaves your Azure resources, there is no charge for data transmission.
• The efficiency is provided by having a direct connection between the origin in Azure and the CDN provider since there are no intermediate hops. The burden of the CDN, which often fetches data from the origin, benefits from this.

Configuring Routing Preference Unmetered

Your CDN providers must participate in this program for you to benefit from Routing Preference unmetered. Contact your CDN provider if it is not a participant in the program.

Now, set the Routing Preference type to the Internet when configuring routing preferences. When generating a public IP address, you may choose the Routing Preference and then link the public IP to resources like virtual machines, and internet-facing load balancers. There are three types in which routing preferences can be configured:-

Configure routing preference for a public IP address using the Azure portal

The following Azure resources can be linked to the public IP address for both incoming and outgoing internet traffic:

• Virtual machine.
• A virtual machine scale set
• Azure Kubernetes Service (AKS)
• Internet-facing load balancer
• Application Gateway
• Azure Firewall.

                                                                                         Source: Public Ip Address

For all Azure services, the Microsoft global network is the default setting for the public IP address routing preference. Any Azure service can be connected to this setting.

Create a public IP address with a routing preference

1. Sign in to the Azure portal at LoginIn.
2. Select Create a resource.
3. Enter the Public IP address in the search field.
4. Select the Public IP address from the search results. Select Create in the Public IP address page.
5. Choose Standard for SKU.
6. Choose Internet as your preferred routing method.
   
   Source: Azure 
7. Enter the following information in the IPv4 IP Address Configuration section.
   
8. Select Create.

You may use the previously configured public IP address with either a Windows or Linux virtual machine. A virtual machine must be associated with a public IP address in order for the public IP to be associated with your VM, you may also link the public IP address you defined above with an Azure Load Balancer By designating it to the load balancer frontend settings.

Configure routing preference for a public IP address using Azure PowerShell

In this, we have a look at how we can Azure PowerShell to set the routing preference via ISP network for a public IP address. The following Azure resources can be linked to the public IP address for both incoming and outgoing internet traffic:

• Virtual machine.
• Virtual machine scale set.
• Azure Kubernetes Service (AKS).
• Internet-facing load balancer.
• Azure Firewall.
• Application Gateway

The default setting for the public IP address routing preference for all Azure services is the Microsoft global network, and any Azure service can be connected to this setting.

Use Azure Cloud Shell

Azure hosts a browser-based interactive shell environment called Azure Cloud Shell. To start Azure Cloud Shell: 

Options                                                                                                                                             Example

Select Try It in the upper-right corner of a code block. Selecting                        Try It doesn't automatically copy the code to Cloud Shell.

Go to https://shell.azure.com, or select the Launch Cloud Shell . button to open Cloud Shell in your browser.

Select the Cloud Shell button on the menu bar at theupperright in the Azure portal.

This code is run in Azure Cloud Shell:

• Run the following code in Azure Cloud Shell to execute it:
• Get Cloud Shell going.
• To copy the code on a code block, click the Copy button.
• On Windows, Linux, and macOS, press Ctrl+Shift+V to paste the code into the Cloud Shell session. On Windows and Linux, press Cmd+Shift+V.
• To execute the code, press Enter.

Create a Resource Group

Use New-AzResourceGroup to create a resource group. In the east us location, this example establishes a resource group called myResourceGroup:

$rg = New-AzResourceGroup -Name myResourceGroup -Location EastUS

Create a Public IP with Internet routing preference

$iptagtype="RoutingPreference"
$tagName = "Internet"
$ipTag = New-AzPublicIpTag -IpTagType $iptagtype -Tag $tagName 
# attach the tag
$publicIp = New-AzPublicIpAddress `
-Name "MyPublicIP" `
-ResourceGroupName $rg.ResourceGroupName `
-Location $rg.Location `
-IpTag $ipTag `
-AllocationMethod Static `
-Sku Standard `
-IpAddressVersion IPv4

Clean up resources

You can eliminate the resource group, the VM, and all associated resources so that they are no longer required by using the Remove-AzResourceGroup command.

Remove-AzResourceGroup -Name myResourceGroup.

Frequently Asked Questions

What do you understand by routing?

Routing is the process of finding a path for traffic inside a network or between or across many networks. Routing occurs in many different types of networks, including circuit-switched networks like the public switched telephone network (PSTN) and computer networks like the Internet.

What is the difference between Hot potato Routing and Cold Potato Routing?

In hot-potato routing, an ISP sends traffic to a downstream ISP as soon as possible. Cold-potato routing is the inverse of hot-potato routing, in which an ISP transports traffic as far as feasible on its own network before passing it on to a downstream ISP. These two policies reflect the ISP's varied goals.

What are Egress traffic and Ingress Traffic?

when traffic passes on the Microsoft worldwide network and departs at the nearest exits to the user. It is called Egress Traffic. But when the traffic entering the Microsoft network closest to the user is due to the worldwide BGP Anycast notification. It is called Ingress traffic.

Conclusion 

In this blog, we first talked about the Introduction of Routing Preferences, Routing via Microsoft and Public Internet, and cost, Routing Preferences unmetered. At last, we see how to configure Routing preferences.

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