PePLink Balance Series v4.0 User Manual
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15
Miscellaneous Settings
(This section applies only to PePLink Balance 200, 300, 380 and 700.)
The miscellaneous settings include configuration for high availability, quality of service, time
server, SNMP, email notification, and remote system log.
15.1
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 (i.e. a pair of PePLink
Balance 200 units, or a pair of PePLink Balance 300 units) provide redundancy and failover
in a master-slave arrangement. From a high level, in the event that the Master Unit is
down, the Slave Unit becomes active.
The following diagram illustrates an HA configuration with two PePLink Balance 200 units,
and two Internet connections:
In the diagram, the WAN ports on each PePLink Balance unit connect to the router and
modem; and PePLink Balance unit connects to the same LAN switch via a LAN port.
An elaboration on the technical details of the implementation, by PePLink Balance, of Virtual
Router Redundancy Protocol (VRRP, RFC 3768) 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