Users Manual

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13.14 Misc.Settings 
13.14.1 High Availability 
Peplink Balance supports high availability (HA) configurations via an open standard virtual router
redundancy protocol (VRRP, RFC 3768).
In an HA configuration, two same-model Peplink Balance units provide redundancy and failover in a master-
slave arrangement. In the event that the master unit is down, the slave unit becomes active.
High availability will be disabled automatically where there is a drop-in connection configured on a LAN
bypass port.
The following diagram illustrates an HA configuration with two Peplink Balance units and two Internet
connections:
In the diagram, the WAN ports of each Peplink Balance unit connect to the router and to the modem. Both
Peplink Balance units connect to the same LAN switch via a LAN port.
An elaboration on the technical details of the implementation of virtual router redundancy protocol (VRRP,
RFC 3768) by the Balance follows:
● In an HA configuration, the two Peplink Balance units communicate with each other using VRRP
over the LAN.
● The two Peplink Balance units broadcast heartbeat signals to the LAN at a frequency of one
heartbeat signal per second.
● In the event that no heartbeat signal from the master Peplink Balance unit is received in 3 seconds
(or longer) since the last heartbeat signal, the slave Peplink Balance unit becomes active.
● The slave Peplink Balance unit initiates the WAN connections and binds to a previously configured
LAN IP address.
● At a subsequent point when the master Peplink Balance unit recovers, it will once again become
active.
You can configure high availability at Network>Misc. Settings>High Availability.