Digi TX54 User Manual page 381

Routing
5. Click to expand VRRP+.
6. Click Enable.
7. Add interfaces to monitor:
a. Click to expand Monitor interfaces.
b. Click  to add an interface for monitoring.
c. For Interface, select the local interface to monitor. Generally, this will be a cellular or WAN
interface.
d. (Optional) Click  again to add additional interfaces.
8. (Optional) For backup devices, click to enable Monitor VRRP+ master.
This parameter allows a backup VRRP device to monitor the master device, and increase its
priority when the master device is failing SureLink tests. This can allow a device functioning as
a backup device to promote itself to master.
9. For Priority modifier, type or select the amount that the device's priority should be decreased
due to SureLink connectivity failure, and increased when SureLink succeeds again.
Along with the priority settings for devices in this VRRP pool, the amount entered here should
be large enough to automatically demote a master device when SureLink connectivity fails. For
example, if the VRRP master device has a priority of 100 and the backup device has a priority
of 80, then the Priority modifier should be set to an amount greater than 20 so that if
SureLink fails on the master, it will lower its priority to below 80, and the backup device will
assume the master role.
10. Configure the VRRP interface. The VRRP interface is defined in the Interface parameter of the
VRRP configuration, and generally should be a LAN interface:
TX54 User Guide
Virtual Router Redundancy Protocol (VRRP)
381