Throughout the MQ documentation we refer to the generic port - but we do not actually say what this is. I asked around and we came up with...
A generic port allows multiple queue managers to listen on the same IPaddress:port value. For TCP this could be
The statement 6420 TCP * SHAREPORT in SYS1.TCPPARMS(PROFxx) says on this TCP stack(LPAR), port 6420 can be used by more than one listener, so more than one queue manager.
- A Virtual IP address: (DVIPA) This is an IP address for the SYSPLEX, and TCP routes the request to one of the TCP stacks in the distribution list. So you could have an MQ listener on 6 LPARs all listening on the same IPAddress:port