Specifications

ShoreTel 9.1 Page 81
Disaster Recovery Enhancements
Introduction
ShoreTel 9 introduces Disaster Recovery Enhancements to improve system compatibility
with supported failover solutions. Disaster Recovery Enhancements implements primary
and secondary IP addresses to distinguish the Headquarters server from its backup server.
Refer to the Glossary for a definition of the following terms used in this release note:
• Distributed Routing Service (DRS)
• Failback
• Failover
Description
ShoreTel 9 Disaster Recovery Enhancements consist of the following:
• The Headquarters server specifies a primary and a secondary IP address.
— The server located at the primary IP address performs as the Headquarters server
during normal operation.
— The server located at the secondary IP address performs as the Headquarters server
during a failover.
Implementing the secondary server requires an additional Headquarters server license.
• ShoreTel system components access the server at the primary IP address during normal
conditions and the secondary server under failover conditions when requesting
services from the Headquarters server.
• The primary and secondary Headquarters server cannot be running and connected to
the network at the same time.
• Single Headquarters Server mode is supported when a secondary IP address is not
specified.
To convert a system to single Headquarters Server mode, remove the address from the
secondary IP address field, then reboot the Headquarters server.
• When the secondary IP address is specified, Citrix Servers and Window Terminal
Server must reference the Headquarters server by the DNS name.
Conditions during the Failover and Failback Operations
ShoreWare performs a failover operation when the primary server fails to transfer
Headquarters server functions to the secondary server. After the failover operation is
complete, the secondary server performs all Headquarters server functions.
The system administrator manually initiates the failback operation to restore Headquarters
server function to the primary server. After the failback is complete, the system structure
that existed before the failback operation is restored. Refer to the documentation
accompanying the failover solutions for instructions on initiating a failback operation.