ESS Design and Planning
80 Avaya Enterprise Survivable Servers (ESS) Users Guide
Multi-connected configuration using ATM PNC
In this example, the multi-connect configuration has seven Port Networks and three ESS
servers. As in the previous IP connected configuration example, the administrator wants to
design the system so the system stays as much in-tact as possible after a failover. Should IPSI
communication to the Main server(s) fail, the administrator wants ESS server 1 to provide
service to the entire system. If the IPSIs loses communication with ESS server 1, then ESS
server 2 will take over the entire system. Port Networks 6 and 7 connect to the Main server(s)
over the ATM network and do not have a direct IPSI connectivity to the Main server(s).
See Figure 29
for the customer’s multi-connected ATM PNC configuration with the priority
scoring of each ESS server:
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