ESS Design and Planning
66 Avaya Enterprise Survivable Servers (ESS) Users Guide
● The Port Network containing the CLAN reboots or fails: If the Port Network containing
the CLAN, used by the ESS server to register to the Main server, reboots or fails the
Keep-Alive messages from the ESS server to the Main server stops. The Main server
shows the status of the ESS server as unregistered in the status ess cluster
window. The ESS server attempts to re-connect to the CLAN. It the attempts fail, the ESS
server selects another CLAN from its list of CLANs.
● The Network experiences problems: If network problems prohibit communication
between the ESS server and the CLAN, the Keep-Alive messages between the ESS
server and the Main server terminates. The Main server shows the ESS server as
unregistered in the status ess cluster window. From its list of available CLANs, the
ESS server selects another CLAN and attempts to re-register with the Main server.
Network port considerations
The Main server(s), LSPs and each ESS server use specific ports across a customer’s network
for registration and translation distribution. Use the information in Tab le 1
to determine which
ports must be open in the customer’s network for Communication Manager and the ESS
functionality.
Table 1: Open ports
Port Used by: Description
20 ftp data
21 ftp
22 ssh/sftp
23 telnet server
68 DHCP
514 This port is used in
Communication Manager 1.3
to download translations.
1719 (UDP
port)
The ESS server(s) to register
to the Main server(s).
An ESS server registers with the Main
server(s) using port 1719. See CLAN
access for ESS registration on page 65
for more information on ESS server
registration.
1956 Command server - IPSI
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