Avaya ESS User Manual page 25

A catastrophic failure occurs on the Main servers (see
controlled Port Network can no longer communicate with the Main server. The no service timer
activates.
Figure 2: Catastrophic Main server failure
S8500 ESS Server
(2nd Alternative)
disc
PN #1
PN #2
Port Network Control Link (EAL)
IP Connection into Control Network
Server or Network Failure
VoIP Path
DSIC LInk
cycmcmsf KLC 031505
When ESS was administered on the Main server, the S8700 ESS server received higher values
than the S8500 ESS server. The administered values of the ESS servers were advertised to the
IPSIs in the configuration. Based on the values of the ESS servers, the IPSI places the S8700
ESS server higher on its priority list then the S8500 ESS server.
S8710 Media Server
(Main Server)
PN #4
PN #3
CSS / EI (Fiber)
ATM / ATM-EI (Fiber)
Dup Link
Out of Service
Figure 2). The IPSIs in every IPSI
disc
COMPACT
1
2
UID
disc COMPACT
1
2 S8700 ESS Server
UID
(1st Alternative)
PN #5
PN #6
Issue 1.1 June 2005
ESS failover examples
PN #8
PN #7
25