VMS will configure all cluster communication adaptors and determine which
is best for it's use. If you wish to disable cluster communications across
a particular circuit then you may use the programs in SYS$EXAMPLES:
LAVC$STOP_BUS and LAVC$START_BUS to control this. Also if you have access
to DSNlink you can reference the article
[OpenVMS] A Discussion of How VMScluster Members Communicate