Avaya ESS User Manual

ESS failover examples
Issue 1.1 June 2005 25
A catastrophic failure occurs on the Main servers (see Figure 2). The IPSIs in every IPSI
controlled Port Network can no longer communicate with the Main server. The no service timer
activates.
Figure 2: Catastrophic Main server failure
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.
UID
2
1
0
1
1
0
3
2
3
2
disc
COMPACT
5
4
5
4
S
i
m
p
l
e
x
D
u
p
l
e
x
ch
ch
2
1
UID
2
1
0
1
1
0
3
2
3
2
disc
COMPACT
5
4
5
4
S
i
m
p
l
e
x
D
u
p
l
e
x
ch
ch
2
1
S8710 Media Server
(Main Server)
cycmcmsf KLC 031505
disc
S8500 ESS Server
(2nd Alternative)
PN #1 PN #5
PN #2 PN #6PN #3 PN #7
PN #4 PN #8
S8700 ESS Server
(1st Alternative)
Out of Service
CSS / EI (Fiber)
ATM / ATM-EI (Fiber)
Dup Link
Port Network Control Link (EAL)
IP Connection into Control Network
Server or Network Failure
VoIP Path
DSIC LInk

Avaya ESS Specifications

General

Brand	Avaya
Model	ESS
Category	Server
Language	English