Avaya ESS User Manual page 82

ESS Design and Planning
See Table 5 for an example data collection worksheet for
.
Table 5: Multi-Connected using ATM PNC data collection sheet
Server
Preference
System
Preferred
Local
Preferred
No
Preference
Local Only
In this example all IPSIs have the same priority lists. There are no IPSIs in PN6 and PN7 and
therefore no priority list associated with those Port Networks.
In the case of an IP Network failure, if PN6 and PN7 cannot communicate with the Main
server(s), they will fall under control of one of the other ESS servers. In order for an ESS server
to control a Port Network without an IPSI, such as PN6 or PN7, the ESS server must first control
a Port Network with an IPSI. Once the ESS server controls an Port Network with an IPSI the
ESS server may then attempt to communicate with, and possibly control, a non-IPSI Port
Network through the ATM network. An ESS server is always more likely to take control of a
non-IPSI Port Network if it is providing service to an IPSI in that community.
82 Avaya Enterprise Survivable Servers (ESS) Users Guide
2 S8700 1 192.9.13.10
2
192.9.13.11
3 S8500 3 192.9.44.11
4 S8500 4 192.9.33.22
Figure 29
100 1 1
2
3
50 1
2
1
2
3