ESS failover examples
Issue 1.1 June 2005 53
Figure 20: ATM, single ESS server, multiple nodes in normal operation
A network outage occurs that fragments the two ATM and IP networks (see Figure 21). The
Main server continues to provide service to Port Networks 1 through 3 with no service
interruption. The IPSIs in Port Network 4 and 6 requests service of the S8700 ESS server after
the no service timer expires. The S8700 ESS server assumes control of Port Network 4 first.
ATM ATM
UID
2
1
0
1
1
0
3
2
3
2
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COMPACT
5
4
5
4
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2
1
UID
2
1
0
1
1
0
3
2
3
2
disc
COMPACT
5
4
5
4
S
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m
p
l
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1
S8710 Media Server
(Main Server)
PN #1
PN #2
PN #3
PN #6
PN #5
PN #4
S8700 ESS Server
(1st Alternative)
cycmatm3 KLC 031505
PN #2 does not
have an IPSI
PN #5 does not
have an IPSI
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
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