Users Manual

https://www.peplink.com 122 Copyright @ 2019 Peplink
9.2 Misc. Settings
9.2.1 High Availability
The 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.