Clustering Considerations
-------------------------

The cluster contains multiple nodes which can be contained in separate firewalled networks.  

Network ports need to be opened on firewalls to allow inter-node communication – these are
described in more detail in the Platform Guide.

All communication between nodes is encrypted.

+-----------+---------------------------------------------------------------------------------------------------+
| Node type | Ports                                                                                             |
+===========+===================================================================================================+
| WebProxy  | 22 (ssh & sftp), 80 (http), 161 & 162 (snmp), 443 & 8443 (https)                                  |
+-----------+---------------------------------------------------------------------------------------------------+
| Unified   | 22 (ssh & sftp), 80 (http), 161 & 162 (snmp), 443 & 8443 (https), 27019, 27020 & 27030 (database) |
+-----------+---------------------------------------------------------------------------------------------------+


* 22/ssh is used for remote administration
* 80 and 443 is used for the web server
* 161 and 162 are used for sending and receiving snmp
* 8443 is used for inter-cluster communication
* 27019, 27020 and 27030 is used for database queries and replication

.. |VOSS-4-UC| replace:: VOSS-4-UC
.. |Unified CM| replace:: Unified CM