ESS design strategy
Issue 1.1 June 2005 63
Chapter 2: ESS Design and Planning
ESS design strategy
During the design and planning phase of an ESS implementation, it is important to understand
the customer goals for survivability, including prioritization. This is done by determining the
strategy of ESS support for the Port Networks in the system. Goals for deploying and
administering the ESS servers are:
1. Avoiding fragmentation of the system: The ESS server controls as much of the system
as possible.
2. Avoiding overload of network resources with excessive call traffic: Each ESS server
controls only limited portions of the system. Multiple ESS servers may be needed to support
the number of Port Networks. In this way, an ESS server can potentially assume control of a
single Port Network or group of Port Networks while the WAN traffic is unaffected or even
reduced.
During initial design, and whenever additional capacity is added, these priorities should be
taken into account. Once a plan is developed to allow an ESS server to take control of a
configuration, or parts of a configuration, priority parameters are administered implementing the
strategy.
After an overall strategy is selected, determine the placement of the ESS servers in the
network. Determine the administered values and communities for each ESS server. For further
details on administered values and communities see, Administering ESS server on the Main
server on page 122.
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