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Auto-Discovery

'Auto-Discovery' permits each enabled Prognosis Server to view all other servers on the network. This feature is turned off by default, however it can be turned on through the NETWORK Configuration by commenting out the MULT-IF-ADDR (NONE) statement (i.e. insert a hyphen '!' in front of the statement) on each required server.

SUBSYS NETWORK
...
! MULT-IF-ADDR (NONE)
...

The diagram above shows a group of servers linked using 'Auto-Discovery' where each server can 'see' every other server in the network. The arrows indicate the direction of data flow.

With 'Auto-Discovery' enabled, where the underlying topology supports multicast (a 'one to many' method of communicating), The Prognosis Servers connect to all other servers in a fully meshed manner. Enabling 'Auto-Discovery' also enables HPE NonStop servers to Auto-Discover other HPE NonStop servers via EXPAND and connect to all in a fully meshed manner.

For small numbers of servers (less than 20) this is often the simplest way of configuring the network topology. To connect machines in different collision domains (e.g. where the underlying network does not have multicast routing), or to span firewalls, the NETWORK Configuration needs to be modified on each server to specify the connections to other servers and the direction of data on those connections.

With Auto-Discovery enabled, but where the underlying topology does not support multicast beyond the local subnet, the NETWORK Configuration needs to be modified by adding SUBNET-JOIN statements to include any nodes that are external to the subnet.

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