C-LAN access for survivable core server registration

Last Updated : Aug 05, 2013 |
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During the survivable core server configuration, an IP address of a C-LAN is used. The survivable core server uses this configured C-LAN IP address during the initial registration with the main server.
Plan carefully when using a C-LAN in a survivable core server configuration. The C-LAN should be local to the survivable core server or of high availability to the survivable core server. During the initial registration to the main server, the survivable core server does not contain translations and therefore has no knowledge of other C-LAN circuit packs in the configuration. If the survivable core server cannot communicate with the configured C-LAN circuit pack it will be unable to register with the main server.
When a survivable core server registers with the main server through the C-LAN, the main server validates the survivable core server Module ID, System ID, platform type, and IP address with that of the administered values. Only the active server of a duplicated server pair registers with the main server. Once registered, the survivable core server uses the same C-LAN connection it used to register to send Keep-Alive messages to the main server.
Important:
The C-LAN must be set to allow H.323 endpoints on the IP Interfaces screen for a survivable core server to register to the main server.
The survivable core server re-registers with the main server when:
  • Translations are received from the main server: The survivable core server performs a reset after receiving translations from the main server. During the reset the survivable core server stops sending Keep-Alive messages.
    Once translations are loaded on the survivable core server, the survivable core server re-registers with the main server. The survivable core server attempts to use the C-LAN in its configuration for the registration process.
    If a C-LAN is used in the configuration and communication with the configured C-LAN is not available, the survivable core server selects a C-LAN from its list of available C-LANs. The survivable core server re-registers to the main server through the available C-LAN and, after registration, uses the C-LAN to send Keep-Alive messages to the main server.
    Note:
    If a survivable core server is still registered with the main server while controlling port networks, the survivable core server can receive translation downloads from the main server. In this case, the survivable core server accepts the translation download but does not reset until it no longer controls a port network.
  • The C-LAN reboots or fails: If the C-LAN that the survivable core server used to register to the main server reboots or fails, the Keep-Alive messages from the survivable core server to the main server stops. The main server shows the status of the survivable core server as unregistered in the ESS Cluster Information screen. The survivable core server attempts to communicate with the lost C-LAN. If attempts to communicate with the lost C-LAN fails, the survivable core server selects another C-LAN from its list of C-LANs.
  • The port network containing the C-LAN reboots or fails: If the port network containing the C-LAN that is used by the survivable core server to register to the main server reboots or fails, the Keep-Alive messages from the survivable core server to the main server stops. The main server shows the status of the survivable core server as unregistered in the ESS Cluster Information screen. The survivable core server attempts to re-connect to the C-LAN. It the attempts fail, the survivable core server selects another C-LAN from its list of C-LANs.
  • The Network experiences problems: If network problems prohibit communication between the survivable core server and the C-LAN, the Keep-Alive messages between the survivable core server and the main server terminates. The main server shows the survivable core server as unregistered in the ESS Cluster Information screen. If multiple C-LANs are used in this configuration, the survivable core server selects another C-LAN from its list and attempts to re-register with the main server using the new C-LAN.