Prerequisite

1. System ( Windows or Linux)
2. Terraform setup file
3. Azure CLI
4. Access to Azure provider( Subscription)
5. Git Bash / PowerShell
6. Notepad ++ or any code Editor

Setup to execute the terraform code from git bash CLI. to create an azure express route circuit

1. Run the command terraform init for initializing the provider, Prepare your working directory for other commands
2. Run the command terraform validate to Check whether the configuration is valid
3. Run the command terraform plan Show changes required by the current configuration
4. Run the command terraform apply to Create or update infrastructure

# file name create-circute.tf
terraform {
  required_providers {
    azurerm = {
      source = "hashicorp/azurerm"
      version = "3.12.0"
    }
#Provider module and azure Authendiction  
provider "azurerm" {
  # Configuration options
    features {}
  subscription_id = "54d18623-a88e-4b6e-bcfe-a772406993b0"
  client_id       = "7e757450-7239-4c36-88f8-6664f3e49a49"
  client_secret   = "yhJ8Q~T7ycWjr4PjQ2ZUkTKgLeKTQ82YYGdiscP9"
  tenant_id       = "bc0f52a6-5a6d-45f4-8842-36ab113a5eb5"
}
#creating new RG call rg-hub-network
resource "azurerm_resource_group" "er-circute" {
  name     = "rg-hub-network"
  location = "West Europe"
}

# code to create express route circuit
resource "azurerm_express_route_circuit" "er-circute" {
  name                  = "ct-dc-azure-west-eu"
  resource_group_name   = azurerm_resource_group.er-circute.name
  location              = azurerm_resource_group.er-circute.location
  service_provider_name = "Equinix"
  peering_location      = "Silicon Valley"
  bandwidth_in_mbps     = 100

  sku {
    tier   = "Standard"
    family = "MeteredData"
  }

  tags = {
    environment = "Production"
  }
}