During the design and planning phase of a survivable core server implementation, it is important to understand the goal of the customer for survivability, including prioritization. This is done by determining the strategy of Survivable core server support for the Media gateways in the system. Goals for deploying and administering the survivable core servers are:
Avoiding fragmentation of the system: The survivable core server controls as much of the system as possible.
Avoiding overload of network resources with excessive call traffic: Each survivable core server controls only limited portions of the system. Multiple survivable core servers may be needed to support the number of Media gateways. In this way, a survivable core server can potentially assume control of a single Media gateways or a group of Media gateways while the WAN traffic is unaffected or even reduced.
During the initial design and whenever additional capacity is added, the priorities listed above should be taken into account. Once a plan is developed to allow a survivable core server to take control of all or part of the configuration, priority parameters are administered for the survivable core server implementing the strategy.
After an overall strategy is selected, determine the placement of the survivable core servers in the network. Determine the administered values and communities for each survivable core server. For more information about administered values and communities, see Survivable core server administration.
