Survivability solutions

Enterprise survivable servers (ESS)

Note:

See Using the Avaya Enterprise Survivable Servers (ESS), 03-300428, for additional information about ESS.

The Enterprise Survivable Server (ESS) is a survivability option for S8700-series and S8500/ S8500(B) systems and is available with the Communication Manger release 3.0 and later. 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 request 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.

The IPSI request for ESS service will happen after an administered “No-Service” timer expires. The value of the No-service timer determines the amount of time the IPSI will wait to request service from an ESS server, after losing communication with the Main server or the controlling ESS server. The value for the No-service timer is administrable from three to 15 minutes.

During No-Service timer interval stable calls remain up in the same state as they were before the outage occurred. The stable calls do not have access to any features such as hold, conference, etc. After the No-Service timer expires, shuffled IP to IP calls will stay up, but calls on DCP or analog phones will terminate.

When service to main is restored, the IPSI(s) will return to the control of the main server in the manner administered by the customer, which can be either manually or according to a scheduled time.

In an ESS environment, there is one Main server. The Main server can be a S8500 (B) simplex server or a pair of S8700-series servers. If the Main server is an S8500 Server, all ESS servers in the configuration must also be S8500 Servers.

ESS provides a survivability option for port networks of the following platforms:

S8700-series fiber-PNC with ATM port network connectivity

S8700-series fiber-PNC with CSS port network connectivity

S8700-series/S8500(B) IP-PNC systems

System with combination of fiber-PNC and IP-PNC

Through careful planning and consideration, S8700-series and/or S8500 Servers are placed in various locations in the customer’s network. Each ESS server is administered on the Main server. The IPSIs in the configuration contain a list (called a priority list) of ESS servers. The Main server is always the highest ranking server on an IPSI’s priority list.

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Avaya 555-245-600 manual Enterprise survivable servers ESS