Configuring a multi-appliance Router Data Center through iBGP - First Deployment
This first Data Center deployment uses two appliances with the same AS in the same subnet without access to the Core Router. It ensures network connectivity. It is complementary to "Use Case 2".
This configuration is done on the LAN panel of each appliance.
Graph legend
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Grey connection |
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SD-WAN appliance |
router |
switch |
subnet |
host in a subnet |
server |
connection between devices |
Note: A router may be a CE Router (MPLS Router), an Internet Access Router or a Core Router.
| 1 | After you have defined the interfaces of the Data Center second hub appliance (see "Router Mode"), configure its LAN. On "Use Case 4A" diagram, LAN information is displayed in blue. |
| 2 | Click the Interfaces tab. |
| • | Enter the appliance Management IP Address (11.1.4.6), Prefix Length (24). The Management IP address is used for communicating with other appliances, the ZTP Server and the Orchestrator. |
| • | Use the default Auto Generated option (creation window only) to let the system allocate LAN addresses automatically to the Routers (Router X IP = Management IP + X) linked to the WANs that you configured for this appliance. Also refer to "IP Address allocation". |
Note: Since the three IP addresses directly following the Management IP address (11.1.4.2) of the Data Center first appliance are used for its WAN routers, enter 11.1.4.6 as the Management IP Address of the second appliance.
| • | Do not activate the DHCP Relay function since the Data Center hosts can directly access the DHCP Server. The appliance does not need to relay host requests. |
| • | Do not enter any VLAN ID. Note that the grey values appearing in some fields of the interface are only given as examples and are not taken into account in the configuration. |
| 3 | Defining any subnet is unnecessary because you already defined (in the first Data Center appliance LAN) the subnet used by both hub appliances (11.1.5.0/24). Simply click the  icon at the right of the Site Name in the identification panel of the second appliance. The existing subnet is displayed: |
Also, the Next Hop address in the Subnet panel is useless because you will define the BGP Local Peer router ip address in the BGP parameter block (see below).
| 4 | Select BGP as LAN Routing Protocol, click the BGP tab and the Add peering icon  . |
The Data Center appliance exchanges its routing tables with the local router using iBGP.
| • | Enter the IP address of the BGP local peer (11.1.4.251). |
| • | Validate your settings by hitting the Create or Update buttons. |
| 5 | For high availability, define the master appliance through which traffic routing has priority over routing through the backup appliance. If you want the first appliance (DataCenter) to be the master, set its WAN1 and WAN2 Preference values to 200. To specify the second appliance as the backup appliance (DataCenter2), set its WAN1 and WAN2 Preference values to 100 (default). The highest Preference value implies priority. |
If WAN Preference values are identical, the system gives priority to the highest IP addresses. By default, Hub Preference values and Spoke Preference values are the same for a specific tunnel; if you modify any Spoke Preference value, it is automatically edited on the related Hub.
Validate your configuration.
| 6 | In the Network -> Advanced Configuration window, add the 'DataCenter2' hub appliance as Time Synchronization Server. Then click Update. |