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+# Quick Start
+
+This is a conceptual Demo Scenario that will help you to bring highly available and secured connectivity with dynamic routing between Cloud and On-Prem using regular Internet circuits.
+
+>Key idea of this scenario based on limitations coming from On-Prem side which as two Internet circuits (Main and Backup where Backup is the `Radio Bridge`)
+
+The materials from this repository will help you quickly build from the scratch the following network topology:
+
+[Target Topology](img/topology.svg)
+
+To prepare your admin workstation (desktop, laptop or maybe something else) follow these steps:
+
+1. Prepare your VK Cloud project (enable CLI and API access): [URL](https://cloud.vk.com/docs/en/tools-for-using-services/api/rest-api/enable-api)
+2. Create and upload your SSH key into the cloud admin account: [URL](https://cloud.vk.com/docs/tools-for-using-services/vk-cloud-account/instructions/account-manage/keypairs#importing_existing_key)
+3. Install Terraform components depending on your OS: [URL](https://cloud.vk.com/docs/en/tools-for-using-services/terraform/quick-start)
+4. Install Ansible components depending on your OS: [URL](https://docs.ansible.com/projects/ansible/latest/installation_guide/intro_installation.html#pipx-install)
+5. Install GIT components and copy this repo onto your admin workstation
+
+Additional Steps:
+
+- Use you private SSH key within Terraform and Ansible
+- Use proper account credentials within Terraform
+
+# Under the Hood
+
+>Main part of thies scenario related to the routers (a pair of IaaS Virtual Machines (`IaaS Routers`) converted into traditional routers with advanced functionoality)
+
+**Terraform**
+
+Provisions a pair of `IaaS Routers` with internal and external ports. Includes supplimentary Shell script (which is a part of Terraform manifest) to maintain configuration across reboots.
+
+**Ansible**
+
+Configure `IaaS Routers` using role-based playbooks controlled via the [Inventory File](ansible/inventory.ini)
+
+**Additional Software Used:**
+
+- strongSwan (to manage IPsec)
+- FRR (to manage BGP)
+- Keepalived (VRRP)
+
+[Private and Public Ports](img/ports.svg)
+
+Each IaaS Router will use two secured connections to On-Prem environment through the Internet:
+
+- IPsec Site-to-Site in Transport Mode (to protect GRE Tunnels)
+- GRE Tunnel (to transfer a data)
+
+[Secured Connections](img/connections.svg)
+
+GRE Tunnels topology clearly ecxplained in the following diagram:
+
+[GRE Tunnels](img/tunnels.svg)
+
+**High Availability Design**
+
+BGP peering eliminates single points of failure on the Cloud side through:
+
+- Bidirectional eBGP sessions from each `IaaS Router` to On-Premises
+- Optimized route metrics reflecting circuit priority (Primary/Backup)
+- Automatic failover during circuit failures (including Cloud Availability Zone failures)
+- Asymmetric routing prevention via MED and Local Preference configuration
+
+[BGP Peering](img/bgp.svg)
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+
+
+
+
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+
+
+
+
Router
Infra
Router2
Router1
BGP
GRE I1R1
IPsec I1R1
BGP
GRE I2R1
IPsec I2R1
BGP
GRE I2R2
IPsec I2R2
BGP
GRE I1R2
IPsec I1R2
Internet
ISP-1
ISP-2
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+
+
+
+
Priv-SRV-01
Priv-SRV-02
Priv-SRV-03
Router2
Router1
VRRP
M
B
Private Network Port
Public Network Port
Internet
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+
+
+
+
VK Cloud
Зона доступности ME1
Зона доступности MS1
Priv-SRV-01
Priv-SRV-02
Priv-SRV-03
Router2
Router1
Приватная сеть в Облаке
Приватная подсеть в Облаке
Сети Облака с подключением к Internet
Инфраструктура
клиента
Сети в инфраструктуре клиента
Infra-SRV-01
Infra-SRV-02
Infra-SRV-03
Router
Infra
Internet
ISP-1
ISP-2
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+
+
+
+