ESS failover examples
Issue 1.1 June 2005 45
A network outage occurs that stops communication from the Main server to Port Networks 4
through 6 (see Figure 16
). The Main server continues to provide service to Port Networks 1
through 3. The no service timer activates for Port Networks 4 and 6. After the no service timer
expires, the IPSI in Port Network 4 and Port Network 6 request, and receive service from the
S8700 ESS server. The ESS server cannot take control of the CSS node in Port Network 4. The
CSS node in Port Network 4 is not utilized. Port Network 5 is also not utilized as it does not have
an IPSI and can no longer communicate with the CSS node in Port Network 4. Port Networks 1,
2, and 3, are not affected by the outage.
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