Chapter 1: Ess Overview; Avaya Survivability; High-Level Ess Overview; Manual Backup Server - Avaya ESS User Manual

Chapter 1: ESS Overview

Avaya survivability

Enterprise Survivable Server (ESS) is a survivability option available with the Communication
Manger release 3.0 and later. Prior to Communication Manger 3.0, Avaya offered the following
survivability options:
Survivable Remote Processor (SRP): In a SRP option, DEFINITY server SI provides
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continued service for a single Multi-Connected CSS Port Network. The SRP option is not
available in Communication Manager 3.0 and later releases.
ATM WAN Spare Processor (WSP): In the WSP option, multiple DEFINITY server R
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processor Port Networks provide continued service for systems with ATM Port Network
connectivity.The WSP offer is not supported in Communication Manager 3.0 and later
releases.
S8300 Local Spare Processor (LSP): When communication to the Primary Controller
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(Main server) is lost, the LSP option allows the IP telephones and one or more G250,
G350, and G700 Media Gateways to register with one or more S8300 Media Servers. To
understand the difference between the LSP and ESS offers see
Manual Backup Server (MBS): The MBS option uses an S8700 or S8500 Media Server
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to backup the Main server(s). The takeover of the Port Networks by the backup server and
the recovery back to the Main server(s) are manual processes and require customer
intervention. This was an interim offer, made available until the ESS offer was released.
MBS will not be offered in Communication Manager 3.0 and later releases.

High-Level ESS Overview

The Enterprise Survivable Servers (ESS) option provides survivability to an Avaya configuration
by allowing backup servers to be placed in various locations in the customer's network. The
backup servers (ESS servers) are given administered values that are advertised to each IPSI in
the configuration. The IPSI places the ESS server on a priority list based on the administered
values. If for any reason, the IPSI can no longer communicate with the Main server, the IPSI
requests service from the next highest priority ESS server on its list. The ESS server accepts
the request and assumes control of the IPSI controlled Port Network.
Avaya survivability
LSP and ESS on page 21.
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