Unplanned Failover To Another Ess Server; Updating The Main Server; After A Fall-Back To The Main Server - Avaya ESS User Manual

Running In ESS Mode

Unplanned failover to another ESS server

A system that failed over to a single ESS server could experience unwanted fragmentation if the
IPSI(s) can no longer communicate with the Main server, but can communicate with multiple
ESS servers. Due to a temporary network outage, one or more IPSI's can no longer
communicate with the controlling ESS server. In this situation the no service timer activates. If
the no service timer expires before the temporary network outage is restored, the IPSI will
request service from the next highest ESS server on its priority list. In the resulting
configuration, the Port Network(s), experiencing the temporary network outage, is controlled by
a different ESS server than the rest of the Port Networks.
If the failover to another ESS server causes unwanted fragmentation, the get
forced-takeover ipserver-interface command can be used to pull the Port Networks
back to the previous ESS server. For more information on the get forcd-takeover
ipserver-interface command see,
!
CAUTION:
The get forced-takeover ipserver-interface command is service
CAUTION:
effecting.

Updating the Main server

Before bringing a Main server back on-line, check the Main server's software to make sure it
matches the software version running on the ESS server(s). Verify the software version on the
ESS server's web interface. Verify the software version on the Main server. Update the software
on the Main server (if necessary).

After a fall-back to the Main server

After the Port Networks fall-back to the control of the Main server, and the ESS server no longer
controls any Port Networks, the ESS server resets. The reset system 4 is used to clear alarms
and busyouts and allow any pending translations to be loaded.
Note:
It is possible to download translations to the ESS server while it is controlling a
Note:
Port Network. The translations are received by the ESS server but are not loaded
as long as the ESS server controls a Port Network. Once the ESS server no
longer controls a Port Network, the ESS server resets and loads the new
translations.
146 Avaya Enterprise Survivable Servers (ESS) Users Guide
get forced-takeover ipserver-interface on page 152.