Vega LAN Redundancy

On Vega gateways with two LAN ports it is possible to use these ports in two different ways.

Dual Ethernet Interfaces (Default)

In this mode LAN1 and LAN2 are independent interfaces that can be configured separately. Each interface has a separate MAC address and can have DHCP, static IP and other parameters configured independently. Either port can be used independently and it is not necessary to connect both interfaces for operation. 

It is not recommended to connect both interfaces on the same subnet or routing problems may occur.

This mode is selected by setting the following:

set lan.backup_mode = 0

save

reboot system

LAN Backup Mode

The Vega can be configured to provide LAN link redundancy. This will help to preserve connectivity in the case of physical link or Ethernet switch failure. In this mode the Vega will appear to have only one logical LAN interface. All configuration is done against LAN1. The physical ports LAN1 and LAN2 share the same MAC and IP information but only one of them is active at any one time.

The LAN1 and LAN2 physical ports should be connected to the same subnet. At startup the system will choose one of the active ports to handle all Ethernet traffic. If this port fails then the system will send a gratuitous ARP and switch all traffic to the other port. The IP and MAC information will switch to this port. The traffic will stay on this port when the other link recovers. There is no concept of a preferred link, traffic switching only happens if the active link fails at the physical layer.

This mode is selected by setting the following:

set lan.backup_mode = 1

save

reboot system