ESS Design and Planning
74 Avaya Enterprise Survivable Servers (ESS) Users Guide
For information on how to administer an ESS server see, Administering ESS server on the Main
server on page 122.
Advertising priority to an IPSI
An ESS server advertises its priority to an IPSI:
● Every time it disconnects and reconnects to the Main server, such as resets after the ESS
server receives translations from the Main server, network outages, etc.
● When its priority changes
● At periodic intervals if rejected by the IPSI
Changes to a priority list
The IPSI priority list is dynamic and may change when:
● Communication is lost between an ESS server and the IPSI: The ESS server resets
after receiving translations from the Main server. When the ESS server resets,
communication between the ESS server and the IPSI is lost. The IPSI adjusts its priority
list, removing the ESS server from the list. When the ESS server re-establishes
communication with the IPSI, the ESS server will regain its proper order on the list.
● An ESS server is deleted: The ESS server was removed from translations.
No preference server The value of an ESS server administered with no
preference is based solely on its priority value.
It is possible to administer all ESS servers with no
preferences. In this case, all ESS servers would start out
with the same value and a priority value would be used to
rank the importance of the ESS servers independent of
communities.
Table 2: ESS relative priority (continued)
Administered ESS server
type
Priority value impact
2 of 2
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