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HA with Two-Spoke Setup with Hub, Hub Link PE, and CE Link with PE Use Case

This document focuses on configuring a High Availability (HA) network using a Two-Spoke Setup, a Hub Device, linking the Hub Device to a PE, and linking an Additional CE to the same PE. The main objective of this setup is to ensure seamless network connectivity and failover capability between the Master Node and the Additional CE.

To configure HA, refer to the HA configuration document available here.

Initial Two-Spoke Setup​

This section details the initial configuration of the two-spoke setup using four devices: the Hub Device, Spoke 1 Device, Spoke 2 Device, and Additional CE. Three of these devices (Hub Device, Spoke 1 Device, and Spoke 2 Device) reside within a single organization, with the Hub Device designated as the Hub.

  • The Hub Device will be configured as the Hub in the network.
  • Spoke 1 Device and Spoke 2 Device will be configured as Spokes and installed under the Hub Device.
  • Link Hub Spoke to PE: Establish connectivity between the Hub Device and the PE. This link provides the Hub Device with access to the external network.
  • Link Additional CE to Same PE: Connect the Additional CE to the same PE that the Hub Device is linked to. This makes the Additional CE accessible on the network via the PE.

For detailed instructions, please refer to the provided document Two-Spoke Setup with Hub, Hub Link, PE, and CE Link with PE.

Routing Configuration for Inter-CE Communication​

Once both the Hub Device and Additional CE are linked to the PE, routing must be configured to enable communication between them.

  • Configure a route to the network of the Additional CE. This route enables the Hub Device to communicate with the LAN of the Additional CE.

  • Similarly, configure a route to the Hub Device network. This allows the Additional CE to communicate with the Hub Device LAN.

Visit the routing configuration doc provided here for instructions on how to route it.

Inter-LAN Routing for Master CE and Test1-CE:​

Once the CEs are connected to their respective PEs, routing must be configured to enable communication between the LAN of the Master Node and the LAN of the Additional CE. By default, these LANs, which will have different IP subnets (e.g., Master Node LAN: 172.30.1.0 and Additional CE LAN: 192.168.1.0), will not have direct connectivity.

  1. Configure Static Routes:
    • On the Master CE, add a route to the LAN IP of Additional CE.
    • On the Additional CE, add a route to the LAN IP of the Master CE.
  2. Bridge Gateway Configuration: Additionally, a bridge gateway will be configured to facilitate connectivity between them.

For detailed instructions, please refer to the provided document Routing.

Connectivity Verification​

After completing the routing configuration, verify connectivity by following these steps:

  • Ping the LAN IP of Additional CE from Master CE.
  • Ping the LAN IP of Master CE from Additional CE.

This will confirm that both LANs can reach each other. For detailed instructions on using the ping command and troubleshooting network connectivity, please refer to the routing troubleshooting document.

Two-spoke setup failover with HA​

The HA configuration ensures that when the master node goes down, all configurations fall to the backup node, and the backup node becomes operational.

  • When the master node goes down, verify that the hub setup configured on the master node, which routes networking between the hub and additional CEs, is all working on the backup node. The backup node should not be down.

  • Once the Backup Node is up and running, verify that it maintains the same connectivity to the Additional CE that the Master Node had before. This means repeating the connectivity verification steps (pinging the LAN IP) from the Backup Node to the Additional CE.