Quantis Appliance User Manual
Document version : 2.13
Distribution : Confidential
Date : 06.08.2020
Page: 29 / 47
5
Hot Standby
An interruption of service can lead to a catastrophic consequence. To address this problem the Quantis
appliance implements a Hot Standby feature. It uses the well-known keepalive and the VRRP protocol.
Two appliances and a common configuration are required. One appliance is active and the other one is
idle. As soon as the active appliance is not responsive anymore the idle appliance one becomes active.
The client is requesting randomness to the Quantis Appliance though a virtual IP address.
QA 1
IP 10.17.17.11
Hostname: qa-v1-1
VRRP
Virtual IP: 10.17.17.10
State: BACKUP
Priority: 100
Syslog server
IP: 10.17.17.3
Hostname: syslog-server1
Client
QA 2
IP 10.17.17.12
Hostname: qa-v1-2
VRRP
Virtual IP: 10.17.17.10
State: MASTER
Priority: 101
In this example 2 appliances share a common virtual IP address 10.17.17.10. The first appliance is
configured as BACKUP with a lower priority (100). The second appliance is configured as MASTER and
has a higher priority (101). The client sends request to the virtual IP 10.17.17.10 transparently. If the
active appliance goes down the passive appliance take over without the client notifying that. Finally, the
