Avaya ESS User Manual page 20

ESS Overview
As part of a failover, the ESS resets the Port Networks that it now controls. The Port Network
preforms a restart. During a restart:
Every call is dropped
●
Administrative sessions are dropped
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Every application and system link is dropped and re-established
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Non-translation feature data, such as Automatic Wakeup calls, are lost and must be
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re-entered.
Every login, including remote access and system port logins, is dropped
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Every hardware component is reset except:
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- Active TN2312 IPSI in any Port Network.
- Active EI in a non-IPSI connected PN
- SNIs.
- SNCs.
- DS1 clocks.
Every busied-out MO is released and can be re-busied.
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Circuit packs are re-initialized and translations are verified.
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For a critical-reliability system (duplicated PNC), a global refresh of the standby PNC is
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performed after the reset.
Depending on the type of failure and how the ESS servers are configured, an individual ESS
server may accept control of all Port Networks, several Port Networks, a single Port Network, or
no Port Networks. When a LAN or WAN failure occurs in configurations where Port Networks
are widely dispersed, multiple ESS servers may be required to collectively accept control with
each ESS server controlling some portion of the set of Port Networks.
When an ESS server accepts control, it communicates directly with each MCC1, CMC1, SCC1,
G600, or G650 Media Gateway through the gateway's IPSI board. The ESS server can also
control non-IPSI controlled Port Networks through an ATM Expansion Interface board. The ESS
server communicates indirectly with each G250, G350, or G700 Media Gateway through CLAN
connections in the Port Networks.
Once the issue that caused the failover is resolved, it is possible to resume control of IPSI Port
Networks back to the Main server(s). The Main server(s) can resume control of Port Networks:
All at once:
●
- Auto Return: The Auto Return functionality allows the scheduling of a day and a time
for the return of all IPSI Port Networks to the control of the Main server(s). This option is
administered on the Main server(s) up to seven days before the requested fall-back
occurs. See
- get forced-takeover ipserver-interface all : The get
forced-takeover ipserver-interface SAT command with the all parameter
provides the capability for an ESS server or Main server(s) to manually take control of all
20 Avaya Enterprise Survivable Servers (ESS) Users Guide
Administering ESS on page 122 for more information.