Unplanned Fall-Back Or Failover; Unplanned Fall-Back To The Main Server - Avaya ESS User Manual

Unplanned fall-back or failover

In some cases an unplanned fall-back to the Main server or an unplanned failover to another
ESS server is possible. It is important to understand the circumstances surrounding these
situations to prevent unwanted configurations and fragmentation.

Unplanned fall-back to the Main server

The no service timer activates when an IPSI cannot communicate with the Main server or the
controlling ESS server. The no service timer is administered on page seven of the
system-parameters ess form.
If the fall-back to the Main server was premature, the get forced-takeover
ipserver-interface command can be used to pull the Port Networks back to the control of
the previous ESS server. For more information on the get forced-takeover
ipserver-interface command see,
!
CAUTION:
The get forced-takeover ipserver-interface command is service
CAUTION:
effecting.
In an environment where there are multiple ESS servers, you can ensure that the Port
Networks, controlled by the ESS server, do not fall-back to the Main server by:
Executing the disable ess command: This command allows an ESS server or Main
●
server to be disabled (taken out of service). An ESS server or Main server may be
disabled only if it is not controlling any Port Networks. A disabled ESS server or Main
server will not connect to any IPSIs.
This command may be executed from either a Main server or an ESS server. An ESS
server may only disable its own cluster ID. When the command is run from the Main server,
any and all cluster IDs may be disabled, including the Main server itself.
For more information on the disable ess command see,
Disconnecting the control network from the Main server: By disconnecting the control
●
network the Main server cannot access the IPSIs.
!
CAUTION:
Disabling or isolating the Main server is not recommended when only there is
CAUTION:
only one ESS server in the configuration. In this case, disabling the Main server
would cause a system outage if the ESS server were to fail or if communication
between the ESS server and the Port Network(s) was lost.
get forced-takeover ipserver-interface
Unplanned fall-back or failover
on page 152.
disable ess on page 147.
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